CN111924740A - Vertical pumping unit with anti-falling device - Google Patents

Vertical pumping unit with anti-falling device Download PDF

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Publication number
CN111924740A
CN111924740A CN202011021226.1A CN202011021226A CN111924740A CN 111924740 A CN111924740 A CN 111924740A CN 202011021226 A CN202011021226 A CN 202011021226A CN 111924740 A CN111924740 A CN 111924740A
Authority
CN
China
Prior art keywords
fixedly connected
wall
pumping unit
sliding
falling device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011021226.1A
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Chinese (zh)
Inventor
王景洲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongying Able Petroleum Technology Co ltd
Original Assignee
Dongying Able Petroleum Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongying Able Petroleum Technology Co ltd filed Critical Dongying Able Petroleum Technology Co ltd
Priority to CN202011021226.1A priority Critical patent/CN111924740A/en
Publication of CN111924740A publication Critical patent/CN111924740A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00Portable or mobile lifting or hauling appliances
    • B66D3/04Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121Lifting well fluids
    • E21B43/126Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00Self-acting brakes, e.g. coming into operation at a predetermined speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/28Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same

Abstract

The invention provides a vertical pumping unit with an anti-falling device, and relates to the technical field of petroleum machinery. This vertical beam-pumping unit, including base and steel cable, equal fixedly connected with frame on the relative one side outer wall in two base tops, both sides fixedly connected with reversal motor on the outer wall of fixing base top, the inside balancing piece that all is provided with of two frames, balancing piece one end fixedly connected with friction disc is stretched out to two sliding seats. Through the anti-falling device that friction disc, slide bar, connecting block, connecting rod are constituteed, after the steel cable fracture, the balancing piece of both sides can drop fast, and the connecting rod that is in the tilt state turns into the horizontality, through sliding seat jack-up friction disc, and the friction between friction disc and the frame inner wall prevents the balancing piece and continues the tenesmus, prevents that the balancing piece from dropping and damaging the beam-pumping unit, and two reverse motors rotate the pulling fixed pulley up-and-down reciprocating motion in opposite direction relatively, have reduced the work load of reverse motor.

Description

Vertical pumping unit with anti-falling device
Technical Field
The invention relates to the technical field of petroleum machinery, in particular to a vertical pumping unit with an anti-falling device.
Background
The pumping unit is the main oil extraction equipment in the oil field, operates under various conventional and complex oil extraction working conditions on the ocean and the land, and mainly comprises a beam pumping unit and a vertical pumping unit, wherein the vertical pumping unit is a heavy-load long-time continuous operation machine, the pumping stroke of the vertical pumping unit is longer, and higher balance is needed in the long-stroke operation process.
The existing vertical pumping unit only uses a single motor to pump oil, the working load of the motor is large, the service life of the pumping unit can be influenced, and the balance weight falls off after the steel rope is broken during the working of the pumping unit, so that the pumping unit can be damaged.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a vertical pumping unit with an anti-falling device, which solves the problems that a single motor has heavy load and a balance block falls down to damage the pumping unit due to the breakage of a steel rope.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a vertical beam-pumping unit with anti-falling device, includes base and steel cable, equal fixedly connected with frame on the relative one side outer wall in two base tops, two frame inside all are provided with the balancing piece, frame one side all inclines 60 degrees fixedly connected with bearing diagonal board, bearing diagonal board's bottom is at base top fixed connection, fixedly connected with switch board and switch board are at base top fixed connection on the left side frame left side bottom outer wall, fixedly connected with fixing base on the outer wall between two frame tops, both sides fixedly connected with reversing motor on the fixing base top outer wall, the output of two reversing motor rotates and is connected with the output belt pulley.
Preferably, be provided with the inner chamber on the balancing piece top intermediate position inner wall, sliding connection has the slide bar in the inner chamber, slide bar bottom end fixedly connected with stopper and stopper size are the same with inner chamber cross section size, the top and the slide bar fixed connection that are provided with reset spring and reset spring on the slide bar, reset spring's bottom and stopper fixed connection, slide bar top fixedly connected with connecting block, connecting block top fixedly connected with movable pulley.
Preferably, the connecting block is connected with the connecting rod on the outer wall of two sides in a rotating manner, the bottom end of the connecting rod is connected with a sliding seat and the sliding seat is connected with the sliding seat on the outer wall of the top of the balancing block in a sliding manner, the two sliding seats stretch out of a friction plate fixedly connected with one end of the balancing block, and the friction plate is made of carbon fiber friction materials.
Preferably, the outer walls of the middle positions of the two sides of the balance block are fixedly connected with rotating bearings, rolling wheels are rotationally connected in the rotating bearings, and the two rolling wheels are in sliding connection with the inner walls of the two sides of the rack.
Preferably, the two sides of the bottom of the fixing seat are fixedly connected with L-shaped connecting sheets, a sliding block is connected between the two L-shaped connecting sheets in a sliding mode, the two sides of the bottom of the sliding block are connected with the inner walls of the L-shaped connecting sheets in a sliding mode, a first supporting rod is fixedly connected to the outer wall of the middle position of the bottom of the sliding block, and a distance sensor is arranged at the bottom end of the first supporting rod.
Preferably, one end of the steel rope is fixedly connected to the inner wall of the top of the left side rack, the steel rope sequentially penetrates through the movable pulley at the top of the left side connecting block, the output belt pulley at the top of the left side of the fixing seat, the output belt pulley at the top of the right side of the fixing seat and the movable pulley at the top of the right side connecting block, and the other end of the steel rope is fixedly connected to the inner wall of the top of the right side rack.
Preferably, a fixed pulley is arranged at the middle position of the steel rope, and the position of the fixed pulley corresponds to the position of the distance sensor.
Preferably, a sliding groove is formed in the connecting rod, second supporting rods are fixedly connected to the outer walls of the two sides of the top of the balance block, and fixed teeth are arranged at the top ends of the second supporting rods and are in sliding connection with the sliding groove.
The working principle is as follows: two reversing motors work through a control cabinet, the reversing motors drive output belt pulleys to rotate, the two output belt pulleys rotate oppositely in the opposite directions, the left reversing motor rotates clockwise, a steel rope is pulled to move upwards through a movable pulley, rolling wheels on two sides of the balance block roll on the inner walls of two sides of a rack to reduce friction between the balance block and the inner wall of the rack, the movable pulley pulls a sliding rod to move upwards to compress a return spring, a limit block can limit and protect the sliding rod to prevent the sliding rod from falling off, the right reversing motor rotates anticlockwise while the left balance block moves upwards, the right balance block is pulled to move upwards through the steel rope and the right movable pulley, so that a fixed pulley moves downwards, the balance blocks on two sides can rapidly fall off after the steel rope is broken when the pumping unit works, meanwhile, the return spring in a compressed state extends, and the sliding rod pulls a connecting block and the, fixed tooth slides in the sliding tray on the connecting rod, the connecting rod that is in the tilt state turns into the horizontality, jack-up friction disc through the sliding seat, prevent the balancing piece to continue the tenesmus through the friction between friction disc and the frame inner wall, when the impact distance of fixed pulley needs to be adjusted, slide the slider and install between two L type connection pieces, the distance between first bracing piece bottom inductor can respond to and the fixed pulley, after the fixed pulley reaches the settlement distance, the switch board control two reversal motors stop work and move to opposite direction separately, make the fixed pulley do up-and-down reciprocating motion.
(III) advantageous effects
The invention provides a vertical pumping unit with an anti-falling device. The method has the following beneficial effects:
1. according to the anti-falling device composed of the friction plate, the sliding rod, the connecting block and the connecting rod, when the steel rope is broken when the pumping unit works, the balance blocks on two sides can fall off quickly, meanwhile, the return spring in a compressed state extends, the connecting block and the movable pulley are pulled by the sliding rod to move downwards, the fixed teeth slide in the sliding groove on the connecting rod, the connecting rod in an inclined state is converted into a horizontal state, the friction plate is jacked up through the sliding seat, the balance blocks are prevented from falling continuously due to friction between the friction plate and the inner wall of the rack, and the balance blocks are prevented from falling off and.
2. The two reverse motors rotate oppositely to pull the fixed pulley to reciprocate up and down, so that the working load of the reverse motors is reduced, and the service life of the pumping unit is effectively prolonged.
3. According to the invention, by arranging the L-shaped connecting sheets and the sliding blocks, when the impulse distance needs to be adjusted, the sliding blocks are installed in a sliding mode between the two L-shaped connecting sheets, the distance between the sliding blocks and the fixed pulley can be sensed through the distance sensor at the bottom end of the first supporting rod, the length of the first supporting rod can be replaced according to actual conditions, and the position of the distance sensor is adjusted to adjust the impulse distance, so that the oil pumping device is suitable for oil pumping work of oil wells with different impulse distances.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic view of a weight according to the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 1;
FIG. 4 is an enlarged view at B in FIG. 2;
fig. 5 is an enlarged view at C in fig. 2.
Wherein, 1, a base; 2. a frame; 3. an inclined support plate; 4. a steel cord; 5. a fixed seat; 6. a reverse motor; 7. an output pulley; 8. a fixed pulley; 9. fixing teeth; 10. a control cabinet; 11. a counterbalance; 12. an L-shaped connecting sheet; 13. a slider; 14. a first support bar; 15. a distance sensor; 16. a movable pulley; 17. connecting blocks; 18. a connecting rod; 19. a sliding seat; 20. a rotating bearing; 21. a friction plate; 22. a rolling wheel; 23. an inner cavity; 24. a slide bar; 25. a return spring; 26. a limiting block; 27. a second support bar; 28. a sliding groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in figures 1-5, the embodiment of the invention provides a vertical oil pumping unit with an anti-falling device, which comprises bases 1 and steel ropes 4, wherein the outer wall of one side of each of the two bases 1, which is opposite to the top, is fixedly connected with a frame 2, the inner parts of the two frames 2 are respectively provided with a balance weight 11, one side of each of the frames 2 is fixedly connected with an inclined support plate 3 which inclines by 60 degrees, the bottom end of each inclined support plate 3 is fixedly connected with the top of the base 1, the outer wall of the bottom of the left side frame 2 is fixedly connected with a control cabinet 10, the control cabinet 10 is fixedly connected with the top of the base 1, a fixed seat 5 is fixedly connected with the outer wall between the tops of the two frames 2, two sides of the outer wall of the top of the fixed seat 5 are fixedly connected with reversing, the two output pulleys 7 rotate in opposite directions relative to each other.
Be provided with inner chamber 23 on the 11 top intermediate position inner walls of balancing piece, sliding connection has slide bar 24 in the inner chamber 23, slide bar 24 bottom fixedly connected with stopper 26 and stopper 26 size are the same with the 23 cross section sizes of inner chamber, the top and the slide bar 24 fixed connection that are provided with reset spring 25 and reset spring 25 on the slide bar 24, reset spring 25's bottom and stopper 26 fixed connection, slide bar 24 top fixedly connected with connecting block 17, connecting block 17 top fixedly connected with movable pulley 16.
Connecting block 17 both sides outer wall is gone up and is rotated and be connected with connecting rod 18, the bottom of connecting rod 18 is rotated and is connected with sliding seat 19 and sliding seat 19 sliding connection on balancing piece 11 top outer wall, 11 one end fixedly connected with friction disc 21 of balancing piece is stretched out to two sliding seats 19, the material of friction disc 21 is carbon fiber friction material, after steel cable 4 breaks at the beam-pumping unit during operation, balancing piece 11 of both sides can drop fast, reset spring 25 extension that is in compression state simultaneously, move down through 24 pulling connecting block 17 of slide bar and movable pulley 16, fixed tooth 9 slides in the sliding tray 28 on connecting rod 18, connecting rod 18 that is in the tilt state turns into the horizontality, jack-up friction disc 21 through sliding seat 19, prevent balancing piece 11 to continue the tenesmus through the friction between friction disc 21 and the frame 2 inner.
The outer walls of the middle positions of the two sides of the balance block 11 are fixedly connected with rotating bearings 20, rolling wheels 22 are rotatably connected in the rotating bearings 20, and the two rolling wheels 22 are both in sliding connection with the inner walls of the two sides of the rack 2.
The two sides of the bottom of the fixing seat 5 are fixedly connected with L-shaped connecting sheets 12, a sliding block 13 is connected between the two L-shaped connecting sheets 12 in a sliding mode, the two sides of the bottom of the sliding block 13 are connected with the inner walls of the L-shaped connecting sheets 12 in a sliding mode, a first supporting rod 14 is fixedly connected to the outer wall of the middle position of the bottom of the sliding block 13, a distance sensor 15 is arranged at the bottom end of the first supporting rod 14, when the impact distance of the fixed pulley 8 needs to be adjusted, the sliding block 13 is installed between the two L-shaped connecting sheets 12 in a sliding mode, the distance sensor 15 at the bottom end of the first supporting rod 14 can sense the distance between the fixed pulley 8, and when the fixed pulley 8 reaches a set distance, the control cabinet 10 controls the two reversing motors 6 to stop.
One end of a steel rope 4 is fixedly connected on the inner wall of the top of the left side frame 2, the steel rope 4 sequentially passes through a movable pulley 16 on the top of a left side connecting block 17, an output pulley 7 on the top of the left side of a fixed seat 5, an output pulley 7 on the top of the right side of the fixed seat 5 and a movable pulley 16 on the top of a right side connecting block 17, the other end of the steel rope 4 is fixedly connected on the inner wall of the top of the right side frame 2, a left side reverse motor 6 rotates clockwise, the steel rope 4 is pulled to pull a balance block 11 to move upwards through the movable pulley 16, rolling wheels 22 on two sides of the balance block 11 roll on the inner walls on two sides of the frame 2 to reduce friction between the balance block 11 and the inner wall of the frame 2, meanwhile, the movable pulley 16 pulls a sliding rod 24 to move upwards to compress a reset spring 25, the right balance weight 11 is pulled to move upwards through the steel rope 4 and the right movable pulley 16, so that the fixed pulley 8 moves downwards.
A fixed pulley 8 is arranged at the middle position of the steel rope 4, and the position of the fixed pulley 8 corresponds to the position of the distance sensor 15.
The connecting rod 18 is provided with a sliding groove 28, the outer walls of two sides of the top of the balance block 11 are fixedly connected with second supporting rods 27, the top ends of the second supporting rods 27 are provided with fixed teeth 9, and the fixed teeth 9 are slidably connected with the sliding groove 28.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides a vertical beam-pumping unit with anti-falling device, includes base (1) and steel cable (4), its characterized in that: equal fixedly connected with frame (2) on the relative one side outer wall in two base (1) tops, two frame (2) are inside all to be provided with balancing piece (11), frame (2) one side all inclines 60 degrees fixedly connected with bearing diagonal board (3), the bottom of bearing diagonal board (3) is at base (1) top fixed connection, fixedly connected with switch board (10) and switch board (10) are at base (1) top fixed connection on the outer wall of left side frame (2) left side bottom, fixedly connected with fixing base (5) on the outer wall between two frame (2) tops, both sides fixedly connected with reversal motor (6) on fixing base (5) top outer wall, the output of two reversal motor (6) rotates and is connected with output pulley (7).
2. The vertical pumping unit with the anti-falling device according to claim 1, characterized in that: be provided with inner chamber (23) on balancing piece (11) top intermediate position inner wall, sliding connection has slide bar (24) in inner chamber (23), slide bar (24) bottom fixedly connected with stopper (26) and stopper (26) size are the same with inner chamber (23) cross section size, the top and slide bar (24) fixed connection that are provided with reset spring (25) and reset spring (25) on slide bar (24), the bottom and stopper (26) fixed connection of reset spring (25), slide bar (24) top fixedly connected with connecting block (17), connecting block (17) top fixedly connected with movable pulley (16).
3. The vertical pumping unit with the anti-falling device according to claim 2, characterized in that: connecting block (17) both sides outer wall go up to rotate and is connected with connecting rod (18), the bottom of connecting rod (18) is rotated and is connected with sliding seat (19) and sliding seat (19) sliding connection on balancing piece (11) top outer wall, balancing piece (11) one end fixedly connected with friction disc (21) is stretched out in two sliding seats (19), the material of friction disc (21) is carbon fiber friction material.
4. The vertical pumping unit with the anti-falling device according to claim 2, characterized in that: fixedly connected with rolling bearing (20) on balancing piece (11) both sides intermediate position outer wall, rolling wheel (22) are connected to rolling bearing (20) internal rotation, two rolling wheel (22) all with frame (2) both sides inner wall sliding connection.
5. The vertical pumping unit with the anti-falling device according to claim 1, characterized in that: fixing base (5) bottom both sides fixedly connected with L type connection piece (12), sliding connection has slider (13) and slider (13) bottom both sides and L type connection piece (12) inner wall sliding connection between two L type connection pieces (12), first bracing piece (14) of fixedly connected with on the slider (13) bottom intermediate position outer wall, first bracing piece (14) bottom is provided with apart from inductor (15).
6. The vertical pumping unit with the anti-falling device according to claim 1, characterized in that: one end of the steel rope (4) is fixedly connected to the inner wall of the top of the left side rack (2), and the steel rope (4) sequentially penetrates through the movable pulley (16) at the top of the left side connecting block (17), the output belt pulley (7) at the top of the left side of the fixing seat (5), the output belt pulley (7) at the top of the right side of the fixing seat (5) and the movable pulley (16) at the top of the right side connecting block (17), and the other end of the steel rope (4) is fixedly connected to the inner wall of the top of the right side rack (2).
7. The vertical pumping unit with the anti-falling device according to claim 1, characterized in that: a fixed pulley (8) is arranged in the middle of the steel rope (4), and the position of the fixed pulley (8) corresponds to the position of the distance sensor (15).
8. The vertical pumping unit with the anti-falling device according to claim 1, characterized in that: the connecting rod (18) is provided with a sliding groove (28), the outer walls of the two sides of the top of the balance block (11) are fixedly connected with second supporting rods (27), and the top ends of the second supporting rods (27) are provided with fixed teeth (9) and the fixed teeth (9) are in sliding connection with the sliding groove (28).
CN202011021226.1A 2020-09-25 2020-09-25 Vertical pumping unit with anti-falling device Pending CN111924740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011021226.1A CN111924740A (en) 2020-09-25 2020-09-25 Vertical pumping unit with anti-falling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011021226.1A CN111924740A (en) 2020-09-25 2020-09-25 Vertical pumping unit with anti-falling device

Publications (1)

Publication Number Publication Date
CN111924740A true CN111924740A (en) 2020-11-13

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CN (1) CN111924740A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200975239Y (en) * 2006-11-27 2007-11-14 山东墨龙石油机械股份有限公司 Umbrella type non-beam pumping unit
CN200989195Y (en) * 2006-12-28 2007-12-12 蔡光宇 Gear free driving energy-saving beam-pumping unit
CN201092847Y (en) * 2007-09-25 2008-07-30 杨忠 To-and-fro motion type electric machine energy-saving oil pump device
CN201344024Y (en) * 2009-01-23 2009-11-11 徐洪德 Double-cylinder symmetrical-type equilibrium hydraulic pumping unit
CN201714345U (en) * 2010-04-13 2011-01-19 窦凯 Balancing device of pumping rod directly-balanced type energy-saving pumping unit
CN102041977A (en) * 2009-10-14 2011-05-04 长江大学 Torque filtering device of pumping unit
KR20140100877A (en) * 2013-11-07 2014-08-18 석정건설(주) Method for excavating rock tunnel
CN104030123A (en) * 2014-06-23 2014-09-10 无锡市崇安区科技创业服务中心 Lift fall protection device
CN108198518A (en) * 2018-01-01 2018-06-22 郭纪光 A kind of solid terrain simulation and display equipment
CN210012529U (en) * 2019-04-15 2020-02-04 中铁上海工程局集团第五工程有限公司 Hoist and mount welding equipment suitable for heavy object lifts by crane

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200975239Y (en) * 2006-11-27 2007-11-14 山东墨龙石油机械股份有限公司 Umbrella type non-beam pumping unit
CN200989195Y (en) * 2006-12-28 2007-12-12 蔡光宇 Gear free driving energy-saving beam-pumping unit
CN201092847Y (en) * 2007-09-25 2008-07-30 杨忠 To-and-fro motion type electric machine energy-saving oil pump device
CN201344024Y (en) * 2009-01-23 2009-11-11 徐洪德 Double-cylinder symmetrical-type equilibrium hydraulic pumping unit
CN102041977A (en) * 2009-10-14 2011-05-04 长江大学 Torque filtering device of pumping unit
CN201714345U (en) * 2010-04-13 2011-01-19 窦凯 Balancing device of pumping rod directly-balanced type energy-saving pumping unit
KR20140100877A (en) * 2013-11-07 2014-08-18 석정건설(주) Method for excavating rock tunnel
CN104030123A (en) * 2014-06-23 2014-09-10 无锡市崇安区科技创业服务中心 Lift fall protection device
CN108198518A (en) * 2018-01-01 2018-06-22 郭纪光 A kind of solid terrain simulation and display equipment
CN210012529U (en) * 2019-04-15 2020-02-04 中铁上海工程局集团第五工程有限公司 Hoist and mount welding equipment suitable for heavy object lifts by crane

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Application publication date: 20201113

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