A pumping unit walking beam actuating mechanism and a pumping unit

Abstract

The present invention relates to the technical field of pumping units, and discloses a walking beam actuating mechanism of a pumping unit and a pumping unit. The walking beam actuating mechanism of the pumping unit includes: a walking beam structure having a first through hole; a walking beam having a second through hole; the first through hole and the second through hole are rotationally connected by a connecting member; an expansion sleeve connected to the walking beam and having one end extending into the first through hole; a driving mechanism connected to one end of the connecting member to drive the connecting member to rotate; the rotation of the connecting member causes the connecting member to move between a first position and a second position along the axial direction of the second through hole; when the connecting member is in the first position, the connecting member presses the expansion sleeve; when the connecting member is in the second position, the connecting member abuts and limits the walking beam structure to drive the walking beam structure to rotate. The pumping unit includes the walking beam actuating mechanism of the pumping unit. By the above technical solution, the present invention can solve the technical problem that the worm and the worm wheel in the related art are easily damaged, resulting in the locking failure of the walking beam and the walking beam structure.

Description

Technical Field

[0001] The present invention relates to the technical field of pumping units, and in particular to a walking beam motion mechanism and a pumping unit of a pumping unit. Background Art

[0002] A pumping unit is a key device used to extract crude oil from oil wells in oil exploitation, and is commonly found in onshore oil fields and offshore platforms. Its core function is to transmit the ground power to the downhole pump, overcome the oil reservoir pressure, and lift the crude oil to the ground.

[0003] The pumping unit has a walking beam and a walking beam structure. In order to facilitate the maintenance of the walking beam structure, the pumping unit in the related art allows the walking beam structure to rotate within a range of ±90° by forming a rotating pair between the walking beam structure and the front end of the walking beam. In the related art, a worm and worm gear method is mostly used to drive the rotation of the walking beam structure. However, simply using the worm and worm gear method may easily cause damage between the worm and worm gear, resulting in locking failure. Summary of the Invention

[0004] The present application discloses a walking beam motion mechanism and a pumping unit of a pumping unit to solve the technical problem that the worm and worm gear are easily damaged in the related art, resulting in locking failure of the walking beam and the walking beam structure.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application provides a walking beam motion mechanism of a pumping unit, including:

[0007] A walking beam structure having a first through hole;

[0008] A walking beam having a second through hole; the first through hole and the second through hole are rotationally connected by a connecting member so that the walking beam structure can rotate relative to the walking beam;

[0009] An expansion sleeve connected to the walking beam and having one end extending into the first through hole;

[0010] A driving mechanism connected to one end of the connecting member to drive the connecting member to rotate;

[0011] Wherein, the rotation of the connecting member causes the connecting member to move between a first position and a second position along the axial direction of the second through hole; when the connecting member is in the first position, the connecting member presses the expansion sleeve so that the outer wall of the expansion sleeve abuts and limits against the inner wall of the first through hole; when the connecting member is in the second position, the connecting member abuts and limits against the walking beam structure to drive the walking beam structure to rotate.

[0012] In some embodiments, one of a protrusion or a clamping groove is provided on the outer wall of the expansion sleeve, and the other of a protrusion or a clamping groove is provided on the inner wall of the first through hole;

[0013] When the outer wall of the expansion sleeve abuts and limits against the inner wall of the first through hole, the protrusion is embedded in the card slot.

[0014] In some solutions, the walking beam structure of the pumping unit further includes a flange, the flange is arranged on the walking beam and covers one end of the second through hole;

[0015] One end of the flange extends into the second through hole and is provided with a threaded hole, and the connecting piece has a threaded structure that cooperates with the threaded hole; and / or, there is an installation gap for clamping the expansion sleeve between the flange and the second through hole.

[0016] In some solutions, the connecting piece has an inclined portion;

[0017] The diameter of the inclined portion gradually decreases from the second position to the first position; during the process of the connecting piece moving from the second position to the first position, the inclined portion squeezes the expansion sleeve so that the outer wall of the expansion sleeve abuts and limits against the inner wall of the first through hole.

[0018] In some solutions, the connecting piece includes a connecting shaft and a driving shaft, and the connecting shaft and the driving shaft are connected by a flange;

[0019] Wherein, the inclined portion is located on the driving shaft, and the connecting shaft is connected to the driving mechanism.

[0020] In some solutions, the connecting piece has a first limiting portion, and the walking beam structure has a second limiting portion located in the first through hole;

[0021] When the connecting piece is in the second position, the rotation of the connecting piece causes the first limiting portion and the second limiting portion to abut, so as to drive the walking beam structure to rotate.

[0022] In some solutions, guiding inclined surfaces are respectively provided on the contact portions of the first limiting portion and the second limiting portion.

[0023] In some solutions, the driving mechanism includes a turntable, a worm, a worm gear and a motor;

[0024] The turntable is arranged on the walking beam and covers the other end of the second through hole; the worm gear and the worm are meshed and located in the turntable, one end of the connecting shaft is connected to the worm gear in a matching manner, and the output shaft of the motor is connected to the worm;

[0025] Wherein, the connecting shaft can move along the axial direction of the worm gear.

[0026] In some solutions, a first sealing ring is provided between the flange and / or the turntable and the walking beam;

[0027] and / or, a second sealing ring is provided at the rotational connection between the walking beam structure and the walking beam;

[0028] And / or, rollers are provided on the end face of the walking beam corresponding to the horsehead structure, and the rollers are in contact with the walking beam; or, rollers are provided on the end face of the walking beam corresponding to the horsehead structure, and the rollers are in contact with the horsehead structure;

[0029] And / or, a buffer rubber pad is provided on one side of the walking beam corresponding to the rotation direction of the horsehead structure;

[0030] And / or, a limiting plate is provided on one side where the walking beam is arranged to limit the rotation angle of the horsehead structure.

[0031] In a second aspect, the present application also provides a pumping unit, including the pumping unit horsehead action mechanism in the first aspect.

[0032] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0033] For the pumping unit horsehead action mechanism of the present application, when the connecting member is in the first position, the connecting member presses the expansion sleeve, so that the outer wall of the expansion sleeve abuts and is limited with the inner wall of the first through hole, thereby restricting the rotation between the horsehead structure and the walking beam, achieving the purpose of locking the horsehead structure. When the connecting member is in the second position, the connecting member abuts and is limited with the horsehead structure to drive the horsehead structure to rotate. When the connecting member is in the second position, the connecting member is separated from the expansion sleeve, and the expansion sleeve is restored, so that the outer wall of the expansion sleeve is separated from the inner wall of the first through hole, thereby enabling the horsehead structure to rotate relative to the walking beam. And, when the connecting member is in the second position, the connecting member abuts and is limited with the horsehead structure, so that the torque of the driving mechanism can be transmitted to the horsehead structure through the connecting member to drive the horsehead structure to rotate.

[0034] When the horsehead structure needs to be overhauled, or when the horsehead structure is in the working state, the connecting member is in the first position to lock the horsehead structure and the walking beam. When the horsehead structure needs to rotate, the connecting member is in the second position to unlock the horsehead structure and the walking beam. And, by driving the rotation of the connecting member by the driving mechanism, the horsehead structure and the walking beam can be locked or unlocked, and the operation is simple and convenient; when the connecting member is in the first position, the locking of the horsehead structure and the walking beam not only comes from the driving mechanism, but to a greater extent comes from the abutting and limiting of the outer wall of the expansion sleeve and the inner wall of the first through hole, thereby to a greater extent avoiding the situation that the locking between the horsehead structure and the walking beam fails due to damage to the worm and worm gear in the related art. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 Is an axonometric view of a pumping unit in some embodiments of the present application Figure 1 ;

[0037] Figure 2 Is Figure 1 An enlarged view of location A in

[0038] Figure 3 Is an axonometric view of a pumping unit in some embodiments of the present application Figure 2 ;

[0039] Figure 4 Is a sectional view of the walking beam motion mechanism of the pumping unit in some embodiments of the present application

[0040] Figure 5 Is Figure 4 An enlarged view of location B in

[0041] Figure 6 Is an axonometric view of a connecting piece in some embodiments of the present application

[0042] Figure 7 Is an axonometric view of the walking beam structure of the pumping unit in some embodiments of the present application

[0043] Figure 8 Is Figure 7 An enlarged view of location C in

[0044] Figure 9 Is an axonometric view of an expansion sleeve in some embodiments of the present application

[0045] Figure 10 Is an axonometric view of a flange plate in some embodiments of the present application

[0046] In the figure:

[0047] 100 - walking beam motion mechanism of the pumping unit, 110 - walking beam, 111 - second through - hole, 112 - limiting plate, 113 - buffer rubber pad, 120 - walking beam structure, 121 - first through - hole, 122 - clamping groove, 123 - second limiting part, 1231 - guiding inclined surface, 130 - connecting piece, 131 - connecting shaft, 132 - driving shaft, 1321 - inclined part, 133 - first limiting part, 140 - driving mechanism, 141 - motor, 142 - worm, 143 - worm wheel, 144 - turntable, 150 - expansion sleeve, 151 - protrusion, 160 - flange plate, 161 - threaded hole;

[0048] 200 - pumping unit Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0050] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0051] The inventor found during use that in order to facilitate the maintenance of the donkey head structure, the pumping unit in the related art allows the donkey head structure to rotate within a range of ±90° by forming a rotating pair between the donkey head structure and the front end of the walking beam. In the related art, the rotation of the donkey head structure is mostly driven by a worm and worm gear. However, the donkey head structure is affected by wind force and the vibration of the pumping unit, which has a certain impact on the coaxiality of the worm, and may easily cause damage between the worm and worm gear, resulting in locking failure.

[0052] Some embodiments of this application disclose a donkey head action mechanism 100 for a pumping unit, including a donkey head structure 120, a walking beam 110, an expansion sleeve 150, a driving mechanism 140, a connecting member 130, and a flange 160.

[0053] As Figure 5 、 Figure 7 and Figure 8 shown, the donkey head structure 120 has a first through hole 121, and the walking beam 110 has a second through hole 111. The first through hole 121 and the second through hole 111 are rotationally connected through a connecting member 130, so that the donkey head structure 120 can rotate relative to the walking beam 110. The donkey head structure 120 and the walking beam 110 form a rotating pair through the connecting member 130, so that the donkey head structure 120 can rotate within a certain range, thereby facilitating the maintenance of the donkey head structure 120.

[0054] In this embodiment, the donkey head structure 120 rotates horizontally relative to the walking beam 110 and rotates within a range of ±90°.

[0055] In this embodiment, the first through hole 121 and the second through hole 111 are coaxially arranged and have the same aperture.

[0056] As Figure 2 and Figure 5 shown, the driving mechanism 140 is connected to one end of the connecting member 130 to drive the connecting member 130 to rotate. The driving mechanism 140 is the power source for the rotation of the donkey head structure 120. The torque is transmitted to the connecting member 130 through the driving mechanism 140, and then according to the cooperation between the connecting member 130 and the donkey head structure 120, the torque is further transmitted to the donkey head structure 120 to drive the donkey head structure 120 to rotate within a certain range.

[0057] As Figure 5 shown, the expansion sleeve 150 is connected to the walking beam 110 and one end extends into the first through hole 121; the rotation of the connecting member 130 causes the connecting member 130 to move axially along the second through hole 111 between a first position and a second position; when the connecting member 130 is in the first position, the connecting member 130 presses the expansion sleeve 150 so that the outer wall of the expansion sleeve 150 abuts against and is limited by the inner wall of the first through hole 121. When the driving mechanism 140 drives the connecting member 130 to rotate, the connecting member 130 not only rotates circumferentially along itself, but also moves axially along the second through hole 111 between the first position and the second position. When the connecting member 130 is in the first position, the connecting member 130 presses the expansion sleeve 150 so that the outer wall of the expansion sleeve 150 abuts against and is limited by the inner wall of the first through hole 121, thereby restricting the rotation between the donkey head structure 120 and the walking beam 110 and achieving the purpose of locking the donkey head structure 120.

[0058] When the connecting member 130 is in the second position, the connecting member 130 abuts against and is limited by the donkey head structure 120 to drive the donkey head structure 120 to rotate. When the connecting member 130 is in the second position, the connecting member 130 is separated from the expansion sleeve 150, and the expansion sleeve 150 is restored so that the outer wall of the expansion sleeve 150 is separated from the inner wall of the first through hole 121, thereby enabling the donkey head structure 120 to rotate relative to the walking beam 110. Moreover, when the connecting member 130 is in the second position, the connecting member 130 abuts against and is limited by the donkey head structure 120, so that the torque of the driving mechanism 140 can be transmitted to the donkey head structure 120 through the connecting member 130 to drive the donkey head structure 120 to rotate.

[0059] When the donkey head structure 120 needs to be overhauled, or when the donkey head structure 120 is in the working state, the connecting piece 130 is in the first position to lock the donkey head structure 120 and the walking beam 110. When the donkey head structure 120 needs to rotate, the connecting piece 130 is in the second position to unlock the donkey head structure 120 and the walking beam 110. Moreover, by driving the rotation of the connecting piece 130 through the driving mechanism 140, the donkey head structure 120 and the walking beam 110 can be locked or unlocked, and the operation is simple and convenient; when the connecting piece 130 is in the first position, the locking of the donkey head structure 120 and the walking beam 110 not only comes from the driving mechanism 140, but to a greater extent from the abutting and limiting between the outer wall of the expansion sleeve 150 and the inner wall of the first through hole 121, thus to a greater extent avoiding the situation in the related art where the worm wheel 143 and the worm 142 are damaged and the locking between the donkey head structure 120 and the walking beam 110 fails.

[0060] Preferably in this embodiment, the expansion sleeve 150 can be made of a material with high elastic deformation recovery ability, such as thermoplastic elastomer, polyurethane elastomer and other materials, so that the expansion sleeve 150 can quickly recover after losing the external pressure.

[0061] As Figure 8 and Figure 9 As shown, one of the protrusion 151 or the card slot 122 is provided on the outer wall of the expansion sleeve 150, and the other of the protrusion 151 or the card slot 122 is provided on the inner wall of the first through hole 121; when the outer wall of the expansion sleeve 150 abuts and limits against the inner wall of the first through hole 121, the protrusion 151 is embedded in the card slot 122. Through the embedded fit of the protrusion 151 and the card slot 122, a mechanical interlock is formed during limiting, so as to better abut and limit between the first through hole 121 and the expansion sleeve 150, so as to achieve the purpose of locking the donkey head structure 120 and the walking beam 110. Correspondingly, when the expansion sleeve 150 is restored, the protrusion 151 disengages from the card slot 122, so that the donkey head structure 120 can rotate relative to the walking beam 110.

[0062] Wherein, the number of the protrusions 151 and the card slots 122 can be set to be multiple, and they are arranged at equal intervals along the circumferential direction of the expansion sleeve 150 or the first through hole 121 to further increase the abutting and limiting effect between the expansion sleeve 150 and the first through hole 121. Preferably in this embodiment, the number of the protrusions 151 and the card slots 122 is 4 respectively. It goes without saying that the number of the protrusions 151 and the card slots 122 is not limited to 4, and can also be 2, 3, 5 or others, and can be flexibly set according to actual use requirements, and this embodiment does not make a limitation in this regard.

[0063] In some embodiments, the protrusion 151 is provided on the inner wall of the first through hole 121, and the card slot 122 is provided on the outer wall of the expansion sleeve 150.

[0064] In some embodiments, a clamping groove 122 is provided on the inner wall of the first through hole 121, and a protrusion 151 is provided on the outer wall of the expansion sleeve 150.

[0065] As Figure 5 shown, the flange 160 is disposed on the walking beam 110 and covers one end of the second through hole 111. The flange 160 covers one end of the second through hole 111 to form a sealing and protective barrier there, effectively isolating external pollutants such as dust from invading the interiors of the first through hole 121 and the second through hole 111, and avoiding abnormal wear or corrosion of the first through hole 121 and the second through hole 111.

[0066] As Figure 5 and Figure 10 shown, one end of the flange 160 extends into the second through hole 111 and is provided with a threaded hole 161, and the connecting member 130 has a threaded structure that mates with the threaded hole 161. During the process of the driving mechanism 140 driving the connecting member 130 to rotate, through the threaded cooperation between the connecting member 130 and the flange 160, the connecting member 130 can move along the axial direction of the second through hole 111.

[0067] There is an installation gap between the flange 160 and the second through hole 111 for clamping the expansion sleeve 150. During the installation of the expansion sleeve 150 and the flange 160, first place a part of the expansion sleeve 150 into the first through hole 121, and then install the flange 160. An installation gap is formed between the flange 160 and the second through hole 111, so that the flange 160 clamps the expansion sleeve 150 tightly, thereby completing the fixation of the expansion sleeve 150. Correspondingly, when the expansion sleeve 150 needs to be replaced, only the flange 160 needs to be disassembled, and the replacement is simple and fast.

[0068] As Figure 5 and Figure 6 shown, the connecting member 130 has an inclined portion 1321, and the diameter of the inclined portion 1321 gradually decreases from the second position to the first position; during the process of the connecting member 130 moving from the second position to the first position, the inclined portion 1321 squeezes the expansion sleeve 150, so that the outer wall of the expansion sleeve 150 abuts and limits the position against the inner wall of the first through hole 121. When the connecting member 130 moves from the second position to the first position, as the diameter of the inclined portion 1321 gradually increases, the radial pressure on the expansion sleeve 150 is gradually increased, so that the expansion sleeve 150 expands and fits tightly against the inner wall of the first through hole 121 to form a rigid abutting and limiting position, thereby locking the walking beam structure 120 and the walking beam 110. Correspondingly, when the connecting member 130 moves from the first position to the second position, as the diameter of the inclined portion 1321 gradually decreases, the expansion sleeve 150 contracts and separates from the first through hole 121, and the walking beam structure 120 and the walking beam 110 can be unlocked.

[0069] As Figure 5 andFigure 6 As shown, the connecting member 130 includes a connecting shaft 131 and a driving shaft 132, and the connecting shaft 131 and the driving shaft 132 are connected by a flange. By including the connecting shaft 131 and the driving shaft 132 in the connecting member 130, it is convenient to quickly replace and repair the connecting shaft 131 and the driving shaft 132.

[0070] In this embodiment, the inclined portion 1321 is located on the driving shaft 132, and the connecting shaft 131 is connected to the driving mechanism 140.

[0071] As Figure 5 、 Figure 6 and Figure 8 shown, the connecting member 130 has a first limiting portion 133, and the donkey head structure 120 has a second limiting portion 123 located in the first through hole 121; when the connecting member 130 is in the second position, the rotation of the connecting member 130 causes the first limiting portion 133 and the second limiting portion 123 to abut, so as to drive the donkey head structure 120 to rotate. When the connecting member 130 is in the second position, as the connecting member 130 rotates, the first limiting portion 133 will abut against the second limiting portion 123, and then transmit the torque of the connecting member 130 to the donkey head structure 120 through the first limiting portion 133 and the second limiting portion 123, so as to drive the donkey head structure 120 to rotate.

[0072] In this embodiment, the first limiting portion 133 is located on the driving shaft 132.

[0073] As Figure 6 and Figure 8 shown, guiding inclined surfaces 1231 are respectively provided on the contact portions of the first limiting portion 133 and the second limiting portion 123. Through the guiding inclined surfaces 1231 on the contact surfaces of the first limiting portion 133 and the second limiting portion 123, progressive meshing guidance is realized at the initial stage of rotational contact, effectively dispersing the contact stress and reducing the risk of hard impact.

[0074] As Figure 2 、 Figure 3 and Figure 5 shown, the driving mechanism 140 includes a turntable 144, a worm 142, a worm gear 143 and a motor 141; the turntable 144 is arranged on the walking beam 110 and covers the other end of the second through hole 111. The turntable 144 covers the other end of the second through hole 111 to form a sealing and protective barrier there, effectively isolating external pollutants such as dust from invading the inside of the first through hole 121 and the second through hole 111 from this place, and avoiding abnormal wear or corrosion of the first through hole 121 and the second through hole 111.

[0075] As Figure 5As shown, the worm gear 143 meshes with the worm 142 and is located within the turntable 144. One end of the connecting shaft 131 is connected to the worm gear 143 in a mating manner, and the output shaft of the motor 141 is connected to the worm 142. The torque of the motor 141 is transmitted to the worm gear 143 through the worm 142, thereby driving the connecting shaft 131 to rotate. The worm 142 and the worm gear 143 are arranged within the turntable 144, which can reduce external interference and the risk of wear. Moreover, due to the self-locking property of the worm 142 and worm gear 143 structure, a certain locking force can also be provided for the walking beam structure 120 and the walking beam 110.

[0076] As Figure 5 shown, the connecting shaft 131 can move along the axial direction of the worm gear 143. The connecting shaft 131 is a part of the connecting member 130. During the rotation of the connecting member 130, it will move along the axial direction of the second through-hole 111. Therefore, through the design of the connecting shaft 131 moving along the axial direction of the worm gear 143, there will be no movement interference during the process of the connecting member 130 moving between the first position and the second position along the axial direction of the second through-hole 111.

[0077] It should be noted that since the connecting shaft 131 needs to transmit the torque of the worm gear 143 and the connecting shaft 131 can also move along the axial direction of the worm gear 143, the connecting shaft 131 has edges and corners to achieve the above purpose.

[0078] In this embodiment, the cross-section of the connecting shaft 131 is square. It goes without saying that the cross-section of the connecting shaft 131 can also be rectangular, triangular, etc., and can be flexibly set according to actual usage requirements. This embodiment does not make any limitations in this regard.

[0079] A first sealing ring is provided between the flange 160 and / or the turntable 144 and the walking beam 110. Through the first sealing ring, dynamic sealing of the joint surface between the flange 160 and / or the turntable 144 and the walking beam 110 is achieved, effectively isolating external dust, corrosive media, etc. from entering the interior of the first through-hole 121.

[0080] Preferably in this embodiment, in order to further improve the sealing performance of the walking beam actuating mechanism 100 of the pumping unit, first sealing rings are provided between both the flange 160 and the turntable 144 and the walking beam 110.

[0081] A second sealing ring is provided at the rotational connection between the walking beam structure 120 and the walking beam 110. By adding a second sealing ring at the rotational connection between the walking beam and the walking beam 110, a dynamic sealing barrier is formed, effectively isolating external dust, corrosive media, etc. from entering the interiors of the first through-hole 121 and the second through-hole 111 through the gap between the walking beam structure 120 and the walking beam 110.

[0082] Preferably, in this embodiment, in order to improve the sealing performance of the pumping unit pony head actuating mechanism 100 to a greater extent, second sealing rings are provided at both upper and lower rotational joints between the pony head structure 120 and the walking beam 110.

[0083] In some embodiments, the pony head structure 120 is provided with rollers corresponding to the end face of the walking beam 110, and the rollers are in contact with the walking beam 110.

[0084] In some embodiments, the walking beam 110 is provided with rollers corresponding to the end face of the pony head structure 120, and the rollers are in contact with the pony head structure 120.

[0085] In the above two embodiments, by designing the rollers, the rotation of the pony head structure 120 becomes smoother.

[0086] As Figure 2 shown, a buffer rubber pad 113 is provided on one side of the walking beam 110 corresponding to the rotation direction of the pony head structure 120. By adding the buffer rubber pad 113 on the rotation side of the walking beam 110, the high elasticity and damping characteristics of the rubber are used to absorb the impact energy during the rotation of the pony head structure 120, reduce the hard collision and vibration transmission between metal components, effectively reduce noise and local stress concentration, and at the same time avoid loosening or deformation of the connecting piece 130 caused by frequent impacts, improving the smooth operation of the structure.

[0087] As Figure 3 shown, a limiting plate 112 is provided on one side where the walking beam 110 is arranged to limit the rotation angle of the pony head structure 120. Through the rigid constraint of the limiting plate 112 on the side of the walking beam 110, the maximum rotation angle of the pony head structure 120 is accurately controlled so that the pony head structure 120 rotates within a specified range (±90°).

[0088] Some embodiments of the present application also disclose a pumping unit 200, as Figure 1 and Figure 3 shown, including the pumping unit pony head actuating mechanism 100.

[0089] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0090] In addition, 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. It may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0091] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A walking beam actuating mechanism of a pumping unit, characterized in that, Including: A donkey head structure having a first through hole; A walking beam having a second through hole; the first through hole and the second through hole are rotationally connected by a connecting member so that the donkey head structure can rotate relative to the walking beam; An expansion sleeve connected to the walking beam and having one end extending into the first through hole; A driving mechanism connected to one end of the connecting member to drive the connecting member to rotate; Wherein, the rotation of the connecting member causes the connecting member to move axially along the second through hole between a first position and a second position; when the connecting member is in the first position, the connecting member presses the expansion sleeve so that the outer wall of the expansion sleeve abuts and limits against the inner wall of the first through hole; when the connecting member is in the second position, the connecting member abuts and limits against the donkey head structure to drive the donkey head structure to rotate; The donkey head action mechanism of the pumping unit further includes a flange disposed on the walking beam and covering one end of the second through hole; One end of the flange extends into the second through hole and is provided with a threaded hole, and the connecting member has a threaded structure that mates with the threaded hole; The connecting member has a first limiting portion, and the donkey head structure has a second limiting portion located in the first through hole; When the connecting member is in the second position, the rotation of the connecting member causes the first limiting portion and the second limiting portion to abut, so as to drive the donkey head structure to rotate.

2. The donkey head actuating mechanism of a pumping unit according to claim 1, characterized in that, One of a protrusion or a card slot is provided on the outer wall of the expansion sleeve, and the other of a protrusion or a card slot is provided on the inner wall of the first through hole; When the outer wall of the expansion sleeve abuts and limits against the inner wall of the first through hole, the protrusion is embedded in the card slot.

3. The pumping unit walking beam actuating mechanism according to claim 2, characterized in that, There is an installation gap between the flange and the second through hole for clamping the expansion sleeve.

4. The donkey head actuating mechanism of a pumping unit according to claim 3, characterized in that, The connecting member has an inclined portion; The diameter of the inclined portion gradually decreases from the second position to the first position; during the process of the connecting member moving from the second position to the first position, the inclined portion presses the expansion sleeve so that the outer wall of the expansion sleeve abuts and limits against the inner wall of the first through hole.

5. The pumping unit walking beam actuating mechanism according to claim 4, characterized in that, The connecting member includes a connecting shaft and a driving shaft, and the connecting shaft and the driving shaft are connected by a flange; Wherein, the inclined portion is located on the driving shaft, and the connecting shaft is connected to the driving mechanism.

6. The pumping unit walking beam motion mechanism according to claim 1, wherein, Guide inclined surfaces are respectively provided on the contact portions of the first limiting portion and the second limiting portion.

7. The donkey head actuating mechanism of a pumping unit according to claim 5, characterized in that, The driving mechanism includes a turntable, a worm, a worm gear and a motor; The turntable is disposed on the walking beam and covers the other end of the second through hole; the worm gear and the worm are engaged and located in the turntable, one end of the connecting shaft is connected to the worm gear in a mating manner, and the output shaft of the motor is connected to the worm; Wherein, the connecting shaft can move axially along the worm gear.

8. The donkey head actuating mechanism of a pumping unit according to claim 7, characterized in that, A first sealing ring is provided between the flange and / or the turntable and the walking beam; And / or, a second sealing ring is provided at the rotational connection between the donkey head structure and the walking beam; And / or, a roller is provided on the end face of the donkey head structure corresponding to the walking beam, and the roller contacts the walking beam; or, a roller is provided on the end face of the walking beam corresponding to the donkey head structure, and the roller contacts the donkey head structure; And / or, a buffer rubber pad is provided on one side of the walking beam corresponding to the rotation direction of the donkey head structure; And / or, a limiting plate is provided on one side where the walking beam is arranged to limit the rotation angle of the donkey head structure.

9. A pumping unit, characterized in that, It includes the pumping unit donkey head action mechanism according to any one of claims 1-8.

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