Oil pumping unit donkey head structure and oil pumping unit

Abstract

The present invention relates to the technical field of oil pumping units, and discloses an oil pumping unit donkey head structure and an oil pumping unit. The oil pumping unit donkey head structure includes: a donkey head body, which is used to connect a steel wire rope; an arc plate assembly, which is connected to the donkey head body through an adjustment assembly and is used to support and guide the movement trajectory of the steel wire rope; an adjustment assembly, which is arranged on the donkey head body and connected to the middle of the arc plate assembly; the adjustment assembly is used to drive the arc plate assembly to move radially toward the donkey head body to change the curvature of the arc plate assembly; a stop assembly, which is slidably arranged on the donkey head body and abuts against the inner side of the arc plate assembly; the stop assembly can move along the involute direction of the donkey head body to change the abutment position of the stop assembly and the arc plate assembly. The oil pump includes an oil pump donkey head structure. Through the above technical solution, the present invention can solve the technical problem in the related art that the donkey head structure has uneven friction with the steel wire rope, which causes the sucker rod to deflect.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, in particular to an oil pumping unit donkey head structure and an oil pumping unit. Background Art

[0002] Pumping units are key equipment used to extract crude oil from oil wells during oil production. They are commonly found in onshore oil fields and offshore platforms. Their core function is to transmit surface power to the downhole pump, overcoming reservoir pressure and lifting crude oil to the surface.

[0003] The donkey head of a pumping unit is one of the core components of a walking beam pumping unit. It is installed at the front end of the walking beam of the pumping unit and is connected to the sucker rod via a wire rope. The wire rope is suspended through an arc plate to connect to the sucker rod, realizing the transmission of power to the downhole pump. During the up and down strokes of the pumping unit, the friction between the wire rope and the arc plate becomes uneven, and over time, the suspension center of the wire rope gradually deviates from the designed swing center of the donkey head. When the vertical suspension position of the wire rope shifts, the sucker rod connected to it will also be subjected to force deflection and cannot maintain the ideal vertical axis state. After long-term operation, the sucker rod may bend, fatigue, or even permanently deform under the action of asymmetric loads, which not only affects the pumping efficiency, but also may shorten the service life of the downhole equipment and increase maintenance costs. Summary of the Invention

[0004] The present application discloses a donkey head structure of an oil pumping unit and an oil pumping unit, so as to solve the technical problem in the related art that the donkey head structure has uneven friction with the wire rope, which causes the pumping rod to deflect.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application discloses a donkey head structure of an oil pumping unit, comprising:

[0007] The donkey head body is used to connect the wire rope;

[0008] The arc plate assembly is connected to the donkey head body through the adjustment assembly and is used to support and guide the movement trajectory of the wire rope;

[0009] The adjusting assembly is provided on the donkey head body and connected to the middle portion of the arc plate assembly; the adjusting assembly is used to drive the arc plate assembly to move radially toward the donkey head body to change the curvature of the arc plate assembly;

[0010] The stop component is slidably arranged on the donkey head body and stops at the inner side of the arc plate component; the stop component can move along the involute direction of the donkey head body to change the stop position of the stop component and the arc plate component.

[0011] In some solutions, the arc plate assembly includes an arc plate and an adjustment plate, the arc plate is used to support and guide the movement trajectory of the wire rope, and the adjustment plate is used to stop with the stop assembly;

[0012] The adjusting plate is arranged on the inner side of the arc plate, and a plurality of gaps are arranged at intervals along the extending direction of the adjusting plate so as to make the adjusting plate bend.

[0013] In some embodiments, the donkey head body is provided with a through slot extending along the moving direction of the stop assembly; the stop assembly is slidably arranged on the outer surface of the donkey head body, and one end extends into the through slot and stops with the arc plate assembly;

[0014] And / or, the arc plate is provided with one of a clamping protrusion and a clamping groove, and the adjustment plate is provided with the other of a clamping protrusion and a clamping groove; the clamping protrusion and the clamping groove are limitedly engaged to connect the arc plate and the adjustment plate;

[0015] And / or, there are multiple stop components, which are respectively arranged on opposite sides of the donkey head body; the multiple stop components located on opposite sides of the donkey head body are arranged alternately.

[0016] In some embodiments, the adjustment assembly includes a screw rod and a connecting portion; the screw rod is rotatably arranged on the donkey head body, and the connecting portion is cooperated with the screw rod and connected to the arc plate assembly.

[0017] In some solutions, the donkey head body is provided with a first reinforcing rib connecting the radial ends of the through slot;

[0018] And / or, the donkey head body is provided with second reinforcing ribs respectively connected to the donkey head body at both radial ends of the through slot.

[0019] In some embodiments, the first reinforcing rib and / or the donkey head body are provided with a plurality of first positioning holes spaced apart along the moving direction of the connecting portion, and the connecting portion is provided with a first positioning bolt that is limitedly engaged with the first positioning hole;

[0020] And / or, the donkey head body is provided with a plurality of second positioning holes at intervals along the moving direction of the stop assembly, and the stop assembly is provided with a second positioning bolt that is limitedly matched with the second positioning hole.

[0021] In some aspects, the abutment assembly includes an abutment portion and a sliding portion;

[0022] The sliding part is slidably arranged on the donkey head body, the stop part is slidably connected to the sliding part and can move along the axial direction of the sliding part; as the stop part moves along the axial direction of the sliding part, the stop part stops or separates from the arc plate assembly.

[0023] In some embodiments, the sliding portion is provided with a plurality of locking grooves at intervals along its axial direction. As the stop portion moves, the stop portion abuts against different locking grooves to limit the stop portion from moving in a direction away from the arc plate assembly.

[0024] In some embodiments, the abutment portion includes a connecting block, a stopping block, and a locking post;

[0025] The connecting block is slidably connected to the sliding portion along the axial direction of the sliding portion and is rotatably connected to the stop block; the stop block is used to stop with the arc plate assembly;

[0026] The locking column has an elastic piece that stops and limits the locking groove, and the locking column is rotatably arranged on the connecting block; as the locking column rotates, the elastic piece is separated from the locking groove.

[0027] In a second aspect, the present application further discloses an oil pumping unit, comprising the oil pumping unit donkey head structure in the first aspect.

[0028] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0029] In the donkey head structure of the oil pumping unit of the present application, when adjusting the contact position between the wire rope and the arc plate assembly, the adjustment assembly drives the arc plate assembly toward the radial direction of the donkey head body, and the curvature of the arc plate assembly will change, thereby accurately supporting and guiding the wire rope to move along the optimized trajectory. In addition, by changing the curvature of the arc plate assembly, the contact position between the wire rope and the arc plate assembly can be changed, thereby avoiding the situation where the friction between the wire rope and the arc plate assembly becomes uneven due to long-term use. The stop assembly serves as a local deformation constraint point. In the process of adjusting the curvature of the arc plate assembly by the adjustment assembly, the position of the arc plate assembly away from the stop assembly is free to deform, while the position close to the stop assembly is constrained to only produce a slight deformation. The deformation of part of the arc plate assembly is limited by the stop assembly, so that the adjusted arc plate assembly can change the contact position of the wire rope and the arc plate assembly while satisfying the motion trajectory of the supporting and guiding wire rope; and the stop assembly can move along the involute direction of the donkey head body to change the stop position of the stop assembly and the arc plate assembly, and then the area of free deformation and the area of slight deformation of the arc plate assembly can be changed according to the adjustment requirements, so as to increase the contact area between the steel wire and the arc plate assembly and expand the wear area. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is the axonometric view of the donkey head structure of the oil pumping unit disclosed in some embodiments of this application. Figure 1 ;

[0032] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 Schematic diagram of the coordination relationship between the arc plate assembly, the adjustment assembly, and the stop assembly disclosed in some embodiments of the present application;

[0034] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0035] Figure 5 is an axonometric view of an arc plate assembly disclosed in some embodiments of the present application;

[0036] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0037] Figure 7 is an axonometric view of the curved plate and the adjustment plate disclosed in some embodiments of the present application;

[0038] Figure 8 yes Figure 7 Enlarged view of point D in the middle;

[0039] Figure 9 is an axonometric view of a stop assembly disclosed in some embodiments of the present application;

[0040] Figure 10 is a cross-sectional view of a stop assembly disclosed in some embodiments of the present application;

[0041] Figure 11 is an axonometric view of an oil pumping unit disclosed in some embodiments of the present application;

[0042] Figure 12 This is the axonometric view of the donkey head structure of the oil pumping unit disclosed in some embodiments of this application. Figure 2 .

[0043] In the picture:

[0044] 100 - pumping unit donkey head structure, 110 - donkey head body, 111 - through slot, 112 - second positioning hole, 120 - arc plate assembly, 121 - arc plate, 122 - adjustment plate, 123 - gap, 124 - clamping groove, 125 - clamping protrusion, 130 - adjustment assembly, 131 - screw rod, 132 - connecting portion, 133 - first positioning bolt, 140 - stop assembly, 141 - sliding portion, 142 - stop portion, 1421 - connecting block, 1422 - stop block, 1423 - locking column, 1424 - elastic sheet, 143 - second positioning bolt, 144 - locking slot, 150 - first reinforcing rib, 151 - first positioning hole, 160 - second reinforcing rib;

[0045] 200-pumping unit;

[0046] 300-wire rope. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0048] In the specification and claims, "and / or" means at least one of the connected objects, and the character " / " generally indicates that the previous and subsequent related objects are in an "or" relationship.

[0049] The inventors discovered during their observations of the pumping unit that during the up and down strokes of the pumping unit, the wear often exhibits unevenness due to differences in force and motion trajectory at different positions of the arc plate. Over time, this uneven wear will cause the contact area between the arc plate and the wire rope to shift, causing the suspension center of the wire rope to gradually deviate from the designed swing center of the donkey head. When the vertical suspension position of the wire rope shifts, the sucker rod connected to it will also be deflected in force and will not be able to maintain the ideal vertical axis state. After long-term operation, the sucker rod may bend, fatigue, or even permanently deform under the action of asymmetric loads, which will not only affect the pumping efficiency, but may also shorten the service life of the downhole equipment and increase maintenance costs.

[0050] The following is combined with Figures 1 to 12 , a pumping unit donkey head structure 100 and a pumping unit 200 provided in this application are described in detail through specific embodiments and their application scenarios.

[0051] Some embodiments of the present application provide a pumping unit head structure 100 , including a head body 110 , an arc plate assembly 120 , an adjustment assembly 130 and a stop assembly 140 .

[0052] like Figure 1 、 Figure 11 and Figure 12 As shown, the donkey head body 110 is arranged at the front end of the walking beam of the pumping unit 200 and is connected to the pumping rod through the wire rope 300.

[0053] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 12 As shown, the arc plate assembly 120 is connected to the donkey head body 110 through the adjustment assembly 130, and is used to support the movement trajectory of the guide wire rope 300.

[0054] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 12 As shown, the adjustment component 130 is provided on the donkey head body 110 and is connected to the middle part of the arc plate component 120; the adjustment component 130 is used to drive the arc plate component 120 to move radially toward the donkey head body 110 to change the curvature of the arc plate component 120. In the process of the adjustment component 130 driving the arc plate component 120 to move radially toward the donkey head body 110, the curvature of the arc plate component 120 will change, thereby accurately supporting and guiding the steel wire rope 300 to move along the optimized trajectory. In addition, by changing the curvature of the arc plate component 120, the contact position between the steel wire rope 300 and the arc plate component 120 can be changed, thereby avoiding the situation where the friction between the steel wire rope 300 and the arc plate component 120 becomes uneven due to long-term use.

[0055] As preferred in this embodiment, when the adjusting assembly 130 adjusts the curvature of the arc plate assembly 120 , the adjusting assembly 130 drives the arc plate assembly 120 to move along the radial direction of the donkey head body 110 toward the end of the donkey head body 110 close to the walking beam.

[0056] like Figure 4 As shown, the stop assembly 140 is provided on the donkey head body 110 and abuts against the inner side of the arc plate assembly 120. The stop assembly 140 serves as a local deformation constraint point. During the process of adjusting the curvature of the arc plate assembly 120 by the adjustment assembly 130, the arc plate assembly 120 is free to deform at locations away from the stop assembly 140, while locations close to the stop assembly 140 are constrained to only produce slight deformation. The stop assembly 140 limits the deformation of a portion of the arc plate assembly 120, so that the adjusted arc plate assembly 120 can change the contact position between the wire rope 300 and the arc plate assembly while satisfying the motion trajectory of the support and guide wire rope 300.

[0057] like Figure 2 、 Figure 3 and Figure 4 As shown, the stop assembly 140 is slidably disposed on the donkey head body 110 and can move along the involute direction of the donkey head body 110 to change the stop position of the stop assembly 140 and the arc plate assembly 120. The movable design of the stop assembly 140 allows the stop position of the stop assembly 140 and the arc plate assembly 120 to be changed, and the area of free deformation and the area of slight deformation of the arc plate assembly 120 can be changed according to adjustment requirements, thereby increasing the contact area between the wire rope 300 and the arc plate assembly 120 and expanding the wear area.

[0058] like Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the arc plate assembly 120 includes an arc plate 121 and an adjustment plate 122, which is disposed on the inner side of the arc plate 121. By disposing the adjustment plate 122 on the inner side of the arc plate 121, the cross-sectional moment of inertia can be increased, forming a composite reinforcement structure, and significantly improving the strength of the arc plate 121.

[0059] In this embodiment, the outer side of the arc plate 121 is used to support and guide the movement trajectory of the steel wire rope 300 , and the adjustment plate 122 is used to abut against the abutment assembly 140 .

[0060] like Figure 6 and Figure 8 As shown, the adjustment plate 122 is disposed inside the curved plate 121 and is provided with a plurality of slits 123 spaced apart along its extension direction to allow the adjustment plate 122 to bend. The plurality of slits 123 spaced apart inside the adjustment plate 122 form a flexible hinge structure, allowing the adjustment plate 122 to bend and deform along the nodes of the slits 123 when subjected to force. This ensures the overall structural strength of the curved plate assembly 120 while allowing the curved plate assembly 120 to bend, thereby achieving the purpose of changing the curvature of the curved plate assembly 120.

[0061] like Figure 8 As shown, the curved plate 121 is provided with one of a snap-fit protrusion 125 and a snap-fit groove 124, while the adjustment plate 122 is provided with the other of the snap-fit protrusion 125 and the snap-fit groove 124. The snap-fit protrusion 125 and the snap-fit groove 124 engage in a positional engagement to connect the curved plate 121 to the adjustment plate 122. The connection between the curved plate 121 and the adjustment plate 122 via the snap-fit protrusion 125 and the snap-fit groove 124 facilitates quick and easy assembly. Furthermore, this connection method disperses contact stress across the entire connection surface, avoiding the risk of perimeter fatigue cracking associated with traditional bolt fastening and significantly enhancing structural stability under complex working conditions.

[0062] In some embodiments, the arc plate 121 is provided with a snap-fit protrusion 125 , and the adjustment plate 122 is provided with a snap-fit groove 124 .

[0063] In some embodiments, the arc-shaped plate 121 is provided with a snap-fit groove 124 , and the adjustment plate 122 is provided with a snap-fit protrusion 125 .

[0064] like Figure 3 and Figure 4 As shown, there are multiple stop assemblies 140, which are respectively provided on opposite sides of the donkey head body 110. By providing multiple stop assemblies 140, the position where the donkey head body 110 is constrained can be increased, thereby reducing the area of free deformation and increasing the area of slight deformation. While changing the contact position between the wire rope 300 and the arc plate assembly 120, the adjusted arc plate assembly 120 can better meet the motion trajectory of the supporting and guiding wire rope 300.

[0065] like Figure 3 As shown, a plurality of stop assemblies 140 are alternately arranged on opposite sides of the donkey head body 110. By alternately arranging the plurality of stop assemblies 140, when the deformation area of the adjustment arc plate needs to be changed, the plurality of stop assemblies 140 are alternately arranged, and when the deformation area of the adjustment arc plate needs to be changed, the plurality of stop assemblies 140 are alternately arranged, and the stop points at different positions can be selectively enabled or switched, and the distribution ratio of the constraint area and the free deformation area can be dynamically adjusted, thereby further increasing the contact area between the wire rope 300 and the arc plate assembly 120.

[0066] like Figure 1 and Figure 2 As shown, the donkey head body 110 is provided with a through slot 111, which extends along the moving direction of the stop assembly 140; the stop assembly 140 is slidably arranged on the outer surface of the donkey head body 110, and one end extends into the through slot 111 and abuts against the arc plate assembly 120. By providing the through slot 111 in the donkey head body 110 and the stop assembly 140 being slidably arranged on the outer surface of the donkey head body 110, the stop assembly 140 can be stopped and limited by the arc plate assembly 120, and the position of the stop assembly 140 is also easily adjusted.

[0067] like Figure 2 As shown, the donkey head body 110 is provided with a first reinforcing rib 150 connecting the radial ends of the through slot 111. In order to facilitate the movement of the stop assembly 140, the through slot 111 is provided on the donkey head body 110. Therefore, in order to enhance the overall structure of the donkey head body 110, the first reinforcing rib 150 connecting the radial ends of the through slot 111 is provided on the donkey head body 110 to ensure that the donkey head body 110 has sufficient structural strength.

[0068] like Figure 1 As shown, the donkey head body 110 is provided with second reinforcing ribs 160 respectively connected to the donkey head body 110 at both radial ends of the through slot 111. In order to facilitate the movement of the stop assembly 140, the through slot 111 is provided on the donkey head body 110. Therefore, in order to strengthen the overall structure of the donkey head body 110, the donkey head body 110 is provided with second reinforcing ribs 160 connected to the donkey head body 110 at both radial ends of the through slot 111 to ensure that the donkey head body 110 has sufficient structural strength.

[0069] like Figure 2As shown, the adjustment assembly 130 includes a screw 131 and a connecting portion 132; the screw 131 is rotatably mounted on the donkey head body 110, and the connecting portion 132 is cooperatively mounted on the screw 131 and connected to the arc plate assembly 120. One end of the connecting portion 132 passes through the through slot 111 and connects to the arc plate assembly 120. When the curvature of the arc plate assembly 120 needs to be changed, the screw 131 is rotated, driving the connecting portion 132 to move the arc plate assembly 120 along the radial direction of the donkey head body 110, thereby adjusting the curvature of the arc plate assembly 120.

[0070] like Figure 2 As shown, the first reinforcing rib 150 and / or the donkey head body 110 are provided with a plurality of first positioning holes 151 at intervals along the moving direction of the connecting portion 132, and the connecting portion 132 is provided with a first positioning bolt 133 that is limitedly engaged with the first positioning hole 151. After the position of the arc plate assembly 120 is adjusted, the first positioning bolt 133 is limitedly engaged with the first positioning hole 151 at the corresponding position to lock the connecting portion 132 in this position, thereby avoiding the curvature change of the arc plate assembly 120 due to the relative sliding of the connecting portion 132 and the screw rod 131. Accordingly, when it is necessary to move the connecting portion 132, the first positioning bolt 133 is separated from the first positioning hole 151, and the connecting portion 132 can be driven and moved along the axial direction of the screw rod 131.

[0071] In some embodiments, the first reinforcing rib 150 is provided with a plurality of first positioning holes 151 at intervals.

[0072] In some embodiments, the donkey head body 110 is provided with a plurality of first positioning holes 151 at intervals.

[0073] In some embodiments, the first reinforcing rib 150 and the donkey head body 110 are respectively provided with a plurality of first positioning holes 151 at intervals.

[0074] like Figure 2 and Figure 9 As shown, the donkey head body 110 is provided with a plurality of second positioning holes 112 at intervals along the moving direction of the stop assembly 140, and the stop assembly 140 is provided with a second positioning bolt 143 that is limitedly matched with the second positioning hole 112. After the position of the stop assembly 140 is adjusted, the stop assembly 140 is locked in this position by the limited matching of the second positioning bolt 143 with the second positioning hole 112 at the corresponding position, so as to avoid the curvature change of the arc plate assembly 120 due to the relative movement of the stop assembly 140 and the donkey head body 110. Accordingly, when it is necessary to move the stop assembly 140, the second positioning bolt 143 is separated from the second positioning hole 112, and the stop assembly 140 can move along the arc plate assembly 120.

[0075] like Figure 9 and Figure 10As shown, the stop assembly 140 includes a stop portion 142 and a sliding portion 141. The sliding portion 141 is slidably disposed on the donkey head body 110. The stop portion 142 is slidably connected to the sliding portion 141 and can move axially along the sliding portion 141. The sliding portion 141 slides on the donkey head body 110 to change the contact position between the stop portion 142 and the arc plate assembly 120, thereby changing the free deformation area and the slight deformation area of the arc plate assembly 120. The stop portion 142 is slidably connected to the sliding portion 141. As the stop portion 142 moves axially along the sliding portion 141, the stop portion 142 stops or separates from the arc plate assembly 120.

[0076] When the stop portion 142 moves along the axial direction of the sliding portion 141 toward the inner side of the donkey head body 110, the stop portion 142 abuts against the arc plate assembly 120, and the stop portion 142 forms a local deformation constraint point. During the process of the adjustment assembly 130 adjusting the curvature of the arc plate assembly 120, the position of the arc plate assembly 120 away from the stop portion 142 is free to deform, while the position close to the stop portion 142 is constrained to only produce a slight deformation. When the stop portion 142 moves along the axial direction of the sliding portion 141 toward the outer side of the donkey head body 110, the stop portion 142 separates from the arc plate assembly 120, and the arc plate assembly 120 loses the constraint of the stop portion 142 and can deform freely. By the stop portion 142 moving along the axial direction of the sliding portion 141 and abutting or separating from the arc plate assembly 120, the distribution ratio of the constraint area and the free deformation area is dynamically adjusted, further increasing the contact area between the wire rope 300 and the arc plate assembly 120.

[0077] like Figure 9 and Figure 10 As shown, the sliding portion 141 is provided with a plurality of locking grooves 144 at intervals along its axial direction. As the stop portion 142 moves, the stop portion 142 abuts against different locking grooves 144 to limit the stop portion 142 from moving in a direction away from the arc plate assembly 120. Because the sliding portion 141 is provided with a plurality of locking grooves 144 at intervals along its axial direction, when the stop portion 142 moves along the axial direction of the sliding portion 141 toward the inner side of the donkey head body 110, the locking grooves 144 can limit the stop portion 142 from moving in a direction away from the arc plate assembly 120. As a result, the stop portion 142 will not separate from the arc plate assembly 120 during the up and down swinging of the donkey head body 110, thereby ensuring the stability of the support point of the stop portion 142 on the arc plate assembly 120.

[0078] like Figure 10As shown, the stopper 142 includes a connecting block 1421, a stopper 1422, and a locking post 1423. The connecting block 1421 is slidably connected to the sliding portion 141 along the axial direction of the sliding portion 141 and is rotationally connected to the stopper 1422. The stopper 1422 is used to abut against the arc plate assembly 120. The connecting block 1421 serves as a base, mounting the connecting block 1421 and the locking post 1423. As the connecting block 1421 moves axially along the sliding portion 141, the stopper 1422 abuts against or separates from the arc plate assembly 120. Furthermore, the rotational connection between the stopper 1422 and the connecting block 1421 allows for rolling friction between the stopper 1422 and the arc plate assembly 120 during adjustment of the contact position between the stopper 140 and the arc plate assembly 120 and during movement of the sliding portion 141. This reduces friction between the stopper 142 and the arc plate assembly 120, thereby facilitating movement of the sliding block.

[0079] like Figure 10 As shown, the locking post 1423 has an elastic piece 1424 that abuts against the locking slot 144, and the locking post 1423 is rotatably mounted on the connecting block 1421. As the locking post 1423 rotates, the elastic piece 1424 separates from the locking slot 144. As the stop portion 142 moves along the axial direction of the sliding portion 141 toward the inner side of the donkey head body 110, the elastic piece 1424 abuts against different locking slots 144 to limit the movement of the stop portion 142 away from the arc plate assembly 120, thereby ensuring the stability of the support point of the stop block 1422 on the arc plate assembly 120. When the stop block 1422 needs to be separated from the arc plate assembly 120, the locking post 1423 is rotated to separate the elastic piece 1424 from the locking slot 144. After the elastic piece 1424 separates from the locking slot 144, the stop portion 142 loses its constraint and can move freely along the axial direction of the sliding portion 141.

[0080] In this embodiment, an angle is formed between the elastic sheet 1424 and the locking column 1423. Due to the existence of the angle, when the stop portion 142 moves along the axial direction of the sliding portion 141 toward the inner side of the donkey head body 110, the bending direction of the elastic sheet 1424 is consistent with the inclination direction of the angle, and the elastic sheet 1424 can be separated from the locking groove 144 through a small deformation; however, when the stop portion 142 moves along the axial direction of the sliding portion 141 toward the outer side of the donkey head body 110, the deformation direction of the elastic sheet 1424 needs to overcome the resistance of the angle, and a larger deformation amount is required, thereby achieving the purpose of limiting the stop portion 142 from moving in the direction away from the arc plate assembly 120.

[0081] Some embodiments of the present application also provide an oil pumping unit 200, such as Figure 11 As shown, it includes a pumping unit donkey head structure 100.

[0082] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0083] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0084] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A donkey head structure of an oil pumping unit, characterized in that: include: The donkey head body is used to connect the wire rope; The arc plate assembly is connected to the donkey head body through the adjustment assembly and is used to support and guide the movement trajectory of the wire rope; An adjusting assembly is provided on the donkey head body and connected to the middle portion of the arc plate assembly; the adjusting assembly is used to drive the arc plate assembly to move radially toward the donkey head body to change the curvature of the arc plate assembly; A stop assembly is slidably disposed on the donkey head body and abuts against the inner side of the arc plate assembly; the stop assembly can move along the involute direction of the donkey head body to change the abutment position of the stop assembly and the arc plate assembly; The arc plate assembly includes an arc plate and an adjustment plate, wherein the arc plate is used to support and guide the movement trajectory of the wire rope, and the adjustment plate is used to abut against the abutment assembly; the adjustment plate is arranged on the inner side of the arc plate, and the adjustment plate is provided with a plurality of gaps along its extension direction to enable the adjustment plate to bend; The adjustment assembly includes a screw and a connecting portion; the screw is rotatably arranged on the donkey head body, and the connecting portion is matched with the screw and connected to the arc plate assembly; The stop assembly includes a stop part and a sliding part; the sliding part is slidably arranged on the donkey head body, the stop part is slidably connected to the sliding part, and can move along the axial direction of the sliding part; as the stop part moves along the axial direction of the sliding part, the stop part stops or separates from the arc plate assembly.

2. The donkey head structure of the oil pumping unit according to claim 1, characterized in that: The donkey head body is provided with a through slot, and the through slot extends along the moving direction of the stop assembly; the stop assembly is slidably arranged on the outer surface of the donkey head body, and one end extends into the through slot and stops with the arc plate assembly; And / or, the arc-shaped plate is provided with one of a clamping protrusion and a clamping groove, and the adjustment plate is provided with the other of the clamping protrusion and the clamping groove; the clamping protrusion and the clamping groove are limitedly engaged to connect the arc-shaped plate and the adjustment plate; And / or, there are multiple stop components, which are respectively arranged on two opposite sides of the donkey head body; the multiple stop components located on two opposite sides of the donkey head body are arranged alternately.

3. The donkey head structure of the oil pumping unit according to claim 2, characterized in that: The donkey head body is provided with a first reinforcing rib connecting the radial ends of the through slot; And / or, the donkey head body is provided with second reinforcing ribs respectively connected to the donkey head body at both radial ends of the through slot.

4. The donkey head structure of the oil pumping unit according to claim 3, characterized in that: The first reinforcing rib and / or the donkey head body are provided with a plurality of first positioning holes spaced apart along the moving direction of the connecting portion, and the connecting portion is provided with a first positioning bolt which is limitedly engaged with the first positioning hole; And / or, the donkey head body is provided with a plurality of second positioning holes at intervals along the moving direction of the stop assembly, and the stop assembly is provided with a second positioning bolt that is limitedly engaged with the second positioning hole.

5. The donkey head structure of the oil pumping unit according to claim 1, characterized in that: The sliding portion is provided with a plurality of locking grooves at intervals along its axial direction. As the stop portion moves, the stop portion abuts against different locking grooves to limit the stop portion from moving in a direction away from the arc plate assembly.

6. The donkey head structure of the oil pumping unit according to claim 5, characterized in that: The abutment portion includes a connecting block, a abutment block and a locking column; The connecting block is slidably connected to the sliding portion along the axial direction of the sliding portion and is rotatably connected to the stop block, and the stop block is used to stop against the arc plate assembly; The locking column has an elastic piece that stops and limits the locking groove, and the locking column is rotatably arranged on the connecting block; as the locking column rotates, the elastic piece is separated from the locking groove.

7. A pumping unit, characterized in that: The invention comprises the donkey head structure of the oil pumping unit as described in any one of claims 1 to 6.

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