Three-protection horsehead of oil pumping unit

Abstract

The utility model relates to the technical field of oil pumping units, in particular to a three-protection horsehead of an oil pumping unit, which comprises a horsehead body, a mounting seat, a first pulley, a second pulley, a fixed seat and a fixed steel wire rope. When in use, the first end of the oil pumping steel wire rope bypasses the outer side of the upper part of the first guide wheel and the front part of the rope groove and then is fixedly mounted together with the front part of the beam hanger; then the second end of the oil pumping steel wire rope sequentially bypasses the outer side of the lower portion of the first pulley, the outer side of the upper portion of the second guide wheel and the rear portion of the rope groove and then is fixedly installed together with the rear portion of the beam hanger, then the left portion of the horse head body and the end portion of a walking beam of the beam-pumping unit are fixedly installed together, and finally the beam hanger and the upper end of a polish rod are fixedly installed together. The first guide wheel and the second guide wheel can also be integrally arranged, the oil pumping steel wire rope can be prevented from being separated from the rope grooves of the first guide wheel and the second guide wheel and falling off when the oil pumping unit three-protection horsehead works due to the arrangement of the baffles, and the fault rate can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumping units, in particular to a beam pumping unit donkey head, which is a three-guarantee donkey head for an oil pumping unit. Background Art

[0002] Existing pumping unit data acquisition (dynamometer data collection) is typically located on the polished rod or rope hanger, transmitting data via wired or wireless communication. This wired dynamometer reciprocates with the rod during operation (at a frequency of five times per minute, the cable reciprocates 7,200 times per day, or 2,628,000 times per year). This constant movement throughout the year significantly reduces the cable's service life.

[0003] Wireless power Figure 1 They are usually equipped with batteries and solar panels, but are limited by weather conditions and cannot send real-time data at a high frequency. Generally, data is collected every 30 minutes, which makes it difficult to guarantee the authenticity of the device data.

[0004] A Chinese patent document with publication number CN206419003U discloses a walking beam pumping unit and its donkey head, wherein the donkey head includes two side plates, a hanging shaft, a positioning member, a rope rack and an arc plate; the arc plate includes an inner recess and two flat plate portions; the inner recess is arranged between the two flat plate portions; the two flat plate portions are respectively connected to the two side plates; the inner recess is recessed toward the inner arc surface of the arc plate; the inner recess and the two flat plate portions both extend in the circumferential direction of the arc plate.

[0005] A Chinese patent document with publication number CN204477661U discloses a donkey head for an oil pump that can lubricate a hair braid. The upper and lower sections of the donkey head are each equipped with an oil storage chamber. The upper oil storage chamber and the lower oil storage chamber are connected by a pipe. An oil outlet component with a pulsating movement structure is provided on the contact track between the donkey head and the hair braid.

[0006] However, the pumping unit manufacturers generally do not equip the pumping units with sensors, overload and unload protection devices and power diagram equipment when they leave the factory. They need to be manually installed at the oil field site, which requires secondary operations and is time-consuming and labor-intensive. In addition, the traditional pumping wire rope is on the upper front end of the donkey head and is subject to the impact force of the wellhead during operation. The pumping wire rope and shaft pin on the donkey head are prone to breakage after the impact, which will shorten the service life of the pumping wire rope and shaft pin. Summary of the Invention

[0007] The utility model provides a three-protection donkey head for an oil pumping unit, which overcomes the shortcomings of the above-mentioned existing technologies. It mainly solves the problem that the steel wire rope of the existing oil pumping unit is at the upper front end of the donkey head and is subjected to the impact force of the wellhead during operation, resulting in a short service life of the steel wire rope and the shaft pin. Secondly, it can avoid equipment accidents caused by pump jamming, overloading, and untimely load loss feedback of the existing oil pumping unit.

[0008] The technical solution of the utility model is achieved through the following measures: a three-protection donkey head for an oil pumping unit, comprising a donkey head body, a mounting seat, a first pulley, a second pulley, a fixed seat and a fixed wire rope, a rope groove opening outward is provided on the right side of the donkey head body, a mounting groove opening upward is provided on the left upper part of the donkey head body, the upper end of the mounting groove is communicated with the upper end of the rope groove, a mounting seat is installed on the upper part of the mounting groove, a first pulley and a second pulley are provided at intervals above and below the mounting seat, a first guide wheel and a second guide wheel are provided at intervals front and back on the inner side of the upper part of the rope groove, a fixed seat is fixedly installed on the lower part of the mounting seat, the front part of the fixed seat is fixedly installed with the first end of the fixed wire rope, and the second end of the fixed wire rope is fixedly installed with the rear part of the fixed seat after passing around the outer side of the upper part of the second pulley.

[0009] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0010] The above-mentioned mounting seat may include a left mounting plate, a right mounting plate, an axle pin sensor, a pin shaft and a connecting piece. The left mounting plate and the right mounting plate are arranged in parallel on the left and right sides of the inner upper side of the mounting groove. The axle pin sensor is installed between the upper part of the left mounting plate and the upper part of the right mounting plate. The first pulley is installed on the outer side of the middle part of the axle pin sensor. The pin shaft is installed between the lower part of the left mounting plate and the lower part of the right mounting plate. The second pulley is installed on the outer side of the middle part of the pin shaft. Several connecting pieces are arranged circumferentially between the left mounting plate and the right mounting plate.

[0011] The outer sides of the left and right parts of the above-mentioned pin shaft can be provided with limit grooves opening upward. A left clamping plate is fixedly installed on the left side of the lower part of the left mounting plate, and the outer side of the lower part of the left clamping plate is located in the left limit groove. A right clamping plate is fixedly installed on the right side of the lower part of the right mounting plate, and the outer side of the lower part of the right clamping plate is located in the right limit groove.

[0012] The above-mentioned connecting parts may include connecting screws, connecting nuts, anti-slip pins and retaining springs. There are 2 to 8 support sleeves spaced between the right side of the upper left mounting plate and the left side of the upper right mounting plate. A connecting screw is passed through each support sleeve. The head of each connecting screw is located on the left side of the left mounting plate, and the screw end of each connecting screw is located on the right side of the right mounting plate. A connecting nut is threaded on the outer side of the screw end of each connecting screw. An anti-slip pin is installed between the lower part of the left mounting plate and the lower part of the right mounting plate corresponding to the position below the pin shaft. Anti-slip ring grooves are provided on the outer side of the left and right parts of the anti-slip pin, and a retaining spring is clamped in each anti-slip ring groove.

[0013] A fixing plate may be provided under the above-mentioned fixing seat, and a U-shaped front disassembly groove which passes through from top to bottom and opens forward is provided on the front side of the fixing plate, and a rear disassembly groove which is symmetrically arranged with the front disassembly groove is provided on the rear side of the fixing plate. The first end of the fixing wire rope is fixedly installed in the front disassembly groove after passing through the front part of the fixing seat, and the second end of the fixing wire rope is fixedly installed in the rear disassembly groove after passing through the rear part of the fixing seat. A load sensor is installed between the upper side of the fixing plate and the fixing seat at a position corresponding to the position between the front disassembly groove and the rear disassembly groove.

[0014] The upper side of the fixing seat corresponding to the front disassembly slot position can be provided with a front rope passing hole that passes through from top to bottom, and a front wear-resistant sleeve is fixedly installed in the front rope passing hole. The upper rear side of the fixing seat corresponding to the rear disassembly slot position is provided with a rear rope passing hole that passes through from top to bottom, and a rear wear-resistant sleeve is fixedly installed in the rear rope passing hole. The first end of the fixed steel wire rope passes through the front wear-resistant sleeve and is fixedly installed in the front disassembly slot, and the second end of the fixed steel wire rope passes through the rear wear-resistant sleeve and is fixedly installed in the rear disassembly slot.

[0015] The utility model has a reasonable and compact structure. When in use, the first end of the oil pumping wire rope is passed around the outer side of the upper part of the first guide wheel and the front part of the rope groove, and is fixedly installed together with the front part of the rope hanger. Then, the second end of the oil pumping wire rope is passed around the outer side of the lower part of the first pulley, the outer side of the upper part of the second guide wheel and the rear part of the rope groove in sequence, and is fixedly installed together with the rear part of the rope hanger. Then, the left part of the donkey head body is fixedly installed together with the end part of the walking beam of the walking beam oil pumping unit, and finally, the rope hanger is fixedly installed together with the upper end of the light rod. In this way, the three-protection donkey head of the oil pumping unit can be used. The first guide wheel and the second guide wheel can also be arranged in one piece. The setting of the baffle can prevent the oil pumping wire rope from separating and falling off from the rope grooves of the first guide wheel and the second guide wheel when the three-protection donkey head of the oil pumping unit is working, which can reduce the failure rate.

[0016] The setting of the mounting groove allows the oil pumping wire rope to pass around the first guide wheel and the second guide wheel and sleeve on the outer side of the lower part of the first pulley. In this way, after the donkey head body swings downward, the tension of the oil pumping wire rope will decrease, and there will be a gap between the oil pumping wire rope and the first guide wheel, the second guide wheel and the outer side of the first pulley. When the donkey head body swings upward or is impacted, the oil pumping wire rope first contacts the first guide wheel, the second guide wheel and the outer side of the first pulley. This provides a buffer space for the oil pumping wire rope, extending the service life of the oil pumping wire rope. The setting of the mounting groove can also provide space for the installation of sensors, overload, unload protection and power diagram equipment, making disassembly and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 It is a schematic diagram of the main cross-sectional structure of embodiments one to six of the present invention.

[0018] Attachment Figure 2 This is a left-side structural schematic diagram of embodiments 2 to 6 of the present invention with the left mounting plate removed.

[0019] Attachment Figure 3 Schematic diagram of the three-dimensional structure of the second to sixth embodiments of the present invention with the left mounting plate removed Figure 1 .

[0020] Attachment Figure 4 Schematic diagram of the three-dimensional structure of the second to sixth embodiments of the present invention with the left mounting plate removed Figure 2 .

[0021] Attachment Figure 5 This is a schematic diagram of the main structure of the mounting base in Examples 2 to 6 of the present invention.

[0022] Attachment Figure 6 This is a schematic diagram of the main cross-sectional structure of the mounting base in Examples 2 to 6 of the present invention.

[0023] Attachment Figure 7 For attachment Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Attachment Figure 8 It is a schematic diagram of the rear view structure of the mounting base in Examples 2 to 6 of the present invention.

[0025] Attachment Figure 9 Schematic diagram of the three-dimensional structure of the mounting base in embodiments 2 to 6 of the present invention.

[0026] Attachment Figure 10 It is a schematic diagram of the top structure of the fixing plate in Examples 5 to 6 of the present utility model.

[0027] The codes in the accompanying drawings are: 1 is the donkey head body, 2 is the first pulley, 3 is the second pulley, 4 is the fixed seat, 5 is the fixed wire rope, 6 is the rope groove, 7 is the mounting groove, 8 is the first guide wheel, 9 is the second guide wheel, 10 is the left mounting plate, 11 is the right mounting plate, 12 is the axle pin sensor, 13 is the pin shaft, 14 is the limit groove, 15 is the left clamping plate, 16 is the right clamping plate, 17 is the connecting screw, 18 is the connecting nut, 19 is the anti-slip pin, 20 is the retaining spring, 21 is the support sleeve, 22 is the baffle, 23 is the fixed plate, 24 is the front disassembly groove, 25 is the rear disassembly groove, 26 is the load sensor, 27 is the front wear-resistant sleeve, 28 is the rear wear-resistant sleeve, 29 is the oil pumping wire rope, and 30 is the rope hanger. DETAILED DESCRIPTION

[0028] 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.

[0029] In this utility model, 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

[0030] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0031] Example 1: As shown in the attached Figure 1 As shown, the three-protection donkey head of the oil pumping unit includes a donkey head body 1, a mounting seat, a first pulley 2, a second pulley 3, a fixed seat 4 and a fixed wire rope 5. A rope groove 6 opening outward is provided on the right side of the donkey head body 1, and a mounting groove 7 opening upward is provided on the left side of the upper part of the donkey head body 1. The upper end of the mounting groove 7 is communicated with the upper end of the rope groove 6. A mounting seat is installed on the upper part of the mounting groove 7. The first pulley 2 and the second pulley 3 are spaced apart from each other on the upper and lower parts of the mounting seat. A first guide wheel 8 and a second guide wheel 9 are spaced apart on the front and rear sides of the upper inner side of the rope groove 6. A fixed seat 4 is fixedly installed on the lower part of the mounting seat. The front part of the fixed seat 4 is fixedly installed with the first end of the fixed wire rope 5, and the second end of the fixed wire rope 5 is fixedly installed with the rear part of the fixed seat 4 after passing around the outer side of the upper part of the second pulley 3.

[0032] According to the needs, a baffle 22 is fixedly installed on the upper side of the donkey head body 1, and a through hole is formed between the lower side of the baffle 22 and the upper inner wall of the rope groove 6. A front-to-back rotating shaft is fixedly installed on the inner wall of the through hole, and the first guide wheel 8 and the second guide wheel 9 are rotatably installed on the outside of the rotating shaft. An annular rope groove 6 is provided on the outside of the first guide wheel 8 and the outside of the second guide wheel 9.

[0033] When in use, the first end of the oil pumping wire rope 29 is passed around the upper outer side of the first guide wheel 8 and the front of the rope groove 6, and then fixedly installed together with the front of the rope hanger 30, and then the second end of the oil pumping wire rope 29 is passed around the lower outer side of the first pulley 2, the upper outer side of the second guide wheel 9 and the rear of the rope groove 6 in sequence, and then fixedly installed together with the rear of the rope hanger 30, and then the left part of the donkey head body 1 is fixedly installed together with the walking beam end of the walking beam pumping unit, and finally the rope hanger 30 is fixedly installed together with the upper end of the polished rod. In this way, the three-protection donkey head of the oil pumping unit can be used, and the first guide wheel 8 and the second guide wheel 9 can also be arranged integrally. The setting of the baffle 22 can prevent the oil pumping wire rope 29 from separating and falling off from the rope groove 6 of the first guide wheel 8 and the second guide wheel 9 during operation, which can reduce the failure rate.

[0034] The setting of the mounting groove 7 allows the oil pumping wire rope 29 to pass around the first guide wheel 8 and the second guide wheel 9 and to be sleeved on the outer side of the lower part of the first pulley 2. In this way, after the donkey head body 1 swings downward, the tension of the oil pumping wire rope 29 will decrease, and there will be a gap between the oil pumping wire rope 29 and the first guide wheel 8, the second guide wheel 9 and the outer side of the first pulley 2. When the donkey head body 1 swings upward or is impacted, the oil pumping wire rope 29 first contacts the first guide wheel 8, the second guide wheel 9 and the outer side of the first pulley 2. This provides a buffer space for the oil pumping wire rope 29, thereby extending the service life of the oil pumping wire rope 29. The setting of the mounting groove 7 can also provide space for the installation of sensors, overload, unload protection and power diagram equipment, making disassembly and maintenance more convenient.

[0035] The above-mentioned three-protection donkey head of the oil pumping unit can be further optimized and / or improved according to actual needs:

[0036] Example 2: As an optimization of the above example, as shown in the attached Figures 1 to 9 As shown, the mounting seat includes a left mounting plate 10, a right mounting plate 11, an axle pin sensor 12, a pin shaft 13 and a connecting piece. The left mounting plate 10 and the right mounting plate 11 are arranged in parallel on the left and right sides of the inner upper side of the mounting groove 7. The axle pin sensor 12 is installed between the upper part of the left mounting plate 10 and the upper part of the right mounting plate 11. The first pulley 2 is installed on the outer side of the middle part of the axle pin sensor 12. The pin shaft 13 is installed between the lower part of the left mounting plate 10 and the lower part of the right mounting plate 11. The second pulley 3 is installed on the outer side of the middle part of the pin shaft 13. Several connecting pieces are arranged circumferentially between the left mounting plate 10 and the right mounting plate 11.

[0037] According to the requirements, the axle pin sensor 12 is an existing well-known technology, such as the DJZX-290 axle pin sensor. The first pulley 2 is rotatably installed on the outside of the axle pin sensor 12 between the left mounting plate 10 and the right mounting plate 11, and the second pulley 3 is rotatably installed on the outside of the pin shaft 13 between the left mounting plate 10 and the right mounting plate 11. When in use, the left part of the oil pumping wire rope 29 is sleeved on the outside of the lower part of the first pulley 2, the first pulley 2 acts on the axle pin sensor 12, and the second pulley 3 is connected to the fixing seat 4 through the fixed wire rope 5. The second pulley 3 acts on the pin shaft 13, so that the oil pumping wire rope 29 can be transmitted to the fixing seat 4 through the mounting seat when subjected to tension. In this way, after the donkey head body 1 swings downward, the tension of the oil pumping wire rope 29 will decrease, and the tension on the fixed wire rope 5 will also decrease. The oil pumping wire rope 29 and the first pulley 2 are connected. There will be gaps between the guide wheel 8, the second guide wheel 9 and the outside of the first pulley 2, and between the fixed wire rope 5 and the second pulley 3. When the donkey head body 1 swings upward or is impacted, the oil pumping wire rope 29 first contacts the first guide wheel 8, the second guide wheel 9 and the outside of the first pulley 2, and the oil pumping wire rope 29 tightens the first pulley, and then the fixed wire rope 5 tightens the second pulley 3. In this way, the oil pumping wire rope 29 will have a buffer space after being impacted, thereby extending the service life of the oil pumping wire rope 29.

[0038] Example 3: As an optimization of the above embodiment, as shown in the attached Figures 1 to 3 As shown in Figures 5 to 9, the outer left and right sides of the pin shaft 13 are provided with upward-opening limit grooves 14, a left clamping plate 15 is fixedly installed on the left side of the lower portion of the left mounting plate 10, and the outer lower portion of the left clamping plate 15 is located in the left limit groove 14, and a right clamping plate 16 is fixedly installed on the right side of the lower portion of the right mounting plate 11, and the outer lower portion of the right clamping plate 16 is located in the right limit groove 14.

[0039] According to the requirements, the limit slot 14 opens upward and runs through from front to back. The left clamping plate 15 and the right clamping plate 16 are fixedly mounted to the left mounting plate 10 and the right mounting plate 11 by connecting bolts. The left clamping plate 15 and the right clamping plate 16 are both rectangular. During use, the outer side of the lower portion of the left clamping plate 15 is located in the left limit slot 14, and the outer side of the lower portion of the right clamping plate 16 is located in the right limit slot 14. This can prevent the pin shaft 13 from separating from the left mounting plate 10 and the right mounting plate 11 after moving left and right. It can also prevent the pin shaft 13 from rotating when it rotates, thereby improving the stability of the installation between the left mounting plate 10, the right mounting plate 11 and the second pulley 3.

[0040] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2As shown in Figures 3, 5, 6, 8 and 9, the connecting parts include a connecting screw 17, a connecting nut 18, an anti-slip pin 19 and a retaining spring 20. There are 2 to 8 support sleeves 21 spaced apart between the upper right side of the left mounting plate 10 and the upper left side of the right mounting plate 11. A connecting screw 17 is passed through each support sleeve 21. The head of each connecting screw 17 is located on the left side of the left mounting plate 10, the screw end of each connecting screw 17 is located on the right side of the right mounting plate 11, and a connecting nut 18 is screwed onto the outer side of the screw end of each connecting screw 17. An anti-slip pin 19 is installed between the lower part of the left mounting plate 10 and the lower part of the right mounting plate 11 corresponding to the position below the pin shaft 13. Anti-slip ring grooves are provided on the outer left and right sides of the anti-slip pin 19, and a retaining spring 20 is clamped in each anti-slip ring groove.

[0041] According to the requirements, the left end of the anti-dropout pin 19 is located on the left side of the left mounting plate 10, and the right end of the anti-dropout pin 19 is located on the right side of the right mounting plate 11. The right end of the left retaining spring 20 contacts the left side of the left mounting plate 10, and the left end of the right retaining spring 20 contacts the right side of the right mounting plate 11. During use, by providing the support sleeve 21, the spacing between the left mounting plate 10 and the right mounting plate 11 can be maintained, preventing the left mounting plate 10 and the right mounting plate 11 from being worn against the end faces of the first pulley 2 and the second pulley 3 when the left mounting plate 10 and the right mounting plate 11 are close to each other, thereby extending the service life. When the pin shaft 13 breaks during use, the anti-dropout pin 19 is used to prevent the fixed wire rope 5 and the mounting seat from falling off, thereby playing a protective role.

[0042] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2 As shown in Figures 3 and 10, a fixing plate 23 is provided under the fixing seat 4, and a U-shaped front disassembly groove 24 which passes through from top to bottom and opens forward is provided on the front side of the fixing plate 23, and a rear disassembly groove 25 which is symmetrical to the front disassembly groove 24 is provided on the rear side of the fixing plate 23. The first end of the fixing wire rope 5 passes through the front part of the fixing seat 4 and is fixedly installed in the front disassembly groove 24. The second end of the fixing wire rope 5 passes through the rear part of the fixing seat 4 and is fixedly installed in the rear disassembly groove 25. A load sensor 26 is installed between the upper side of the fixing plate 23 and the fixing seat 4 at a position corresponding to the position between the front disassembly groove 24 and the rear disassembly groove 25.

[0043] According to the requirements, the fixing plate 23 can be provided with the load sensor 26 in one piece or in a separate piece. The fixing seat 4 is fixedly mounted on the lower part of the mounting groove 7 below the pin shaft 13. The load sensor 26 is a known technology, such as a load sensor or a dynamometer for detecting the wellhead performance of the SM35-AK pumping unit. The first and second ends of the fixed wire rope 5 are fixedly mounted with a known wire rope lock or a wire rope aluminum sleeve or a wire rope tensioner. The wire rope lock or the wire rope aluminum sleeve or the wire rope tensioner is installed in the front disassembly groove 24 and the rear disassembly groove 25, corresponding to the front disassembly groove 24 and A connecting hole for installing a load sensor 26 is provided on the upper middle side of the fixing plate 23 between the rear disassembly and assembly slots 25. The three-protection donkey head of the oil pumping unit of the present application replaces the working donkey head of the existing known walking beam oil pumping unit, such as replacing the donkey head of the walking beam oil pumping unit in the announcement number CN221400441U named as an anti-electricity theft energy-saving and efficiency-enhancing device for oil pumping units. Then, the axle pin sensor 12 and the load sensor 26 are electrically connected to the processor through cables, so that the load data information can be transmitted to the processor, and the working status of the walking beam oil pumping unit can be monitored in real time.

[0044] There is a gap between the fixing seat 4 and the fixing plate 23 to facilitate the installation of the load sensor 26. When in use, the load sensor 26 is electrically connected to the processor of the existing well-known walking beam pumping unit through a cable, so that the work diagram can be transmitted in real time to prevent the walking beam pumping unit from being overloaded, stuck and broken during operation, and can achieve the effects of overload protection, well jamming protection, load loss protection and rope breakage protection. When the pumping wire rope 29 reaches a load above the rated working load, a signal is sent, and the pumping unit is shut down to achieve overload protection; when the pumping wire rope 29 reaches a load lower than the set load, a signal is sent, and the pumping unit is shut down to achieve load loss protection; when an abnormality occurs underground, the real-time sensor data fluctuations are used to determine whether the pump is stuck, wax is deposited, sand is included, etc., and a signal is sent to take protective action to achieve pump jam protection; at the same time, the service life of the wire rope is extended.

[0045] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2 As shown in , 3, and 10, a front rope passing hole which passes through from top to bottom is provided on the upper side of the fixing seat 4 corresponding to the position of the front disassembly slot 24, and a front wear-resistant sleeve 27 is fixedly installed in the front rope passing hole. A rear rope passing hole which passes through from top to bottom is provided on the upper rear side of the fixing seat 4 corresponding to the position of the rear disassembly slot 25, and a rear wear-resistant sleeve 28 is fixedly installed in the rear rope passing hole. The first end of the fixed steel wire rope 5 passes through the front wear-resistant sleeve 27 and then is fixedly installed in the front disassembly slot 24. The second end of the fixed steel wire rope 5 passes through the rear wear-resistant sleeve 28 and then is fixedly installed in the rear disassembly slot 25.

[0046] During use, by setting the front wear-resistant sleeve 27 and the rear wear-resistant sleeve 28, the donkey head body 1 can avoid the wear of the fixed steel wire rope 5 caused by the mutual friction between the fixed steel wire rope 5 and the fixed seat 4 during the swing of the walking beam, and can extend the service life of the fixed steel wire rope 5.

[0047] The above technical features respectively constitute the various 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. A three-protection donkey head for oil pumping unit, characterized in that The donkey head comprises a body, a mounting seat, a first pulley, a second pulley, a fixed seat and a fixed steel wire rope, a rope groove opening outward is provided on the right side of the donkey head body, a mounting groove opening upward is provided on the left side of the upper part of the donkey head body, the upper end of the mounting groove is communicated with the upper end of the rope groove, a mounting seat is installed on the upper part of the mounting groove, a first pulley and a second pulley are provided at intervals above and below the mounting seat, a first guide wheel and a second guide wheel are provided at intervals front and back on the inner side of the upper part of the rope groove, a fixed seat is fixedly installed on the lower part of the mounting seat, the front part of the fixed seat is fixedly installed with the first end of the fixed steel wire rope, and the second end of the fixed steel wire rope is fixedly installed with the rear part of the fixed seat after passing around the outer side of the upper part of the second pulley.

2. The three-protection donkey head of the oil pumping unit according to claim 1 is characterized in that The mounting seat includes a left mounting plate, a right mounting plate, an axle pin sensor, a pin shaft and a connecting piece. The left mounting plate and the right mounting plate are arranged in parallel on the left and right inner sides of the upper part of the mounting groove. The axle pin sensor is installed between the upper part of the left mounting plate and the upper part of the right mounting plate. The first pulley is installed on the outer side of the middle part of the axle pin sensor. The pin shaft is installed between the lower part of the left mounting plate and the lower part of the right mounting plate. The second pulley is installed on the outer side of the middle part of the pin shaft. Several connecting pieces are arranged circumferentially between the left mounting plate and the right mounting plate.

3. The three-protection donkey head of the oil pumping unit according to claim 2 is characterized in that The left and right outer sides of the pin shaft are both provided with upward-opening limit grooves. A left clamping plate is fixedly installed on the left side of the lower part of the left mounting plate, and the outer side of the lower part of the left clamping plate is located in the left limit groove. A right clamping plate is fixedly installed on the right side of the lower part of the right mounting plate, and the outer side of the lower part of the right clamping plate is located in the right limit groove.

4. The three-protection donkey head for the oil pumping unit according to claim 2 or 3, characterized in that The connecting parts include connecting screws, connecting nuts, anti-slip pins and retaining springs. There are 2 to 8 support sleeves spaced between the right side of the upper left mounting plate and the left side of the upper right mounting plate. A connecting screw is passed through each support sleeve. The head of each connecting screw is located on the left side of the left mounting plate, and the screw end of each connecting screw is located on the right side of the right mounting plate. A connecting nut is threaded on the outer side of the screw end of each connecting screw. An anti-slip pin is installed between the lower part of the left mounting plate and the lower part of the right mounting plate corresponding to the position below the pin shaft. Anti-slip ring grooves are provided on the outer side of the left and right parts of the anti-slip pin, and a retaining spring is clamped in each anti-slip ring groove.

5. The three-protection donkey head for the oil pumping unit according to claim 1, 2 or 3, characterized in that A fixing plate is provided under the fixing seat, and a U-shaped front disassembly groove which passes through from top to bottom and opens forward is provided on the front side of the fixing plate, and a rear disassembly groove which is symmetrical to the front disassembly groove is provided on the rear side of the fixing plate. The first end of the fixing wire rope is fixedly installed in the front disassembly groove after passing through the front part of the fixing seat, and the second end of the fixing wire rope is fixedly installed in the rear disassembly groove after passing through the rear part of the fixing seat. A load sensor is installed between the upper side of the fixing plate and the fixing seat at a position corresponding to the position between the front disassembly groove and the rear disassembly groove.

6. The three-protection donkey head for the oil pumping unit according to claim 4 is characterized in that A fixing plate is provided under the fixing seat, and a U-shaped front disassembly groove which passes through from top to bottom and opens forward is provided on the front side of the fixing plate, and a rear disassembly groove which is symmetrical to the front disassembly groove is provided on the rear side of the fixing plate. The first end of the fixing wire rope is fixedly installed in the front disassembly groove after passing through the front part of the fixing seat, and the second end of the fixing wire rope is fixedly installed in the rear disassembly groove after passing through the rear part of the fixing seat. A load sensor is installed between the upper side of the fixing plate and the fixing seat at a position corresponding to the position between the front disassembly groove and the rear disassembly groove.

7. The three-protection donkey head for the oil pumping unit according to claim 5 is characterized in that A front rope threading hole that passes through from top to bottom is provided on the upper side of the fixing seat corresponding to the front disassembly slot position, and a front wear-resistant sleeve is fixedly installed in the front rope threading hole. A rear rope threading hole that passes through from top to bottom is provided on the upper rear side of the fixing seat corresponding to the rear disassembly slot position, and a rear wear-resistant sleeve is fixedly installed in the rear rope threading hole. The first end of the fixed steel wire rope passes through the front wear-resistant sleeve and is fixedly installed in the front disassembly slot, and the second end of the fixed steel wire rope passes through the rear wear-resistant sleeve and is fixedly installed in the rear disassembly slot.

8. The three-protection donkey head for the oil pumping unit according to claim 6 is characterized in that A front rope threading hole that passes through from top to bottom is provided on the upper side of the fixing seat corresponding to the front disassembly slot position, and a front wear-resistant sleeve is fixedly installed in the front rope threading hole. A rear rope threading hole that passes through from top to bottom is provided on the upper rear side of the fixing seat corresponding to the rear disassembly slot position, and a rear wear-resistant sleeve is fixedly installed in the rear rope threading hole. The first end of the fixed steel wire rope passes through the front wear-resistant sleeve and is fixedly installed in the front disassembly slot, and the second end of the fixed steel wire rope passes through the rear wear-resistant sleeve and is fixedly installed in the rear disassembly slot.

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