Double-horse-head automatic abdicating type inspection and maintenance pumping unit

Abstract

The invention relates to the technical field of oil pumping units, in particular to a double-horsehead automatic receding type inspection and maintenance oil pumping unit which comprises a base, a rack, a first driving mechanism, a first traction rope, a second traction rope, a balance horsehead, a working horsehead and a weight box. The oil pumping unit is reasonable and compact in structure, when the oil pumping unit needs to be maintained, the weight box falls on the ground through the second driving mechanism, the weight box is separated from the first traction rope, then the receding pin moves forwards and is separated from the walking beam through the third driving mechanism, in this way, the working horsehead and the walking beam are connected in a hinged mode through the first hinge pin, and maintenance is convenient. The working horsehead can rotate relative to the walking beam, when the working horsehead is at an upper dead center, the first driving mechanism stops running, the beam hanger is pulled, the lower portion of the working horsehead rotates to the lowest point around the first hinge pin, a receding space is formed between the working horsehead and a wellhead, the purpose of receding of the working horsehead is achieved, hoisting equipment does not need to be used, and personnel do not need to climb to work; and personnel operation is safer.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, in particular to a double-head automatic-giving-way type inspection and maintenance oil pumping unit. Background Art

[0002] The double-head walking beam pumping unit is composed of many parts. The working head is the key part of the pumping unit. Its performance directly affects the projection deviation of the suspension point of the pumping unit, thereby affecting the service life of the seal between the bare rod and the wellhead Christmas tree. The balancing head is used to compensate for the load difference at the working head end. During the operation of the pumping unit, the working head and the balancing head are relatively balanced to achieve the purpose of reducing the power consumption of the motor and increasing the active power.

[0003] The oil pump generally operates continuously for 24 hours and will only be shut down for regular maintenance or when equipment malfunctions. During maintenance, the oil pump equipment needs to be kept a certain distance away from the wellhead. Generally, the distance for minor repairs is more than 700mm.

[0004] A Chinese patent document with announcement number CN201292823Y discloses a donkey head positioning device for a walking beam pumping unit, which includes a walking beam, a donkey head, a donkey head pin, a turbine, and a worm. The donkey head pin connecting the walking beam and the donkey head is located on the center line of the walking beam, two ends of the worm are installed in mounting holes on the walking beam, the worm wheel is installed on the upper end of the donkey head pin, the worm wheel is fixedly connected to the donkey head, and the donkey head positioning device for the walking beam pumping unit is installed on the lower wing plate of the walking beam; a support seat is fixedly installed on one end of the lower wing plate of the walking beam near the donkey head, and there are two parallel tie rod support frames on the support seat, the tie rod is installed in the through hole of the tie rod support frame, and an axial spring is installed on the tie rod located between the two tie rod support frames; a bracket is fixedly installed on the lower wing plate of the walking beam near the supporting end of the walking beam, and a handle is connected to the bracket through a pin shaft; one end of the wire rope is fixedly connected to the tie rod, and the other end is fixedly connected to the handle; the lower end of the donkey head pin is fixedly connected to a positioning plate, and the positioning plate has a positioning groove for the front end of the tie rod to be inserted. When the oil pump is repairing an oil well, the donkey head needs to move away from the wellhead so that the construction process is: first, pull the handle in the opposite direction of the donkey head, drive the pull rod to move through the wire rope, and pull the front end of the pull rod out of the positioning groove of the positioning plate; then, rotate the worm to drive the worm wheel and the donkey head to rotate with the donkey head pin as the axis; when the donkey head moves away from the wellhead, release the handle, and under the action of the axial spring, the front end of the pull rod presses against the positioning plate to prevent the donkey head from rotating. It can be seen that when pulling the handle, the operator still needs to climb up to operate, which poses a safety risk.

[0005] In minor repair work, the working donkey head of the traditional oil pump is manually moved out of position, that is, the balance donkey head of the oil pump is at the bottom dead center position, the oil pump is stopped, the counterweight box is removed, and then the oil pump is operated again to make the working donkey head at the bottom dead center position, the oil pump is braked, the bare rod is fixed, the bare rod and the rope hanger are separated, and then the operator needs to climb onto a working platform 3 to 6 meters high to pull out the donkey head pin. At this time, the donkey head lacks a positioning pin shaft and will swing continuously. This kind of moving-out operation has safety hazards, and personnel must work at heights, and sometimes lifting machinery and hoisting equipment are required, which is time-consuming and labor-intensive, and the maintenance cost is also high. Summary of the invention

[0006] The present invention provides a double-head automatic-yield inspection and maintenance oil pump, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of high maintenance cost and safety risk in the prior art oil pump maintenance and maintenance yielding operation.

[0007] The technical solution of the present invention is achieved through the following measures: a double-head automatic yielding inspection and maintenance oil pumping unit, comprising a base, a frame, a first driving mechanism, a first traction rope, a second traction rope, a balancing head, a working head and a counterweight box, a frame and a first driving mechanism are fixedly installed at intervals on the upper side of the base, a walking beam is hingedly installed on the upper side of the frame, a crank is fixedly installed on the outer side of the output shaft end of the first driving mechanism, a connecting rod is hingedly connected between the right part of the crank and the lower side of the left part of the walking beam, a left mounting groove opening to the right is provided on the right side of the upper part of the balancing head, the outer side of the left part of the walking beam is detachably fixedly installed in the left mounting groove, a rope drum and a second driving mechanism capable of driving the rope drum to rotate are provided on the right side of the upper part of the balancing head corresponding to the position above the walking beam, a counterweight box is provided under the balancing head, and the counterweight A first traction rope is fixedly connected between the upper side of the box and the rope drum, a right mounting groove opening to the left is provided on the left side of the upper part of the working donkey head, and a first mounting hole and a second mounting hole that pass through the front and rear are provided at intervals from top to bottom on the right front side of the working donkey head corresponding to the position of the right mounting groove, a first hinge pin rotatably mounted on the upper right end of the walking beam is passed through the first mounting hole, a yield pin rotatably mounted on the lower right end of the walking beam is passed through the second mounting hole, a third driving mechanism capable of moving the yield pin forward and backward is provided on the front side of the lower part of the working donkey head, a rope suspension device is provided below the working donkey head, a first fixed pulley is rotatably mounted on the outer side of the upper part of the working donkey head, a first end of the second traction rope is fixedly connected to the front of the rope suspension device, and the second end of the second traction rope is fixedly connected to the rear of the rope suspension device after passing around the outer side of the upper part of the first fixed pulley.

[0008] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned third driving mechanism includes a fixed seat, a yielding motor and a gear. A fixed seat is fixedly installed on the front side of the upper part of the working donkey head. The front part of the yielding pin is slidably installed in the fixed seat along the front-to-back direction. The outer side of the lower part of the yielding pin is provided with a plurality of tooth grooves opening downward at axial intervals front and back. A driving shaft is rotatably installed in the fixed seat corresponding to the position below the yielding pin. A gear meshing with the tooth groove is fixedly installed on the outer side of the driving shaft. A yielding motor is fixedly installed on the front side of the working donkey head corresponding to the right side of the fixed seat. The left end of the output shaft of the yielding motor is transmission-connected to the right end of the driving shaft.

[0009] Wear-resistant sleeves are fixedly installed on the inner sides of the front end and the rear end of the second mounting hole, each wear-resistant sleeve is sleeved on the outer side of the give way pin, a lubrication ring groove is provided on the inner side of the wear-resistant sleeve, and a plurality of radially penetrating lubrication holes are distributed at intervals along the circumferential direction on the outer side of the upper part of the wear-resistant sleeve corresponding to the position of the lubrication ring groove, and graphite columns and top screws are arranged in sequence from the inside to the outside of the lubrication hole, and a compression spring is provided between the graphite column and the inner side of the lubrication hole, and the compression spring makes the end of the graphite column abut against the outer side of the give way pin.

[0010] A fixing plate is fixedly installed on the upper side of the right part of the walking beam corresponding to the left side of the first hinge pin. The upper part of the fixing plate is provided with fixing screw holes which pass through the left and right sides. A tightening bolt is screwed into the fixing screw holes.

[0011] A left rope groove opening outward is provided on the outer side of the left portion of the above-mentioned balanced donkey head, and the bottom wall of the left rope groove is in an arc shape opening to the right, and a second fixed pulley is rotatably installed on the inner side of the upper portion of the left rope groove, and a third fixed pulley and a fourth fixed pulley are rotatably installed on the upper side of the balanced donkey head corresponding to the position above the second fixed pulley, and a lifting frame is hingedly installed on the upper side of the counterweight box, and a first movable pulley and a second movable pulley are rotatably installed in the lifting frame at intervals front and back, and the first end of the first traction rope is fixedly connected to the outer side of the front of the rope winding drum after passing through the outer side of the lower portion of the first movable pulley and the outer side of the upper portion of the third fixed pulley in sequence, and the second end of the first traction rope is fixedly connected to the outer side of the rear of the rope winding drum after passing through the outer side of the upper portion of the second fixed pulley, the outer side of the lower portion of the second movable pulley and the outer side of the upper portion of the fourth fixed pulley in sequence.

[0012] The above-mentioned second driving mechanism includes a mounting seat and an unloading motor. The mounting seat is fixedly installed on the right side of the upper part of the balancing donkey head, and the unloading motor is fixedly installed on the upper left side of the mounting seat. A rotating shaft is rotatably installed on the upper right side of the mounting seat, and the rear end of the rotating shaft is connected to the rear end of the output shaft of the unloading motor by transmission. The rope drum is fixedly installed on the outside of the rotating shaft. A third mounting hole and a fourth mounting hole that pass through the front and rear sides of the right front side of the balancing donkey head corresponding to the position of the left mounting groove are provided at upper and lower intervals. A second hinge pin that is rotatably installed with the middle part and the upper left side of the walking beam is provided in the third mounting hole. The fourth mounting hole A connecting pin with a hollow structure is provided inside and is rotatably installed together with the lower left side of the walking beam in the middle part. A connecting thread is provided on the inner side of the front part of the connecting pin. A guide groove opening outward is provided axially on the outer side of the connecting pin. A mounting sleeve is fixedly installed on the front side of the right part of the balancing donkey head corresponding to the position of the fourth mounting hole. A screw rod is provided inside the mounting sleeve, and the rear outer side is threadedly connected to the inner side of the front part of the connecting pin. A slider slidably installed in the guide groove is fixedly installed on the inner side of the rear part of the mounting sleeve. A disassembly motor is fixedly installed on the lower side of the front part of the mounting sleeve, and the upper end of the output shaft of the disassembly motor is transmission-connected to the front end of the screw rod.

[0013] A lifting beam is rotatably installed on the inner side of the lower part of the lifting frame corresponding to the position below the first movable pulley. A connecting hole is provided in the middle of the lifting beam, which passes through from top to bottom. A lifting rod is passed through the connecting hole. A locking nut is fixedly installed on the outer side of the lifting rod corresponding to the upper side of the lifting beam. A bearing is installed on the outer side of the lifting rod between the lower end of the locking nut and the upper end of the lifting beam. A connecting pipe is threaded on the outer side of the lower end of the lifting rod, and a connecting seat is fixedly installed on the center of the upper side of the counterweight box. The connecting seat is hingedly installed with the lower part of the connecting pipe.

[0014] The first driving mechanism comprises a reducer and a driving motor fixedly installed on the upper side of the base at intervals on the left and right. The front end of the output shaft of the driving motor is drivingly connected to the front part of the input shaft on the right side of the reducer, and a crank is fixedly installed on the outer side of the output shaft end of the reducer.

[0015] The first driving mechanism further comprises a control module, a right rope groove opening outward is provided on the outer side of the right part of the working donkey head, the bottom wall of the right rope groove is in an arc shape opening to the right, a first pulley frame is provided on the inner side of the upper part of the right rope groove, the first pulley frame comprises a first positioning seat, a first hanging plate, a first load sensor and a first anti-slip pin, a first positioning seat is fixedly installed on the inner side of the upper part of the right rope groove, a first hanging plate is hingedly installed on the right part of the first positioning seat, the first hanging plate is in a U shape opening downward, a first load sensor is fixedly installed on the inner side of the upper part of the first hanging plate, a first fixed pulley is rotatably installed on the outer side of the middle part of the first load sensor, and a first anti-slip pin is fixedly installed on the lower part of the first hanging plate corresponding to the position below the first load sensor; A second pulley frame is provided in the left rope groove corresponding to the lower left position of the third fixed pulley, the second pulley frame includes a second positioning seat, a second hanging plate, a second load sensor and a second anti-slip pin, a second positioning seat is fixedly installed on the inner side of the upper part of the left rope groove, a second hanging plate is hingedly installed on the left part of the second positioning seat, the second hanging plate is in a U-shape with an opening downward, a second load sensor is fixedly installed on the inner side of the upper part of the second hanging plate, the second fixed pulley is rotatably installed on the outer side of the middle part of the second load sensor, a second anti-slip pin is fixedly installed on the lower part of the second hanging plate corresponding to the position below the second load sensor, the first load sensor and the second load sensor are both connected to the control module, and the control module is respectively connected to the driving motor, the yielding motor, the unloading motor and the disassembly motor.

[0016] The structure of the present invention is reasonable and compact. The third driving mechanism enables the yield pin to move backward and then be rotated and installed together with the lower side of the right end of the rocker. In this way, the working donkey head and the right part of the rocker can be fixed together through the first hinge pin and the yield pin. When the oil pump needs to be repaired, the load at the working donkey head end is first unloaded, and the counterweight box is dropped to the ground by the second driving mechanism to separate the counterweight box from the first traction rope. Then, the third driving mechanism is used to move the yield pin forward and separate it from the rocker. In this way, the working donkey head and the rocker are hingedly connected by the first hinge pin, and the working donkey head can rotate relative to the rocker. At the top dead center, the first driving mechanism stops running, the suspension rope is pulled, and the lower part of the working donkey head is wound around The first hinge pin rotates to the lowest point, and a clearance space is formed between the working donkey head and the wellhead, thereby achieving the purpose of the working donkey head giving way. In this way, the working donkey head can automatically give way without using lifting equipment and personnel doing high-altitude work, which greatly saves economic costs and makes personnel operation safer. After the maintenance work is completed, the working donkey head is reset by the first driving mechanism, and the clearance pin is moved backward by the third driving mechanism to fix the walking beam and the working donkey head together, and then the counterweight box is fixedly connected to the first traction rope, and then the second driving mechanism is used to lift the counterweight box to the set height. This not only reduces the labor intensity of personnel, but also improves work efficiency and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the main structure when using embodiments one to nine of the present invention.

[0018] Attached Figure 2 It is a schematic diagram of the front cross-sectional structure when using embodiments one to nine of the present invention.

[0019] Attached Figure 3 It is a schematic diagram of the three-dimensional structure when using embodiments 1 to 9 of the present invention.

[0020] Attached Figure 4 It is a schematic diagram of the main cross-sectional structure of the working donkey head in embodiments 1 to 9 of the present invention.

[0021] Attached Figure 5 It is a schematic diagram of the left side cross-sectional structure of the yield pin in Embodiments 2 to 9 of the present invention.

[0022] Attached Figure 6 It is a schematic diagram of the three-dimensional structure of the yield pin in Embodiments 2 to 9 of the present invention.

[0023] Attached Figure 7 It is a schematic diagram of the left side cross-sectional structure of the wear-resistant sleeve in embodiments three to nine of the present invention.

[0024] Attached Figure 8 It is a schematic diagram of the partial cross-sectional structure of the front view of the right end of the midstream beam in embodiments four to nine of the present invention.

[0025] Attached Fig. 9 It is a schematic diagram of the front cross-sectional structure of the balanced donkey head in embodiments five to nine of the present invention.

[0026] Attached Fig.10 It is a schematic diagram of the left side cross-sectional structure of the connecting pin in embodiments six to nine of the present invention.

[0027] Attached Fig.11 It is a schematic diagram of the front cross-sectional structure of the connecting pin in embodiments six to nine of the present invention.

[0028] Attached Fig.12 It is a schematic diagram of the left side cross-sectional structure of the hanging frame in Embodiments 7 to 9 of the present invention.

[0029] Attached Fig.13 It is a left-side structural schematic diagram of the connecting rod in Embodiments 8 to 9 of the present invention.

[0030] Attached Fig.14 This is a schematic diagram of the front structural view of the first pulley frame in Embodiment 9 of the present invention.

[0031] Attached Fig.15 This is a schematic diagram of the front structural view of the first pulley frame in Embodiment 9 of the present invention.

[0032] Attached Fig.16 This is a schematic diagram of the circuit structure of Embodiment 9 of the present invention.

[0033] The codes in the accompanying drawings are: 1 is a base, 2 is a frame, 3 is a first traction rope, 4 is a second traction rope, 5 is a balancing donkey head, 6 is a working donkey head, 7 is a counterweight box, 8 is a walking beam, 9 is a crank, 10 is a connecting rod, 11 is a left mounting groove, 12 is a rope drum, 13 is a right mounting groove, 14 is a first hinge pin, 15 is a yield pin, 16 is a rope hanger, 17 is a first fixed pulley, 18 is a fixed seat, 19 is a yield motor, 20 is a gear, 21 is a tooth groove, 22 is a drive shaft, 23 is a wear-resistant sleeve, 24 is a lubrication ring groove, 25 is a graphite column, 26 is a top screw, 27 is a compression spring, 28 is a first lower hinge seat, 29 is a first upper hinge seat, 30 is a first support seat, 31 is a fixing plate, 32 is a tightening bolt, 33 is a second fixed pulley, 34 is a third fixed pulley, 35 is a fourth Fixed pulley, 36 is the first movable pulley, 37 is the second movable pulley, 38 is the lifting frame, 39 is the mounting seat, 40 is the unloading motor, 41 is the rotating shaft, 42 is the right rope groove, 43 is the second hinge pin, 44 is the connecting pin, 45 is the guide groove, 46 is the mounting sleeve, 47 is the slider, 48 is the screw rod, 49 is the disassembly and assembly motor, 50 is the lifting beam, 51 is the lifting rod, 52 is the locking nut, 53 is the bearing, 54 is the connecting pipe, 55 is the connecting seat, 56 is the reducer, 57 is the driving motor, 58 is the tail shaft, 59 is the pin shaft, 60 is the reinforcing pipe, 61 is the connecting plate, 62 is the first load sensor, 63 is the second load sensor, 64 is the first positioning seat, 65 is the second positioning seat, 66 is the first hanging plate, 67 is the second hanging plate, 68 is the first anti-drop pin, and 69 is the second anti-drop pin. DETAILED DESCRIPTION

[0034] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0035] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0036] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figures 1 to 4As shown, the double-head automatic yielding inspection and maintenance oil pumping unit includes a base 1, a frame 2, a first driving mechanism, a first traction rope 3, a second traction rope 4, a balancing head 5, a working head 6 and a counterweight box 7. The frame 2 and the first driving mechanism are fixedly installed on the upper side of the base 1 at intervals. A walking beam 8 is hingedly installed on the upper side of the frame 2. A crank 9 is fixedly installed on the outer side of the output shaft end of the first driving mechanism. A connecting rod 10 is hingedly connected between the right part of the crank 9 and the lower side of the left part of the walking beam 8. A left mounting groove 11 with an opening to the right is provided on the upper right side of the balancing head 5. The outer side of the left part of the walking beam 8 can be detachably fixedly installed in the left mounting groove 11. A rope drum 12 and a second driving mechanism capable of driving the rope drum 12 to rotate are provided on the upper right side of the balancing head 5 corresponding to the position above the walking beam 8. A counterweight box 7 is provided below the balancing head 5. The upper side of the counterweight box 7 is connected to the rope drum 12. A first traction rope 3 is fixedly connected thereto, a right mounting groove 13 opening to the left is provided on the upper left side of the working donkey head 6, and a first mounting hole and a second mounting hole that pass through the front and rear are provided at intervals from top to bottom on the right front side of the working donkey head 6 corresponding to the position of the right mounting groove 13, a first hinge pin 14 is passed through the first mounting hole and a first hinge pin 14 is rotatably mounted on the upper right end of the walking beam 8, and a yield pin 15 is rotatably mounted on the lower right end of the walking beam 8 is passed through the second mounting hole, a third driving mechanism capable of moving the yield pin 15 forward and backward is provided on the front side of the lower part of the working donkey head 6, a rope suspension device 16 is provided below the working donkey head 6, and a first fixed pulley 17 is rotatably mounted on the outer side of the upper part of the working donkey head 6, a first end of the second traction rope 4 is fixedly connected to the front of the rope suspension device 16, and a second end of the second traction rope 4 is fixedly connected to the rear of the rope suspension device 16 after passing around the outer side of the upper part of the first fixed pulley 17.

[0037] According to the needs, the counterweight box 7 is an existing well-known technology. There are multiple installation compartments for installing counterweight blocks in the counterweight box 7. The first traction rope 3 and the second traction rope 4 are both existing well-known steel wire ropes. A buffer platform can be provided under the counterweight box 7 to support the counterweight box 7 after disassembly.

[0038] During use, the third driving mechanism causes the yield pin 15 to move backward and then rotate and install together with the lower right end of the rocker 8, so that the working donkey head 6 and the right part of the rocker 8 can be fixed together through the first hinge pin 14 and the yield pin 15. When the oil pump needs to be repaired, the load of the working donkey head 6 is first unloaded, and the counterweight box 7 is dropped to the ground by the second driving mechanism to separate the counterweight box 7 from the first traction rope 3, and then the third driving mechanism is used to move the yield pin 15 forward and separate it from the rocker 8. In this way, the working donkey head 6 and the rocker 8 are hingedly connected by the first hinge pin 14, and the working donkey head 6 can rotate relative to the rocker 8. At the top dead center, the first driving mechanism stops running, the rope hanger 16 is pulled, and the working donkey head 6 The lower part rotates to the lowest point around the first hinge pin 14, and a clearance space is formed between the working donkey head 6 and the wellhead, thereby achieving the purpose of giving way to the working donkey head 6. In this way, there is no need to use lifting equipment and personnel do not need to work at heights to achieve automatic giving way of the working donkey head 6, which greatly saves economic costs and makes personnel operation safer. After the maintenance work is completed, the working donkey head 6 is reset through the first driving mechanism, and the clearance pin 15 is moved backward through the third driving mechanism to fix the walking beam 8 and the working donkey head 6 together, and then the counterweight box 7 is fixedly connected to the first traction rope 3, and then the second driving mechanism is used to lift the counterweight box 7 to the set height. This not only reduces the labor intensity of personnel, but also improves the working efficiency and reduces the maintenance cost.

[0039] According to actual needs, the above double-donkey-head automatic-yield inspection and maintenance pumping unit can be further optimized and / or improved: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figures 1 to 6 As shown, the third driving mechanism includes a fixed seat 18, a yielding motor 19 and a gear 20. The fixed seat 18 is fixedly installed on the front side of the upper part of the working donkey head 6. The front part of the yielding pin 15 is slidably installed in the fixed seat 18 along the front-to-back direction. The outer side of the lower part of the yielding pin 15 is provided with a plurality of tooth grooves 21 opening downward at intervals along the axial front-to-back direction. A driving shaft 22 is rotatably installed in the fixed seat 18 corresponding to the position below the yielding pin 15. A gear 20 meshing with the tooth groove 21 is fixedly installed on the outer side of the driving shaft 22. The yielding motor 19 is fixedly installed on the front side of the working donkey head 6 corresponding to the right side of the fixed seat 18. The left end of the output shaft of the yielding motor 19 is transmission-connected to the right end of the driving shaft 22.

[0040] According to the requirements, the cross section of the give way pin 15 is circular, and the give way pin 15 can be an existing well-known cylindrical rack. In this embodiment, the give way pin 15, the gear 20, the drive shaft 22 and the fixed seat 18 can form an existing well-known SP rack synchronous lifter, the give way motor 19 can be an existing well-known worm gear reduction motor, and the fixed seat 18 can be a box structure. The right end of the drive shaft 22 passes through the right side of the fixed seat 18 and is connected to the output shaft of the give way motor 19 through a coupling transmission. The meshing portion of the gear 20 and the tooth groove 21 is in the fixed seat 18, so that the meshing portion of the gear 20 and the tooth groove 21 can be Lubrication can be performed and the give-way pin 15 can be constrained so that the tooth groove 21 and the gear 20 are always in a meshing state. In this way, the give-way motor 19 can drive the give-way pin 15 to move forward or backward when working, thereby separating the give-way pin 15 from the right part of the rocker 8 or rotating and installing the give-way pin 15 and the lower side of the right end of the rocker 8 together. When the give-way pin 15 is separated from the right part of the rocker 8, the working donkey head 6 can rotate relatively under the action of the rocker 8 and the first hinge pin 14. After the upper part of the working donkey head 6 rotates downward, the requirement that the oil pumping unit should keep a certain distance from the wellhead during maintenance can be met, which is convenient for minor repairs.

[0041] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 5 , 7 As shown, wear-resistant sleeves 23 are fixedly installed on the inner sides of the front end and the rear end of the second mounting hole, each wear-resistant sleeve 23 is sleeved on the outer side of the give way pin 15, a lubrication ring groove 24 is provided on the inner side of the wear-resistant sleeve 23, and a plurality of radially penetrating lubrication holes are distributed along the circumferential direction at intervals on the outer side of the upper part of the wear-resistant sleeve 23 corresponding to the position of the lubrication ring groove 24, and graphite columns 25 and top screws 26 are arranged in sequence in the lubrication holes from the inside to the outside, and a compression spring 27 is provided between the graphite column 25 and the inner side of the lubrication hole, and the compression spring 27 makes the end of the graphite column 25 abut against the outer side of the give way pin 15.

[0042] According to requirements, the outer side of the top screw 26 is screwed into the lubrication hole, and the graphite column 25 is slidably installed in the lubrication hole. The graphite column 25 can be a T-shaped structure with a thick outside and a thin inside. There is a step in the lubrication hole. The compression spring 27 is installed between the step of the lubrication hole and the step of the graphite column 25. The compression spring 27 can also be installed between the outer end of the graphite column 25 and the inner end of the top screw 26. The top screw 26 is used to make the end of the graphite column 25 against the outer side of the give way pin 15 through the compression spring 27.

[0043] During use, by setting the wear-resistant sleeve 23, the yield pin 15 can be supported and limited, and the tooth groove 21 of the yield pin 15 and the gear 20 can be ensured to mesh with each other. In this way, when the yield motor 19 is working, the yield pin 15 can move forward or backward quickly, and the end cover can be fixedly installed on the outer side of the front end of the yield pin 15, so that the yield pin 15 and the gear 20 can be protected to prevent sand and dust from entering the fixed seat 18 and causing wear on the yield pin 15 and the gear 20. In the case of no power or failure of the yield motor 19, the yield pin 15 can be moved forward or backward through the end cover. When the yield pin 15 moves forward and backward, the graphite powder generated by the mutual wear between the graphite column 25 and the yield pin 15 is filled in the lubrication ring groove 24, so that the graphite powder can lubricate the yield pin 15 and the wear-resistant sleeve 23 and extend the service life.

[0044] In order to facilitate the disassembly and assembly between the walking beam 8 and the working donkey head 6, a first disassembly and assembly part is provided on the upper right side of the walking beam 8, and the first disassembly and assembly part includes a first lower hinge seat 28 and a first upper hinge seat 29. Two first lower hinge seats 28 are fixedly installed at intervals at the front and rear sides of the upper right side of the walking beam 8. A first U-shaped hinge groove with an opening upward is provided on the upper side of each first lower hinge seat 28. The front outer side and the rear outer side of the first hinge pin 14 are rotatably installed in the first hinge groove at the corresponding position. The first upper hinge seat 29 is installed on the inner side of the upper part of the right mounting groove 13 between the two first lower hinge seats 28. The lower middle side of the first upper hinge seat 29 A second hinge groove is provided which opens downward and is arc-shaped. The outer middle part of the first hinge pin 14 is rotatably installed in the second hinge groove. A first support seat 30 is fixedly installed on the lower right side of the walking beam 8 corresponding to the position of the second mounting hole. The first support seat 30 is π-shaped. A support hole which passes through the front and rear is provided at the lower part of the first support seat 30. The outer middle part of the give way pin 15 is rotatably installed in the support hole. A gap is provided between the end of the wear-resistant sleeve 23 and the side surface of the first support seat 30. A second disassembly and assembly part with the same structure as the first disassembly and assembly part is provided on the upper left side of the walking beam 8, and a second support seat with the same structure as the first support seat 30 is provided on the lower left side of the walking beam 8.

[0045] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in , 3 and 8, a fixing plate 31 is fixedly installed on the upper right side of the walking beam 8 corresponding to the left side of the first hinge pin 14. The upper part of the fixing plate 31 is provided with fixing screw holes that pass through the left and right sides, and a tightening bolt 32 is screwed into the fixing screw hole.

[0046] According to the requirements, the fixing plate 31 can be in an inverted L shape, and the left front part and the left rear part of the fixing plate 31 are both fixed with reinforcing ribs. During use, the right end of the tightening bolt 32 contacts the left upper part of the working donkey head 6. When the yielding pin 15 is separated from the walking beam 8, the right end of the tightening bolt 32 can tighten the left upper part of the working donkey head 6, so that the working donkey head 6 will not swing toward the wellhead, avoiding the working donkey head 6 from swinging continuously after the yielding pin 15 is separated from the walking beam 8, which may cause safety hazards in the yielding operation.

[0047] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in , 3 and 9, a left rope groove opening outward is provided on the outer side of the left portion of the balancing donkey head 5, and the bottom wall of the left rope groove is in an arc shape opening to the right. A second fixed pulley 33 is rotatably installed on the inner side of the upper portion of the left rope groove, and a third fixed pulley 34 and a fourth fixed pulley 35 are rotatably installed on the upper side of the balancing donkey head 5 corresponding to the position above the second fixed pulley 33 at a front and rear interval. A hanging frame 38 is hingedly installed on the upper side of the counterweight box 7, and a first movable pulley 36 and a second movable pulley 37 are rotatably installed in the hanging frame 38 at a front and rear interval. The first end of the first traction rope 3 passes around the outer side of the lower part of the first movable pulley 36 and the outer side of the upper part of the third fixed pulley 34 in sequence, and is fixedly connected to the outer side of the front of the rope winding drum 12. The second end of the first traction rope 3 passes around the outer side of the upper part of the second fixed pulley 33, the outer side of the lower part of the second movable pulley 37 and the outer side of the upper part of the fourth fixed pulley 35 in sequence, and is fixedly connected to the outer side of the rear of the rope winding drum 12.

[0048] During use, the second driving mechanism drives the rope drum 12 to rotate. When the rope drum 12 rotates, the lifting frame 38 is moved up and down through the first traction rope 3, thereby realizing the rising and falling of the counterweight box 7. In this way, when repairing the oil pump, the counterweight box 7 at any height can be lowered to the ground for automatic unloading. After the maintenance is completed, the counterweight box 7 on the ground can also be lifted to a set height, thereby reducing the labor intensity of the staff. The balancing donkey head 5 and the walking beam 8 can also be installed, and then the counterweight box 7 on the ground can be lifted to a set height through the second driving mechanism, thereby avoiding the work intensity of the staff to lift the counterweight box 7. When it is necessary to adjust the working stroke of the oil pump, the height position of the rope hanger 16 can also be adjusted through the second driving mechanism as needed.

[0049] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 , 3As shown in Figures 10 and 11, the second driving mechanism includes a mounting seat 39 and an unloading motor 40. The mounting seat 39 is fixedly mounted on the right side of the upper part of the balancing donkey head 5, and the unloading motor 40 is fixedly mounted on the upper left side of the mounting seat 39. A rotating shaft 41 is rotatably mounted on the upper right side of the mounting seat 39. The rear end of the rotating shaft 41 is drivingly connected with the rear end of the output shaft of the unloading motor 40. The rope drum 12 is fixedly mounted on the outer side of the rotating shaft 41. A third mounting hole and a fourth mounting hole that are through-through are provided at intervals from top to bottom on the right front side of the balancing donkey head 5 corresponding to the position of the left mounting groove 11. A second hinge pin 43 is rotatably mounted in the middle part with the upper left side of the walking beam 8. A connecting pin 44 of a hollow structure is passed through the mounting hole and is rotatably mounted together with the lower left side of the walking beam 8 in the middle. A connecting thread is provided on the inner front side of the connecting pin 44. A guide groove 45 opening outward is axially provided on the outer side of the connecting pin 44. A mounting sleeve 46 is fixedly installed on the front side of the right part of the balancing donkey head 5 corresponding to the position of the fourth mounting hole. A screw rod 48 is sleeved inside the mounting sleeve 46 and the rear outer side is screwed to the inner front side of the connecting pin 44. A slider 47 slidably mounted in the guide groove 45 is fixedly installed on the inner rear side of the mounting sleeve 46. A disassembly motor 49 is fixedly installed on the lower front side of the mounting sleeve 46. The upper end of the output shaft of the disassembly motor 49 is drivingly connected to the front end of the screw rod 48.

[0050] According to requirements, the unloading motor 40 and the disassembly and assembly motor 49 are both existing well-known worm gear reduction motors. In order to improve safety, an electromagnetic brake can be arranged on the outside of the rotating shaft 41 in front of the rope drum 12. The rotating shaft 41 can be fixed by the electromagnetic brake when not working. A driven bevel gear 20 is fixedly installed on the front outside of the screw rod 48, and an active bevel gear 20 is fixedly installed on the upper end of the output shaft of the disassembly and assembly motor 49. The active bevel gear 20 and the driven bevel gear 20 are meshed with each other, thereby realizing a transmission connection between the upper end of the output shaft of the disassembly and assembly motor 49 and the front end of the screw rod 48. The inner side of the lower part of the mounting sleeve 46 and the outer side of the lower part of the connecting pin 44 are provided with guide grooves 45 with openings opposite to each other. The lower part of the slider 47 is fixedly installed in the guide groove 45 of the mounting sleeve 46, and the upper part of the slider 47 is slidably installed in the guide groove 45 of the connecting pin 44.

[0051] During use, the unloading motor 40 drives the rope drum 12 to rotate, thereby realizing the rising and falling of the lifting frame 38. In this way, when the walking beam 8 is undergoing maintenance work at any position, the counterweight box 7 can be safely lowered to the upper side of the buffer platform through the unloading motor 40 to realize the unloading of the counterweight box 7. The counterweight box 7 placed on the ground can also be quickly lifted to any height, making the disassembly and assembly of the counterweight box 7 more labor-saving and safer, thereby improving maintenance efficiency.

[0052] After the disassembly and assembly motor 49 works, the outer rear part of the screw rod 48 rotates in the connecting screw hole, and the connecting pin 44 moves forward or backward under the constraint of the slider 47, so as to facilitate the separation of the connecting pin 44 from the rocker 8 or the rotation and installation of the connecting pin 44 and the rocker 8 together. When the connecting pin 44 is separated from the left part of the rocker 8, the balancing donkey head 5 can rotate relatively under the action of the rocker 8 and the second hinge pin 43, so as to achieve the effect of giving way to the balancing donkey head 5. During minor repairs, the disassembly and assembly motor 49 is used to make the balancing donkey head 5 and the left part of the rocker 8 rotate relatively or be fixed together, thereby avoiding the need for operators to climb up to work, thereby reducing safety risks, reducing the labor intensity of personnel, and shortening maintenance time.

[0053] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in , 3, and 12, a lifting beam 50 is rotatably installed on the inner side of the lower part of the lifting frame 38 corresponding to the position below the first movable pulley 36, and a connecting hole is provided in the middle of the lifting beam 50, which passes through from top to bottom, and a hanging rod 51 is passed through the connecting hole, and a locking nut 52 is fixedly installed on the outer side of the hanging rod 51 corresponding to the upper side of the lifting beam 50, and a bearing 53 is installed on the outer side of the hanging rod 51 between the lower end of the locking nut 52 and the upper end of the lifting beam 50, and a connecting pipe 54 is screwed on the outer side of the lower end of the hanging rod 51, and a connecting seat 55 is fixedly installed at the center of the upper side of the counterweight box 7, and the connecting seat 55 is hingedly installed with the lower part of the connecting pipe 54.

[0054] According to requirements, the cross-section of the middle part of the lifting beam 50 can be rectangular, and the cross-sections of the front and rear ends of the lifting beam 50 are both circular. The outer sides of the front and rear ends of the lifting beam 50 are both provided with annular grooves, and the grooves are installed with existing well-known retaining springs, which can prevent the lifting beam 50 from separating from the lifting frame 38 after moving forward and backward. The bearing 53 is an existing well-known thrust bearing. In this embodiment, the bearing 53 is installed on the inner side of the lower part of the locking nut 52, and the lower part of the connecting pipe 54 is hingedly installed with the connecting seat 55 through existing well-known pins.

[0055] During use, by setting a locking nut 52, the disassembly and assembly between the suspension rod 51 and the lifting beam 50 is facilitated. The suspension rod 51 is inserted into the connecting hole. In this way, when the counterweight box 7 is in use, if there is strong wind, the counterweight box 7 can rotate relative to the lifting beam 50 to avoid driving the lifting frame 38 to rotate, causing the first traction rope 3 to get entangled and eventually get out of the rope groove to cause a malfunction, thereby improving stability.

[0056] The upper end of the connecting tube 54 is screwed together with the lower end of the hanging rod 51. In this way, after the counterweight box 7 is in place, the lower end of the connecting tube 54 is hingedly installed with the connecting seat 55 on the upper side of the counterweight box 7, and then the upper end of the connecting tube 54 is screwed together with the lower end of the hanging rod 51. This can avoid the problem of difficulty in installing the counterweight box 7 with the hanging rod 51 after the position of the counterweight box 7 is not correct, and can reduce the difficulty of installing the counterweight box 7, making the installation of the counterweight box 7 more labor-saving. In windy weather, it is easier for the counterweight box 7 to rotate relative to the lifting beam 50, avoiding entanglement of the first traction rope 3.

[0057] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in Figures 3 and 13, the first driving mechanism includes a reducer 56 and a driving motor 57 fixedly installed on the upper side of the base 1 at left and right intervals. The front end of the output shaft of the driving motor 57 is connected to the front part of the input shaft on the right side of the reducer 56 by driving. A crank 9 is fixedly installed on the outer side of the end of the output shaft of the reducer 56.

[0058] According to the requirements, the reducer 56 is an existing well-known technology, such as a two-stage cylindrical gear reducer. The rear end of the input shaft of the right part of the reducer 56 is located behind the housing of the reducer 56. A brake mechanism that cooperates with the input shaft of the reducer 56 is provided on the base 1. The brake mechanism is an existing well-known technology, such as a drum brake or a disc brake. A tail shaft 58 is rotatably installed on the lower left side of the walking beam 8 corresponding to the position between the balancing donkey head 5 and the frame 2. A crossbeam is hingedly installed on the outer side of the tail shaft 58. Pins 59 are fixedly installed on the front and rear parts of the crossbeam. Cranks 9 are fixedly installed on the outer sides of the rear end and the front end of the output shaft of the reducer 56. Connecting rods 10 are fixedly installed on the outer sides of the left part of the cranks 9. A crossbeam 59 is fixedly installed on the top of the connecting rod 10. The upper side of the horizontal plate has two connecting plates 61 fixedly installed at intervals on the left and right sides, each connecting plate 61 has a disassembly hole that passes through it from left to right on the left side, each connecting plate 61 has a notch on the upper side that is connected to the disassembly hole on the lower side, and the front side of the connecting plate 61 corresponding to the notch is provided with a disassembly screw hole that passes through it from front to back, and each disassembly screw hole is threaded with a disassembly screw, and the left outer side and the right outer side of the pin shaft 59 are rotatably installed in the disassembly hole at the corresponding position, a reinforcing tube 60 is fixedly installed on the lower side of the horizontal plate, and the upper end of the connecting rod 10 is fixedly installed in the reinforcing tube 60 at the corresponding position, so that the current casting process of the component can be improved to a disassembly process, thereby reducing energy consumption, reducing pollution emissions, and improving production efficiency.

[0059] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figures 1 to 3, 14 to 16, the first driving mechanism also includes a control module, a right rope groove 42 with an opening facing outward is provided on the right outer side of the working donkey head 6, the bottom wall of the right rope groove 42 is in an arc shape with an opening facing right, a first pulley frame is provided on the inner side of the upper part of the right rope groove 42, the first pulley frame includes a first positioning seat 64, a first hanging plate 66, a first load sensor 62 and a first anti-slip pin 68, a first positioning seat 64 is fixedly installed on the inner side of the upper part of the right rope groove 42, a first hanging plate 66 is hingedly installed on the right part of the first positioning seat 64, the first hanging plate 66 is in a U-shape with an opening facing downward, a first load sensor 62 is fixedly installed on the inner side of the upper part of the first hanging plate 66, a first fixed pulley 17 is rotatably installed on the outer side of the middle part of the first load sensor 62, and a first anti-slip pin 68 is fixedly installed on the lower part of the first hanging plate 66 corresponding to the position below the first load sensor 62; A second pulley frame is provided in the left rope groove corresponding to the lower left position of the third fixed pulley 34, and the second pulley frame includes a second positioning seat 65, a second hanging plate 67, a second load sensor 63 and a second anti-slip pin 69. The second positioning seat 65 is fixedly installed on the inner side of the upper part of the left rope groove, and the second hanging plate 67 is hingedly installed on the left part of the second positioning seat 65. The second hanging plate 67 is in a U-shape with an opening downward, and the second load sensor 63 is fixedly installed on the inner side of the upper part of the second hanging plate 67. The second fixed pulley 33 is rotatably installed on the outer side of the middle part of the second load sensor 63, and the second anti-slip pin 69 is fixedly installed on the lower part of the second hanging plate 67 corresponding to the position below the second load sensor 63. The first load sensor 62 and the second load sensor 63 are both connected to the control module, and the control module is respectively connected to the drive motor 57, the yield motor 19, the unloading motor 40 and the disassembly motor 49.

[0060] According to the requirements, the first load sensor 62 and the second load sensor 63 are both existing well-known axle pin sensors, such as the JUL-P01 pin force sensor, and the control module is an existing well-known technology, such as a pumping unit controller or a programmable controller. The control module can be fixedly installed in a control cabinet, and the control cabinet is fixedly installed on the upper right side of the base 1.

[0061] When minor repairs and maintenance are required at the wellhead, the control module is used to make the drive motor 57 stop the light rod at 200 to 300 mm close to the lower dead point, and the brake mechanism is used to brake the output shaft of the reducer 56. The control module is used to make the unloading motor 40 work, and the rope drum 12 rotates to release the first traction rope 3. The counterweight box 7 slowly descends and falls on the upper side of the buffer platform. Then the staff removes the pin between the connecting pipe 54 and the connecting seat 55 on the ground, and then uses the control module to make the rope drum 12 rotate in the opposite direction to lift the lifting frame 38 to the bottom of the balancing donkey head 5. In this way, the staff can complete the unloading operation of the balancing donkey head 5 on the ground, which can reduce the labor intensity of the staff.

[0062] Then install the slips for fixing the polished rod above the wellhead Christmas tree, and then stop the working donkey head 6 at the lower dead center position through the control module, disassemble the rope hanger 16 from the polished rod, and complete the separation of the pumping unit and the polished rod after the polished rod and the rope hanger 16 are separated.

[0063] The control module is used to make the yielding motor 19 work. After the yielding motor 19 works, the yielding pin 15 moves forward and separates from the right part of the rocker 8. At this time, the working donkey head 6 and the rocker 8 are hingedly connected by the first hinge pin 14, and the right end of the tightening bolt 32 is against the upper left side of the working donkey head 6, so that the lower part of the working donkey head 6 will not swing toward the wellhead under the action of gravity. At this time, the brake mechanism is released, and the drive motor 57 is made to work through the control module. When the working donkey head 6 runs to the upper dead center position, the drive motor 57 stops running. The working donkey head 6 and the rocker 8 are only hingedly connected by the first hinge pin 14. At this time, the working donkey head 6 can be pulled by the second traction rope 4. After the working donkey head 6 swings under the action of gravity and the second traction rope 4 and moves away from the wellhead oil production tree, a yielding space is formed between the working donkey head 6 and the wellhead oil production tree. Finally, the drive motor 57 is powered off and stopped, and then the output shaft of the reducer 56 is braked by the brake mechanism to complete the unloading and yielding work and carry out well repair operations.

[0064] The first load sensor 62 can monitor the downhole load transmitted by the second traction rope 4 in real time through the first fixed pulley 17. When the downhole load is greater than the set threshold, the control module can stop the drive motor 57 from running, so as to achieve the purpose of wax formation warning, overload and unload intelligent control. The control module can be connected to the control center, so that the control module can send information to the control center. After the control center receives the information, the monitoring personnel will notify the staff to perform maintenance work in time. The second load sensor 63 can monitor the load of the counterweight box 7 on the first traction rope 3 in real time through the second fixed pulley 33. In this way, in the process of installing the counterweight block into the counterweight box 7, the load data transmitted to the control module by the second axle pin sensor can be observed, making the installation of the counterweight block more convenient.

[0065] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and optimal implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A double-head automatic-giving-way inspection and maintenance oil pumping unit, characterized in that The machine comprises a base, a frame, a first driving mechanism, a first traction rope, a second traction rope, a balancing donkey head, a working donkey head and a counterweight box. The frame and the first driving mechanism are fixedly installed at intervals on the upper side of the base. A walking beam is hingedly installed on the upper side of the frame. A crank is fixedly installed on the outer side of the output shaft end of the first driving mechanism. A connecting rod is hingedly connected between the right part of the crank and the lower side of the left part of the walking beam. A left mounting groove opening to the right is provided on the upper right side of the balancing donkey head. The outer side of the left part of the walking beam can be detachably fixedly installed in the left mounting groove. A rope drum and a second driving mechanism capable of driving the rope drum to rotate are provided on the upper right side of the balancing donkey head corresponding to the position above the walking beam. A counterweight box is provided under the balancing donkey head. The first traction rope is fixedly connected between the upper side of the counterweight box and the rope drum. A right mounting groove opening to the left is provided on the left side of the upper part of the working donkey head, and a first mounting hole and a second mounting hole which pass through the front and rear are provided at intervals from top to bottom on the right front side of the working donkey head corresponding to the position of the right mounting groove, a first hinge pin which is rotatably mounted on the upper side of the right end of the walking beam is passed through the first mounting hole, a yield pin which is rotatably mounted on the lower side of the right end of the walking beam is passed through the second mounting hole, a third driving mechanism which can move the yield pin forward and backward is provided on the front side of the lower part of the working donkey head, a rope suspension device is provided under the working donkey head, a first fixed pulley is rotatably mounted on the outer side of the upper part of the working donkey head, a first end of the second traction rope is fixedly connected to the front of the rope suspension device, and the second end of the second traction rope is fixedly connected to the rear of the rope suspension device after passing around the outer side of the upper part of the first fixed pulley.

2. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 1 is characterized in that The third driving mechanism includes a fixed seat, a yielding motor and a gear. A fixed seat is fixedly installed on the front side of the upper part of the working donkey head. The front part of the yielding pin is slidably installed in the fixed seat along the front-to-back direction. A plurality of tooth grooves opening downward are provided at intervals along the axial front-to-back direction on the outer side of the lower part of the yielding pin. A driving shaft is rotatably installed in the fixed seat corresponding to the position below the yielding pin. A gear meshing with the tooth groove is fixedly installed on the outer side of the driving shaft. A yielding motor is fixedly installed on the front side of the working donkey head corresponding to the right side of the fixed seat. The left end of the output shaft of the yielding motor is transmission-connected to the right end of the driving shaft.

3. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 2 is characterized in that Wear-resistant sleeves are fixedly installed on the inner side of the front end and the inner side of the rear end of the second mounting hole. Each wear-resistant sleeve is sleeved on the outer side of the yield pin. A lubrication ring groove is provided on the inner side of the wear-resistant sleeve. A plurality of radially penetrating lubrication holes are distributed at intervals along the circumferential direction on the outer side of the upper part of the wear-resistant sleeve corresponding to the position of the lubrication ring groove. Graphite columns and top screws are arranged in sequence from the inside to the outside of the lubrication hole. A compression spring is provided between the graphite column and the inner side of the lubrication hole. The compression spring makes the end of the graphite column abut against the outer side of the yield pin. Or / and, a fixing plate is fixedly installed on the upper side of the right part of the walking beam corresponding to the left position of the first hinge pin, and a fixing screw hole penetrating left and right is provided on the upper part of the fixing plate, and a tightening bolt is screwed in the fixing screw hole.

4. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 1, 2 or 3, characterized in that A left rope groove opening outward is provided on the outer side of the left portion of the balancing donkey head, and the bottom wall of the left rope groove is in an arc shape opening to the right, and a second fixed pulley is rotatably installed on the inner side of the upper portion of the left rope groove, and a third fixed pulley and a fourth fixed pulley are rotatably installed on the upper side of the balancing donkey head corresponding to the position above the second fixed pulley, and a lifting frame is hingedly installed on the upper side of the counterweight box, and a first movable pulley and a second movable pulley are rotatably installed in the lifting frame at intervals front and back, and a first end of the first traction rope is fixedly connected to the outer side of the front of the rope winding drum after passing through the outer side of the lower portion of the first movable pulley and the outer side of the upper portion of the third fixed pulley in sequence, and a second end of the first traction rope is fixedly connected to the outer side of the rear of the rope winding drum after passing through the outer side of the upper portion of the second fixed pulley, the outer side of the lower portion of the second movable pulley and the outer side of the upper portion of the fourth fixed pulley in sequence.

5. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 4 is characterized in that The second driving mechanism includes a mounting seat and an unloading motor. The mounting seat is fixedly installed on the right side of the upper part of the balancing donkey head, and the unloading motor is fixedly installed on the upper left side of the mounting seat. A rotating shaft is rotatably installed on the upper right side of the mounting seat. The rear end of the rotating shaft is connected to the rear end of the output shaft of the unloading motor by transmission. The rope drum is fixedly installed on the outer side of the rotating shaft. A third mounting hole and a fourth mounting hole that pass through the front and rear sides of the right front side of the balancing donkey head corresponding to the position of the left mounting groove are provided at intervals up and down. A second hinge pin that is rotatably installed with the middle part and the upper left side of the walking beam is passed through the third mounting hole. A connecting pin of a hollow structure is penetrated and rotatably mounted together with the lower left side of the walking beam, a connecting thread is arranged on the inner side of the front part of the connecting pin, and a guide groove opening outward is arranged on the outer side of the connecting pin along the axial direction, and a mounting sleeve is fixedly installed on the front side of the right part of the balancing donkey head corresponding to the position of the fourth mounting hole, and a screw rod whose rear outer side is screwed to the inner side of the front part of the connecting pin is arranged inside the mounting sleeve, a slider slidably mounted in the guide groove is fixedly installed on the inner side of the rear part of the mounting sleeve, and a disassembly motor is fixedly installed on the lower side of the front part of the mounting sleeve, and the upper end of the output shaft of the disassembly motor is drivingly connected with the front end of the screw rod; Or / and, a lifting beam is rotatably installed on the inner side of the lower part of the lifting frame corresponding to the position below the first movable pulley, a connecting hole is provided in the middle of the lifting beam which passes through from top to bottom, a hanging rod is passed through the connecting hole, a locking nut is fixedly installed on the outer side of the hanging rod corresponding to the upper side of the lifting beam, a bearing is installed on the outer side of the hanging rod between the lower end of the locking nut and the upper end of the lifting beam, a connecting pipe is threaded on the outer side of the lower end of the hanging rod, and a connecting seat is fixedly installed on the center of the upper side of the counterweight box, and the connecting seat is hingedly installed with the lower part of the connecting pipe.

6. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 1, 2, 3 or 5, characterized in that The first driving mechanism includes a reducer and a driving motor fixedly installed on the upper side of the base at left and right intervals. The front end of the output shaft of the driving motor is drivingly connected to the front part of the input shaft on the right side of the reducer, and a crank is fixedly installed on the outer side of the output shaft end of the reducer.

7. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 4 is characterized in that The first driving mechanism includes a reducer and a driving motor fixedly installed on the upper side of the base at left and right intervals. The front end of the output shaft of the driving motor is drivingly connected to the front part of the input shaft on the right side of the reducer, and a crank is fixedly installed on the outer side of the output shaft end of the reducer.

8. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 6 is characterized in that The first driving mechanism also includes a control module, a right rope groove opening outward is provided on the outer side of the right part of the working donkey head, the bottom wall of the right rope groove is in an arc shape opening to the right, a first pulley frame is provided on the inner side of the upper part of the right rope groove, the first pulley frame includes a first positioning seat, a first hanging plate, a first load sensor and a first anti-slip pin, a first positioning seat is fixedly installed on the inner side of the upper part of the right rope groove, a first hanging plate is hingedly installed on the right part of the first positioning seat, the first hanging plate is in a U shape opening downward, a first load sensor is fixedly installed on the inner side of the upper part of the first hanging plate, a first fixed pulley is rotatably installed on the outer side of the middle part of the first load sensor, and a first anti-slip pin is fixedly installed on the lower part of the first hanging plate corresponding to the position below the first load sensor; A second pulley frame is provided in the left rope groove corresponding to the lower left position of the third fixed pulley, the second pulley frame includes a second positioning seat, a second hanging plate, a second load sensor and a second anti-slip pin, a second positioning seat is fixedly installed on the inner side of the upper part of the left rope groove, a second hanging plate is hingedly installed on the left part of the second positioning seat, the second hanging plate is in a U-shape with an opening downward, a second load sensor is fixedly installed on the inner side of the upper part of the second hanging plate, the second fixed pulley is rotatably installed on the outer side of the middle part of the second load sensor, a second anti-slip pin is fixedly installed on the lower part of the second hanging plate corresponding to the position below the second load sensor, the first load sensor and the second load sensor are both connected to the control module, and the control module is respectively connected to the driving motor, the yielding motor, the unloading motor and the disassembly motor.

9. The double-head automatic-giving-way inspection and maintenance oil pumping unit according to claim 7 is characterized in that The first driving mechanism also includes a control module, a right rope groove opening outward is provided on the outer side of the right part of the working donkey head, the bottom wall of the right rope groove is in an arc shape opening to the right, a first pulley frame is provided on the inner side of the upper part of the right rope groove, the first pulley frame includes a first positioning seat, a first hanging plate, a first load sensor and a first anti-slip pin, a first positioning seat is fixedly installed on the inner side of the upper part of the right rope groove, a first hanging plate is hingedly installed on the right part of the first positioning seat, the first hanging plate is in a U shape opening downward, a first load sensor is fixedly installed on the inner side of the upper part of the first hanging plate, a first fixed pulley is rotatably installed on the outer side of the middle part of the first load sensor, and a first anti-slip pin is fixedly installed on the lower part of the first hanging plate corresponding to the position below the first load sensor; A second pulley frame is provided in the left rope groove corresponding to the lower left position of the third fixed pulley, the second pulley frame includes a second positioning seat, a second hanging plate, a second load sensor and a second anti-slip pin, a second positioning seat is fixedly installed on the inner side of the upper part of the left rope groove, a second hanging plate is hingedly installed on the left part of the second positioning seat, the second hanging plate is in a U-shape with an opening downward, a second load sensor is fixedly installed on the inner side of the upper part of the second hanging plate, the second fixed pulley is rotatably installed on the outer side of the middle part of the second load sensor, a second anti-slip pin is fixedly installed on the lower part of the second hanging plate corresponding to the position below the second load sensor, the first load sensor and the second load sensor are both connected to the control module, and the control module is respectively connected to the driving motor, the yielding motor, the unloading motor and the disassembly motor.

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