A linkage and coordination mechanism for an oil pumping mechanism

Abstract

A linkage mechanism for a pumping unit's braking system, relating to the field of pumping unit equipment operation and maintenance technology, includes a brake wheel, brake clamps, brake friction pads, a return spring, a spring shaft, a fixing frame, and a linkage mechanism. A mounting frame is fixedly installed on the reduction gearbox below the brake clamps. Two internal gears and two external gears are mounted on the mounting frame. A rack is positioned between the two internal gears, with each internal gear meshing with one external gear. The up-and-down movement of the rack directly drives the two internal gears to rotate in opposite directions and indirectly drives the two external gears to rotate in opposite directions. The lower end faces of the two brake clamps each have spur teeth, which mesh with the spur teeth of the two brake clamps. The opposite rotation of the two external gears drives the opening or closing of the two brake clamps, thereby ensuring that the opening and closing degrees of the two brake clamps are always consistent, solving the problem of uneven wear of the brake friction pads.

Description

Technical Field

[0001] This utility model belongs to the field of oil pumping unit equipment operation and maintenance technology, and in particular relates to a linkage and cooperation mechanism of an oil pumping unit braking mechanism. Background Technology

[0002] The beam pumping unit is a widely used oil production machine in oil fields. Its braking system is typically an external clamping brake, which includes a brake wheel, two semi-circular brake clamps, two arc-shaped brake friction pads, two return springs, and a multi-link system. The tops of the two brake clamps are mounted on the pumping unit's gearbox using pins, and a spring shaft passes through the bottom of the two brake clamps. A fixing bracket is fixed in the middle of the spring shaft, and the two return springs are respectively located on the spring shafts on the left and right sides of the fixing bracket. In the released state, the two return springs apply elastic thrust to the two brake clamps, moving them away from the brake wheel. However, in actual use, it has been found that the opening and closing degrees of the two brake clamps are not always consistent, leading to uneven wear of the brake friction pads. Utility Model Content

[0003] To address the problems in the background art, this utility model provides a linkage and cooperation mechanism for the braking mechanism of an oil pumping machine. This utility model ensures that the opening and closing degrees of the two brake clamps are always consistent, thus avoiding uneven wear.

[0004] The technical solution provided by this utility model is: a linkage mechanism for a pumping unit's braking mechanism, including a brake wheel, a brake clamp, brake friction pads, a return spring, a spring shaft, a fixing frame, and a linkage mechanism. A mounting frame is fixedly installed on the reduction gearbox below the brake clamp. Two internal gears and two external gears are mounted on the mounting frame. The two internal gears and two external gears are of the same specification, thus ensuring the same transmission ratio. A rack is provided between the two internal gears, with each side of the rack meshing with one of the two internal gears, and each of the two internal gears meshing with one of the external gears. Therefore, the up-and-down movement of the rack directly drives the two internal gears... The gears rotate in opposite directions and indirectly drive the two external gears to rotate in opposite directions. The lower end faces of the two brake rims are respectively equipped with spur teeth. The two external gears mesh with the spur teeth of the two brake rims respectively. Thus, the reverse rotation of the two external gears drives the opening or closing of the two brake rims, thereby ensuring that the opening and closing degree of the two brake rims is always consistent and solving the problem of uneven wear of the brake friction pads. A rack drive rod is provided below the rack. The rack drive rod is pivotally connected to the reduction gearbox. One end of the rack drive rod is hinged to the vertical rod of the linkage mechanism, and the other end of the rack drive rod is hinged to the lower end of the rack. This application does not require a separate drive mechanism and can achieve drive by following the braking and unlocking of the connecting mechanism.

[0005] A further technical solution is: a straightening cylinder is fixedly installed on the pumping unit frame below the rack, and the lower part of the rack is slidably installed inside the straightening cylinder. The straightening cylinder is used to straighten the rack and ensure that the rack moves along the axial direction of the straightening cylinder.

[0006] A further technical solution is to use stainless steel for the two internal gears, two external gears, and rack to prevent rusting.

[0007] A further technical solution is to install a sliding bearing between the straightening cylinder and the rack to reduce friction between them.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. This application uses two external gears to drive the opening and closing of the two brake rings respectively, so that the opening and closing degree of the two brake rings is always consistent and there is no uneven wear.

[0010] 2. This application does not require additional power; it can be achieved by using the braking and de-braking actions of the linkage mechanism of the pumping unit.

[0011] 3. This application can forcibly separate the two brake clamps when releasing the brakes, solving the problem of difficulty in separating the brake clamps when they are stuck. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Brake wheel; 2. Brake friction pad; 3. Brake clamp; 4. Linkage mechanism; 5. Straightening cylinder; 6. Rack drive rod; 7. Rack; 8. Internal gear; 9. External gear; 301. Spur gear; 10. Spring shaft; 11. Fixing frame. Detailed Implementation

[0014] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] This embodiment includes a brake wheel 1, a brake clamp 3, a brake friction pad 2, a return spring, a spring shaft 10, a fixing frame 11, and a linkage mechanism 4. These are existing technologies and will not be described in detail here.

[0016] The most significant innovation of this invention lies in the following: a mounting bracket is fixedly installed on the reduction gearbox below the brake clamp 3. Two internal gears 8 and two external gears 9 are mounted on the mounting bracket. The two internal gears 8 and the two external gears 9 are of the same specification, thus ensuring the same transmission ratio. A rack 7 is provided between the two internal gears 8, with both sides of the rack 7 meshing with the two internal gears 8 respectively. Each internal gear 8 meshes with one external gear 9. Thus, the up-and-down movement of the rack 7 directly drives the two internal gears 8 to rotate in opposite directions and indirectly drives the two external gears 9 to rotate in opposite directions. The lower end faces of the two brake clamps 3 are respectively equipped with spur teeth 301. The two external gears 9 mesh with the spur teeth 301 of the two brake clamps 3 respectively. Thus, the opposite rotation of the two external gears 9 drives the two brake clamps 3 to open or close, thereby ensuring that the opening and closing degree of the two brake clamps 3 is always consistent, solving the problem of uneven wear of the brake friction pads 2.

[0017] A rack drive rod 6 is provided below the rack 7. The middle part of the drive rod is pivotally connected to the reduction gearbox. One end of the rack drive rod 6 is hinged to the vertical rod of the linkage mechanism 4, and the other end of the rack drive rod 6 is hinged to the lower end of the rack 7.

[0018] The working process of this application is as follows: When the linkage mechanism 4 performs the braking action, it normally drives the two brake clamps 3 to clamp together. Under the linkage action of the external gear 9, internal gear 8, and rack 7 below the two brake clamps 3, the clamping degree of the two brake clamps 3 is consistent, and there is no uneven force on the two brake friction pads 2. When the linkage mechanism 4 performs the releasing action, it no longer applies force to the return spring. If the gap between the brake clamp 3 and the spring shaft 10 is stuck due to oil sand retention, and the return spring force cannot smoothly return the brake clamp 3 to its original position, then this application will perform the function of driving the brake clamp 3 to return to its original position. Specifically, when releasing the brake, the linkage mechanism 4 moves upward, causing the left end of the rack drive rod 6 to move upward, thereby causing the right end to move downward, which in turn causes the rack 7 to move downward. The downward movement of the rack 7 drives the internal gear 8 and the external gear 9 to rotate. The left external gear 9 rotates counterclockwise, and the right external gear 9 rotates clockwise, forcibly separating the two brake clamps 3. The degree of separation is consistent, avoiding uneven wear caused by uneven separation.

[0019] This application does not require a separate drive mechanism; it can be driven entirely by the braking and de-braking of the connecting mechanism.

[0020] A straightening cylinder 5 is fixedly installed on the pumping unit frame below the rack 7. The lower part of the rack 7 is slidably installed inside the straightening cylinder 5. The straightening cylinder 5 is used to straighten the rack 7 and ensure that the rack 7 moves along the axial direction of the straightening cylinder 5.

[0021] The two internal gears 8, the two external gears 9, and the rack 7 are all made of stainless steel to prevent rusting.

[0022] A sliding bearing is provided between the straightening cylinder 5 and the rack 7 to reduce friction between them.

[0023] In this application, a large hole is provided at the hinge point between the right end of the rack drive rod 6 and the rack 7. During braking, because the large hole is too large, its lower edge does not contact the rack 7 and does not push the rack 7 upward. Therefore, the rotation of the external gear 9 is entirely achieved by the push of the brake clamp 3. Thus, the existence of this application does not affect the normal braking of the linkage mechanism. However, when releasing the brake, the upper edge of the large hole contacts the rack 7 and pushes the rack 7 downward. Therefore, the rotation of the external gear 9 is partly driven by the rack 7. Thus, this application has the function of forcibly separating the two brake clamps 3 when releasing the brake.

[0024] In summary, this application ensures that the two brake clamps 3 are tightened evenly during pumping unit braking, preventing uneven force application. Furthermore, this application forcibly separates the brake clamps 3 during pumping unit release, preventing the brake clamps 3 from becoming stuck and difficult to separate.

Claims

1. A linkage mechanism for a pumping unit's braking mechanism, comprising a brake wheel (1), a brake clamp (3), a brake friction pad (2), a return spring, a spring shaft (10), a fixed frame (11), and a linkage mechanism (4), characterized in that: A mounting bracket is fixedly installed on the gearbox below the brake clamp (3). Two internal gears (8) and two external gears (9) are mounted on the mounting bracket. A rack (7) is positioned between the two internal gears (8). The rack (7) meshes with the two internal gears (8) on both sides, and each internal gear (8) meshes with one external gear (9). Thus, the movement of the rack (7) directly drives the two internal gears (8) to rotate in opposite directions and indirectly drives the two external gears (9) to rotate in opposite directions. The lower end face of each brake clamp (3) is equipped with spur teeth (301). Two external gears (9) mesh with the spur teeth (301) of the two brake clamps (3) respectively, so that the reverse rotation of the two external gears (9) drives the two brake clamps (3) to open or close. A rack drive rod (6) is provided below the rack (7). The rack drive rod (6) is pivotally connected to the gearbox. One end of the rack drive rod (6) is hinged to the vertical rod of the linkage mechanism (4), and the other end of the rack drive rod (6) is hinged to the lower end of the rack (7).

2. A linkage cooperation mechanism of a brake mechanism of a pumping unit according to claim 1, characterized in that: A centralizing cylinder (5) is fixedly installed on the pumping unit frame below the rack (7), and the lower part of the rack (7) is slidably installed inside the centralizing cylinder (5).

3. A linkage cooperation mechanism of a brake mechanism of a pumping unit according to claim 1, characterized in that: The two internal gears (8), the two external gears (9), and the rack (7) are all made of stainless steel.

4. A linkage cooperation mechanism of a pumping unit brake mechanism according to claim 2, characterized in that: A sliding bearing is provided between the straightening cylinder (5) and the rack (7).

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