Actuating mechanism and manufacturing method thereof

Abstract

The invention relates to the field of pneumatics, in particular to an actuating mechanism with higher stability and a manufacturing method, an exhaust cavity is used for communicating an exhaust port with the external space of a cylinder body, namely, gas exhausted through the exhaust port enters the exhaust cavity, and compared with the background technology, objects outside the actuating mechanism are prevented from directly entering the exhaust port to block the exhaust port, so that the service life of the actuating mechanism is prolonged. The stability of the executing mechanism is improved; the cylinder body profile is prepared and comprises blank drawing, namely the process of preparing the cylinder body comprises a drawing process, the first hole and the second hole used for forming the piston cavity and the exhaust cavity can be formed at a time, and compared with other machining modes, the efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the field of pneumatics, and in particular to an actuator and a method for manufacturing the actuator. Background Art

[0002] See also Figure 8 , an actuator includes a cylinder and a monolithic valve, the cylinder includes a piston assembly 001' and a piston chamber 002', at least part of the piston assembly 001' is located in the piston chamber 002', the monolithic valve 007' has a working port 004' and an air outlet 005', the working port 004' and the piston chamber 002' are connected, the working port 004' and the air outlet 005' are respectively connected to the valve chamber 008' of the monolithic valve 007', the monolithic valve 007' has a valve stem 003' located in the valve chamber 008', and the valve stem 003' is used to switch the air path and control the movement of the piston assembly; in this technology, the air outlet 005' may be blocked, affecting the stability of the actuator. Summary of the Invention

[0003] The present invention provides an actuator and a manufacturing method for solving the above-mentioned operation stability problem: It includes a control valve and a cylinder, which are limited or fixed. The control valve has a working port and an exhaust port. The cylinder includes a cylinder body, which has a piston chamber and an exhaust chamber. The working port and the piston chamber are connected, and the exhaust chamber is connected to the exhaust port and the external space of the cylinder body.

[0004] Such an actuator connects the exhaust port and the external space of the cylinder body through the exhaust chamber, that is, the gas discharged through the exhaust port enters the exhaust chamber. Compared with the background technology, it prevents external objects of the actuator from directly entering the exhaust port and causing blockage of the exhaust port, thereby improving the stability of the actuator.

[0005] A method for manufacturing an actuator, characterized by comprising: Provide rough materials; Preparing a cylinder block profile, including drawing a blank, wherein the cylinder block profile has a first hole and a second hole, and a wall of the first hole and a wall of the second hole extend along a drawing direction; preparing a cylinder block, including machining a cylinder block profile, wherein the cylinder block has an exhaust cavity; Provide a control valve, a front cover, a rear cover and a piston assembly, assemble the control valve, the front cover, the rear cover, the piston assembly and the cylinder body, and connect the exhaust port and the exhaust cavity of the control valve.

[0006] Such a manufacturing method of an actuator controls the exhaust port of the valve and the exhaust chamber to be connected, that is, the gas discharged through the exhaust port enters the exhaust chamber. Compared with the background technology, this method avoids external objects of the actuator from directly entering the exhaust port and causing blockage of the exhaust port, thereby improving the stability of the actuator; preparing the cylinder body profile, including drawing the blank, that is, the process of preparing the cylinder body includes a drawing process, which can form the first hole and the second hole for forming the piston chamber and the exhaust chamber at one time, which is more efficient than other processing methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic front view of an actuator according to an embodiment; Figure 2 for Figure 1 Schematic side view of the actuator; Figure 3 for Figure 1 Exploded diagram of the actuator; Figure 4 for Figure 1 Schematic cross-section of the UU position of the middle actuator; Figure 5 for Figure 1 Schematic cross-section of the actuator WW position; Figure 6 for Figure 2 Schematic cross-section of the actuator QQ position; Figure 7 A schematic diagram of a manufacturing method of an actuator; Figure 8 A cross-sectional schematic diagram of an execution device of background technology.

[0008] Reference numerals: Control valve 1, working port 11, first working port 11a, second working port 11b, exhaust port 12, first exhaust port 12a, second exhaust port 12b, air inlet 13, valve body 14, valve stem 15, valve chamber 16; Cylinder 2, piston chamber 21, cylinder body 22, exhaust chamber 221, first exhaust chamber 221a, second exhaust chamber 221b, first port 2211, second port 2212, first portion 2213, first end portion 222, second end portion 223, conducting channel 224, second channel 2241, extended hole section 2242, first communicating section 2243, second communicating section 2244, connecting section 2245, platform portion 225, platform wall 2251, first side wall portion 2252, outer wall 22521 of the first side wall portion, inner wall 22522 of the first side wall portion, second side wall portion 2253, outer wall 22531 of the second side wall portion, inner wall 22532 of the second side wall portion, first step portion 226, second step portion 227, communicating channel 228, first channel 2281, third channel 2282, piston assembly 24, front cover 25, rear cover 26; Blank 0022'; cylinder profile 0022, first hole 021', second hole 0221; cylinder blank 022, first hole section 021.

[0009] Piston assembly 001'; piston chamber 002'; monolithic valve 007'; valve chamber 008'; rod body 003'; working port 004'; air outlet 005'; transition plate 006'; conducting channel 009' DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0011] The technical solutions of the specific implementation methods are described below with reference to the accompanying drawings: In the present invention, see Figures 1 to 6 , an actuator, including a cylinder 2 and a control valve 1, the cylinder 2 includes a cylinder body 22, a piston assembly 24, the cylinder 2 also includes a piston chamber 21, at least part of the piston assembly 24 is located in the piston chamber 21, and the piston assembly 24 can slide with the inner wall of the piston chamber 21; the control valve 1 includes a working port 11, an exhaust port 12 and an air inlet 13, the working port 11 is connected to the piston chamber 21, the exhaust port 12 is connected to the outside of the control valve 1, the control valve 1 includes a valve body 14 and a valve stem 15, the working port 11 and the exhaust port 12 are respectively located in the valve body 14, the control valve 1 includes a valve chamber 16, the valve stem 15 moves in the valve chamber 16, the gas enters the valve chamber 16 through the air inlet 13, enters the piston chamber 21 through the working port 11, enters the valve chamber 16 from the piston chamber 21 through the working port 11, and is discharged from the valve chamber 16 through the exhaust port 12. The control valve 1 is controlled by the movement of the piston rod to control the switching of the air circuit and realize the movement of the piston assembly 24. The following takes the two-position five-way valve and the cylinder 2 as an example to introduce the working principle in detail.

[0012] The control valve 1 includes two working ports 11 and two exhaust ports 12, namely a first working port 11a and a second working port 11b, a first exhaust port 12a and a second exhaust port 12b. The first working port 11a is connected to the valve chamber 16 and the piston chamber 21, and the second working port 11b is connected to the valve chamber 16 and the piston chamber 21. When the valve stem 15 is in the first position, the air inlet 13 is connected to the first working port 11a, the air inlet 13 and the second working port 11b are disconnected, the first working port 11a and the first exhaust port 12a are disconnected, and the second working port 11b and the second exhaust port 12b are connected. The gas enters the piston chamber 21 through the first working port 11a, acts on one side of the piston assembly 24, and the piston assembly 24 is opened. When the piston assembly 24 moves in the positive direction of the first direction, the gas on the other side of the piston chamber 21 is discharged from the cylinder 2 through the second working port 11b and the second exhaust port 12b; when the valve stem 15 is in the second position, the air inlet 13 and the second working port 11b are connected, the air inlet 13 and the first working port 11a are disconnected, the first working port 11a and the first exhaust port 12a are connected, the second working port 11b and the second exhaust port 12b are disconnected, and the gas enters the piston chamber 21 through the second working port 11b, acts on one side of the piston assembly 24, and the piston assembly 24 moves in the opposite direction of the first direction, and the gas on the other side of the piston chamber 21 is exhausted from the cylinder 2 through the first working port 11a and the first exhaust port 12a.

[0013] In one prior art, reference is made to Figure 8 The gas is directly discharged to the outside of the actuator through the gas outlet 005'. When the gas outlet 005' suddenly stops exhausting, the pressure near the gas outlet 005' suddenly decreases, and the external pressure is higher, resulting in a pressure difference, causing gas backflow, which easily inhales particles and dust outside the actuator, causing the gas outlet 005' to be blocked, affecting the stability of the actuator.

[0014] In the present invention, see Figures 1 to 6 The cylinder 2 includes a cylinder body 22 having an exhaust chamber 221 , and the exhaust chamber 221 is connected to the exhaust port 12 .

[0015] Such an actuator is connected through the exhaust chamber 221 and the exhaust port 12, that is, the gas discharged through the exhaust port 12 enters the exhaust chamber 221. Compared with the background technology, it prevents external objects of the actuator from directly entering the exhaust port 12 and causing blockage of the exhaust port 12, thereby improving the stability of the actuator.

[0016] Specifically, the exhaust cavity 221 is connected to the outside of the actuator, and the gas entering the exhaust cavity 221 through the exhaust port 12 is then discharged to the outside of the actuator through the exhaust cavity 221.

[0017] In one embodiment, the cylinder 2 includes a connecting channel 228, which connects the exhaust port 12 and the exhaust chamber 221. Specifically, the cylinder body 22 has a platform wall 2251, the control valve 1 is arranged on the platform wall 2251, and the control valve 1 and the cylinder body 22 are limited or fixed. One port of the connecting channel 228 is located on the platform wall 2251, and the other port of the connecting channel 228 is located on the cavity wall of the exhaust chamber 221. More specifically, there is a seal (not shown in the figure) between the platform wall 2251 and the control valve 1. The seal can be a sealing ring. The gas discharged from the exhaust port 12 enters the connecting channel 228 through the port of the connecting channel 228, and enters the exhaust chamber 221 through the connecting channel 228, thereby preventing the gas from leaking out at the exhaust port 12.

[0018] Along the first direction, the walls of the exhaust chamber 221 extend along the first direction. The exhaust chamber 221 has a first port 2211 and a second port 2212, respectively located at the first end 222 and the second end 223 of the cylinder body 22 along the first direction. More specifically, the exhaust chamber 221 is a through hole located along the first direction in the valve body 14. The walls of the exhaust chamber 221 can be formed by drawing. More specifically, at least a portion of the walls of the piston chamber 21 extend along the first direction, meaning that the exhaust chamber 221 and the portion forming the piston chamber 21 can be simultaneously formed by drawing. In some prior art techniques, the cylinder body 22 is formed by die casting. To achieve satisfactory surface accuracy, further machining is required after die casting, which is a relatively complex process. In this embodiment, the machining process and steps are much simpler.

[0019] It should be noted that: "the portion that simultaneously forms the exhaust chamber 221 and the piston chamber 21" can be understood as, in this embodiment, after drawing, the hole wall of the drawn hole can be machined, for example, the aperture of the hole is enlarged at the ends along the first direction, and a first step portion 226 and a second step portion 227 are formed on the inner wall of the hole, which can be used to limit the front cover 25 and the rear cover 26 of the cylinder 2 respectively, and the piston chamber 21 can be formed on the portion of the wall corresponding to the hole that is not machined again.

[0020] Specifically, the cylinder body 22 has a platform portion 225. In the arrangement direction of the cylinder 2 and the control valve 1, the control valve 1 is located at the top of the cylinder 2. The platform wall 2251 is the top wall of the platform portion 225. The cylinder body 22 has a first side wall portion 2252 and a second side wall portion 2253. Specifically, the platform portion 225 has a first side wall portion 2252 and a second side wall portion 2253. An outer wall 22521 of the first side wall portion and an outer wall 22531 of the second side wall portion extend from the platform wall 2251 in the arrangement direction of the control portion and the cylinder 2. Specifically, the outer wall 22521 of the first side wall portion and the outer wall 22531 of the second side wall portion extend from the platform wall 2251 in a direction away from the control valve 1. The outer walls 22521 and 22531 of the first side wall portion are respectively located on either side of the platform wall 2251. More specifically, the outer wall 22521 of the first side wall portion and the outer wall 22531 of the second side wall portion respectively have a first fixed position (not shown in the figure) and a second fixed position (not shown in the figure). In this way, in the process of manufacturing the actuator, the cylinder body 22 is limited. The first fixed position can be a first clamping position (not shown in the figure), and the second fixed position can be a second clamping position (not shown in the figure). That is, in the process of manufacturing the actuator, the cylinder body 22 can be supported by a supporting mechanism (not shown in the figure) to achieve the limitation of the cylinder body 22.

[0021] The inner wall 22522 of the first side wall portion or the inner wall 22532 of the second side wall portion extends along the arrangement direction of the control valve 1 and the cylinder 2. Specifically, the inner wall 22522 of the first side wall portion and / or the inner wall 22532 of the second side wall portion extends in a direction away from the control valve 1, that is, the inner wall 22522 of the first side wall portion and the outer wall 22521 of the first side wall portion extend in the direction away from the control valve 1. More specifically, the inner wall 22522 of the first side wall portion and the outer wall 22521 of the first side wall portion extend in a direction away from the control valve 1; the inner wall 22532 of the second side wall portion and the outer wall 22531 of the second side wall portion extend in the same direction. More specifically, the outer wall 22531 of the second side wall portion and the inner wall 22532 of the second side wall portion extend in a direction away from the control valve 1. The inner wall 22522 of the first side wall portion and / or the inner wall 22532 of the second side wall portion are part of the cavity wall of the exhaust chamber 221. The inner wall 22522 of the first side wall portion and the outer wall 22521 of the first side wall portion extend in the same direction and / or the inner wall 22532 of the second side wall portion and the outer wall 22531 of the second side wall portion extend in the same direction, which can increase the space occupied by the exhaust chamber 221 in the cylinder body 22. Under the same volume, the space of the exhaust chamber 221 is larger, which is convenient for exhaust.

[0022] In this embodiment, the number of exhaust cavities 221 can be two, namely a first exhaust cavity 221a and a second exhaust cavity 221b. The inner wall 22522 of the first sidewall portion is part of the cavity wall of the first exhaust cavity 221a, and the inner wall 22532 of the second sidewall portion is part of the cavity wall of the second exhaust cavity 221b. More specifically, the connecting channel 228 includes two first channels 2281 and two third channels 2282. Of the two first channels 2281, one first channel 2281 connects the first exhaust port 12a to the first exhaust cavity 221a, and the other first channel 2281 connects the first exhaust port 12a to the second exhaust cavity 221b. Of the two third channels 2282, one third channel 2282 connects the second exhaust port 12b to the first exhaust cavity 221a, and the other third channel 2282 connects the second exhaust port 12b to the second exhaust cavity 221b. The gas exhausted through the first exhaust port 12a enters the first exhaust chamber 221a and the second exhaust chamber 221b through the two first channels 2281 respectively, and is discharged to the outside of the actuator respectively, thereby improving the exhaust efficiency; the gas exhausted through the second exhaust port 12b is discharged to the outside of the actuator respectively through the two third channels 2282 respectively, thereby improving the exhaust efficiency.

[0023] The cylinder body 22 has a conducting channel 224, which includes a second channel 2241. The second channel 2241 connects the piston chamber 21 and the working port 11. The second channel 2241 includes a first connecting section 2243, a second connecting section 2244 and a connecting section 2245. The connecting section 2245 connects the first connecting section 2243 and the second connecting section 2244. The connecting section 2245 extends along the first direction. The cylinder body includes an extension hole section 2242. The extension hole section 2242 and the connecting section 2245 extend and connect. The exhaust chamber 2 The inner wall of 21 includes a first part 2213, and there is a wall thickness between the cavity wall of the connecting section 2245 and the first part 2213, and the cavity wall of the connecting section 2245 and the first part 2213 are extended with the same wall thickness, and / or there is a wall thickness between the cavity wall of the extended hole section 2242 and the first part 2213, and the cavity wall of the extended hole section 2242 and the first part 2213 are extended with the same wall thickness. In this way, the space occupied by the exhaust chamber 221 in the cylinder body 22 can be increased. Under the same volume, the space of the exhaust chamber 221 is larger, which is convenient for exhaust.

[0024] Specifically, the second channel 2241 connects one of the first working port 11a and the second working port 11b with the piston chamber 21. More specifically, the first end 222 is located in the negative direction of the first direction of the second end 223, and the first working port 11a is located in the negative direction of the first direction of the second working port 11b. The cylinder body 22 has a connecting channel 224, and the connecting channel 224 connects the first working port 11a and the piston chamber 21, and the second working port 11b and the piston chamber 21 respectively. More specifically, the inner wall of the first exhaust chamber 221a includes a first portion 2213 , and the inner wall of the second exhaust chamber 221b includes a first portion 2213 . The first communicating section 2243 , the second communicating section 2244 , and the connecting section 2245 connect the second working port 11b and the piston chamber 21 .

[0025] A method for manufacturing an actuator, see Figures 1 to 7 , Figure 7 a is a schematic diagram of the blank, Figure 7 b is a schematic diagram of the main view of the cylinder profile formed after drawing; Figure 7 c is a side view schematic diagram of the cylinder profile formed after drawing; Figure 7 d is a schematic diagram of the main view of at least two cylinder blanks formed after cutting; Figure 7 e is a side view of a cylinder blank after cutting; Figure 7 f is a schematic diagram of the cylinder blank machining; Figure 7 g is a schematic diagram of the cylinder blank machining; Figure 7 h is a schematic diagram of the cylinder blank machining.

[0026] A method for manufacturing an actuator, characterized by comprising: Provide rough materials; Preparing a cylinder block profile, including drawing a blank, wherein the cylinder block profile has a first hole and a second hole, and a wall of the first hole and a wall of the second hole extend along a drawing direction; preparing a cylinder block, including machining a cylinder block profile, wherein the cylinder block has an exhaust cavity; Provide a control valve, a front cover, a rear cover and a piston assembly; assemble the control valve, the front cover, the rear cover, the piston assembly and the cylinder body, and connect the exhaust port and the exhaust cavity of the control valve.

[0027] Such a manufacturing method of an actuator controls the exhaust port of the valve and the exhaust chamber to be connected, that is, the gas discharged through the exhaust port enters the exhaust chamber. Compared with the background technology, this method avoids external objects of the actuator from directly entering the exhaust port and causing blockage of the exhaust port, thereby improving the stability of the actuator; preparing the cylinder body profile, including drawing the blank, that is, the process of preparing the cylinder body includes a drawing process, which can form the first hole and the second hole for forming the piston chamber and the exhaust chamber at one time, which is more efficient than other processing methods.

[0028] Specifically, the steps of machining the cylinder profile include: Cylinder profile 0022 is cut to obtain at least two cylinder blanks 022. Each cylinder blank 022 includes a first bore section 021 and an exhaust cavity 221. The first bore section 021 is used to form the piston cavity 21. The at least two cylinder blanks 022 can be the same or different in length. Depending on the specific situation, the corresponding lengths can be cut to achieve greater adaptability. Furthermore, by cutting cylinder profile 0022 to obtain at least two cylinder blanks 022, at least two cylinder blanks 022 can be obtained at once, which is more efficient.

[0029] See also Figure 7 f. The steps of preparing the cylinder body include: Along the drawing direction, both ends of the hole wall of the first hole 021 ′ are machined to expand the hole diameter at both ends to form a first step portion 226 and a second step portion 227 ; the machining method can be drilling or milling.

[0030] See also Figure 7 h. The steps of preparing the cylinder body include: In the cylinder blank 022 is machined to form a communicating channel 228, the communicating channel 228 and the exhaust chamber 221 are connected; See also Figure 7 g. The steps of preparing the cylinder body include: A conducting channel 224 is machined in the cylinder blank 022, and the conducting channel 224 is in communication with the hole of the first hole section 021. The machining method can be drilling, milling or other methods.

[0031] The control valve and the cylinder are assembled so that the working port 11 of the control valve 1 and the conducting channel 224 are in communication with each other.

Claims

1. An actuator, comprising a control valve (1) and a cylinder (2), characterized in that: The control valve (1) and the cylinder (2) are positionally connected or fixedly arranged, the control valve (1) having a working port (11) and an exhaust port (12), the cylinder (2) comprising a cylinder body (22), the cylinder body (22) having a piston chamber (21) and an exhaust chamber (221), the working port (11) and the piston chamber (21) being in communication, and the exhaust chamber (221) being in communication with the exhaust port (12) and the external space of the cylinder body (22).

2. The actuator according to claim 1, characterized in that: The cylinder body (22) comprises a communication channel (228), wherein the communication channel (228) connects the exhaust port (12) and the exhaust chamber (221); the cylinder body (22) has a platform wall (2251); the control valve (1) is arranged on the platform wall (2251); and the control valve (1) and the cylinder body (22) are position-limited or fixedly arranged; one port of the communication channel (228) is located on the platform wall (2251), and the other port of the communication channel (228) is located on the wall of the exhaust chamber (221).

3. The actuator according to claim 1 or 2, characterized in that: The cylinder (2) includes a piston assembly (24), and the moving direction of the piston assembly (24) is defined as a first direction; the cylinder body (22) is an integral structure, and the cylinder body (22) is prepared by a drawing process, and the cavity wall of the exhaust cavity (221) extends along the first direction, and the exhaust cavity (221) has a first port (2211), and the first port (2211) is located at a first end (222) of the cylinder body (22) along the first direction.

4. The actuator according to claim 1 or 2, characterized in that: The cylinder (2) includes a piston assembly (24), and the moving direction of the piston assembly (24) is defined as a first direction; the cavity wall of the exhaust chamber (221) extends along the first direction, the cylinder body (22) has a first end (222) and a second end (223) along the first direction, and the exhaust chamber (221) has a first port (2211) and a second port (2212) along the first direction, the first port (2211) is located at the first end (222), and the second port (2212) is located at the second end (223).

5. The actuator according to any one of claims 2 to 4, characterized in that: The platform wall (2251) extends along the first direction, the cylinder body (22) has a first side wall portion (2252) and a second side wall portion (2253), the outer wall (22521) of the first side wall portion and the outer wall (22531) of the second side wall portion extend from the platform wall (2251) along the arrangement direction of the control valve (1) and the cylinder (2), and the outer wall (22521) of the first side wall portion and the outer wall (22531) of the second side wall portion are respectively located on both sides of the platform wall (2251).

6. The actuator according to claim 5, characterized in that: The inner wall (22522) of the first side wall portion and / or the inner wall (22532) of the second side wall portion extend along the arrangement direction of the control valve (1) and the cylinder (2), and the inner wall (22522) of the first side wall portion and / or the inner wall (22532) of the second side wall portion are part of the cavity wall of the exhaust cavity (221).

7. The actuator according to claim 4 or 5, characterized in that: The cylinder body (22) has a second channel (2241), the second channel (2241) connects the piston chamber (21) and the working port (11), the second channel (2241) includes a first connecting section (2243), a second connecting section (2244) and a connecting section (2245), the connecting section (2245) connects the first connecting section (2243) and the second connecting section (2244), the connecting section (2245) extends along the first direction, the cylinder body includes an extension hole section (2242), the extension hole section (2242) and the connecting section (2245) are extended and connected, and the cavity wall of the exhaust cavity (221) includes a first part (2213); there is a wall thickness between the cavity wall of the connecting section (2245) and the first part (2213), and the cavity wall of the connecting section (2245) and the first part (2213) are extended with the same wall thickness, and / or there is a wall thickness between the cavity wall of the extended hole section (2242) and the first part (2213), and the cavity wall of the extended hole section (2242) and the first part (2213) are extended with the same wall thickness.

8. A method for manufacturing an actuator, characterized in that: include: Provide blank (0022'); Preparing a cylinder profile (0022), comprising drawing the blank (0022'), wherein the cylinder profile (0022) has a first hole (021') and a second hole (0221), and the wall of the first hole (021') and the wall of the second hole (0221) extend along a drawing direction; Preparing a cylinder body (22), comprising machining the cylinder body profile (0022), wherein the cylinder body (22) has an exhaust cavity (221); A control valve (1), a front cover (25), a rear cover (26) and a piston assembly (24) are provided. The control valve (1), the front cover (25), the rear cover (26), the piston assembly (24) and the cylinder body (22) are assembled, and the exhaust port (12) of the control valve (1) and the exhaust chamber (221) are connected.

9. The method for manufacturing an actuator according to claim 8, wherein: The step of preparing the cylinder body (22) comprises cutting the cylinder body profile (0022) to obtain at least two cylinder body blanks (022), each of the cylinder body blanks (022) comprising a first hole section (021) and an exhaust cavity (221).

10. The method for manufacturing an actuator according to claim 9, wherein: The steps of preparing the cylinder body (22) include: A communication channel (228) is machined on the cylinder blank (022), wherein the communication channel (228) is in communication with the exhaust chamber (221); A conducting channel (224) is machined on the cylinder blank (022), and the conducting channel (224) is connected to the hole of the first hole section (021).

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