Integrated sensing protection device and automatic balance-adjusting beam-pumping unit

Abstract

The invention relates to the technical field of pumping units, in particular to an integrated sensing protection device and an automatic balance-adjusting beam-pumping unit, the integrated sensing protection device comprises a cross arm, a first load sensor and a second load sensor, and the front side of the cross arm is provided with a vertically through front mounting groove with a forward opening. The device is reasonable and compact in structure, the first load sensor and the second load sensor can be integrated through the first test hole and the second test hole, the cross arm can be conveniently connected with the polished rod through a steel wire rope through the front mounting groove and the rear mounting groove, the cross arm can be mounted on the horse head through the connecting hole, and the cross arm is convenient to mount and dismount. In this way, the load borne by the polish rod in the up-down movement process can act on the crosspiece through the steel wire rope, and the load can be transmitted to the first load sensor and the second load sensor after the cross arm and the horse head interact with each other. In this way, the first load sensor and the second load sensor can collect load data borne by the polish rod in the up-down movement process in real time.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, in particular to an integrated sensing protection device and an automatically balancing walking beam type oil pumping unit. Background Art

[0002] The oil pumping unit is the most widely used oil production equipment in oil extraction. In order to understand the working status of the oil pumping unit system, it is necessary to measure the load on the oil pumping unit's polished rod at all times. In the existing technology, a load sensor is used to measure the load on the polished rod at all times. The load sensor is set between the rope hanger and the polished rod slip on the polished rod.

[0003] Chinese patent document CN112012718A discloses a load sensor protection device, which includes a base, an upper plate disposed above the base, the upper plate and the base being parallel and spaced apart, a mounting cavity for mounting a load sensor disposed between the upper plate and the base, a mounting position for mounting the load sensor disposed on the base, a stabilizing hole disposed on the mounting position, and damping buffer assemblies disposed on either side of the mounting position on the base for buffering the impact force on the upper plate. During use of the load sensor, the return spring of the damping buffer assembly also acts on the upper plate after the upper plate moves downward, which causes the load received by the upper plate to be less than the actual load, resulting in deviations in the data collected by the load sensor and inability to collect accurate data. Furthermore, the device is difficult to disassemble and assemble with the polished rod. Since the piston rod is provided with a buffer return spring, this also requires the installation accuracy of the base and the upper plate to prevent the buffer return springs on both sides from being subjected to different forces, which further increases the installation difficulty.

[0004] Chinese patent publication CN216446905U discloses a load sensor loading device comprising a rope hanger, a fixed plate, a limit clamp, and a wire rope. The limit clamp is located above the fixed plate and is attached to the pumping rod. The wire rope and the fixed plate limit each other, and the wire rope pulls the fixed plate upward. The load sensor loading device also includes two lifters and a lifting clamp. The lifters are detachably mounted on either side of the upper end surface of the rope hanger. The upper end surfaces of the lifters support a load-bearing crossbeam. The lifting clamps are placed on the load-bearing crossbeam and are attached to the pumping rod. This load sensor loading device is complex to install and remove the wire rope during use, resulting in high maintenance costs and making it impossible to collect load data from the pumping unit.

[0005] Pumping unit data collection (dynamometer data collection) is typically located on the polished rod and the upper portion of the suspension rope, transmitting data via wired or wireless communication. The wired dynamometer installed here moves up and down with the polished rod during operation. At a frequency of five times per minute, the cable reciprocates 7,200 times a day, or 2,628,000 times a year. This constant movement throughout the four seasons can easily fatigue and deform the load sensor, leading to biased and inaccurate data and significantly reducing the cable's service life.

[0006] Chinese patent publication CN221120251U discloses a tower-type pumping unit liquid balancing and weight adjustment device, comprising: a counterweight box mounted on the tower pumping unit; a liquid storage tank connected to the counterweight box; and a liquid storage tank connected to the liquid storage tank via a hose; wherein the hose is provided with a pump. In this tower-type pumping unit liquid balancing and weight adjustment device, the hose is connected to the liquid storage tank. As the hose moves up and down with the counterweight box, it frequently bends, which can easily cause cracking in the hose and its connections. Furthermore, in order for the hose to bend and deform as the counterweight box moves up and down, it needs to be positioned naturally, which can easily be pulled in strong winds, increasing the load on one side of the counterweight box and reducing the balance of the pumping unit.

[0007] Chinese patent document CN206694232U discloses a dynamic balancing device for a pumping unit, which includes a first liquid storage tank, a second liquid storage tank, a liquid guide pipe, an air guide pipe, and an electrically controlled valve; the first liquid storage tank is fixed near the tail of the pumping unit's walking beam, and the second liquid storage tank is fixed near the upper end of the pumping unit's walking beam, and the first liquid storage tank and the second liquid storage tank have the same volume; the first liquid storage tank and the second liquid storage tank are connected at the bottom by a liquid guide pipe, and at the top by an air guide pipe; the electrically controlled valve is installed on the liquid guide pipe, and when the balance of the pumping unit needs to be adjusted, it is achieved by controlling the opening or closing of the electrically controlled valve. In the dynamic balancing device of the oil pumping unit, the liquid storage tank is set on the upper side of the walking beam, which causes the center of gravity of the oil pumping unit to rise, making the stability of the oil pumping unit reduced. Especially when operating in a windy environment, the wind resistance of the oil pumping unit is large, and accidents are prone to occur. Secondly, since the walking beam generally swings within the range of ±35 degrees, it is necessary to reserve a large enough space in the first liquid storage tank and the second liquid storage tank to prevent the liquid from flowing into the air duct when the two ends of the walking beam swing to the maximum value, resulting in poor fluidity of the automatic liquid. Moreover, during the swinging of the walking beam, the liquids in the first liquid storage tank and the second liquid storage tank flow with each other. However, the balancing load of the oil pumping unit is generally greater than 2 tons, and the liquids in the first liquid storage tank and the second liquid storage tank need to have a large flow rate. It is difficult to meet the balance adjustment of the oil pumping unit by relying solely on gravity.

[0008] Currently, balancing a pumping unit requires measuring the balance value, shutting down the unit, manually adjusting the balancing mechanism, restarting the unit for measurement, and then recalibrating the unit. This sometimes requires repeated adjustments to meet the required balance, but typically only achieves an 80% balance. Commonly used balancing methods are time-consuming and labor-intensive, requiring frequent machine starts and stops, consuming significant energy, and achieving limited results. Furthermore, the balancing process requires handling counterweights, which is labor-intensive and prone to safety accidents. Summary of the Invention

[0009] The present invention provides an integrated sensing protection device and an automatically balancing walking beam pumping unit, which overcome the deficiencies of the above-mentioned prior art. Firstly, it solves the problems of inaccurate data collection and difficult installation of the existing load sensing device. Secondly, it solves the problems of high shutdown frequency, low production efficiency and high labor intensity when the pumping unit automatically adjusts its balance rate during operation.

[0010] One of the technical solutions of the present invention is achieved through the following measures: an integrated sensing protection device, including a crossarm, a first load sensor and a second load sensor, a front mounting groove that runs through from top to bottom and opens forward is provided on the front side of the crossarm, a rear mounting groove that has the same structure as the front mounting groove and is symmetrically distributed on the rear side of the crossarm, a first test hole and a second test hole are provided at intervals in front and back on the upper side of the crossarm corresponding to the position between the front mounting groove and the rear mounting groove, a connecting hole that runs through from top to bottom is provided in the center of the upper side of the crossarm corresponding to the position between the first test hole and the second test hole, and a first load sensor and a second load sensor are installed in the first test hole and the second test hole, respectively.

[0011] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned front mounting groove may include a notch and a recessed groove. The front side of the cross arm is provided with a U-shaped notch that passes through from top to bottom and opens forward. The lower side of the front of the cross arm is provided with a recessed groove that opens downward. The upper part of the recessed groove is connected to the lower part of the notch.

[0012] The cross section of the above-mentioned groove may be in the shape of an arc, and the diameter of the groove is greater than the width of the notch.

[0013] The left side of the front of the cross arm can be provided with a front limiting hole whose right end extends to the right side of the cross arm, and the front limiting hole is connected to the front of the notch, and the left side of the rear of the cross arm is provided with a rear limiting hole with the same structure as the front limiting hole.

[0014] The left side of the above-mentioned crossarm may be provided with a fixing hole opening to the left, and the inner wall of the right part of the fixing hole is provided with a first wire threading hole connected to the first test hole and a second wire threading hole connected to the second test hole on the right side. A protective joint is fixedly installed in the fixing hole, and a first connecting cable with a first end connected to the first load sensor is provided in the first wire threading hole. A second connecting cable with a first end connected to the second load sensor is provided in the second wire threading hole. The second end of the second connecting cable and the second end of the first connecting cable are respectively connected to the corresponding positions of the protective joint.

[0015] A first positioning hole may be provided on the lower side of the front portion of the cross arm, the upper end of which is connected to the lower portion of the first test hole, and a first positioning screw may be fixedly installed in the first positioning hole, the upper end of which is detachably fixed to the lower portion of the first load sensor. A second positioning hole may be provided on the lower side of the rear portion of the cross arm, the upper end of which is connected to the lower portion of the second test hole, and a second positioning screw may be fixedly installed in the second positioning hole, the upper end of which is detachably fixed to the lower portion of the second load sensor.

[0016] The second technical solution of the present invention is achieved through the following measures: an automatically balancing walking beam pumping unit, including an integrated sensor protection device, a frame, an articulated shaft, a walking beam, a left donkey head, a right donkey head, a reducer, a counterweight box, a drive motor and a controller. The upper side of the frame and the lower side of the middle part of the walking beam are hinged together by an articulated shaft. The left end of the walking beam is detachably fixedly installed with a left donkey head. A counterweight wire rope is fixedly connected between the left part of the left donkey head and the upper side of the counterweight box located below the left donkey head. The output shaft of the drive motor is transmission-connected with the input shaft of the reducer. A crank is fixedly installed on the outside of the output shaft of the reducer. A connecting rod is hingedly installed between the crank and the lower side of the right part of the walking beam. The right end of the walking beam is detachably fixedly installed with a right donkey head. There is a counterweight wire rope on the left side of the upper part of the right donkey head corresponding to the position above the walking beam. A fixing groove is fixedly installed in the fixing groove, a front guide wheel and a rear guide wheel are installed on the upper left side of the right donkey head in a front and rear interval rotation manner, an integrated sensing protection device is arranged on the lower side of the fixing seat, and a connecting rod with the upper end installed together with the fixing seat is set in the connecting hole of the integrated sensing protection device, a front oil pumping wire rope with a first end fixedly installed in the front mounting groove is provided around the upper outer side of the front guide wheel, the second end of the front oil pumping wire rope passes around the right outer side of the right donkey head and is located below the right donkey head, a rear oil pumping wire rope with a first end fixedly installed in the rear mounting groove is provided around the upper outer side of the rear guide wheel, the second end of the rear oil pumping wire rope passes around the right outer side of the right donkey head and is located below the right donkey head, the first load sensor and the second load sensor are both connected to the controller, and the controller is connected to the drive motor.

[0017] A liquid storage tank can be installed at the lower part of the left donkey head. A delivery pump and a liquid storage tank are provided under the left donkey head. The delivery pump can deliver the liquid filled in the liquid storage tank into the liquid storage tank to increase the weight of the left donkey head, and the delivery pump can deliver the liquid in the liquid storage tank into the liquid storage tank to reduce the weight of the left donkey head.

[0018] The outside of the above-mentioned liquid storage tank may be provided with a liquid inlet hole and a liquid outlet hole that are connected inside and outside. A first rotary joint is installed in front of the hinge shaft. The front part of the first rotary joint is separated by a first liquid inlet and a second liquid inlet. The rear part of the first rotary joint is separated by a first liquid outlet and a second liquid outlet. The first liquid outlet is connected to the first liquid inlet, and the second liquid outlet is connected to the second liquid inlet. A liquid inlet pipeline is fixedly connected between the first liquid outlet and the liquid inlet, and a liquid outlet pipeline is fixedly connected between the second liquid outlet and the liquid outlet. The delivery pump includes a first pump and a second pump. The outlet of the liquid storage tank is fixedly connected to the inlet of the first pump, and a liquid adding pipeline is fixedly connected between the outlet of the first pump and the first liquid inlet. The inlet of the liquid storage tank is fixedly connected to the outlet of the second pump, and a liquid return pipeline is fixedly connected between the inlet of the second pump and the second liquid inlet.

[0019] A third load sensor for collecting load data of the left donkey head may be provided between the left end of the walking beam and the left donkey head. The third load sensor is connected to the controller, and the controller is connected to the first pump and the second pump respectively.

[0020] The present invention has a reasonable and compact structure. By setting the first test hole and the second test hole, the first load sensor and the second load sensor can be integrated together. The setting of the front mounting groove and the rear mounting groove makes it easy to connect the cross arm and the light rod through the wire rope. The setting of the connecting hole can install the cross arm on the donkey head, so that the load received by the light rod during the up and down movement can act on the cross bar through the wire rope. After the cross arm interacts with the donkey head, the load can be transferred to the first load sensor and the second load sensor. In this way, the first load sensor and the second load sensor can collect the load data received by the light rod during the up and down movement in real time, and calculate the average value of the data collected by the first load sensor and the second load sensor, so that the collected load data can be more accurate. Concentrating the first load sensor and the second load sensor on the cross arm can also reduce the difficulty of installation. The integrated sensing protection device in this application is installed on the donkey head of the oil pump, which can avoid the cable from breaking due to repeated bending during the up and down swinging of the donkey head, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attachment Figure 1 Schematic diagrams of the main structures of embodiments one to six of the present invention.

[0022] Attachment Figure 2 Schematic diagrams of top views of the structures of embodiments one to four of the present invention.

[0023] Attachment Figure 3 For attachment Figure 2 Schematic diagram of the enlarged cross-sectional structure of the cross arm at AA.

[0024] Attachment Figure 4 For attachment Figure 2 Schematic diagram of the enlarged cross-sectional view from above of the cross arm.

[0025] Attachment Figure 5 For attachment Figure 1 Schematic diagram of the enlarged structure of the cross arm viewed from above.

[0026] Attachment Figure 6 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the cross arm.

[0027] Attachment Figure 7 Schematic diagrams of the three-dimensional structures of embodiments one to seven of the present invention.

[0028] Attachment Figure 8 For attachment Figure 7 Schematic diagram of the three-dimensional structure of the first load sensor.

[0029] Attachment Figure 9 This is a schematic diagram of a partial cross-sectional structure of the main view of embodiment 8 of the present invention.

[0030] Attachment Figure 10 The left side partial cross-sectional structure diagram of the right donkey head in the eighth embodiment of the present invention is shown. Figure 1 .

[0031] Attachment Figure 11 Schematic diagram of the three-dimensional structure of the right donkey head in the eighth embodiment of the present invention Figure 1 .

[0032] Attachment Figure 12 The left side partial cross-sectional structure diagram of the right donkey head in the eighth embodiment of the present invention is shown. Figure 2 .

[0033] Attachment Figure 13 Schematic diagram of the three-dimensional structure of the right donkey head in the eighth embodiment of the present invention Figure 2 .

[0034] Attachment Figure 14 It is a schematic diagram of the partial cross-sectional structure of the ninth to eleventh embodiments of the present invention.

[0035] Attachment Figure 15 Schematic diagram of the three-dimensional structure of embodiments nine to eleven of the present invention.

[0036] Attachment Figure 16 For attachment Figure 15 Schematic diagram of the enlarged structure at point A in the middle.

[0037] Attachment Figure 17 Schematic diagram of the connection between the liquid storage box and the liquid storage tank in embodiments 9 to 11 of the present invention.

[0038] Attachment Figure 18 Schematic diagram of the circuit structure of the eleventh embodiment of the present invention.

[0039] The codes in the accompanying drawings are: 1 for cross arm, 2 for the first load sensor, 3 for the second load sensor, 4 for the connecting hole, 5 for the first test hole, 6 for the second test hole, 7 for the rear mounting slot, 8 for the notch, 9 for the sinking slot, 10 for the front limit hole, 11 for the rear limit hole, 12 for the protective patch, 13 for the fixing hole, 14 for the first threading hole, 15 for the second threading hole, 16 for the protective joint, 17 for the first connecting cable, 18 for the second connecting cable, 19 for the first positioning hole, 20 for the first positioning screw, 21 for the second positioning hole, 22 for the second positioning screw, 23 for the frame, 24 for the walking beam, 25 for the left donkey head, 26 for the right donkey head, 27 for Reducer, 28 is the drive motor, 29 is the controller, 30 is the crank, 31 is the connecting rod, 32 is the counterweight box, 33 is the counterweight wire rope, 34 is the fixing groove, 35 is the fixing seat, 36 is the connecting rod, 37 is the front oil pumping wire rope, 38 is the rear oil pumping wire rope, 39 is the front guide wheel, 40 is the rear guide wheel, 41 is the articulated shaft, 42 is the liquid storage box, 43 is the liquid storage tank, 44 is the first rotary joint, 45 is the first liquid inlet connecting pipeline, 46 is the second liquid inlet connecting pipeline, 47 is the first connecting joint, 48 is the liquid outlet pipeline, 49 is the first pump, 50 is the second pump, 51 is the liquid adding pipeline, 52 is the liquid return pipeline, and 53 is the third load sensor. DETAILED DESCRIPTION

[0040] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0041] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0042] The present invention will be further described below in conjunction with the embodiments and accompanying drawings: Example 1: As shown in the attached Figures 1 to 7 As shown, the integrated sensing protection device includes a crossarm 1, a first load sensor 2 and a second load sensor 3. A front mounting groove is provided on the front side of the crossarm 1, which is vertically penetrating and open to the front. A rear mounting groove 7 is provided on the rear side of the crossarm 1, which has the same structure as the front mounting groove and is symmetrically distributed. A first test hole 5 and a second test hole 6 are provided at intervals in front and back on the upper side of the crossarm 1 corresponding to the position between the front mounting groove and the rear mounting groove 7. A connecting hole 4 is provided in the center of the upper side of the crossarm 1 corresponding to the position between the first test hole 5 and the second test hole 6, and the first load sensor 2 and the second load sensor 3 are installed in the first test hole 5 and the second test hole 6, respectively.

[0043] According to requirements, the first load sensor 2 and the second load sensor 3 are both existing well-known technologies, such as EVT load sensors. During use, by setting the first test hole 5 and the second test hole 6, the first load sensor 2 and the second load sensor 3 can be integrated together. The setting of the front mounting slot and the rear mounting slot 7 makes it easy to connect the crossarm 1 and the light rod through the wire rope. The setting of the connecting hole 4 allows the crossarm 1 to be installed on the donkey head, so that the load exerted on the light rod during the up and down movement can be applied to the crossarm 1 through the wire rope. After the crossarm 1 interacts with the donkey head, the load can be transferred to the first load sensor 2 and the second load sensor 3. In this way, the first load sensor 2 and the second load sensor 3 can collect the load data exerted on the light rod during the up and down movement in real time, and calculate the average value (arithmetic mean) of the data collected by the first load sensor 2 and the data collected by the second load sensor 3, so that the collected load data can be more accurate. Concentrating the first load sensor 2 and the second load sensor 3 on the crossarm 1 can also reduce the difficulty of installation. The integrated sensing protection device in this application is installed on the donkey head of the oil pump, which can avoid the cable from breaking due to repeated bending during the up and down swinging of the donkey head, thereby extending the service life.

[0044] The above-mentioned integrated sensing protection device can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above example, as shown in the attached Figure 1 、 3 As shown in Figures 5, 6, and 7, the front mounting groove includes a notch 8 and a recessed groove 9. A U-shaped notch 8 that passes through the front and back and opens forward is provided on the front side of the cross arm 1. A recessed groove 9 that opens downward is provided on the lower front side of the cross arm 1. The upper part of the recessed groove 9 is connected to the lower part of the notch 8.

[0045] During use, the wire rope is sleeved in the notch 8, and the clamp is sleeved in the sink 9. The clamp is fixed to the end of the wire rope. After the wire rope is tightened upward, the upper part of the clamp and the step between the sink 9 and the notch 8 interact with each other, and the test ends of the first load sensor 2 and the second load sensor 3 interact with the donkey head, so that the wire rope can transmit the tension to the crossarm 1, which is convenient for collecting data on the tension exerted on the wire rope. The clamp can be an existing well-known technology, such as the Babbitt alloy method, that is, the lead block is melted at high temperature to form liquid lead and loose strands of wire rope are poured into the rope head cavity. After cooling, the two metals are fused together to make a braid rope head for the oil pump. The clamp can also be a pear-shaped rope sleeve (pear-shaped joint), which is convenient for disassembly and assembly between the integrated sensing protection device and the wire rope.

[0046] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 5 As shown, the cross section of the sink 9 is in an arc shape, and the diameter of the sink 9 is greater than the width of the notch 8.

[0047] As required, the distance between the central axis of the trough 9 and the front side of the crossarm 1 is greater than the diameter of the trough 9, and the central axis of the trough 9 coincides with the central axis of the rear portion of the notch 8. During use, this arrangement allows the end of the wire rope to be retained within the trough 9, i.e., the end of the braided rope of an existing cold-pressed oil pumping unit can be retained within the trough 9, allowing the load on the wire rope to be transferred to the crossarm 1.

[0048] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 3 、 4 As shown in Figures 6 and 7, a front limiting hole 10 is provided on the left front portion of the cross arm 1, and the right end of the hole 10 extends to the right side of the cross arm 1. The front limiting hole 10 is connected to the front of the notch 8, and a rear limiting hole 11 with the same structure as the front limiting hole 10 is provided on the left rear portion of the cross arm 1.

[0049] In this way, the wire rope is put into the front mounting groove and the rear mounting groove 7, and pins are inserted into the front limiting holes 10 and the rear limiting holes 11. In this way, the pins can limit the wire rope in the mounting groove, prevent the wire rope from separating from the mounting groove, and ensure that the wire rope is always in the mounting groove during use, so that the wire rope is reliably connected to the integrated sensing protection device. When disassembling, remove the pins in the limiting holes, and then take the wire rope out of the notch 8 of the mounting groove, and the integrated sensing protection device can be easily disassembled and maintained.

[0050] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 、 6 As shown in , 7 and 8 , a protective patch 12 is fixedly mounted on the upper end of the first load sensor 2 and the upper end of the second load sensor 3 , and the diameter of the protective patch 12 is larger than the diameter of the first test hole 5 .

[0051] According to the requirements, the test ends of the first load sensor 2 and the second load sensor 3 are fixedly installed with a protective patch 12. The protective patch 12 is integrated with the load sensor. There is a gap between the lower end of the protective patch 12 and the upper side of the crossarm 1. The diameter of the protective patch 12 is larger than the diameter of the first test hole 5. In this way, when the pressure value collected by the load sensor exceeds the set range, the lower end of the protective patch 12 and the upper side of the crossarm 1 contact each other. In this way, the protective patch 12 can protect the load sensor and prevent the load sensor from being damaged.

[0052] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2As shown in Figures 4, 6 and 7, a fixing hole 13 with an opening facing left is provided on the left side of the cross arm 1, and a first wire threading hole 14 and a second wire threading hole 15 respectively connected to the first test hole 5 and the second test hole 6 on the right are provided on the inner wall of the right part of the fixing hole 13. A protective joint 16 is fixedly installed in the fixing hole 13, a first connecting cable 17 with a first end connected to the first load sensor 2 is provided in the first wire threading hole 14, and a second connecting cable 18 with a first end connected to the second load sensor 3 is provided in the second wire threading hole 15. The second end of the second connecting cable 18 and the second end of the first connecting cable 17 are respectively connected to the corresponding positions of the protective joint 16.

[0053] According to the needs, the protective connector 16 is an existing well-known technology, such as an aviation plug or a waterproof plug, so that the plug and socket of the protective connector 16 can be quickly plugged and unplugged, which is convenient for the connection between the first load sensor 2 and the second load sensor 3 and the equipment. A connecting plate is fixed to the outer side of the right part of the protective connector 16 (socket), and the left side of the connecting plate and the right side of the cross arm 1 are detachably fixed together by 2 to 6 connecting screws distributed at intervals.

[0054] During use, the setting of the first wire threading hole 14 and the second wire threading hole 15 can integrate the first load sensor 2 and the second load sensor 3 into the cross arm 1, which can protect the first connecting cable 17 and the second connecting cable 18, avoiding fatigue damage of the first connecting cable 17 and the second connecting cable 18 in the harsh outdoor environment during use, reducing the failure rate, and ensuring that the first load sensor 2 and the second load sensor 3 can collect data normally.

[0055] Example 7: As an optimization of the above embodiment, as shown in the attached Figure 3 、 4 As shown in Figures 5 and 6, a first positioning hole 19 is provided on the lower front side of the cross arm 1, and the upper end of the first positioning hole 19 is connected to the lower part of the first test hole 5. A first positioning screw 20 is fixedly installed in the first positioning hole 19 so that the upper end is detachably fixed to the lower part of the first load sensor 2. A second positioning hole 21 is provided on the lower rear side of the cross arm 1, and the upper end of the second positioning hole 21 is connected to the lower part of the second test hole 6. A second positioning screw 22 is fixedly installed in the second positioning hole 21 so that the upper end is detachably fixed to the lower part of the second load sensor 3.

[0056] During use, by setting the first positioning screw 20 and the second positioning screw 22, the height of the test end of the first load sensor 2 and the second sensor can be adjusted so that the test end of the first load sensor 2 and the test end of the second load sensor 3 are at the same height. In this way, the data collected by the first load sensor 2 and the second load sensor 3 are more accurate. At the same time, it can also fix the first load sensor 2 and the second load sensor 3, avoiding the displacement of the first load sensor 2 and the second load sensor 3 during the movement of the crossarm 1, resulting in deviations in the collected data.

[0057] Example 8: As shown in the attached Figures 1 to 13 As shown, the automatic balancing walking beam pumping unit includes an integrated sensor protection device, a frame 23, an articulated shaft 41, a walking beam 24, a left donkey head 25, a right donkey head 26, a reducer 27, a counterweight box 32, a drive motor 28 and a controller 29. The upper side of the frame 23 and the lower side of the middle part of the walking beam 24 are hinged together by the articulated shaft 41. The left end of the walking beam 24 is detachably fixedly installed with the left donkey head 25. A counterweight wire rope 33 is fixedly connected between the left part of the left donkey head 25 and the upper side of the counterweight box 32 located below the left donkey head 25. The output shaft of the drive motor 28 is transmission-connected with the input shaft of the reducer 27. A crank 30 is fixedly installed on the outer side of the output shaft of the reducer 27. A connecting rod 31 is hingedly installed between the crank 30 and the lower side of the right part of the walking beam 24. The right end of the walking beam 24 is detachably fixedly installed with the right donkey head 26. A fixing groove 34 is provided on the upper left side of the right donkey head 26 corresponding to the upper position of the walking beam 24. A fixing seat 35 is fixedly installed in the fixing groove 34, and a front guide wheel 39 and a rear guide wheel 40 are installed on the upper left side of the right donkey head 26 in a front and rear interval-rotating manner. An integrated sensing protection device is provided on the lower side of the fixing seat 35, and a connecting rod 36 is installed in the communicating hole of the integrated sensing protection device. A front oil pumping wire rope 37, the first end of which is fixedly installed in the front mounting groove, is wrapped around the outer side of the upper part of the front guide wheel 39. The second end of the front oil pumping wire rope 37 passes around the outer side of the right part of the right donkey head 26 and is located below the right donkey head 26. A rear oil pumping wire rope 38, the first end of which is fixedly installed in the rear mounting groove 7, is wrapped around the outer side of the upper part of the rear guide wheel 40. The second end of the rear oil pumping wire rope 38 passes around the outer side of the right part of the right donkey head 26 and is located below the right donkey head 26. The first load sensor 2 and the second load sensor 3 are both connected to the controller 29, and the controller 29 is connected to the drive motor 28.

[0058] According to the needs, the controller 29 is an existing well-known technology, such as a programmable controller or an RTU monitor. In order to facilitate the disassembly and maintenance between the integrated sensing protection device and the right donkey head 26, an existing well-known pulley frame is installed in the fixed groove 34 at the position above the corresponding fixed seat 35. Two fixed pulleys are rotatably installed in the pulley frame. The two fixed pulleys are arranged at intervals up and down. The first end of the front oil pumping wire rope 37 passes around the upper fixed pulley and is fixedly connected to the first end of the rear oil pumping wire rope 38. That is, the front oil pumping wire rope 37 and the rear oil pumping wire rope 38 are a wire rope, and a connecting wire rope is wrapped around the outer side of the upper fixed pulley below. The two ends of the connecting wire rope pass through the fixed seat 35 and are fixedly installed in the front mounting groove and the rear mounting groove 7 respectively. The upper end of the connecting rod 36 is screwed to the fixed seat 35 Connected together, the outer side of the lower part of the connecting rod 36 is sleeved in the connecting hole 4, and the lower end of the connecting rod 36 is fixed with a ring platform in contact with the lower side of the cross arm 1. The connecting rod 36 can adjust the distance between the upper end of the protective patch 12 and the lower side of the fixing seat 35, so that the two protective patches 12 of the integrated sensing protection device are in contact with the lower side of the fixing seat 35. When the right donkey head 26 swings upward, the integrated sensing protection device collects the tension of the right donkey head 26 on the light rod. When the right donkey head 26 swings downward, the integrated sensing protection device collects the tension of the light rod on the cross arm 1. The counterweight box 32 is an existing well-known technology. It can be a closed shell filled with counterweight material (such as concrete), or it can be a box structure with multiple installation cavities, and a counterweight block can be removably installed in each installation cavity.

[0059] When in use, the second end of the rear pumping wire rope 38 and the second end of the front pumping wire rope 37 are fixedly connected to the suspension rope, and the integrated sensing protection device is arranged between the lower side of the fixing seat 35 and the top of the walking beam 24. The first load sensor 2 and the second load sensor 3 are both connected to the controller 29. The protective connector 16 of the integrated sensing protection device is connected to the controller 29 through a cable. The cable is laid along the side of the walking beam 24 and the surface of the frame 23. In this way, the cable will not bend during the process of swinging up and down with the donkey head. The dynamometer installed on the suspension rope has a large amplitude of up and down movement with the suspension rope, and the cable between the dynamometer and the controller 29 is prone to breakage and damage due to bending. Installing the integrated sensing protection device on the lower side of the fixing seat 35 of the right donkey head 26 can extend the service life of the cable connecting the integrated sensing protection device and the controller 29 and reduce the failure rate of the oil pumping unit.

[0060] Example 9: As shown in the attached Figure 14 、 15As shown in Figure 16, a liquid storage tank 42 is installed at the lower part of the left donkey head 25, and a delivery pump and a liquid storage tank 43 are provided below the left donkey head 25. The delivery pump can deliver the liquid filled in the liquid storage tank 43 to the liquid storage tank 42 to increase the weight of the left donkey head 25, and the delivery pump can deliver the liquid in the liquid storage tank 42 to the liquid storage tank 43 to reduce the weight of the left donkey head 25.

[0061] During use, such a setting facilitates the adjustment of the weight of the counterweight box 32. When the oil pump needs to adjust the counterweight due to changes in the underground oil reservoir and downhole working conditions during operation, the weight of the liquid in the liquid storage tank 42 can be adjusted through the delivery pump without stopping the machine, thereby adjusting the counterweight on the left donkey head 25 and the load of the liquid storage tank 42 to facilitate adjustment of the appropriate counterweight. This can avoid the oil pump stopping and affecting production efficiency. When adjusting the weight of the counterweight box 32, it can also reduce the safety risks of the operator when taking and placing the counterweight blocks in the counterweight box 32, making the balance adjustment operation of the oil pump more convenient and safer.

[0062] When the load of the upper lifting rod becomes larger, it is necessary to increase the load on the left end of the walking beam 24. The liquid in the liquid storage tank 43 is transported to the liquid storage tank 42 through the delivery pump, thereby increasing the load on the left end of the walking beam 24. When the load of the upper lifting rod becomes smaller, it is necessary to reduce the load on the left end of the walking beam 24. The liquid in the liquid storage tank 42 is transported to the liquid storage tank 43 through the delivery pump, thereby reducing the load on the left end of the walking beam 24. This can reduce the load on the oil pumping unit motor, reduce power consumption and achieve energy-saving effects.

[0063] According to the needs, the liquid storage tank 42 is a closed U-shaped box with an opening upward. The lower part of the liquid storage tank 42 is provided with a drainage hole communicating with the inside and outside. The drainage hole is sealed with a plug wire to facilitate the replacement of new liquid after all the liquid in the liquid storage tank 42 is drained or the inner wall of the liquid storage tank 42 is cleaned. The liquid storage tank 42 can also be a square box. The lower part of the left donkey head 25 is provided with a mounting through hole that passes through the front and back. The middle part of the liquid storage tank 42 is fixedly installed in the mounting through hole. In order to prevent the liquid in the liquid storage tank 42 and the liquid storage tank 43 from being heated at a lower temperature, the liquid in the liquid storage tank 42 and the liquid storage tank 43 is fixedly installed in the mounting through hole. In the event of freezing in the environment, the liquid circulating in the liquid storage tank 43 and the liquid storage tank 42 is an existing well-known antifreeze, such as a special antifreeze for -35 degree floor heating air. An insulation layer can also be installed on the outside of the delivery pump, liquid storage tank 42, liquid storage tank 43 and the connecting pipes therebetween. The liquid storage tank 42 and the liquid storage tank 43 are both made of high-strength composite materials. The capacity of the liquid storage tank 43 is 3.5 cubic meters, and the capacity of the liquid storage tank 42 is 2.8 to 3 cubic meters. This can meet the balance adjustment of most oil pumping units in the well site.

[0064] Example 10: As shown in the attached Figure 14 、 15As shown in , 16 and 17, the outer side of the liquid storage tank 42 is provided with a liquid inlet and a liquid outlet that are connected inside and outside. A first rotary joint 44 is installed in front of the hinge shaft 41. The front part of the first rotary joint 44 is separated by a first liquid inlet and a second liquid inlet, and the rear part of the first rotary joint 44 is separated by a first liquid outlet and a second liquid outlet. The first liquid outlet is connected to the first liquid inlet, and the second liquid outlet is connected to the second liquid inlet. A liquid inlet pipeline is fixedly connected between the first liquid outlet and the liquid inlet, and a liquid outlet pipeline 48 is fixedly connected between the second liquid outlet and the liquid outlet. The delivery pump includes a first pump 49 and a second pump 50. The outlet of the liquid storage tank 43 is fixedly connected to the inlet of the first pump 49, and a liquid adding pipeline 51 is fixedly connected between the outlet of the first pump 49 and the first liquid inlet. The inlet of the liquid storage tank 43 is fixedly connected to the outlet of the second pump 50, and a liquid return pipeline 52 is fixedly connected between the inlet of the second pump 50 and the second liquid inlet.

[0065] According to needs, in order to facilitate the disassembly and assembly of the left donkey head 25 and the walking beam 24, the liquid inlet pipeline includes a first liquid inlet connecting pipeline 45, a second liquid inlet connecting pipeline 46 and a first connecting joint 47. The first end of the first liquid inlet connecting pipeline 45 is fixedly connected to the liquid inlet hole, and the second end of the first liquid inlet connecting pipeline 45 and the first end of the second liquid inlet connecting pipeline 46 are detachably fixedly connected together through the first connecting joint 47. The second end of the second liquid inlet connecting pipeline 46 is fixedly connected to the first liquid outlet. The first connecting joint 47 can be an existing well-known technology, such as a hose joint, a hydraulic pipe joint, a flexible joint or a union joint. The liquid outlet pipeline 48 has the same structure as the liquid inlet pipeline, which facilitates the rapid disassembly and assembly between the left donkey head 25 and the walking beam 24.

[0066] The first rotary joint 44 is a known technology, such as a hydraulic oil multi-channel rotary joint or a dual-channel rotary joint (MF02040 cooling water rotary joint), or a dual-channel rotary joint as described in the Chinese document with the announcement number CN217056746U. The rotating body of the first rotary joint 44 is coaxially arranged with the hinge shaft 41, and the fixed joint of the first rotary joint 44 is fixedly installed with the upper side of the frame 23 through a fixed seat. In this way, the first liquid inlet connecting pipeline 45 and the second liquid inlet connecting pipeline installed on the rotating body are connected. The connecting line 46 can rotate relative to the fixed joint, that is, the first liquid inlet connecting line 45 and the second liquid inlet connecting line 46 can swing back and forth with the walking beam 24, and can also be connected with the liquid adding line 51 and the liquid return line 52. In this way, during the operation of the pumping unit, the liquid storage tank 43 and the liquid storage tank 42 can be connected, which is convenient for adding antifreeze into the liquid storage tank 42 to increase the load on the left end of the walking beam 24 or extracting antifreeze to reduce the load on the right end of the walking beam 24. The first rotary joint 44 can also be installed behind the hinge shaft 41.

[0067] A second rotary joint can also be set in front and behind the hinge shaft 41. The second rotary joint is an existing well-known technology, such as a single-channel rotary joint, or a single-channel rotary joint disclosed in the Chinese patent document announced as CN209469916U. The outlet of the first pump 49 and the right end of the liquid inlet pipeline are fixedly connected through one of the second rotary joints, and the inlet of the second pump 50 and the right end of the liquid outlet pipeline 48 are fixedly connected through another second rotary joint. The first pump 49 and the second pump 50 are both existing well-known technologies, such as mud conveying pumps. The first pump 49 and the second pump 50 are both installed on the ground foundation. When the first pump 49 is working, the antifreeze in the liquid storage tank 43 can be pumped into the liquid storage tank 42, thereby increasing the load on the left end of the walking beam 24. When the second pump 50 is working, the antifreeze in the liquid storage tank 42 can be pumped back into the liquid storage tank 43, thereby reducing the load on the left end of the walking beam 24.

[0068] The first pump 49 can also be a mud delivery pump installed on the ground foundation, and the second pump 50 is a submersible pump installed in the liquid storage tank 42. The outlet of the submersible pump is connected to one end of the liquid outlet pipeline 48, and the other end of the liquid outlet pipeline 48 is fixedly connected to the second liquid outlet. A return liquid pipeline 52 is fixedly connected between the second liquid inlet and the inlet of the liquid outlet tank, so that the antifreeze in the liquid storage tank 42 can be quickly discharged into the liquid storage tank 43 for storage.

[0069] Example 11: As shown in the attached Figure 18 As shown, a third load sensor 53 for collecting load data of the left donkey head 25 is provided between the left end of the walking beam 24 and the left donkey head 25. The third load sensor 53 is connected to the controller 29, and the controller 29 is connected to the first pump 49 and the second pump 50 respectively.

[0070] According to the requirements, the third load sensor 53 is a conventional pin sensor, and the third load sensor 53 is installed between the upper left end of the walking beam 24 and the right part of the left donkey head 25 .

[0071] The controller 29 is used to determine the difference between the average value of the data collected by the first load sensor 2 and the second load sensor 3 and the data collected by the third load sensor 53, and to compare the difference between the average value of the data collected by the first load sensor 2 and the second load sensor 3 and the data collected by the third load sensor 53 with a set value: If the data collected by the third load sensor 53 is small, and the difference between the average value of the data collected by the first load sensor 2 and the second load sensor 3 and the data collected by the third load sensor 53 is greater than a set value, the set value can be set according to the change in load during the up and down movement of the polished rod. In this embodiment, the set value is 500 kg (5 kN), which means that the load on the right end of the walking beam 24 has increased. At this time, the controller 29 sends a start signal to the first pump 49, and the first pump 49 transports the antifreeze in the liquid storage tank 43 to the liquid storage tank 42 to increase the load on the left end of the walking beam 24. When the difference between the average value of the data collected by the first load sensor 2 and the second load sensor 3 and the data collected by the third load sensor 53 is less than or equal to the set value, the loads on the left and right ends of the walking beam 24 are in a balanced state. The controller 29 sends a stop signal to the first pump 49, and the first pump 49 stops working. In this way, when the load on the right end of the walking beam 24 increases, the balance of the pumping unit can be automatically adjusted. If the data collected by the third load sensor 53 is large, and the difference between the data collected by the third load sensor 53 and the average value of the data collected by the first load sensor 2 and the second load sensor 3 is greater than the set value, it means that the load on the right end of the walking beam 24 has become smaller. At this time, the controller 29 sends a start signal to the second pump 50, and the second pump 50 transports the antifreeze in the liquid storage tank 42 to the liquid storage tank 43 to reduce the load on the left end of the walking beam 24. When the difference between the data collected by the third load sensor 53 and the average value of the data collected by the first load sensor 2 and the second load sensor 3 is less than or equal to the set value, the loads on the left and right ends of the walking beam 24 are in a balanced state. The controller 29 sends a stop signal to the second pump 50, and the second pump 50 stops working. In this way, when the load on the right end of the walking beam 24 becomes smaller, the balance of the oil pump can be automatically adjusted.

[0072] In this way, the oil pumping unit can achieve balance adjustment during operation, reducing the labor intensity of the operator in carrying the counterweight during the balance adjustment process, and can also reduce the safety risks of the operator when taking and placing the counterweight block in the counterweight box 32, making the balance adjustment operation of the oil pumping unit more convenient and safer. The oil pumping unit can always maintain a balanced state during operation, which can reduce the load on the oil pumping unit motor, reduce power consumption and achieve energy-saving effects.

[0073] In order to prevent the first pump 49 from delivering too much antifreeze liquid into the liquid storage tank 42 and the second pump 50 from delivering all the antifreeze liquid in the liquid storage tank 42 to the liquid storage tank 43 and running idle, a conventional liquid level sensor, such as a submersible liquid level sensor, is provided in the liquid storage tank 42. The liquid level sensor is connected to the controller 29. When the liquid level of the antifreeze liquid delivered to the liquid storage tank 42 by the first pump 49 exceeds the upper limit value of the liquid level set in the controller 29, the first pump 49 stops working. If the data collected by the third load sensor 53 is small at this time, and the difference between the average value of the data collected by the first load sensor 2 and the second load sensor 3 and the data collected by the third load sensor 53 is greater than the set value, it means that the load on the right end of the walking beam 24 is too large, that is, the load increases during the up and down movement of the polished rod, and the polished rod may encounter resistance during the up and down movement. The controller 29 then stops the drive motor 28 and sends an alarm message to the monitoring center through wireless communication to prevent the load from increasing during the up and down movement of the polished rod and damaging the drive motor 28.

[0074] When the second pump 50 transports the antifreeze liquid in the liquid storage tank 42 to the liquid storage tank 43, causing the liquid level of the antifreeze liquid in the liquid storage tank 42 to be lower than the lower limit value of the liquid level set in the controller 29, the second pump 50 stops working. If the data collected by the third load sensor 53 is large at this time, and the difference between the data collected by the third load sensor 53 and the average value of the data collected by the first load sensor 2 and the second load sensor 3 is greater than the set value, it means that the load on the right end of the walking beam 24 is too small, that is, the load becomes smaller during the up and down movement of the light rod, and the light rod may break. Then the controller 29 stops the drive motor 28 and sends an alarm message to the monitoring center through wireless communication to avoid the drive motor 28 idling and doing useless work.

[0075] Since the load data of the walking beam 24 changes within a certain range when the light rod moves upward and downward, in order to prevent the change from causing the controller 29 to operate the first pump 49 and the second pump 50, the data collection period of the first load sensor 2, the second load sensor 3 and the third load sensor 53 is set to 3 to 10 seconds, so that the load change during the rising and falling conversion process of the light rod will not affect the operation of the controller 29 and the automatic adjustment of the balance of the pumping unit.

[0076] An existing well-known inclination sensor can be installed at the end of the articulated shaft 41. The inclination sensor, the first load sensor 2, the second load sensor 3 and the third load sensor 53 can be combined to generate a power map through the controller 29, so that the working environment of the oil pump can be analyzed and judged.

[0077] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. An integrated sensor protection device, characterized in that It includes a crossarm, a first load sensor and a second load sensor. A front mounting groove is provided on the front side of the crossarm, which is vertically penetrating and open to the front. A rear mounting groove is provided on the rear side of the crossarm, which has the same structure as the front mounting groove and is symmetrically distributed. A first test hole and a second test hole are provided at intervals in front and back on the upper side of the crossarm corresponding to the position between the front mounting groove and the rear mounting groove. A connecting hole is provided in the center of the upper side of the crossarm, which is vertically penetrating and opens to the front. The first load sensor and the second load sensor are installed in the first test hole and the second test hole, respectively.

2. The integrated sensor protection device according to claim 1, characterized in that The front mounting groove includes a notch and a sink. The front side of the cross arm is provided with a U-shaped notch that runs through the top and bottom and opens forward. The lower side of the front of the cross arm is provided with a sink that opens downward. The upper part of the sink is connected to the lower part of the notch.

3. The integrated sensor protection device according to claim 2, characterized in that The cross-section of the sink is an arc shape, and the diameter of the sink is greater than the width of the notch; or / and, a front limiting hole is provided on the left side of the front of the cross arm, the right end of which extends to the right side of the cross arm, and the front limiting hole is connected to the front of the notch, and a rear limiting hole with the same structure as the front limiting hole is provided on the left side of the rear of the cross arm.

4. The integrated sensor protection device according to claim 1, 2 or 3, characterized in that A fixing hole opening to the left is provided on the left side of the crossarm, and a first wire threading hole connected to the first test hole and a second wire threading hole connected to the second test hole are provided on the right side of the fixing hole. A protective joint is fixedly installed in the fixing hole, a first connecting cable with a first end connected to a first load sensor is provided in the first wire threading hole, and a second connecting cable with a first end connected to the second load sensor is provided in the second wire threading hole, and the second end of the second connecting cable and the second end of the first connecting cable are respectively connected to corresponding positions of the protective joint.

5. The integrated sensor protection device according to claim 1, 2 or 3, characterized in that A first positioning hole is provided on the lower side of the front portion of the cross arm, and the upper end of the first positioning hole is connected to the lower portion of the first test hole. A first positioning screw is fixedly installed in the first positioning hole, and the upper end of the first positioning screw is detachably fixed to the lower portion of the first load sensor. A second positioning hole is provided on the lower side of the rear portion of the cross arm, and the upper end of the second positioning hole is connected to the lower portion of the second test hole. A second positioning screw is fixedly installed in the second positioning hole, and the upper end of the second positioning screw is detachably fixed to the lower portion of the second load sensor.

6. The integrated sensor protection device according to claim 4, characterized in that A first positioning hole is provided on the lower side of the front portion of the cross arm, and the upper end of the first positioning hole is connected to the lower portion of the first test hole. A first positioning screw is fixedly installed in the first positioning hole, and the upper end of the first positioning screw is detachably fixed to the lower portion of the first load sensor. A second positioning hole is provided on the lower side of the rear portion of the cross arm, and the upper end of the second positioning hole is connected to the lower portion of the second test hole. A second positioning screw is fixedly installed in the second positioning hole, and the upper end of the second positioning screw is detachably fixed to the lower portion of the second load sensor.

7. An automatic balancing beam pumping unit using the integrated sensor protection device according to any one of claims 1 to 6, characterized in that It includes an integrated sensing protection device, a frame, an articulated shaft, a rocker beam, a left donkey head, a right donkey head, a reducer, a counterweight box, a drive motor and a controller. The upper side of the frame is hingedly installed with the lower side of the middle part of the rocker beam through an articulated shaft. The left end of the rocker beam is detachably fixed with the left donkey head. A counterweight wire rope is fixedly connected between the left part of the left donkey head and the upper side of the counterweight box located below the left donkey head. The output shaft of the drive motor is transmission-connected with the input shaft of the reducer. A crank is fixedly installed on the outside of the output shaft of the reducer. A connecting rod is hingedly installed between the crank and the lower side of the right part of the rocker beam. The right end of the rocker beam is detachably fixed with the right donkey head. A fixing groove is provided on the left side of the upper part of the right donkey head corresponding to the position above the rocker beam. A fixing seat is fixedly installed in the fixing groove. A front guide wheel and a rear guide wheel are installed on the upper left side of the donkey head in a front and rear rotational manner. An integrated sensing protection device is provided on the lower side of the fixed seat. A connecting rod with an upper end installed together with the fixed seat is installed in the connecting hole of the integrated sensing protection device. A front oil-pumping wire rope with a first end fixedly installed in the front mounting groove is wound around the outer side of the upper part of the front guide wheel. The second end of the front oil-pumping wire rope passes around the outer side of the right part of the right donkey head and is located below the right donkey head. A rear oil-pumping wire rope with a first end fixedly installed in the rear mounting groove is wound around the outer side of the upper part of the rear guide wheel. The second end of the rear oil-pumping wire rope passes around the outer side of the right part of the right donkey head and is located below the right donkey head. The first load sensor and the second load sensor are both connected to the controller, and the controller is connected to the drive motor.

8. The automatic balancing beam pumping unit according to claim 7, characterized in that A liquid storage tank is installed at the lower part of the left donkey head, and a delivery pump and a liquid storage tank are provided under the left donkey head. The delivery pump can deliver the liquid filled in the liquid storage tank to the liquid storage tank to increase the weight of the left donkey head, and the delivery pump can deliver the liquid in the liquid storage tank to the liquid storage tank to reduce the weight of the left donkey head.

9. The automatic balancing beam pumping unit according to claim 8, characterized in that The outer side of the liquid storage tank is provided with a liquid inlet and a liquid outlet that are connected inside and outside. A first rotary joint is installed in front of the hinge shaft. The front part of the first rotary joint is separated by a first liquid inlet and a second liquid inlet. The rear part of the first rotary joint is separated by a first liquid outlet and a second liquid outlet. The first liquid outlet is connected to the first liquid inlet, and the second liquid outlet is connected to the second liquid inlet. A liquid inlet pipeline is fixedly connected between the first liquid outlet and the liquid inlet, and a liquid outlet pipeline is fixedly connected between the second liquid outlet and the liquid outlet. The delivery pump includes a first pump and a second pump. The outlet of the liquid storage tank is fixedly connected to the inlet of the first pump, and a liquid adding pipeline is fixedly connected between the outlet of the first pump and the first liquid inlet. The inlet of the liquid storage tank is fixedly connected to the outlet of the second pump, and a liquid return pipeline is fixedly connected between the inlet of the second pump and the second liquid inlet.

10. The automatic balancing beam pumping unit according to claim 9, characterized in that A third load sensor for collecting load data of the left donkey head is provided between the left end of the walking beam and the left donkey head. The third load sensor is connected to the controller, and the controller is connected to the first pump and the second pump respectively.

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