Load loss protection device for tower type pumping unit

Abstract

The invention discloses a load loss protection device for a tower type pumping unit. The tower type pumping unit mainly solves the problem that safety accidents happen due to the fact that a balancing weight falls off when a sucker rod of an existing tower type pumping unit breaks off or a belt is broken. The device is characterized in that a clamping groove base (1) is fixed to a speed reduction cylinder support, a pawl base (12) is fixed to a speed reduction cylinder (13), a plurality of pawls (9) are connected to the pawl base (12), and clamping grooves (3) matched with the pawls (9) are formed in the inner wall of the clamping groove base (1); when the oil pumping unit runs, the speed reduction cylinder (13) drives the pawl base (12) and the pawl (9) to rotate in the clamping groove base (1), and when the oil pumping unit loses load, the pawl (9) is clamped in the clamping groove (3), so that the speed reduction cylinder (13) stops rotating. When a sucker rod is broken or a belt is broken and other load-loss conditions occur, the load-loss protection device can brake in time, the balancing weight is prevented from falling rapidly, and safety accidents are avoided.

Description

Technical Field

[0001] The invention relates to the field of oil field production equipment, in particular to a load loss protection device for a tower type oil pumping unit. Background Art

[0002] The tower pumping unit is a type of beamless pumping unit. Because it eliminates the four-bar linkage of the traditional beam pumping unit, it cannot use balancing methods such as crank balance and beam balance. In order to ensure the balance of the motor current during its operation, a counterweight is added to the other end of the sucker rod to overcome part of the gravity downhole. However, during the production process, if there is a sudden belt breakage at the end of the sucker rod, or the sucker rod is disconnected or the belt breaks, etc., the counterweight may fall rapidly if there is no reliable protection device, which poses a certain safety hazard. Summary of the invention

[0003] In order to overcome the problem that the counterweight may fall and cause a safety accident when a sucker rod or belt breaks in the existing tower-type oil pumping unit, the present invention provides an underload protection device for the tower-type oil pumping unit. The underload protection device can brake in time when an underload situation such as a sucker rod breaking or a belt breaking occurs, thereby preventing the counterweight from falling rapidly and avoiding a safety accident.

[0004] The technical solution of the present invention is: a load-loss protection device for a tower-type oil pumping unit, comprising a reduction cylinder, two ends of the reduction cylinder connected to a reduction cylinder bracket through an axis, and a slot base, characterized in that: the slot base is fixed on the reduction cylinder bracket, a pawl base is fixed on the reduction cylinder, a plurality of pawls are connected to the pawl base, and a slot matching the pawl is opened on the inner wall of the slot base; when the oil pumping unit is running, the reduction cylinder drives the pawl base and the pawl to rotate inside the slot base, and when the oil pumping unit loses load, the pawl is stuck in the slot to stop the reduction cylinder from rotating.

[0005] The rear end of the pawl is connected to the pawl base through a rotating shaft.

[0006] A ratchet traction device is provided on the ratchet base at a position corresponding to the front end of the ratchet.

[0007] The ratchet traction device comprises a traction nail fixing seat, which is fixed on the ratchet base. The traction nail fixing seat is connected to the ratchet traction nail. A retaining spring is arranged between the rear end of the ratchet traction nail and the traction nail fixing seat. The front end of the ratchet is connected to the ratchet traction nail through a pin.

[0008] A pin hole is formed on the pawl at a position corresponding to the pin, and the pin hole is an oblong movable hole.

[0009] The slot base is provided with a slot base mounting hole, and the slot base mounting hole is connected to the reduction cylinder bracket through bolts.

[0010] A central shaft hole is opened at the center of the ratchet base, and the reduction cylinder passes through the central shaft hole and is fixed on the ratchet base.

[0011] There are three ratchets, which are evenly distributed along the circumferential direction, and three slots are opened on the slot base corresponding to the front ends of the ratchets.

[0012] When the oil pump operates normally, the pawl traction pin tightens the pawl under the elastic force of the retaining spring, and the reduction cylinder drives the pawl base and the pawl to rotate.

[0013] When the oil pump loses load, the reduction cylinder rotates faster, driving the pawl mounting base to rotate faster. The pawl rotates around the rotation axis under the action of centrifugal force, and the front end of the pawl moves outward into the slot, braking the reduction cylinder to prevent the counterweight from falling.

[0014] The present invention has the following beneficial effects: due to the adoption of the above-mentioned scheme, the slot base is fixed to the reduction cylinder bracket, and the pawl and the pawl base are fixed to the reduction cylinder. In this way, when the oil pump loses load, the reduction cylinder rotates faster, causing the pawl to enter the slot under the action of centrifugal force, thereby realizing the braking of the reduction cylinder, preventing the counterweight block from falling rapidly, and playing a role in load protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a top view of the present invention.

[0016] In the figure, 1-slot base, 2-slot base mounting hole, 3-slot, 4-ratchet traction nail, 5-circlip, 6-traction nail fixing seat, 7-pin, 8-movable hole, 9-ratchet, 10-ratchet rotating shaft, 11-center axis hole, 12-ratchet base, 13-reduction cylinder. Implementation

[0017] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 , Figure 2 As shown, a load-loss protection device for a tower-type oil pumping unit includes a reduction cylinder 13 and a slot base 1. The two ends of the reduction cylinder 13 are connected to the reduction cylinder bracket through a rotating shaft. The slot base 1 is fixed to the reduction cylinder bracket. The slot base 1 is provided with a slot base mounting hole 2. The slot base mounting hole 2 is connected to the reduction cylinder bracket through bolts, so that the slot base 1 and the reduction cylinder bracket are fixed together. The reduction cylinder 13 passes through the central axis hole 11 on the pawl base 12, and the reduction cylinder 13 is fixed to the pawl base 12. In this way, the slot base 1 and the pawl base 12 can rotate with each other.

[0018] The pawl base 12 is connected to a plurality of pawls 9. Preferably, there are three pawls 9, which are evenly distributed along the circumferential direction. A slot 3 matching the pawl 9 is formed on the inner wall of the slot base 1. When the pumping unit is running, the pawl 9 is retracted, and the reduction cylinder 13 drives the pawl base 12 and the pawl 9 to rotate inside the slot base 1; when the pumping unit loses load, the pawl 9 pops out and is stuck in the corresponding slot 3, so that the reduction cylinder 13 stops rotating, thereby realizing load-loss protection.

[0019] Specifically, the front end of the pawl 9 is a tip that matches the slot 3, and the rear end of the pawl 9 is connected to the pawl base 12 through the rotating shaft 10, and the pawl 9 can rotate around the rotating shaft 10. A pawl traction device is provided on the pawl base 12 corresponding to the front end of the pawl 9, and the pawl traction device can realize the retraction and ejection of the pawl 9. The pawl traction device includes a traction nail fixing seat 6, the traction nail fixing seat 6 is fixed on the pawl base 12, and the traction nail fixing seat 6 is connected to the pawl traction nail 4. After the pawl traction nail 4 passes through the traction nail fixing seat 6, the front end is connected to the pawl traction nail 4 through the pin 7, and a retaining spring 5 is provided between the rear end of the pawl traction nail 4 and the traction nail fixing seat 6. A pin hole is opened on the pawl 9 corresponding to the pin 7, and the pin hole is an oblong movable hole 8. When the pawl 9 rotates along the rotating shaft 10, the pin 7 can move back and forth in the movable hole 8.

[0020] The slot base 1 of the unload protection device is fixed on the reduction cylinder bracket, and the pumping unit counterweight is connected to the reduction cylinder 13 through a belt. When the pumping unit is running normally and smoothly, the pumping unit counterweight moves up and down, driving the reduction cylinder 13 to rotate through the belt, and the pawl traction nail 4 tightens the pawl 9 under the elastic force of the clamping spring 5, so that the front end of the pawl 9 is retracted inward, and the reduction cylinder 13 drives the pawl base 12 and the pawl 9 to rotate, and the unload device does not work.

[0021] When the rod column breaks or the belt connecting the bare rod breaks, the counterweight will fall rapidly under the action of gravity due to the loss of balance. At this time, the reduction cylinder 13 will accelerate its rotation under the traction of the belt, driving the pawl mounting base 12 to accelerate its rotation. The pawl 9 rotates around the rotating axis 10 under the action of centrifugal force, so that the front end of the pawl moves outward into the slot 3 on the slot base 1. Because the slot base 1 is fixed on the reduction cylinder bracket, the reduction cylinder is braked, thereby preventing the counterweight from falling rapidly and playing a role in load protection.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A load loss protection device for a tower-type oil pumping unit, comprising a reduction cylinder (13), two ends of the reduction cylinder (13) connected to a reduction cylinder bracket through a shaft, and a slot base (1), characterized in that: The slot base (1) is fixed on a reduction cylinder bracket, a pawl base (12) is fixed on the reduction cylinder (13), a plurality of pawls (9) are connected to the pawl base (12), and a slot (3) matching with the pawl (9) is formed on the inner wall of the slot base (1); when the oil pump is running, the reduction cylinder (13) drives the pawl base (12) and the pawl (9) to rotate inside the slot base (1); when the oil pump loses load, the pawl (9) is stuck in the slot (3), causing the reduction cylinder (13) to stop rotating.

2. The unload protection device for a tower-type oil pumping unit according to claim 1, characterized in that: The rear end of the ratchet (9) is connected to the ratchet base (12) via a rotating shaft (10).

3. The load loss protection device for a tower type oil pumping unit according to claim 2 is characterized in that: A ratchet traction device is provided on the ratchet base (12) at the front end corresponding to the ratchet (9).

4. The load loss protection device for a tower type oil pumping unit according to claim 3 is characterized in that: The ratchet traction device comprises a traction nail fixing seat (6), the traction nail fixing seat (6) is fixed on the ratchet base (12), the traction nail fixing seat (6) is connected to the ratchet traction nail (4), a retaining spring (5) is provided between the rear end of the ratchet traction nail (4) and the traction nail fixing seat (6), and the front end of the ratchet (9) is connected to the ratchet traction nail (4) via a pin (7).

5. The load loss protection device for a tower type oil pumping unit according to claim 4, characterized in that: A pin hole is formed on the ratchet (9) at a position corresponding to the pin (7), and the pin hole is an oblong movable hole (8).

6. The load loss protection device for a tower type oil pumping unit according to claim 5, characterized in that: The slot base (1) is provided with a slot base mounting hole (2), and the slot base mounting hole (2) is connected to the reduction cylinder bracket via bolts.

7. The load loss protection device for a tower type oil pumping unit according to claim 6, characterized in that: A central shaft hole (11) is formed at the center of the ratchet base (12), and a reduction cylinder (13) passes through the central shaft hole (11) and is fixed on the ratchet base (12).

8. The load loss protection device for a tower type oil pumping unit according to claim 7, characterized in that: There are three ratchet claws (9) evenly distributed along the circumferential direction, and three slots (3) are formed on the slot base (1) corresponding to the front ends of the ratchet claws (9).

9. The load loss protection device for a tower type oil pumping unit according to claim 8, characterized in that: When the oil pump is operating normally, the ratchet traction nail (4) tightens the ratchet (9) under the elastic force of the retaining spring (5), and the reduction cylinder (13) drives the ratchet base (12) and the ratchet (9) to rotate.

10. The load loss protection device for a tower type oil pumping unit according to claim 9, characterized in that: When the oil pump loses load, the reduction cylinder (13) rotates faster, driving the pawl mounting base (12) to rotate faster. The pawl (9) rotates around the rotation axis (10) under the action of centrifugal force, and the front end of the pawl moves outward into the slot (3), braking the reduction cylinder (13) to prevent the counterweight from falling.

Images