Eccentric adjusting mechanism for safety lock hook of beam-pumping unit
By designing an eccentric adjustment mechanism on the beam pumping unit, the problems of high operational difficulty and safety risks caused by the tight engagement of the locking hooks were solved, and the convenient separation of the safety locking hooks and the improvement of safety were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DAQING OILFIELD CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-17
AI Technical Summary
The locking hooks of existing beam pumping units are tightly engaged during the stopping process, making them difficult to open and posing a safety risk.
Design a safety lock hook eccentric adjustment mechanism for a beam pumping unit. By setting an eccentric adjustment mechanism on a fixed shaft, the safety lock hook is eccentrically arranged with the brake hub. The contact gap is changed by rotating the eccentric adjustment mechanism to facilitate the separation of the safety lock hook.
It reduces the difficulty of opening the lock hook, improves safety, and avoids the safety risks of using a crowbar or hammer.
Smart Images
Figure CN224134623U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of oil pumping unit lifting process equipment, and in particular to an eccentric adjustment mechanism for a walking beam oil pumping unit safety locking hook. Background Technology
[0002] In oilfield production, to prevent slippage when braking a beam pumping unit, a locking hook is typically used to engage with the pumping unit's hub. The two engage in mutual resistance, preventing hub slippage and thus stopping the pumping unit. While existing technologies can use locking hooks to stop the pumping unit and enhance stopping effectiveness and braking safety by installing brake plates and tightening structures, the tight fit between the hook and hub during stopping necessitates using a pry bar or hammering to release the locking hook. This process is difficult and poses safety risks due to the significant impact force required. Therefore, to address these shortcomings, a safety locking hook eccentricity adjustment mechanism for beam pumping units is proposed. Summary of the Invention
[0003] The purpose of this invention is to provide a safety lock hook eccentric adjustment mechanism for a beam pumping unit, so as to overcome the defects in the prior art where the lock hook is difficult to open and poses a safety risk due to the tight fit between the two when stopping the pumping unit.
[0004] To achieve the above objectives, this utility model provides a safety lock hook eccentric adjustment mechanism for a beam pumping unit, comprising:
[0005] A ring-shaped brake hub is installed at the end of the pumping unit drive shaft. A brake mechanism is provided outside the brake hub. The brake mechanism includes two brake pads of the same shape but opposite directions. The ends of the two brake pads are mounted on the same fixed shaft to form a ring-shaped opening and closing structure.
[0006] An eccentric adjustment mechanism is provided on the fixed shaft inside the brake pad. The eccentric adjustment mechanism is provided with a safety lock hook. The safety lock hook is hinged to the eccentric adjustment mechanism and the hinge position is eccentrically arranged between the fixed shaft and the fixed shaft.
[0007] The safety lock hook is provided with locking teeth that protrude towards the brake hub and engage with the side wall of the brake hub.
[0008] Preferably, the eccentric adjustment mechanism is annular, with a through hole in the axial direction that cooperates with the fixed shaft. The outer wall thickness of the eccentric adjustment mechanism is uneven, and the top hinge position of the safety lock hook is located at the bottom end where the outer wall thickness of the eccentric adjustment mechanism is the greatest.
[0009] Preferably, the eccentric adjustment mechanism is provided with a vertically upward adjustment handle.
[0010] Preferably, in the braking mechanism, a brake pin is provided at the point where the two brake pads are not connected to the fixed shaft. The right end of the brake pin passes through the bottom end of the two brake pads and is fixedly connected to the brake pad on the right side. The left end of the brake pin is provided with a brake crank arm that presses the brake pad on the left side to the right and pulls the brake pad on the right side to the left at the same time.
[0011] Preferably, the right end of the brake crank arm is cam-shaped and hinged to the left end of the brake pin, and the protrusion of the cam contacts the outer wall of the left brake pad.
[0012] Preferably, the brake pin is provided with a return spring, which is located between the two brake pads, with its left and right ends respectively contacting the inner walls of the left and right brake pads.
[0013] Preferably, the tail of the safety hook lock is provided with a connecting rod, which is connected to the on-site operating handle.
[0014] The eccentric adjustment mechanism for the safety locking hook of a beam pumping unit provided by this utility model has the following beneficial effects:
[0015] The eccentric adjustment mechanism for the safety lock hook of the beam pumping unit provided by this utility model is formed by setting an eccentric adjustment mechanism on a fixed shaft and connecting one end of the safety lock hook to the eccentric adjustment mechanism to form an eccentric arrangement between the safety lock hook and the fixed shaft. After the safety lock hook engages and makes close contact with the brake drum, rotating the eccentric adjustment mechanism around the fixed shaft can change the contact gap between the safety lock hook and the brake drum, thereby removing the safety lock hook. The safety lock hook can be removed without using a pry bar or hammer, reducing the difficulty of operating the device and improving safety. Attached Figure Description
[0016] Figure 1 Structural diagram of the eccentric adjustment mechanism for the safety locking hook of a beam pumping unit;
[0017] Figure 2 This is a partial structural diagram of the eccentric adjustment mechanism for the safety locking hook of a beam pumping unit.
[0018] Legend:
[0019] 1. Eccentric adjustment mechanism; 2. Safety lock hook; 3. Linkage rod; 4. Brake crank arm; 5. Brake pad; 6. Brake drum; 7. Return spring; 8. Brake pin; 9. Fixed shaft. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] like Figure 1-2 As shown, the present invention provides a safety locking hook eccentric adjustment mechanism for a beam pumping unit, comprising:
[0022] A ring-shaped brake hub 6 is installed at the end of the pumping unit's drive shaft. A braking mechanism is provided outside the brake hub 6, comprising two identical but oppositely oriented brake pads 5. The ends of the two brake pads 5 are mounted on the same fixed shaft 9, forming a ring-shaped opening and closing structure. During operation, the brake hub 6 rotates synchronously with the pumping unit's drive shaft. Similarly, during pumping unit operation, braking the brake hub 6 is sufficient to drive the connected pumping unit's drive shaft to rotate, thus achieving braking of the pumping unit. By mounting the ends of the two brake pads 5 on the same fixed shaft 9, it is ensured that the brake pads 5 gradually form a ring around the brake hub 6 when engaged, while simultaneously reducing installation costs and simplifying the device's structure.
[0023] The brake hub 6 is equipped with a braking mechanism, which works in conjunction with the brake hub 6 to decelerate and brake the drive shaft of the pumping unit. Normally, the braking mechanism contacts and gradually presses against the rotating brake hub 6. As the braking mechanism presses closer, the friction between the brake hub 6 and the braking mechanism increases, causing the rotating brake hub 6 to gradually decelerate until it stops rotating. Simultaneously, because the brake hub 6 is connected to the drive shaft of the pumping unit, it drives the pumping unit to gradually decelerate until it stops rotating, thus achieving the braking function of the pumping unit.
[0024] It should be noted that the braking mechanism includes two brake pads 5 of the same shape but opposite orientation. The ends of the two brake pads 5 are mounted on the same fixed shaft 9 to form a ring-shaped opening and closing structure. Normally, the brake hub 6 is located between the two brake pads 5. After the two brake pads 5 are fastened together on the outside of the brake hub 6 to form a ring-shaped opening and closing structure, the two brake pads 5 are clamped together, so that the inner wall of the brake pads 5 gradually contacts and clamps the outer wall of the brake hub 6. This gradually increases the friction between the brake pads 5 and the brake hub 6, causing the brake hub 6 to drive the pumping unit to gradually stop, thereby realizing the braking function of the pumping unit.
[0025] In this invention, an eccentric adjustment mechanism 1 is provided on the fixed shaft 9 inside the brake pad. The eccentric adjustment mechanism 1 is equipped with a safety hook 2, which is hinged to the eccentric adjustment mechanism 1, with the hinge position eccentrically positioned relative to the fixed shaft 9. After the pumping unit brakes, to prevent the pumping unit from sliding and injuring workers during braking, the safety hook 2 is typically used to lock the position of the brake hub 6 in place, thus preventing the pumping unit from sliding after braking and endangering the health and safety of workers, thereby improving the safety of the device operation. The safety hook 2 has locking teeth protruding towards one side of the brake hub 6, and these teeth engage with the side wall of the brake hub 6. After the brake pads 5 clamp the brake drum 6 to achieve the braking of the pumping unit, the safety hook lock 2 is pressed down so that the locking teeth on the side wall of the safety hook lock 2 engage with the side wall of the brake drum 6. At this time, the locking teeth are in close contact with the side wall of the brake drum 6. When the brake drum 6 is about to rotate and slide under the drive of the pumping unit drive shaft, the brake drum 6 contacts the safety hook 2. The locking teeth of the safety hook 2 hold the brake drum 6 against and prevent the brake drum 6 from rotating, thereby locking the brake drum 6 and preventing the pumping unit from sliding after braking.
[0026] The eccentric adjustment mechanism 1 is located on the fixed shaft 9 and is used to install the safety hook 2 on the fixed shaft 9 while simultaneously eccentrically arranging the safety hook 2 and the fixed shaft 9. After the safety hook 2 engages with the side wall of the brake drum 6 to fix the position of the brake drum 6, when the maintenance work is completed and the pumping unit needs to be restored to its working state, the safety hook 2 needs to be lifted to separate the locking teeth of the safety hook 2 from the brake drum 6. However, under pressure, the brake drum 6 and the locking teeth of the safety hook 2 are in close contact, making separation extremely difficult. At this time, the eccentric adjustment mechanism 1 is rotated around the fixed shaft 9 in the same direction as the force on the locking teeth of the safety hook 2, thereby causing the entire safety hook 2 to move in the direction of the force on the locking teeth. At this time, the contact space between the locking teeth and the brake drum 6 increases, and the locking teeth separate from the brake drum 6, disengaging the engagement. Then, the safety hook 2 can be lifted to separate it from the brake drum 6. With the eccentric adjustment mechanism 1, it is not necessary to use a pry bar to pry or strike the safety hook 2 to separate the safety hook 2 from the brake drum 6, which reduces the difficulty of separating and resetting the safety hook 2 from the brake drum 6 and improves the safety during operation.
[0027] The eccentric adjustment mechanism 1 is equipped with a vertically upward adjustment handle. Workers can rotate the eccentric adjustment mechanism 1 around the fixed axis 9 using the adjustment handle, improving work efficiency and reducing workload and difficulty when adjusting the direction of the eccentric adjustment mechanism 1.
[0028] It is important to note that, such as Figure 2As shown, the eccentric adjustment mechanism 1 is annular, with an axial through hole that mates with the fixed shaft 9. The outer wall thickness of the eccentric adjustment mechanism 1 is uneven, and the hinge position of the top of the safety hook 2 is located at the bottom end where the outer wall thickness of the eccentric adjustment mechanism 1 is the greatest. The cross-sectional shape of the eccentric adjustment mechanism 1 is similar to that of a cam. The center of the lower half of the cam has a through hole for passing through and connecting with the fixed shaft 9. The hinge position of the eccentric adjustment mechanism 1 and the safety hook 2 is located in the upper half of the cam, thereby realizing the eccentric arrangement of the safety hook 2 and the fixed shaft 9 through the eccentric adjustment mechanism 1, and the relative position of the safety hook 2 and the brake drum 6 can be adjusted by rotating the eccentric adjustment mechanism 1 around the fixed shaft 9.
[0029] In addition, the tail of the safety hook lock 2 is equipped with a connecting rod 3, which is connected to the on-site operating handle. Operators can directly control the working state and position of the safety hook lock 2 through the on-site operating handle and the transmission of the connecting rod 3, without needing to climb above the pumping unit to operate the safety hook lock 2, thus improving the safety of the device.
[0030] like Figure 1 As shown, within the braking mechanism, a brake pin 8 is provided where the two brake pads 5 are not connected to the fixed shaft 9. The right end of the brake pin 8 passes through the bottom ends of the two brake pads 5 and is fixedly connected to the right brake pad 5. The left end of the brake pin 8 is provided with a brake crank arm 4 that presses the left brake pad to the right while simultaneously pulling the right brake pad to the left. During braking, the brake crank arm 4 pushes the left brake pad 5 to the right along the brake pin 8, bringing the two brake pads 5 closer together and gradually clamping the brake drum 6 located between the two brake pads 5. This achieves braking of the brake drum 6 by controlling the braking mechanism through the cooperation of the brake crank arm 4 and the brake pin 8.
[0031] The right end of the brake crank arm 4 is cam-shaped and hinged to the left end of the brake pin 8. The protrusion of the cam contacts the outer wall of the left brake pad 5. By making the right end of the brake crank arm 4 cam-shaped and contacting the left brake pad 5, during braking, only the left end of the brake crank arm 4 needs to be pressed down. At this time, the protrusion of the right end of the brake crank arm 4 gradually pushes the brake pad 5 to the right while in contact with the left brake pad 5. At the same time, based on the lever principle, the force required to brake the pumping unit by pressing down the brake crank arm 4 is much less than that required to directly push the two brake pads 5 together, reducing the workload and difficulty of the braking operation.
[0032] It should be noted that the brake pin 8 is equipped with a return spring 7, which is located between the two brake pads 5, with its left and right ends contacting the inner walls of the left and right brake pads 5 respectively. After braking, the return spring 7, under its own elastic force, will push the two brake pads 5 apart, thereby assisting the two brake pads 5 in returning to their original positions and reducing the difficulty and workload of the return process.
[0033] Combination Figure 1 The following describes in detail the working steps of the safety lock hook eccentric adjustment mechanism of this type of beam pumping unit:
[0034] First, the staff pulls down the brake lever to stop the pumping unit. At this time, the two brake pads move closer to each other and clamp the brake hub inward under the push of the brake lever. Through friction, the rotation speed of the brake hub is gradually slowed down until the brake hub drives the pumping unit drive shaft to stop rotating, thus stopping the unit.
[0035] Then, pull the on-site operating handle to control the safety lock hook to lock the brake drum. Through the transmission of the linkage, the operator pulls the safety hook lock downwards and engages the locking teeth of the safety hook lock with the side wall of the brake drum. After the two are in close contact, the locking teeth engage with the brake drum to prevent the brake drum from rotating, thereby achieving the locking of the pumping unit.
[0036] After the on-site work is completed, rotate the eccentric adjustment mechanism and lift the safety lock hook to reset it. After rotating the eccentric adjustment mechanism in the direction of the force on the locking teeth, the safety lock hook moves accordingly, increasing the contact gap between the locking teeth and the brake drum. At this time, lifting the safety lock hook will cause the locking teeth to separate from the brake drum, releasing the locking state of the pumping unit.
[0037] Finally, the brake lever is lifted to reset the device. When the brake lever is lifted, the two brake pads separate from each other under the action of the reset spring, no longer pressing against the brake drum, thus completing the pumping unit reset.
[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A walking beam pumping unit safety hook eccentric adjustment mechanism characterized by, include: A ring-shaped brake hub (6) is installed at the end of the pumping unit drive shaft. A brake mechanism is provided outside the brake hub (6). The brake mechanism includes two brake pads (5) with the same shape and opposite directions. The ends of the two brake pads (5) are installed on the same fixed shaft (9) to form a ring-shaped opening and closing structure. An eccentric adjustment mechanism (1) is provided on the inner side of the brake pad on the fixed shaft (9). A safety lock hook (2) is provided on the eccentric adjustment mechanism (1). The safety lock hook (2) is hinged to the eccentric adjustment mechanism (1) and the hinge position is eccentrically arranged between the fixed shaft (9). The safety hook (2) is provided with locking teeth that protrude toward the brake hub (6) and engage with the side wall of the brake hub (6).
2. The safe hook eccentric adjustment mechanism for a beam-type pumping unit according to claim 1, characterized in that, The eccentric adjustment mechanism (1) is ring-shaped and has a through hole in the axial direction that matches the fixed shaft (9). The outer wall thickness of the eccentric adjustment mechanism (1) is uneven, and the top hinge position of the safety lock hook (2) is located at the bottom end where the outer wall thickness of the eccentric adjustment mechanism (1) is the largest.
3. The safe hook eccentric adjustment mechanism for a beam-type pumping unit according to claim 2, characterized in that, The eccentric adjustment mechanism (1) is provided with a vertically upward adjustment handle.
4. The safe hook eccentric adjustment mechanism for a beam-type pumping unit according to claim 1, characterized in that, Within the braking mechanism, a brake pin (8) is provided at the point where the two brake pads (5) are not connected to the fixed shaft (9). The right end of the brake pin (8) passes through the bottom end of the two brake pads (5) and is fixedly connected to the brake pad (5) on the right side. The left end of the brake pin (8) is provided with a brake crank arm (4) that presses the left brake pad to the right and pulls the right brake pad to the left at the same time.
5. The safe hook eccentric adjustment mechanism for a beam-type pumping unit as claimed in claim 4, characterized in that, The right end of the brake crank arm (4) is cam-shaped and hinged to the left end of the brake pin (8). The protrusion of the cam contacts the outer wall of the left brake pad (5).
6. The safe hook eccentric adjustment mechanism for a beam-type pumping unit according to claim 4 or 5, characterized in that, The brake pin (8) is provided with a return spring (7), which is located between the two brake pads (5), and its left and right ends are in contact with the inner walls of the left and right brake pads (5) respectively.
7. The safe hook eccentric adjustment mechanism for a beam-type pumping unit according to claim 1, characterized in that, The safety hook (2) is provided with a connecting rod (3) at its tail, and the connecting rod (3) is connected to the on-site operating handle.