CN111075402A

CN111075402A - Non-beam hydraulic pumping unit

Info

Publication number: CN111075402A
Application number: CN201911356943.7A
Authority: CN
Inventors: 赵磊; 于洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-04-28

Abstract

The invention discloses a non-beam hydraulic pumping unit, and relates to the technical field of chemical equipment. The top of the frame is connected with a crown block; the first traction rope penetrates through the crown block and is connected with the power-assisted assembly and the oil well polished rod; the boosting assembly is transversely arranged and is adjacent to the rack, and the boosting assembly is used for pulling the polish rod of the oil well; the second traction rope penetrates through the crown block and is connected with the weight box and the oil well polish rod; the weight box can move along the rack in the vertical direction. The embodiment can reduce energy consumption and improve mechanical efficiency; the load, the stroke and the stroke frequency of the non-beam hydraulic pumping unit can be conveniently adjusted, so that the stroke is maximized; easy to install and maintain; the application range is wide; and the safety is better.

Description

Non-beam hydraulic pumping unit

Technical Field

The invention relates to the technical field of chemical equipment, in particular to a non-beam hydraulic pumping unit.

Background

The pumping unit is a kind of mechanical equipment for exploiting petroleum, and is the most main lifting equipment in the rod pumping system. According to whether there is a walking beam, it can be divided into a walking beam type pumping unit and a non-walking beam type pumping unit.

The existing pumping unit generally utilizes rotary speed change and is additionally provided with a balance iron balance weight to realize reciprocating motion, and the pumping unit has the defects of high energy consumption, environmental pollution and high-power distribution system, and must be provided with a high-voltage power supply and a transformer to realize power supply support. The machine type is inconvenient to install, needs a heavy truck to transport and configure a crane, and needs to be prefabricated and constructed in advance for civil engineering. The machine model is installed on a higher prefabricated base platform, the bottom feet of the equipment are fixed by long rod bolts, and the pumping unit is overturned and damaged to cause serious production accidents under the conditions of underground condition mutation and broken rod of the pumping rod. An operator can operate the engine after multiple persons are simultaneously matched during starting and stopping, and serious accidents are easy to happen due to poor matching. The model also has harm to other people and livestock groups around.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a non-beam hydraulic pumping unit which can reduce energy consumption and is high; the installation and maintenance are convenient; the application range is wide; and the safety is better.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a no beam-pumping unit of walking beam formula hydraulic pressure, includes frame, overhead traveling crane, weight box, helping hand subassembly, first haulage rope and second haulage rope, wherein:

the top of the frame is connected with the crown block;

the first traction rope penetrates through the overhead traveling crane and is connected with the power-assisted assembly and the oil well polished rod;

the power-assisted assembly is arranged adjacent to the rack and used for pulling the polish rod of the oil well upwards;

the second traction rope penetrates through the overhead crane and is connected with the weight box and the oil well polish rod;

the weight box is movable in a vertical direction along the frame.

Optionally, the overhead traveling crane includes support frame, first pulley, second pulley, third pulley and pulley block, wherein:

the first pulley is connected with the supporting frame through the pulley seat, and the first pulley is positioned on one side of the supporting frame, which is close to the power-assisted assembly;

the second pulley is connected with the supporting frame through the pulley seat and is positioned above the weight box;

the third pulley is connected with the support frame through the pulley seat, and the third pulley is positioned on one side of the support frame close to the polish rod of the oil well;

the first traction rope is sequentially wound on the upper parts of the first pulley and the third pulley;

and the second traction rope is sequentially wound on the upper parts of the second pulley and the third pulley.

Optionally, the crown block further comprises a roller, wherein:

the peripheral surface of the rolling shaft is provided with a rope groove which is used for being matched with the first traction rope and/or the second traction rope;

the upper part of the supporting frame is connected with at least one rolling shaft, and the rolling shaft is positioned above the first pulley and the third pulley and/or above the second pulley and the third pulley;

the first traction rope is sequentially wound on the upper parts of the first pulley, the rolling shaft and the third pulley; and/or

And the second traction rope is sequentially wound on the second pulley, the rolling shaft and the upper part of the third pulley.

Optionally, still include hydraulic cylinder, base, support, electrical system and safety barrier, the frame includes that at least one section sets up the steel construction into hexahedron frame, wherein:

the connected steel structures are movably or fixedly connected, a fixed channel is arranged in each steel structure, and the weight box can move up and down in the fixed channel;

one side of the lower end of the steel structure at the lowest end is hinged with the base, and the other side of the lower end is movably connected with the base;

two ends of the lifting hydraulic cylinder are respectively hinged with the steel structure and the base in the middle;

the bracket is arranged at the edge of the base and is used for supporting the rack when the rack is laterally overturned;

the electric control system is arranged on the base and is used for controlling the power-assisted assembly and the lifting hydraulic cylinder and providing power supply and protection;

the safety barrier is located at the edge of the base.

Optionally, the helping hand subassembly includes master cylinder, fixing base, sliding seat, fixed pulley group, running pulley group, track and wedge-shaped joint, wherein:

the track and the fixed seat are respectively connected with the base; the end part of the track is connected with the fixed seat;

the movable seat supports the movable pulley block and is in sliding fit with the track;

the fixed seat supports the fixed pulley block;

the main hydraulic cylinder is arranged between the fixed seat and the movable seat;

the wedge-shaped joint is hinged to the side face of the fixed seat and used for fixing one end of the first traction rope.

Optionally, the power assisting assembly further comprises a first bearing, a cushion block, an auxiliary hydraulic cylinder, a second bearing and a reversing device, the rail is a channel steel, wherein:

the end part of the movable seat is connected with the first bearing which is longitudinally arranged and the second bearing which is transversely arranged; the first bearing is in sliding fit with the inner top surface and/or the inner bottom surface of the track; the second bearing is in sliding fit with the inner side face of the rail;

the auxiliary hydraulic cylinder is arranged between the fixed seat and the movable seat;

the cushion block is movably arranged between the piston rod of the auxiliary hydraulic cylinder and the movable seat;

and the two limit switches of the reversing device are respectively arranged on the track.

Optionally, a wedge joint is disposed on a side surface of the fixed seat, the fixed pulley block includes at least two fixed pulleys, the movable pulley block includes at least two movable pulleys, and the crown block is provided with one of the first pulley, at least one of the second pulley and at least two of the third pulleys, wherein:

one end of the first traction rope is connected to the wedge-shaped joint; the rope body of the first traction rope is sequentially wound from the position close to the wedge-shaped joint to the upper part of the movable pulley and the lower part of the fixed pulley far away from the wedge-shaped joint and wound on the upper parts of the first pulley and one of the third pulleys; the other end of the first traction rope is connected to the oil well polish rod;

one end of the second traction rope is connected to the weight box; the rope body of the second traction rope is sequentially wound on the second pulley and the upper part of the other third pulley; the other end of the second traction rope is connected to the oil well polish rod; or

The middle part of the second traction rope is connected with the weight box; rope bodies on two sides of the second traction rope are respectively and sequentially wound on the upper parts of the two second pulleys and the other two third pulleys; and two ends of the second traction rope are connected to the oil well polish rod.

Optionally, both sides of fixing base are provided with respectively wedge joint, the fixed pulley group includes two at least fixed pulleys, the movable pulley group includes two at least movable pulleys, the overhead traveling crane is provided with two first pulley, at least one second pulley and at least three the third pulley, wherein:

the middle part of the first traction rope is connected with an oil well polish rod; rope bodies on two sides of the first traction rope are respectively and sequentially wound on the upper parts of two third pulleys and the first pulley, and are respectively and sequentially wound from the middle part of the power-assisted assembly to the upper part of the movable pulley close to the wedge-shaped joint and the lower part of the fixed pulley; two ends of the first traction rope are respectively connected with the two wedge-shaped joints;

Optionally, the top of weight box is provided with parallel lug and round pin axle, wherein:

the lifting lug is connected to the top of the weight box;

the two ends of the pin shaft are connected with the lifting lugs; or the pin shaft penetrates through the two lifting lugs;

the second traction rope is connected to the pin shaft.

Optionally, the top of the weight box is provided with parallel lifting lugs and connecting wheels, wherein:

the lifting lug is connected to the top of the weight box;

the connecting wheel is connected between the two lifting lugs;

the second traction rope is passed around from the underside of the fifth wheel.

One embodiment of the above invention has the following advantages or benefits:

1. the walking-beam-free hydraulic pumping unit converts mechanical energy into hydraulic energy in a hydraulic conduction mode, and utilizes the advantage of larger thrust of the hydraulic cylinder to pull the oil well lever to do linear reciprocating motion so as to realize oil extraction work. The device has the characteristics of simple structure, reliable work and stable movement;

2. the design of the walking-beam-free hydraulic pumping unit can be completed by adopting the design that the sum of the traction force of the power-assisted assembly and the gravity of the weight box is slightly larger than the load of an oil well polish rod. The oil pumping is completed by small power, the power ratio of the up-stroke motor to the down-stroke motor is small, and the energy-saving efficiency is obvious;

3. the load and the stroke frequency of the non-beam hydraulic oil pumping machine are adjusted in a hydraulic system, so that the suspension point load can be increased, the stroke frequency can be increased, and the speeds of the upper stroke and the lower stroke of the non-beam hydraulic oil pumping machine can be separately adjusted. Meanwhile, the tower frame structure increases the stroke, so the walking-beam-free hydraulic pumping unit has wider application range and can be applied to thick oil wells, thin oil wells, deep oil wells with different types or different stroke requirements and the like with different loads;

4. the non-beam hydraulic pumping unit adopts a closed and folding structural design, can stand and lay down, stands when in operation, lays down when in maintenance, is convenient to transport and maintain;

5. the balance type crown block design of the walking-beam-free hydraulic pumping unit increases the stability of the top of the frame; meanwhile, the contact area between the roller of the crown block and the second traction rope and the contact area between the roller of the crown block and the third traction rope are increased, so that the oil pumping process is more stable. Meanwhile, the whole machine yield can be adjusted, so that the reliability of well workover yield is ensured;

6. the fixed pulley block, the movable pulley block and the auxiliary hydraulic cylinders of the power-assisted assembly of the walking-beam-free hydraulic pumping unit can be flexibly combined or adjusted in number and the like, so that the walking-beam-free hydraulic pumping unit has a double-stroke function, particularly the auxiliary hydraulic cylinders can be flexibly used, the mounting capacity is high, and the loading capacity is also enhanced;

7. the walking-beam-free hydraulic pumping unit has the advantages of small volume, compact structure and small occupied area, and can meet the oil field development of different geographic environments by installing unnecessary prefabricated base platforms;

8. the non-beam hydraulic pumping unit can adopt electromechanical and hydraulic integrated design, and is convenient for realizing automatic control and remote control.

Drawings

FIG. 1 is a schematic diagram of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 2 is a side view of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 3 is another side view of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 4 is a top view of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another configuration of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 6 is a side view of another configuration of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 7 is a schematic side-down view of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 8 is a schematic view of a crown block of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 9 is a top view of a crown block of a non-beam hydraulic pumping unit according to an embodiment of the present invention;

fig. 10 is a side view of a crown block of a non-beam hydraulic pumping unit according to an embodiment of the present invention;

FIG. 11 is a schematic view of a portion of a counterweight box of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 12 is a first schematic diagram of a power assisting assembly of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 13 is a second schematic diagram of a power assisting assembly of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 14 is a third schematic diagram of a power assisting assembly of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 15 is a schematic diagram of another power assist assembly for a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 16 is a schematic view of yet another power assist assembly for a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 17 is a first schematic diagram of a first rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 18 is a second schematic diagram of a first rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 19 is a first schematic diagram of a first rope hanger of a non-beam hydraulic pumping unit according to another embodiment of the present invention;

fig. 20 is a second schematic diagram of a first rope hanger of a non-beam hydraulic pumping unit according to an embodiment of the present invention;

fig. 21 is a first schematic diagram of a first rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 22 is a second schematic diagram of a first rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 23 is a first schematic diagram of a second rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 24 is a second schematic diagram of a second rope hanger of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 25 is a first schematic diagram of a second rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 26 is a second schematic diagram of a second rope hanger of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 27 is a schematic view of a lead head steel part of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 28 is a first schematic view of a counterweight box of a walking-beam-free hydraulic pumping unit and a sliding assembly according to an embodiment of the present invention;

fig. 29 is a second schematic view of a counterweight box of a walking-beam-free hydraulic pumping unit and a sliding assembly according to an embodiment of the present invention;

FIG. 30 is a first schematic view of a counterweight box of a walking beam-free hydraulic pumping unit in cooperation with another sliding assembly according to an embodiment of the present invention;

fig. 31 is a schematic diagram ii illustrating a counterweight box of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention being engaged with another sliding assembly;

fig. 32 is a first schematic diagram of a counterweight box and a brake assembly of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 33 is a second schematic diagram of the counterweight box and the brake assembly of the walking-beam-free hydraulic pumping unit according to the embodiment of the present invention;

fig. 34 is a first schematic diagram of a damping assembly of a walking-beam-free hydraulic pumping unit according to an embodiment of the present invention;

FIG. 35 is a second schematic view of a damping assembly of a walking beam-free hydraulic pumping unit according to an embodiment of the present invention;

fig. 36 is a schematic diagram of a hydraulic system according to an embodiment of the present invention.

In the figure, the position of the upper end of the main shaft,

100-a frame; 110-steel structure; 120-L shaped guide rails; 130-a lifting hydraulic cylinder;

200-overhead traveling crane; 210-a support frame; 220-a first pulley; 230-a second pulley; 240-a third pulley; 250-a pulley seat; 260-a roller; 270-roller seat;

300-weight box; 310-a lifting lug; 311-shaft groove; 320-a bottom pad; 330-a pin shaft; 340-a fifth wheel; 350-pulley groove;

400-a booster component; 401-fixing plate; 402-master cylinder; 403-fixing seat; 404-a movable seat; 405-a fixed pulley group; 406-a movable pulley block; 407-orbit; 408-a wedge joint; 409-a first bearing; 410-cushion blocks; 411-secondary hydraulic cylinder; 412-a guide bar; 413-a second bearing;

510-a first pull cord; 520-a second pull cord; 530-a third pull cord;

610-a base; 620-a support; 630-an electronic control system;

700-a first rope hanger; 710-a first traction sheave; 720-a second traction sheave; 730-a first traction groove; 731-first rope groove; 732-a first circular groove; 740-pulley pin roll; 750-draw bolts; 760-a clamping block; 770-an arc-shaped block;

800-a second rope hanger; 810-polished rod connecting grooves; 820-a second traction groove; 821-a second rope groove; 822-a second circular groove; 830-a third traction groove; 831-third rope groove; 832-a third circular groove; 840-a clamp; 850-connecting bolts; 860-polished rod hole; 870-a leash attachment hole; 871-rope end hole; 872-rope holes;

900-lead steel parts; 910-a rope end chuck; 911-steel wire rope through hole; 912-wire rope expansion holes; 920-wedge block; 930-a screw with a rope end;

1000-a sliding assembly; 1010-a fixing frame; 1020-a roller;

1100-a brake assembly; 1110-a drive link; 1120-a first link pin; 1130-brake blocks; 1140-fixing the pin shaft; 1150-second link pin;

1200-a buffer assembly; 1210-a buffer; 1220-a cushion pad;

1311-oil storage tank; 1312-a cooler; 1313-relief valve; 1320-hydraulic pump; 1321-main oil pump; 1322-a first motor; 1323-a first filter; 1324-secondary oil pump; 1325-a second motor; 1326 — a second filter; 1327-pressure gauge; 1328-watch ball valve; 1330-function switching valve; 1340-working electromagnetic valve; 1350-working one-way relief valve; 1360-frame lift valve; 1371-a first relief and check valve; 1372-a second relief and check valve; 1381-a work switch; 1382-carry switch.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which various details of embodiments of the invention are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

As shown in fig. 1 to 7, a walking-beam-free hydraulic pumping unit provided by an embodiment of the present invention mainly includes: frame 100, overhead traveling crane 200, weight box 300, helping hand subassembly 400, first haulage rope 510 and second haulage rope 520. The pumping unit provided by the embodiment of the invention is a non-beam hydraulic pumping unit, mechanical energy generated by high-speed rotation of a motor is converted into hydraulic energy through a hydraulic pump in a hydraulic transmission mode, and the hydraulic pressure is used as a power transmission mode, so that the pumping unit is simple in structure, reliable in work and stable in movement. The tower structure increases the stroke, reduces the stroke frequency, can reduce the fatigue damage of the sucker rod, prolongs the service life of the sucker rod, and can reduce the suction void ratio of the non-beam hydraulic oil pumping unit and improve the oil pumping rate. The oil well polished rod is pulled by the aid of the power assisting assembly 400 through the traction rope, the oil well polished rod is also directly pulled by the weight box through the traction rope, namely, two acting forces act on the polished rod simultaneously to reciprocate up and down, so that the sum of the hydraulic traction force and the gravity of the weight box 300 is in a balance relation with the load of the oil well polished rod, namely, the power assisting assembly 400 only needs small power to complete oil pumping work, and the efficiency is improved.

Specifically, a crown block 200 is connected to the top of the frame 100. A first traction rope 510 passes through the crown block 200, the power assisting assembly 400 is disposed adjacent to the frame 100, the first traction rope 510 is used for connecting the power assisting assembly 400 and the oil well polish rod, and the power assisting assembly 400 is used for pulling the first traction rope 510, thereby pulling the oil well polish rod upwards. A second pull line 520 passes through the crown block 200, and the second pull line 520 is used to connect the weight box 300 and the oil well polish rod. The weight box 300 is movable in a vertical direction along the rack 100.

In the embodiment of the present invention, when the walking-beam-free hydraulic pumping unit is operating, the power assisting assembly 400 can provide a force for pulling the first pulling rope 510 (i.e., pulling the polish rod of the oil well upward), and the weight box 300 moves from the upper portion to the lower portion of the frame 100 (i.e., under the action of newton's theorem), and provides a force for pulling the second pulling rope 520 (i.e., pulling the polish rod of the oil well upward). When the boosting assembly 400 pulls the oil well polish rod upwards, the oil well polish rod simultaneously bears two acting forces, and the sum of the two acting forces is greater than the load of the oil well polish rod, so that the polish rod is subjected to an upward stroke movement to pump oil; when the electric control system 630 controls the power-assisted assembly 400 to stop pulling the oil well polish rod, the load of the oil well polish rod is greater than the hydraulic return force of the power-assisted assembly 400 and the gravity of the weight box 300, so that the polish rod downstroke motion is performed, and the operation of the walking-beam-free hydraulic pumping unit is realized by repeating the steps.

In the embodiment of the invention, when the walking-beam-free hydraulic pumping unit operates, the power assisting assembly 400 can provide a force for pulling the first traction rope 510, namely a pulling force for pulling the polish rod of the oil well to move upwards; the weight box 300 is subjected to Newton's theorem at the upper part of the frame, and the downward movement also has the acting force of the second traction rope 520, namely the gravity for pulling the polish rod of the oil well to move upwards. When the electric control system 630 gives a pulling force to the power-assisted assembly 400 to pull the oil well polish rod upwards, the oil well polish rod simultaneously receives two acting forces, and the sum of the two acting forces is greater than the load of the oil well polish rod, so that the oil pumping is realized by the upward stroke movement; when the electric control system 630 controls the power-assisted assembly 400 to stop pulling the oil well polish rod, the load of the oil well polish rod is larger than the hydraulic return force of the power-assisted assembly 400 and the gravity of the weight box 300, so that the lower stroke movement is carried out, and the operation of the walking-beam-free hydraulic pumping unit can be realized through the reciprocating movement.

It should be noted that: the weight box 300 can contain a weight block inside to increase or decrease the weight of the weight box 300 according to the load of the polish rod of the oil well, so that the oil well can be adapted to a wider range. The weight of the weight box 300 after weighting is in principle less than the load of the polish rod of the oil well.

The walking-beam-free hydraulic pumping unit provided by the embodiment of the invention adopts a balance mode of the sum of the tension and the gravity and the load of the polish rod of the oil well, and can realize an ideal balance effect. Namely, the hydraulic system gives the first hauling rope 510 of the boosting assembly 400 the force of pulling the polish rod of the oil well, after the weight box 300 is weighted, the gravity of the upper part of the rack 100 moving to the lower part, namely, the weight box 300 moving downwards drives the connected second hauling rope 520 to pull the polish rod of the oil well to do the up stroke operation, so as to realize the oil extraction process; when the oil well polish rod reaches the pre-reaching point, namely when the power assisting assembly 400 operates and reverses, the hydraulic system does not provide traction force for the first traction rope 510 of the power assisting assembly 400 any more, the load of the oil well polish rod is larger than the sum of the traction force and the gravity, so that the weight box 300 is pulled to move from the lower part to the upper part of the rack 100, the oil well polish rod performs downstroke motion, namely two acting forces simultaneously act on the oil well polish rod to perform up-and-down reciprocating motion, and the oil pumping work can be completed.

As a preferred implementation manner, an embodiment of the present invention provides a walking-beam-free hydraulic pumping unit, which includes: the frame 100, the crown block 200, the weight box 300, the power assist assembly 400, the first pull line 510, the second pull line 520, and at least one of: hydraulic lift cylinder 130, base 610, bracket 620, electronic control system 630, and safety barrier (not shown), sliding assembly 1000, brake assembly 1100, damping assembly 1200, first boom 700, second boom 800, and third pull line 530.

The machine frame 100 may be composed of steel structures 110 configured as a hexahedral frame, the steel structures 110 connected in multiple sections are movably connected, one end of the steel structure 110 at the lowermost end is hinged to the base 610, the other end is movably connected to the base 610 (for example, connected by a fixing bolt), a vertical fixing channel is formed inside the steel structure 110, and the weight box 300 may slide up and down along the fixing channel. The vertical inner angle of the steel structure 110 may further be connected with an L-shaped rail 120, that is, the L-shaped rail 120 is located at the inner angle of the fixed passage, and the weight box 300 can move in the vertical direction along the L-shaped rail 120, or a fixed rail is provided in the rack 100, so that the weight box 300 can move in the vertical direction along the fixed rail. The frame 100 is formed by adopting a plurality of sections of steel structures 110, so that the steel structures 110 connected in a plurality of sections can be fixedly connected, namely the steel structures 110 are fixedly connected (the frame 100 is an integral part), the height of the walking-beam-free hydraulic pumping unit can be set according to the requirements of oil well strokes and the like, and the application range is wide. The power assisting assembly 400 is disposed adjacent to the frame 100, and specifically, the power assisting assembly 400 may be fixed on the base 610 and directly connected to the base 610. Or, the boosting assembly 400 can be fixed at the rear side of the frame 100, and the two boosting assemblies 400 are arranged in different stroke effects. The base 610 is fixed in the installation place, and lower extreme one side and the base of frame 100 are articulated, opposite side and base active link and use the bolt fastening, and the top of frame 100 is connected with overhead traveling crane 200. The hydraulic cylinder 130 is located on the middle lower side surface of the connected frame 100, two ends of the hydraulic cylinder 130 are respectively connected with the frame 100 and the base 610 on the middle lower side surface, the hydraulic cylinder 130 is used for lifting the frame 100, the frame 100 can be laid down under the condition that the non-beam hydraulic pumping unit is not detached through the hydraulic cylinder 130, and complexity of operations such as installation and maintenance is reduced. After the frame 100 is erected, the hydraulic lifting cylinder 130 can support the frame 100, so that the frame 100 is more stable. The bracket 620 is located at an end of the base 610, and the bracket 620 can support the rack 100 when the rack 100 is tipped sideways, for convenience in installation, maintenance, and the like. The electric control system 630 is located on the rear side of the base 610, and the electric control system 630 is used for controlling the power assisting assembly 400 and the lifting hydraulic cylinder 130, supplying power to the electric parts of the walking-beam-free hydraulic pumping unit, and providing some protections, such as phase loss, load interruption, load loss, overload and the like (these protections can be achieved by the existing technical scheme, and are not described herein again). The safety barrier is located the edge of base 610, and the safety barrier can keep apart irrelevant personnel and object, protects people and animals life and property safety.

It should be noted that the number of the hydraulic lift cylinders 130 can be set as desired, and as a preferred embodiment, the connection of the hydraulic lift cylinders 130 to the frame 100 and the base 610 can be hinged. The first pulling rope 510, the second pulling rope 520 and the third pulling rope 530 can be made of steel wire ropes or other materials with better tensile property, folding resistance and toughness.

As shown in fig. 5 to 10, in the embodiment of the present invention, the crown block 200 may include a support frame 210, a first pulley 220, a second pulley 230, a third pulley 240, a pulley seat 250, a roller 260, a roller seat 270, and the like.

The first pulley 220 is located on the side of the support frame 210 close to the power assisting assembly 400, the second pulley 230 is located above the weight box 300, and the third pulley 240 is located on the side of the support frame 210 close to the polish rod of the oil well. At least one roller 260 is connected to the upper portion of the supporting frame 210, the roller 260 is higher than the first pulley 220, the second pulley 230 and the third pulley 240, that is, the roller 260 is located above the first pulley 220, the second pulley 230 and the third pulley 240, and a rope groove may be provided on the circumferential surface of the roller 260, and the rope groove is used to improve the contact area and the running angle of the first traction rope 510 and the second traction rope 520 on the crown block 200. When the roller 260 is disposed above the first pulley 220 and the third pulley 240, the first pulling rope 510 is sequentially wound around the upper portions of the first pulley 220, the roller 260 and the third pulley 240, i.e., the first pulling rope 510 is connected to the polish rod of the oil well after passing through the upper portion of the first pulley 220, the rope groove of the roller 260 and the upper portion of the third pulley 240 after coming out of the power assisting assembly 400. When the roller 260 is disposed above the second pulley 230 and the third pulley 240, the second pulling rope 520 is sequentially wound around the upper portions of the second pulley 230, the roller 260, and the third pulley 240, that is, the second pulling rope 520 is pulled out from the upper portion of the weight box 300, passes through the upper portion of the second pulley 230, the rope groove of the roller 260, and the upper portion of the third pulley 240, and is connected to the polish rod of the oil well. The first pulley 220, the second pulley 230, and the third pulley 240 are all connected to the support frame 210 through pulley shafts and pulley mounts 250, and it should be noted that the pulley mounts 250 are connected to the support frame 210 and are also connected to the shafts of the first pulley 220, the second pulley 230, or the third pulley 240. It should be noted that a roller seat 270 may be disposed at the upper portion of the inner side of the supporting frame 210, and the roller 260 is connected to the supporting frame 210 through the roller seat 270; the number of the rollers 260 may be determined as required, and one roller 260 may support several pulling ropes at the same time, or each roller 260 may support only one pulling rope, and as a preferred embodiment, each roller 260 supports at least two pulling ropes. If the third traction rope 530 is provided, the above winding manner of the first traction rope 510 on the crown block 200 is replaced by the third traction rope 530.

As shown in fig. 29, in the embodiment of the present invention, the upper and lower ends of the weight box 300 at the lateral edges thereof may be provided with pulley grooves 350, and the pulley grooves 350 can receive the sliding assembly 1000. Further, the top of the weight box 300 may be provided in at least three forms:

the first form: as an alternative embodiment, the top of the weight box 300 is provided with a lifting lug 310 and a pin 330. Wherein, two lifting lugs 310 parallel to each other are connected to the top of the weight box 300. The two ends of the pin 330 are connected with the two lifting lugs 310, or the pin 330 passes through the two lifting lugs 310. The second pull cord 520 is coupled to the pin 330.

The second form: as an alternative embodiment, as shown in fig. 11, the weight box 300 is provided with a lifting lug 310 and a connecting wheel 340 at the top. Wherein, two lifting lugs 310 parallel to each other are connected to the top of the weight box 300. The connecting wheel 340 is connected between the two lifting lugs 310. The pin 330 is located at the center of the connecting wheel 340 and connected to the lifting lug 310. The second traction rope 520 is passed around from the lower side of the fifth wheel 340.

The third form: as an alternative embodiment, as shown in fig. 28, the top of the weight box 300 is provided with two parallel lifting lugs 310, a pin 330 and a connecting wheel 340. The lifting lug 310 is connected to the top of the weight box 300, and the lifting lug 310 is provided with a longitudinal shaft slot 311, and the shaft slot 311 may be a long circular hole slot. The pin 330 is connected to the center of the connecting wheel 340 and slidably disposed in the axial slot 311, i.e. the pin 330 can move up and down in the axial slot 311. The second traction rope 520 is passed around from the lower side of the fifth wheel 340.

It should be noted that the lifting lug 310 and the weight box 300 may be fixedly connected, and the lifting lug 310 and the weight box 300 are integrally formed.

The power assisting assembly 400 of the embodiment of the invention can be at least arranged in the following two forms:

form one

As an alternative embodiment, as shown in fig. 1-2 and 12-14, the power assist assembly 400 may include the following components: the hydraulic cylinder comprises a main hydraulic cylinder 402, a fixed seat 403, a movable seat 404, a fixed pulley block 405, a movable pulley block 406, a rail 407, a wedge joint 408, a first bearing 409, a cushion block 410, an auxiliary hydraulic cylinder 411, a second bearing 413 and a reversing device. The power-assisted assembly 400 is horizontally arranged along the base 610 and is fixedly connected with the base 610, so that the stability of the power-assisted assembly 400 is obviously enhanced, and the falling of the rack 100 is not influenced; meanwhile, a large space is reserved for the fixed pulley block 405, the movable pulley block 406 and the like, and adjustment and combination among the fixed pulley block 405, the movable pulley block 406 and the auxiliary hydraulic cylinder 411 are more convenient.

Specifically, the rail 407 and the fixing base 403 are respectively fixedly connected to the base 610. One end of the rail 407 is connected to the fixing base 403, and the other end is connected to the cross beam of the base 610. The movable seat 404 is used for supporting the movable pulley block 406. A first bearing 409 and a second bearing 413 are connected to both sides of the movable base 404, and one end is connected to the master cylinder 402. The first bearing 409 and the second bearing 413 are vertically fixed at two sides of the movable seat 404, and the first bearing 409 and the second bearing 413 are in sliding fit with the rail 407, so that the movable seat 404 can stably slide along the rail 407. The fixing base 403 is used for supporting the fixed pulley block 405, and the fixed pulley block 405 can be fixed on the fixing base 403. The master cylinder 402 is disposed between the fixed seat 403 and the movable seat 404, and the master cylinder 402 pushes the movable seat 404 to slide along the rail 407. The sub-hydraulic cylinder 411 is also disposed between the fixed seat 403 and the movable seat 404, and the movable pad 410 is disposed between the sub-hydraulic cylinder 411 and the movable seat 404. When the sub-hydraulic cylinder 411 is used, the pad 410 is fixed to the end of the piston rod of the sub-hydraulic cylinder 411. The wedge joint 408 is hinged to the side of the fixed seat 403, and the wedge joint 408 is used for fixing one end of the first traction rope 510. Two limit switches (not shown) of the reversing device are mounted on the side surface of the rail 407 and are respectively located at the front and rear moving ends of the movable base 404, and the positions of the two limit switches respectively correspond to a predetermined front-to-point and a predetermined rear-to-point of the movable base 404, so that the movable base 404 makes reciprocating motion within the front and rear moving range.

It should be noted that the rail 407 is a dedicated channel steel, and the first bearing 409 and the second bearing 413 can roll in the channel steel, so that the friction force during the operation of the movable seat 404 is reduced, and the stability during the operation of the movable seat 404 is improved. In one power assisting assembly 400, one master cylinder 402 may be provided, one master cylinder 402 and one or more auxiliary cylinders 411 may be provided, and the diameter and cross-sectional area of the master cylinder 402, the diameter and cross-sectional area of the auxiliary cylinders 411, and the number of the auxiliary cylinders 411 may be set according to different requirements such as oil well load. One master cylinder 402 and two auxiliary cylinders 411 are provided as a preferred embodiment, but only the master cylinder 402 is used for working when the walking beam-free hydraulic pumping unit is in normal operation; when mounting and overloading, the auxiliary hydraulic cylinder 411 is used, otherwise, the auxiliary hydraulic cylinder is standby. In addition, the number of the fixed pulleys in the fixed pulley group 405, the number of the movable pulleys in the movable pulley group 406 and the stroke of the oil cylinder can be set according to different requirements such as oil well load, stroke or stroke frequency.

The electronic control system 630 can control the hydraulic system to provide power to the master cylinder 402 and the auxiliary cylinder 411, so that the piston rods of the master cylinder 402 and/or the auxiliary cylinder 411 can extend and contract, and the reversing device limits the range of the piston rod stroke of the master cylinder 402 and/or the auxiliary cylinder 411, that is, the movable seat 404 reciprocates between a preset front-to-point and a preset rear-to-point. When the piston rod of the main hydraulic cylinder 402 and/or the auxiliary hydraulic cylinder 411 is/are extended to operate, the movable seat 404 is pushed to move towards a preset forward-reaching point, and the oil well polish rod is pulled to move upwards through the first traction rope 510; the weight box 300 moves downwards in the rack 100 based on newton's theorem, i.e. the oil well polish rod is simultaneously pulled to move upwards by the second traction rope 520; when the polish rod of the oil well runs to the upper pre-bottom point and the weight box 300 reaches the lower pre-bottom point, the movable seat 404 reaches the preset front-bottom point. At this time, the movable seat 404 touches the front limit switch, the reversing device feeds back to the hydraulic system, the hydraulic system no longer provides power to the main hydraulic cylinder 402 and the auxiliary hydraulic cylinder 411, the movable seat 404 turns to move to a predetermined backward extreme point, the load of the polish rod of the oil well is greater than the sum of the two acting forces, the movable seat turns to move downwards, and the weight box 300 is pulled to move upwards. It should be noted that, after the hydraulic system receives the feedback, the hydraulic system stops providing power to the master cylinder 402 and/or the auxiliary cylinder 411, in this case, the load of the polish rod of the oil well is larger than the sum of the two acting forces and moves downward, and the first traction rope 510 pulls the pulley block to move reversely, so that the piston rod of the master cylinder 402 and/or the auxiliary cylinder 411 contracts. When the polish rod of the oil well reaches the lower pre-arrival point, the weight box 300 reaches the upper pre-arrival point. I.e., the movable floor 404 reaches a predetermined rear threshold. At this time, the movable seat 404 touches the rear limit switch, the reversing device feeds back to the hydraulic system, and the hydraulic system provides power to the master cylinder 402 and/or the auxiliary cylinder 411, so that the piston rod of the master cylinder 402 and/or the auxiliary cylinder 411 is rotated and extended to form the reciprocating motion of the movable seat 404.

It should be noted that, the number of the pulleys of the fixed pulley block 405 and the movable pulley block 406, and the stroke distance of the oil cylinder have a double-stroke relationship with the stroke of the polish rod of the oil well, and the actual arrangement of the fixed pulley block 405 and the movable pulley block 406, and the stroke distance of the oil cylinder can be set according to the requirement of the lever stroke of the oil well.

Note that, in this form, the piston rods of the master cylinder 402 and the slave cylinder 411 extend and contract in the horizontal direction, and the predetermined forward-most point and the predetermined backward-most point of the movable base 404 are also on the same horizontal plane.

Form two

As an alternative embodiment, as shown in fig. 5, 6, 15 and 16, in the walking-beam-free hydraulic pumping unit of the embodiment of the present invention, the power assisting assembly 400 may include the following components: the device comprises a fixed plate 401, a main hydraulic cylinder 402, a fixed seat 403, a movable seat 404, a fixed pulley block 405, a movable pulley block 406, a wedge joint 408, a cushion block 410, an auxiliary hydraulic cylinder 411, a guide rod 412 and a reversing device.

Specifically, the fixing plate 401 and the fixing base 403 are respectively fixed on the lower sides of the connected steel structures 101, and the fixing plate 401 is located above the fixing base 403. The two ends of the guide rod 412 are respectively connected with the fixing plate 401 and the fixing seat 403. The movable seat 404 is used for supporting the movable pulley block 406, and the movable seat 404 can stably slide along the guide rod 412. The fixing base 403 is used for supporting the fixed pulley group 405. The master cylinder 402 is disposed between the fixed base 403 and the movable base 404, and the master cylinder 402 can push the movable base 404 to slide along the guide bar 412. The auxiliary hydraulic cylinder 411 is also disposed between the fixed seat 403 and the movable seat 404, and a movably disposed cushion block 410 can be added between the auxiliary hydraulic cylinder 411 and the movable seat 404, so that when the auxiliary hydraulic cylinder 411 needs to be used, the cushion block 410 is temporarily fixed to the upper end of the piston rod of the auxiliary hydraulic cylinder 411 and is connected to the lower end of the movable seat 404. The wedge joint 408 is hinged to the side of the fixed seat 403, and the wedge joint 408 is used for fixing one end of the first traction rope 510. Two limit switches (i.e., an upper limit switch and a lower limit switch, not shown in the figure) of the reversing device are connected to the side of the guide rod 412, the upper limit switch is located above the movable base 404 (the position of the upper limit switch is a predetermined upper endpoint), the lower limit switch is located below the movable base 404 (the position of the lower limit switch is a predetermined lower endpoint), and the reversing device is used for enabling the movable base 404 to reciprocate up and down within a certain range (i.e., between the predetermined upper endpoint and the predetermined lower endpoint).

It should be noted that, in one power assisting assembly 400, only one master cylinder 402 may be provided, one master cylinder 402 and one or more auxiliary cylinders 411 may also be provided, and the diameter and cross-sectional area of the master cylinder 402, the diameter and cross-sectional area of the auxiliary cylinders 411, and the number of the auxiliary cylinders 411 may be set according to different requirements such as oil well load, and as a preferred embodiment, one master cylinder 402 and two auxiliary cylinders 411 may be provided, but the master cylinder 402 may be used only during normal production use, and if the auxiliary cylinders 411 are used, the spacer 410 may be required to be placed between the piston rod of the auxiliary cylinders 411 and the movable seat 404, otherwise, the spacer may not be required. In addition, the number of the fixed pulleys in the fixed pulley group 405 and the number of the movable pulleys in the movable pulley group 406 can also be set according to different requirements such as oil well load, stroke or stroke frequency.

The electronic control system 630 can control the hydraulic system to provide power to the master cylinder 402 and the auxiliary cylinder 411, so that the piston rod of the master cylinder 402 and/or the auxiliary cylinder 411 can be lifted, and the stroke range and the running direction of the piston rod of the master cylinder 402 and/or the auxiliary cylinder 411, that is, the movable seat 404 can reciprocate up and down between a preset upper bottom point and a preset lower bottom point, can be realized by using the reversing device. When the piston rod of the master cylinder 402 and/or the slave cylinder 411 moves upward, the movable seat 404 is driven to move to a predetermined upper dead point, the polish rod of the oil well is pulled to move upward by the first pulling rope 510, and the weight box 300 moves downward simultaneously based on newton's theorem. When the upper end of the polish rod of the oil well reaches the upper pre-arrival point, that is, the movable seat 404 reaches the predetermined upper pre-arrival point and touches the upper limit switch, the upper end of the polish rod of the oil well reaches the upper pre-arrival point, and the weight box 300 also reaches the lower pre-arrival point, at this time, the reversing device feeds back to the electronic control system 630, the electronic control system 630 controls the hydraulic system to stop outputting hydraulic pressure to the main hydraulic cylinder 402 and/or the auxiliary hydraulic cylinder 411, the load (gravity) of the polish rod of the oil well is greater than the gravity of the weight box 300 and the hydraulic return force of the hydraulic system, so that the movable seat 404 is converted to move to the predetermined lower arrival point, the polish rod of the oil well descends to drive the weight box 300 to move upwards, the polish rod of the oil well is converted to move downwards, it should be noted that after the hydraulic system receives the feedback, the hydraulic system can make the piston rods of the main hydraulic cylinder 402 and/or the auxiliary, in this case, the well rod is loaded to travel downward, and the main cylinder 402 and/or the auxiliary cylinder 411 are retracted against the hydraulic return force by the first traction rope 510. When the movable seat 404 reaches a predetermined lower extreme point and touches the lower limit switch, the upper end of the polish rod of the oil well reaches a lower pre-extreme point, the weight box 300 also reaches an upper pre-extreme point, and the reversing device feeds back to the hydraulic system, so that the piston rods of the main hydraulic cylinder 402 and/or the auxiliary hydraulic cylinder 411 rotate to move upwards, and thus the movable seat 404 reciprocates between the predetermined upper extreme point and the predetermined lower extreme point. In the stroke range, the piston rod of the main hydraulic cylinder 402 (or the piston rods of the main hydraulic cylinder 402 and the auxiliary hydraulic cylinder 411) can be extended and contracted, and the distance between the fixed pulley block 405 and the movable pulley block 406 can be controlled, so that the first traction rope 510 can be pulled. The fixed pulley set 405 and the movable pulley set 406 of the power assisting assembly 400 can enable the oil well polished rod of the walking-beam-free hydraulic pumping unit to have a double-stroke function.

It should be noted that the normal pumping operation is only the operation of the master cylinder 402, the master cylinder 402 and the auxiliary cylinder 411 are simultaneously operated when the load is mounted, and the master cylinder 402 and the auxiliary cylinder 411 are also simultaneously operated when the load suddenly increases beyond the normal weight value.

It should be noted that the two installation forms of the booster assembly 400 have different effects, and the installation of the booster assembly 400 on the base 610 optimizes the stroke, so that the overall stability is stronger; the power assisting assembly 400 is mounted outside the frame 100, so that the frame is light and compact in structure, and the actual mounting of the frame is combined with the mounting of an oil well.

In an embodiment of the present invention, the sliding assembly 1000 includes a fixed frame 1010 and a roller 1020. The sliding members 1000 are connected to the upper and lower ends of the four sides of the weight box 300 such that the sliding members 1000 are located between the weight box 300 and the frame 100, or the sliding members 1000 are located between the weight box 300 and the dedicated rails of the frame 100. The sliding assembly 1000 for installing the weight box 300 slides along the vertical direction of the rack 100, so that the friction force when the weight box 300 slides is reduced, and the sliding process is smoother.

The sliding assembly 1000 of the embodiment of the present invention can be set in at least the following two forms:

in the first form, as shown in fig. 30 and 31, the fixing frame 1010 is connected to the upper and lower ends of the four sides of the weight box 300, and the connection may be detachable by bolts or the like, or may be fixed by welding or the like. The fixing frame 1010 is used for supporting the roller 1020, and the roller 1020 rolls along the rack 100 in the vertical direction.

As a preferred embodiment, eight sets of sliding members 1000 may be provided at upper and lower ends of each side edge of the weight box 300, and the rollers 1020 may roll along both edges of the L-shaped rail 120.

In the second form, as shown in fig. 28 and 29, the fixing frame 1010 is connected to the pulley groove 350 of the weight box 300, and the connection may be a detachable connection such as a bolt or a fixed connection such as welding. The roller 1020 is connected to the fixing frame 1010. As a preferred embodiment, the pulley grooves 350 may be formed at the side edges of the upper and lower ends of the four sides of the weight box 300, and the spaces of the pulley grooves 350 may have a rectangular parallelepiped shape. Two sets of sliding assemblies 1000 are connected in each pulley groove 350, that is, two fixing frames 1010 are respectively connected to the inner walls of two sides in the pulley groove 350, two rollers 1020 are perpendicular to each other, and the two rollers 1020 can respectively roll along two inner side surfaces of the L-shaped guide rail 120.

In the embodiment of the present invention, the brake assembly 1100 is an internal expansion type mechanism, and the brake assembly 1100 is used for abutting against the frame 100 or the L-shaped rail 120 in the frame 100 when the second traction rope 520 is separated from the weight box 300. In the operation process of the walking-beam-free hydraulic pumping unit, once the second traction rope 520 connected with the weight box 300 breaks down, the weight box 300 falls to the lower part of the rack 100 due to self weight, and the friction force generated by the braking assembly 1100 and the rack body of the rack 100 generates a braking effect, so that the weight box 300 is prevented from falling to damage the rack 100, the base 610 and other components.

As shown in fig. 33, brake assembly 1100 includes a drive link 1110, a first link pin 1120, a second link pin 1150, a brake block 1130, and a fixed pin 1140. The upper end of the transmission link 1110 can contact the pin 330, and the lower end of the transmission link 1110 is rotatably connected to the second link pin 1150. The fixed pin 1140 is disposed on the inner side surface of the weight box 300. One end of the brake block 1130 is rotatably connected to the second connecting rod pin 1150, the middle portion of the brake block 1130 is rotatably connected to the fixed pin 1140, and the other end of the brake block 1130 is used for abutting against the rack 100 when the weight box 300 falls freely. The driving link 1110 is connected to the brake block 1130 by a first link pin 1120, and the brake block 1130 and the fixing pin 1140 form a lever. When the pin 330 is located at the bottom of the slot 311, the pin presses the transmission link 1110 to press one end of the brake block 1130 downward, so that the other end of the brake block 1130 extends outward due to the lever action and is pressed against the frame 100 or the L-shaped guide rail 120 to generate a large friction force, thereby playing a braking role; when the pin 330 is at the top of the slot 311, the drive link 1110 pulls one end of the brake block 1130 upward, and the other end of the brake block 1130 is not in contact with the frame 100 (i.e., is not in contact with the frame 100) due to leverage.

It should be noted that, when the walking-beam-free hydraulic pumping unit according to the embodiment of the present invention is provided with the brake assembly 1100, the top of the weight box 300 adopts the form three.

As another preferred embodiment, as shown in fig. 32, a transmission link 1110 may be connected to each end of the pin 330, the transmission link 1110 has an n-shaped side surface, the two lower ends of the transmission link 1110 are connected to a link pin 1120, a brake block 1130, and a fixed pin 1140, respectively, and the two fixed pins 1140 connected to the two lower ends are symmetrically disposed along the axis of the weight box 300.

During the operation of the walking-beam-free hydraulic pumping unit, when the weight box 300 is working normally (i.e. can slide up and down along the machine frame 100 in a controlled manner), the pin 330 at the upper part of the weight box 300 is always located at the upper part of the shaft slot 311 under the action of the oil well polish rod load transmitted by the second traction rope 520, and the brake block 1130 is in a contracted state (i.e. no contact with the machine frame 100). When the second pulling rope 520 connected with the weight box 300 is broken, the weight box 300 loses tension, the weight box 300 can freely fall to the lower part of the rack 100 due to self weight, the pin shaft 330 or the connecting wheel 340 can also fall to the lower part of the shaft slot 311 due to self weight, when the weight box falls to the bottom shaft slot 311, the transmission connecting rod 1110 is triggered to move downwards, the transmission connecting rod 1110 presses one end of the brake block 1130 downwards, the other end of the brake block 1130 extends outwards and is abutted against the rack 100 due to lever action, so that friction force is generated between the transmission connecting rod 1110 and the inner side wall of the rack 100 or the L-shaped guide rail 120, and the friction force is increased along with the falling of the weight box 300 until the falling weight box 300 is braked or slowly falls.

In the embodiment of the present invention, the buffering assembly 1200 may be disposed below the weight box 300, so that the weight box 300 is smoothly attached to the buffering assembly 1200 when moving to the bottom of the rack 100. As shown in fig. 28, a bottom pad 320 may be further added to the bottom surface of the weight box 300, so that the impact of the weight box 300 on the bottom of the rack 100 can be reduced by the bottom pad 320 or the buffer assembly 1200, and the damage to the rack 100 caused by the free falling of the weight box 300 can be reduced.

As shown in fig. 34 and 35, the bumper assembly 1200 may include a bumper 1210 and a bumper pad 1220. Both bumper 1210 and bumper pad 1220 may be disposed below weight box 300, wherein bumper 1210 is connected to base 610. A bumper 1220 is disposed on the base 610 and positioned around the bumper 1210. It is noted that bumper 1210 is a compression spring or polyurethane bumper, wherein the polyurethane bumper is energy absorbing and cushioning with a micro-porous bubble structure having a number of pages of polyurethane material, which acts as a spring with multi-cell damping during impact. The bumper 1220 may be rubber or foam concrete and the bumper 1220 may be unitary or may be made up of multiple parts. The thickness of bumper 1220 is greater than the working length of bumper 1210 and less than the natural length of bumper 1210. The footprint of the bumper 1220 is greater than or equal to the bottom surface of the weight box 300 and is just within or covering the footprint of the bumper 1220 when the weight box 300 is moved to the bottom of the rack 100.

In addition, the arrangement of the buffer assembly 1200 can be in various forms, and the embodiment of the invention provides two preferable modes:

first, at least four buffers 1210 are provided, and the distribution of the buffers 1210 may be configured according to the shape of the bottom surface of the weight box 300, for example, if the bottom surface of the weight box 300 is a quadrangle, the buffers 1210 may be configured corresponding thereto. Bumper 1220 is laid around the circumference of bumper 1210. When the weight box 300 moves to the bottom of the rack 100, the bumper 1210 abuts against the bottom surface of the weight box 300 and is close to the edge of the weight box 300, and the cushion 1220 abuts against the bottom surface of the weight box 300.

In the second mode, a buffer 1210 is provided. The bumper 1210 is disposed according to the center of gravity of the weight box 300. Bumper 1220 is laid around bumper 1210. When the weight box 300 moves to the bottom of the rack 100, the bumper 1210 abuts against the bottom surface of the weight box 300 and is located right below the center of gravity of the weight box 300, and the cushion 1220 abuts against the bottom surface of the weight box 300.

The winding pattern for the first traction rope 510 and the second traction rope 520 may be determined as desired. The embodiment of the present invention is illustrated by the following two ways:

first, the crown block 200 is provided with a first pulley 220, at least one second pulley 230, and at least two third pulleys 240. The fixed seat 403 is provided with a wedge joint 408 at a side surface thereof, the fixed pulley block 405 comprises at least two fixed pulleys, and the movable pulley block 406 comprises at least two movable pulleys, i.e. the fixed pulley block 405 has a plurality of fixed pulleys, and the movable pulley block 406 has a plurality of movable pulleys.

In this case, one end of the first pull-cord 510 is connected to the wedge adapter 408 for fixation. The rope body of the first traction rope 510 is wound on the upper part of the movable pulley and the lower part of the fixed pulley in sequence from the position close to the wedge joint 408 to the position far away from the wedge joint 408 (namely, the first traction rope 510 is wound on the outer parts of the movable pulley and the fixed pulley); the rest of the ropes are sequentially wound around the first pulley 220 and the upper portion of one of the third pulleys 240 (if there is a roller 260, the rest of the ropes are sequentially wound around the first pulley 220, one of the rollers 260 and the upper portion of one of the third pulleys 240). The other end of the first hauling cable 510 is connected to a square clamp of the polish rod of the oil well for fixing;

one end of the second traction rope 520 is connected to the pin 330 of the weight box 300 to be fixed. The rope of the second traction rope 520 is sequentially wound around the second pulley 230 and the upper portion of the other third pulley 240 (and the second pulley 230, the other roller 260 and the upper portion of the other third pulley 240 if the roller 260 is provided). The other end of the second traction rope 520 is connected to a square clip of the polish rod of the oil well for fixing.

In a second embodiment, the crown block 200 is provided with two first pulleys 220, at least one second pulley 230 and at least three third pulleys 240. The two sides of the fixed seat 403 are respectively provided with a wedge joint 408, the fixed pulley block 405 comprises at least two fixed pulleys, the movable pulley block 406 comprises at least two movable pulleys, namely, the fixed pulley block 405 has a plurality of fixed pulleys, and the movable pulley block 406 has a plurality of movable pulleys.

In this case, the remaining rope bodies on both sides of the first traction rope 510 are wound on the upper portion of the movable pulley and the lower portion of the fixed pulley in sequence from the middle of the booster assembly 400 to the position near the wedge 408 (i.e., the first traction rope 510 is wound on the outer portions of the movable pulley and the fixed pulley), and the first traction rope 510 is connected to the wedge 408, while the first traction rope 510 is connected to the first rope hanger. The rope bodies on both sides of the third hauling rope 530 are respectively and sequentially wound on the upper parts of the two third pulleys 240 and the first pulley 220 (if the roller 260 is provided, the rope bodies are sequentially wound on the upper parts of the two third pulleys 240, one of the roller 260 and the first pulley 220), and the third hauling rope 530 is respectively connected with the first rope hanger and the second rope hanger and the oil well polish rod.

One end of the second traction rope 520 is connected to the pin 330 of the weight box 300 to be fixed. The rope of the second traction rope 520 is sequentially wound around the second pulley 230 and the upper portion of the other third pulley 240 (and the second pulley 230, the other roller 260 and the upper portion of the other third pulley 240 if the roller 260 is provided). The other end of the second hauling cable 520 is connected to the square clamp of the polish rod of the oil well for fixing; or

The middle portion of the second traction rope 520 is wound around the lower side of the fifth wheel 340 of the weight box 300 to be fixed. The rope bodies on both sides of the second pulling rope 520 are respectively wound on the upper parts of the two second pulleys 230 and the other two third pulleys 240 in turn (on the upper parts of the second pulleys 230, the rollers 260 and the third pulleys 240 in turn if the rollers 260 are provided). Both ends of the second traction rope 520 are connected to the square clips of the polish rod of the oil well to be fixed. This arrangement allows the second rope hanger to be used.

It should be noted that the fixed pulleys of the fixed pulley group 405 can be further divided into two groups, and the two groups of fixed pulleys are symmetrically arranged; likewise, the movable pulleys of the movable pulley block 406 may be provided in this form.

In addition, the walking-beam-free hydraulic pumping unit of the embodiment of the present invention may be provided with two suspension rope connectors, one of which is a first rope hanger 700 located above the power assisting unit 400, the first rope hanger 700 being capable of converting one first traction rope 510 coming out of the power assisting unit 400 into a third traction rope 530 having a "two-form"; the other is a second rope hanger 800 located outside the machine frame 100, the second rope hanger 800 is connected to the oil well polished rod, and both ends of the "two-form" second pulling rope 520 coming out of the weight box 300 and the "two-form" third pulling rope 530 coming out of the first rope hanger 700 can be respectively connected to the oil well polished rod. In a preferred embodiment, the second polished rod eye 800 fixes the polish rod of the oil well to the middle end, fixes the hair strands (i.e., the lead steel 900) at both ends of the second pulling rope 520 from the weight box 300 to the outer side, and fixes the hair strands at both ends of the third pulling rope 530 to the inner side.

The first polished rod eye 700 functions: the first is the conversion: that is, the first pulling rope 510 and the third pulling rope 530 are connected by the first rope hanger 700, and the pulling force of the first pulling rope 510 is applied to the oil well polish rod from the third pulling rope 530 through the first rope hanger 700; and secondly, the oil well polish rod is protected, once the first traction rope 530 is broken, the first traction rope 510 and the third traction rope 530 are immediately discharged through the first rope hanger 700, and the oil well polish rod lacks enough traction acting force (the gravity of the weight box 300 is smaller than the load of the oil well polish rod) and falls to a lower pre-stopping point, so that the purpose of protecting the oil well polish rod is achieved.

The second polished rod eye 800 functions: one is a balancing effect. The two end lead steel pieces 900 of the second traction rope 520 and the third traction rope 530 are respectively fixed on the second rope hanger 800, namely, the traction force of the transmission assisting assembly 400 and the gravity of the weight box 300 act on the second rope hanger 800, so that the oil well polish rod is prevented from being damaged due to unbalanced acting force; secondly, the protection function. Once the second traction rope 520 is disconnected, i.e. no traction force is transmitted to the polish rod of the oil well, the hydraulic sensor of the hydraulic system recognizes the change of the traction force of the main hydraulic cylinder 402, and when the traction force pulling the first traction rope 510 is smaller than the force required to overcome the load of the oil well, the oil pumping operation is stopped, i.e. the polish rod of the oil well and the hydraulic pumping unit without the walking beam are protected.

When the first and

second rope hangers

700 and 800 are provided, the walking-beam-free hydraulic pumping unit further includes a third traction rope 530. Specifically, a crown block 200 is connected to the top of the frame 100. The first traction rope 510 is connected to the power assisting assembly 400 and the first rope hanger 700, wherein the first traction rope 510 is led out from the power assisting assembly 400 and then connected to the lower portion of the first rope hanger 700, or can be clamped on the lower portion of the first rope hanger 700. The second traction rope 520 passes through the crown block 200 to connect the weight box 300 and the second rope hanger 800. The third pulling rope 530 is connected with the first rope hanger 700 and passes through the crown block 200 to be connected with the second rope hanger 800, that is, the middle part of the third pulling rope 530 winds around the upper part of the first rope hanger 700, and the two ends are connected with the second rope hanger 800. In this case, the power assisting assembly 400 pulls the oil well polish rod through the first and third pulling

ropes

510 and 530, and the weight box 300 pulls the oil well polish rod through the second pulling rope 520.

The first rope hanger 700 of the embodiment of the present invention may be provided in at least the following three forms:

form one

As shown in fig. 17 and 18, the first rope hanger 700 includes a first traction pulley 710, a second traction pulley 720, a pulley pin 740, and two gripping blocks 760. Wherein the two clamping blocks 760 clamp the first traction pulley 710 and the second traction pulley 720, the pulley pin 740 supports the first traction pulley 710 and the second traction pulley 720, and the pulley pin 740 mates with the two clamping blocks 760. The pulley pin 740 may be a bolt, in which case the pulley pin 740 passes through the two clamping blocks 760 and the axle centers of the first traction pulley 710 and the second traction pulley 720.

The connection of the first traction rope 510 to the first rope hanger 700 is an articulation. Specifically, the middle portion of the first traction rope 510 is wound around the upper side of the second traction sheave 720, and the middle portion of the third traction rope 530 is wound around the lower side of the first traction sheave 710.

Form two

As shown in fig. 19 and 20, the first rope hanger 700 includes a first traction sheave 710, a sheave pin 740, a traction bolt 750, and two clamp blocks 760. Wherein, the lower portion of the clamping block 760 is provided with a first traction groove 730. When the two clamping blocks 760 are coupled and fixed by the pulling bolts 750, the two first pulling grooves 730 form slots for receiving the plumbing fixture 900 at the ends of the first pulling rope 510 to clamp the first pulling rope 510.

In particular, the first traction groove 730 may comprise a first rope groove 731 and a first circular groove 732, wherein the first circular groove 732 is arranged on the upper side of the first rope groove 731, and the width of the first circular groove 732 is larger than the width of the first rope groove 731. One end of the first traction rope 510 is connected with the steel member 900 with a lead, so that the first traction rope 510 passes through the two first rope grooves 731, and the steel member 900 with a lead of the first traction rope 510 is located in the two first circular grooves 732. The first traction sheave 710 is attached to the upper portion of the gripping blocks 760 by sheave pins 740, i.e., the sheave pins 740 support the first traction sheave 710, and either ends of the sheave pins 740 are attached to the upper portions of the two gripping blocks 760 or the sheave pins 740 pass through the upper portions of the two gripping blocks 760. The middle of the third traction rope 530 is wound around the lower side of the first traction sheave 710.

Form III

As shown in fig. 21 and 22, an arc-shaped block 770 is connected to an upper portion of the first rope hanger 700, and a first drawing groove 730 is provided to a lower portion of the first rope hanger 700. An arc-shaped groove is formed between the upper part of the first rope hanger 700 and the arc-shaped block 770, and the arc-shaped groove receives the third traction rope 530, namely, the third traction rope 530 is connected with the first rope hanger 700, and the middle part of the third traction rope 530 is positioned in the arc-shaped groove.

The connection of the first traction rope 510 to the first rope hanger 700 is an articulation. In particular, the first traction groove 730 comprises a first rope groove 731 and a first circular groove 732, the first circular groove 732 being arranged on the upper side of the first rope groove 731, and the diameter of the first circular groove 732 being larger than the diameter of the first rope groove 731. A plumbing member 900 is attached to one end of the first traction rope 510 such that the first traction rope 510 passes through the first rope groove 731, and the plumbing member 900 (not shown) is attached in the first circular groove 732.

The second rope hanger 800 of the embodiment of the present invention can be provided in at least the following three forms:

in the first form, as shown in fig. 23 and 24, the second rope hanger 800 includes a clamp 840 and a coupling bolt 850, wherein the clamp 840 is provided with a polished rod hole 860, a traction rope coupling hole 870, and a third traction groove 830.

The two clamping members 840 clamp the oil well polish rod, the third traction rope 530 and the second traction rope 520, the two clamping members 840 are connected by the connecting bolt 850, the positions of the polish rod hole 860, the traction rope connecting hole 870 and the third traction groove 830 of the two clamping members 840 after connection are respectively corresponding, and three holes are formed, wherein the two polish rod holes 860 form closed holes for accommodating the clamped oil well polish rod, the two traction rope connecting holes 870 also form closed holes for accommodating the end part of the clamped third traction rope 530, and the two third traction grooves 830 form side-opened grooves for accommodating the end part of the clamped second traction rope 520.

Polished rod bore 860 is used to connect second polished rod eye 800 with the well polished rod.

The traction rope connection hole 870 is used for connecting the second rope hanger 800 with the third traction rope 530. The hauling rope connecting hole 870 can comprise a rope head hole 871 and a rope body hole 872, wherein the rope head hole 871 is arranged at the lower side of the rope body hole 872, and the diameter of the rope head hole 871 is larger than that of the rope body hole 872. The third pulling rope 530 is movably connected to the second rope hanger 800, and a steel lead 900 (not shown) is connected to an end of the third pulling rope 530, so that the third pulling rope 530 passes through the rope hole 872, and the steel lead 900 of the third pulling rope 530 is located in the rope hole 871.

The third traction groove 830 is used for connecting the second rope hanger 800 with the second traction rope 520. The third traction groove 830 may include a third rope groove 831 and a third circular groove 832, the third circular groove 832 is disposed at a lower side of the third rope groove 831, and a diameter of the third circular groove 832 is greater than a diameter of the third rope groove 831. The end of the second pulling rope 520 is connected with a lead steel 900, the second pulling rope 520 is movably connected with the second rope hanger 800, so that the second pulling rope 520 passes through the third rope groove 831, and meanwhile, the lead steel 900 of the second pulling rope 520 is positioned in the third circular groove 832.

As a preferred embodiment, the polished rod hole 860 is disposed in the middle of the second rope hanger 800, the tow rope connection holes 870 are symmetrically disposed on both sides of the second rope hanger 800, the third tow grooves 830 are symmetrically disposed on both sides of the second rope hanger 800, that is, the tow rope connection holes 870 are symmetrically disposed on both inner sides of the second rope hanger 800, and the third tow grooves 830 are symmetrically disposed on both outer sides of the second rope hanger 800.

In the second form, as shown in fig. 25 and 26, the second polished rod eye 800 is provided with a polished rod connecting groove 810, a second pulling groove 820, and a third pulling groove 830.

The polish rod connection groove 810 is used for connecting the second polished rod eye 800 with the polish rod of the oil well.

The second traction groove 820 is used to connect the second hanger 800 with the third traction rope 530. The second traction groove 820 may include a second rope groove 821 and a second circular groove 822. The second circular groove 822 is provided at a lower side of the second rope groove 821, and the diameter of the second circular groove 822 is larger than that of the second rope groove 821. The third traction rope 530 is movably connected with the second rope hanger 800, and the end of the third traction rope 530 is connected with a lead head steel 900 (not shown in the figure). The third traction rope 530 passes through the second rope groove 821, and the lead steel 900 at the end thereof is positioned in the second circular groove 822.

The third traction groove 830 is used for connecting the second rope hanger 800 with the second traction rope 520. The third traction groove 830 may include a third rope groove 831 and a third circular groove 832, the third circular groove 832 is disposed at a lower side of the third rope groove 831, and a diameter of the third circular groove 832 is greater than a diameter of the third rope groove 831. The end of the second traction rope 520 is connected with a lead steel 900, and the second traction rope 520 is movably connected with the second rope hanger 800. The second traction rope 520 passes through the third rope groove 831, and the lead steel 900 at the end of the second traction rope is positioned in the third circular groove 832.

As a preferred embodiment, the polish rod coupling groove 810 is disposed at the middle of the second rope hanger 800, the second traction grooves 820 are symmetrically disposed at the inner sides of the second rope hanger 800, and the third traction grooves 830 are symmetrically disposed at the outer sides of the second rope hanger 800.

The third and second polished rod eye 800 is provided with a polished rod connection groove 810, a second traction groove 820, and a third traction groove 830. Wherein, the polished rod connecting groove 810 is disposed in the middle of the second polished rod eye 800, and the second traction groove 820 and the third traction groove 830 are disposed at both sides of the polished rod connecting groove 810, respectively. This form is suitable for the case where the single second traction rope 520 and the single first traction rope 510 are connected to the well polish rod. (for one rope hanger, one of the two grooves is used as a first traction rope, the other groove is used as a second traction rope, and the two grooves are symmetrically arranged).

The polished rod connection groove 810 is used to connect the second polished rod eye 800 with the oil well polished rod.

The second traction groove 820 is used to connect the second hanger 800 with the first traction rope 510. The second traction groove 820 may include a second rope groove 821 and a second circular groove 822, the second circular groove 822 is provided at a lower side of the second rope groove 821, and a diameter of the second circular groove 822 is greater than a diameter of the second rope groove 821. The first traction rope 510 is movably connected to the second rope hanger 800, and a lead steel 900 (not shown) is connected to an end of the first traction rope 510, so that the first traction rope 510 passes through the second rope groove 821, and the lead steel 900 of the first traction rope 510 is located in the second circular groove 822.

The third traction groove 830 is used to connect the second rope hanger 800 with the second traction rope 520. The third traction groove 830 may include a third rope groove 831 and a third circular groove 832, the third circular groove 832 is disposed at a lower side of the third rope groove 831, and a diameter of the third circular groove 832 is greater than a diameter of the third rope groove 831. The end of the second pulling rope 520 is connected with a lead steel 900, the second pulling rope 520 is movably connected with the second rope hanger 800, so that the second pulling rope 520 passes through the third rope groove 831, and meanwhile, the lead steel 900 of the second pulling rope 520 is positioned in the third circular groove 832.

In an embodiment of the present invention, the first traction rope 510, the second traction rope 520, and the third traction rope 530 are wire rope bundles. The first traction rope 510, the second traction rope 520, or the third traction rope 530 may be connected to the first hanger 700 or the second hanger 800 through a lead head steel 900.

As shown in fig. 27, the plumbing member 900 includes a cylindrical rope clamp 910, a wedge 920, and a rope screw 930, and a coaxial rope passage hole 911 and a rope expansion hole 912 are provided in the rope clamp 910. The diameter of the wire rope through hole 911 is smaller than the diameter of the wire rope expansion hole 912.

The ends of the wire rope bundles are located in the wire rope through hole 911 and the wire rope expansion hole 912, and after the wire rope bundles pass through the wire rope through hole 911, the wire rope bundles are dispersed in the wire rope expansion hole 912 by using a tool such as a screwdriver. In the steel wire rope expansion hole 912, the end part of the steel wire rope bundle is embedded into the wedge-shaped block 920 along the axis, a plurality of rope head screws 930 are embedded and screwed around the wedge-shaped block 920, meanwhile, melted lead is poured into the steel wire rope expansion hole 912 for gap filling, and finally, the end part of the steel wire rope bundle is sealed by adopting a welding sealing mode.

As shown in fig. 36, a hydraulic system provided in an embodiment of the present invention mainly includes: a reservoir 1311, a hydraulic pump 1320, a function switching valve 1330, a work solenoid valve 1340, a work relief and check valve 1350, a frame lift valve 1360, a first relief and check valve 1371, a second relief and check valve 1372, and a reversing device (not shown).

The hydraulic system of the embodiment of the invention is applied to a non-beam hydraulic pumping unit and provides power for pulling the polish rod of an oil well to extract oil and lifting the frame 100, namely provides power for the main hydraulic cylinder 402, the auxiliary hydraulic cylinder 411 and the lifting hydraulic cylinder 130. The hydraulic pump 1320 is connected between the oil tank 1311 and the function switching valve 1330, and the hydraulic pump 1320 extracts the hydraulic oil from the oil tank 1311 and outputs power. The function switching valve 1330 is used to control the hydraulic pump 1320 to deliver hydraulic oil to the master cylinder 402 or the lift cylinder 130; the function switching valve 1330 is connected to the master cylinder 402 via a work solenoid valve 1340 and a work relief and check valve 1350, and the function switching valve 1330 is connected to the lift cylinder 130 via a frame lift valve 1360, a first relief and check valve 1371, and a second relief and check valve 1372. That is, the hydraulic oil in the oil reservoir 1311 flows to the function switching valve 1330 via the hydraulic pump 1320, and flows to the master cylinder 402 via the work solenoid valve 1340 and the work relief check valve 1350; or to the lift cylinder 130 via the function switching valve 1330, the frame lift valve 1360, the first relief and check valve 1371, or the second relief and check valve 1372. The reversing device is linked with the working electromagnetic valve 1340, specifically, the reversing device can control a preset front-to-point and a preset rear-to-point of the operation of the movable seat 404, and the working electromagnetic valve 1340 switches the working position when the movable seat 404 operates to the preset front-to-point or the preset rear-to-point so as to change the flowing direction of the hydraulic oil.

It should be noted that the above components can be connected by oil pipes and pipe joints. The main hydraulic cylinder 402 and the auxiliary hydraulic cylinder 411 are used for pulling the polish rod of the oil well upwards to perform an upward stroke movement, and the lifting hydraulic cylinder 130 is used for lowering or lifting the frame 100. When the oil circuit of the main hydraulic cylinder 402 or the auxiliary hydraulic cylinder 411 is opened, the oil circuit of the lifting hydraulic cylinder 130 is closed; when the master cylinder 402 or the sub cylinder 411 oil path is closed, the lift cylinder 130 oil path is opened. Further, by adjusting the hydraulic flow rate of working relief check valve 1350 or first relief check valve 1371 or second relief check valve 1372, the extension/contraction speed and the lifting force of master cylinder 402, sub-cylinder 411 and lift cylinder 130 can be changed to different degrees. The adjustment of the working one-way overflow valve 1350 can realize the adjustment of the stroke frequency (i.e. pumping efficiency) and the load of the non-beam hydraulic pumping unit. Meanwhile, the front and rear operating points of the master cylinder 402 can be set manually, i.e., controlled by adjusting the reversing device. The distance that the power assist assembly 400 pulls the well polish rod at a time is set by setting the positions of the predetermined front and rear solstices of the movement of the movable seat 404, thereby adjusting the positions of the upstroke and the downstroke of the walking beam-free hydraulic pumping unit pulling the well polish rod. As a preferred embodiment, the master cylinder 402 and the sub-cylinder 411 are provided as a single-rod single-acting cylinder; the hydraulic lift cylinder 130 is configured as a single rod double acting cylinder.

It should be noted that when the power assisting assembly 400 is horizontally disposed on the base 610, the movable seat 404 moves to a predetermined front-end point and a predetermined rear-end point; when the power assist assembly is disposed on the frame 100, the movable seat 404 moves to a predetermined upper extreme point and a predetermined lower extreme point.

In the present embodiment, the hydraulic pump 1320 may include a main oil pump 1321, a first motor 1322, a first filter 1323; a secondary oil pump 1324, a second motor 1325, a second filter 1326, a pressure gauge 1327 and a ball valve 1328. The first motor 1322 drives the main oil pump 1321, the main oil pump 1321 is connected to an oil inlet of the function switching valve 1330, and the first filter 1323 is connected between the main oil pump 1321 and a first oil inlet of the oil tank 1311. The second motor 1325 drives the sub oil pump 1324, the sub oil pump 1324 is connected to an oil inlet of the function switching valve 1330, and the second filter 1326 is connected between the sub oil pump 1324 and a second oil inlet of the oil reservoir 1311. The pressure gauge 1327 is connected to the oil outlets of the main oil pump 1321 and the auxiliary oil pump 1324 through a gauge ball valve 1328, and the pressure gauge 1327 is used for measuring the pressure of the oil outlets of the main oil pump 1321 and the auxiliary oil pump 1324 so as to know the operation condition of the hydraulic system in real time.

As an alternative implementation, the hydraulic system of the embodiment of the present invention may include the following components: a reservoir 1311, a hydraulic pump 1320, a function switching valve 1330, a work solenoid valve 1340, a work relief and check valve 1350, a frame lift valve 1360, a first relief and check valve 1371, a second relief and check valve 1372, a cooler 1312, a relief valve 1313, a work switch 1381, a mount switch 1382, a pressure relay (not shown), and a hydraulic pressure sensor (not shown).

The hydraulic pump 1320 is connected between the oil tank 1311 and the function switching valve 1330. The cooler 1312 is connected to oil return ports of the function switching valve 1330, the work solenoid valve 1340, and the rack lift valve 1360. Relief valve 1313 is connected between cooler 1312 and hydraulic pump 1320 (i.e., the oil outlets of main oil pump 1321 and auxiliary oil pump 1324). A first oil outlet of the function switching valve 1330 is connected to the working solenoid valve 1340 and the working check relief valve 1350 in sequence, a working switch 1381 is connected between the working check relief valve 1350 and the main hydraulic cylinder 402, and a mounting switch 1382 is connected between the working check relief valve 1350 and the auxiliary hydraulic cylinder 411. Meanwhile, a frame lift valve 1360, a first one-way relief valve 1371 and a second one-way relief valve 1372 are sequentially connected between the second oil outlet of the function switching valve 1330 and the lift cylinder 130. The reversing device is linked with the working electromagnetic valve 1340. The pressure relay is arranged at an oil inlet of the working solenoid valve 1340 and is linked with the first motor 1322 and the second motor 1325. The pressure relay can measure the pressure at the oil inlet of the working solenoid valve 1340, and when the pressure at the oil inlet of the working solenoid valve 1340 is smaller than a threshold value and exceeds a preset time, the first motor 1322 stops and the second motor 1325 works. Wherein, two sets of running devices carry out one set of operation and another set of reserve, when one set of them breaks down, another set of automatic operation. That is, the sensor identifies the great change of the traction force of the main hydraulic cylinder 402, so as to determine to start the set of machine set to run.

It should be noted that the working switch 1381 is used to control whether the oil path of the master cylinder 402 is conducted or not, the mounting switch 1382 is used to control whether the oil path of the auxiliary cylinder 411 is conducted or not, and how the master cylinder 402 and the auxiliary cylinder 411 are used when the walking-beam-free hydraulic pumping unit is operated can be controlled through the working switch 1381 and the mounting switch 1382. In addition, when a hydraulic system works, pressure loss, volume loss and a plurality of mechanical losses of hydraulic oil are basically converted into heat energy, the temperature of the hydraulic oil is also increased, the hydraulic oil is deteriorated due to overhigh oil temperature, a rubber sealing ring in a pipeline is invalid or the pipeline is aged, and gaps are reduced and blocked due to different thermal expansion coefficients of moving parts; in addition, since the increase of the oil temperature reduces the viscosity of the oil, which increases the possibility of leakage and reduces the efficiency of the entire hydraulic system, the oil temperature of the hydraulic system is generally maintained between-40 ℃ and +60 ℃, for example, the cooler 1312 is set to be started to reduce the temperature above 40 ℃, the hydraulic oil is controlled below 40 ℃, and low-temperature or ultra-low-temperature hydraulic oil is used or heat preservation oil is adopted when the temperature is below 10 ℃.

In an embodiment of the present invention, the operation solenoid valve 1340 may be a three-position four-way solenoid directional valve, which is an automated basic element for controlling fluid used in an industrial control system to adjust the direction, flow rate, speed, and other parameters of a medium. The function switching valve 1330 and the gantry lift valve 1360 are three-position, four-way, manual directional valves. The meter ball valve 1328, the operating switch 1381 and the mounting switch 1382 are manual ball valves, and the manual ball valve is a valve, a closing element of the manual ball valve is a sphere, the sphere rotates around the center line of a valve body to achieve the opening and closing of the valve, and the ball valve is mainly used for cutting, distributing and changing the flowing direction of media in a pipeline. Work relief check valve 1350, first relief check valve 1371 and second relief check valve 1372 are relief check valves, and the relief check valve includes overflow valve and check valve, and its effect is: one direction is straight (the overflow valve is not in work, the one-way valve is straight), and the other direction is overflow (the one-way valve is reverse, is not in work, and the overflow valve is in work). And the main oil pump 1321 and the sub oil pump 1324 may be selected from a gear pump, a vane pump, a plunger pump, or the like.

When the three-position four-way manual directional control valve is used as the function switching valve 1330, the working positions of the function switching valve 1330 include a right position, a middle position and a left position, and the function switching valve 1330 includes an oil inlet, an oil return port and two oil outlets (i.e., a first oil outlet and a second oil outlet), the first oil outlet of the function switching valve 1330 is connected to the oil inlet of the working solenoid valve 1340, and the second oil outlet of the function switching valve 1330 is connected to the oil inlet of the frame lift valve 1360. When the operation position of the function switching valve 1330 is the neutral position, the oil passage is cut off. When the operation position of the function switching valve 1330 is the right position, the hydraulic oil pumped from the oil tank 1311 by the hydraulic pump 1320 flows to the operation solenoid valve 1340 or the like through the first oil outlet of the function switching valve 1330. When the operation position of the function switching valve 1330 is the left position, the hydraulic oil pumped from the oil tank 1311 by the hydraulic pump 1320 flows to the frame lift valve 1360 and the like through the second oil outlet of the function switching valve 1330.

When the three-position four-way electromagnetic directional valve is selected as the working electromagnetic valve 1340, the working positions of the working electromagnetic valve 1340 include a right position, a middle position and a left position, an oil inlet and an oil return port. When the working position of the working solenoid valve 1340 is the neutral position, the oil path is cut off. When the working position of the working solenoid valve 1340 is the right position, the hydraulic oil flowing out of the first oil outlet of the function switching valve 1330 flows to the lower chambers of the main hydraulic cylinder 402 and/or the auxiliary hydraulic cylinder 411 through the working solenoid valve 1340, the check valve of the working check relief valve 1350, the working switch 1381 and/or the mounting switch 1382, and pushes the hydraulic cylinders to operate. When the working position of the working solenoid valve 1340 is left, the hydraulic oil in the lower chamber of the master cylinder 402 and/or the slave cylinder 411 flows to the oil tank 1311 through the working switch 1381 and/or the attaching switch 1382, the relief valve of the working relief valve 1350, and the oil return port of the working solenoid valve 1340.

Specifically, the method comprises the following steps:

when the working position of the function switching valve 1330 is the right position, the working position of the working solenoid valve 1340 is the right position, and the working switch 1381 and/or the mounting switch 1382 are opened, the hydraulic oil flows into the working solenoid valve 1340 from the function switching valve 1330, and then flows into the lower chamber of the main hydraulic cylinder 402 and/or the auxiliary hydraulic cylinder 411 through the one-way valve of the working one-way overflow valve 1350, that is, the piston rod of the main hydraulic cylinder 402 and/or the auxiliary hydraulic cylinder 411 is pushed to extend, and the polish rod of the oil well performs an upper stroke movement;

when the working position of the function switching valve 1330 is the right position, the working position of the working solenoid valve 1340 is the left position, and the working switch 1381 and/or the mounting switch 1382 are/is opened, the hydraulic oil flows back to the working one-way overflow valve 1350 from the lower chamber of the master cylinder 402 and/or the auxiliary hydraulic cylinder 411 and flows into the oil storage tank 1311 through the working solenoid valve 1340, that is, the oil well polish rod makes a downstroke motion by the contraction of the piston rod of the master cylinder 402 and/or the auxiliary hydraulic cylinder 411;

when the working position of the function switching valve 1330 is left and the working position of the rack lift valve 1360 is right, the hydraulic oil flows from the function switching valve 1330 to the rack lift valve 1360, and then flows into the lower chamber of the lift cylinder 130 through the check valve of the first check relief valve 1371, so as to cause the piston rod of the lift cylinder 130 to continuously extend, thereby pushing the rack 100 to gradually rise; at the same time, hydraulic fluid in the upper chamber of the hydraulic lift cylinder 130 is forced to flow through the relief valve of the second one-way relief valve 1372 and the frame lift valve 1360 into the reservoir 1311. I.e. the gantry 100 is raised;

when the working position of the function switching valve 1330 is left and the working position of the rack lift valve 1360 is left, hydraulic oil flows into the check valve of the second one-way relief valve 1372 from the function switching valve 1330 through the rack lift valve 1360, flows to the upper chamber of the lift cylinder 130, and causes the piston rod of the lift cylinder 130 to be continuously contracted, thereby pulling the rack 100 to gradually fall sideways; at the same time, hydraulic fluid in the lower chamber of the hydraulic lift cylinder 130 is forced to flow through the relief valve of the first one-way relief valve 1371 and then through the frame lift valve 1360 to the tank 1311. I.e., the rack 100 is laid down.

In addition, the embodiment of the invention also provides a walking-beam-free hydraulic pumping unit which is provided with the hydraulic system of the embodiment of the invention, and the walking-beam-free hydraulic pumping unit further comprises a rack 100, a lifting hydraulic cylinder 130, an overhead traveling crane 200, a weight box 300, a power assisting assembly 400, a first traction rope 510, a second traction rope 520, a base 610 and an electric control system 630.

The working process of the non-beam hydraulic pumping unit is as follows: the electric control system 630 controls the hydraulic system to start, the first motor 1322 or the second motor 1325 starts to drive the main oil pump 1321 or the auxiliary oil pump 1324 to work, hydraulic oil enters the main hydraulic cylinder 402, the auxiliary hydraulic cylinder 411 or the lifting hydraulic cylinder 130 through a valve body pipeline and a series of hydraulic components such as an oil filter (namely, the first filter 1323 or the second filter 1326), related valves and the like, and the main hydraulic cylinder 402, the auxiliary hydraulic cylinder 411 or the lifting hydraulic cylinder 130 starts to work, so that different work of the walking beam-free hydraulic pumping unit is realized.

Specifically, before the hydraulic system of the walking-beam-free hydraulic pumping unit is started, the function switching valve 1330, the working solenoid valve 1340 and the rack lift valve 1360 are all located at the neutral position, and the work of the hydraulic system mainly includes the following three parts:

first, taking off and landing of the frame 100

1. The gantry 100 is raised:

firstly, checking various preparation works and confirming that the preparation works are correct; starting the electric control system 630, and operating the hydraulic system; then, the working position of the function switching valve 1330 is switched to the left position, the working position of the rack lift valve 1360 is switched to the right position, and the operating system is converted into a manual operating system; the first motor 1322 or the second motor 1325 operates to drive the main oil pump 1321 or the auxiliary oil pump 1324 to operate, hydraulic oil in the oil storage tank 1311 is sucked by the main oil pump 1321 or the auxiliary oil pump 1324, and flows into the lower chamber of the lifting hydraulic cylinder 130 sequentially through the left position of the function switching valve 1330, the right position of the rack lifting valve 1360 and the one-way valve of the first one-way overflow valve 1371, so as to push the piston rod of the lifting hydraulic cylinder 130 to gradually extend; the piston rod of the lifting hydraulic cylinder 130 is pushed to extend along with the hydraulic oil; the hydraulic oil in the upper chamber of the hydraulic cylinder 130 is forced to flow to the cooler 1312 through the overflow valve of the second one-way overflow valve 1372 and the rack lift valve 1360, and finally flows into the oil storage tank 1311, and when the rack 100 is lifted to a predetermined position (i.e., attached to the base 610), the working position of the rack lift valve 1360 is switched to the middle position, the working position of the function switching valve 1330 is switched to the middle position, and the manual operation system is closed, thereby completing the lifting operation of the rack body.

It is noted that the carriage rise speed may be controlled by the relief valve of the second relief check valve 1372.

2. The frame 100 is placed upside down: firstly, checking various preparation works and confirming that the preparation works are correct; starting an electric control system 630 and a hydraulic system to work; then, the working position of the function switching valve 1330 is switched to the left position, the working position of the rack lift valve 1360 is switched to the left position, and the operating system is converted into a manual operating system; the first motor 1322 or the second motor 1325 operates to drive the main oil pump 1321 or the auxiliary oil pump 1324 to work, the hydraulic oil in the oil storage tank 1311 is sucked by the main oil pump 1321 or the auxiliary oil pump 1324, and the hydraulic oil flows into the upper chamber of the lifting hydraulic cylinder 130 through the left position of the function switching valve 1330, the left position of the rack lifting valve 1360 and the check valve of the second one-way overflow valve 1372 in sequence to force the piston rod of the lifting hydraulic cylinder 130 to contract; as the piston rod of the hydraulic lift cylinder 130 retracts; the hydraulic oil pushing the lower chamber of the hydraulic cylinder 130 flows through the relief valve of the first one-way relief valve 1371, the frame lift valve 1360, to the cooler 1312, and finally flows back to the oil tank 1311, after the frame 100 is tilted to a predetermined position (i.e., tilted on the bracket 620). The working position of the frame lifting valve 1360 is switched to the middle position, the working position of the function switching valve 1330 is switched to the middle position, the manual operation system is closed, and the frame body inverting work is completed.

It should be noted that the frame body falling speed can be controlled by controlling the overflow valve of the first one-way overflow valve 1371;

second, mount operation

Firstly, a 410 cushion block is arranged at a piston rod head of an auxiliary hydraulic cylinder 411 and is connected with a movable seat 404; and secondly, connecting with an oil well polish rod. Namely, after the first traction rope 510 is connected with the first rope hanger 700, the third traction rope 530 is connected with the first rope hanger 700, the first traction rope passes through a lead steel piece 900 at two ends of the crown block and is respectively connected with the second rope hanger 800 and the oil well polish rod (the polish rod is locked by a square clamp and is arranged above the second rope hanger 800), and the second traction rope 520 passes through a lead steel piece 900 at two ends of the crown block and is connected with the second rope hanger 800 and the oil well polish rod (the middle part of the second traction rope 520 is hung on the upper part of the weight box 300); again, the stroke is adjusted. The stroke is adjusted according to the data provided by the oil well (namely, the positions of an upper limit switch and a lower limit switch of the reversing device are adjusted); then, checking each preparation work, and determining the safety without errors; starting the electric control system 630 and the hydraulic system to operate; the operating switch 1381 and the mounting switch 1382 are turned on, the operating system is converted into a manual operating system, the operating position of the function switching valve 1330 is switched to the right position, and the operating position of the operating solenoid valve 1340 is switched to the right position; the first motor 1322 or the second motor 1325 operates to drive the main oil pump 1321 or the sub-oil pump 1324 to operate, so that the hydraulic oil in the oil storage tank 1311 is sucked in through the main oil pump 1321 or the sub-oil pump 1324, the hydraulic oil sequentially flows to the lower chambers of the main hydraulic cylinder 402 and the sub-hydraulic cylinder 411 through the right position of the function switching valve 1330, the right position of the working electromagnetic valve 1340 and the one-way valve of the working one-way relief valve 1350, the piston rods of the main hydraulic cylinder 402 and the sub-hydraulic cylinder 411 are pushed to extend, the movable seat 404 is pushed to move forward to a pre-reach point, namely, the first traction rope 510 drives the third traction rope 530 to pull the polish rod of the oil well to rise, when the movable seat 404 reaches the pre-reach a preset point and the polish rod of the oil well rises to a preset position, namely, when the middle part of the second traction rope 520 can be connected with the connecting wheel 340, the working electromagnetic valve 1340 is operated to switch the, the pin shaft 330 is arranged and fixedly connected with the pin shaft; after the check is correct, the working position of the working electromagnetic valve 1340 is switched to the right position, the polish rod of the oil well is pulled upwards slightly, the movable seat 404 is controlled to change the direction of a preset up-to-point reversing device, the hydraulic system of the oil well does not give power to the main hydraulic cylinder 402 and the auxiliary hydraulic cylinder 411 any more, the load of the polish rod of the oil well is larger than the sum of the gravity of the weight box 300 and the hydraulic return force of the hydraulic system, the polish rod of the oil well runs downwards, the movable seat 404 runs downwards at a pre-to-point, and the polish rod of the oil well moves downwards at a down; when the polish rod of the oil well runs to a lower pre-arrival point, the working position of the working electromagnetic valve 1340 is switched to a middle position, the mounting switch 1382 is closed, and the 410 cushion block arranged on the piston rod of the auxiliary hydraulic cylinder 411 is dismounted to ensure that the cushion block is not connected with the movable seat 404 any more; then, after the inspection is carried out without errors; switching the working position of the working electromagnetic valve 1340 to the right position, closing the manual operation system, and switching the operation system to the automatic system of the electric control system 630; the hydraulic system continues to operate normally, pushes the movable seat 404 to move to the forward pre-dead point after reversing, and the walking-beam-free hydraulic pumping unit operates to pump oil, namely, the mounting work is completed.

Third, oil recovery operation

Firstly, completing the mounting process, checking various preparation works, and confirming that the preparation works are correct; the electric control system 630 is started, the hydraulic system operates along with the electric control system 630, then the function switching valve 1330 is switched to the right position, the working electromagnetic valve 1340 is switched to the right position, and the working switch 1381 is opened; switching the operating system to an automatic operating system; the first motor 1322 or the second motor 1325 operates to drive the main oil pump 1321 or the sub-oil pump 1324 to operate, so that the hydraulic oil in the oil storage tank 1311 is sucked by the main oil pump 1321 or the sub-oil pump 1324, the hydraulic oil flows to the lower chamber of the main hydraulic cylinder 402 from the right position of the function switching valve 1330, the right position of the working electromagnetic valve 1340 and the one-way valve of the working one-way overflow valve 1350 in sequence, the piston rod of the main hydraulic cylinder 402 is pushed to extend, the movable seat 404 is pushed to move towards the pre-arrival point, namely, the first traction rope 510 drives the third traction rope 530 to pull the polish rod of the oil well to rise, and meanwhile, the weight box 300 directly pulls the polish rod of the oil well to move upwards through the second traction rope 520 from the upper part of; when the main hydraulic cylinder 402 pushes the movable seat 404 to move to a preset upper limit, the reversing device is linked with the working solenoid valve 1340, the working solenoid valve 1340 switches the working position to the left position, when the hydraulic system does not give output power to the main hydraulic cylinder 402 any more, namely the first traction rope 510 is linked with the third traction rope 530 to not give pulling force to the polish rod of the oil well, the load of the polish rod of the oil well is larger than the sum of the gravity of the weight box 300 and the hydraulic return force of the hydraulic system, the polish rod of the oil well makes a down stroke movement, the weight box 300 is pulled to move from the lower part of the rack 100 to the upper part of the rack 100, the piston rod of the main hydraulic cylinder 402 contracts, and at the moment, the hydraulic oil in the lower chamber of the main hydraulic cylinder 402 flows back to the oil storage tank 1311. When the piston rod of the master cylinder 402 contracts and the movable seat 404 moves to a predetermined backward reaching point, the reversing device is linked with the working solenoid valve 1340; the working solenoid valve 1340 switches the working position to the right position again, the movable seat 404 moves forwards to the pre-reaching point, the hauling rope pulls the polish rod of the oil well to perform the upstroke … …, and the reciprocating motion enables the walking-beam-free hydraulic pumping unit to finish the pumping work.

It should be noted that, when the walking-beam-free hydraulic pumping unit is in a standby state, the working positions of the function switching valve 1330, the working solenoid valve 1340 and the rack lift valve 1360 are all neutral positions (i.e., stop positions).

According to the above description, it can be seen that the walking-beam-free hydraulic pumping unit of the embodiment of the present invention has at least the following advantages or benefits:

1. the hydraulic transmission mode is adopted to convert the mechanical energy of the high-speed rotation of the motor into hydraulic energy through the hydraulic pump, and the hydraulic pressure is used as a power transmission mode, so that the hydraulic transmission device has the advantages of simple structure, reliable work and stable motion;

2. the boosting assembly 400 drives the third traction rope 530 and the counterweight box 300 and the second traction rope 520 to simultaneously and directly pull the polish rod of the oil well through the first traction rope 510, and the sum of the traction force of the boosting assembly 400 and the gravity of the counterweight box 300 is greater than the load of the polish rod of the oil well, so that the oil pumping work can be completed, the power is reasonably utilized, and the energy-saving effect is obvious;

3. the load and the stroke frequency are adjusted by adjusting the hydraulic pressure or the flow rate of the hydraulic system, so that the suspension point load can be increased, and the stroke frequency can be increased. Meanwhile, the speeds of the upper stroke and the lower stroke can be separately adjusted; the tower frame type structure increases the stroke, and is easy to operate with long stroke and low stroke frequency; therefore, the walking-beam-free hydraulic pumping unit has wider application range and can be applied to heavy oil wells, thin oil wells and deep oil wells with different types or different strokes and the like with different load requirements;

5. the design of the balance type crown block 200 is adopted in the non-beam hydraulic pumping unit, and the stability of the top of the frame 100 is improved. Meanwhile, the roller 260 of the crown block 200 increases the contact area with the second traction rope 520 and the third traction rope 530, so that the oil pumping process is more stable. In addition, the whole machine yield can be adjusted, and the reliability of well workover yield is ensured;

6. the fixed pulley block 405, the movable pulley block 406 and the auxiliary hydraulic cylinder 411 of the boosting assembly 400 can be flexibly adjusted, so that the walking-beam-free hydraulic pumping unit has a double-stroke function, and is high in mounting capacity and loading capacity;

7. the non-beam hydraulic pumping unit adopts the electromechanical and hydraulic integration, thereby being convenient for realizing automatic control and remote control;

8. the preset upper-most point and the preset lower-most point of the operation of the movable seat 404 can be set manually, that is, the positions of the preset upper-most point and the preset lower-most point of the reversing device are adjusted within a certain range, so that the distance for pulling the traction rope by the power-assisted assembly 400 each time can be changed, and the distance of the upper stroke and the lower stroke of the walking-beam-free hydraulic pumping unit can be adjusted;

9. the movable seat 404 of the boosting assembly 400 slides along the track 407 through the first bearing 409 and the second bearing 413, so that the friction force between the movable seat 404 and the track 407 is reduced, and the service life is prolonged; but also enhances the traction efficiency of the main hydraulic cylinder 402, namely, the oil pumping efficiency is improved;

10. the frame 100 can be laid down without disassembling other structures of the non-beam hydraulic pumping unit through the lifting hydraulic cylinder 130, so that the difficulty of operations such as installation, maintenance and the like is reduced;

11. the first polished rod eye 700 functions: the first is the conversion: that is, the first pulling rope 510 and the third pulling rope 530 are connected by the first rope hanger 700, and the pulling force of the first pulling rope 510 is applied to the oil well polish rod from the third pulling rope 530 through the first rope hanger 700; secondly, the oil well polish rod is protected, once the first traction rope 530 is broken, the first traction rope 510 and the third traction rope 530 are immediately discharged through the first rope hanger 700, and the oil well polish rod lacks enough traction acting force (the gravity of the weight box 300 is smaller than the load of the oil well polish rod) and falls to a lower pre-stopping point so as to achieve the purpose of protecting the oil well polish rod;

12. the second rope hanger 800 can transmit the traction force of the boosting assembly 400 and the traction force formed by the gravity of the weight box 300, so that two acting forces uniformly act on the polish rod of the oil well;

13. the sliding assembly 1000 on the side surface of the weight box 300 can slide along the vertical direction of the rack 100, so that the friction force applied to the weight box 300 during sliding in the vertical direction is smaller, and the sliding process is smoother;

14. the brake assembly 1100 is used as an emergency measure, and the friction force generated by the brake assembly 1100 and the frame body of the rack 100 can brake or slowly fall the weight box 300 when the second traction rope 520 is broken, so that the weight box 300 is prevented from freely falling to damage the rack 100 and other components;

15. the buffer assembly 1200 can reduce the impact of the weight box 300 on the bottom of the rack 100, reduce the damage to the machine body when the weight box 300 falls freely, and increase the safety factor;

16. the expansion and contraction speeds of the main hydraulic cylinder 402, the auxiliary hydraulic cylinder 411 or the lifting hydraulic cylinder 130 can be changed to different degrees by adjusting the hydraulic flow of the working one-way overflow valve 1350, the first one-way overflow valve 1371 or the second one-way overflow valve 1372, so that the stroke frequency (namely the pumping efficiency) of the walking-beam-free hydraulic pumping unit or the stable lifting or falling of the frame 100 can be realized;

17. the hydraulic system is provided with two sets of motors and oil pumps, wherein one set of motors and oil pumps runs and the other set of motors and oil pumps are standby, and when one set of motors and oil pumps breaks down, the other set of motors and oil pumps automatically run, so that the continuous running capacity of the hydraulic system is improved;

18. the height of the frame 100 can be freely set, the stroke is increased by the tower structure, and the stroke frequency is reduced, so that the fatigue degree of the sucker rod is reduced, the service life of the sucker rod is prolonged, the suction rate of the oil pumping unit is reduced, and the oil pumping rate is improved.

The invention is not limited to the above preferred embodiments, but includes all modifications, equivalents, and simplifications that may be made by those skilled in the art without departing from the spirit of the invention.

Claims

1. The utility model provides a no beam-pumping unit of walking beam formula hydraulic pressure which characterized in that, includes frame (100), overhead traveling crane (200), weight box (300), helping hand subassembly (400), first haulage rope (510) and second haulage rope (520), wherein:

the top of the frame (100) is connected with the overhead travelling crane (200);

the first traction rope (510) penetrates through the overhead crane (200), and the first traction rope (510) is connected with the power-assisted assembly (400) and an oil well polished rod;

the power-assisted assembly (400) is transversely arranged and is adjacent to the rack (100), and the power-assisted assembly (400) is used for pulling an oil well polish rod;

the second traction rope (520) penetrates through the overhead crane (200), and the second traction rope (520) is connected with the weight box (300) and an oil well polish rod;

the weight box (300) is movable in a vertical direction along the machine frame (100).

2. The walking-beam-free hydraulic pumping unit according to claim 1, wherein the crown block (200) comprises a support frame (210), a first pulley (220), a second pulley (230), a third pulley (240) and a pulley seat (250), wherein:

the first pulley (220) is connected with the supporting frame (210) through the pulley seat (250), and the first pulley (220) is positioned on one side of the supporting frame (210) close to the power assisting assembly (400);

the second pulley (230) is connected with the supporting frame (210) through the pulley seat (250), and the second pulley (230) is positioned above the weight box (300);

the third pulley (240) is connected with the supporting frame (210) through the pulley seat (250), and the third pulley (240) is positioned on one side of the supporting frame (210) close to the polish rod of the oil well;

the first traction rope (510) is sequentially wound on the upper parts of the first pulley (220) and the third pulley (240);

the second traction rope (520) is wound on the upper parts of the second pulley (230) and the third pulley (240) in sequence; .

3. The walking-beam-free hydraulic pumping unit according to claim 2, wherein the head truck (200) further comprises at least one roller (260) and a roller seat (270), wherein:

the peripheral surface of the roller (260) is provided with a rope groove which is used for being matched with the first traction rope (510) and/or the second traction rope (520);

the roller seat (270) is arranged on the inner side of the support frame (210);

the roller (260) is connected to the roller seat (270), and the roller (260) is positioned above the first pulley (220) and the third pulley (240) and/or above the second pulley (230) and the third pulley (240);

the first traction rope (510) is sequentially wound on the upper parts of the first pulley (220), the roller (260) and the third pulley (240); and/or

The second traction rope (520) is sequentially wound around the second pulley (230), the roller (260) and the upper part of the third pulley (240).

4. The walking-beam-free hydraulic pumping unit according to claim 2, further comprising a hydraulic lifting cylinder (130), a base (610), a bracket (620), an electric control system (630) and a safety fence, wherein the frame (100) comprises at least one steel structure (110) arranged as a hexahedral frame, and wherein:

the connected steel structures (110) are movably or fixedly connected, a fixed channel is arranged in each steel structure (110), and the weight box (300) can move up and down in the fixed channel;

one side of the lower end of the steel structure (110) at the lowest end is hinged with the base (610), and the other side of the lower end is movably connected with the base (610);

two ends of the lifting hydraulic cylinder (130) are respectively connected with the steel structure (110) at the middle lower part and the base (610);

the bracket (620) is arranged at the end part of the base (610), and the bracket (620) is used for supporting the frame (100) when the frame (100) is laterally overturned;

the electric control system (630) is arranged on the base (610), and the electric control system (630) is used for controlling the power assisting assembly (400) and the lifting hydraulic cylinder (130) and providing power supply and protection;

the safety barrier is located at the edge of the base (610).

5. The walking-beam-free hydraulic pumping unit according to claim 4, wherein the boosting assembly (400) comprises a main hydraulic cylinder (402), a fixed seat (403), a movable seat (404), a fixed pulley block (405), a movable pulley block (406), a rail (407) and a wedge joint (408), wherein:

the track (407) and the fixed seat (403) are respectively connected to the base (610); the end part of the track (407) is connected with the fixed seat (403);

the movable seat (404) supports the movable pulley block (406), and the movable seat (404) is in sliding fit with the track (407);

the fixed seat (403) supports the fixed pulley block (405);

the main hydraulic cylinder (402) is arranged between the fixed seat (403) and the movable seat (404);

the wedge-shaped joint (408) is hinged to the side surface of the fixed seat (403), and the wedge-shaped joint (408) is used for fixing one end of the first traction rope (510).

6. The walking-beam-free hydraulic pumping unit according to claim 5, wherein the boosting assembly (400) further comprises a first bearing (409), a spacer (410), a secondary hydraulic cylinder (411), a second bearing (413) and a reversing device, the rail (407) is a channel steel, wherein:

the end part of the movable seat (404) is connected with the first bearing (409) which is longitudinally arranged and the second bearing (413) which is transversely arranged; the first bearing (409) is in sliding fit with the inner top surface and/or the inner bottom surface of the rail (407); the second bearing (413) is in sliding fit with the inner side surface of the track (407);

the auxiliary hydraulic cylinder (411) is arranged between the fixed seat (403) and the movable seat (404);

the cushion block (410) is movably arranged between a piston rod of the auxiliary hydraulic cylinder (411) and the movable seat (404);

two limit switches of the reversing device are respectively arranged on the track (407).

7. The walking-beam-free hydraulic pumping unit according to claim 5, wherein the fixed base (403) is provided with a wedge joint (408) at the side, the fixed pulley block (405) comprises at least two fixed pulleys, the movable pulley block (406) comprises at least two movable pulleys, and the crown block (200) is provided with one of the first pulleys (220), at least one of the second pulleys (230) and at least two of the third pulleys (240), wherein:

one end of the first pull-cord (510) is connected to the wedge adapter (408); the rope body of the first traction rope (510) is wound from the position close to the wedge-shaped joint (408) to the upper part of the movable pulley and the lower part of the fixed pulley far away from the wedge-shaped joint (408) in sequence and is wound on the upper parts of the first pulley (220) and one of the third pulleys (240); the other end of the first traction rope (510) is connected to an oil well polish rod;

one end of the second traction rope (520) is connected to the weight box (300); the rope body of the second traction rope (520) is wound on the upper parts of the second pulley (230) and the other third pulley (240) in sequence; the other end of the second traction rope (520) is connected to the polish rod of the oil well; or

The middle part of the second traction rope (520) is connected to the weight box (300); two side rope bodies of the second traction rope (520) are respectively wound on the upper parts of the two second pulleys (230) and the other two third pulleys (240) in sequence; and two ends of the second traction rope (520) are connected to the polish rod of the oil well.

8. The walking-beam-free hydraulic pumping unit according to claim 5, wherein the wedge joint (408) is disposed on each side of the fixed base (403), the fixed pulley block (405) comprises at least two fixed pulleys, the movable pulley block (406) comprises at least two movable pulleys, and the crown block (200) is provided with two of the first pulleys (220), at least one of the second pulleys (230), and at least three of the third pulleys (240), wherein:

the middle part of the first traction rope (510) is connected with an oil well polish rod; two side rope bodies of the first traction rope (510) are respectively and sequentially wound on the third pulley (240) and the upper part of the first pulley (220), and are respectively and sequentially wound from the middle part of the power assisting assembly (400) to the upper part of the movable pulley and the lower part of the fixed pulley close to the wedge-shaped joint (408); two ends of the first traction rope (510) are respectively connected to the two wedge joints (408);

9. The walking-beam-free hydraulic pumping unit according to any one of claims 1-8, wherein the top of the weight box (300) is provided with a lifting lug (310) and a pin (330) in parallel, wherein:

the lifting lug (310) is connected to the top of the weight box (300);

two ends of the pin shaft (330) are connected with the lifting lug (310); or the pin shaft (330) penetrates through the two lifting lugs (310);

the second traction rope (520) is connected to the pin (330).

10. A walking-beam-free hydraulic pumping unit according to any one of claims 1-9, wherein the top of the weight box (300) is provided with parallel lifting lugs (310) and connecting wheels (340), wherein:

the lifting lug (310) is connected to the top of the weight box (300);

the connecting wheel (340) is connected between the two lifting lugs (310);

the second traction rope (520) is passed around from the underside of the fifth wheel (340).