CN114542018A - Heavy load speed reduction driving system and pumping unit using same - Google Patents

Abstract

The invention relates to a heavy load deceleration driving system and an oil pumping unit using the same, wherein the heavy load deceleration driving system is a transmission system which is composed of a first-stage deceleration formed by meshing a self-lubricating nylon gear of a motor output shaft and a self-lubricating nylon gearwheel, and a second-stage deceleration formed by meshing a forged steel pinion on a transmission shaft and a forged steel gear ring embedded in a driving wheel assembly, and the combined transmission system best meets the use condition requirements of oil well lifting equipment requiring large load and large torque. The tower type pumping unit has the advantages of simple structure, low noise, lower cost than a direct-drive pumping unit, firmness and durability than a conventional pumping unit, wind load resistance and lower maintenance cost.

Description

Heavy-duty deceleration drive system and pumping unit using the deceleration drive system

technical field

The invention relates to a mechanical oil extraction equipment in the petroleum industry, in particular to a combined transmission system of a tower pumping unit.

Background technique

At present, tower pumping units are widely used because of their advantages of energy saving, high efficiency, high intelligence, and prolonging the service life of sucker rods and oil pumps, but they also have disadvantages: the transmission system adopts a reducer Reduced transmission, short life and large maintenance. Specifically, the tower pumping unit adopts a combined transmission system, that is, a transmission structure with a first-stage gear reduction plus a first-stage V-belt and a synchronous belt reduction. Among them, the V-belt is a wearing part, and the V-belt needs to be adjusted frequently during use. The tension level can maintain the normal operation of the tower pumping unit; the medium-sized tower pumping unit adopts imported synchronous belt, which has high cost, long procurement cycle, and needs to be replaced regularly; the speed of the primary gear of the large tower pumping unit is limited to Within 160 rpm, the manufacturing cost of the motor is increased; the reduction ratio i of the two pairs of steel gear transmission systems is 35 to 42, and the speed of the first stage gear is 600 rpm, which exceeds the maximum speed of 250 rpm for oil lubrication. The effect noise is large, the gearbox is difficult to seal, and the maintenance cost is increased. The existence of the above problems restricts the production and promotion of heavy-duty tower pumping units. Therefore, it is necessary to use other materials to solve the problem of primary gear reduction based on the successful experience of the original combined transmission system and the characteristics of the natural environment to meet the needs of the market.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a heavy-load deceleration drive system with simple structure, low noise, lower cost than a direct-drive pumping unit, firmness and durability, wind resistance, and lower maintenance cost than a conventional pumping unit, and its use This geared drive system is a tower pumping unit.

The heavy-load deceleration drive system of the present invention includes a motor, an output shaft of the motor, a transmission shaft, a drive wheel assembly installed in a gear box of the drive wheel assembly, a drive wheel assembly shaft, and a combined transmission bracket. Sucker rod hanging rope fixing holes and counterweight hanging rope fixing holes are respectively opened at both ends, and both ends of the drive wheel assembly shaft are installed on the combined transmission bracket through a pair of bearings, and also include self-lubricating nylon pinion, self-lubricating nylon Large gear, steel sleeve, tensioning sleeve, forged steel pinion, forged steel large ring gear, also including sucker rod sling, counterweight sling, the self-lubricating nylon pinion is mounted on the output shaft of the motor through the tensioning sleeve. At the end, the steel sleeve is embedded in the inner hole of the self-lubricating nylon pinion. The transmission shaft is supported and fixed on the combined transmission bracket through a pair of bearings. The self-lubricating nylon pinion meshes with the self-lubricating nylon large gear. The lubricating nylon large gear is fixedly installed on one end of the transmission shaft, the forged steel pinion is fixed on the other end of the transmission shaft, and the forged steel large ring gear is mounted on the drive wheel assembly and meshes with the forged steel pinion, There are 6-8 left-handed rope grooves and 6-8 right-handed rope grooves on both sides of the upper outer circle center of the driving wheel assembly, and the sucker rod hanging rope and the counterweight hanging rope are respectively fixed on the driving wheel assembly. In this case, the sucker-rod sling and the counterweight sling are wound on the drive wheel assembly in opposite directions, and the sucker-rod sling and the counterweight sling share the left-hand rope groove and the right-hand rope groove on the drive wheel assembly .

The heavy-load deceleration drive system of the present invention includes a motor, a motor output shaft, a drive wheel assembly, a drive wheel assembly shaft, and a combined transmission bracket. Both ends of the drive wheel assembly are respectively provided with a sucker rod suspending rope fixing hole and The fixing hole of the counterweight hanging rope, the two ends of the drive wheel assembly shaft are installed on the combined transmission bracket through a pair of bearings, and also includes self-lubricating nylon pinion, self-lubricating nylon large ring gear, and also includes sucker rod hanging rope, Heavy sling, the self-lubricating nylon pinion is sleeved on the end of the motor output shaft by tensioning, the inner hole of the self-lubricating nylon pinion is inlaid with a steel sleeve, and the self-lubricating nylon ring gear is fixed on the drive through a positioning pin. On the wheel assembly, the self-lubricating nylon pinion meshes with the self-lubricating nylon large ring gear, and there are 6-8 left-handed rope grooves and 6-8 right-handed rope grooves on both sides of the outer circle center of the driving wheel assembly. Rope groove, the sucker rod suspension rope and the counterweight suspension rope are respectively fixed on the drive wheel assembly, the sucker rod suspension rope and the counterweight suspension rope are wound on the drive wheel assembly in opposite directions, the sucker rod suspension rope The rope and the counterweight hanging rope share the left-hand rope groove and the right-hand rope groove on the drive wheel assembly.

The heavy-load deceleration drive system of the present invention, wherein the sucker rod suspension rope is divided into a left-handed sucker rod suspension rope and a right-handed sucker rod suspension rope, and the left-handed sucker rod suspension rope and the right-handed sucker rod suspension rope bypass the The left-handed rope groove and the right-handed rope groove on one side of the drive wheel assembly are fixed on the fixing hole of the sucker rod hanging rope. The counterweight hanging rope is divided into a left-handed counterweight hanging rope and a right-handed counterweight hanging rope. The heavy lifting rope and the left-handed counterweight hanging rope go around the right-handed rope groove and the left-handed rope groove on the other side of the driving wheel assembly and are fixed on the fixing hole of the counterweight hanging rope.

The heavy-load deceleration drive system of the present invention, wherein the motor output shaft is a tapered shaft, and the tapered shaft is connected with a tapered steel sleeve in the self-lubricating nylon pinion.

The heavy-load deceleration drive system of the present invention, wherein the rated torque of the motor is below 3000nm, and the rated rotational speed is within 160-600rpm.

The pumping unit of the present invention uses the above-mentioned heavy-load deceleration drive system. The configuration of the left-handed rope groove and the right-handed rope groove on the drive wheel assembly is set according to the stroke of the tower pumping unit. The left-handed rope groove and the right-handed rope groove The stroke that can be achieved when the rope grooves are 6 grooves is 1.7 times the circumference of the driving wheel, and the stroke that can be achieved when the left-hand rope grooves and the right-hand rope grooves are 8 grooves is 2.7 times the circumference of the driving wheel.

The large-scale tower pumping unit of the 2-stage deceleration heavy-load deceleration drive system of the present invention (the maximum suspended point load of the pumping unit is more than 160kn) is a first-stage gear deceleration and a first-stage self-lubricating nylon gear deceleration, wherein the motor adopts asynchronous Servo motor, rated power of 7.5 to 90kw, rated speed of 300-600 rpm, rated torque of 200-3000N m, transmission system reduction ratio i is 35 to 42.

The medium-sized tower pumping unit of the first-stage deceleration heavy-load deceleration drive system of the present invention (the maximum suspended point load of the pumping unit is less than 140kn) is a first-stage self-lubricating nylon gear deceleration, wherein the motor adopts a permanent magnet synchronous motor with a rated The power is 10 to 75kw, the rated speed is 80-160 rpm, the rated torque is 900-3000N m, and the reduction ratio i of the transmission system is within 8.

The difference between the present invention and the prior art is that the first-stage deceleration of the combined transmission system of the tower pumping unit of the present invention uses a deceleration mechanism composed of a self-lubricating nylon pinion and a second-stage steel gear, and the total speed ratio i is 35 To 42, the speed control range is within 1000rpm, and the rated torque is controlled within 3000N m, which meets the use conditions of self-lubricating nylon gears, and the forged steel driving gear speed is within 160 rpm, which also meets the conditions of oil-dipping lubrication, and the noise is reduced. At the lowest level, the respective advantages of self-lubricating nylon gears and steel gears are brought into play, and the effect of promoting strengths and avoiding weaknesses is achieved. The present invention has simple structure, low noise, reduced motor manufacturing cost and lower maintenance cost.

The heavy-load deceleration drive system of the present invention and the oil pumping unit using the deceleration drive system of the present invention will be further described below with reference to the accompanying drawings.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of the present invention;

Fig. 2 is a sectional view along A-A in Fig. 1;

3 is a front view of Embodiment 2 of the present invention;

Fig. 4 is a sectional view along B-B in Fig. 3;

Fig. 5 is the structural representation of self-lubricating nylon pinion in the present invention;

FIG. 6 is a cross-sectional view taken along C-C in FIG. 5 .

Detailed ways

Example 1

The pumping unit in Example 1 includes a heavy-duty deceleration drive system with two-stage deceleration. As shown in Figures 1, 2, 5, and 6, the heavy-load deceleration drive system includes a motor 1, a motor output shaft 2, a transmission shaft 7, a The drive wheel assembly 10 , the drive wheel assembly shaft 11 , and the combined transmission bracket 12 in the drive wheel assembly gear box 13 . The two ends of the drive wheel assembly 10 are respectively provided with sucker rod suspending rope fixing holes 16 and counterweights. Hanging rope fixing hole 17, both ends of the drive wheel assembly shaft 11 are mounted on the combined transmission bracket 12 through a pair of bearings, and also includes self-lubricating nylon pinion 3, self-lubricating nylon large gear 4, steel sleeve 5, tensioning sleeve 6. Forged steel pinion 8, forged steel large ring gear 9, sucker rod sling 14 and counterweight sling 15, self-lubricating nylon pinion 3 is mounted on the end of motor output shaft 2 through tensioning sleeve 6, steel The sleeve 5 is embedded in the inner hole of the self-lubricating nylon pinion 3, the transmission shaft 7 is supported and fixed on the combined transmission bracket 12 by a pair of bearings, the self-lubricating nylon pinion 3 is meshed with the self-lubricating nylon large gear 4, and the self-lubricating nylon large gear 4 is fixedly installed at one end of the transmission shaft 7, the forged steel pinion 8 is fixed at the other end of the transmission shaft 7, the forged steel large ring gear 9 is installed on the driving wheel assembly 10 and meshes with the forged steel pinion 8, the sucker rod The suspending rope 14 and the counterweight suspending rope 15 are respectively fixed on the driving wheel assembly 10, the sucker rod suspending rope 14 and the counterweight suspending rope 15 are wound on the driving wheel assembly 10 in opposite directions, and the sucker rod suspending rope 14 and the The heavy lifting rope 15 shares the rope groove on the driving wheel assembly 10 .

There are 6-8 left-handed rope grooves and 6-8 right-handed rope grooves on both sides of the center of the upper outer circle of the driving wheel assembly 10. The sucker rod suspending rope 14 is divided into left-handed sucker rod suspending rope and right-handed oil sucking. Rod hanging rope, left-handed sucker rod hanging rope and right-handed sucker rod hanging rope bypass the left-handed rope groove 19 and right-handed rope groove 20 on one side of the drive wheel assembly 10 and are fixed on the sucker rod hanging rope fixing hole 16 , the counterweight hanging rope 15 is divided into a left-handed counterweight hanging rope and a right-handed counterweight hanging rope, and the right-handed counterweight hanging rope and the left-handed counterweight hanging rope bypass the right-handed rope groove 20 and The left-handed rope groove 19 is fixed on the fixing hole 17 of the counterweight hanging rope.

As shown in FIG. 6 , the motor output shaft 2 is a tapered shaft, and the tapered shaft is connected with the tapered steel sleeve 5 in the self-lubricating nylon pinion 3 .

Among them, the motor 1 adopts an asynchronous servo motor, the rated power is 5.5 to 90kw, the rated speed is 300-600rpm, the rated torque is 200-3000N m, the reduction ratio i of the transmission system is 35 to 42, and the driving torque of the driving wheel is 12000-166000N. m. .

The configuration of the left-handed rope groove 19 and the right-handed rope groove 20 on the driving wheel assembly 10 is set according to the stroke of the tower pumping unit, which can be realized when the left-handed rope groove 19 and the right-handed rope groove 20 are respectively 6 grooves. The stroke is 1.7 times the circumference of the driving wheel. When the left-hand rope groove 19 and the right-hand rope groove 20 are respectively 8 grooves, the stroke that can be achieved is 2.7 times the circumference of the driving wheel. The diameter and circumference are 3.77 meters, and 8 left-handed rope grooves 19 and 8 right-handed rope grooves 20 (see Figure 2) are arranged, which can meet the requirements of the tower pumping unit with a stroke of 10 meters.

This embodiment 1 adopts a two-stage reduction mechanism, including a pair of self-lubricating nylon gears in one stage and a pair of forged steel gears in one stage. The total speed ratio i of the present invention is 35 to 42, the speed control range is within 1000rpm, and the rated torque is controlled within 3000N m, which satisfies the use conditions of self-lubricating nylon gears. To the requirements of the second-stage reduction gear, steel gears are used, and the pinion speed is within 160 rpm, which also meets the conditions of oil-dipping lubrication, and the noise is reduced to a minimum, that is, a pair of self-lubricating nylon gears and a pair of forged steel gears are combined. , the advantages of self-lubricating nylon gears and steel gears are brought into play, and the effect of promoting strengths and avoiding weaknesses is achieved. The structure is simple and the noise is low, which reduces the manufacturing cost of the motor and also reduces the maintenance cost. In the two-stage gear in the prior art, the steel gear only meets the condition of oil-dipping lubrication because the pinion speed is 250 rpm, the total speed ratio i is 19 to 23, and the rated torque of the motor is increased by 1.75 times (compared with this embodiment). Compared with 1), the motor cost of the combined transmission system is increased, and the superposition effect of the two-stage steel gear transmission is noisy, which is difficult to meet the requirements of environmental protection.

Example 2

The pumping unit of the second embodiment includes a heavy-load deceleration drive system with 1-stage deceleration. As shown in Figure 3-6, the heavy-load deceleration drive system includes a permanent magnet synchronous motor 1', a motor output shaft 2', and a drive wheel assembly 10. ', the drive wheel assembly shaft 11', the combined transmission bracket 12', the two ends of the drive wheel assembly 10' are respectively provided with a sucker rod hanging rope fixing hole 16' and a counterweight hanging rope fixing hole 17'. Both ends of the shaft 11' are mounted on the combined transmission bracket 12' through a pair of bearings, and also include a self-lubricating nylon pinion 3', a self-lubricating nylon large ring gear 4', a sucker rod sling and a counterweight sling, The self-lubricating nylon pinion 3' is mounted on the end of the motor output shaft 2' through the tensioning sleeve 6', the inner hole of the self-lubricating nylon pinion 3' is inlaid with a steel sleeve 5', and the self-lubricating nylon large ring gear 4' passes through The positioning pin 18' is fixed on the driving wheel assembly 10', the self-lubricating nylon pinion 3' is engaged with the self-lubricating nylon large gear 4', and the outer circle center of the driving wheel assembly 10' is provided with 6-8 A left-handed rope groove 19' and 6-8 right-handed rope grooves 20', the sucker rod suspension rope and the counterweight suspension rope are respectively fixed on the drive wheel assembly 10', the sucker rod suspension rope and the counterweight suspension rope are reversed The direction is wound on the driving wheel assembly 10', and the sucker rod suspending rope and the counterweight suspending rope share the left-handed rope groove 19' and the right-handed rope groove 20' on the driving wheel assembly 10'.

Among them, the sucker rod suspension rope is divided into left-handed sucker rod suspension rope and right-handed sucker-rod suspension rope. The rope groove 19' and the right-handed rope groove 20' are fixed on the sucker rod hanging rope fixing hole 16'. The counterweight hanging rope is divided into left-handed counterweight hanging rope and right-handed counterweight hanging rope. Right-handed counterweight hanging rope The left-handed counterweight suspension rope bypasses the right-handed rope groove 20' and the left-handed rope groove 19' on the other side of the driving wheel assembly 10' and is fixed on the counterweight suspension rope fixing hole 17'.

In this embodiment, the motor output shaft 2' is a tapered shaft, and the tapered shaft is connected to the tapered steel sleeve in the self-lubricating nylon pinion 3'.

Among them, the rated torque of the motor 1' is below 3000N·m, the rated speed is within 160rpm, and the driving torque of the driving wheel is 9600-40000N·m.

The configuration of the left-handed rope groove and the right-handed rope groove on the drive wheel assembly 10' is set according to the stroke of the tower pumping unit, which can be realized when the left-handed rope groove 19' and the right-handed rope groove 20' are respectively 6 grooves. The stroke is 1.7 times the circumference of the driving wheel. When the left-hand rope groove 19' and the right-hand rope groove 20' are 8 grooves respectively, the stroke that can be achieved is 2.7 times the circumference of the driving wheel. It has a 10' outer diameter and a circumference of 4.71 meters, and is provided with 6 left-handed rope grooves 19' and 6 right-handed rope grooves 20' (see Figure 4), which can meet the 8-meter stroke requirement of the tower pumping unit.

The difference between the second embodiment and the first embodiment is that the number of stages of the deceleration mechanism is different, but nylon gears are used in the deceleration mechanism, and the concept is the same.

In this embodiment, the first-level self-lubricating nylon ring gear is used to mesh with the self-lubricating nylon pinion of the motor output shaft, the speed ratio is below 1:8, and the speed control range is within 160rpm, which meets the use conditions of the self-lubricating nylon gear; The self-lubricating nylon ring gear is provided with 8-16 connecting holes, and the inner edge of the ring gear is in transition fit with the outer edge of the steel sleeve, and the self-lubricating nylon ring gear is fixed on the connecting plate of the drive wheel assembly by tight fitting with positioning pins (this connection The plate can be made of nylon plate), there is no need for a fully enclosed gear box, no need to add or replace lubricating oil, and the maintenance cost is greatly reduced.

The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various Variations and improvements should fall within the protection scope determined by the claims of the present invention.

Claims (10)

1. A heavy-load deceleration drive system, comprising a motor (1), a motor output shaft (2), a transmission shaft (7), a drive wheel assembly (10) mounted in a drive wheel assembly gearbox (13), The drive wheel assembly shaft (11) and the combined transmission bracket (12), the two ends of the drive wheel assembly (10) are respectively provided with a sucker rod hanging rope fixing hole (16) and a counterweight hanging rope fixing hole (17) ), both ends of the drive wheel assembly shaft (11) are mounted on the combined transmission bracket (12) through a pair of bearings, characterized in that it also includes a self-lubricating nylon pinion (3) and a self-lubricating nylon large gear (4) , steel sleeve (5), tightening sleeve (6), forged steel pinion (8), forged steel large ring gear (9), also including sucker rod sling (14), counterweight sling (15), The self-lubricating nylon pinion (3) is mounted on the end of the motor output shaft (2) through a tensioning sleeve (6), and the steel sleeve (5) is embedded in the inner hole of the self-lubricating nylon pinion (3), The transmission shaft (7) is supported and fixed on the combined transmission bracket (12) by a pair of bearings, the self-lubricating nylon pinion (3) is meshed with the self-lubricating nylon large gear (4), and the self-lubricating nylon large gear (4) ) is fixedly installed at one end of the transmission shaft (7), the forged steel pinion (8) is fixed at the other end of the transmission shaft (7), and the forged steel large ring gear (9) is installed in the drive wheel assembly (10). ) and meshes with the forged steel pinion (8), the drive wheel assembly (10) is provided with 6-8 left-handed rope grooves and 6-8 right-handed rope grooves on both sides of the upper outer circle center, The sucker rod suspension rope (14) and the counterweight suspension rope (15) are wound on the drive wheel assembly (10) in opposite directions, and the sucker rod suspension rope (14) and the counterweight suspension rope (15) share the drive wheel Left-hand rope groove and right-hand rope groove on the assembly (10). 2. The heavy-load deceleration drive system according to claim 1, characterized in that: the sucker rod suspension rope (14) is divided into a left-handed sucker rod suspension rope and a right-handed sucker rod suspension rope, and a left-handed sucker rod suspension rope The suspension rope and the right-handed sucker rod suspension rope bypass the left-handed rope groove and the right-handed rope groove on one side of the driving wheel assembly (10) and are fixed on the sucker rod suspension rope fixing hole (16). The rope (15) is divided into a left-handed counterweight hanging rope and a right-handed counterweight hanging rope. The rope groove is fixed on the fixing hole (17) of the counterweight hanging rope. 3. The heavy-load deceleration drive system according to claim 2 is characterized in that: the heavy-load deceleration drive system is suitable for a large-scale tower pumping unit with a maximum suspension load of more than 160 kn, and the total reduction ratio i of the transmission system is 35 to 42. The motor (1) adopts an asynchronous servo motor, the rated power is 5.5 to 90kw, the rated speed is 300-600rpm, and the self-lubricating nylon pinion (3) outputs a rated torque of 200-3000N m. ) is transmitted to the forged steel pinion (8) with a torque of 1200-21000N·m, and the forged steel large ring gear (9) drives the drag torque on the driving wheel to be 12000-166000N·m. 4. The heavy-duty deceleration drive system according to any one of claims 1-3, the motor output shaft (2) is a tapered shaft, the tapered shaft and the self-lubricating nylon pinion (3) in the tapered steel Set of (5) connections. 5. A heavy-load deceleration drive system, comprising a motor (1'), a motor output shaft (2'), a drive wheel assembly (10'), a drive wheel assembly shaft (11'), and a combined transmission bracket (12') ), the two ends of the driving wheel assembly (10') are respectively provided with a sucker rod suspending rope fixing hole (16') and a counterweight suspending rope fixing hole (17'), and the driving wheel assembly shaft (11') The two ends are mounted on the combined transmission bracket (12') through a pair of bearings, and it is characterized in that it also includes a self-lubricating nylon pinion (3'), a self-lubricating nylon large ring gear (4'), and a sucker rod. Suspension rope and counterweight suspension rope, the self-lubricating nylon pinion (3') is fitted on the end of the motor output shaft (2') through a tensioning sleeve, and the inner hole of the self-lubricating nylon pinion (3') is inlaid with steel Sleeve, the self-lubricating nylon gear ring (4') is fixed on the drive wheel assembly (10') through locating pins (18'), and the self-lubricating nylon pinion (3') is connected to the self-lubricating nylon gear The ring (4') is meshed, and 6-8 left-handed rope grooves (19') and 6-8 right-handed rope grooves (20') are respectively provided on both sides of the outer circle center of the driving wheel assembly (10'). , the sucker rod suspension rope and the counterweight suspension rope are respectively fixed on the drive wheel assembly, the sucker rod suspension rope and the counterweight suspension rope are wound on the drive wheel assembly in opposite directions, and the sucker rod suspension rope and the counterweight suspension rope are wound on the drive wheel assembly in opposite directions. The counterweight hanging rope shares the left-hand rope groove and the right-hand rope groove on the drive wheel assembly. 6. The heavy-load deceleration drive system according to claim 5, wherein the sucker rod suspension rope is divided into a left-handed sucker rod suspension rope and a right-handed sucker rod suspension rope, and the left-handed sucker rod suspension rope and The right-handed sucker rod suspending rope bypasses the left-handed rope groove and the right-handed rope groove on one side of the drive wheel assembly (10') and is fixed on the sucker rod suspending rope fixing hole (16'). The counterweight suspending rope It is divided into left-handed counterweight hanging rope and right-handed counterweight hanging rope, right-handed counterweight hanging rope and left-handed counterweight hanging rope bypass the right-handed rope groove and left-handed rope groove on the other side of the drive wheel assembly (10') Fix it on the fixing hole (17') of the counterweight sling. 7. The heavy-duty deceleration drive system according to claim 6, wherein the motor output shaft (2') is a tapered shaft, and the tapered shaft is connected with a tapered steel sleeve in the self-lubricating nylon pinion (3'). 8. The heavy-load deceleration drive system according to claim 7 is characterized in that: the heavy-load deceleration drive system is suitable for the medium-sized tower type oil pumping unit below 140kn, and the transmission system reduction ratio i is Within 8, the motor (1') adopts a permanent magnet synchronous motor, the rated speed of the motor (1') is within 160rpm, and the output rated torque is 800-3000N m, which is transmitted through the self-lubricating nylon pinion (3'). To the self-lubricating nylon large ring gear to drive the driving wheel, the drag torque is 9600-40000N m. 9. An oil pumping unit, characterized in that: using the heavy-load deceleration drive system according to any one of claims 1-4, the left-handed rope groove and the right-handed rope groove on the driving wheel assembly (10) are used. The configuration of the rope groove is set according to the stroke of the tower pumping unit. When the left-hand rope groove and the right-hand rope groove are respectively 6 grooves, the stroke that can be achieved is 1.7 times the circumference of the driving wheel. The stroke that can be achieved with 8 grooves is 2.7 times the circumference of the drive wheel. 10. An oil pumping unit, characterized in that: using the heavy-load deceleration drive system according to any one of claims 5-8, the left-hand rope groove and the right-hand rope groove on the drive wheel assembly (10') are used. The configuration of the rope groove is set according to the stroke of the tower pumping unit. When the left-hand rope groove and the right-hand rope groove are 6 grooves respectively, the stroke that can be achieved is 1.7 times the circumference of the driving wheel. The stroke that can be achieved when the rope grooves are 8 grooves is 2.7 times the circumference of the driving wheel.

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