CN208203237U - Long stroke pumping unit - Google Patents

Abstract

A kind of long stroke pumping unit has pedestal, rack, sucker rod, the first guide rail, the second guide rail, counterweight, sucker rod fall block, counterweight fall block, driving wheel, flexible connecting member, bracket, power drive unit.The top of sucker rod is fixedly connected with the pallet of sucker rod fall block, counterweight is set in the pallet of counterweight fall block, two the first composite track rollers respectively are installed and form pairs of two pair of first composite track roller setting up and down in front and back in the pallet inside front and back of sucker rod fall block, each pair of first composite track roller is respectively arranged in the concave tracks of a pair of first guide rail, two the second composite track rollers respectively are installed and form pairs of two pair of second composite track roller setting up and down in front and back in the pallet inside front and back of counterweight fall block, each pair of second composite track roller is respectively arranged in the concave tracks of a pair of second guide rail.The utility model structure is simple, and stroke is big, and securely and reliably, failure rate is low, energy conservation, long service life.

Description

Long stroke pumping unit

Technical field

The utility model relates to a kind of pumping unit, especially a kind of long stroke pumping unit.

Background technique

Long stroke (non-walking beam) pumping unit at present, has following several: 1. Wide-band type long-stroke, with traditional electricity Machine speed reducer and direct driving motor (similar servo motor)；2. chain type oil pump, main problem is that chain is not durable, because of chain By lateral bending stress.Power is conventional motor with retarder；3. ordinary motor equipped hydraulic pumps drive cylinder long stroke pumping unit, The pumping unit is that piston rod is fixed, cylinder barrel movement, and band movable pulley is mobile.

Inventor retrieves following Patents documents: CN201738896U discloses a kind of long-stroke roller oil pumping unit, It include: pedestal, rack, counter-balanced carriage, motor, driving wheel, transmission belt fixed plate, shaft coupling, retarder.The counter-balanced carriage is by fashioned iron Composition, the counterweight that frame is provided with different weight can accurately adjust balance.The rack is made of H profile steel, is the branch of complete machine Frame is the slideway of counterweight again, keeps structure extremely succinct.Frame lower, which is equipped with hinge, to fold back, and be readily transported.Driving wheel Can front and back fine tuning, so that suspension point is precisely aligned well head and avoid well bar eccentric wear, extend the well workover period.CN201620834U discloses one Various shear connecting rod beamless oil extractors, pedestal lower end position are connected on pedestal, and motor is housed on the pedestal in stand frame, are led to Belt gear to be crossed to connect with retarder, the variable crank on reducer output shaft is connected by connecting rod with groove profile sliding block, Groove profile sliding block two sides are equipped with guide bearing and are connected by push-pull rod with multistage double leval jib transmission mechanism, multistage double leval jib transmission mechanism Upper-end part of driving is equipped with multiple tracks tension spring, and the multiple tracks tension spring other end is fixed with the spring for being fixed on the setting of movable pulley strut upper and lower respectively Bar connects, and there are symmetrical weighting distribution wheel and fixed pulley in cantilever tip position two sides, is carried respectively with suspension point between two wheels by counterweight rope Lotus is connected with counterweight.CN204186353U discloses a kind of two-way more well petroleum extractors of one machine of coaster double-balance, the steel Cord directive wheel is connect by wirerope with sucker rod, and the connecting rod is connected with coaster, and the pulley support of the coaster is in guide rail On, guide rail is fixed on the guide rail bracket, the crank is connect with connecting rod, and the motor is connected with retarder, the counterweight Block is fixed at the top of sucker rod, and the bottom of the frame is fixed in prefabricated concrete foundation by foundation bolt, top carrying There is kinematic system, the oil pumping tree is connected to the bottom of sucker rod.CN1944948A discloses a kind of stroke increased oil pumping machine, by closing Pylon, motor, joined v-belt, belt wheel, Hardened gear face cylindrical gear reducer, crank axle, connecting rod, two lower sprockets, two chains, Coaster, two swelling devices, two upper sprocket wheels, wirerope, front jocket wheel, polished rod eye, crossbeam, brake hub, brake, two rails Road, four rolling, with being reconstructed into.

How the above technology is for making pumping unit accomplish that structure is simple, stroke is big, safe and reliable, low energy consumption, using Service life is long, does not provide specific guidance program.

Summary of the invention

Technical problem to be solved by the utility model is to provide a kind of long stroke pumping units, its structure is simple, stroke Greatly, securely and reliably, failure rate is low, and energy conservation, manufacturing cost is low, long service life.

In order to solve the above technical problems, the technical solution adopted in the utility model is as follows:

A kind of long stroke pumping unit (or perhaps ultra long stroke beam-pumping unit) has pedestal, is fixedly installed on pedestal Rack, sucker rod, its technical solution is that: the long stroke pumping unit also has a pair of the be fixedly installed on the left of rack One guide rail (sliding rail), the second guide rail of a pair (sliding rail) being fixedly installed on the right side of rack, two pair of first composite track roller, two pairs Second composite track roller, sucker rod fall block, counterweight fall block, driving wheel, with the driving wheel matches structure at counterweight The flexible connecting member of kinematic pair, bracket, power drive unit in a pair.The top of the sucker rod and sucker rod fall block Pallet is fixedly connected, and counterweight is set in the pallet of counterweight fall block, each installation in front and back on the inside of the pallet of sucker rod fall block Two the first composite track rollers and form front and back two pair of first composite track roller setting up and down in pairs, each first is compound The mounting means of roller bearing is welding, and specific mounting means is exactly the spindle nose of the first composite track roller and one piece with circle The plate in hole welds, then again with assembly and connection on the inside of the pallet of sucker rod fall block, each pair of first composite track roller Corresponding one by one with the pair of first guide rail, each pair of first composite track roller is respectively arranged in a pair of first guide rail Make a pair of first guide rail to sucker rod fall block guide and limit, the pallet inside front and back of counterweight fall block in concave tracks Two the second composite track rollers respectively are installed and form pairs of two pair of second composite track roller setting up and down in front and back, Mei Ge The mounting means of two composite track rollers is welding, and specific mounting means is exactly the spindle nose of the second composite track roller and one piece The welding of round-meshed plate, then again with assembly and connection on the inside of the pallet of counterweight fall block, each pair of second composite rolling wheel Bearing and the pair of second guide rail are corresponding one by one, and each pair of second composite track roller is respectively arranged in a pair second and leads Make a pair of second guide rail to counterweight fall block guide and limit in the concave tracks of rail.The bracket is mounted on the rack, energy For driving wheel around holder pivots by the bracket limited support, flexible connecting member passes through one end and the pumping of driving wheel and flexible connecting member The pallet of beam hanger fall block is connected, and the other end of flexible connecting member is connected with the pallet of counterweight fall block, and power drives The power output end of dynamic device is connected with the power intake of driving wheel.

In above-mentioned technical proposal, preferred technical solution may is that the driving wheel, flexible connecting member quantity preferably all It is two.Above-mentioned driving wheel can be slot ring antenna, then flexible connecting member is round-link chain, and each slot ring antenna is preferably provided with two Driver slot (two slot ring antennas are provided with four driver slots).Above-mentioned driving wheel can also be roller chain wheel, then flexible connecting member is Roller chain.Specifically roller chain wheel is board-like roller chain wheel, and flexible connecting member is board-like roller chain.Above-mentioned driving wheel is also It can be belt wheel, then flexible connecting member is drive belt, has wire-core in drive belt.Above-mentioned bracket is rack-mounted Specific structure is preferably, the plate that the top of rack is fixedly connected with convenient for operation, which is operating platform, and plate is from rack Front side, rear side, left side extend horizontally outward, jagged with sucker rod fall block corresponding section plate band, that is, pumping The top relative position plate band of bar fall block is jagged, and flexible connecting member is passed through from this notch, and the bracket is fixed on flat The upper surface of plate, bracket can be made of front side longitudinal plate, rear side longitudinal plate, and front side longitudinal plate, rear side longitudinal plate can be distinguished It is mutually neat with the front and rear sides of the frame of rack；Power drive unit can have speed regulating motor and adjust the speed reversing motor (speed regulation tune To motor), planetary reducer, the pedestal of speed regulating motor, the pedestal of planetary reducer are all fixedly mounted on plate Upper surface.Certainly, power drive unit is not limited in several structures stated below the application, and there are many different knots for it Configuration formula.First group of buffer for preventing sucker rod fall block from falling preferably is installed in said base and prevents counterweight from going up and down Second group of buffer that coaster falls, first group of buffer are located at immediately below the pallet of sucker rod fall block, second group of buffering Device is located at immediately below the pallet of counterweight fall block, and first group of buffer and second group of buffer are all several buffering hydraulics Cylinder (for example being all 2 ~ 3 buffering hydraulic cylinders).Each first composite track roller all has main roller, side wheel.Each second Composite track roller all has main roller, side wheel, each first composite track roller and each second composite track roller Structure is identical.Each of described first composite track roller and each second composite track roller can reach special type using Changzhou an ancient unit of weight The composite track roller of bearing Co., Ltd production.

Long stroke pumping unit described in the utility model also has the first guide rail of a pair being fixedly installed on the left of rack, consolidates Dingan County loaded on the right side of rack the second guide rail of a pair, two pair of first composite track roller, two pair of second composite track roller, match Weight, matches the flexibility for constituting a pair of of kinematic pair with the driving wheel at sucker rod fall block, counterweight fall block, driving wheel Connector, bracket, power drive unit.In this way, two tracks and four composite track rollers are constituted on sucker rod fall block The kinematic pair of lower slider, other two track and four additional composite track roller constitute the fortune that counterweight fall block slides up and down Dynamic pair, so that it is guaranteed that two coasters can only move towards to move up and down according to track (sliding rail), i.e. sucker rod fall block is along first Guide rail walks up and down, counterweight fall block walks up and down along the second guide rail, uses sucker rod fall block, counterweight fall block Purpose is so that it is reduced sideshake in order to stablize sucker rod motion profile, effectively guarantees sucker rod traveling comfort, keeps away Exempt from sucker rod to rub by lateral force and with the borehole wall, lead to sucker rod premature failure and damage the borehole wall, extends using the longevity Life works more safe and reliable.The long stroke pumping unit of the utility model, stroke depend on the height and intensity of rack, only Rack is wanted to do sufficiently high, stroke will reach corresponding height, moreover, stroke is longer, driving chain (flexible connecting member) Service life will be longer, the efficiency of oil pumping also will be higher.The utility model structure is simple, and stroke (super) greatly, safely may be used It leans on, failure rate is low (compared with having relevant pumping unit, the utility model failure rate reduces 30% or more), it is easy to maintenance, Light-weight, low energy consumption (compared with having relevant pumping unit, the utility model energy consumption reduces 25% or more), adaptable, whole Machine weight is small, manufactures (compared with having relevant pumping unit, the utility model, which manufactures cost, reduces 28% or more) at low cost, Long service life (compared with having relevant pumping unit, the service life of the utility model extends 30% or more).This is practical new Type can realize mass production, achieve the purpose that energy-efficient.

In conclusion the long stroke pumping unit structure of the utility model is simple, stroke is big (ultra-long-stroke), securely and reliably, Failure rate is low, and maintenance is few, and low energy consumption, and energy conservation, main screw lift is small, and manufacturing cost is low, long service life.

Detailed description of the invention

Fig. 1 is the structural schematic diagram (main view) of the utility model.

Fig. 2 be Fig. 1 in A to view (top view saves computer room 11).

Fig. 3 is that the first guide rail is connected with sucker rod fall block, the lifting of the second guide rail and counterweight is slided in the utility model The structural schematic diagram (top view) that vehicle is connected.

Fig. 4 is the structural schematic diagram that a pair of first composite track roller is matched with a pair of first guide rail in the utility model (top view)；(a) is the structural representation that corresponding first guide rail of first composite track roller matches in Fig. 4 Scheme, (b) is the structural schematic diagram that another first composite track roller is matched with another first guide rail in Fig. 4.

Specific embodiment

To keep the goal of the invention, technical solution and advantage of the utility model clearer, below in conjunction with embodiment to this The technical solution of utility model carries out clear, complete description.Obviously, described embodiment is that the utility model a part is real Apply example, and not all embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creation Property labour under the premise of every other embodiment obtained, fall within the protection scope of the utility model.

Embodiment 1: as shown in Figure 1, Figure 2, Figure 3, Figure 4, long stroke pumping unit described in the utility model has pedestal ( Base) 4, the rack 8 that is fixedly installed on pedestal, sucker rod 1,802 and of the first guide rail of a pair for being fixedly installed in 8 left side of rack 802 ', 803 and 803 ', two couples of 201 and of the first composite track roller of the second guide rail of a pair on 8 right side of rack are fixedly installed in 201 ', two pair of second composite track roller 601 and 601 ', counterweight 7, sucker rod fall block 2, counterweight fall block 6, driving wheel 9, flexible connecting member 9 ', bracket 10, the power drive unit (power source) for constituting a pair of of kinematic pair are matched with the driving wheel 14.Rack 8 has frame 800, has reinforcing rib 801 on frame 800.First guide rail 802 and 802 ', 803 and of the second guide rail 803 ' are fixed as one with rack 8, are in integral structure, i.e. four two pairs of sliding rails and frame, reinforcing rib form rack 8. The top (passing through dixie grip 12) of the sucker rod 1 is fixedly connected with the pallet of sucker rod fall block 2, and counterweight 7 is set In in the pallet of counterweight fall block 6, (inboard, the i.e. pallet of sucker rod fall block on the inside of the pallet of sucker rod fall block 2 Right side) front and back respectively two the first composite track rollers of installation and form front and back two pair of first composite rolling wheel axis setting up and down in pairs 201,201 ' are held, the mounting means of each first composite track roller is welding, and specific mounting means is exactly the first compound rolling The spindle nose of wheel bearing and one piece of round-meshed plate welding, then again with assembly and connection on the inside of the pallet of sucker rod fall block. Each pair of first composite track roller 201,201 ' and the pair of first guide rail 802,802 ' are corresponding one by one, each pair of described First composite track roller 201,201 ' is respectively arranged in the concave tracks of a pair of first guide rail 802,802 ' and makes a pair of the One guide rail is to 2 guide and limit of sucker rod fall block.(inboard, i.e. counterweight fall block on the inside of the pallet of counterweight fall block 6 On the left of pallet) front and back respectively two the second composite track rollers of installation and form front and back two pair of second compound rolling setting up and down in pairs Wheel bearing 601,601 ', the mounting means of each second composite track roller are welding, and specific mounting means is exactly to answer second The spindle nose and one block of round-meshed plate for closing roller bearing weld, and then organize load with the pallet of counterweight fall block inside again It connects.Each pair of second composite track roller 601,601 ' and the pair of second guide rail 803,803 ' are corresponding one by one, each pair of Second composite track roller 601,601 ' is respectively arranged in the concave tracks of a pair of second guide rail 803,803 ' and makes one To the second guide rail to 6 guide and limit of counterweight fall block.Above-mentioned two pair of first composite track roller between the upper and lower away from (upper and lower center Away from) about can be 1 meter, that is, the first composite track roller of a pair (to the first composite track roller on i.e.) above and under The center of first composite track roller of a pair (to the first composite track roller under i.e.) in face away from about can be 1 meter.Above-mentioned one It is in be oppositely arranged (arranged symmetrically) to two the first guide rails in the first guide rail, two the second guide rails in a pair of second guide rail are in It is oppositely arranged (arranged symmetrically).Two the first composite track rollers in each pair of first composite track roller are (right in being oppositely arranged Claim setting), two the second composite track rollers in each pair of second composite track roller are in being oppositely arranged (arranged symmetrically).Oil pumping Bar fall block 2 walks up and down along the first guide rail, and counterweight fall block 6 walks up and down along the second guide rail, is gone up and down using sucker rod Coaster, counterweight fall block purpose be in order to stablize sucker rod motion profile, make its reduce sideshake, work it is safer Reliably.The bracket 10 is mounted in rack 8, can be around the driving wheel 9 that bracket 10 rotates by the bracket limited support, flexible connection Part 9 ' is connected by one end of driving wheel 9 and flexible connecting member 9 ' with the pallet of sucker rod fall block 2, flexible connecting member 9 ' The other end be connected with the pallet of counterweight fall block 6, the power of the power output end of power drive unit 14 and driving wheel 9 Input terminal (power input shaft) is connected.

As shown in Figure 1, Figure 2, Figure 3, Figure 4, above-mentioned driving wheel 9, flexible connecting member 9 ' quantity can be all two.It is above-mentioned Driving wheel 9 can be slot ring antenna, and flexible connecting member 9 ' is round-link chain.In this way, round-link chain (driving chain) installs two simultaneously, Mainly consider that security needs, the safety coefficient of single chain are not less than 6 times, double items are not less than 12 times.Each slot ring antenna It is provided with two driver slots (two slot ring antennas are provided with four driver slots), primarily to being convenient for changing round-link chain.Above-mentioned bracket 10 specific structures being mounted in rack 8 can be, the plate 13 that the top (top) of rack 8 is fixedly connected with convenient for operation, The plate is operating platform, and plate 13 extends horizontally outward from the front side of rack 8, rear side, left side, with sucker rod fall block Corresponding section plate 13 is with jagged, i.e., jagged in the top relative position plate band of sucker rod fall block, flexible connection Part (round-link chain) 9 ' is passed through from this notch.The bracket 10 is fixed on the upper surface of plate 13, bracket 10 by front side longitudinal plate, after Side longitudinal plate is constituted, and front side longitudinal plate, rear side longitudinal plate are mutually neat with the front and rear sides of the frame 800 of rack 8 (can with) respectively.It is dynamic Force driving device 14 can have speed regulating motor and adjust the speed reversing motor (speed regulation orientation adjusting motor, speed regulation deflecting motor) 1401, row Star gear reduction unit 1402, the pedestal of speed regulating motor 1401, the pedestal of planetary reducer 1402 are all fixedly mounted on plate (13) upper surface.In this way, slot ring antenna is driven by adjusting the speed (deflecting) motor and deceleration device, slot ring antenna is made to drive round-link chain (item) positive and negative both direction rotation, round-link chain drives sucker rod fall block 2 and counterweight fall block 6 to move one on the other, complete At pumping operation above and below sucker rod.Motor in power drive unit will be using the large torque electricity with speed regulation and deflecting function Machine convenient for the motion profile of programming Control sucker rod, for example can make the upstroke starting brief acceleration value of sucker rod smaller, connect Stop motor operating when nearly top dead-centre in advance, converted using kinetic energy potential energy, it is made to exempt reversing impact.Above-mentioned power drive unit It can also be speed regulation tuning large torque low speed direct driving motor, eliminate retarder, the power intake (round-link chain with driving wheel 9 The power intake of wheel) it is connected with shaft coupling.Certainly, above-mentioned power drive unit can also be other structures, for example power drives Dynamic device can also be that the outer rotor slow-speed of revolution adjusts the speed orientation adjusting motor, can select installation dynamic in practical application according to the needs of users Force driving device.Power drive unit is not limited only to the above-mentioned several structures stated, and there are many different structural shapes for it.On A box-type machine room 11 can also be fixed by stating on plate 13.The front side of rack 8 is also equipped with maintenance ladder and protective fence 15.It is above-mentioned The for being equipped with first group of buffer 3 for preventing sucker rod fall block from falling on pedestal 4 and preventing that counterweight fall block from falling Two groups of buffers 5, first group of buffer 3 are located at immediately below the pallet of sucker rod fall block 2, and second group of buffer 5, which is located at, matches Immediately below the pallet of weight fall block 6, first group of buffer 3 and second group of buffer 5 are all several (can be 2 ~ 3) Buffering hydraulic cylinder.Each first composite track roller 201 or 201 ' all have main roller 201a, side wheel 201b(with And spindle nose etc.).Each second composite track roller 601 or 601 ' all has main roller, side wheel (and spindle nose etc.), Each first composite track roller is identical as the structure of each second composite track roller itself.The compound rolling of described first and second Wheel bearing can reach the composite track roller (commercial goods) of special bearing Co., Ltd production using Changzhou an ancient unit of weight.

Embodiment 2: the present embodiment is similar with embodiment 1, except that above-mentioned driving wheel 9 is rolling in the present embodiment Subchain wheel, flexible connecting member 9 ' are roller chain.Specifically roller chain wheel is board-like roller chain wheel, and flexible connecting member is board-like Roller chain.

Embodiment 3: the present embodiment is similar with embodiment 1, except that above-mentioned driving wheel 9 is band in the present embodiment It takes turns (glue coating wheel), flexible connecting member 9 ' is drive belt (belt), has wire-core in drive belt.

The following are to the utility model further instruction (referring to following discussion).

1, the utility model stroke is long, stroke long enough, and theoretical according to oil pumping, stroke is longer, the elastic stretching of sucker rod Percent loss is lower, and the efficiency of stroke is higher.As long as so the unobvious increase of cost of manufacture, the unobvious increasing of main screw lift Add, stroke is the bigger the better.The every stroke for increasing by one meter of the utility model, theoretically weight increases by 250 kilograms or so (stroke increases One meter, needing to increase by four meters of round-link chains, the loop chain rice of diameter 30 is 18kg again, needs to increase by four meters of C16 sliding rails, and rice weighs 32kg, Total about 200kg, reinforcing rib about 50kg), about 6 ~ 10 tons of the main screw lift of 16 meters of strokes or so, this weight is more than beam machine Gently more are wanted, are that ground and transport can be born completely, the increase of manufacturing cost is also very limited.Meanwhile increasing stroke Another important function is can effectively to increase the service life of each moving component, such as guide rail, such as driving chain (sandwich belt), reduces commutation number of motor etc..

2, the configuration of the utility model power drive unit (power source, dynamical system): the utility model power drive dress The driving power set, is mainly considered as intelligent drives power, is mainly manifested in the overall process of stroke, and Discrete control is adopted Different acceleration and speed, such as starting section is taken to rush using the method starting for being stepped up acceleration to avoid big electric current It hits and the stress of sucker rod is impacted, extend the service life of motor and sucker rod.In addition the dynamical system can sufficiently meet The commutation of up-down stroke needs, the positive and negative rotation of motor, drives drive chain (band) wheel, chain (sandwich belt) dragging sucker rod and matches Weight moves one on the other, completes pumping operation.Connection between motor and driving wheel can take many forms, such as mechanical Formula retarder, low-speed high-torque motor directly drive driving wheel or outer rotor low-speed high-torque motor directly drives, and specifically use form It will be depending on the use condition of user.Choosing suitable power drive unit is to guarantee type oil pumping function long-time stable fortune One of capable important prerequisite condition.

3, the important component of another power of the utility model transmitting is chain (or sandwich belt), and the chain of the machine is adopted It is Straight pull force way, not by lateral force, moment of flexure will not be generated.The service life of chain (sandwich belt) is compared with than by side It will be greatly increased to the service life of chain of power.When using chain, it will four chain drive gears of setting, while equipping two chains Item, other two sprocket wheel are to facilitate the replacement of chain and spare.If using sandwich belt, principle is also the same. It to be determined according to actual actual conditions as using annular chains or board-like rod chain or sandwich belt.

4, the utility model uses dedicated track and matched composite track roller (composite rolling wheel guide bearing), In coaster corresponding with every track side, it is welded with 2 composite track rollers, two tracks and four composite track rollers The kinematic pair that sucker rod fall block slides up and down is constituted, other two track and four additional composite track roller constitute counterweight The kinematic pair that fall block slides up and down, so that it is guaranteed that two coasters can only move towards to move up and down according to track (sliding rail), two A coaster drags sucker rod respectively and lifts counterweight.The purpose of the design is that the coaster with sucker rod and carrying counterweight is enable to stablize Ground moves up and down along track, can effectively guarantee sucker rod traveling comfort, avoids sucker rod by lateral force and and well Wall rubs, and leads to sucker rod premature failure and damages the borehole wall, extend the service life of sucker rod, and then extends whole The service life of machine.It is that the load of motor becomes (during upper and lower stroke) in upper and lower operational process for sucker rod that counterweight, which is arranged, In consistent, power of motor and torque is made to reach most rational state, avoids the occurrence of that power of motor is superfluous or overload.

5, the utility model from safety considerations, mainly takes proactive security measures, for example transmission chain (band) can take Bigger safety coefficient, such as theoretical value are 12 times.And being equipped in said base (or ground) prevents sucker rod from going up and down First group of buffer that coaster falls and prevent second group of buffer that counterweight fall block falls, first group of buffer and Second group of buffer is all several buffering hydraulic cylinders, can prevent sucker rod from pounding the generation of well accident.

In conclusion the long stroke pumping unit structure of the utility model is simple, stroke is big (stroke is long), securely and reliably, therefore Barrier rate is low, and maintenance is few, and low energy consumption, and energy conservation, main screw lift is small, and manufacturing cost is low, long service life.

Claims (10)

1. a kind of long stroke pumping unit has pedestal (4), the rack (8) being fixedly installed on pedestal, sucker rod (1), feature It is that the long stroke pumping unit also has the first guide rail of a pair (802,802 ') being fixedly installed on the left of rack (8), consolidates Dingan County is loaded on the second guide rail of a pair (803,803 ') on the right side of rack (8), two couple of first composite track roller (201,201 '), two To the second composite track roller (601,601 '), counterweight (7), sucker rod fall block (2), counterweight fall block (6), driving wheel (9), flexible connecting member (9 '), the bracket (10), power drive unit for constituting a pair of of kinematic pair are matched with the driving wheel (14)；

The top of the sucker rod (1) is fixedly connected with the pallet of sucker rod fall block (2), and counterweight (7) is gone up and down set on counterweight In the pallet of coaster (6), front and back respectively two the first composite track rollers of installation and shape on the inside of the pallet of sucker rod fall block (2) At pairs of two pair of first composite track roller (201,201 ') setting up and down in front and back, each pair of first composite track roller (201,201 ') and the pair of first guide rail (802,802 ') are corresponding one by one, each pair of first composite track roller (201,201 ') are respectively arranged in the concave tracks of a pair of first guide rail (802,802 ') and make a pair of first guide rail to oil pumping The pallet inside front and back of bar fall block (2) guide and limit, counterweight fall block (6) is respectively installed by two the second composite track rollers And pairs of two pair of second composite track roller (601,601 ') setting up and down in front and back is formed, each pair of second composite rolling wheel axis It holds (601,601 ') and the pair of second guide rail (803,803 ') is corresponding one by one, each pair of second composite track roller (601,601 ') are respectively arranged in the concave tracks of a pair of second guide rail (803,803 ') and make a pair of second guide rail to counterweight Fall block (6) guide and limit；

The bracket (10) is mounted on rack (8), can around the driving wheel (9) that bracket (10) rotate by the bracket limited support, Flexible connecting member (9 ') is by driving wheel (9) and one end and the pallet phase of sucker rod fall block (2) of flexible connecting member (9 ') Connection, the other end of flexible connecting member (9 ') are connected with the pallet of counterweight fall block (6), and power drive unit (14) moves Power output end is connected with the power intake of driving wheel (9).

2. long stroke pumping unit according to claim 1, it is characterised in that above-mentioned driving wheel (9), flexible connecting member (9 ') Quantity be all two.

3. long stroke pumping unit according to claim 1 or 2, it is characterised in that above-mentioned driving wheel (9) is slot ring antenna, soft Property connector (9 ') be round-link chain.

4. long stroke pumping unit according to claim 1 or 2, it is characterised in that above-mentioned driving wheel (9) is slot ring antenna, soft Property connector (9 ') be round-link chain, each slot ring antenna is provided with two driver slots.

5. long stroke pumping unit according to claim 1 or 2, it is characterised in that above-mentioned driving wheel (9) is roller chain wheel, soft Property connector (9 ') be roller chain.

6. long stroke pumping unit according to claim 1 or 2, it is characterised in that above-mentioned driving wheel (9) is for roller chain wheel Board-like roller chain wheel, flexible connecting member (9 ') are board-like roller chain.

7. long stroke pumping unit according to claim 1 or 2, it is characterised in that above-mentioned driving wheel (9) is belt wheel, and flexibility is even Fitting (9 ') is drive belt, has wire-core in drive belt.

8. long stroke pumping unit according to claim 1, it is characterised in that above-mentioned bracket (10) is mounted on rack (8) Specific structure is, the plate (13) that the top of rack (8) is fixedly connected with convenient for operation, plate (13) from the front sides of rack (8), Rear side, left side extend horizontally outward, with sucker rod fall block corresponding section plate (13) with jagged, flexible connecting member (9 ') are passed through from this notch, and the bracket (10) is fixed on the upper surface of plate (13), and bracket (10) is by front side longitudinal plate, rear side Longitudinal plate is constituted, and front side longitudinal plate, rear side longitudinal plate are mutually neat with the front and rear sides of the frame (800) of rack (8) respectively.

9. long stroke pumping unit according to claim 8, it is characterised in that above-mentioned power drive unit (14) has speed regulation Motor (1401) adjusts the speed reversing motor, planetary reducer (1402), pedestal, the planetary gear reduction of speed regulating motor (1401) The pedestal of fast device (1402) is all fixedly mounted on the upper surface of plate (13).

10. long stroke pumping unit according to claim 1, it is characterised in that being equipped in said base (4) prevents from pumping First group of buffer (3) that bar fall block falls and second group of buffer (5) for preventing counterweight fall block from falling, first group Buffer (3) is located at immediately below the pallet of sucker rod fall block (2), and second group of buffer (5) is located at counterweight fall block (6) Pallet immediately below, first group of buffer (3) and second group of buffer (5) are all several buffering hydraulic cylinders.