Connecting pin applied to downward barbell type pumping unit

Abstract

The utility model discloses a connecting pin applied to a downward barbell type pumping unit. Comprising a connecting pin body, a first limiting mechanism fixedly arranged at the top of the connecting pin body, a pin cap fixedly arranged at the top of the first limiting mechanism, a threaded rod fixedly arranged at the bottom of the connecting pin body and at least two second limiting mechanisms which are in threaded connection with the threaded rod and can be self-locked. The connecting pin is reasonable in structure, convenient to install and high in practicability, the first limiting mechanism and the second limiting mechanism are matched with each other, the connecting pin body can be stably limited in a pin hole in a to-be-installed position in an oil pumping unit, and therefore the connecting pin is very difficult to loosen from the pin hole and very difficult to fall off from the pin hole; the connecting firmness of the oil pumping unit is effectively improved, and meanwhile the operation stability and the use safety of the oil pumping unit can be effectively improved. The connecting device is suitable for being used when a downward barbell and a walking beam in the downward barbell type pumping unit are connected.

Description

Technical Field

[0001] The utility model relates to a connecting pin, in particular to a connecting pin used for a downward-biased barbell-type oil pumping unit. Background Art

[0002] The down-shift barbell pumping unit is a new energy-saving improvement over conventional beam pumping units. This unit incorporates a down-shift barbell at the end of the beam. This leverages the variable pitch principle of the down-shift barbell and the combined effect of the crank balancing to improve the unit's balance, thereby reducing the peak torque of the reducer and achieving a more uniform torque profile. Compared to conventional beam pumping units, the down-shift barbell unit offers a flatter and smaller net torque curve, with virtually no negative values. This significantly reduces energy consumption and has led to its widespread use in rod-type oil production operations in oil fields.

[0003] Currently, the lower barbell and the walking beam in a lower barbell-type pumping unit are fixed together by multiple connecting pins. These connecting pins consist of a stop plate, a cylindrical block secured to the stop plate, and a frustum-shaped block secured to the bottom of the cylindrical block. When installing the lower barbell, all pin holes in the flanges of the walking beam and lower barbell must be aligned. A hammer is then used to sequentially drive the connecting pins into their corresponding pin holes to ensure a secure connection between the lower barbell and the walking beam. When the down-barbell type oil pumping unit is producing oil, the down-barbell makes circular motion when it moves up and down. The load variation range between the down-barbell and the rocker is large. The connecting pin between the down-barbell and the rocker is subjected to dynamic load and large load for a long time. The connection firmness of the connecting pin is poor, and the connecting pin and the pin hole are easy to loosen. At this time, the oil pumping unit will often make clanging noises when working, which will seriously affect the stability of the oil pumping unit operation. In severe cases, the connecting pin is easy to fall off from the pin hole, which may easily cause the down-barbell to fall off and injure people. This will seriously affect the safety of the oil pumping unit and there are great safety hazards. Summary of the Invention

[0004] In order to solve the above deficiencies in the prior art, the present invention aims to provide a connecting pin for a downward-biased barbell-type oil pumping unit, which improves the firmness of the connection of the connecting pin to achieve the purpose of improving the stability of the operation of the oil pumping unit and the safety of its use.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a connecting pin used for a downward-biased barbell-type oil pumping unit, comprising a connecting pin body, a first limiting mechanism fixed on the top of the connecting pin body, a pin cap fixed on the top of the first limiting mechanism, a threaded rod fixed on the bottom of the connecting pin body, and at least two second limiting mechanisms that are threadedly connected to the threaded rod and can self-lock.

[0006] As a limitation of the present invention, the second limiting mechanism includes a first anti-retreat component threadedly connected to the threaded rod and a second anti-retreat component inserted into the threaded rod and capable of locking the first anti-retreat component, wherein the first anti-retreat component is located below the second anti-retreat component.

[0007] As a further limitation of the present invention, the first anti-backward component includes a first annular component, the inner side of the first annular component is provided with an internal thread adapted to the threaded rod, and the outer side of the first annular component is provided with a plurality of limiting grooves at intervals around the circumference.

[0008] As a further limitation of the present invention, the second anti-retreat component includes a second annular component, and a plastically deformable limiting piece is fixedly provided at each position corresponding to a plurality of limiting grooves on the second annular component. After being bent, each limiting piece can be clamped in the corresponding limiting groove to achieve locking of the first anti-retreat component.

[0009] As another limitation of the present invention, the connecting pin body includes a cylindrical block and a frustum-shaped block coaxially fixed to the bottom of the cylindrical block.

[0010] As a further limitation of the present invention, the pin cap, the cylindrical block, the frustum-shaped block and the threaded rod are integrally formed.

[0011] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0012] (1) The present invention adopts a structural form that combines a connecting pin body, a first limiting mechanism, a pin cap, a threaded rod and at least two second limiting mechanisms, wherein the at least two second limiting mechanisms can form at least two limits and each second limiting mechanism can be self-locking, which can enhance the limiting capacity of the second limiting mechanism. The first limiting mechanism and the second limiting mechanism cooperate with each other to firmly limit the connecting pin body in the pin hole at the installation position in the oil pump, which makes it extremely difficult for the present invention to loosen and fall off from the pin hole. While effectively improving the firmness of the connection of the present invention, it can also effectively improve the stability of the operation of the oil pump and the safety of use.

[0013] (2) The second limiting mechanism of the present invention includes a first anti-retreat component and a second anti-retreat component. The limiting piece in the second anti-retreat component can be bent and correspondingly locked in the limiting groove in the first anti-retreat component to form a self-locking structure, which can effectively prevent the first anti-retreat component from rotating and further effectively improve the firmness of the connection of the present invention when in use.

[0014] (3) The connecting pin body of the present invention is composed of a cylindrical block and a truncated cone block. The outer side of the truncated cone block is a tapered surface, which can be easily inserted into the pin hole. It is more convenient to use and can reduce installation time while improving the convenience of use, making it more practical.

[0015] (4) The pin cap, cylindrical block, truncated cone block and threaded rod in the present invention are integrally formed, which makes the structure of the present invention more integrated and has a higher structural bearing capacity when in use, which can effectively improve the strength of the structure of the present invention and the safety of use.

[0016] In summary, the present invention has a reasonable structure, is easy to install, and is highly practical. The first and second limiting mechanisms of the present invention cooperate to securely retain the connecting pin body within the pin hole at the intended installation location in the pumping unit. This makes the present invention extremely difficult to loosen or fall out of the pin hole, effectively improving the firmness of the connection and the operational stability and safety of the pumping unit. The present invention is suitable for use in connecting the under-deflected barbell and the walking beam in a under-deflected barbell-type pumping unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the connecting pin body in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic structural diagram of the first anti-retraction component in an embodiment of the present utility model;

[0021] Figure 4 This is a schematic structural diagram of the second anti-retraction component in an embodiment of the present utility model;

[0022] In the figure: 1, connecting pin body; 11, cylindrical block; 12, truncated cone block;

[0023] 2. First limiting mechanism; 3. Pin cap; 4. Threaded rod;

[0024] 5. First anti-retraction member; 51. First annular member; 52. Internal thread; 53. Position limiting groove;

[0025] 6. Second anti-retraction component; 61. Second annular component; 62. Limiting piece. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention and are not intended to limit the present invention.

[0027] Example: A connecting pin for a downward-biased barbell-type oil pumping unit

[0028] like Figure 1 As shown, this embodiment includes a connecting pin body 1, a first limiting mechanism 2 fixed on the top of the connecting pin body 1, a pin cap 3 fixed on the top of the first limiting mechanism 2, a threaded rod 4 fixed on the bottom of the connecting pin body 1, and at least two second limiting mechanisms that are self-locking and threadedly connected to the threaded rod 4. In this embodiment, a total of two second limiting mechanisms are provided.

[0029] like Figure 2 As shown, the connecting pin body 1 comprises a cylindrical block 11 and a truncated cone-shaped block 12 coaxially fixed to the bottom of the cylindrical block 11. The first limiting mechanism 2 utilizes a circular plate, the dimensions of which are larger than the pin hole at the intended installation location in the pumping unit. The circular plate is fixed to the end of the cylindrical block 11 away from the truncated cone-shaped block 12. The pin cap 3 is a hexagonal block, fixed to the end of the circular plate away from the cylindrical block 11. The hexagonal structure of the pin cap 3 facilitates use with a wrench.

[0030] like Figure 3 、 Figure 4As shown, the second limiting mechanism includes a first anti-backlash member 5 threadedly connected to the threaded rod 4 and a second anti-backlash member 6 inserted into the threaded rod 4 and capable of locking the first anti-backlash member 5, wherein the first anti-backlash member 5 is located below the second anti-backlash member 6. Specifically, in this embodiment, the first anti-backlash member 5 includes a first annular member 51, the inner side of which is provided with an internal thread 52 adapted to the threaded rod 4, and a plurality of limiting grooves 53 are spaced apart around the outer circumference of the first annular member 51. The limiting grooves 53 are rectangular grooves, and the size of the first annular member 51 is larger than the size of the pin hole at the location to be installed in the pumping unit. The second anti-backward component 6 includes a second annular component 61, and a plastically deformable limiting piece 62 is fixed at each position on the second annular component 61 corresponding to the plurality of limiting grooves 53. Each limiting piece 62 is adapted to the corresponding limiting groove 53 to ensure that each limiting piece 62 can be stuck in the corresponding limiting groove 53 after bending, thereby achieving the locking of the first anti-backward component 5. It should be noted here that in this embodiment, when the second anti-backward component 6 is not installed, the initial state of the second anti-backward component 6 is that each limiting piece 62 in the second anti-backward component 6 is parallel to the second annular component 61 in the second anti-backward component 6. When installed, each limiting piece 62 needs to be bent into the corresponding limiting groove 53 to achieve the locking of the first anti-backward component 5. The limiting piece 62 can be a rectangular sheet structure that can be plastically deformed, such as a stainless steel sheet or an iron sheet. In this embodiment, the limiting piece 62 is a rectangular stainless steel sheet. The size of the second annular component 61 is larger than the size of the pin hole at the position to be installed in the oil pump.

[0031] In order to improve the integrity and strength of this embodiment, the pin cap 3, the cylindrical block 11, the frustum-shaped block 12 and the threaded rod 4 in this embodiment are integrally formed.

[0032] Before using this embodiment, it is first necessary to use a crane to position the rocker and the lower barbell, ensure that all the pin holes in the flange on the rocker and the flange on the lower barbell are aligned with the center, and then install multiple embodiments of the present invention in the corresponding pin holes in sequence to achieve a stable connection between the rocker and the lower barbell.

[0033] The method of using this embodiment is as follows: hold the pin cap 3 and accurately insert the connecting pin body 1 into the pin hole and make the first limiting mechanism 2 firmly press against the position of the pin hole on the flange, and then install the two second limiting mechanisms on the threaded rod 4 in sequence, and ensure that the two second limiting mechanisms fit together and firmly press against the position of the pin hole on the flange. The installation method of the two second limiting mechanisms is the same, and here only the installation method of the second limiting mechanism close to the connecting pin body 1 is described. Specifically, first insert the second anti-backward component 6 into the threaded rod 4 and press against the position of the pin hole on the flange, then thread the first anti-backward component 5 onto the threaded rod 4 and make the first anti-backward component 5 firmly press against the second anti-backward component 6, and finally bend the multiple limiting pieces 62 in the second anti-backward component 6 downward into the corresponding limiting grooves 53 in sequence, and ensure that each limiting piece 62 is firmly opened in the corresponding limiting groove 53 to achieve locking of the first anti-backward component 5.

[0034] It should be noted that the first anti-backlash member 5 in the second limiting mechanism is threadedly connected to the threaded rod 4. The first anti-backlash member 5 may rotate and shift. The second anti-backlash member 6 in the second limiting mechanism can lock the first anti-backlash member 5 to prevent the first anti-backlash member 5 from rotating and shifting. The second limiting mechanism is firmly locked on the threaded rod 4 through its own structure, which is the self-locking referred to in this embodiment. The principle of self-locking of the two second limiting mechanisms in this embodiment is as follows: when in use, the two second limiting mechanisms are tightly fitted together and firmly pressed against the position of the pin hole on the flange. At this time, the two second anti-backlash members 6 in the two limiting mechanisms are firmly fixed on the threaded rod 4. The limiting grooves 53 in the two first anti-backlash members 5 are clamped together with the limiting pieces 62 in the corresponding second anti-backlash members 6. Therefore, when the positions of the two second anti-backlash members 6 are fixed, the two first anti-backlash members 5 can also be stably locked on the threaded rod 4.

[0035] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A connecting pin for a downward-biased barbell-type oil pumping unit, characterized by: It includes a connecting pin body, a first limiting mechanism fixed on the top of the connecting pin body, a pin cap fixed on the top of the first limiting mechanism, a threaded rod fixed on the bottom of the connecting pin body, and at least two second limiting mechanisms threadedly connected to the threaded rod and capable of self-locking.

2. The connecting pin for a downward-biased barbell-type oil pumping unit according to claim 1, characterized in that: The second limiting mechanism includes a first anti-backward component threadedly connected to the threaded rod and a second anti-backward component inserted into the threaded rod and capable of locking the first anti-backward component, wherein the first anti-backward component is located below the second anti-backward component.

3. The connecting pin for a downward-biased barbell-type oil pumping unit according to claim 2, characterized in that: The first anti-backward component includes a first annular component, the inner side of the first annular component is provided with an internal thread adapted to the threaded rod, and the outer side of the first annular component is provided with a plurality of limiting grooves at intervals around the circumference.

4. The connecting pin for a downward-biased barbell-type oil pumping unit according to claim 3, characterized in that: The second anti-retreat component includes a second annular component, and a plastically deformable limiting piece is fixed at each position corresponding to a plurality of limiting grooves on the second annular component. After being bent, each limiting piece can be clamped in the corresponding limiting groove to lock the first anti-retreat component.

5. A connecting pin for a downward-biased barbell-type oil pumping unit according to any one of claims 1 to 4, characterized in that: The connecting pin body comprises a cylindrical block and a truncated cone block coaxially fixed on the bottom of the cylindrical block.

6. The connecting pin for a downward-biased barbell-type oil pumping unit according to claim 5, characterized in that: The pin cap, the cylindrical block, the truncated cone block and the threaded rod are integrally formed.

Images