Motor belt tightening device for pumping unit base

Abstract

The utility model discloses a motor belt loosening and tightening device for a pumping unit base, which comprises a fixed seat, two sliding rods are fixed on the fixed seat in parallel, a driving sliding seat and a follow-up sliding seat which are arranged front and back are connected between the two sliding rods in a sliding mode, and an adjusting nut is fixed at one end, close to the driving sliding seat, of the fixed seat. An adjusting screw with one end penetrating through the driving sliding seat is arranged in the adjusting nut in a threaded fit mode, a rotating push block and a rotating pull block are fixed outside the front end and the rear end, penetrating through the driving sliding seat, of the adjusting screw respectively, and a self-adaptive spring is connected outside the adjusting screw between the rotating pull block and the driving sliding seat in a sleeved mode. According to the utility model, the belt is loosened or tensioned by the motor on the sliding seat only by rotating the adjusting screw rod, so that the replacement or tightness adjustment of the belt is facilitated, and the operation process is simple and efficient. After the belt is lengthened and loosened after being used for a long time, the compressed self-adaptive spring can push the driving sliding seat to move, self-adaptive tightness adjustment of the belt is achieved, and manual active operation is not needed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the pumping unit power machinery technical field, and specifically relates to motor belt tightness device for pumping unit base. BACKGROUND

[0002] The pumping unit is a kind of machine equipment for exploiting petroleum, commonly known as "kowtow machine".The pumping unit is the most main lifting equipment in rod pumping system, and when working, power is supplied by power machine, high-speed rotation of motor is changed into low-speed rotation of pumping unit crank by speed reducer, and reciprocating motion of pumping unit horse head is changed into rotation by crank-rod-derrick mechanism, and deep well pump is driven to work by suspension rope assembly.Among them, motor and pulley of speed reducer are connected by belt and driven, since motor and speed reducer are fixed equipment on pumping unit base, so when replacing belt or adjusting belt tightness, motor fixed bolt on pumping unit base needs to be loosened, and fixed bolt is fixed again after replacement or adjustment is completed, and the process is complex, time-consuming and laborious, and even mechanical injury occurs. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing motor belt tightness device for pumping unit base, and solves the problem that existing technology needs to remove motor fixed state when replacing belt or adjusting belt tightness.

[0004] The utility model adopts the technical scheme of motor belt tightness device for pumping unit base, including fixed seat, two parallel sliding rods are fixed on the fixed seat, front and rear arranged driving slide base and follow-up slide base are slidably connected between the two sliding rods, the end of the fixed seat close to the driving slide base is fixed with adjusting nut, the adjusting nut is threadedly connected with adjusting screw rod, one end of which passes through the driving slide base, the front and rear ends of the adjusting screw rod passing through the driving slide base are respectively fixed with rotary push block and rotary pull block, and the adjusting screw rod between the rotary pull block and the driving slide base is sleeved with self-adapting spring.

[0005] The utility model is characterized in that,

[0006] The alignment long holes are formed on the driving slide base and the follow-up slide base along the lateral direction.

[0007] The alignment long holes on the driving slide base and the follow-up slide base are parallel and perpendicular to the two sliding rods.

[0008] The two sides of the driving slide base are fixed with sliding sleeves respectively slidably sleeved on the two sliding rods, and the two sides of the follow-up slide base are fixed with sliding sleeves respectively slidably sleeved on the two sliding rods.

[0009] The position of the driving slide base passing through the adjusting screw rod is provided with accommodating hole, and the diameter of the accommodating hole is greater than the outer diameter of the adjusting screw rod, and less than the outer diameter of the self-adapting spring and the rotary push block.

[0010] The adjusting nut is welded and fixed with the fixed seat, the adjusting screw is welded and fixed with the rotating push block, and the adjusting screw is welded and fixed with the rotating pull block.

[0011] The end of the adjusting screw away from the driving slide is a square head, and a crank is matched and connected outside the square head.

[0012] The self-adapting spring is a cylindrical helical compression spring.

[0013] The motor belt tensioning device for the pumping unit base has the advantages that when the belt is replaced or the belt tightness is adjusted, only the adjusting screw needs to be rotated, the rotating push block and the rotating pull block are driven to move forward and backward through the screw transmission principle, and the driving slide is pushed or pulled to move forward and backward, so that the motor on the slide is loosened or the belt is tightened, the belt replacement or the tightness adjustment is facilitated, the operation process is simple and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the motor belt tensioning device for the pumping unit base.

[0015] In the figure, 1 is a fixed seat, 2 is a slide rod, 3 is a driving slide, 4 is a following slide, 5 is an adjusting nut, 6 is an adjusting screw, 7 is a rotating push block, 8 is a rotating pull block, 9 is a self-adapting spring, 10 is an alignment long hole, 11 is a slide sleeve, and 12 is a square head. DETAILED DESCRIPTION

[0016] The utility model will be described in detail in combination with the drawings and specific embodiments.

[0017] Embodiment 1

[0018] The utility model provides a motor belt tensioning device for pumping unit base, such as Figure 1As shown, including fixed seat 1, fixed seat 1 and parallel fixed with two slide bars 2, two slide bars 2 between the common sliding connection with front and rear arrangement of the drive slide 3 and follow-up slide 4, fixed seat 1 near the drive slide 3 one end of the welded with adjusting nut 5, adjusting nut 5 in thread with one end through the drive slide 3 of the adjusting screw 6, drive slide 3 on the corresponding through the adjusting screw 6 position is provided with the accommodating hole with larger diameter than the outer diameter of adjusting screw 6, adjusting screw 6 through the drive slide 3 of the front and rear ends respectively fixed with rotating push block 7 and rotating pull block 8, rotating push block 7 and rotating pull block 8 are welded on the nut outside adjusting screw 6, rotating push block 7 outer diameter is greater than the diameter of accommodating hole, rotating pull block 8 and the adjusting screw 6 between the drive slide 3 is sleeved with the outer diameter of the self-adapting spring 9 greater than the diameter of accommodating hole, self-adapting spring 9 is cylindrical helical compression spring.

[0019] In use, the fixed seat 1 is welded to the front of the reducer pulley of the pumping unit base, the motor output shaft is directed to the side close to the reducer pulley in the left-right direction, the motor is installed after the pulley is aligned with the reducer pulley, the motor pulley and the reducer pulley meet the "four-point-one-line" installation requirements, that is, the two pulleys are located in the same vertical plane, then the installation holes at the front and back ends of the motor are fixed to the driving slide 3 and the driven slide 4 through bolts, the belts are jointly sleeved outside the two pulleys, the adjusting screw 6 is rotated, the screw rod transmission principle of the adjusting nut 5 is combined, and since the diameter of the containing hole is greater than the outer diameter of the adjusting screw 6, the adjusting screw 6 is moved forward from the containing hole while rotating, and since the outer diameter of the self-adaptive spring 9 is greater than the diameter of the containing hole, the adjusting screw 6 drives the rotating push block 8 to rotate and compresses the self-adaptive spring 9 while moving forward, thereby driving the driving slide 3 to move forward between the two slide rods 2, at this time, the motor also moves forward to expand the distance between the two pulleys, so that the belt is tightened, and the driven slide 4 fixed to the motor and serving as a support moves forward between the two slide rods 2 synchronously during the forward movement of the motor, the belt is tightened, and the rotation of the adjusting screw 6 is stopped, and the forward and backward positions of the adjusting screw 6 remain unchanged under the action of the circumferential driving force, so that the belt installation is completed. If the belt needs to be loosened or replaced, the belt needs to be loosened first, then the adjusting screw 6 is rotated in the reverse direction to move backward, and since the outer diameter of the rotating push block 7 is greater than the diameter of the containing hole, the rotating push block 7 is rotated and drives the driving slide 3 to move backward between the two slide rods 2 while the adjusting screw 6 moves backward, at this time, the motor also moves backward to reduce the distance between the two pulleys, so that the belt is loosened, and if the belt needs to be replaced, the loosened belt is removed, and a new belt is jointly sleeved outside the two pulleys, the above installation and tightening operations are performed, and in the above process, lubricating oil can be applied to the rear end of the rotating push block 7 and the front end of the rotating pull block 8 to avoid abrasion of the driving slide 3 or the self-adaptive spring 9 when the two are pushed and pulled. When the belt is used for a long time, it will naturally become longer, but it still has a certain service life, and direct replacement is obviously not economical, at this time, the naturally lengthened belt will become loose, the pressure on both ends of the self-adaptive spring 9 is not enough to make it in the limit compression state, and the forward and backward positions of the adjusting screw 6 are relatively fixed under the condition that it is not subjected to the circumferential force, so the forward and backward positions of the rotating pull block 8 at the rear end of the self-adaptive spring 9 are also relatively fixed, at this time, the self-adaptive spring 9 is elongated to push the driving slide 3 at the front end of the self-adaptive spring 9 to move forward between the two slide rods 2, thereby moving the motor forward to expand the distance between the two pulleys and tighten the belt again, so that the self-adaptive tightness adjustment of the belt is realized.

[0020] Example 2

[0021] The utility model provides a motor belt tightness device for pumping unit base, Figure 1As shown, including fixed seat 1, fixed seat 1 and parallel fixed with two slide bars 2, two slide bars 2 between the common sliding connection with front and rear arrangement of the drive slide 3 and follow-up slide 4, drive slide 3 and follow-up slide 4 on both sides of the long hole 10 are provided, drive slide 3 and follow-up slide 4 on the long hole 10 parallel and perpendicular to two slide bars 2. Fixed seat 1 near the drive slide 3 one end of the welded fixed with adjusting nut 5, adjusting nut 5 in the thread with one end through the drive slide 3 of the adjusting screw 6, drive slide 3 on the corresponding position through the adjusting screw 6 is provided with the accommodating hole of the diameter greater than the outer diameter of the adjusting screw 6, adjusting screw 6 through the drive slide 3 of the front and rear end outside respectively welded with rotating push block 7 and rotating pull block 8, rotating push block 7 outer diameter is greater than the diameter of the accommodating hole, rotating pull block 8 and drive slide 3 between the adjusting screw 6 is provided with the self-adapting spring 9 of the outer diameter greater than the diameter of the accommodating hole, self-adapting spring 9 is cylindrical helical compression spring.

[0022] In use, the fixed seat 1 is welded to the front of the reducer pulley of the oil pumping machine base, the motor output shaft is directed to the side close to the reducer pulley in the left-right direction, the motor is installed after the pulley is aligned with the reducer pulley, the motor pulley and the reducer pulley meet the "four-point-one-line" installation requirements, that is, the two pulleys are in the same vertical plane, then the installation holes at the front and back of the motor are fixed to the aligned long holes 10 on the driving slide 3 and the driven slide 4 through bolts, the motor is moved left and right along the length of the aligned long hole 10 after the bolts are initially tightened to fine-tune, so that the two pulleys are completely aligned, then the belts are collectively sleeved on the outside of the two pulleys, the adjusting screw 6 is turned, combined with the screw rod transmission principle of the adjusting nut 5, and because the diameter of the accommodating hole is greater than the outer diameter of the adjusting screw 6, the adjusting screw 6 is moved forward from the accommodating hole while rotating, and because the outer diameter of the self-adaptive spring 9 is greater than the diameter of the accommodating hole, the adjusting screw 6 drives the rotating pull block 8 to rotate and compresses the self-adaptive spring 9 while moving forward, thereby driving the driving slide 3 to move forward between the two slide rods 2, at this time the motor also moves forward to increase the distance between the two pulleys, so that the belt is tightened, and the driven slide 4 fixed to the motor and serving as a support moves forward between the two slide rods 2 synchronously during the forward movement of the motor, the belt is tightened and the adjusting screw 6 is stopped rotating, the position of the adjusting screw 6 remains unchanged without the action of the circumferential driving force, thereby completing the installation of the belt. If the belt needs to be loosened or replaced, the belt needs to be loosened first, then the adjusting screw 6 is rotated in the opposite direction to move it backward, and because the outer diameter of the rotating push block 7 is greater than the diameter of the accommodating hole, the rotating push block 7 is rotated and drives the driving slide 3 to move backward between the two slide rods 2 while the adjusting screw 6 moves backward, at this time the motor also moves backward to reduce the distance between the two pulleys, so that the belt is loosened, if the belt needs to be replaced, the loosened belt is removed, and a new belt is collectively sleeved on the outside of the two pulleys, the above installation and tightening operations are performed, and during the above process, lubricating oil can be applied to the rear end of the rotating push block 7 and the front end of the rotating pull block 8 to prevent the driving slide 3 or the self-adaptive spring 9 from being worn when the two are pushed and pulled. When the belt is used for a long time, it will naturally become longer, but it still has a certain service life, directly replacing it is obviously not economical, at this time the naturally lengthened belt will become loose, after being loosened the pressure on both ends of the self-adaptive spring 9 is not enough to keep it in the limit compression state, and the position of the adjusting screw 6 is relatively fixed in the forward and backward direction without the action of the circumferential force, then the position of the rotating pull block 8 at the rear end of the self-adaptive spring 9 is also relatively fixed, at this time the self-adaptive spring 9 is elongated to push the driving slide 3 at the front end of the self-adaptive spring 9 to move forward between the two slide rods 2, thereby moving the motor forward to again increase the distance between the two pulleys and tighten the belt, realizing self-adaptive tightness adjustment of the belt.

[0023] Example 3

[0024] The utility model provides a motor belt tightness device for pumping unit base, like Figure 1 As shown in the figure, it comprises a fixed seat 1, two slide rods 2 are fixed side by side on the fixed seat 1, a front and rear arranged driving slide base 3 and a follow-up slide base 4 are connected by common sliding between the two slide rods 2, the two sides of the driving slide base 3 are fixed with slide sleeves 11 respectively slidingly sleeved on the outside of the two slide rods 2, and the two sides of the follow-up slide base 4 are fixed with slide sleeves 11 respectively slidingly sleeved on the outside of the two slide rods 2. An adjusting nut 5 is welded and fixed on one end of the fixed seat 1 close to the driving slide base 3, an adjusting screw rod 6 is threadedly matched in the adjusting nut 5 with one end penetrating through the driving slide base 3, a containing hole with a diameter larger than the outer diameter of the adjusting screw rod 6 is formed on the driving slide base 3 corresponding to the position penetrating through the adjusting screw rod 6, and a rotating push block 7 and a rotating pull block 8 are respectively welded and fixed on the outside of the front and rear ends of the driving slide base 3 penetrating through the adjusting screw rod 6, the outer diameter of the rotating push block 7 is larger than the diameter of the containing hole, the adjusting screw rod 6 between the rotating pull block 8 and the driving slide base 3 is externally sleeved with a self-adapting spring 9 with an outer diameter larger than the diameter of the containing hole, and the self-adapting spring 9 is a cylindrical helical compression spring.

[0025] In use, the fixed seat 1 is welded to the front of the reducer pulley of the oil pumping machine base, the motor output shaft is directed to the side close to the reducer pulley, the motor is installed after the pulley is aligned with the reducer pulley, the motor pulley and the reducer pulley meet the "four-point-one-line" installation requirements, that is, the two pulleys are in the same vertical plane, then the installation holes at the front and rear ends of the motor are fixed to the driving slide 3 and the driven slide 4 through bolts, and the belts are jointly sleeved outside the two pulleys. The adjusting screw 6 is rotated, combined with the screw rod transmission principle of the adjusting nut 5, and because the diameter of the accommodating hole is greater than the outer diameter of the adjusting screw 6, the adjusting screw 6 is moved forward from the accommodating hole while rotating, and because the outer diameter of the self-adaptive spring 9 is greater than the diameter of the accommodating hole, the adjusting screw 6 drives the rotating pull block 8 to rotate and compresses the self-adaptive spring 9 while moving forward, thereby driving the driving slide 3 to move forward between the two slide rods 2. At this time, the motor also moves forward to stretch the distance between the two pulleys, so that the belt is taut. The driven slide 4 fixed with the motor and serving as a support moves forward synchronously between the two slide rods 2 during the forward movement of the motor. After the belt is taut, the adjusting screw 6 is stopped from rotating, and the position of the adjusting screw 6 remains unchanged under the action of the circumferential driving force, thereby completing the installation of the belt. If the belt needs to be loosened or replaced, the belt needs to be loosened first, then the adjusting screw 6 is rotated in the opposite direction to move it backward, and because the outer diameter of the rotating push block 7 is greater than the diameter of the accommodating hole, the rotating push block 7 is rotated and drives the driving slide 3 to move backward between the two slide rods 2 while the adjusting screw 6 moves backward. At this time, the motor also moves backward to reduce the distance between the two pulleys, so that the belt is loosened. If the belt needs to be replaced, the loosened belt is removed, and a new belt is jointly sleeved outside the two pulleys. The above installation and tightening operations are performed. In the above process, lubricating oil can be applied to the rear end of the rotating push block 7 and the front end of the rotating pull block 8 to prevent the driving slide 3 or the self-adaptive spring 9 from being worn when the two are pushed and pulled. After the belt is used for a long time, it will naturally become longer, but it still has a certain service life. Direct replacement is obviously not economical. At this time, the naturally lengthened belt will become loose. After loosening, the pressure on both ends of the self-adaptive spring 9 is not enough to keep it in the state of extreme compression. The position of the adjusting screw 6 remains relatively fixed in the absence of circumferential force, and the position of the rotating pull block 8 at the rear end of the self-adaptive spring 9 also remains relatively fixed. At this time, the self-adaptive spring 9 is stretched to push the driving slide 3 at the front end of the self-adaptive spring 9 to move forward between the two slide rods 2, thereby moving the motor forward to again stretch the distance between the two pulleys and tighten the belt, achieving self-adaptive tightness adjustment of the belt. In the above process, when the driving slide 3 and the driven slide 4 move between the two slide rods 2, the sliding sleeves 11 fixed on both sides of the driving slide 3 and the driven slide 4 are completely sleeved on the slide rods 2 to prevent them from falling out of the slide when the force is large, improve the operation reliability, and apply lubricating oil in the sliding sleeves 11 to improve the operation stability.

[0026] Example 4

[0027] This utility model provides a motor belt tensioning device for the base of an oil pumping unit, such as... Figure 1 As shown, the system includes a fixed base 1, on which two sliding rods 2 are fixed side by side. A driving slide 3 and a following slide 4, arranged front to back, are slidably connected between the two sliding rods 2. An adjusting nut 5 is welded to the end of the fixed base 1 closest to the driving slide 3. An adjusting screw 6, one end of which passes through the driving slide 3, is threaded into the adjusting nut 5. The end of the adjusting screw 6 furthest from the driving slide 3 is a square clamp 12, which is fitted with a crank handle. A receiving hole with a diameter larger than the outer diameter of the adjusting screw 6 is provided on the driving slide 3 corresponding to the position where the adjusting screw 6 passes through. A rotating push block 7 and a rotating pull block 8 are welded to the front and rear ends of the adjusting screw 6, respectively. The outer diameter of the rotating push block 7 is larger than the diameter of the receiving hole. An adaptive spring 9, with an outer diameter larger than the diameter of the receiving hole, is sleeved on the adjusting screw 6 between the rotating pull block 8 and the driving slide 3. The adaptive spring 9 is a cylindrical helical compression spring.

[0028] In use, the fixed seat 1 is welded to the front of the reducer pulley of the oil pumping machine base, the motor output shaft is directed to the side close to the reducer pulley in the left-right direction, the motor is installed after the pulley is aligned with the reducer pulley, the motor pulley and the reducer pulley meet the "four-point-one-line" installation requirements, that is, the two pulleys are in the same vertical plane, then the installation holes at the front and back of the motor are fixed to the driving slide 3 and the driven slide 4 through bolts, and then the belts are collectively sleeved outside the two pulleys, then the installation slot of the crank is clamped on the square clamp head 12 at the front end of the adjusting screw 6, the adjusting screw 6 is rotated by the crank, the operation convenience is improved, the screw rod transmission principle of the adjusting nut 5 is combined, and since the diameter of the containing hole is greater than the outer diameter of the adjusting screw 6, the adjusting screw 6 rotates while moving forward from the containing hole, and since the outer diameter of the self-adaptive spring 9 is greater than the diameter of the containing hole, the adjusting screw 6 moves forward while driving the rotating pull block 8 to rotate and compressing the self-adaptive spring 9, thereby driving the driving slide 3 to move forward between the two slide rods 2, at this time the motor also moves forward to increase the distance between the two pulleys, so that the belt is tightened, and the driven slide 4 fixed to the motor and serving as a support moves forward between the two slide rods 2 synchronously during the forward movement of the motor, and the belt is tightened, and the belt is tightened. Stop rotating the adjusting screw 6, the position of the adjusting screw 6 remains unchanged under the action of the circumferential driving force, thereby completing the installation of the belt. If the belt needs to be loosened or replaced, the belt needs to be loosened first, then the adjusting screw 6 is rotated in the opposite direction by the crank to move it backward, and since the outer diameter of the rotating push block 7 is greater than the diameter of the containing hole, the adjusting screw 6 moves backward while driving the rotating push block 7 to rotate and moving the driving slide 3 backward between the two slide rods 2, at this time the motor also moves backward to reduce the distance between the two pulleys, so that the belt is loosened, and if the belt needs to be replaced, the loosened belt is removed, and a new belt is collectively sleeved outside the two pulleys, the above installation and tightening operations are performed, and in the above process, lubricating oil can be applied to the rear end of the rotating push block 7 and the front end of the rotating pull block 8 to prevent the driving slide 3 or the self-adaptive spring 9 from being worn when the two are pushed and pulled. When the belt is used for a long time, it will naturally become longer, but it still has a certain service life, and direct replacement is obviously not economical, at this time the naturally lengthened belt will become loose, the pressure on both ends of the self-adaptive spring 9 is not enough to keep it in the limit compression state, and the position of the adjusting screw 6 is relatively fixed in the forward and backward directions without the circumferential force, so the position of the rotating pull block 8 at the rear end of the self-adaptive spring 9 is also relatively fixed, at this time the self-adaptive spring 9 is elongated to push the driving slide 3 at the front end of the self-adaptive spring 9 to move forward between the two slide rods 2, thereby moving the motor forward to increase the distance between the two pulleys and tighten the belt, thereby achieving self-adaptive tightness adjustment of the belt.

[0029] Example 5

[0030] The utility model provides a motor belt tightness device for pumping unit base, can inverting the whole device of embodiment 1~4 before and after, namely fixed seat 1 before and after inverting and welding to the front of the speed reducer pulley on pumping unit base, need simultaneously the position of self -adaptation spring 9 is switched to the rotation push block 7 and the active slide 3 between the rotation pull block 8 and the active slide 3 between, the rest design remains unchanged, when operating, rotation push block 7 pushes the active slide 3 and moves forward and tightens the belt, and rotation pull block 8 pulls the active slide 3 and moves backward and loosens the belt. At this time, when adjusting the tightness of the belt, operation needs to be carried out on the rear of the device, that is, on the end of the speed reducer close to the pumping unit base, the operation space is limited, and the convenience of manual active operation is less than that of embodiment 1~4, but the self -adaptation tightness adjustment of self -adaptation spring 9 is not affected.

[0031] Embodiment 6

[0032] The utility model provides a motor belt tightness device for pumping unit base, can weld fixed seat 1 in embodiment 1~4 to the front of the speed reducer pulley on pumping unit base but not the front, namely the front close to the speed reducer pulley one side outside, motor and speed reducer left and right stagger, but motor output shaft is towards the side of speed reducer, after motor installation pulley, two pulleys are opposite and located in same vertical plane, namely can, make motor pulley and speed reducer pulley reach " four point one line " installation requirement. This installation mode can satisfy the belt tightness adjustment demand similarly, but the width size requirement of pumping unit base is higher.

Claims

1. A motor belt tensioning device for a pumping unit base, characterized in that, The utility model relates to a kind of self-adapting slide rail, including fixed seat (1), two parallel slide bars (2) are fixed on fixed seat (1), and common slidingly connected with front and rear arrangement driving slide (3) and follow-up slide (4) between two slide bars (2), the both sides of driving slide (3) are fixed with the slide sleeve (11) of respectively sliding sleeve connection in two slide bars (2) outside, the both sides of follow-up slide (4) are fixed with the slide sleeve (11) of respectively sliding sleeve connection in two slide bars (2) outside, fixed seat (1) is fixed with adjusting nut (5) close to the one end of driving slide (3), adjusting nut (5) is screwed with the adjusting screw rod (6) of one end through driving slide (3), adjusting screw rod (6) is fixed with rotating push block (7) and rotating pull block (8) respectively outside the front and rear ends of driving slide (3) through, adjusting nut (5) and fixed seat (1), adjusting screw rod (6) and rotating push block (7), adjusting screw rod (6) and rotating pull block (8) are all welded fixed, and self-adapting spring (9) is sleeved on the adjusting screw rod (6) between rotating pull block (8) and driving slide (3) outside.

2. The motor belt tensioner for a pumping unit pedestal of claim 1, wherein, The driving slide (3) and follow-up slide (4) are provided with alignment long holes (10) along the lateral direction.

3. The motor belt tensioner for a pumping unit pedestal of claim 2, wherein, The alignment long holes (10) on the driving slide (3) and follow-up slide (4) are parallel and perpendicular to the two slide bars (2).

4. The motor belt tensioner for a pumping unit pedestal of claim 1 wherein, The position of driving slide (3) through adjusting screw rod (6) is provided with accommodating hole, and the diameter of accommodating hole is greater than the outer diameter of adjusting screw rod (6), and less than the outer diameter of self-adapting spring (9) and the outer diameter of rotating push block (7).

5. The motor belt tensioner for a pumping unit pedestal of claim 1 wherein, The end of adjusting screw rod (6) away from driving slide (3) is square chuck (12), and ratchet wrench is matched with square chuck (12) outside.

6. The motor belt tensioner for a pumping unit pedestal of claim 1 wherein, The self-adapting spring (9) is cylindrical helical compression spring.

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