Oil pumping unit belt tightness automatic adjusting system

Abstract

The utility model discloses a system for automatically adjusting the tightness of a belt of an oil pumping unit, which is internally provided with a motor shifting mechanism, and an oil pumping unit motor is arranged on a motor movable support and a motor fixed support; the motor movable support is connected with an adjusting lead screw driven by a worm gear speed reducer in the motor shifting mechanism; a detection part of the belt rotating speed sensor is fixed on a large belt pulley of the oil pumping unit; a belt adjusting PLC (Programmable Logic Controller) is arranged in the oil well electric control cabinet and is respectively connected with the belt rotating speed sensor, the worm gear speed reducer and a four-information PLC in the oil well electric control cabinet through cables. According to the utility model, the purposes of automatically and accurately detecting the tightness of the motor belt and automatically adjusting are realized, the working efficiency is effectively improved, the labor intensity of workers is reduced, and the normal operation of the oil pumping unit is ensured.

Description

Technical Field

[0001] The utility model belongs to an adjusting device for an oil pumping unit belt in the petroleum industry, in particular to an automatic tension adjusting system for the oil pumping unit belt, which can automatically adjust the tension of the oil pumping unit motor belt. Background Art

[0002] At present, in the oil wells of the petroleum industry, if the pumping motor uses the old-style slide rail, to adjust the belt tightness of the motor once, the on-site operator needs to bring two jackscrews, adjustable wrenches, pipe clamps, crowbars and many other tools. The specific operation steps are as follows:

[0003] 1. After the oil pump is shut down, first loosen the fixing screws of the four oil pump motors; 2. Use the jackscrew and crowbar to move the motor forward; 3. After the motor is moved forward into place, remove the old belt and replace it with a new one; 4. Use the jackscrew and crowbar to move the motor backward, and then use the front and rear jackscrews to tighten the belt and adjust it to meet the "four-point one-line" requirements.

[0004] Each time the belt is replaced, the motor fixing screws must be loosened and the belt's "four-point straight line" must be readjusted using two top screws, causing excessive repetitive work and trouble for on-site operators.

[0005] The disadvantages of replacing the motor belt of the oil pump in the above manner are: 1. During shutdown operation, the operator comes into contact with electrical equipment such as the electric control cabinet, which poses a safety risk.

[0006] 2. When replacing the belt, you need to loosen the four motor fixing screws. This operation requires high standards. Otherwise, if the fixing screws are loosened too much, the screws will get stuck on the base and the motor will be unable to move forward. If the fixing screws are loosened too little, the friction between the motor and the base will be too great and the motor will be difficult to move.

[0007] 3. It takes a lot of tools to replace a belt, and the operation cannot be performed without enough tools.

[0008] 4. When adjusting the four-point straight line of the belt, a high level of technical skills is required for the operator. Otherwise, if the four-point straight line of the belt does not meet the standard, it will cause abnormal wear of the belt and increase production costs.

[0009] 5. The operation process is complicated and requires high technical level of operators. The key is that it is easy to repeat the operation and it takes too long, which reduces the opening rate of the oil well.

[0010] After searching, there are currently many technologies related to the adjustment of the oil pump belt, such as the following: 1. Patent application number: CN202120822916.0 discloses an automatic tensioning device for the oil pump belt, in which the card plate and the supporting vertical plate are connected by fixing bolts, and the seesaw is provided with two, and the roller shaft passes through the center ends of the roller and is connected to the lower part of the seesaw, and the elastic shaft passes through the two ends of the sleeve and is connected to the upper part of the seesaw, and the lower part of the adjusting rod is connected to the middle of the sleeve, and the adjusting rod passes through the slide of the supporting inclined plate, and the lower gasket, spring, and upper gasket are sequentially mounted on the adjusting rod above the supporting inclined plate, and an adjusting nut is provided on the upper part, and the fixed shaft passes through the middle and upper part of the seesaw and is connected to the fixing hole of the supporting vertical plate. The utility model is easy to install. The supporting vertical plate cooperates with the clamping plate to clamp the I-beam of the oil pump base, tighten the fixing bolts and the top screw, adjust the adjustment nut, adjust the spring force, and the roller presses the oil pump belt to increase the wrap angle of the oil pump belt to the active pulley and the driven pulley, thereby improving the transmission efficiency of the oil pump, saving energy and reducing consumption, and extending the service life of the belt.

[0011] The above-mentioned automatic belt tensioning device for an oil pump utilizes the expansion force of a spring to act on the back of the belt, thereby increasing the wrap angle of the oil pump belt with the driving pulley and the driven pulley, thereby improving the transmission efficiency of the oil pump. However, whether the service life of the belt can be extended after adding the friction pair needs to be verified.

[0012] 2. Patent application number: CN202021866517.6 discloses an automatic adjustment device for the belt of a walking beam oil pump. The utility model includes a device body, which includes a motor body and a motor mounting base. The motor body is mounted on the top surface of the motor mounting base. A base and a carrier plate are arranged in the motor mounting base. Baffles are arranged on both sides of the base, and the motor body is arranged between the two sets of baffles. A control box is arranged on the top of one side of the baffle. There are two sets of heavy-load guide rails and heavy-duty ball screws in the motor body. Both ends of each set of heavy-duty guide rails are welded and fixed to the middle part of the two sets of baffles near the edge. A heavy-duty thrust bearing is arranged in the middle part of the inner side of one baffle, and a heavy-duty ball screw is arranged in the middle of the heavy-duty thrust bearing. The device has a simple design structure and is easy to operate. The belt can be replaced without using tools, and the belt tightening work can be completed without stopping the machine. The working process saves time and effort, and improves the oil production time and efficiency while reducing labor intensity.

[0013] The above-mentioned automatic adjustment device for the belt of the walking beam pump is still in a manual adjustment state, and the adjustment level depends on the level of the operator, which is uncertain.

[0014] 3. The oil pumping unit belt tension elasticity regulator disclosed in patent application number: CN201720517453.0 mainly solves the problem that the existing oil pumping unit motor belt cannot be automatically adjusted. The upper end of one side of the bracket is tilted to the left, and a roller sliding bracket is slidably connected in the corresponding surface slideway in the bracket. The belt roller is connected to the roller sliding bracket, and the rotating shaft of the belt roller is connected to the long strip hole of the bracket. The upper spring shock-absorbing sleeve under the roller sliding bracket has a spring that is against the lower part of the roller sliding bracket. The upper spring shock-absorbing sleeve is connected to an adjustment screw rod through a right-handed thread, and there is an adjustment ratchet wrench on the adjustment screw rod. The lower part of the adjustment screw rod is connected to a left-handed adjustment nut through a left-handed thread, and the lower part of the left-handed adjustment nut is hinged to the lower end of the bracket. The oil pumping unit belt tension elasticity regulator has the characteristics of automatic adjustment function.

[0015] The above-mentioned oil pump belt tension elastic regulator uses the tilt bracket, spring and adjustment screw to jointly achieve belt tension adjustment, which is still in the category of manual adjustment. There is a problem of whether the belt tension adjustment compliance rate can be improved.

[0016] 4. The automatic tension adjustment device for the motor belt of the oil pump disclosed in patent application number CN201711442968.X can automatically move and adjust the tension between the motor and the belt of various types of oil pumps, and can also be used for the automatic movement and adjustment of various large motor belts in other places of use. The automatic tension adjustment device for the motor belt of the oil pump includes a bracket, a guide rail, a guide rail sleeve, a motor fixing seat and an adjustment screw. The guide rail sleeve is mounted on the outside of the guide rail, the bracket is fixed at both ends of the guide rail, the motor fixing seat is fixed on the guide rail sleeve, and the nut is fixed on the lower end surface of the motor fixing seat and is threadedly connected with the external thread of the adjustment screw installed in the bracket. The adjustment motor and the infrared proximity switch are connected to the data transmission control cabinet through cables, and the output shaft of the adjustment motor is meshed with the adjustment screw; the cable of the data transmission control cabinet is connected to the ground electrical control cabinet, and its data cable or wireless transmission equipment is connected to the regional network center, which has good use effect and application value.

[0017] The above invention uses an infrared proximity switch to automatically move and adjust the tightness between the motor and the belt of each type of oil pump. Although it can achieve automatic movement and adjustment. However, in actual operation, the infrared proximity switch is installed on the oil pump working in the field, and its accuracy is affected by temperature, which deteriorates. In addition, since the motor belt of the oil pump has obvious jumping phenomenon, the infrared proximity switch is used to determine the tightness of the motor belt. There is a large error conductivity, which is easy to misjudge and mislead. Since the infrared proximity switch is inaccurate in judging the motor belt of the oil pump, the use of its data to transmit to the control cabinet to operate the motor to adjust the belt tension is also inaccurate, and still needs to be improved. Summary of the invention

[0018] The purpose of the utility model is to provide an automatic belt tension adjustment system for an oil pumping unit, which overcomes the current situation that most of the automatic belt tension adjustment devices are still in manual adjustment, solves the problem that the current automatic belt tension adjustment devices for oil pumping units rely on infrared proximity switches to judge the tension of the oil pumping unit motor belt, and improves the reliability of judging the tension of the oil pumping unit motor belt, making the automatic adjustment of the oil pumping unit motor belt convenient and reliable, reducing the labor intensity of workers and ensuring the normal operation of the oil pumping unit.

[0019] The technical solution of the utility model is: an automatic adjustment system for the tension of an oil pumping unit belt, provided with a motor shifting mechanism, wherein: the oil pumping unit motor is installed on a motor movable support and a motor fixed support in the motor shifting mechanism; the motor movable support is connected to an adjustment screw driven by a worm gear reducer in the motor shifting mechanism; the detection part of the belt speed sensor is fixed on a large pulley of the oil pumping unit; the motor shifting mechanism is fixed on a pumping unit base on one side of the oil pumping unit motor; a belt adjustment PLC is installed in the oil well electric control cabinet, and the belt adjustment PLC is connected to the belt speed sensor, the worm gear reducer and the four-information PLC in the oil well electric control cabinet through cables.

[0020] Preferably, the belt speed sensor is a Hall sensor, and the magnetic piece of the detection part of the Hall sensor is adsorbed on the side of the large pulley connected to the input shaft of the oil pump reduction box.

[0021] Preferably, the receiving part of the Hall sensor is fixed on the reducer box of the oil pumping unit and is able to receive the information sent by the magnetic piece of the detection part.

[0022] Preferably, one end of the worm gear reducer in the motor shifting mechanism is placed on the rear side of the oil pump motor.

[0023] Preferably, a belt limit sensor is also fixed on the inner side of the worm gear reducer, and the belt limit sensor is connected to the belt adjustment PLC via a cable.

[0024] Preferably, a lead screw connecting nut is fixed in the movable support of the motor, and a lead screw through hole is provided in the fixed support of the motor; the adjusting lead screw, the movable support of the motor and the fixed support of the motor are all installed in the adjusting support.

[0025] Preferably, both the movable motor support and the fixed motor support are provided with a pumping unit motor fixing groove, which is respectively arranged in the support body on both sides of the screw connecting nut and the screw through hole in the movable motor support and the fixed motor support.

[0026] Preferably, the adjustment support is mainly composed of a rear support, a front support and two guide rods, and the movable motor support and the fixed motor support are sleeved on the outside of the two guide rods through bushings and pressure plates, and the two ends of the two guide rods are respectively fixed in the fixing sleeves in the rear support and the front support by bolts; the rear support and the front support are both L-shaped seat bodies and a fixing sleeve is arranged in the L-shaped vertical seat body, and a support adjustment groove is arranged in the L-shaped horizontal seat body, and the support adjustment groove is a longitudinal groove.

[0027] Preferably, a bearing fixing nut and a bearing seat are respectively installed and fixed in the vertical seat body of the rear support, the bearing fixing nut is installed in the vertical seat body of the rear support, and the bearing seat is fixed to the inner side of the vertical seat body; one end of the adjusting screw passes through the thrust bearing installed in the bearing seat and the bearing fixing nut fixed in the rear support to be connected to the output shaft of the worm gear reducer.

[0028] Preferably, the pumping unit motor fixing groove is arranged in the seat body on the upper part of the motor movable support and the motor fixed support, and the seat body part corresponding to the pumping unit motor fixing groove is a cavity; the groove width of the pumping unit motor fixing groove is larger than the rod body of the pumping unit motor fixing bolt and smaller than the outer circle formed by the hexagonal head of the fixing bolt.

[0029] Compared with the prior art, the utility model has a significant use effect in that the utility model fixes the detection part of the belt speed sensor on the large pulley of the oil pump, and the speed information of the large pulley received by the belt speed sensor can be transmitted to the belt adjustment PLC in real time. Because the speed of the large pulley will change due to the tightness of the motor belt, when the motor belt is loose, the speed of the large pulley will slow down, and at this time it will be received by the belt speed sensor and transmitted to the belt adjustment PLC.

[0030] Since the motor belt tension adjustment program is programmed in the belt adjustment PLC and the adjustment parameter range is established, when the motor belt reaches the parameters that need to be adjusted, that is, when the speed range of the large pulley that needs to be adjusted is reached, the belt adjustment PLC automatically starts the worm gear reducer in the motor shift mechanism, and drives the adjustment screw connected to the motor movable support to rotate through the worm gear reducer, thereby pulling the motor movable support equipped with the pumping unit motor, so that the pumping unit motor is shifted and the motor belt is tightened.

[0031] The belt adjustment PLC is connected to the four-information information PLC through cables, which can make full use of the existing information transmission equipment to transmit the operating information of the motor belt of the oil pump motor to the four-information network center in real time and then feed it back to the specific production management unit through the four-in-one network center, so that the specific production management unit can make corresponding management responses.

[0032] In order to solve the problem of the troublesome four-point straight-line adjustment of the oil pump motor belt in the prior art, the motor shifting mechanism in the utility model is not only easy to install, but also an oil pump motor fixing groove is arranged in the movable motor support and the motor fixed support, so that when the motor is installed for the first time, the oil pump motor can be conveniently moved radially by the crowbar to adjust the motor belt in the four-point straight-line.

[0033] After installing the utility model, the motor belt is adjusted to the four-point line once and the motor fixing bolts are tightened before it is put into use. In the future, as long as the motor is not replaced, there is no need to adjust the motor belt to the four-point line. When the motor belt is replaced again, there is no need to adjust the motor belt to the four-point line. The purpose of automatically and accurately detecting the tightness of the motor belt and automatically adjusting it is achieved, which effectively improves the work efficiency. It is specifically manifested in:

[0034] 1. When replacing the motor belt, no tools are required, which effectively reduces the labor intensity of employees.

[0035] 2. This system runs automatically and can always keep the motor belt at an appropriate tightness, thus extending its service life.

[0036] 3. The adjustment support in this system can be adjusted as a whole to a certain distance, and various types of oil pump motors can be fixed in the movable motor support and the fixed motor support.

[0037] 4. The adjusting support in the motor shifting mechanism of the system and the movable motor support and fixed motor support installed therein are all split-type designs and can be disassembled, and are suitable for use with all pumping motors ranging from 18.5 kW to 55 kW in the current oil production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 It is a front view of the schematic diagram of the structure of the motor shifting mechanism in the utility model.

[0040] Figure 2 for Figure 1 Top view of the .

[0041] Figure 3 for Figure 1 Schematic diagram of the structure of the adjustment support.

[0042] Figure 4 This is a working principle diagram of the utility model.

[0043] In the figure: worm gear reducer 1, rear support 2, bearing fixing nut 3, support adjustment slot 4, bearing seat 5, thrust bearing 6, adjusting screw 7, screw connecting nut 8, motor movable support 9, motor fixed support 10, front support 11, belt speed sensor 12, guide rod 13, bushing 14, pressure plate 15, belt limit sensor 16, belt adjustment PLC 17, pumping unit motor fixing slot 18, four-information PLC 19, pumping unit motor 20, large pulley 21. DETAILED DESCRIPTION

[0044] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0045] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0046] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0047] See also Figures 1 to 4, an automatic tension adjustment system for an oil pumping unit belt is provided with a motor shifting mechanism, wherein: an oil pumping unit motor 20 is installed on a motor movable support 9 and a motor fixed support 10 in the motor shifting mechanism; the motor movable support 9 is connected to an adjusting screw 7 driven by a worm gear reducer 1 in the motor shifting mechanism; the detection part of a belt speed sensor 12 is fixed on a large pulley 21 of the oil pumping unit; the motor shifting mechanism is fixed on an oil pumping unit base on one side of the oil pumping unit motor 20; a belt adjustment PLC 17 is installed in an oil well electric control cabinet, and the belt adjustment PLC 17 is connected to the belt speed sensor 12, the worm gear reducer 1 and the four-information PLC 19 in the oil well electric control cabinet through cables.

[0048] The utility model fixes the detection part of the belt speed sensor 12 on the large pulley 21 of the oil pump, and the speed information of the large pulley 21 received by the belt speed sensor 12 can be transmitted to the belt adjustment PLC17 in real time. Because the speed of the large pulley 21 will change due to the tightness of the motor belt, when the motor belt is loose, the speed of the large pulley 21 will slow down, and at this time it will be received by the belt speed sensor 12 and transmitted to the belt adjustment PLC17, and the motor belt will be automatically tightened according to the adjustment parameters set in the belt adjustment PLC17 program.

[0049] The belt adjustment PLC17, i.e., a programmable logic controller, can program the motor belt tension adjustment program and formulate the adjustment parameter range in the belt adjustment PLC17. When the motor belt reaches the parameter that needs to be adjusted, that is, when it reaches the speed range that the large pulley 21 needs to be adjusted, the belt adjustment PLC17 automatically starts the worm gear reducer 1 in the motor shifting mechanism, and drives the adjustment screw 7 connected to the motor movable support 9 to rotate through the worm gear reducer 1, thereby pulling the motor movable support 9 equipped with the pumping unit motor 20, so that the pumping unit motor 20 is shifted and the motor belt is tightened.

[0050] The belt adjustment PLC17 is connected to the four-information information PLC19 through a cable, and can make full use of the existing information transmission equipment to transmit the operation information of the motor belt of the pumping unit motor 20 to the four-information network center in real time and feedback to the specific production management unit through the four-information network center, so that the specific production management unit can make corresponding management responses. The touch screen on the belt adjustment PLC17 displays information such as the rotation speed of the large pulley 21, and the automatic belt tension adjustment system can also be adjusted through the touch screen.

[0051] Based on the above embodiment 1, the utility model also has the following embodiments:

[0052] A preferred embodiment: the belt speed sensor 12 is a Hall sensor, and the magnetic piece of the detection part of the Hall sensor is adsorbed on the side of the large pulley 21 connected to the input shaft of the oil pump reduction box.

[0053] A preferred embodiment: the receiving part of the Hall sensor is fixed on the reducer of the pumping unit and can receive the information sent by the magnetic piece of the detection part. The Hall sensor is a wireless sensor, and the magnetic piece of its detection part can be conveniently adsorbed on the side of the large pulley 21 and wirelessly transmit the speed information of the large pulley 21 to the receiving part of the Hall sensor.

[0054] A preferred embodiment: one end of the worm gear reducer 1 in the motor shifting mechanism is placed on the rear side of the pumping unit motor 20. In this way, when the motor belt needs to be adjusted to be loose, the adjusting screw 7 driven by the worm gear reducer 1 can be pulled backward to move the movable motor support 9 fixing the pumping unit motor 20 backward and adjust the tightness of the motor belt. This is convenient for operation and installation. Of course, one end of the worm gear reducer 1 can also be placed on the front side of the pumping unit motor 20, and the adjusting screw 7 driven by the worm gear reducer 1 can be pushed forward to move the movable motor support 9 fixing the pumping unit motor 20 forward; because in this way, the worm gear reducer 1 in the motor shifting mechanism must be installed below the large pulley 21, and although its installation method is compact, the working environment of the motor shifting mechanism is relatively not very safe.

[0055] A preferred embodiment: A belt limit sensor 16 is also fixed on the inner side of the worm gear reducer 1, and the belt limit sensor 16 is connected to the belt adjustment PLC 17 through a cable. The purpose of setting the belt limit sensor 16 is to be able to easily know the distance between the oil pump motor 20 and the worm gear reducer 1, that is, to know in time whether the specific service life of the motor belt has reached the time of scrapping. Because the motor belt will become looser and longer after a period of use, at this time, the oil pump motor 20 will be pulled closer and closer to the worm gear reducer 1 and detected by the belt limit sensor 16. The information that the belt is about to be scrapped is sent from the belt limit sensor 16 to the four-information information PLC 19 via the belt adjustment PLC 17, and the specific management unit can know in time whether the motor belt needs to be replaced, which is convenient for management.

[0056] A preferred embodiment: a lead screw connecting nut 8 is fixed in the movable motor support 9, and a lead screw through hole is provided in the fixed motor support 10; the adjusting lead screw 7, the movable motor support 9 and the fixed motor support 10 are all installed in the adjusting support.

[0057] A preferred embodiment: the motor movable support 9 and the motor fixed support 10 are both provided with a pumping unit motor fixing groove 18, which is respectively arranged in the screw connecting nut 8 and the support body on both sides of the screw through hole in the motor movable support 9 and the motor fixed support 10. With the pumping unit motor fixing groove 18, the pumping unit motor 20 can be conveniently adjusted in the radial direction, and various types of pumping unit motors 20 can be fixed in the motor movable support 9 and the motor fixed support 10, expanding the scope of application of the utility model.

[0058] A preferred embodiment: the adjustment support is mainly composed of a rear support 2, a front support 11 and two guide rods 13, the motor movable support 9 and the motor fixed support 10 are sleeved outside the two guide rods 13 through bushings 14 and pressure plates 15, and the two ends of the two guide rods 13 are respectively fixed in the fixing sleeves in the rear support 2 and the front support 11 by bolts; the rear support 2 and the front support 11 are both L-shaped seats, and a fixing sleeve is set in the L-shaped vertical seat, and a support adjustment groove 4 is set in the L-shaped horizontal seat, and the support adjustment groove 4 is a longitudinal groove. The installation position of the adjustment support can be adjusted forward and backward to adapt to the installation environment.

[0059] A preferred embodiment: the bearing fixing nut 3 and the bearing seat 5 are respectively installed and fixed in the vertical seat body of the rear support 2, the bearing fixing nut 3 is installed in the vertical seat body of the rear support 2, and the bearing seat 5 is fixed on the inner side of the vertical seat body; one end of the adjusting screw 7 passes through the thrust bearing 6 installed in the bearing seat 5 and the bearing fixing nut 3 fixed in the rear support 2 and is connected to the output shaft of the worm gear reducer 1.

[0060] A preferred embodiment: the pumping motor fixing groove 18 is arranged in the seat body at the upper part of the motor movable support 9 and the motor fixing support 10, and the seat body part corresponding to the pumping motor fixing groove 18 is a cavity; the groove width of the pumping motor fixing groove 18 is larger than the rod body of the fixing bolt of the pumping motor 20 and smaller than the outer circle formed by the hexagonal head of the fixing bolt. The hexagonal head of the fixing bolt is installed in the cavity below the pumping motor fixing groove 18, and the fixing bolt can move along the groove body of the pumping motor fixing groove 18 but cannot come out of the groove body. The pumping motor 20 is fixed in the motor movable support 9 and the motor fixing support 10 with a nut on the fixing bolt.

[0061] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. An automatic tension adjustment system for an oil pumping unit belt, provided with a motor shifting mechanism, characterized in that: The motor of the oil pumping unit is installed on the movable motor support and the fixed motor support in the motor shifting mechanism; the movable motor support is connected to the adjusting screw driven by the worm gear reducer in the motor shifting mechanism; the detection part of the belt speed sensor is fixed on the large pulley of the oil pumping unit; the motor shifting mechanism is fixed on the oil pumping unit base on one side of the oil pumping unit motor; the belt adjustment PLC is installed in the oil well electric control cabinet, and the belt adjustment PLC is connected to the belt speed sensor, the worm gear reducer and the four-information PLC in the oil well electric control cabinet through cables.

2. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 1, characterized in that: The belt speed sensor is a Hall sensor, and the magnetic piece of the detection part of the Hall sensor is adsorbed on the side of the large pulley connected to the input shaft of the oil pumping unit reduction box.

3. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 2, characterized in that: The receiving part of the Hall sensor is fixed on the reducer box of the oil pumping unit and can receive the information sent by the magnetic piece of the detection part.

4. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 1, characterized in that: One end of the worm gear reducer in the motor shifting mechanism is placed at the rear side of the oil pumping unit motor.

5. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 4, characterized in that: A belt limit sensor is also fixed on the inner side of the worm gear reducer, and the belt limit sensor is connected to the belt adjustment PLC through a cable.

6. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 1, characterized in that: A lead screw connecting nut is fixed in the movable support of the motor, and a lead screw through hole is arranged in the fixed support of the motor; the adjusting lead screw, the movable support of the motor and the fixed support of the motor are all installed in the adjusting support.

7. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 6, characterized in that: The movable motor support and the fixed motor support are both provided with pumping unit motor fixing grooves, which are respectively arranged in the support bodies on both sides of the lead screw connecting nut and the lead screw through hole in the movable motor support and the fixed motor support.

8. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 6, characterized in that: The adjustment support is mainly composed of a rear support, a front support and two guide rods. The movable motor support and the fixed motor support are sleeved on the outside of the two guide rods through bushings and pressure plates. The two ends of the two guide rods are respectively fixed in the fixing sleeves in the rear support and the front support by bolts; the rear support and the front support are both L-shaped seat bodies, and a fixing sleeve is arranged in the L-shaped vertical seat body, and a support adjustment groove is arranged in the L-shaped horizontal seat body, and the support adjustment groove is a longitudinal groove.

9. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 8, characterized in that: The bearing fixing nut and the bearing seat are respectively installed and fixed in the vertical seat body of the rear support. The bearing fixing nut is installed in the vertical seat body of the rear support, and the bearing seat is fixed to the inner side of the vertical seat body; one end of the adjusting screw passes through the thrust bearing installed in the bearing seat and the bearing fixing nut fixed in the rear support and is connected to the output shaft of the worm gear reducer.

10. The automatic tension adjustment system for the oil pumping unit belt as claimed in claim 7, characterized in that: The pumping unit motor fixing groove is arranged in the seat body at the upper part of the motor movable support and the motor fixed support, and the seat body part corresponding to the pumping unit motor fixing groove is a cavity; the groove width of the pumping unit motor fixing groove is larger than the rod body of the pumping unit motor fixing bolt and smaller than the outer circle formed by the hexagonal head of the fixing bolt.

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