Apparatus and method for detecting crankpin, rodpin and rod failure of a pumping unit

Abstract

The application discloses a device for detecting the failure of a crank pin, a connecting rod pin and a connecting rod of a pumping unit, which can detect whether the distance between two connecting rods changes, and when the distance between the two connecting rods changes by more than 5 mm, it is judged that at least one of the crank pin, the connecting rod pin and the connecting rod of the pumping unit has a failure, and the pumping unit is immediately stopped, so that the device can find the failure in the shortest time, and after the failure of the crank pin, the connecting rod pin and the connecting rod is found, the pumping unit can be quickly stopped, the protection of the pumping unit is realized, and the occurrence of a rollover accident of the pumping unit is avoided.

Description

Technical Field

[0001] The invention relates to the field of petroleum production equipment, in particular to a device and method for detecting faults of a crank pin, a connecting rod pin and a connecting rod of an oil pumping unit. Background Art

[0002] Beam pumping units are crucial equipment in oilfield production. Their operational characteristics are heavy loads and long-term operation. These units' primary load-bearing components are susceptible to loosening, dislodging, and breaking due to inadequate maintenance and inspection, as well as prolonged fatigue. This is particularly true of the connecting rods, which are responsible for both transmission and load bearing. If a connecting rod on one side of the unit breaks, undetected, the unit will continue to operate despite the unbalanced tension, potentially causing the entire unit to overturn and tip over. This can cause significant economic losses to oilfield operations.

[0003] Because fatigue in equipment materials is difficult to detect through manual visual inspections, most equipment fatigue failures are detected through specialized methods such as industrial flaw detection. Detection of fatigue failures typically requires suspending equipment operations for comprehensive inspections, which can be lengthy and lead to difficulties in preventing, troubleshooting, and resolving the problem. However, once such a failure occurs, it inevitably results in the serious consequence of the pumping unit tipping over and becoming scrapped. For a long time, these problems, including difficulty in preventing, troubleshooting, and resolving the problem, have remained unresolved.

[0004] Based on the above situation, there is an urgent need to provide a device that can quickly detect fatigue of oil pumping equipment. The device can quickly detect faults in the shortest time and can quickly suspend the operation of the oil pumping unit after the fault is detected, so as to protect the oil pumping equipment and prevent the oil pumping unit from tipping over. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for detecting faults of the crank pin, connecting rod pin and connecting rod of an oil pumping unit, which can quickly discover the fault in the shortest time and can quickly suspend the operation of the oil pumping unit after the fault is discovered, so as to protect the oil pumping equipment and prevent the oil pumping unit from tipping over.

[0006] On the one hand, the present application provides a device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit, comprising: a first fixing component, which is arranged on the first connecting rod of the oil pumping unit; a second fixing component, which is arranged on the second connecting rod of the oil pumping unit; a first supporting component, which is a hollow tube body, one end of which is detachably connected to the first fixing component, and the other end extends toward the direction of the second fixing component; a second supporting component, one end of which is detachably connected to the second fixing component, and the other end is inserted into the interior of the first supporting component, and can be slidably connected to one end of the first supporting component; a micro switch, which is fixedly installed on one end of the first supporting component close to the second fixing component, and the micro switch is connected in series to the control circuit of the oil pumping unit through a cable; a pressing component, which is arranged on the second supporting component and can be pressed and connected with the micro contact of the micro switch to put the micro switch in an electrically conductive state.

[0007] In some optional embodiments, the first fixing component includes a first clamp and a first fixing element, the first clamp is arc-shaped, and the first fixing element connects two ends of the first clamp.

[0008] In some optional embodiments, the second fixing component includes a second clamp and a second fixing element, the second clamp is arc-shaped, and the second fixing element connects two ends of the second clamp.

[0009] In some optional embodiments, the first supporting component is a hollow tube, and the inner diameter of the first supporting component is greater than the outer diameter of the second supporting component, so that the first supporting component and the second supporting component can slide relative to each other.

[0010] In some optional embodiments, the second supporting component is a cylindrical screw, the pressing component is provided with a threaded hole, and the screw and the threaded hole cooperate to enable the pressing component to move in the length direction of the screw.

[0011] In some optional embodiments, the pressing component includes a pressing element and a limiting element, both the pressing element and the limiting element are provided with the threaded hole, and the screw rod and the threaded hole cooperate to enable the pressing component to move in the length direction of the screw rod.

[0012] In some optional embodiments, the limiting element fits tightly against the pressing element to prevent the pressing element from being displaced after being loosened, thereby preventing a false fault alarm from occurring.

[0013] In some optional embodiments, the pressing element is a nut.

[0014] In some optional embodiments, the limiting element is ring-shaped.

[0015] On the other hand, the present invention provides a method for detecting crank pin, connecting rod pin and connecting rod failures of an oil pumping unit. By realizing the detection of crank pin, connecting rod pin and connecting rod failures of an oil pumping unit as described in any of the above items, the distance between the first connecting rod and the second connecting rod of the oil pumping unit changes by more than 5 mm, at least one of the first support component and the second support component moves away from each other, and the pressing component no longer contacts the microcontact of the microswitch, so that the microswitch is in a power-off state, and the oil pumping unit stops working.

[0016] In some optional embodiments, the distance between the first connecting rod and the second connecting rod of the oil pumping unit changes by less than 5 mm, and the pressing component always contacts the micro contact of the micro switch, so that the micro switch is in an electrically conductive state, and the oil pumping unit operates normally.

[0017] Compared with the prior art, this application has the following technical effects:

[0018] The present application provides a device for detecting fatigue failure of an oil pumping unit, comprising a first fixing component, a second fixing component, a first supporting component, a second supporting component, a micro switch, and a pressing component. The first fixing component fixes the first supporting component to the first connecting rod of the oil pumping unit, the second fixing component fixes the second supporting component to the second connecting rod of the oil pumping unit, and one end of the second supporting component is plugged into the first supporting component. When the distance between the first connecting rod and the second connecting rod changes, the distance between the first supporting component and the second supporting component also changes. When the distance between the first supporting component and the second supporting component changes by more than 5 mm, the pressing component will no longer press the micro contact of the micro switch, the micro switch is in an off state, and the oil pumping unit immediately stops working. When the distance between the first connecting rod and the second connecting rod changes by less than 5 mm, or when the distance between the first connecting rod and the second connecting rod does not change, the pressing component always presses the micro contact of the micro switch, the micro switch is in an electrically conductive state, and the oil pumping unit operates normally.

[0019] 2. The device can detect failure of at least one of the crank pin, connecting rod pin and connecting rod in the shortest possible time, and can quickly suspend the operation of the pumping unit after the failure is detected to protect the pumping equipment and prevent the pumping unit from tipping over. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic structural diagram of detecting crank pin, connecting rod pin and connecting rod faults of an oil pumping unit provided by one embodiment of the present invention;

[0023] Figure 2 This is a structural schematic diagram of a beam-type oil pumping unit provided by another embodiment of the present invention from a first perspective;

[0024] Figure 3 2 is a structural diagram of a beam-type oil pumping unit provided by another embodiment of the present invention from a second viewing angle;

[0025] Figure 4 This is a circuit diagram of a micro switch provided by another embodiment of the present invention connected in series to a pumping unit control circuit via a cable.

[0026] Figure markings: 1-first fixing component; 11-first clamp; 12-first fixing element; 2-pumping unit; 21-first connecting rod; 22-second connecting rod; 23-first counterweight; 24-support frame; 25-crossbeam; 26-crank; 27-reducer; 28-motor; 29-walking beam; 3-second fixing component; 31-second clamp; 4-first supporting component; 5-second supporting component; 6-micro switch; 7-pressing component; 71-pressing element; 72-limiting element; a-connecting rod pin; b-crank pin. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] The present invention provides a pumping unit 2, such as Figure 2As shown, it includes: a first counterweight block 23, a support frame 24, a walking beam 29, a crossbeam 25, a first connecting rod 21, a second connecting rod 22, a crank 26, a reducer 27 and a motor 28. The motor 28 and the reducer 27 are connected in a transmission manner. The two ends of the output shaft of the reducer 27 are respectively connected to the crank 26. The two connecting rods are respectively connected to the two ends of the crossbeam 25 and the two cranks 26. The two ends of the walking beam 29 are respectively connected to the first counterweight block 23 and the crossbeam 25. The support frame 24 is hinged to the walking beam 29. It also includes a device for detecting fatigue failure of the oil pumping unit 2. The two ends of the device are respectively connected to the first connecting rod 21 and the second connecting rod 22.

[0029] Specifically, the pumping unit 2 includes a first counterweight 23, a support frame 24, a walking beam 29, a crossbeam 55, a first connecting rod 21, a second connecting rod 22, a crank 26, a reducer 27, and a motor 28. The motor 38 is connected to the reducer 27 in a transmission manner. Optionally, the motor 28 and the reducer 27 are connected via a belt pulley. The output shaft of the reducer 27 is connected to a crank 26 at each end. The first connecting rod 21 and the second connecting rod 22 are connected to the ends of the crossbeam 25 and the two cranks 26, respectively. Optionally, the first connecting rod 21 is connected to one crank 26 and one end of the crossbeam 25 at each end. The first connecting rod 21 is fixed to the crossbeam 25 via a connecting rod pin a, and the first connecting rod 21 is fixed to the crank 26 via a crank pin b. The second connecting rod 22 is connected to one crank 26 and the other end of the crossbeam 25 at each end. The second connecting rod 22 is fixed to the crossbeam 25 via a connecting rod pin a, and the second connecting rod 22 is fixed to the crank 26 via a crank pin b. The two ends of the walking beam 29 are connected to the first counterweight 23 and the crossbeam 25, respectively. Optionally, one end of the walking beam 29 is connected to the first counterweight 23, and the other end is hinged to the middle of the crossbeam 25. The support frame 24 is hinged to the walking beam 29 , and the middle position of the support frame 24 and the walking beam 29 is hinged.

[0030] Further, such as Figure 3 As shown, during the operation of the pumping unit 2, it is found that the first connecting rod 21, the second connecting rod 22, the two connecting rod pins a, and the two crank pins b are relatively prone to failure. These locations are prone to failure. If any of these locations breaks, the distance between the first connecting rod 21 and the second connecting rod 22 will change. The device for detecting fatigue failure of the pumping unit 2 can quickly detect the failure in the shortest possible time by detecting the change in the distance between the first connecting rod 21 and the second connecting rod 22. After the failure is detected, the operation of the pumping unit 2 can be quickly suspended to protect the pumping equipment and prevent the pumping unit 2 from tipping over.

[0031] In some optional embodiments, the device for detecting the crank pin, connecting rod pin and connecting rod failure of the oil pumping unit is arranged parallel to the crossbeam 25. Once any one of the first connecting rod 21, the second connecting rod 22, the two connecting rod pins a and the two crank pins b has a problem, the device for detecting fatigue failure of the oil pumping unit 2 can more easily sense the change in the distance between the first connecting rod 21 and the second connecting rod 22.

[0032] The present invention also provides a device for detecting crankpin, connecting rod pin, and connecting rod failures in a pumping unit, comprising: a first fixing component 1, a second fixing component 3, a first support component 4, a second support component 5, a microswitch 6, and a pressing component 7. The first fixing component 1 is mounted on the first connecting rod 21 of the pumping unit 2. The second fixing component 3 is mounted on the second connecting rod 22 of the pumping unit 2. The first support component 4 is a hollow tube, one end of which is detachably connected to the first fixing component 1 and the other end of which extends toward the second fixing component 3. The second support component 5 has one end detachably connected to the second fixing component 3 and the other end inserted into the interior of the first support component 4, capable of slidingly connecting to one end of the first support component 4. The microswitch 6 is fixedly mounted on an end of the first support component 4 near the second fixing component 3 and is connected in series to the control circuit of the pumping unit 2 via a cable. The pressing component 7 is mounted on the second support component 5 and is capable of pressing against the microcontact of the microswitch 6 to maintain electrical conduction.

[0033] Specifically, the second support component 5 and the first support component 4 are arranged parallel to the crossbeam 35. The first support component 4 is a hollow tube, and the second support component 5 is a circular column screw. The second support component 5 is inserted into the end of the first support component 4 and is provided with a thread. The inner diameter of the first support component 4 is larger than the outer diameter of the second support component 5. When the distance between the first connecting rod 21 and the second connecting rod 22 changes, the first support component 4 and the second support component 5 can slide relative to each other. For example, the distance between the first connecting rod 21 and the second connecting rod 22 increases by a preset value, or the distance between the first connecting rod 21 and the second connecting rod 22 decreases by a preset value. The preset value can be set to 5 mm, and the pressing component 7 no longer contacts the micro contact of the micro switch 6. The micro switch 6 is in a power-off state, and the oil pump 2 stops immediately.

[0034] In some optional embodiments, the first fixing component 1 includes a first clamp 11 and a first fixing element 12 . The first clamp 11 is arc-shaped, and the first fixing element 12 connects two ends of the first clamp 11 .

[0035] Specifically, the first fixing element 12 can be a screw. The first clamp 11 is sleeved on the outer periphery of the first connecting rod 21 , and the screws connect the two ends of the first fixing element 12 so that the first clamp 11 is set at a certain position of the first connecting rod 21 .

[0036] In some optional embodiments, the second fixing component 3 includes a second clamp 31 and a second fixing element 3 . The second clamp 31 is arc-shaped, and the second fixing element 3 connects two ends of the second clamp 31 .

[0037] Specifically, the second fixing element 31 can be a screw. The second clamp 31 is sleeved on the outer periphery of the first connecting rod 21 , and the screw connects the two ends of the second fixing element 22 so that the second clamp 31 is set at a certain position of the second connecting rod 22 .

[0038] Furthermore, the first connecting rod 21 and the second connecting rod 22 have the same shape and structure. The first fixing element 12 and the second fixing element 31 are respectively arranged at the same height of the first connecting rod 21 and the second connecting rod 22 to ensure that the first supporting member 4 and the second supporting member 5 are parallel to the crossbeam 25.

[0039] In some optional embodiments, the first support component 4 is a hollow tube, and the inner diameter of the first support component 4 is larger than the outer diameter of the second support component 5, so that the first support component 4 and the second support component 5 can slide relative to each other.

[0040] Specifically, when at least one of the first support member 4 and the second support member 5 moves away from the other, or when at least one of the first support member 4 and the second support member 5 moves toward the other, the first support member 4 and the second support member 5 slide relative to each other to achieve a change in distance. When there is a gap between the inner surface of the first support member 4 and the outer surface of the second support member 5, relative movement between the two is relatively easy.

[0041] Furthermore, a cylindrical screw is provided between the first support member 4 and the first clamp 11. The first clamp 11 is provided with a threaded hole. The inner surface of the first support member 4 near the end of the first clamp 11 is provided with threads. One end of the cylindrical screw is connected to the threaded hole of the first clamp 11, and the other end is connected to the first support member 4. The cylindrical screw is provided with a limit nut, which is used to limit the position of the first support member 4. Optionally, one end of the cylindrical screw is welded to the outer surface of the first clamp 11, and the other end of the cylindrical screw is welded to the end of the first support member 4.

[0042] In some optional embodiments, the second support member 5 is a circular cylindrical screw, and the pressing member 7 is provided with a threaded hole. The screw and the threaded hole cooperate, and at least one of the second support member 5 or the pressing member rotates to achieve movement of the pressing member along the length of the screw. Optionally, the end of the second support member 5 can also be welded to the outer surface of the second clamp 31.

[0043] Specifically, the second support component 5 is a cylindrical screw, the second clamp 31 is provided with a limiting hole, the surface surrounding the limiting hole is provided with a thread, the second support component 5 and the limiting hole are threadedly connected, and the second support component 5 and the second clamp 31 are easy to install and disassemble.

[0044] Furthermore, the pressing member 7 includes a pressing element 71 and a limiting element 72. Both the pressing element 71 and the limiting element 72 are provided with threaded holes. The screw rod and the threaded holes cooperate to enable the pressing member to move along the length of the screw rod. The pressing element 71 and the limiting element 72 can both rotate around the second support member 5 to enable the pressing member to move along the length of the second support member 5.

[0045] Optionally, the pressing element 71 is a nut. The limiting element 72 is annular, and the surface of the inner through hole of the limiting element 72 is provided with threads. The limiting element 72 can be circular or polygonal. The limiting element 72 fits tightly against the pressing element 71 to prevent the pressing element 71 from loosening and moving along the screw.

[0046] Specifically, the limiting element 72 is a nut. The pressing element 71 is a circular, square or polygonal ring structure. The limiting element 72 has a locking effect here, which can limit the pressing element 71 from moving along the second support component 5.

[0047] In some optional embodiments, the end of the second support component 5 is inserted into the interior of the first support component 4, and a gap is formed between the inner surface of the first support component 4 and the outer surface of the second support component 5. The end of the second support component 5 is inserted into the interior of the first support component 4 and is movable inside the first support component 4. When the distance between the first connecting rod 21 and the second connecting rod 22 of the pumping unit 2 changes, the first connecting rod 21 drives the first fixed component 1 to move, or the second connecting rod 22 drives the second fixed component 3 to move, the first fixed component 1 drives the first support component 4 to move, or the second fixed component 3 drives the second support component 5 to move, then the second support component 5 moves relative to the first support component 4, and the micro switch 6 moves relative to the pressing component 7. The pressing component 7 no longer contacts and connects with the micro contact of the micro switch 6, and the micro switch 6 is in an off state, thereby shutting down the pumping unit 2. The device for detecting fatigue failure of the oil pumping unit 2 can quickly detect the failure in the shortest time by detecting the change in the distance between the first connecting rod 21 and the second connecting rod 22, and can quickly suspend the operation of the oil pumping unit 2 after the failure is detected, so as to protect the oil pumping equipment and prevent the oil pumping unit 2 from tipping over.

[0048] The present invention also provides a method for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit. The method for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit by any of the above methods includes: the distance between the first connecting rod 21 and the second connecting rod 22 of the oil pumping unit changes to be greater than a preset value, at least one of the first support component 4 and the second support component 5 moves in a direction away from or close to each other, the pressing component no longer contacts the micro contact of the micro switch 6, so that the micro switch 6 is in a power-off state, and the oil pumping unit stops working, thereby protecting the oil pumping equipment and preventing the oil pumping unit from tipping over. Figure 4 As shown, it is a circuit diagram of the micro switch 6 connected in series to the pumping unit control circuit.

[0049] Furthermore, the method for detecting crank pin, connecting rod pin and connecting rod failure of the oil pumping unit also includes: the distance change between the first connecting rod 21 and the second connecting rod 22 of the oil pumping unit is less than a preset value, and the pressing component 7 always contacts the micro contact of the micro switch 6, so that the micro switch 6 is in an electrically conductive state, and the oil pumping unit operates normally.

[0050] The method for installing a device for detecting crankpin, connecting rod pin, and connecting rod failures of a pumping unit includes the following steps: installing a first fixing component 1 on the first connecting rod 21 of the pumping unit 2; installing a second fixing component 3 on the second connecting rod 22 of the pumping unit 2; connecting a first support component 4 to the first fixing component 1; connecting a second support component 5 to the second fixing component 3, and inserting the first support component 4 into the interior of the second support component 5. The position of the pressing component 7 is adjusted so that when the distance between the first connecting rod 21 and the second connecting rod 22 remains unchanged, or when the distance between the first connecting rod 21 and the second connecting rod 22 changes by no more than 5 mm, the pressing component 7 can activate the microcontact of the microswitch 6, placing the microswitch 6 in the closed state. When the distance between the first connecting rod 21 and the second connecting rod 22 changes, the pressing component 7 cannot activate the microcontact of the microswitch 6, and the microcontact pops out, placing the microswitch 6 in the open state. The microswitch 6 is connected in series to the control circuit of the pumping unit 2 via a cable.

[0051] Specifically, when the pumping unit 2 is in normal motion, the distance between the first connecting rod 21 and the second connecting rod 22 remains constant. Therefore, when the pumping unit 2 is in normal motion, the pressing member 7 can always actuate the micro-contact of the micro-switch 6, thereby keeping the micro-switch 6 in the closed state.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit, characterized in that: include: A first fixing component (1) is provided on a first connecting rod (21) of the oil pumping unit (2); A second fixing component (3) is provided on a second connecting rod (22) of the oil pumping unit (2); The first supporting component (4) is a hollow tube, one end of which is detachably connected to the first fixing component (1), and the other end of which extends toward the second fixing component (3); a second supporting component (5), one end of which is detachably connected to the second fixing component (3), and the other end of which is inserted into the interior of the first supporting component (4) and can be slidably connected to one end of the first supporting component (4); a micro switch (6) fixedly mounted on one end of the first supporting component (4) close to the second fixing component (3), the micro switch (6) being connected in series to a control circuit of the oil pumping unit (2) via a cable; The pressing component (7) is arranged on the second supporting component (5) and can be pressed and connected with the micro contact of the micro switch (6) to put the micro switch (6) in an electrically conductive state.

2. The device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit according to claim 1, characterized in that: The first fixing component (1) comprises a first clamp (11) and a first fixing element (12); the first clamp (11) is arc-shaped; and the first fixing element (12) connects two ends of the first clamp (11).

3. The device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit according to claim 1, characterized in that: The second fixing component (3) comprises a second clamp (31) and a second fixing element (32); the second clamp (31) is arc-shaped; and the second fixing element (32) connects two ends of the second clamp (31).

4. The device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit according to claim 1, characterized in that: The first supporting component (4) is a hollow tube, and the inner diameter of the first supporting component (4) is larger than the outer diameter of the second supporting component (5), so that the first supporting component (4) and the second supporting component (5) can slide relative to each other.

5. The device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit according to claim 1, characterized in that: The second supporting component (5) is a cylindrical screw, and the pressing component (7) is provided with a threaded hole. The screw and the threaded hole cooperate to enable the pressing component to move in the length direction of the screw.

6. The device for detecting faults of the crank pin, connecting rod pin and connecting rod of the oil pumping unit according to claim 5, characterized in that: The pressing component (7) comprises a pressing element (71) and a limiting element (72), both of which are provided with the threaded hole, and the screw rod and the threaded hole cooperate to enable the pressing component to move in the length direction of the screw rod.

7. The device for detecting faults of the crank pin, connecting rod pin and connecting rod of the oil pumping unit according to claim 6, characterized in that: The limiting element (72) is tightly fitted with the pressing element (71), thereby preventing the pressing element (71) from being displaced after being loosened, thereby preventing a false fault alarm from occurring.

8. The device for detecting faults of the crank pin, connecting rod pin and connecting rod of the oil pumping unit according to claim 7, characterized in that: The pressing element (71) is a nut.

9. The device for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit according to claim 8, characterized in that: The limiting element (72) is annular.

10. A method for detecting crank pin, connecting rod pin and connecting rod failure of an oil pumping unit, characterized in that: The method for detecting a crank pin, a connecting rod pin, and a connecting rod failure of a pumping unit according to any one of claims 1 to 9 comprises: a distance between a first connecting rod (21) and a second connecting rod (22) of the pumping unit changes by more than 5 mm, at least one of the first supporting member (4) and the second supporting member (5) moves in a direction away from the other, The pressing component no longer contacts the micro contact of the micro switch (6), so that the micro switch (6) is in a power-off state, and the oil pumping unit stops working.

11. The method for detecting faults of a crank pin, a connecting rod pin and a connecting rod of a pumping unit according to claim 10, characterized in that: include: The distance between the first connecting rod (21) and the second connecting rod (22) of the oil pumping unit changes by less than 5 mm, and the pressing component (7) always contacts the micro contact of the micro switch (6), so that the micro switch (6) is in an electrically conductive state, and the oil pumping unit operates normally.

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