Hydraulic pumping unit

Abstract

The utility model discloses a hydraulic oil pumping unit, which relates to the technical field of oil exploitation equipment and comprises a rack, an oil pumping rod, an upper reversing piece, a lower reversing piece, a balance flexible traction piece, an upper flexible traction piece, a lower flexible traction piece, a balancing weight, a movable reversing piece assembly and a hydraulic driving device. The second end of the balance flexible traction piece bypasses the upper reversing piece and then is fixedly connected with the balancing weight, the first end of the upper flexible traction piece is fixedly arranged on the rack, the second end of the upper flexible traction piece bypasses the movable reversing piece assembly and the upper reversing piece in sequence and then is fixedly connected with the balancing weight, and the first end of the lower flexible traction piece is fixedly arranged on the rack. The second end of the lower flexible traction piece sequentially bypasses the movable reversing piece assembly and the lower reversing piece and then is fixedly connected with the balancing weight. The hydraulic driving device can drive the movable reversing piece assembly to move upwards or downwards. The requirement for the stroke of the hydraulic driving device is lowered, and the stroke of the sucker rod can be conveniently increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum exploitation equipment technical field especially relates to a hydraulic oil pumping unit. BACKGROUND

[0002] With the continuous development of oil resources, oil well exploitation conditions are increasingly complex, the traditional beam type oil pumping unit gradually exposes the problems such as large size, low efficiency, high energy consumption and poor adaptability under the special working conditions such as deep well and heavy oil well, and it is difficult to meet the requirements of modern oilfield development. Hydraulic oil pumping unit gradually attracts the attention of the industry due to its advantages such as high efficiency, energy saving, low stroke and compact structure.

[0003] However, the stroke of the oil pumping rod of the existing hydraulic oil pumping unit is often limited by the stroke of the hydraulic cylinder, and the use of a hydraulic cylinder with too large stroke will cause the vibration of the equipment to intensify during use, greatly increasing the equipment failure. Therefore, the existing hydraulic oil pumping unit cannot meet the oil production operation needs of old oil fields and deep oil fields. SUMMARY

[0004] The utility model aims at providing a hydraulic oil pumping unit to solve the problems existing in the prior art, reduce the stroke requirement of the hydraulic drive device, and facilitate the stroke of the oil pumping rod.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a hydraulic oil pumping unit, including frame, oil pumping rod, upper reversing piece, lower reversing piece, balance flexible traction piece, upper flexible traction piece, lower flexible traction piece, counterweight, dynamic reversing piece assembly and hydraulic drive device, the upper reversing piece, the lower reversing piece and the hydraulic drive device all are located on the frame, the upper reversing piece is placed above the lower reversing piece, the counterweight is placed between the upper reversing piece and the lower reversing piece, the dynamic reversing piece assembly can move upwards or downwards, the first end of the balance flexible traction piece is fixedly connected with the oil pumping rod, the second end of the balance flexible traction piece is fixedly connected with the counterweight after passing the upper reversing piece, the first end of the upper flexible traction piece is fixedly arranged on the frame, the second end of the upper flexible traction piece is fixedly connected with the counterweight after passing the dynamic reversing piece assembly and the upper reversing piece in proper order, the first end of the lower flexible traction piece is fixedly arranged on the frame, the second end of the lower flexible traction piece is fixedly connected with the counterweight after passing the dynamic reversing piece assembly and the lower reversing piece in proper order, the hydraulic drive device is transmission connection with the dynamic reversing piece assembly, the hydraulic drive device can drive the dynamic reversing piece assembly to move upwards or downwards.

[0007] Preferably, the dynamic reversing element assembly is arranged below the upper reversing element, and the dynamic reversing element assembly is arranged above the lower reversing element.

[0008] Preferably, the dynamic reversing element assembly comprises at least one dynamic pulley, the dynamic pulley is capable of moving upward or downward, the dynamic pulley is capable of changing the routes of the upper flexible traction element and the lower flexible traction element, the hydraulic drive device is in driving connection with the dynamic pulley, and the hydraulic drive device is capable of driving the dynamic pulley to move upward or downward.

[0009] Preferably, the number of the dynamic pulleys is one, the first end of the upper flexible traction element is arranged above the dynamic pulley, the second end of the upper flexible traction element is in turn arranged around the dynamic pulley and the upper reversing element, and then is fixedly connected with the counterweight, the first end of the lower flexible traction element is arranged below the dynamic pulley, and the second end of the lower flexible traction element is in turn arranged around the dynamic pulley and the lower reversing element, and then is fixedly connected with the counterweight.

[0010] Preferably, the hydraulic drive device comprises one hydraulic cylinder, the cylinder body of the hydraulic cylinder is fixedly arranged on the frame, a first mounting bracket is fixedly arranged on the top end of the piston rod of the hydraulic cylinder, and the dynamic pulley is rotatably arranged on the first mounting bracket.

[0011] Preferably, the dynamic reversing element assembly comprises at least two dynamic pulleys, at least one upper internal pulley and at least one lower internal pulley, the dynamic pulleys are arranged side by side, one upper internal pulley and one lower internal pulley are arranged between any two adjacent dynamic pulleys, the upper internal pulleys are arranged above the dynamic pulleys, the lower internal pulleys are arranged below the dynamic pulleys, the first end of the upper flexible traction element is arranged above the dynamic pulleys, the second end of the upper flexible traction element is in turn arranged around the dynamic pulleys and the upper internal pulleys, and then is arranged around the upper reversing element and is fixedly connected with the counterweight, the first end of the lower flexible traction element is arranged below the dynamic pulleys, and the second end of the lower flexible traction element is in turn arranged around the dynamic pulleys and the lower internal pulleys, and then is arranged around the lower reversing element and is fixedly connected with the counterweight.

[0012] Preferably, the hydraulic drive device comprises at least two hydraulic cylinders, the number of the hydraulic cylinders is equal to the number of the dynamic pulleys, the hydraulic cylinders correspond to the dynamic pulleys one by one, the cylinder bodies of the hydraulic cylinders are fixedly arranged on the frame, first mounting brackets are fixedly arranged on the top ends of the piston rods of the hydraulic cylinders, and the dynamic pulleys are rotatably arranged on the first mounting brackets.

[0013] Preferably, the hydraulic drive device comprises a hydraulic cylinder, a cylinder body of the hydraulic cylinder is fixedly arranged on the frame, a second mounting bracket is fixedly arranged on an ejection end of a piston rod of the hydraulic cylinder, at least two third mounting brackets are fixedly arranged on the second mounting bracket, the number of the third mounting brackets is equal to the number of the movable pulleys, the third mounting brackets correspond to the movable pulleys one by one, and the movable pulleys are rotatably arranged on the third mounting brackets.

[0014] Preferably, the hydraulic drive device further comprises an auxiliary reversing element, the auxiliary reversing element is arranged on the frame, the auxiliary reversing element is arranged above the movable reversing element assembly, and the second end of the balance flexible traction element is fixedly connected with the counterweight after passing through the auxiliary reversing element and the upper reversing element in sequence.

[0015] Preferably, the upper reversing element is an upper fixed pulley, the lower reversing element is a lower fixed pulley, the auxiliary reversing element is an auxiliary fixed pulley, the balance flexible traction element is a balance traction steel wire rope, the upper flexible traction element is an upper traction steel wire rope, and the lower flexible traction element is a lower traction steel wire rope.

[0016] Compared with the prior art, the hydraulic drive device has the following technical effects:

[0017] The hydraulic oil pumping machine provided by the utility model, through the balance flexible traction part, the counterweight block is connected with the oil pumping rod, through setting the counterweight block, the weight of the oil pumping rod is balanced, so that the counterweight block and the oil pumping rod can keep stable without external force, and meanwhile, under the condition of applying small external force, the balance of the counterweight block and the oil pumping rod can be broken, so that the oil pumping rod moves downward or upward, through setting the upper flexible traction part, the upward traction of the counterweight block is completed, through setting the lower flexible traction part, the downward traction of the counterweight block is completed, through setting the upper reversing part, the reversing of the balance flexible traction part and the upper flexible traction part is completed, through setting the lower reversing part, the reversing of the lower flexible traction part is completed, through setting the movable reversing part assembly which can move upward or downward, the traction and reversing of the upper flexible traction part and the lower flexible traction part are realized, the hydraulic driving device provides power for the upward or downward movement of the movable reversing part assembly, specifically, when the hydraulic driving device drives the movable reversing part assembly to move downward, the movable reversing part assembly drives the second end of the upper flexible traction part to move upward, so as to drive the counterweight block to move upward, in this process, the lower flexible traction part is in a relaxed state, and the oil pumping rod moves downward under the action of its own gravity; when the hydraulic driving device drives the movable reversing part assembly to move upward, the movable reversing part assembly drives the second end of the lower flexible traction part to move downward, so as to drive the counterweight block to move downward, in this process, the upper flexible traction part is in a relaxed state, and the downward moving counterweight block drives the oil pumping rod to move upward through the balance flexible traction part, in the process of the downward or upward movement of the oil pumping rod, due to the setting of the hydraulic driving device and the traction and reversing of the movable reversing part assembly to the upper flexible traction part and the lower flexible traction part, the stroke of the oil pumping rod is greater than the stroke of the hydraulic driving device, that is, the movement of the oil pumping rod with a larger stroke can be realized through the hydraulic driving device with a smaller stroke, so as to reduce the stroke requirement of the hydraulic driving device and facilitate the stroke increase of the oil pumping rod. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following only some embodiments of the present utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0019] Figure 1 It is a schematic diagram of the hydraulic oil pumping machine provided by the present utility model;

[0020] Figure 2 It is a simplified schematic diagram of the hydraulic oil pumping machine in Figure 1

[0021] Figure 3 It is a movable pulley installation schematic diagram in Figure 1 ​​

[0022] Figure 4 for Figure 2 the balance flexible traction member in the figure;

[0023] Figure 5 for Figure 2 the lower flexible traction member in the figure;

[0024] Figure 6 for Figure 2 the upper flexible traction member in the figure;

[0025] In the figure: 1, rack; 2, sucker rod; 3, balance flexible traction member; 4, auxiliary reversing member; 5, upper inner fixed pulley; 6, upper reversing member; 7, counterweight; 8, lower flexible traction member; 9, upper flexible traction member; 10, lower reversing member; 11, lower inner fixed pulley; 12, hydraulic drive device; 121, cylinder body; 122, piston rod; 123, movable pulley. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0027] The present application provides a hydraulic oil pumping unit, so as to solve the problems in the prior art, reduce the stroke requirement of the hydraulic drive device, and facilitate the stroke of the sucker rod.

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] Embodiment one

[0030] As Figures 1 to 6As shown, the embodiment provides a hydraulic oil pumping unit, which comprises a frame 1, an oil pumping rod 2, an upper reversing element 6, a lower reversing element 10, a balanced flexible traction element 3, an upper flexible traction element 9, a lower flexible traction element 8, a counterweight 7, a movable reversing element assembly and a hydraulic driving device 12, the upper reversing element 6, the lower reversing element 10 and the hydraulic driving device 12 are all arranged on the frame 1, the upper reversing element 6 is arranged above the lower reversing element 10, the counterweight 7 is arranged between the upper reversing element 6 and the lower reversing element 10, the movable reversing element assembly can move upward or downward, the first end of the balanced flexible traction element 3 is fixedly connected with the oil pumping rod 2, the second end of the balanced flexible traction element 3 is fixedly connected with the counterweight 7 after passing around the upper reversing element 6, the first end of the upper flexible traction element 9 is fixedly arranged on the frame 1, the second end of the upper flexible traction element 9 is fixedly connected with the counterweight 7 after passing around the movable reversing element assembly and the upper reversing element 6 in sequence, the first end of the lower flexible traction element 8 is fixedly arranged on the frame 1, the second end of the lower flexible traction element 8 is fixedly connected with the counterweight 7 after passing around the movable reversing element assembly and the lower reversing element 10 in sequence, the hydraulic driving device 12 is in transmission connection with the movable reversing element assembly, and the hydraulic driving device 12 can drive the movable reversing element assembly to move upward or downward.

[0031] The hydraulic oil pumping unit provided by the embodiment connects the counterweight 7 and the pumping rod 2 through the balanced flexible traction member 3, and realizes the balance of the weight of the pumping rod 2 through the setting of the counterweight 7, so that the counterweight 7 and the pumping rod 2 can be kept stable and immobile without the application of external force, and at the same time, the balance of the counterweight 7 and the pumping rod 2 can be broken under the application of small external force, so that the pumping rod 2 can move downward or upward, the upward traction of the counterweight 7 is completed through the setting of the upper flexible traction member 9, the downward traction of the counterweight 7 is completed through the setting of the lower flexible traction member 8, the reversing of the balanced flexible traction member 3 and the upper flexible traction member 9 is completed through the setting of the upper reversing member 6, the reversing of the lower flexible traction member 8 is completed through the setting of the lower reversing member 10, the traction and reversing of the upper flexible traction member 9 and the lower flexible traction member 8 are realized through the setting of the movable reversing member assembly which can move upward or downward, the hydraulic driving device 12 provides power for the upward or downward movement of the movable reversing member assembly, specifically, when the hydraulic driving device 12 drives the movable reversing member assembly to move downward, the movable reversing member assembly drives the second end of the upper flexible traction member 9 to move upward, thereby driving the counterweight 7 to move upward, in this process, the lower flexible traction member 8 is in a relaxed state, and the pumping rod 2 moves downward under the action of its own gravity; when the hydraulic driving device 12 drives the movable reversing member assembly to move upward, the movable reversing member assembly drives the second end of the lower flexible traction member 8 to move downward, thereby driving the counterweight 7 to move downward, in this process, the upper flexible traction member 9 is in a relaxed state, and the downward moving counterweight 7 drives the pumping rod 2 to move upward through the balanced flexible traction member 3, in the process of the downward or upward movement of the pumping rod 2, due to the setting of the hydraulic driving device 12 and the traction and reversing of the upper flexible traction member 9 and the lower flexible traction member 8 by the movable reversing member assembly, the stroke of the pumping rod 2 is greater than the stroke of the hydraulic driving device 12, that is, the movement of the pumping rod 2 with a larger stroke can be realized through the hydraulic driving device 12 with a smaller stroke, thereby reducing the stroke requirement of the hydraulic driving device 12 and facilitating the stroke increase of the pumping rod 2.

[0032] As a more preferred embodiment of the embodiment, the movable reversing member assembly is arranged below the upper reversing member 6 and above the lower reversing member 10, so that the overall layout is compact and the space occupation is reduced.

[0033] As a more preferred embodiment of the embodiment, the movable reversing member assembly includes at least one movable pulley 123, the movable pulley 123 can move upward or downward, the movable pulley 123 can change the direction of the upper flexible traction member 9 and the lower flexible traction member 8, the hydraulic driving device 12 is in transmission connection with the movable pulley 123, and the hydraulic driving device 12 can drive the movable pulley 123 to move upward or downward, so that the structure is simple and convenient for manufacturing and using.

[0034] As a more preferred embodiment of the present embodiment, the movable reversing component assembly comprises at least two movable pulleys 123, at least one upper fixed pulley 5, and at least one lower fixed pulley 11. Each movable pulley 123 is arranged side by side, and any two adjacent movable pulleys 123 are provided with one upper fixed pulley 5 and one lower fixed pulley 11. Each upper fixed pulley 5 is arranged above each movable pulley 123, and each lower fixed pulley 11 is arranged below each movable pulley 123. The first end of the upper flexible traction member 9 is arranged above the movable pulley 123, and the second end of the upper flexible traction member 9 is alternately wound around each movable pulley 123 and each upper fixed pulley 5 and then fixedly connected with the counterweight 7 through the upper reversing component 6. The first end of the lower flexible traction member 8 is arranged below the movable pulley 123, and the second end of the lower flexible traction member 8 is alternately wound around each movable pulley 123 and each lower fixed pulley 11 and then fixedly connected with the counterweight 7 through the lower reversing component 10. According to actual working requirements, a plurality of movable pulleys 123 can be arranged to further increase the stroke of the sucker rod 2. As a more preferred embodiment of the present embodiment, when the upper flexible traction member 9 is reversed by 180 degrees each time and the lower flexible traction member 8 is reversed by 180 degrees each time, the upward distance of the sucker rod 2 is an integer multiple of the upward moving distance of the movable reversing component assembly, and the downward distance of the sucker rod 2 is an integer multiple of the downward moving distance of the movable reversing component assembly. Assuming that the number of movable pulleys 123 is n and the upward moving distance of each movable pulley 123 is s, the upward distance of the sucker rod 2 is 2ns, that is, the oil extraction stroke is 2ns, which is convenient for meeting the oil extraction operation requirements of deep oil wells.

[0035] As a more preferred embodiment of the present embodiment, the hydraulic drive device 12 comprises at least two hydraulic cylinders. The number of hydraulic cylinders is equal to the number of movable pulleys 123, and the hydraulic cylinders correspond one by one to the movable pulleys 123. The cylinder body 121 of the hydraulic cylinder is fixedly arranged on the rack 1, and the first mounting bracket is fixedly arranged on the top end of the piston rod 122 of the hydraulic cylinder. The movable pulley 123 is rotatably mounted on the first mounting bracket, so that the load of the hydraulic cylinder is small, and the loss of the hydraulic cylinder can be effectively reduced. During oil extraction, as the height of the extracted oil increases, the oil pressure of the hydraulic cylinder needs to be gradually increased to ensure the smooth upward movement of the sucker rod 2. In actual application, a hydraulic cylinder with a conventional stroke can be used to realize large-stroke oil extraction.

[0036] Further, the hydraulic oil extraction machine provided by the present embodiment further comprises an auxiliary reversing component 4 arranged on the rack 1. The auxiliary reversing component 4 is arranged above the movable reversing component assembly, and the second end of the balance flexible traction member 3 is sequentially wound around the auxiliary reversing component 4 and the upper reversing component 6 and then fixedly connected with the counterweight 7, which can reduce the arrangement difficulty of the movable reversing component assembly.

[0037] As a more preferred embodiment of the present embodiment, the upper reversing element 6 is an upper fixed pulley, the lower reversing element 10 is a lower fixed pulley, and the auxiliary reversing element 4 is an auxiliary fixed pulley; the balance flexible traction element 3 is a balance traction steel wire rope, the upper flexible traction element 9 is an upper traction steel wire rope, and the lower flexible traction element 8 is a lower traction steel wire rope, which is simple in structure and convenient to manufacture and use.

[0038] Embodiment two

[0039] The present embodiment provides a hydraulic pumping unit, which is different from the embodiment one only in the structure of the hydraulic driving device 12, in the present embodiment, the hydraulic driving device 12 comprises a hydraulic cylinder, the cylinder body 121 of the hydraulic cylinder is fixedly arranged on the rack 1, the top end of the piston rod 122 of the hydraulic cylinder is fixedly arranged with a second mounting bracket, at least two third mounting brackets are fixedly arranged on the second mounting bracket, the number of the third mounting brackets is equal to the number of the movable pulleys 123, the third mounting bracket corresponds to the movable pulley 123 one by one, and the movable pulley 123 is rotatably arranged on the third mounting bracket, which is simple in structure and convenient to centrally drive the movable pulleys 123.

[0040] Embodiment three

[0041] The present embodiment provides a hydraulic pumping unit, which is mainly different from the embodiment one in the number of the movable pulleys 123, in the present embodiment, the number of the movable pulleys 123 is one, the first end of the upper flexible traction element 9 is arranged above the movable pulley 123, the second end of the upper flexible traction element 9 is fixedly connected with the counterweight 7 after sequentially passing through the movable pulley 123 and the upper reversing element 6, the first end of the lower flexible traction element 8 is arranged below the movable pulley 123, and the second end of the lower flexible traction element 8 is fixedly connected with the counterweight 7 after sequentially passing through the movable pulley 123 and the lower reversing element 10, which is simple in structure and convenient to manufacture.

[0042] Further, the hydraulic driving device 12 comprises a hydraulic cylinder, the cylinder body 121 of the hydraulic cylinder is fixedly arranged on the rack 1, the top end of the piston rod 122 of the hydraulic cylinder is fixedly arranged with a first mounting bracket, and the movable pulley 123 is rotatably arranged on the first mounting bracket, which is simple in structure and convenient to manufacture.

[0043] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, according to the idea of the present application, the specific implementation modes and application ranges will be changed by the general technical personnel in the field. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A hydraulic oil pumping unit characterized by: The device comprises a rack, a sucker rod, an upper reversing element, a lower reversing element, a balanced flexible traction element, an upper flexible traction element, a lower flexible traction element, a counterweight, a movable reversing element assembly and a hydraulic drive device, the upper reversing element, the lower reversing element and the hydraulic drive device are arranged on the rack, the upper reversing element is arranged above the lower reversing element, the counterweight is arranged between the upper reversing element and the lower reversing element, the movable reversing element assembly can move upward or downward, the first end of the balanced flexible traction element is fixedly connected with the sucker rod, the second end of the balanced flexible traction element is fixedly connected with the counterweight after passing through the upper reversing element, the first end of the upper flexible traction element is fixedly arranged on the rack, the second end of the upper flexible traction element is fixedly connected with the counterweight after passing through the movable reversing element assembly and the upper reversing element in sequence, the first end of the lower flexible traction element is fixedly arranged on the rack, the second end of the lower flexible traction element is fixedly connected with the counterweight after passing through the movable reversing element assembly and the lower reversing element in sequence, the hydraulic drive device is in transmission connection with the movable reversing element assembly, and the hydraulic drive device can drive the movable reversing element assembly to move upward or downward.

2. The hydraulic pumping unit of claim 1, wherein: The movable reversing element assembly is arranged below the upper reversing element and above the lower reversing element.

3. The hydraulic pumping unit of claim 1, wherein: The movable reversing element assembly comprises at least one movable pulley, the movable pulley can move upward or downward, the movable pulley can change the directions of the upper flexible traction element and the lower flexible traction element, the hydraulic drive device is in transmission connection with the movable pulley, and the hydraulic drive device can drive the movable pulley to move upward or downward.

4. The hydraulic pumping unit of claim 3, wherein: The number of the movable pulley is one, the first end of the upper flexible traction element is arranged above the movable pulley, the second end of the upper flexible traction element is fixedly connected with the counterweight after passing through the movable pulley and the upper reversing element in sequence, the first end of the lower flexible traction element is arranged below the movable pulley, and the second end of the lower flexible traction element is fixedly connected with the counterweight after passing through the movable pulley and the lower reversing element in sequence.

5. The hydraulic pumping unit of claim 4, wherein: The hydraulic drive device comprises a hydraulic cylinder, the cylinder body of the hydraulic cylinder is fixedly arranged on the rack, a first mounting bracket is fixedly arranged on the top end of the piston rod of the hydraulic cylinder, and the movable pulley is rotatably mounted on the first mounting bracket.

6. The hydraulic pumping unit of claim 3, wherein: The dynamic commutating component assembly comprises at least two dynamic pulleys, at least one upper inner pulley and at least one lower inner pulley, each of the dynamic pulleys is arranged side by side, and any adjacent two of the dynamic pulleys are provided with one of the upper inner pulley and one of the lower inner pulley, each of the upper inner pulley is arranged above each of the dynamic pulleys, and each of the lower inner pulley is arranged below each of the dynamic pulleys, the first end of the upper flexible traction member is arranged above the dynamic pulley, the second end of the upper flexible traction member is alternately wound around each of the dynamic pulley and each of the upper inner pulley, and then wound around the upper commutating component and the counterweight fixedly connected, the first end of the lower flexible traction member is arranged below the dynamic pulley, and the second end of the lower flexible traction member is alternately wound around each of the dynamic pulley and each of the lower inner pulley, and then wound around the lower commutating component and the counterweight fixedly connected.

7. The hydraulic pumping unit of claim 6, wherein: The hydraulic drive device comprises at least two hydraulic cylinders, the number of the hydraulic cylinders is equal to the number of the dynamic pulleys, the hydraulic cylinders correspond to the dynamic pulleys one by one, the cylinder body of the hydraulic cylinder is fixedly arranged on the rack, the first mounting bracket is fixedly arranged on the protruding end of the piston rod of the hydraulic cylinder, and the dynamic pulley is rotatably arranged on the first mounting bracket.

8. The hydraulic pumping unit of claim 6, wherein: The hydraulic drive device comprises one hydraulic cylinder, the cylinder body of the hydraulic cylinder is fixedly arranged on the rack, the second mounting bracket is fixedly arranged on the protruding end of the piston rod of the hydraulic cylinder, at least two third mounting brackets are fixedly arranged on the second mounting bracket, the number of the third mounting brackets is equal to the number of the dynamic pulleys, the third mounting brackets correspond to the dynamic pulleys one by one, and the dynamic pulley is rotatably arranged on the third mounting bracket.

9. The hydraulic pumping unit of claim 1, wherein: The auxiliary commutating component is arranged on the rack, the auxiliary commutating component is arranged above the dynamic commutating component assembly, and the second end of the balance flexible traction member is sequentially wound around the auxiliary commutating component and the upper commutating component and then fixedly connected with the counterweight.

10. The hydraulic pumping unit of claim 9, wherein: The upper commutating component is an upper fixed pulley, the lower commutating component is a lower fixed pulley, and the auxiliary commutating component is an auxiliary fixed pulley, the balance flexible traction member is a balance traction steel wire rope, the upper flexible traction member is an upper traction steel wire rope, and the lower flexible traction member is a lower traction steel wire rope.

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