Dust-extractable cutting device

Abstract

A dust-extractable cutting device, comprising: a housing (1), a tool changing actuator (2), a driving member (3), a turbine (4), and a dust extraction hood (5). The housing is provided with a duct (131), the tool changing actuator being arranged inside the housing; a cutting tool (23) is mounted on the tool changing actuator; the tool changing actuator comprises a tool changing main shaft (21) and a hydraulic device (22); the driving member is provided with a front shaft end (31) and a rear shaft end (32), the front shaft end being connected to the tool changing main shaft; the turbine is mounted on the rear shaft end; the dust extraction hood is arranged below the housing, and is detachably connected to the housing. The cutting device has a dust extraction function while cutting, and has an automatic tool changing function, thereby improving working efficiency.

Description

A dust-collecting cutting device Related applications

[0001] This disclosure claims priority to Chinese Patent Application No. 2025100489340, filed on January 13, 2024, entitled “A Dust-Collecting Cutting Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the technical field of cutting equipment, and more specifically to a dust-collecting cutting device. Background Technology

[0003] In wood processing and other fields, it is common to cut boards, composite boards, and other sheet materials using milling cutters and other cutting tools. This process generates a large amount of dust and debris. On the one hand, this dust and debris can easily be inhaled by operators, affecting their health; on the other hand, it causes environmental pollution. Therefore, it is necessary to clean up the dust and debris promptly. However, existing cutting devices cannot simultaneously perform both cutting and dust collection functions in practical applications.

[0004] Therefore, there is an urgent need to improve the existing cutting equipment. Summary of the Invention

[0005] To address the shortcomings of related technologies, this disclosure provides a dust-collecting cutting device that can perform dust collection while cutting, and also features an automatic blade changer, thereby improving work efficiency. The implementation of this technical solution is as follows:

[0006] A dust-collecting cutting device includes: a housing, a tool changer actuator, a drive unit, a turbine, and a dust collection hood; the housing has a duct, the tool changer actuator is disposed inside the housing, the tool changer actuator is equipped with a cutting blade, and the tool changer actuator includes a tool changer spindle and a hydraulic device; the drive unit has a front shaft end and a rear shaft end, the front shaft end being connected to the tool changer spindle; the turbine is mounted on the rear shaft end; the dust collection hood is disposed below the housing, and the dust collection hood is detachably connected to the housing.

[0007] Preferably, the tool changing spindle includes a shaft body, a pull rod, and a coupling; the pull rod is disposed inside the shaft body and is used to tighten and loosen the cutting tool; the pull rod and the shaft body form a first pressure chamber; a second pressure chamber is disposed inside the pull rod; a vent hole is provided on the pull rod, and the vent hole connects the first pressure chamber and the second pressure chamber; the coupling is fixedly connected to the shaft body; a shaft cover is sleeved on the shaft body; in the working state, the hydraulic device abuts against the shaft cover, exerts downward pressure on the shaft cover, and pushes the pull rod downward.

[0008] Preferably, a valve seat is provided at one end of the second pressure chamber, the valve seat is fixed inside the pull rod, and an inflation valve is installed on the valve seat. The air nozzle of the inflation valve is placed inside the second pressure chamber. The inflation valve injects high-pressure nitrogen into the second pressure chamber through an external air source. The high-pressure nitrogen enters the first pressure chamber from the second pressure chamber through the vent hole. A first sealing ring is provided at both ends of the first pressure chamber, and a sealing cap is provided at both ends of the second pressure chamber.

[0009] Preferably, the hydraulic device includes a cylinder body with a through hole and an inner cylinder sleeved inside the through hole. The inner cylinder and the cylinder body form a third pressure chamber. The third pressure chamber is injected with hydraulic oil from the outside to drive the inner cylinder to move downward, so that the inner cylinder abuts against the shaft cover.

[0010] Preferably, the tool changing spindle further includes a protective shell, and a first spring is provided between the protective shell and the inner cylinder; the purpose is to prevent the inner cylinder from directly contacting the shaft cover during cutting operations.

[0011] Preferably, a second spring is provided between the shaft cover and the end of the coupling to prevent the coupling from shaking significantly due to high-speed rotation during the cutting operation, thereby keeping the shaft cover stable.

[0012] Preferably, the system further includes a rotating component, which comprises a first cylinder and a second cylinder. Both the first cylinder and the second cylinder are mounted on the housing. The output shaft of the first cylinder is fitted with a connector, and the outer wall of the second cylinder is fixedly connected to the connector. The output shaft of the second cylinder is connected to the dust collection hood.

[0013] Preferably, the rotating component further includes a guide rod, which is disposed on the housing and is fixedly connected to the connector.

[0014] Preferably, the hydraulic device is provided with an oil inlet, which passes through the cylinder body and penetrates the housing.

[0015] Preferably, the tool changing spindle further includes several steel balls, and the pull rod is provided with several receiving holes, each of the several receiving holes being used to cooperate with the several steel balls.

[0016] Compared with related technologies, this disclosure has the following beneficial effects:

[0017] 1. When the cutting device disclosed herein is in use, the drive unit is started, which drives the cutting blade and the turbine to rotate; the dust airflow generated during cutting enters the housing through the dust suction hood, flows into the turbine through the duct, and finally flows out from the turbine, realizing the collection and treatment of dust. This technical solution can collect the dust and debris generated during the cutting process in real time, reduce subsequent cleaning work, and improve the overall work efficiency.

[0018] 2. When changing the blade, the cutting device of this disclosure moves the inner cylinder by injecting or releasing hydraulic oil, which in turn drives the shaft cover and the pull rod to move. The extension and retraction of the pull rod is achieved by changing the volume of high-pressure nitrogen in the first pressure chamber. At the same time, the pull rod, together with the steel ball, clamps and releases the cutting blade.

[0019] 3. In the cutting device of this disclosure, during blade changing, the first cylinder actuates first, causing the dust collection hood to move downwards, so that the top of the dust collection hood is lower than the position of the cutting blade. Subsequently, the second cylinder actuates, causing the dust collection hood to rotate 90 degrees, providing ample space for the blade changing operation. The rotating components allow the dust collection hood to move and rotate quickly, providing space for the blade changing operation, thereby accelerating the blade changing speed and improving overall work efficiency. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0021] Figure 1 is an exploded view of the cutting apparatus of this disclosure;

[0022] Figure 2 is a half-sectional view of the cutting device of this disclosure;

[0023] Figure 3 is a cross-sectional view of the tool changer actuator of this disclosure;

[0024] Figure 4 is a half-sectional view of the tool changing spindle of this disclosure;

[0025] Figure 5 is a schematic diagram of the structure of the shell of this disclosure;

[0026] Figure 6 is a schematic diagram of the structure of the dust hood disclosed herein;

[0027] Figure 7 is a schematic diagram of the turbine structure disclosed herein;

[0028] Figure 8 is a schematic diagram of the structure of the tie rod of this disclosure;

[0029] Figure 9 is a schematic diagram of the structure of the rotating component of this disclosure;

[0030] Figure 10 is a structural diagram of the tool changing application scenario disclosed herein.

[0031] Figure labeling: 100, workstation; 200, tool magazine;

[0032] 1. Housing; 11. Outer shell; 12. Inner shell; 13. Partition; 131. Duct; 2. Tool changer actuator; 21. Tool changer spindle; 211. Protective shell; 2111. First spring; 212. Shaft; 2121. First pressure chamber; 2122. First sealing ring; 2123. Bayonet; 2124. Receiving cavity; 213. Tie rod; 2131. Second pressure chamber; 2312. Vent hole; 2313. Valve seat; 2314. Air charging valve; 2315. Sealing cover; 2316. Receiving hole; 214. Coupling; 215. Steel ball; 216. 2161. Shaft cover; 22. Second spring; 22. Hydraulic device; 221. Cylinder body; 2211. Third pressure chamber; 222. Inner cylinder; 223. Oil inlet; 23. Cutting blade; 3. Drive component; 31. Front shaft end; 32. Rear shaft end; 4. Turbine; 41. Volute casing; 42. Impeller; 43. Tail cone; 5. Dust hood; 51. Base; 52. Main cover; 53. Air nozzle assembly; 531. Air pipe; 532. Air nozzle; 54. Telescopic adjustment ring; 6. Rotating component; 61. First cylinder; 62. Second cylinder; 63. Connecting component; 64. Guide rod. Detailed Implementation

[0033] The following drawings disclose several embodiments of this disclosure. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this disclosure. That is, in some embodiments of this disclosure, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and parts will be shown in the drawings in a simple schematic manner.

[0034] It should be noted that all directional indications in this disclosure, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, the use of terms such as "first" and "second" in this disclosure is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this disclosure. They are merely used to distinguish items or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this disclosure.

[0036] This disclosure relates to a dust-collecting cutting device with an automatic tool changing function. Referring to Figure 10, one application scenario is that the cutting device is installed on a cutting machine workstation 100, which is equipped with a tool magazine 200. This type of tool changing device can be moved from the workstation 100 to the tool magazine 200 to change the tool. The specific tool changing action is described in detail in the following embodiments.

[0037] The embodiments of this disclosure provide a dust-collecting cutting device, as shown in Figures 1-9, comprising: a housing 1, a tool changer 2, a drive unit 3, a turbine 4, and a dust collection hood 5; the housing 1 has a duct 131, the tool changer 2 is disposed inside the housing 1, the tool changer 2 is equipped with a cutting blade 23, the tool changer 2 includes a tool changer spindle 21 and a hydraulic device 22; the drive unit 3 has a front shaft end 31 and a rear shaft end 32, the front shaft end 31 is connected to the tool changer spindle 21; the turbine 4 is mounted on the rear shaft end 32; the dust collection hood 5 is disposed below the housing 1, and the dust collection hood 5 is detachably connected to the housing 1.

[0038] The drive unit 3 specifically employs a dual-axis motor. When the device is in operation, the drive unit 3 starts, driving the cutting blade 23 and the turbine 4 to rotate. This causes the airflow of dust generated during cutting to enter the housing 1 through the dust suction hood 5. The dust flows into the turbine 4 through the duct 131 and finally flows out from the turbine 4, thus enabling the dust to be collected and processed. This disclosure can be used in applications such as sheet metal cutting, but is not limited to sheet metal cutting. It can be modified and applied to any equipment that generates dust or debris.

[0039] In some embodiments, referring to FIG5, the housing 1 includes an outer shell 11, an inner shell 12, and partitions 13. The outer shell 11 is a cylindrical structure with openings at both ends and a rectangular cross-section. The inner shell 12 is installed inside the outer shell 11 and is also cylindrical with openings at both ends. A gap is provided between the inner shell 12 and the outer shell 11. Multiple partitions 13 are provided and are arranged in the gap between the inner shell 12 and the outer shell 11, along the length direction of the inner shell 12 and the outer shell 11. The partitions 13 are fixedly connected to both the inner shell 12 and the outer shell 11, so that the inner shell 12 can be kept relatively fixed in position relative to the outer shell 11. A duct 131 is formed between adjacent partitions 13 for dust to pass through.

[0040] In some embodiments, referring to Figures 3-4, the tool changing spindle 21 includes a shaft body 212, a pull rod 213, a coupling 214, and several steel balls 215. The pull rod 213 is disposed inside the shaft body 212, and both ends of the pull rod 213 are provided with openings. The pull rod 213 is used to tighten and loosen the cutting blade 23. A first pressure chamber 2121 is formed between the pull rod 213 and the shaft body 212. A second pressure chamber 2131 is provided inside the pull rod 213. A vent hole 2312 is provided on the pull rod 213, and the vent hole 2312 connects the first pressure chamber 2121 and the second pressure chamber 2131. The coupling 214 is fixedly connected to the shaft body 212. A shaft cover 216 is sleeved on the shaft body 212. In the tool changing state, the hydraulic device 22 abuts against the shaft cover 216, exerting downward pressure on the shaft cover 216 and pushing the pull rod 213 downward.

[0041] Specifically, in the cutting state, the cutting blade 23 is installed inside the tool changing spindle 21. Through the cooperation of the pull rod 213 and the steel ball 215, the cutting blade 23 is clamped, allowing it to rotate and cut the plate. At this time, the pull rod 3 is in an upward retracted state. In the tool changing state, the hydraulic device 22 operates, moving downwards and applying pressure to the shaft cover 216. The shaft cover 216 drives the pull rod 213 downwards, causing the steel ball 215 to no longer restrict the cutting blade 23, thus allowing the cutting blade 23 to move from the pull rod. The blade detaches at point 213, completing the blade retraction action. In addition, when the pull rod moves downward, the high-pressure nitrogen gas in the first pressure chamber is compressed (i.e., the volume of the first pressure chamber decreases). When the new cutting blade 23 is located below the tool changing spindle 21, the hydraulic device 22 releases pressure, and the high-pressure nitrogen gas in the first pressure chamber rebounds (i.e., the first pressure chamber restores its volume), thereby causing the pull rod 213 to rebound. During the rebound process, the steel ball 215 re-engages with the pull rod 213 to clamp the handle of the new cutting blade 23, completing the tool changing action.

[0042] In some embodiments, referring to Figures 2-4, a valve seat 2313 is provided at one end of the second pressure chamber 2131. The valve seat 2313 is fixed inside the pull rod 213. An inflation valve 2314 is installed on the valve seat 2313. The air nozzle 532 of the inflation valve 2314 is placed inside the second pressure chamber 2131. The inflation valve 2314 injects high-pressure nitrogen into the second pressure chamber 2131 through an external air source. The high-pressure nitrogen enters the first pressure chamber 2121 from the second pressure chamber 2131 through the vent hole 2312. A first sealing ring 2122 is provided at both ends of the first pressure chamber 2121, and a sealing cap 2315 is provided at both ends of the second pressure chamber 2131. It should be noted that the high-pressure nitrogen has already been injected into the first pressure chamber 2121 and the second pressure chamber 2131 through the inflation valve 2314 before the device is put into operation.

[0043] In some embodiments, referring to FIG3, the hydraulic device 22 includes a cylinder body 221, the cylinder body 221 is provided with a through hole, and an inner cylinder 222 is sleeved inside the through hole. The inner cylinder 222 and the cylinder body 221 form a third pressure chamber 2211. The third pressure chamber 2211 is injected with hydraulic oil from the outside to drive the inner cylinder 222 to move downward, so that the inner cylinder 222 abuts against the shaft cover 216.

[0044] In some embodiments, referring to FIG3, the hydraulic device 22 is provided with an oil inlet 223, which passes through the cylinder body 221 and penetrates the housing 1.

[0045] Specifically, in the tool changing operation, the external hydraulic pump injects hydraulic oil into the third pressure chamber 2211 through the inlet 223, increasing the volume of the third pressure chamber 2211. This drives the inner cylinder 222 downward, causing it to abut against the shaft cover 216. At this time, the pressure in the third pressure chamber 2211 is greater than the pressure in the first pressure chamber 2121 and the second pressure chamber 2131. The high-pressure nitrogen in the first pressure chamber 2121 is compressed, which in turn drives the pull rod 213 downward. The cutting blade 23 disengages from the pull rod 213, completing the tool retraction action. Furthermore, the purpose of setting the second pressure chamber 2131 is to relieve the pressure in the first pressure chamber 2121. In the tool loading operation, the external hydraulic pump withdraws the hydraulic oil, causing the high-pressure nitrogen in the first pressure chamber 2121 to rebound, which in turn drives the pull rod 213 upward. The pull rod 213, in conjunction with the steel ball 215, clamps the cutting blade 23, completing the tool changing action.

[0046] In some embodiments, referring to Figures 3-4, the tool-changing spindle 21 further includes a protective shell 211, and a first spring 2111 is provided between the protective shell 211 and the inner cylinder 222; the purpose is to prevent the inner cylinder 222 from directly contacting the shaft cover 216 during cutting operations. Specifically, during cutting operations, the shaft cover 216 rotates continuously with the shaft body 212, while the inner cylinder 222 does not rotate with the drive component 3. To prevent the inner cylinder 222 from continuously contacting the shaft cover 216, a first spring 2111 is provided between the protective shell 211 and the inner cylinder 222 to reduce mechanical contact and improve the service life of the device.

[0047] In some embodiments, referring to Figures 3-4, a second spring 2161 is provided between the shaft cover 216 and the end of the coupling 214. This is to prevent the coupling 214 from shaking significantly due to high-speed rotation during cutting operations, thus keeping the shaft cover 216 stable. Specifically, the shaft cover 216 can slide relative to the shaft body 212 under external force. During high-speed rotation, the shaft cover 216 will inevitably shake significantly. The second spring 2161 between the shaft cover 216 and the coupling 214 ensures that the shaft cover 216 abuts against the pull rod 213, maintaining structural stability.

[0048] In some embodiments, referring to Figure 8, the pull rod 213 is provided with a plurality of receiving holes 2316, which are through holes. Each of the plurality of receiving holes 2316 is used to cooperate with a plurality of steel balls 215. Specifically, the receiving hole 2316 includes a straight section and a narrowed section in the axial direction. The straight section is close to the outer wall of the pull rod 213, and the diameter of the straight section is larger than the diameter of the steel ball 215. The purpose of the straight section is to allow the steel ball 215 to slide smoothly in the receiving hole 2316. The narrowed section is close to the inner wall of the pull rod 213, and the diameter of the narrowed section is smaller than the diameter of the steel ball 215. This prevents the steel ball 215 from falling into the pull rod 213, which would prevent the pull rod 213 from clamping the cutting blade 23 and thus prevent the cutting function from being realized.

[0049] In some embodiments, referring to Figure 4, the shaft 212 is further provided with a bayonet 2123 and a receiving cavity 2124, with the receiving cavity 2124 located above the bayonet 2123. The receiving cavity 2124 has rounded ends, the purpose of which is to allow the steel ball 215 to smoothly enter and exit the receiving cavity 2124. Specifically, the bayonet 2123 is used to connect the cutting blade 23 to the tool-changing spindle 21, ensuring stable force transmission during processing. When the device is running at high speed, the steel ball 215 is mounted on the receiving hole 2316 of the pull rod 213, and is secured with the pull rod 213. The handle of the cutting blade 23 is clamped by the tool changing spindle 21. In the tool changing operation state, the pull rod 213 moves downward, causing the steel ball 215 to move down to the receiving cavity 2124. At this time, part of the steel ball 215 is placed in the receiving cavity 2124 and the other part is still placed in the receiving hole 2316, so that the steel ball 215 no longer clamps the cutting blade 23, and the cutting blade 23 can be disengaged from the pull rod 213, completing the blade retraction action. When the handle of the new cutting blade 23 is located in the receiving cavity 2124, the pull rod 213, together with the steel ball 215, drives the cutting blade 23 to move upward, and part of the steel ball 215 will re-clamp the handle of the cutting blade 23, realizing the clamping of the cutting blade 23.

[0050] In some embodiments, referring to Figure 6, the dust hood 5 includes a base 51, a main hood body 52, an air nozzle 532 assembly 53, and a telescopic adjustment ring 54. The main hood body 52 is located below the base 51. The air nozzle 532 assembly 53 is installed inside the main hood body 52 and includes multiple air pipes 531 and multiple air nozzles 532. The telescopic adjustment ring 54 is rotatably connected to the base 51 and the main hood body 52, respectively. Specifically, the multiple air pipes 531 and air nozzles 532 of the air nozzle 532 assembly 53 are evenly distributed around the cutting blade 23. Through an external air pump, the airflow blown from the air nozzles 532 encounters the working panel downwards, and the airflow rebounds, changing its direction to upwards. This lifts up the dust or debris generated when the cutting blade 23 cuts the plate, so that it can be sucked away upwards by the negative pressure generated by the turbine 4.

[0051] In some embodiments, referring to FIG9, a rotating component 6 is also included. The rotating component 6 includes a first cylinder 61 and a second cylinder 62. Both the first cylinder 61 and the second cylinder 62 are mounted on the housing 1. The output shaft of the first cylinder 61 is equipped with a connector 63. The outer wall of the second cylinder 62 is fixedly connected to the connector 63. The output shaft of the second cylinder 62 is connected to the dust collection cover 5.

[0052] Specifically, the first cylinder 61 is a linear cylinder and the second cylinder 62 is a rotary cylinder. When the device needs to change the blade, the first cylinder 61 drives the dust collection hood 5 to move downward, so that the top of the dust collection hood 5 is lower than the position of the cutting blade 23. Then the second cylinder 62 drives the dust collection hood 5 to rotate 90 degrees, so that the device has enough space to perform the blade changing action.

[0053] In some embodiments, referring to FIG9, the rotating component 6 further includes a guide rod 64, which is disposed on the housing 1 and fixedly connected to the connecting member 63. Specifically, the function of the guide rod 64 is to guide the output shaft of the first cylinder 61 to perform linear reciprocating motion, which helps to extend the service life of the first cylinder 61.

[0054] In some embodiments, referring to Figures 1 and 7, the turbine 4 includes a volute 41, an impeller 42, and a tail cone 43. The volute 41 is fixedly connected to the housing 1, the impeller 42 is connected to the rear shaft end 32 of the drive component 3, and the tail cone 43 is mounted on top of the impeller 42. Specifically, both ends of the volute 41 have openings, and dust enters the impeller 42 through the duct 131, is transported to the tail cone 43 by the high-speed rotation of the impeller 42, and then flows out of the turbine 4.

[0055] The working principle of the cutting device in this embodiment is as follows:

[0056] When the cutting device of this technical solution is in use, the drive unit 3 is started, which drives the cutting blade 23 and the turbine 4 to rotate; the dust airflow generated by cutting enters the housing 1 through the dust suction hood 5, flows into the turbine 4 through the duct 131, and finally flows out from the turbine 4, realizing the collection and treatment of dust. This technical solution can collect the dust and debris generated during the cutting process in real time, reduce the subsequent cleaning work, and improve the overall work efficiency.

[0057] When changing blades, the cutting device of this technical solution moves the inner cylinder 222 by injecting or releasing hydraulic oil, which in turn drives the shaft cover 216 and the pull rod 213 to move. The extension and retraction of the pull rod 213 is achieved by changing the volume of high-pressure nitrogen in the first pressure chamber 2121. At the same time, the pull rod 213, together with the steel ball 215, clamps and releases the cutting blade 23.

[0058] In this technical solution, during blade changing, the first cylinder 61 actuates first, causing the dust collection hood 5 to move downwards, so that the top of the dust collection hood 5 is lower than the position of the cutting blade 23. Subsequently, the second cylinder 62 actuates, causing the dust collection hood 5 to rotate 90 degrees, providing ample space for the blade changing operation. The rotating component 6 allows the dust collection hood 5 to move and rotate quickly, providing space for the blade changing operation, thereby accelerating the blade changing speed and improving overall work efficiency.

[0059] The above description is merely an embodiment of this disclosure and is not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of the claims of this disclosure.

Claims

1. A dust-collecting cutting device, characterized in that, include: The housing has a duct; A tool changer is disposed inside a housing. The tool changer is equipped with a cutting blade and includes a tool changer spindle and a hydraulic device. A drive unit having a front shaft end and a rear shaft end, the front shaft end being connected to a tool changing spindle; A turbine, which is mounted on the rear axle end; A dust hood is disposed at the bottom of the housing and is detachably connected to the housing.

2. The dust-collecting cutting device according to claim 1, characterized in that, The tool changing spindle includes a shaft body, a pull rod, and a coupling. The pull rod is disposed inside the shaft body and is used to tighten and loosen the cutting tool. A first pressure chamber is formed between the pull rod and the shaft body, and a second pressure chamber is provided inside the pull rod. A vent hole is provided on the pull rod, and the vent hole connects the first pressure chamber and the second pressure chamber. The coupling is fixedly connected to the shaft body, and a shaft cover is sleeved on the shaft body. In the working state, the hydraulic device abuts against the shaft cover, exerts downward pressure on the shaft cover, and pushes the pull rod downward.

3. The dust-collecting cutting device according to claim 2, characterized in that, The second pressure chamber has a valve seat at one end of its opening. The valve seat is fixed inside the pull rod and is equipped with an inflation valve. The air nozzle of the inflation valve is placed inside the second pressure chamber. The inflation valve injects high-pressure nitrogen into the second pressure chamber through an external air source. The high-pressure nitrogen enters the first pressure chamber from the second pressure chamber through the vent hole. The first pressure chamber has a first sealing ring at both ends, and the second pressure chamber has a sealing cap at both ends.

4. The dust-collecting cutting device according to claim 2, characterized in that, The hydraulic device includes a cylinder body with a through hole. An inner cylinder is fitted inside the through hole. The inner cylinder and the cylinder body form a third pressure chamber. Hydraulic oil is injected into the third pressure chamber from the outside to drive the inner cylinder to move downward, so that the inner cylinder abuts against the shaft cover.

5. The dust-collecting cutting device according to claim 4, characterized in that, The tool changing spindle also includes a protective shell, and a first spring is provided between the protective shell and the inner cylinder; the purpose is to prevent the inner cylinder from directly contacting the shaft cover during cutting operations.

6. The dust-collecting cutting device according to claim 2, characterized in that, A second spring is provided between the shaft cover and the end of the coupling to prevent the coupling from shaking significantly due to high-speed rotation during cutting operations, thus keeping the shaft cover stable.

7. The dust-collecting cutting device according to claim 1, characterized in that, It also includes a rotating component, which includes a first cylinder and a second cylinder. Both the first cylinder and the second cylinder are mounted on the housing. The output shaft of the first cylinder is equipped with a connector, and the outer wall of the second cylinder is fixedly connected to the connector. The output shaft of the second cylinder is connected to the dust collection hood.

8. The dust-collecting cutting device according to claim 7, characterized in that, The rotating component also includes a guide rod, which is disposed on the housing and is fixedly connected to the connector.

9. The dust-collecting cutting device according to claim 1, characterized in that, The hydraulic device is equipped with an oil inlet, which passes through the cylinder and the housing.

10. The dust-collecting cutting device according to claim 6, characterized in that, The tool changing spindle also includes several steel balls, and the pull rod has several receiving holes inside, each of which is used to cooperate with several of the steel balls.

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