A beam pumping unit safety device

Abstract

The present application relates to a kind of beam pumping unit safety device, including the brake wheel disc rotating area outside brake actuator assembly, brake actuator assembly includes base, with the sliding fit of base safety pin and the brake actuator connected with base, the sliding direction of safety pin points to the edge that brake wheel disc is opened with safety pin slot, brake actuator includes the swing arm that is hinged with base and the rod body that is hinged between swing arm and safety pin, swing arm and base between still be equipped with for locking the swing angle of swing arm limit component, to control the sliding distance of safety pin towards brake wheel disc.It can avoid the safety accident that appears when operating personnel enters crank rotation area, and the position of locking nut is stably locked, reduce security risk, operation is flexible and convenient.

Description

Technical Field

[0001] This invention relates to the field of safety devices for oil pumping units, and more particularly to a safety device for a beam-type oil pumping unit. Background Technology

[0002] As oilfield development progresses, mechanical pumping has gradually replaced reservoir-powered self-flowing production, with beam pumping units becoming the most commonly used mechanical pumping equipment. As reservoir energy levels decrease, the number of beam pumping units in use is increasing year by year. However, it has become increasingly apparent that some operations of these pumping units pose high safety risks and are prone to accidents. Specific issues identified are as follows:

[0003] I. Problems with Shutdown Operations: Operating procedures and safety regulations require that after the pumping unit is stopped, the safety pin of the deadbolt must be engaged in the safety pin groove of the pumping unit's brake disc hub to prevent safety accidents caused by the handbrake not being tightened or malfunctioning. However, the brake disc only has multiple evenly spaced safety pin grooves around its rim. When the pumping unit stops, the safety pin is often not yet aligned with the hub's safety pin groove. Therefore, the operator needs to manually place the safety pin on the hub and slowly release the handbrake to rotate the pumping unit hub, allowing the safety pin to fall into the hub's safety pin groove. However, this manual operation poses a safety hazard of brake failure.

[0004] II. Problems during startup: Before starting the pumping unit, the safety pin needs to be removed from the hub. When removing the safety pin, the operator needs to place his upper body in the crank rotation area to remove the safety pin, which poses a risk of falling over.

[0005] If the safety pin gets stuck, the operator needs to enter the crank rotation area and use tools to pry the safety pin out of the hub safety pin slot, or remove the limit nut on the fixed shaft and knock out the safety pin, and then reinstall the limit nut. If the pumping unit handbrake is not tightened, or if there is knocking or vibration during operation, the pumping unit handbrake may fail. When personnel are in the equipment rotation area, the sudden rotation of the brake disc can easily lead to a safety accident. Summary of the Invention

[0006] This invention addresses the safety issue that can easily occur when operators adjust the safety pin during the start-up or shutdown of an oil pumping unit. It provides a walking beam type oil pumping unit safety device to solve this technical problem, prevent operators from entering the crank rotation area and causing safety accidents, and offers flexible and convenient operation.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0008] A safety device for a beam pumping unit includes a brake actuator assembly located outside the rotation area of ​​a brake disc. The brake actuator assembly includes a base, a safety pin that slides with the base, and a brake actuator connected to the base. The sliding direction of the safety pin points towards the edge of the brake disc where a safety pin groove is formed. The brake actuator includes a swing arm hinged to the base and a rod hinged between the swing arm and the safety pin. A limiting component for locking the swing angle of the swing arm is also provided between the swing arm and the base to control the sliding distance of the safety pin toward the brake disc.

[0009] Preferably, the limiting component includes a ratchet connected to the base and a pawl that engages with the ratchet's tooth groove. The axis of the ratchet coincides with the rotation axis of the swing arm. The pawl slides in a controlled manner along the length of the swing arm, and the tip of the pawl points to the edge of the ratchet where the tooth groove is located.

[0010] Preferably, the pawl is located above the ratchet, and the tip of the pawl is located at the lower part of the pawl.

[0011] Preferably, the limiting assembly further includes a handle hinged to the swing arm and a hinge rod hinged between the handle and the pawl, wherein the axes of the hinges between the handle, the swing arm, and the hinge rod do not coincide.

[0012] Preferably, the handle is adapted to switch between a first state in which the pawl is inserted into the ratchet tooth groove and a second state in which the pawl is disengaged from the ratchet tooth groove, and the limiting component further includes a latch for locking the handle in the first state.

[0013] Preferably, the latch includes a body movably connected to the swing arm, the body being connected to a hook for locking the handle.

[0014] Preferably, the sliding direction of the safety pin is perpendicular to the axis of the brake disc.

[0015] Preferably, the base is further provided with a return spring for driving the safety pin to slide toward the brake disc.

[0016] Preferably, the base includes a cylindrical body fitted around the outside of the safety pin, with an annular space between the cylindrical body and the safety pin to accommodate a return spring, and both ends of the cylindrical body being in close contact with the side of the safety pin.

[0017] Preferably, the safety pin includes a first pin segment and a second pin segment located at both ends. The first pin segment is located at the end closer to the brake disc, and the side of the second pin segment is threaded and threadedly connected to a nut for limiting the sliding distance of the safety pin toward the brake disc.

[0018] Preferably, the nut has a handle attached to its side.

[0019] Preferably, the edge of the safety pin at the end pointing towards the brake disc is provided with a guide slope.

[0020] Preferably, the base further includes a connecting plate bolted to the gearbox housing of the pumping unit, wherein the connecting plate is bolted to the gearbox housing of the pumping unit by at least two bolts, and the length direction of the bolts is perpendicular to the sliding direction of the safety pin.

[0021] The beneficial technical effects of the present invention are as follows:

[0022] (i) The brake actuator assembly includes a base, a safety pin that slides with the base, and a brake actuator for controlling the sliding of the safety pin. The brake actuator assembly is installed outside the rotation area of ​​the brake disc, which can reduce the risk to the operator and prevent the operator from entering the crank rotation area and causing safety accidents. Moreover, the brake actuator includes a swing arm that is hinged to the base and a rod that is hinged between the swing arm and the safety pin. The operator can easily control the back-and-forth sliding of the safety pin by moving the swing arm, making the operation flexible and convenient.

[0023] (ii) The limiting component, through the cooperation of ratchet and pawl, can lock the swing angle of the swing arm and control the distance of the safety pin sliding toward the brake disc. This can prevent the safety pin from being inserted into the brake disc during the operation of the pumping unit. According to the characteristics of the ratchet tooth groove, after the pawl is inserted into one tooth groove of the ratchet, the pawl and the ratchet can also rotate in one direction, so that the safety pin is away from the brake disc, which makes it easy to release the lock on the brake disc in an emergency.

[0024] (iii) The pawl is located above the ratchet, and the tip of the pawl is located at the bottom of the pawl. When there is no external force, the pawl will fall down and insert into the tooth groove of the ratchet to ensure the stable locking of the safety pin.

[0025] (iv) The base is equipped with a return spring that drives the safety pin to slide towards the brake disc. The return spring automatically pushes the safety pin into the safety pin slot of the brake disc. When the safety pin is not aligned with the safety pin slot of the brake disc, the return spring can press the safety pin against the edge of the brake disc where the safety pin slot is located. At this time, when the pumping unit brake disc is controlled, when the safety pin is aligned with the safety pin slot of the brake disc, the return spring can push the safety pin into the safety pin slot of the brake disc. Since the operator does not need to manually adjust the position of the safety pin, it helps to reduce the occurrence of accidents.

[0026] (v) The safety pin includes a first pin section and a second pin section located at both ends. The first pin section is located at the end closest to the brake disc. The side of the second pin section is threaded and threaded with a nut for limiting the sliding distance of the safety pin toward the brake disc. When the nut abuts against the cylinder, it can lock the sliding distance of the safety pin toward the brake disc.

[0027] On the other hand, when the first section of the safety pin is stuck in the safety pin groove, the safety pin can be pulled out of the safety pin groove by controlling the nut to be screwed into the cylinder and using the force of the cylinder on the nut, which is convenient for use. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of the safety device for the walking beam pumping unit in an embodiment of the present invention is shown;

[0029] Figure 2 It shows Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 A cross-sectional view of the safety device for a beam pumping unit according to an embodiment of the present invention is shown.

[0031] Marked in the attached diagram:

[0032] 1-Base; 11-Connecting plate; 111-Bolt; 12-Cylinder; 121-Annular cavity; 122-Reset spring; 2-Brake actuator; 21-Swing arm; 21-Rod; 22-Limit assembly; 221-Ratchet; 222-Pawl; 223-Handle; 224-Hinged rod; 23-Lock; 231-Body; 232-Hook; 3-Safety pin; 31-First pin segment; 311-Conical end; 32-Second pin segment; 321-Plate; 322-Nut; 4-Brake disc; 41-Safety pin groove. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the following detailed description of a beam pumping unit safety device proposed by this invention, in conjunction with the accompanying drawings and specific embodiments, will provide further clarity. The advantages and features of this invention will become clearer from the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, used only to facilitate and clearly illustrate the purpose of the embodiments of this invention. Please refer to the accompanying drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention.

[0034] Example

[0035] The following will be combined with the appendix Figures 1 to 3 The technical solution of a walking beam pumping unit safety device of the present invention is described in detail with specific embodiments.

[0036] like Figures 1 to 3 As shown, a safety device for a beam pumping unit in this embodiment includes a brake actuator assembly located outside the rotation area of ​​the brake disc 4. The brake actuator assembly includes a base 1, a safety pin 3 that slides with the base 1, and a brake actuator 2 connected to the base 1. The sliding direction of the safety pin 3 points towards the edge of the brake disc 4 where a safety pin groove 41 is formed. The brake actuator 2 includes a swing arm 21 hinged to the base 1 and a rod 21 hinged between the swing arm 21 and the safety pin 3. A limiting component 22 for locking the swing angle of the swing arm 21 is also provided between the swing arm 21 and the base 1 to control the sliding distance of the safety pin 3 toward the brake disc 4. The brake actuator 2 drives the safety pin 3 to slide toward the edge of the brake disc 4 where the safety pin groove 41 is formed. When the brake disc 4 rotates until the safety pin 3 is aligned with the safety pin groove 41, the safety pin 3 can be inserted into the safety pin groove 41 to lock the brake disc 4. It should be understood that the brake actuator 2 can also be directly selected from linear drive components, such as linear motors, pneumatic cylinders, or hydraulic cylinders.

[0037] Specifically, the base 1 includes a connecting plate 11 and a cylinder 12, which are welded together. The connecting plate 11 is bolted to the gearbox housing of the pumping unit, and the cylinder 12 is fitted over the safety pin 3 to guide its sliding. The connecting plate 11 is bolted to the gearbox housing of the pumping unit by at least two bolts 111, the length direction of which is perpendicular to the sliding direction of the safety pin 3, thereby stably mounting the base 1 on the outside of the gearbox housing. In this embodiment, only two bolts 111 are used, but it should be understood that the number of bolts 111 can be increased. In actual use, the appropriate number of bolts 111 can be selected according to the strength requirements.

[0038] During the operation of the pumping unit, the safety pin 3 could accidentally slide towards the brake disc 4 and insert into the safety pin groove 41, posing a significant hazard. Therefore, it is necessary to prevent this from happening. The purpose of the limiting component 22 in this embodiment is to lock the swing angle of the swing arm 21, thereby preventing the safety pin 3 from accidentally inserting into the safety pin groove 41. The limiting component 22 in this embodiment includes a ratchet 221 connected to the base 1 and a pawl 222 that engages with the tooth groove of the ratchet 221. The axis of the ratchet 221 coincides with the rotation axis of the swing arm 21. The pawl 222 slides controlled along the length of the swing arm 21, and the tip of the pawl 222 points to the edge of the ratchet 221 where the tooth groove is located. By controlling the pawl 222 to slide into the tooth groove of the ratchet 221, the swing angle of the swing arm 21 can be locked.

[0039] Two sleeves with overlapping axes are welded to the side of the swing arm 21. The pawl 222 passes through the two sleeves and slides under the guidance of the sleeves.

[0040] Based on the characteristics of the tooth groove of ratchet 221, after pawl 222 is inserted into one tooth groove of ratchet 221, pawl 222 and ratchet 221 can still rotate relative to each other in one direction. Since this solution needs to prevent the safety pin 3 from accidentally sliding towards the brake disc 4, when pawl 222 is inserted into the tooth groove of ratchet 221, the swing angle of the locking arm 21 is used to prevent the safety pin 3 from accidentally sliding towards the brake disc 4, but it does not prevent the safety pin 3 from moving away from the brake disc 4, which makes it easy to release the lock on the brake disc 4 in an emergency.

[0041] Specifically, in this solution, the pawl 222 of the swing arm 21 is located above the ratchet 221, and the tip of the pawl 222 is located at the lower part of the pawl 222. When there is no external force, the pawl 222 will fall down and insert into the tooth groove of the ratchet 221 to ensure stable locking of the position of the safety pin 3.

[0042] Furthermore, the limiting component 22 also includes a handle 223 hinged to the swing arm 21 and a hinge rod 224 hinged between the handle 223 and the pawl 222. The handle 223 is located above the pawl 222, and the hinge axes between the handle 223, the swing arm 21, and the hinge rod 224 are not coincident. The handle 223 can be used to drive the pawl 222 to slide into or out of the tooth groove of the ratchet 221. It should be understood that the limiting component 22 can also directly use other linear drive components that drive the pawl 222 to slide, such as a linear motor, pneumatic cylinder, or hydraulic cylinder. However, the handle 223 is simple, reliable, and low-cost to operate, and the operator can directly adjust the handle 223 on-site to control the movement of the pawl 222.

[0043] The handle 223 is hinged to the swing arm 21. During the rotation of the handle 223, it can switch between a first state in which the pawl 222 is inserted into the groove of the ratchet 221 and a second state in which the pawl 222 is disengaged from the groove of the ratchet 221.

[0044] The limiting component 22 also includes a latch 23 for locking the handle 223 in the first state. By locking the handle 223 in the first state using the limiting component 22, the position of the pawl 222 can be completely locked. The latch 23 includes a body 231 that is movably connected to the swing arm 21. The body 231 is connected to a hook 232 for locking the handle 223. When the handle 223 is rotated to the first state, the hook 232 of the latch 23 hooks the handle 223, preventing the handle 223 from rotating to the second state.

[0045] The specific relationship between cylinder 12 and safety pin 3 is as follows:

[0046] The cylinder 12 is fitted over the safety pin 3, and the length of the cylinder 12 is shorter than the length of the safety pin 3. An annular groove is formed on the inner wall of the cylinder 12, and an annular cavity 121 is formed between the groove wall and the safety pin 3. An annular protrusion is located on the outer side of the safety pin 3 within the annular cavity 121. A compressed return spring 122 is installed within the annular cavity 121, with one end of the return spring 122 abutting against the groove wall and the other end abutting against the annular protrusion of the safety pin 3.

[0047] The return spring 122 is used to drive the safety pin 3 towards the brake disc 4. The return spring 122 can automatically push the safety pin 3 into the safety pin groove 41 of the brake disc 4. When the safety pin 3 is not aligned with the safety pin groove 41 of the brake disc 4, the return spring 122 can cause the safety pin 3 to press against the edge of the brake disc 4 where the safety pin groove 41 is located. Then, by controlling the pumping unit brake disc 4, when the safety pin 3 is aligned with the safety pin groove 41 of the brake disc 4, the return spring 122 can push the safety pin 3 into the safety pin groove 41 of the brake disc 4. Since the operator does not need to manually adjust the position of the safety pin 3, it helps to reduce the occurrence of accidents. However, when using the return spring 122 to push the safety pin 3 towards the safety pin groove 41 of the brake disc 4, it is necessary to first control the limit component 22 to release the lock on the safety pin 3, allowing the safety pin 3 to slide freely.

[0048] Both ends of the cylinder 12 are in close contact with the side of the safety pin 3, thereby stably guiding the safety pin 3 to slide along the axis of the cylinder 12. In this embodiment, the axis of the cylinder 12 is parallel to the sliding direction of the safety pin 3, while the axis of the cylinder 12 and the sliding direction of the safety pin 3 are perpendicular to the axis of the brake disc 4.

[0049] In this embodiment, the safety pin 3 includes a first pin segment 31 and a second pin segment 32 located at both ends. The first pin segment 31 is a segment close to the brake disc 4. The end of the second pin segment 32 away from the first pin segment 31 is connected to a plate 321 and is hinged to the rod 21 through the plate 321.

[0050] The second pin segment 32 is also threaded on its side and threadedly connected to a nut 322 for limiting the sliding distance of the safety pin 3 toward the brake disc 4. When the nut 322 abuts against the cylinder 12, it can prevent the safety pin 3 from sliding toward the brake disc 4, thereby locking the sliding distance of the safety pin 3 toward the brake disc 4. On the other hand, when the first pin segment 31 of the safety pin 3 is stuck in the safety pin groove 41, by controlling the nut 322 to screw into the cylinder 12, the force of the cylinder 12 on the nut 322 can be used to pull the safety pin 3 out of the safety pin groove 41, making it convenient to use.

[0051] In this design, a handle is also connected to the side of nut 322, allowing the operator to easily control the rotation of nut 322 using the handle.

[0052] The edge of the safety pin 3 pointing towards the brake disc 4 is provided with a guide slope, so that the end of the safety pin 3 pointing towards the brake disc 4 forms a tapered end 311. When the safety pin 3 is inserted into the safety pin groove 41 of the brake disc 4, if a jamming problem occurs, the tapered end 311 makes it easier for the safety pin 3 to be removed and released.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A safety device for a beam pumping unit, characterized in that, The system includes a brake actuator assembly located outside the rotation area of ​​the brake disc. The brake actuator assembly includes a base, a safety pin that slides with the base, and a brake actuator connected to the base. The sliding direction of the safety pin points towards the edge of the brake disc where a safety pin groove is formed. The brake actuator includes a swing arm hinged to the base and a rod hinged between the swing arm and the safety pin. A limiting component for locking the swing angle of the swing arm is also provided between the swing arm and the base to control the sliding distance of the safety pin toward the brake disc.

2. The safety device for a beam pumping unit as described in claim 1, characterized in that, The limiting component includes a ratchet connected to the base and a pawl that engages with the ratchet's tooth groove. The axis of the ratchet coincides with the rotation axis of the swing arm. The pawl slides in a controlled manner along the length of the swing arm, and the tip of the pawl points to the edge of the ratchet where the tooth groove is located.

3. The safety device for a beam pumping unit as described in claim 2, characterized in that, The pawl is located above the ratchet, and the tip of the pawl is located at the bottom of the pawl.

4. A safety device for a beam pumping unit as described in claim 2, characterized in that, The limiting assembly also includes a handle hinged to the swing arm and a hinge rod hinged between the handle and the pawl, wherein the axes of the hinges between the handle, the swing arm, and the hinge rod do not coincide.

5. A safety device for a beam pumping unit as described in claim 4, characterized in that, The handle is adapted to switch between a first state in which the pawl is inserted into the ratchet tooth groove and a second state in which the pawl is disengaged from the ratchet tooth groove, and the limiting component further includes a latch for locking the handle in the first state.

6. A safety device for a beam pumping unit as described in claim 5, characterized in that, The latch includes a body movably connected to the swing arm, and the body is connected to a hook for locking the handle.

7. A safety device for a beam pumping unit as described in claim 1, characterized in that, The sliding direction of the safety pin is perpendicular to the axis of the brake disc.

8. A safety device for a beam pumping unit as described in claim 1, characterized in that, The base is also provided with a return spring for driving the safety pin to slide toward the brake disc.

9. A safety device for a beam pumping unit as described in claim 8, characterized in that, The base includes a cylindrical body fitted around the outside of the safety pin, with an annular space between the cylindrical body and the safety pin to accommodate a return spring, and both ends of the cylindrical body being in close contact with the side of the safety pin.

10. A safety device for a beam pumping unit as described in claim 9, characterized in that, The safety pin includes a first pin segment and a second pin segment located at both ends. The first pin segment is located at the end closer to the brake disc, and the side of the second pin segment is threaded and threadedly connected to a nut for limiting the sliding distance of the safety pin toward the brake disc.

11. A safety device for a beam pumping unit as described in claim 10, characterized in that, A handle is attached to the side of the nut.

12. A safety device for a beam pumping unit as described in claim 1, characterized in that, The edge of the safety pin pointing towards the brake disc has a guide slope.

13. A safety device for a beam pumping unit as described in claim 1, characterized in that, The base also includes a connecting plate bolted to the gearbox housing of the pumping unit. The connecting plate is bolted to the gearbox housing of the pumping unit by at least two bolts, and the length direction of the bolts is perpendicular to the sliding direction of the safety pin.

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