Pneumatic cutting device

Abstract

The utility model discloses a kind of pneumatic cutting device, belong to cutting equipment technical field, including vibration valve seat and the piston assembly installed in vibration valve seat, the right end of the piston assembly is connected with tool bit assembly, the left end of the piston assembly is connected with air intake assembly, tailstock main body includes first shaft body, second shaft body, third shaft body and fourth shaft body from right to left sequentially coaxially arranged and integrally formed, buffer pad is installed between the vibration valve seat and piston assembly, the buffer pad includes first buffer pad and second buffer pad, the utility model constructs the anti-vibration silence system covering the whole process of air intake, work, exhaust, effectively reduces noise and vibration;Through tailstock coaxial structure design and jig guide optimization, improve cutting precision;Core components are optimized in structure and material, extend equipment service life, reduce potential safety hazard and improve the technical effect of work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of cutting equipment technology, and in particular relates to a pneumatic cutting device. Background Technology

[0002] Currently, pneumatic cutting heads, as the core tool for high-frequency vibration cutting, are widely used in fields such as clothing fabric cutting, automotive interior processing, and advertising material cutting. They use compressed air to drive a piston in reciprocating motion, which in turn drives the blade to achieve rapid cutting. However, existing technologies have some shortcomings in terms of vibration damping and noise reduction.

[0003] During operation, compressed air enters the cylinder rapidly at high pressure, and the impact noise generated during valve switching can reach 90-100 dB. At the same time, mechanical noise such as friction between the piston and the cylinder wall and collision of metal parts further exacerbates noise pollution. This high-intensity noise not only violates the OSHA (Occupational Safety and Health Administration) occupational exposure limit of 85 dB, but may also cause permanent hearing damage. In addition, noise interference can affect the operator's judgment of the cutting status and increase the risk of operational errors.

[0004] When the piston assembly reciprocates at high frequency, the vibration is rigidly transmitted through the shaft and housing, causing the cutter head to vibrate, resulting in deviations in cutting accuracy. Furthermore, the fatigue wear of components shortens their service life. At the same time, the vibration of the pneumatic cutter head may cause resonance in other components. When the vibration frequency of the cutter head is close to the natural frequency of the internal air valve, pipeline, or housing, a resonance amplification effect will occur, causing a sharp increase in the amplitude of the components. This resonance will not only accelerate the wear of the air valve seals and cause the pipeline to loosen and leak, but may also cause fatigue cracks in the housing, significantly shortening the service life of the equipment. In addition, the secondary vibration and noise generated by the resonance will further deteriorate the working environment and increase the health threat to operators. Moreover, the component damage caused by resonance may also trigger sudden equipment failures, increasing production safety hazards. Utility Model Content

[0005] To address the problems of existing technologies, this utility model provides a pneumatic cutting device that features a vibration-damping and noise-reducing system covering the entire process of air intake, operation, and exhaust, effectively reducing noise and vibration. Through a coaxial tailstock structure design and optimized clamping guidance, cutting accuracy is improved. Furthermore, structural and material optimization of core components extends equipment lifespan, reduces safety hazards, and increases work efficiency. This invention solves two main problems in existing technologies: first, insufficient vibration damping performance, where high-frequency piston vibration is transmitted through a rigid structure, causing blade vibration, affecting cutting accuracy, and easily triggering component resonance, accelerating equipment wear, shortening lifespan, and worsening the working environment; and second, poor noise reduction, with excessive noise generated by valve switching and mechanical friction, which may damage operator hearing, interfere with judgment of the cutting status, and increase the risk of operational errors.

[0006] This utility model is implemented as follows: a pneumatic cutting device includes a vibrating valve seat and a piston assembly installed within the vibrating valve seat. A cutter assembly is connected to the right end of the piston assembly, and an air intake assembly is connected to the left end of the piston assembly. The air intake assembly includes a tailstock body and an air nozzle connector. The tailstock body includes a first shaft, a second shaft, a third shaft, and a fourth shaft, coaxially arranged and integrally formed from right to left. The right end of the first shaft is connected to the piston assembly, and the left end of the fourth shaft communicates with the air nozzle connector. A plurality of elastic washers for shock absorption are installed on the first, second, third, and fourth shafts. The elastic washers include a first elastic washer, a second elastic washer, a third elastic washer, a fourth elastic washer, and a fifth elastic washer. The device includes an elastic washer, a fourth elastic washer, and a fifth elastic washer. A vent hole is provided on the tailstock body, extending axially through the first shaft, second shaft, third shaft, and fourth shaft. A tailstock muffler is fitted onto the fourth shaft. The right end of the tailstock muffler has a mounting groove for installing sound-absorbing cotton, and the mounting groove communicates with the vent hole. The left end of the piston assembly has a groove for installing an upper compression spring. The upper compression spring is fitted onto the first shaft, and its left end abuts against the right end face of the second shaft. A lower compression spring body is installed on the right end of the piston assembly, extending to the inner wall of the right end of the vibration valve seat. A buffer pad is installed between the vibration valve seat and the piston assembly, and the buffer pad includes a first buffer pad and a second buffer pad.

[0007] As a preferred embodiment of the present invention, the first shaft, the second shaft, the third shaft and the fourth shaft are arranged in a coaxial stepped structure, and the first shaft, the second shaft, the third shaft and the fourth shaft are arranged sequentially from left to right along the axial direction and fixedly connected as one unit.

[0008] In a preferred embodiment of this invention, a fifth elastic washer is fitted onto the second shaft, the fifth elastic washer being sandwiched between the second shaft and the inner wall of the vibration valve seat. A groove for installing a fourth elastic washer is provided on the inner wall of the tailstock muffler, the fourth elastic washer being interference-fitted onto the fourth shaft. A groove for installing a third elastic washer is provided on the right end face of the tailstock muffler, the right end face of the third elastic washer being in elastic contact with the left end face of the third shaft.

[0009] In a preferred embodiment of this utility model, the piston assembly includes a vibrating cylinder located within a vibrating valve seat. A piston cylinder is installed within the vibrating cylinder, and an extension rod extends axially from the right end of the piston cylinder. The extension rod of the piston cylinder passes through the right end face of the vibrating cylinder. A piston body is slidably connected axially within the piston cylinder. A piston rod is coaxially fixed to the right end of the piston body. The piston rod is slidably connected within the extension rod of the piston cylinder. The first buffer pad and the second buffer pad are both sleeved on the outer wall of the vibrating cylinder. A plurality of buffer pad grooves are formed on the inner wall of the vibrating valve seat, and the outer ring of the buffer pad extends into the buffer pad groove. The left end of the piston cylinder is connected to a valve core installed in the vibrating cylinder. The piston assembly also includes an intake rod installed in the vibrating cylinder and a cylinder positioning ring threaded to the left end of the vibrating cylinder. The left end of the intake rod passes through the cylinder positioning ring and extends into the through hole of the tailstock body. The left end of the intake rod communicates with the valve core.

[0010] As a preferred embodiment of this utility model, a lower pressure spring positioning ring is fixedly provided inside the vibration valve seat. The lower pressure spring positioning ring is coaxially sleeved on the outside of the extension rod of the piston cylinder. A first annular lower pressure spring groove is opened on the left end face of the lower pressure spring positioning ring. A second lower pressure spring groove coaxial with the first lower pressure spring groove is opened on the right end face of the vibration cylinder. The left end of the lower pressure spring is embedded in the first lower pressure spring groove and the right end is embedded in the second lower pressure spring groove. The outer diameter of the lower pressure spring is compatible with the inner diameter of the corresponding groove.

[0011] As a preferred embodiment of this utility model, the outer wall of the tailstock muffler is provided with a plurality of shock-absorbing rings spaced axially, and the outer wall of the tailstock muffler is provided with a plurality of exhaust holes communicating with the mounting groove of the sound-absorbing cotton in the radial direction.

[0012] As a preferred embodiment of this utility model, a plurality of copper sleeves are provided between the piston rod and the piston cylinder, and the copper sleeves are fixedly connected to the inner wall of the extension rod of the piston cylinder, and the piston rod is slidably connected inside the copper sleeves.

[0013] As a preferred embodiment of this utility model, a lower spring sleeve is fitted on the right end of the vibration valve seat, and a blade cover spring extending axially to the vibration valve seat is fixed on the outer wall of the lower spring sleeve. A lower protective cover is fixed inside the lower spring sleeve, and a through-hole for the cutter to pass through is provided on the lower protective cover. A groove for installing a first elastic washer is provided on the inner wall of the lower protective cover, and the inner wall of the first elastic washer contacts the outer wall of the vibration valve seat.

[0014] In a preferred embodiment of this invention, the cutter head assembly is fixedly connected to the right end of the piston rod. The cutter head assembly includes a clamping positioning ring fixedly connected to the vibration valve seat, a blade positioning clamp slidably connected within the clamping positioning ring, and a blade fixedly connected to the blade positioning clamp. The blade positioning clamp is fixedly connected to the right end of the piston rod. The blade positioning clamp has an axial blade groove and a piston rod groove. The blade positioning clamp has bolt holes extending radially to the blade groove and the piston rod groove. By tightening the bolts, the piston rod and the blade are pressed and fixed on the blade positioning clamp. The piston rod drives the blade positioning clamp to reciprocate axially within the clamping positioning ring.

[0015] As a preferred embodiment of the present invention, a second elastic washer is installed in the first shaft body. The second elastic washer serves a sealing function and is sleeved on the intake rod. A retaining spring for fixing the second elastic washer is also installed in the first shaft body.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model has vibration and noise reduction control throughout the entire process of air intake, operation and exhaust. Compressed gas enters the tailstock through hole from the air nozzle connector, and after being adjusted by the valve core, it pushes the piston to move. At this time, the tailstock muffler reduces the intake noise and vibration through the sound-absorbing cotton and elastic gasket. The spring and buffer pad of the piston assembly absorb the reciprocating impact. The elastic structure of the cutter head assembly ensures the cutting stability. The exhaust gas enters the noise reduction assembly through the vent hole and is decelerated through the multi-stage sound-absorbing chamber before being discharged. The multi-stage silencing structure reduces noise. The mounting slot of the tail muffler is inlaid with sound-absorbing cotton, which, together with the exhaust port and the vent, forms an airflow buffer channel. When the compressed gas passes through the sound-absorbing cotton, the energy is dissipated, the flow rate is reduced, and the noise is significantly reduced. Axial elastic compensation, radial damping compensation, and multiple elastic buffers reduce vibration. The upper and lower compression springs form axial elastic support, and the two springs work together to reduce piston return impact by 60%. The fourth elastic washer on the inner wall of the tailstock muffler compensates for high-frequency micro-vibrations when the tailstock is connected to the air nozzle connector. The third and fifth elastic washers form multi-layer elastic support to buffer the transmission of axial vibration. The buffer pad on the outer wall of the vibration cylinder is embedded in the buffer pad groove of the vibration valve seat to absorb radial vibration energy. When the radial vibration frequency is >500Hz, the damping ratio increases to 0.12, and the vibration amplitude is reduced by 40%. Structural optimization enhances cutting stability. The piston rod of the piston assembly is fixedly connected to the tool positioning fixture. With the guidance of the fixture positioning ring, the coaxiality of the blade's reciprocating motion is ensured, thus improving cutting accuracy. The airflow path design optimizes power transmission. The axial through hole of the tailstock connects to the valve core of the intake rod, forming a smooth intake channel. The compressed gas drives the piston cylinder to move, resulting in high power transmission efficiency. The vent holes are circumferentially distributed on the second and third shafts. Together with the sound-absorbing cotton mounting groove, the exhaust pressure is balanced, reducing airflow pulsation noise. The lightweight design uses titanium alloy material for core components with a high wear-resistant coating, which has the advantages of high wear resistance and light weight. This invention, through noise testing, shows that compared to devices without vibration damping and noise reduction structures, the overall noise can be reduced by 30-35 decibels, the vibration amplitude is reduced by more than 30%, and the service life of components is extended by about 50%. The tailstock assembly adopts a coaxial stepped shaft design, with the first to fourth shafts integrally formed and the outer diameter gradually changing to form a stable rigid support frame, ensuring the coaxiality of each component (error <0.015mm) and reducing vibration caused by eccentricity. Sound-absorbing cotton is embedded in the mounting groove. When high-speed airflow (approximately 30 m / s) passes through, the sound waves are reflected and converted into heat energy through friction in the pores, reducing noise by approximately 15-20 decibels. The fourth elastic washer is interference-fitted to the fourth shaft to absorb radial vibration of the tailstock. The third elastic washer buffers the impact on the contact surface between the tailstock and the vibration valve seat, reducing vibration transmission rate by 40%. The damping rings are spaced along the axial direction, increasing the structural damping ratio to 0.08. The exhaust holes (φ4mm, 4 evenly distributed circumferentially) distribute the decelerated airflow. Dispersed exhaust prevents concentrated exhaust from causing whistling. The upper pressure spring connects the support cylinder positioning ring and the tailstock, while the lower pressure spring balances the vibration cylinder and the lower pressure spring positioning ring. The two springs work together to reduce piston return impact by 60%. The buffer pad is embedded in the groove to provide damping when the vibration cylinder has radial displacement (amplitude ≤ 0.1mm), shortening the vibration decay time to 0.003 seconds. The clamp positioning ring provides precise guidance for the tool, ensuring that the coaxiality error of the blade reciprocating motion is < 0.015mm, and improving the cutting accuracy to ±0.03mm. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure provided in an embodiment of the present utility model; Figure 2 This is a cross-sectional structural schematic diagram provided in an embodiment of the present utility model; Figure 3 This is a partial structural schematic diagram provided by an embodiment of the present utility model; Figure 4 This is a schematic diagram of the main structure of the tailstock provided in an embodiment of this utility model.

[0018] In the diagram: 1. Lower compression spring positioning ring; 2. Lower compression spring body; 3. Vibration cylinder body; 4. First buffer pad; 5. Second buffer pad; 6. Upper compression spring; 7. Fifth elastic washer; 8. Third elastic washer; 9. Fourth elastic washer; 10. Sound-absorbing cotton; 11. Tailstock body; 111. First shaft; 112. Second shaft; 113. Third shaft; 114. Fourth shaft; 115. Vent hole; 12. Piston cylinder body; 13. First elastic washer; 14. Second elastic washer; 15. Tailstock muffler; 16. Vibration valve seat; 17. Air nozzle connector; 18. Piston body; 19. Piston rod; 20. Lower spring sleeve; 21. Blade cover spring; 22. Lower protective cover; 23. Clamp positioning ring; 24. Blade positioning clamp; 25. Snap ring; 26. Valve core; 27. Intake rod; 28. Cylinder body positioning ring. Detailed Implementation

[0019] To further understand the utility model content, features and effects of this utility model, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0020] The structure of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] refer to Figures 1 to 4As shown in the figure, a pneumatic cutting device provided by this utility model includes a vibration valve seat 16 and a piston assembly installed in the vibration valve seat 16. A cutter assembly is connected to the right end of the piston assembly, and an air intake assembly is connected to the left end of the piston assembly. The air intake assembly includes a tailstock body 11 and an air nozzle connector 17. The tailstock body 11 includes a first shaft 111, a second shaft 112, a third shaft 113, and a fourth shaft 114, which are coaxially arranged and integrally formed from right to left. The right end of the first shaft 111 is connected to the piston assembly, and the left end of the fourth shaft 114 is connected to the air nozzle connector 17. A plurality of elastic washers for shock absorption are installed on the first shaft 111, the second shaft 112, the third shaft 113, and the fourth shaft 114. The elastic washers include a first elastic washer 13, a second elastic washer 14, a third elastic washer 15, a fourth elastic washer 16, a fifth elastic washer 17, and a sixth elastic washer 18. The device includes an elastic washer 8, a fourth elastic washer 9, and a fifth elastic washer 7. A vent hole 115 is provided on the tailstock body 11, axially penetrating the first shaft 111, the second shaft 112, the third shaft 113, and the fourth shaft 114. A tailstock muffler 15 is fitted onto the fourth shaft 114. The right end of the tailstock muffler 15 has a mounting groove for installing sound-absorbing cotton 10, and the mounting groove communicates with the vent hole 115. The left end of the piston assembly has a groove for installing an upper compression spring 6. The upper compression spring 6 is fitted onto the first shaft 111, and its left end abuts against the right end face of the second shaft 112. A lower compression spring body 2 is installed on the right end of the piston assembly, extending to the inner wall of the right end of the vibration valve seat 16. A buffer pad is installed between the vibration valve seat 16 and the piston assembly. The buffer pad includes a first buffer pad 4 and a second buffer pad 5.

[0022] Specifically, the first shaft 111, the second shaft 112, the third shaft 113 and the fourth shaft 114 are arranged in a coaxial stepped structure. The first shaft 111, the second shaft 112, the third shaft 113 and the fourth shaft 114 are arranged sequentially from left to right along the axial direction and are fixedly connected as one unit.

[0023] Specifically, a fifth elastic washer 7 is fitted on the second shaft 112, and the fifth elastic washer 7 is sandwiched between the second shaft 112 and the inner wall of the vibration valve seat 16. A groove for installing a fourth elastic washer 9 is opened on the inner wall of the tailstock muffler 15. The fourth elastic washer 9 is interference-fitted onto the fourth shaft 114. A groove for installing a third elastic washer 8 is opened on the right end face of the tailstock muffler 15. The right end face of the third elastic washer 8 is in elastic contact with the left end face of the third shaft 113.

[0024] Specifically, the piston assembly includes a vibrating cylinder 3 located within a vibrating valve seat 16, a piston cylinder 12 installed within the vibrating cylinder 3, an extension rod extending axially from the right end of the piston cylinder 12, the extension rod of the piston cylinder 12 passing through the right end face of the vibrating cylinder 3, a piston body 18 slidably connected axially within the piston cylinder 12, a piston rod 19 coaxially fixed to the right end of the piston body 18, the piston rod 19 slidably connected within the extension rod of the piston cylinder 12, the first buffer pad 4 and the second buffer pad 5 are both sleeved on the outer wall of the vibrating cylinder 3, and a plurality of buffer pad grooves are formed on the inner wall of the vibrating valve seat 16, with the outer ring of the buffer pad extending into the buffer pad grooves; The left end of the piston cylinder 12 is connected to a valve core 26 installed in the vibrating cylinder 3. The piston assembly also includes an air intake rod 27 installed in the vibrating cylinder 3 and a cylinder positioning ring 28 threaded to the left end of the vibrating cylinder 3. The left end of the air intake rod 27 passes through the cylinder positioning ring 28 and extends into the through hole of the tailstock body 11. The left end of the air intake rod 27 is connected to the valve core 26.

[0025] Specifically, a lower pressure spring positioning ring 1 is fixedly provided inside the vibration valve seat 16. The lower pressure spring positioning ring 1 is coaxially sleeved on the outside of the extension rod of the piston cylinder 12. The left end face of the lower pressure spring positioning ring 1 is provided with an annular first lower pressure spring groove. The right end face of the vibration cylinder 3 is provided with a second lower pressure spring groove coaxial with the first lower pressure spring groove. The left end of the lower pressure spring is embedded in the first lower pressure spring groove and the right end is embedded in the second lower pressure spring groove. The outer diameter of the lower pressure spring is compatible with the inner diameter of the corresponding groove.

[0026] Specifically, the outer wall of the tailstock muffler 15 is provided with a number of damping rings spaced axially, and the outer wall of the tailstock muffler 15 is provided with a number of exhaust holes that communicate with the mounting groove of the sound-absorbing cotton 10 in the radial direction.

[0027] Specifically, a plurality of copper sleeves are provided between the piston rod 19 and the piston cylinder 12, and the copper sleeves are fixed to the inner wall of the extension rod of the piston cylinder 12, and the piston rod 19 is slidably connected in the copper sleeves.

[0028] Specifically, a lower spring sleeve 20 is fitted on the right end of the vibration valve seat 16. A blade cover spring 21 extending axially to the vibration valve seat 16 is fixed on the outer wall of the lower spring sleeve 20. A lower protective cover 22 is fixed inside the lower spring sleeve 20. An opening for the cutter to pass through is provided on the lower protective cover 22. A groove for installing a first elastic washer 13 is provided on the inner wall of the lower protective cover 22. The inner wall of the first elastic washer 13 is in contact with the outer wall of the vibration valve seat 16.

[0029] Specifically, the cutter head assembly is fixedly connected to the right end of the piston rod 19. The cutter head assembly includes a clamping positioning ring 23 fixedly connected to the vibration valve seat 16, a blade positioning clamp 24 slidably connected within the clamping positioning ring 23, and a blade fixedly connected to the blade positioning clamp 24. The blade positioning clamp 24 is fixedly connected to the right end of the piston rod 19. The blade positioning clamp 24 has an axial blade groove and a piston rod 19 groove. The blade positioning clamp 24 has bolt holes that extend radially to the blade groove and the piston rod 19 groove. By tightening the bolts, the piston rod 19 and the blade are pressed and fixed on the blade positioning clamp 24. The piston rod 19 drives the blade positioning clamp 24 to reciprocate axially within the clamping positioning ring 23.

[0030] Specifically, a second elastic washer 14 is installed inside the first shaft 111. The second elastic washer 14 serves a sealing function and is sleeved on the air intake rod 27. A retaining ring 25 for fixing the second elastic washer 14 is also installed inside the first shaft 111.

[0031] The working principle of this utility model: In operation, compressed gas enters through the nozzle connector 17, passes through the axial through hole of the fourth shaft 114 of the tailstock body 11, and enters the valve core 26 through the left end of the inlet rod 27. The gas then enters the piston cylinder 12 through the upper and lower valve cores 26. At this time, the gas is located on the left side of the piston body 18, pushing the piston body 18 to the right. The piston body 18 drives the piston rod 19 to the right, which in turn drives the blade positioning fixture 24 to the right. The blade positioning fixture 24 moves the blade closer to the workpiece. When the pressure difference reaches the threshold, the elastic valve core 26 switches to the second state. The gas flows through the valve core 26 into the sealed gap between the valve core 26 and the vibrating cylinder 3 and enters the piston cylinder 12. At this time, the compressed gas enters the right side of the piston body 18, thereby pushing the piston body 18 to the left. The blade moves away from the workpiece, forming a reciprocating motion (the valve core action is existing technology). When the piston body 18 returns, the exhaust gas flows through the open gap between the piston cylinder 12 and the vibration cylinder 3 to the tailstock. It then enters the sound-absorbing cotton 10 mounting groove of the tailstock silencer 15 through the vent holes 115 of the second shaft 112 and the third shaft 113. When the high-speed airflow passes through the sound-absorbing cotton 10, the sound waves are dissipated by friction in the pores. The compressed gas continuously drives the cutting through the air nozzle connector 17 → tailstock through hole → valve core 26 → piston cylinder 12. The exhaust gas is discharged through the vent hole 115 → sound-absorbing cotton 10 → multi-stage silencer chamber, forming a continuous working cycle. When the blade wears and the vibration increases, the elastic buffer structure, such as the elastic washer, the shock absorber ring, and the compression spring, dissipates energy through deformation, ensuring that the cutting accuracy is maintained at ±0.05mm.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic cutting device, characterized in that: The device includes a vibration valve seat (16) and a piston assembly installed inside the vibration valve seat (16). A cutter assembly is connected to the right end of the piston assembly, and an air intake assembly is connected to the left end of the piston assembly. The air intake assembly includes a tailstock body (11) and an air nozzle connector (17). The tailstock body (11) includes a first shaft (111), a second shaft (112), a third shaft (113), and a fourth shaft (114), which are coaxially arranged and integrally formed from right to left. The right end of the first shaft (111) is connected to the piston assembly, and the left end of the fourth shaft (114) is connected to the air nozzle connector (17). Several elastic washers for vibration damping are installed on each of the first shaft (111), second shaft (112), third shaft (113), and fourth shaft (114). The elastic washers include a first elastic washer (13), a second elastic washer (14), a third elastic washer (8), a fourth elastic washer (9), and a... The fifth elastic washer (7) has a vent hole (115) on the tailstock body (11) that runs axially through the first shaft (111), the second shaft (112), the third shaft (113), and the fourth shaft (114). A tailstock muffler (15) is fitted on the fourth shaft (114). The right end of the tailstock muffler (15) has a mounting groove for installing sound-absorbing cotton (10), and the mounting groove is connected to the vent hole (115). The piston assembly The left end of the piston assembly has a groove for installing the upper compression spring (6). The upper compression spring (6) is sleeved on the first shaft (111) and its left end abuts against the right end face of the second shaft (112). The right end of the piston assembly is equipped with the lower compression spring body (2). The lower compression spring body (2) extends to the right end inner wall of the vibration valve seat (16). A buffer pad is installed between the vibration valve seat (16) and the piston assembly. The buffer pad includes a first buffer pad (4) and a second buffer pad (5).

2. The pneumatic cutting device as described in claim 1, characterized in that: The first shaft (111), the second shaft (112), the third shaft (113) and the fourth shaft (114) are arranged in a coaxial stepped structure. The first shaft (111), the second shaft (112), the third shaft (113) and the fourth shaft (114) are arranged sequentially from left to right along the axial direction and fixed together as one unit.

3. The pneumatic cutting device as described in claim 1, characterized in that: A fifth elastic washer (7) is fitted on the second shaft (112). The fifth elastic washer (7) is sandwiched between the inner wall of the second shaft (112) and the vibration valve seat (16). A groove for installing a fourth elastic washer (9) is opened on the inner wall of the tailstock muffler (15). The fourth elastic washer (9) is interference-fitted onto the fourth shaft (114). A groove for installing a third elastic washer (8) is opened on the right end face of the tailstock muffler (15). The right end face of the third elastic washer (8) is in elastic contact with the left end face of the third shaft (113).

4. The pneumatic cutting device as described in claim 1, characterized in that: The piston assembly includes a vibrating cylinder (3) located inside a vibrating valve seat (16), a piston cylinder (12) is installed inside the vibrating cylinder (3), the right end of the piston cylinder (12) extends axially to form an extension rod, the extension rod of the piston cylinder (12) passes through the right end face of the vibrating cylinder (3), a piston body (18) is slidably connected in the piston cylinder (12) along the axial direction, a piston rod (19) is coaxially fixed to the right end of the piston body (18), the piston rod (19) is slidably connected in the extension rod of the piston cylinder (12), the first buffer pad (4) and the second buffer pad (5) are both sleeved on the outer wall of the vibrating cylinder (3), and a plurality of buffer pad grooves are opened on the inner wall of the vibrating valve seat (16) and the outer ring of the buffer pad extends into the buffer pad groove; The left end of the piston cylinder (12) is connected to a valve core (26) installed in the vibrating cylinder (3). The piston assembly also includes an air intake rod (27) installed in the vibrating cylinder (3) and a cylinder positioning ring (28) threaded to the left end of the vibrating cylinder (3). The left end of the air intake rod (27) passes through the cylinder positioning ring (28) and extends into the through hole of the tailstock body (11). The left end of the air intake rod (27) is connected to the valve core (26).

5. A pneumatic cutting device as described in claim 4, characterized in that: The vibration valve seat (16) is fixedly provided with a lower pressure spring positioning ring (1). The lower pressure spring positioning ring (1) is coaxially sleeved on the outside of the extension rod of the piston cylinder (12). The left end face of the lower pressure spring positioning ring (1) is provided with an annular first lower pressure spring groove. The right end face of the vibration cylinder (3) is provided with a second lower pressure spring groove coaxial with the first lower pressure spring groove. The left end of the lower pressure spring is embedded in the first lower pressure spring groove and the right end is embedded in the second lower pressure spring groove. The outer diameter of the lower pressure spring is compatible with the inner diameter of the corresponding groove.

6. The pneumatic cutting device as described in claim 1, characterized in that: The outer wall of the tailstock muffler (15) is provided with several damping rings spaced axially, and the outer wall of the tailstock muffler (15) is provided with several exhaust holes that communicate with the mounting groove of the sound-absorbing cotton (10) in the radial direction.

7. A pneumatic cutting device as described in claim 4, characterized in that: A plurality of copper sleeves are provided between the piston rod (19) and the piston cylinder (12), and the copper sleeves are fixed to the inner wall of the extension rod of the piston cylinder (12), and the piston rod (19) slides in the copper sleeves.

8. The pneumatic cutting device as described in claim 1, characterized in that: The right end of the vibration valve seat (16) is fitted with a lower spring sleeve (20). A blade cover spring (21) extending axially to the vibration valve seat (16) is fixed on the outer wall of the lower spring sleeve (20). A lower protective cover (22) is fixed inside the lower spring sleeve (20). A through-hole for the cutter to pass through is opened on the lower protective cover (22). A groove for installing a first elastic washer (13) is opened on the inner wall of the lower protective cover (22). The inner wall of the first elastic washer (13) is in contact with the outer wall of the vibration valve seat (16).

9. A pneumatic cutting device as described in claim 4, characterized in that: The cutter head assembly is fixedly connected to the right end of the piston rod (19). The cutter head assembly includes a clamp positioning ring (23) fixedly connected to the vibration valve seat (16), a blade positioning clamp (24) slidingly connected in the clamp positioning ring (23), and a blade fixedly connected to the blade positioning clamp (24). The blade positioning clamp (24) is fixedly connected to the right end of the piston rod (19). The blade positioning clamp (24) has an axial blade groove and a piston rod (19) groove. The blade positioning clamp (24) has bolt holes that extend radially to the blade groove and the piston rod (19) groove. By tightening the bolts, the piston rod (19) and the blade are pressed and fixed on the blade positioning clamp (24). The piston rod (19) drives the blade positioning clamp (24) to reciprocate axially in the clamp positioning ring (23).

10. A pneumatic cutting device as described in claim 4, characterized in that: The first shaft (111) is equipped with a second elastic washer (14), which serves as a seal and is fitted onto the air intake rod (27). The first shaft (111) is also equipped with a retaining ring (25) for fixing the second elastic washer (14).

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