Interlocking device of circuit breaker

Abstract

An interlocking device of a circuit breaker belongs to the technical field of switching devices. The circuit breaker comprises a frame, the frame is provided with a plurality of partition plates used for dividing the interior of a shell of the circuit breaker into a plurality of independent areas, an operating mechanism is arranged in the frame, a switch-on and switch-off indicating shaft is rotationally arranged on the partition plates, and the operating mechanism comprises a switch-on half shaft assembly rotationally arranged on the partition plates; the interlocking device comprises a connecting lever connecting rod, a switching-on and switching-off indicating shaft connecting lever and a switching-on half shaft assembly stopping and avoiding connecting lever, one end of the connecting lever connecting rod is connected with the switching-on and switching-off indicating shaft connecting lever, the other end of the connecting lever connecting rod is connected with the switching-on half shaft assembly stopping and avoiding connecting lever, and the switching-on and switching-off indicating shaft connecting lever is fixedly sleeved at the end part. The closing half shaft assembly backstop and the avoiding crank arm are rotatably arranged on the separator plate. The utility model has the advantages of avoiding reducing the strength of related parts, being convenient to install, improving the assembly efficiency and ensuring the assembly quality.

Description

Technical Field

[0001] This utility model belongs to the field of switchgear technology, specifically relating to an interlocking device for a circuit breaker. Background Technology

[0002] The primary purpose of storing energy after closing a high-voltage vacuum circuit breaker is to ensure a rapid response to emergencies, protecting the circuit and electrical facilities. Operating further in this closed state can lead to a series of problems with the transmission mechanism or the entire circuit breaker system. This is because after closing and storing energy, the internal mechanical structure and electrical components of the circuit breaker are in a specific energy storage state. For example, the energy storage spring is compressed or stretched to its storage position to store sufficient energy for the next opening or closing. Directly performing further operations will disrupt this balance, leading to the aforementioned problems. For instance, it may subject the spring to additional stress, causing fatigue, deformation, or even breakage. It may also cause impacts or misalignments to components such as linkages and cranks in the transmission system, affecting the accuracy and reliability of the transmission. Relays and contactors in the control circuit may be in a closed or locked state; operating under these conditions could trigger incorrect control signals, causing the circuit breaker to malfunction or damaging control circuit components, and so on.

[0003] As is known in the industry, the function of the closing interlocking device of a circuit breaker is to prevent misoperation and accidental paralleling during operation, ensuring operational safety and embodying the five-proof function of preventing accidental opening and closing of the circuit breaker, preventing opening under load, and preventing closing of disconnecting switches. However, due to the large number of parts in the closing interlocking device of a circuit breaker, installation is not convenient. Therefore, it is common practice to install some parts by setting sliding grooves. Although this method helps to facilitate installation, the installation method of setting sliding grooves significantly reduces the strength of the parts and affects the reliability of the interlocking. Utility Model Content

[0004] The objective of this invention is to provide an interlocking device for circuit breakers that helps to eliminate the traditional installation method of using grooves to facilitate installation, thereby avoiding the reduction of the strength of related components and improving the assembly efficiency by reflecting the necessary convenience in the installation process.

[0005] The present invention achieves its objective as follows: An interlocking device for a circuit breaker, wherein the circuit breaker includes a frame having several partitions dividing the interior of the circuit breaker housing into several independent regions, and an operating mechanism is disposed within the frame. A closing / opening indicator shaft is rotatably disposed on each partition. The operating mechanism includes a closing half-shaft assembly rotatably disposed on the partition. The interlocking device includes a crank arm connecting rod, a crank arm connecting the closing / opening indicator shaft, and a stop and avoidance crank arm for the closing half-shaft assembly. One end of the crank arm connecting rod is connected to the crank arm connecting the closing / opening indicator shaft, and the other end is connected to the stop and avoidance crank arm for the closing half-shaft assembly. The indicator shaft is fixed to the end of the crank arm, and the closing half-shaft assembly stop and avoidance crank arm is rotatably mounted on the partition plate. When the circuit breaker is in the closed state, the closing half-shaft assembly stop and avoidance crank arm are in the rotation path of the closing half-shaft assembly, making the closing half-shaft assembly unable to rotate and the circuit breaker unable to close. When the circuit breaker is in the open state, the operating mechanism drives the open / close indicator shaft to rotate, and then drives the open / close indicator shaft connecting crank arm to rotate synchronously. Thus, through the crank arm connecting rod, the closing half-shaft assembly stop and avoidance crank arm are driven away from the rotation path of the closing half-shaft assembly and no longer stop the rotation of the closing half-shaft assembly, allowing the circuit breaker to close smoothly.

[0006] In this utility model, a closing indicator shaft head fitting hole is provided on the crank arm connecting the closing indicator shaft. The closing indicator shaft head fitting hole is fitted onto the closing indicator shaft head extending to the right end of the partition plate. A connecting rod end hooking connection hole is also provided on the closing indicator shaft connecting crank arm. A connecting rod end hooking connection hole is provided on the closing half shaft assembly stop and avoidance crank arm. One end of the crank arm connecting rod is hooked to the connecting rod end hooking connection hole, and the other end is hooked to the connecting rod end hooking connection hole.

[0007] In this invention, a crank arm limiting disc fixing screw hole is provided on the end face of the crank head of the opening and closing indicator shaft, which extends to the right side of the partition plate, and at the center of the end face. A crank arm limiting disc is provided on the right side of the crank arm connecting the opening and closing indicator shaft to prevent the crank arm connecting the opening and closing indicator shaft from escaping from the crank head of the opening and closing indicator shaft. The crank arm limiting disc is fixed to the crank head of the opening and closing indicator shaft by a crank arm limiting disc fixing screw at a position corresponding to the crank arm limiting disc fixing screw hole.

[0008] In this invention, a milled plane is formed on the head of the opening and closing indicator shaft. The longitudinal cross-sectional shape of the head of the opening and closing indicator shaft at the part corresponding to the milled plane is formed into a D-shape by the milled plane. The shape of the mating hole of the opening and closing indicator shaft is also D-shaped.

[0009] In this invention, a crank arm pivot support shaft hole is provided on the partition plate at a position corresponding to the stop and avoidance crank arm of the closing half shaft assembly. The stop and avoidance crank arm of the closing half shaft assembly is rotatably supported on the right end of the crank arm pivot support shaft, while the left end of the crank arm pivot support shaft is fixed on the partition plate at a position corresponding to the crank arm pivot support shaft hole. A crank arm pivot support shaft head is formed at the right end of the crank arm pivot support shaft. The crank arm pivot support shaft head extends through the crank arm pivot support shaft head through hole provided on the stop and avoidance crank arm of the closing half shaft assembly to the right side of the stop and avoidance crank arm and is limited by a limiting nut after adding a disc spring.

[0010] In this invention, a Z-shaped bend is formed at one end of the crank arm connecting rod facing the crank arm connecting the opening and closing indicator shaft. The end of the Z-shaped bend is hooked and connected to the hook connection hole of the connecting rod end. An L-shaped bend is formed at one end of the crank arm connecting rod facing the stop and avoidance crank arm of the closing half shaft assembly. The L-shaped bend is hooked and connected to the hook connection hole of the connecting rod end on the stop and avoidance crank arm of the closing half shaft assembly.

[0011] In this utility model, the closing half-shaft assembly includes a closing trip half-shaft, a push plate, and a reset component. The closing trip half-shaft is mounted on the frame, the push plate is fixedly mounted on the closing trip half-shaft, and the reset component is sleeved on the closing trip half-shaft. The position of the reset component on the closing trip half-shaft is located on the side of the push plate facing the closing device. The reset component acts on the push plate and drives the closing trip half-shaft to reset together.

[0012] In this invention, the reset component is a torsion spring, with one torsion spring foot abutting against the push plate and the other torsion spring foot abutting against the closing device.

[0013] In this invention, the push plate is fixed to the closing trip half shaft by push plate fixing screws.

[0014] In this utility model, the closing device includes a push rod seat, a push rod, a return spring, and a closing electromagnet. The closing electromagnet is mounted on the frame and, in use, is connected to the control system via a circuit to receive an electric closing signal. One end of the push rod is connected to the moving iron core or trigger plate of the closing electromagnet, while the other end is slidably supported on the push rod seat and protrudes from the push rod seat cavity, corresponding to the push plate of the closing half-shaft assembly. The push rod has a stepped shaft structure with a push rod shoulder. One end of the return spring abuts against the push rod shoulder, while the other end abuts against the cavity wall of the push rod seat cavity of the push rod seat.

[0015] The advantages of the technical solution provided by this utility model are as follows: Since the structure of the interlocking device adopts the crank arm connecting rod, the opening and closing indicator shaft connecting crank arm and the closing half shaft assembly stop and avoid crank arm, it abandons the traditional installation mode of opening a sliding groove in the prior art. This can avoid reducing the strength of related parts, and can also reflect the due convenience in the installation process, thereby improving assembly efficiency and ensuring assembly quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 The diagram shows a detailed structural diagram of the crank arm connecting rod, the crank arm connecting the opening and closing indicator shaft, and the stop and avoidance crank arm of the closing half shaft assembly.

[0018] Figure 3 for Figure 1 and Figure 2 The diagram shows the stop and clearance crank arm of the closing half-shaft assembly being located on the rotation path of the closing half-shaft assembly, thus preventing the circuit breaker's closing device from performing secondary closing.

[0019] Figure 4 for Figure 1 and Figure 2 The diagram shows the circuit breaker being in the open position by the stop and clearance crank arm of the closing half-shaft assembly being positioned away from the rotation path of the closing half-shaft assembly. Detailed Implementation

[0020] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0021] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are in the form of... Figure 2 The position shown is a baseline and therefore should not be construed as a specific limitation on the technical solution provided by this utility model.

[0022] Please see Figures 1 to 2The diagram shows a frame 1 of a circuit breaker structure, which has several partitions 11 for dividing the interior of the circuit breaker housing into several independent areas. An operating mechanism and a closing device 2 are arranged within the frame 1. A closing / opening indicator shaft 3 is rotatably mounted on the aforementioned partitions 11. The aforementioned operating mechanism includes a closing half-shaft assembly 31 rotatably mounted on the aforementioned partitions 11. The diagram also shows a crank arm connecting rod 4, a closing / opening indicator shaft connecting crank arm 5, and a closing half-shaft assembly stop and avoidance crank arm 6. One end of the crank arm connecting rod 4 is connected to the closing / opening indicator shaft connecting crank arm 5, and the other end is connected to the closing half-shaft assembly stop and avoidance crank arm 6. The closing / opening indicator shaft connecting crank arm 5 is sleeved on the end of the aforementioned closing / opening indicator shaft 3 that extends to the right side of the aforementioned partitions 11. The closing half-shaft assembly stop and avoidance crank arm 6 is rotatably mounted on the aforementioned partitions 11.

[0023] When the circuit breaker is in the closed state, the stop and avoidance crank arm 6 of the closing half-shaft assembly is on the rotation path of the closing half-shaft assembly 31, so that the closing half-shaft assembly 31 cannot rotate, and the circuit breaker cannot be closed again by the closing device 2. When the circuit breaker is in the open state, the operation mechanism drives the opening and closing indicator shaft 3 to rotate, and then drives the opening and closing indicator shaft connecting crank arm 5 to rotate synchronously. Thus, the crank arm connecting rod 4 drives the stop and avoidance crank arm 6 of the closing half-shaft assembly. The stop and avoidance crank arm 6 of the closing half-shaft assembly leaves the rotation path of the closing half-shaft assembly 31 and no longer stops the rotation of the closing half-shaft assembly 31. The circuit breaker can be closed smoothly. The first connecting rod 4 is set on the opening and closing indicator shaft 3 through the first mounting hole 41.

[0024] Please see Figure 2 A closing indicator shaft head mating hole 51 is provided on the aforementioned closing indicator shaft connecting crank arm 5. The closing indicator shaft head mating hole 51 is fitted onto the closing indicator shaft head 32 of the aforementioned closing indicator shaft 3 extending to the right end of the aforementioned partition plate 11. A connecting rod end hooking connection hole 52 is also provided on the closing indicator shaft connecting crank arm 5. A connecting rod end hooking connection hole 61 is provided on the aforementioned closing half shaft assembly stop and avoidance crank arm 6. One end of the aforementioned crank arm connecting connecting rod 4 is hooked and connected to the aforementioned connecting rod end hooking connection hole 52, and the other end is hooked and connected to the aforementioned connecting rod end hooking connection hole 61 (i.e. hooking connection).

[0025] On the end face of the aforementioned opening and closing indicator shaft 32, which extends to the right side of the aforementioned partition plate 11, a crank arm limiting disc fixing screw hole 321 is provided at the center of the end face. On the right side of the aforementioned opening and closing indicator shaft connecting crank arm 5, a crank arm limiting disc 53 is provided to prevent the opening and closing indicator shaft connecting crank arm 5 from escaping from the aforementioned opening and closing indicator shaft head 32. The crank arm limiting disc 53 is fixed to the aforementioned opening and closing indicator shaft head 32 by a crank arm limiting disc fixing screw 531 at a position corresponding to the aforementioned crank arm limiting disc fixing screw hole 321.

[0026] A milled plane 322 is formed on the aforementioned opening and closing indicator shaft head 32. The longitudinal cross-sectional shape of the opening and closing indicator shaft head 32 at the part corresponding to the milled plane 322 is formed into a D-shape by the milled plane 322. The shape of the aforementioned opening and closing indicator shaft head mating hole 51 is D-shaped.

[0027] See you later Figure 2 A crank arm pivot support shaft hole 111 is provided on the aforementioned partition plate 11 at a position corresponding to the aforementioned closing half shaft assembly stop and avoidance crank arm 6. The aforementioned closing half shaft assembly stop and avoidance crank arm 6 is rotatably supported on the right end of the crank arm pivot support shaft 62, while the left end of the crank arm pivot support shaft 62 is fixed on the aforementioned partition plate 11 at a position corresponding to the crank arm pivot support shaft hole 111. A crank arm pivot support shaft head 621 is formed at the right end of the aforementioned crank arm pivot support shaft 62. The crank arm pivot support shaft head 621 extends through the crank arm pivot support shaft head through hole 63 provided on the closing half shaft assembly stop and avoidance crank arm 6 to the right side of the closing half shaft assembly stop and avoidance crank arm 6 and is limited by a limiting nut 6212 after adding a disc spring 6211.

[0028] Depend on Figure 2 As shown, a Z-shaped bend 41 is formed at one end of the aforementioned crank arm connecting rod 4 facing the aforementioned opening / closing indicator shaft connecting crank arm 5. The end of the Z-shaped bend 41 is hooked and connected to the hook connection hole 52 of the aforementioned connecting rod end. An L-shaped bend 42 is formed at one end of the crank arm connecting rod 4 facing the aforementioned closing half shaft assembly stop and avoidance crank arm 6. The L-shaped bend 42 is hooked and engaged with the connecting rod end on the closing half shaft assembly stop and avoidance crank arm 6 through the hook connection hole 61, and is limited by a cotter pin 421.

[0029] Please see Figure 3 and Figure 4The aforementioned closing half-shaft assembly 31 includes a closing trip half-shaft 311, a push plate 312, and a reset member 313. The closing trip half-shaft 311 is mounted on the aforementioned frame 1. The push plate 312 is fixedly mounted on the closing trip half-shaft 311. The reset member 313 is sleeved on the closing trip half-shaft 311. The position of the reset member 313 on the closing trip half-shaft 311 is located on the side of the push plate 312 facing the aforementioned closing device 2. The reset member 313 acts on the push plate 312 and drives the closing trip half-shaft 311 to reset together.

[0030] In this embodiment, the aforementioned reset member 313 is a torsion spring. One torsion spring leg abuts against the aforementioned push plate 312, while the other torsion spring leg abuts against the aforementioned closing device 2. The aforementioned push plate 312 is secured by push plate fixing screw 3121. Figure 4 (The marking) is fixed on the aforementioned closing trip half-shaft 311.

[0031] See you later Figure 3 and Figure 4 The aforementioned closing device 2 includes a push rod seat 21, a push rod 22, a return spring 23, and a closing electromagnet 24. The closing electromagnet 24 is mounted on the aforementioned frame 1 and, in use, is connected to the control system via a circuit to receive an electric closing signal. One end of the push rod 22 is connected to the moving iron core or trigger plate of the closing electromagnet 24, while the other end is slidably supported on the push rod seat 21 and protrudes from the push rod seat cavity of the push rod seat 21, corresponding to the push plate 312 of the aforementioned closing half-shaft assembly 31. The push rod 22 has a stepped shaft structure with a push rod shoulder. One end of the return spring 23 abuts against the aforementioned push rod shoulder, while the other end abuts against the cavity wall of the push rod seat cavity of the aforementioned push rod seat 21. In this way, after the circuit breaker completes the closing action, it can return to its original state under the action of the return spring 23.

[0032] Depend on Figure 3 As shown, when the circuit breaker is in the closed state, the stop and the avoidance crank arm 6 of the closing half shaft assembly are on the rotation path of the closing half shaft assembly 31. At this time, the closing half shaft assembly 31 cannot rotate, and the circuit breaker cannot be closed again by the closing device 2.

[0033] Depend on Figure 4 As shown, when the circuit breaker is tripped, the operating mechanism drives the tripping and closing indicator shaft 3 to rotate, which in turn drives the tripping and closing indicator shaft connecting crank arm 5 to rotate synchronously. This, in turn, drives the closing half-shaft assembly stop and avoidance crank arm 6 to rotate through the crank arm connecting rod 4. At this time, the closing half-shaft assembly stop and avoidance crank arm 6 leaves the rotation path of the closing half-shaft assembly 31 and no longer stops the rotation of the closing half-shaft assembly 31, so the circuit breaker can be closed smoothly.

[0034] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. An interlocking device for a circuit breaker, the circuit breaker comprising a frame (1) having a plurality of partitions (11) for dividing the interior of the circuit breaker housing into several independent regions, and an operating mechanism disposed within the frame (1), wherein a closing / opening indicator shaft (3) is rotatably disposed on the partitions (11), the operating mechanism comprising a closing half-shaft assembly (31) rotatably disposed on the partitions (11); characterized in that: The interlocking device includes a crank arm connecting rod (4), a crank arm connecting the opening and closing indicator shaft (5), and a stop and avoidance crank arm (6) for the closing half-shaft assembly. One end of the crank arm connecting rod (4) is connected to the crank arm connecting the opening and closing indicator shaft (5), and the other end is connected to the stop and avoidance crank arm (6) for the closing half-shaft assembly. The crank arm connecting the opening and closing indicator shaft (5) is sleeved on the end of the opening and closing indicator shaft (3). The stop and avoidance crank arm (6) for the closing half-shaft assembly is rotatably mounted on the partition plate (11). When the circuit breaker is in the closed state, the stop and avoidance crank arm (6) for the closing half-shaft assembly... When the avoidance crank arm (6) is on the rotation path of the closing half-shaft assembly (31), the closing half-shaft assembly (31) cannot rotate, and the circuit breaker cannot be closed. When the circuit breaker is in the open state, the operation mechanism drives the opening and closing indicator shaft (3) to rotate and then drives the opening and closing indicator shaft connecting crank arm (5) to rotate synchronously. Thus, through the crank arm connecting rod (4), the closing half-shaft assembly stops and the avoidance crank arm (6) leaves the rotation path of the closing half-shaft assembly (31) and no longer stops the rotation of the closing half-shaft assembly (31), so the circuit breaker can be closed smoothly.

2. The interlocking device for a circuit breaker according to claim 1, characterized in that: A closing indicator shaft head fitting hole (51) is provided on the closing indicator shaft connecting crank arm (5). The closing indicator shaft head fitting hole (51) is sleeved on the closing indicator shaft head (32) of the closing indicator shaft (3) extending to the right end of the partition (11). A connecting rod end hooking connection hole (52) is also provided on the closing indicator shaft connecting crank arm (5). A connecting rod end hooking connection hole (61) is provided on the closing half shaft assembly stop and avoidance crank arm (6). One end of the crank arm connecting rod (4) is hooked to the connecting rod end hooking connection hole (52), and the other end is hooked to the connecting rod end hooking connection hole (61).

3. The interlocking device for a circuit breaker according to claim 2, characterized in that: On the end face of the opening and closing indicator shaft (32) extending to the right side of the partition plate (11), a crank arm limiting disc fixing screw hole (321) is provided at the center of the end face. A crank arm limiting disc (53) is provided on the right side of the opening and closing indicator shaft connecting crank arm (5) to prevent the opening and closing indicator shaft connecting crank arm (5) from escaping from the opening and closing indicator shaft head (32). The crank arm limiting disc (53) is fixed to the opening and closing indicator shaft head (32) by the crank arm limiting disc fixing screw (531) at the position corresponding to the crank arm limiting disc fixing screw hole (321).

4. The interlocking device for a circuit breaker according to claim 3, characterized in that: A milled plane (322) is formed on the opening and closing indicator shaft head (32). The longitudinal cross-sectional shape of the opening and closing indicator shaft head (32) at the part corresponding to the milled plane (322) is formed into a D shape. The shape of the opening and closing indicator shaft head mating hole (51) is D-shaped.

5. The interlocking device for a circuit breaker according to claim 1, characterized in that: A crank arm pivot support shaft hole (111) is provided on the partition plate (11) at the position corresponding to the stop and avoidance crank arm (6) of the closing half shaft assembly. The stop and avoidance crank arm (6) of the closing half shaft assembly is rotatably supported on the right end of the crank arm pivot support shaft (62). The left end of the crank arm pivot support shaft (62) is fixed on the partition plate (11) at the position corresponding to the crank arm pivot support shaft hole (111). A crank arm pivot support shaft head (621) is formed at the right end of the crank arm pivot support shaft (62). The crank arm pivot support shaft head (621) extends through the crank arm pivot support shaft head through hole (63) on the stop and avoidance crank arm (6) of the closing half shaft assembly to the right side of the stop and avoidance crank arm (6) and is limited by a limiting nut (6212) after adding a disc spring (6211).

6. The interlocking device for a circuit breaker according to claim 2, characterized in that: A Z-shaped bend (41) is formed at one end of the crank arm connecting link (4) facing the opening and closing indicator shaft connecting crank arm (5). The end of the Z-shaped bend (41) is hooked and connected to the end of the connecting rod through the hook connection hole (52). An L-shaped bend (42) is formed at one end of the crank arm connecting link (4) facing the closing half shaft assembly stop and avoidance crank arm (6). The L-shaped bend (42) is hooked and connected to the end of the connecting rod on the closing half shaft assembly stop and avoidance crank arm (6) through the hook connection hole (61).

7. The interlocking device for a circuit breaker according to claim 1, characterized in that: The closing half-shaft assembly (31) includes a closing trip half-shaft (311), a push plate (312), and a reset member (313). The closing trip half-shaft (311) is mounted on the frame (1), the push plate (312) is fixedly mounted on the closing trip half-shaft (311), and the reset member (313) is sleeved on the closing trip half-shaft (311). The position of the reset member (313) on the closing trip half-shaft (311) is on the side of the push plate (312) facing the closing device (2). The reset member (313) acts on the push plate (312) and drives the closing trip half-shaft (311) to reset together.

8. The interlocking device for a circuit breaker according to claim 7, characterized in that: The reset component (313) is a torsion spring, with one torsion spring foot abutting against the push plate (312) and the other torsion spring foot abutting against the closing device (2).

9. The interlocking device for a circuit breaker according to claim 7, characterized in that: The push plate (312) is fixed on the closing trip half shaft (311) by push plate fixing screws (3121).

10. The interlocking device for a circuit breaker according to claim 9, characterized in that: The closing device (2) includes a push rod seat (21), a push rod (22), a return spring (23), and a closing electromagnet (24). The closing electromagnet (24) is mounted on the frame (1) and is connected to the control system via a line to receive an electric closing signal in use. One end of the push rod (22) is connected to the moving iron core or trigger plate of the closing electromagnet (24), while the other end is slidably supported on the push rod seat (21) and protrudes from the push rod seat cavity of the push rod seat (21) to correspond to the push plate (312) of the closing half shaft assembly (31). The push rod (22) has a stepped shaft structure with a push rod shoulder. One end of the return spring (23) abuts against the push rod shoulder, while the other end abuts against the cavity wall of the push rod seat cavity of the push rod seat (21).

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