CN201671602U - Lever type beam-pumping unit driven by steel wire rope - Google Patents

Abstract

A lever-type beam-pumping unit driven by a steel wire rope is applied to the technical field of oil extraction in the petroleum industry. Comprises a base, a bracket, a walking beam, a power system, a flexible transmission system and a counterweight mechanism; a motor is fixed on the motor bracket and drives the large belt pulley; the large belt pulley drives the winding drum, and the winding drum drives the flexible transmission system. One end of a winding drum front steel wire rope of the flexible transmission system is fixed on the steel wire rope hanging shaft, bypasses a walking beam front pulley and then bypasses a front tension pulley to be wound on the winding drum; one end of the steel wire rope behind the winding drum is fixed on the steel wire rope hanging shaft, winds the sliding wheel behind the walking beam and then winds the sliding wheel behind the rear tension pulley and is wound on the winding drum; and a counterweight mechanism is hung at the rear end part of the walking beam. The effect is as follows: the crank balance beam pumping unit can be installed and parameters can be adjusted according to the actual requirements of the working conditions of the pumping unit, and the defects of complex structure, more steel consumption, high energy consumption and low system efficiency of the conventional crank balance beam pumping unit are overcome.

Description

Wire Rope Driven Lever Type Beam Pumping Unit

technical field

The utility model relates to the technical field of oil production equipment in the petroleum industry, in particular to a pumping unit, which is a lever-type beam pumping unit driven by a wire rope used for oil extraction on the ground in an oil field.

Background technique

At present, the most widely used pumping unit in the oil field is the crank balance beam pumping unit, which converts the rotational motion of the motor into the up and down reciprocating motion of the sucker rod through a four-bar linkage mechanism, thereby driving the downhole pump. This pumping unit has complex structure, many assembly parts, many steel materials used, high energy consumption, low system efficiency and difficult debugging during operation.

Utility model content

The purpose of this utility model is to provide a lever-type beam pumping unit driven by a steel wire rope, which can complete the oil well pumping work on the ground, and can be installed and adjusted according to the actual needs of the pumping unit and the real-time well conditions of the oil well. parameters, and overcome the shortcomings of the existing crank balance beam pumping unit with complex structure, high steel consumption, high energy consumption and low system efficiency.

The technical scheme adopted by the utility model is: a lever type beam pumping unit driven by a wire rope, including a base, a support, a beam, a power system, a flexible transmission system and a counterweight mechanism. The base is fixed on the installation base pier through anchor screws. The upper plane of the base is fixed with a triangular bracket welded by section steel. The reel assembly is fixed in the center of the base. The front tension seat assembly, brake system and rear tension Seat assembly, motor bracket and guardrail. The top of the bracket is fixed with a beam support base by bolts; the beam support base is connected with a beam, the front end of the beam is connected with a donkey head, and the rear end of the beam is hung with a counterweight assembly; the end of the base is fixed with a counterweight buffer device; There is a limit rod at the front end of the beam to prevent the front end of the beam from rotating too much. A ladder is fixed on the side of the bracket. It is characterized by:

The power system includes a motor, a combined narrow V-belt, a large pulley and a reel assembly. The motor is fixed on the motor bracket, and the pulley on the output shaft of the motor is connected to the large pulley through a combined narrow V-belt; the large pulley is fixed on the reel assembly. The drum assembly includes a drum, and there is a drum support on both sides of the drum. There is a central shaft connection between the drum and the drum support. The wire rope and the end of the steel wire rope behind the drum are fixed on the drum, and the drum support is fixed on the base and located in the center of the bracket;

The flexible transmission system comprises a front tension seat assembly, a beam front pulley, a drum front wire rope, a front tension pulley, a drum rear wire rope, a rear tension pulley, a rear tension seat assembly and a beam rear pulley. The front tension seat assembly is fixed on the base and under the front end of the beam; a pulley seat is fixed outside the front tension seat assembly, and a front tension pulley is arranged on the pulley seat; a front pulley of the beam is fixed under the front end of the beam; One end of the steel wire rope in front of the drum is fixed on the wire rope hanging shaft of the front tension seat assembly, the steel wire rope in front of the drum goes around the front pulley of the beam upwards and then goes down, the steel wire rope in front of the drum winds around the front tension pulley and is wound on the drum, and used The reel wire rope pressing plate is fixed. The rear tension seat assembly is fixed on the base and under the rear end of the beam; a pulley seat is fixed on the outside of the rear tension seat assembly, and there is a rear tension pulley on the pulley seat; a rear pulley of the beam is fixed under the rear end of the beam; One end of the wire rope behind the drum is fixed on the wire rope hanging shaft of the rear tension seat assembly. The barrel wire rope is fixed by the pressure plate. The winding direction of the steel wire rope on the drum after the drum is opposite to the winding direction of the wire rope on the drum before the drum.

The distance from the center of the front pulley of the walking beam to the center of the supporting seat of the traveling beam is equal to the distance from the center of the rear pulley of the traveling beam to the center of the supporting seat of the traveling beam.

The counterweight mechanism is suspended or articulated at the rear end of the beam, and the counterweight mechanism has two types: a box-type counterweight assembly or a curved arm-type counterweight assembly. The box-type counterweight assembly includes a counterweight box, a movable counterweight block and a counterweight body. The counterweight box is a cuboid box, and the movable counterweight block and the counterweight body are fixed in the counterweight box. The weight is on the top of the casing. The counterweight box is welded under the angle steel sides. The curved arm type counterweight assembly includes a curved arm, a movable counterweight plate and a counterweight body. A cylinder welded by steel plates is fixed at the lower end of the curved arm. A movable counterweight plate is fixed, and the movable counterweight plate is fixed on the cylinder with bolts. The movable weight plate is used to adjust the balance.

The front tension seat assembly includes a fixed spring top plate, a front tension seat channel steel, a spring compression bolt, a spring and a movable spring top plate. The fixed spring top plate is welded on the tops of the two front tension seat channel steels. Both ends bottoms are respectively fixed with spring by spring hold-down bolt, and spring hold-down bolt passes spring, and movable spring top plate is arranged at the lower end of spring hold-down bolt, and spring hold-down bolt passes the central hole of movable spring top plate. A wire rope hanging shaft is fixed on the bottom of the movable spring top plate. The front tension pulley is fixed on the sides of two front tension seat channel steels by the pulley seat.

The rear tension seat assembly includes a fixed spring top plate, a rear tension seat channel steel, a spring compression bolt, a spring and a movable spring top plate. The fixed spring top plate is welded on the tops of the two rear tension seat channel steels. Middle bottom is fixed with spring by spring hold-down bolt, and spring hold-down bolt passes spring, and movable spring top plate is arranged at the lower end of spring hold-down bolt, and spring hold-down bolt passes the central hole of movable spring top plate. A wire rope hanging shaft is fixed on the bottom of the movable spring top plate. The rear tension pulley is fixed on the sides of the two rear tension seat channel steels by the pulley seat.

The counterweight buffer device is a multi-stage elastic shock bearing device.

The working principle of the lever type beam pumping unit driven by wire rope: refer to Figure 1. The reciprocating rotation output power of the motor 7 is transmitted to the large pulley 5 through the narrow V-belt 6 connected by the belt transmission device, and the rotation of the large pulley 5 drives the reel 4 to reciprocate; the reel 4 drives the steel wire rope 19 and the coil The steel wire rope 31 reciprocatingly moves behind the barrel, thereby driving the beam 24 and the donkey head 23 to swing back and forth around the beam support seat 27. There are a rope and a rope hanger 22 at the bottom of the donkey head 23, and the rope and the rope hanger 22 move up and down to drive The sucker rod pumps oil back and forth.

Beneficial effects of the utility model: the electric motor 7 provides power in a direct drive mode, which saves the reducer, crank device, balance block, beam and beam support, and connecting rod device parts in the crank balance beam pumping unit.

The motor is controlled by a frequency conversion speed regulating device, which can realize stepless adjustment to the stroke and stroke times of the pumping unit, and can effectively realize the stroke speed control of up and down. When the power is cut off, the operation needs to be stopped. At this time, the automatic braking system starts immediately, so that the motor stops immediately, and then the whole system stops running. At the same time, the alarm system starts and can display the current fault.

The lever type beam pumping unit driven by wire rope has the main innovations of the utility model: 1. The motor is controlled by a frequency conversion speed regulating device; 2. The transmission system is realized by a flexible steel wire rope; 3. The balance device is controlled by an adjustable tail weight 4. Parts such as reducer, crank device, balance weight, beam and beam support, connecting rod device in the crank balance beam pumping unit are omitted.

1. The balance method of the traditional beam pumping unit has been changed. The unique balance structure can achieve precise balance, and the unbalanced force of the operating mechanism is zero, which greatly reduces the output power of the power system.

2. The transmission system is designed as a flexible transmission system, which has completely changed the rigid transmission system of the crank balance beam pumping unit, thereby effectively reducing the impact of reversing; improving the power saving rate; and improving the durability of transmission system components.

3. The structure of this type of pumping unit is compact. Compared with the crank balance beam pumping unit, the external size is small, and at the same time, rigid transmission parts such as reducer, crank, balance block, beam and beam support, and connecting rod device are omitted. , Reduced wearing parts, so that it has a simple and reliable structure, safe and stable operation, high failure rate and long service life. At the same time, due to saving about 40% of steel materials, the manufacturing cost is reduced.

4. Low noise during operation, no oil leakage, no pollution; high power saving rate, the power saving rate of the whole machine reaches 30-50%.

5. The design and positioning of the utility model is a mechatronics product, and the stroke and stroke times are infinitely adjustable and convenient to adjust, which reduces the labor intensity of the operator and is safe and reliable.

6. The motor is controlled by an intelligent frequency conversion speed regulating device, which can realize stepless adjustment of the stroke and stroke times of the pumping unit, and can effectively realize the stroke speed control of up and down. In the event of a sudden power failure or sudden power failure, it is necessary to stop the operation. At this time, the automatic braking system starts immediately to stop the motor immediately, and then the entire system stops running. At the same time, the alarm system starts and can display the current fault.

Description of drawings

Fig. 1 is a structural schematic diagram of a lever type beam pumping unit driven by a steel wire rope of the present invention.

FIG. 2 is a schematic view of the box counterweight assembly 34 .

Fig. 3 is a structural schematic diagram of a lever type beam pumping unit driven by a steel wire rope of the present invention.

FIG. 4 is a schematic diagram of the curved arm counterweight assembly 42 .

Fig. 5 is a schematic diagram of the structure of the reel device.

FIG. 6 is a schematic structural view of the front tension seat assembly 18 .

FIG. 7 is a schematic structural view of the rear tension seat assembly 38 .

In the figure: 1. Install the foundation pier; 2. Base; 3. Bracket; 4. Drum; 4-1. Drum wire rope pressure plate; 4-2. Drum support; V-belt; 7. Motor; 8. Braking system; 11. Anchor screw; 12. Pulley seat; 13. Front tension pulley; 14. Wire rope hanging shaft; 15. Movable spring top plate; 16. Spring; 17. Spring compression Bolt; 18. Front tension seat assembly; 19. Steel wire rope in front of the reel; 22. Rope hanger; 23. Donkey head; 24. Walking beam; Beam supporting seat; 31. Reel wire rope; 32. Beam front pulley; 33. Beam rear pulley; 34. Box-type counterweight assembly; 35. Guardrail; 36. Counterweight buffer device; 37. Rear Tension pulley; 38. Rear tension seat assembly; 39. Motor bracket; 40. Counterweight body; 41. Movable counterweight plate; 42. Curved arm counterweight assembly; 43. Movable counterweight block; 44. Counterweight box; 45. Fixed spring top plate; 46. Front tension seat channel steel; 47. Rear tension seat channel steel.

Part A represents the limit position where the box-type counterweight assembly 34 descends;

Part B represents the limit position where the curved arm type counterweight assembly 42 descends.

Detailed ways

Embodiment 1: Taking a lever-type beam pumping unit whose counterweight mechanism is box-type counterweight and wire rope transmission as an example, the utility model is further described in detail.

See Figure 1. A lever type beam pumping unit driven by a wire rope includes a base 2, a support 3, a beam 24, a power system, a flexible transmission system and a counterweight mechanism. The base 2 is fixed on the installation foundation pier 1 through the anchor screws 11, a triangular bracket 3 welded by section steel is fixed on the upper plane of the base 2, a reel assembly is fixed in the center of the base 2, and a front Tension seat assembly 18, a brake system 8, a rear tension seat assembly 38, motor support 39 and guardrail 35. Be fixed with beam support seat 27 by bolt on support 3 tops. On the beam support seat 27, the beam 24 is connected, and the two ends of the beam 24 can swing up and down with the axis of the beam support seat 27 as the center of circle. A donkey head 23 is connected to the front end of the upstream beam 24, and a box-type counterweight assembly 34 is suspended from the rear end of the beam 24. A counterweight buffer device 36 is fixed at the tail end of the base 2 ; Support 3 sides are fixed people's ladder 26.

The power system includes a variable frequency motor 7, a combined narrow V-belt 6, a large pulley 5 and a reel assembly. A variable frequency motor 7 is fixed on the motor bracket 39, and the pulley on the output shaft of the variable frequency motor 7 passes through the combined narrow V belt. 6 connects big belt pulley 5. See Figure 5. The large pulley 5 is fixed at the end of the center shaft of the reel assembly; the reel assembly includes a reel 4, and there is a reel support 4-2 on both sides of the reel 4, and the reel 4 and the reel support 4 There is a central shaft connection between -2, and the reel wire rope pressure plate 4-1 can fix the ends of the reel front wire rope 19 and the reel rear wire rope 31 on the reel 4, and the reel support 4-2 is fixed on the base 2 and located in the center of bracket 3.

See Figure 1. The flexible transmission system comprises a front tension seat assembly 18, a beam front pulley 32, a steel wire rope 19 before a reel, a front tension pulley 13, a steel rope 31 after a drum, a rear tension pulley 37, a rear tension pulley Block assembly 38 and a beam rear pulley 33. The front tension seat assembly 18 is fixed on the base 2 and below the front end of the beam 24; a pulley seat 12 is fixed on the outside of the front tension seat assembly 18, and the front tension pulley 13 is arranged on the pulley seat 12; The front pulley 32 of the beam is fixed; one end of the front steel wire rope 19 of the reel is fixed on the wire rope hanging shaft 14 of the front tension seat assembly 18, and the front wire rope 19 of the reel upwards goes around the front pulley 32 of the beam and then goes down, and Wire rope 19 walks around front tension pulley 13 again and is wound on reel 4, and fixes with reel wire rope pressing plate 4-1. The rear tension seat assembly 38 is fixed on the base 2 and below the rear end of the beam 24; the pulley seat 12 is fixed on the outside of the rear tension seat assembly 38, and the rear tension pulley 37 is arranged on the pulley seat 12; The rear pulley 33 of the beam is fixed below the end; one end of the wire rope 31 after the reel is fixed on the wire rope hanging shaft 14 of the rear tension seat assembly 38, and the wire rope 31 goes around the rear pulley 33 of the beam upwards after the reel. The steel wire rope 31 after the drum is wound around the back tension pulley 37 on the reel 4 again, and fixes with the reel wire rope pressing plate 4-1. The direction in which the wire rope 31 is wound on the drum 4 after the drum is opposite to the direction in which the wire rope 19 is wound on the drum 4 before the drum.

The distance from the center of the front pulley 32 of the beam to the center of the beam support seat 27 is equal to the distance from the center of the rear pulley 33 of the beam to the center of the support seat 27 of the beam.

A box-type counterweight assembly 34 is suspended at the rear end of the beam 24 . Box type counterweight assembly 34 comprises counterweight box 44, movable counterweight 43 and counterweight body 40, and counterweight box 44 is a cuboid box, and movable counterweight 43 and counterweight body 40 are fixed in counterweight box 44, and counterweight body 40 is in The bottom of the casing, the movable counterweight 43 is on the top of the casing. The counterweight box 44 is welded under the angle steel sides.

See Figure 6. Front tension seat assembly 18 comprises fixed spring top plate 45, front tension seat channel steel 46, spring compression bolt 17, spring 16 and movable spring top plate 15, fixed spring top plate 45 is welded on the top of two front tension seat channel steel 46, The lower parts of the two ends of the fixed spring top plate 45 are respectively fixed with springs 16 by spring hold-down bolts 17, and the spring hold-down bolts 17 pass through the springs 16, and there is a movable spring top plate 15 at the lower end of the spring hold-down bolts 17, and the spring hold-down bolts 17 Pass through the central hole of the movable spring top plate 15. The bottom of movable spring top plate 15 is fixed with steel wire rope hanging shaft 14. Front tension pulley 13 is fixed on the sides of two front tension seat channel steel 46 by pulley seat 12.

See Figure 7. Rear tension seat assembly 38 comprises fixed spring top plate 45, rear tension seat channel steel 47, spring compression bolt 17, spring 16 and movable spring top plate 15, fixed spring top plate 45 is welded on the top of two rear tension seat channel steel 47, The middle lower part of the fixed spring top plate 45 is fixed with a spring 16 by a spring hold-down bolt 17, and the spring hold-down bolt 17 passes through the spring 16. There is a movable spring top plate 15 at the lower end of the spring hold-down bolt 17, and the spring hold-down bolt 17 passes through The central hole of movable spring top plate 15. The bottom of movable spring top plate 15 is fixed with steel wire rope hanging shaft 14. Back tension pulley 37 is fixed on the side of two back tension seat channel steels 47 by pulley seat 12.

The counterweight buffer device 36 is a multi-stage elastic shock bearing device.

The balance adjustment method is the adjustment method of manually increasing or decreasing weights. The counterweight is divided into two parts: a counterweight body 40 and a movable counterweight block 43 (adjustable counterweight). The counterweight 40 is the basic balance mass calculated according to the minimum suspension point load in the installed oil well, and the quality of the counterweight 40 does not need to be adjusted; , The subtracted counterweight part, that is, calculate the total mass m of the required counterweight according to the actual load of the installed oil well, and then subtract the mass m1 of the fixed counterweight part to get the mass difference m2, m2=m-m1 . In actual operation, only the movable counterweight 43 part needs to be adjusted. During the installation process of the pumping unit or before installation, the required counterweight mass is calculated according to the working conditions of the pumping unit and well conditions. When the box-type counterweight assembly 34 falls to the limit position A, the box-type counterweight assembly Increase or decrease movable counterweight 43 in the counterweight box 44 of 34, reach satisfactory balance effect and get final product, it is more convenient to implement, and balance adjustment is also very accurate.

Embodiment 2: The basic structure of the lever-type beam pumping unit driven by wire rope is basically the same as that of Embodiment 1, the difference is that the counterweight mechanism of this embodiment adopts the curved arm counterweight assembly 42 . See Figure 4. The curved arm type counterweight assembly 42 includes a curved arm, a movable counterweight plate 41 and a counterweight body 40. A cylinder welded by steel plates is fixed at the lower end of the curved arm. The counterweight body 40 is housed in the cylinder. The end is fixed with movable balance plate 41, and movable balance plate 41 is fixed on the cylinder with bolts. The movable counterweight plate 41 is used to adjust the balance.

Claims (6)

1. the lever beam-pumping unit of a wire rope transmission comprises base (2), support (3), walking beam (24), dynamical system, flexible transmission system and balance weight mechanism; Base (2) is fixed on by fot screw (11) and installs on the foundation pier (1), base (2) is gone up the plane and is fixed with the support (3) that leg-of-mutton employing shaped steel is welded into, base (2) center fixation has the reel assembly, pulling force seat assembly (18), brake system (8), back pull seat assembly (38), support of motor (39) and protective guard (35) before being fixed with on the base (2), there is walking beam supporting seat (27) at support (3) top by bolt; Be connected with walking beam (24) on the walking beam supporting seat (27), walking beam (24) front end is connected with horse head (23), and walking beam (24) rear end hangs the counterweight assembly; Base (2) tail end is fixed with counterweight buffer (36); Be fixed with the spacing pole of walking beam front end (25) on the support (3), support (3) side is fixed with helper (26); It is characterized in that:

Dynamical system comprises motor (7), joint group narrow V belt (6), big belt pulley (5) and reel assembly, is fixed with motor (7) on support of motor (39), and the belt pulley on motor (7) output shaft connects big belt pulley (5) by joint group narrow V belt (6); Big belt pulley (5) is fixed on the central axis end of reel assembly; The reel assembly comprises a reel (4), reel (4) both sides have a reel bearing (4-2) respectively, there is central axis to be connected between reel (4) and the reel bearing (4-2), roller steel wire rope pressing plate (4-1) with wire rope before the reel (19) and reel after the end of wire rope (31) be fixed on the reel (4), reel bearing (4-2) is fixed on the center that support (3) were gone up and be positioned to base (2);

Flexible transmission system comprises wire rope (31) behind wire rope (19) before the preceding pulling force seat assembly (18), walking beam front wheel (32), reel, preceding pulling force pulley (13), the reel, back pull pulley (37), back pull seat assembly (38) and walking beam rear wheel (33); Before pulling force seat assembly (18) be fixed on that base (2) is gone up and in walking beam (24) front end below; Be fixed with pulley base (12) in preceding pulling force seat assembly (18) outside, preceding pulling force pulley (13) is arranged on the pulley base (12); Front end below at walking beam (24) is fixed with walking beam front wheel (32); An end of wire rope (19) is fixed on the wire rope hanging scroll (14) of preceding pulling force seat assembly (18) before the reel, wire rope (19) is upwards walked around walking beam front wheel (32) back downwards before the reel, pulling force pulley (13) was wrapped on the reel (4) before wire rope (19) was walked around again before the reel, and fixing with roller steel wire rope pressing plate (4-1); Back pull seat assembly (38) is fixed on that base (2) is gone up and in below, walking beam (24) rear end; Be fixed with pulley base (12) in back pull seat assembly (38) outside, back pull pulley (37) is arranged on the pulley base (12); Below, rear end at walking beam (24) is fixed with walking beam rear wheel (33); One end of wire rope behind the reel (31) is fixed on the wire rope hanging scroll (14) of back pull seat assembly (38), wire rope behind the reel (31) is upwards walked around walking beam rear wheel (33) back downwards, wire rope behind the reel (31) is walked around back pull pulley (37) again and is wrapped on the reel (4), and fixing with roller steel wire rope pressing plate (4-1); The direction of wire rope behind the reel (31) wire rope (19) winding on reel (4) before direction that reel (4) go up to twine and reel is opposite;

Walking beam front wheel (32) center equates with the distance of walking beam rear wheel (33) center to walking beam supporting seat (27) center to the distance at walking beam supporting seat (27) center;

Hang or hinged balance weight mechanism in walking beam (24) rearward end, balance weight mechanism adopts box type weight assembly (34) or curved boom formula counterweight assembly (42).

2. the lever beam-pumping unit of wire rope transmission according to claim 1, it is characterized in that: described box type weight assembly (34) comprises ballast box (44), movable weight (43) and balance weight body (40), ballast box (44) is a cuboid box, in ballast box (44), be fixed with movable weight (43) and balance weight body (40), balance weight body (40) is at lower box, movable weight (43) is on the top of casing, and ballast box (44) is welded on the angle steel side-lower.

3. the lever beam-pumping unit of wire rope transmission according to claim 1, it is characterized in that: described curved boom formula counterweight assembly (42) comprises curved boom, moving counterweight dish (41) and balance weight body (40), be fixed with the cylinder that steel plate is welded in the lower end of curved boom, balance weight body (40) is housed in the cylinder, outer two ends of cylinder are fixed with moving counterweight dish (41), and moving counterweight dish (41) is fixed by bolts on the cylinder.

4. according to claim 1, the lever beam-pumping unit of 2 or 3 described wire rope transmissions, it is characterized in that: pulling force seat assembly (18) comprises fixing spring top board (45) before described, preceding pulling force seat channel-section steel (46), spring compression bolt (17), spring (16) and movable spring top board (15), fixing spring top board (45) is welded on the top of two preceding pulling force seat channel-section steels (46), bottom, two ends at fixing spring top board (45) is fixed with spring (16) by spring compression bolt (17) respectively, spring compression bolt (17) passes spring (16), in the lower end of spring compression bolt (17) movable spring top board (15) is arranged, spring compression bolt (17) passes the centre bore of movable spring top board (15), be fixed with wire rope hanging scroll (14) in the bottom of movable spring top board (15), preceding pulling force pulley (13) is fixed on the side of two preceding pulling force seat channel-section steels (46) by pulley base (12).

5. according to claim 1, the lever beam-pumping unit of 2 or 3 described wire rope transmissions, it is characterized in that: described back pull seat assembly (38) comprises fixing spring top board (45), back pull seat channel-section steel (47), spring compression bolt (17), spring (16) and movable spring top board (15), fixing spring top board (45) is welded on the top of two back pull seat channel-section steels (47), middle lower portion at fixing spring top board (45) is fixed with spring (16) by spring compression bolt (17), spring compression bolt (17) passes spring (16), in the lower end of spring compression bolt (17) movable spring top board (15) is arranged, spring compression bolt (17) passes the centre bore of movable spring top board (15), be fixed with wire rope hanging scroll (14) in the bottom of movable spring top board (15), back pull pulley (37) is fixed on the side of two back pull seat channel-section steels (47) by pulley base (12).

6. according to the lever beam-pumping unit of claim 1,2 or 3 described wire rope transmissions, it is characterized in that: described counterweight buffer (36) is that a multistage elasticity is held flushing device.

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