Main shaft buffer structure, main shaft and PCB (Printed Circuit Board) processing equipment
By using fluid or elastic media to cushion the chuck in the spindle buffer structure, the problem of tool slippage and deflection when contacting the PCB board surface is solved, improving hole position accuracy and spindle stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANS CNC SCI & TECH
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-15
AI Technical Summary
Existing cutting tools are prone to slippage and deflection when in contact with the PCB board surface, resulting in deviations in hole positioning accuracy.
The spindle adopts a buffer structure, including a buffer component and a chuck. It uses a fluid or elastic medium to buffer the chuck, absorb the impact energy when the tool contacts the plate, and reduce slippage and deflection.
It effectively reduces tool deviation during machining, improves hole position accuracy, and is suitable for the stability of high-speed spindles.
Smart Images
Figure CN224239738U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of spindle technology, and in particular relates to a spindle buffer structure, a spindle, and PCB processing equipment. Background Technology
[0002] With the increasing density of electronic devices, PCB board thickness is constantly increasing, while drilling diameter is becoming smaller. To meet the requirements of deep hole machining, the cutting edge length of the machining tools needs to be increased accordingly, resulting in a significant decrease in their rigidity.
[0003] For cutting tools with low rigidity, when the tool contacts the PCB board surface, the reaction force generated in the Z-axis direction is borne by the tool itself. Under this reaction force, the tool is prone to slippage and deflection, making it difficult for the tool to maintain a vertical drilling path, resulting in deviations in hole position accuracy. Utility Model Content
[0004] The technical problem to be solved by this utility model is: to address the problem that existing cutting tools are prone to slippage and deflection when contacting the board surface, and to provide a spindle buffer structure, a spindle, and PCB processing equipment.
[0005] To solve the above-mentioned technical problems, on the one hand, this utility model provides a spindle buffer structure, including a buffer component and a collet; the buffer component is adapted to be installed in the spindle, one end of the collet is connected to the buffer component, and the other end of the collet is used to install a cutting tool;
[0006] When the cutting tool comes into contact with the plate to be processed, the chuck can move along the first direction, and the buffer can cushion the chuck.
[0007] Optionally, the buffer includes a buffer body and a buffer push rod, one end of the buffer push rod being movably connected to the buffer body, and the other end of the buffer push rod being connected to the clamp.
[0008] The chuck moves along the first direction, which can drive the buffer push rod to move within the buffer body. The fluid medium within the buffer body generates resistance to buffer the chuck.
[0009] Optionally, the buffer push rod includes a rod body and a piston, the piston being slidably connected to the interior of the buffer body, and the rod body being connected between the piston and the buffer push rod;
[0010] The chuck can push the buffer push rod to move away from the chuck along the first direction, and the piston squeezes the fluid medium to buffer the chuck through the resistance of the fluid medium.
[0011] Optionally, the buffer body is provided with a cavity, and the piston is disposed in the cavity to divide the cavity into a first cavity and a second cavity, the first cavity and the second cavity being in communication;
[0012] When the piston moves away from the chuck along the first direction, the fluid medium in the first cavity can enter the second cavity;
[0013] When the piston moves toward the clamp along the first direction, the fluid medium of the second cavity can enter the first cavity.
[0014] Optionally, the buffer further includes a reset member disposed within the buffer body, the reset member being used to push the buffer push rod to move along the first direction toward the direction of the clamp.
[0015] Optionally, a locking element is provided at one end of the clamp near the buffer, and the buffer push rod is connected to the locking element so that the buffer push rod is fixed relative to the clamp.
[0016] Optionally, the chuck is provided with a first connecting hole, the locking member is disposed in the first connecting hole, and the buffer push rod is located in the first connecting hole and passes through the locking member.
[0017] Optionally, a second connecting hole is provided at the end of the chuck away from the buffer member, and the second connecting hole is used to insert the cutting tool.
[0018] Optionally, the buffer is an elastic buffer, which is used to deform when the chuck moves along the first direction to buffer the chuck.
[0019] On the other hand, this utility model embodiment provides a spindle, including a housing, a rotor, a stator, and a spindle buffer structure as described above. The rotor and the stator are disposed inside the housing, the stator is sleeved outside the rotor, the buffer is fixed relative to the rotor, and the chuck is movable relative to the rotor in the first direction.
[0020] Optionally, the spindle further includes a fastener, which is sleeved on the outside of the buffer and fixed relative to the rotor.
[0021] Optionally, the housing includes an inner shell and an outer shell, the outer shell being fitted over the outside of the inner shell, and a gap between the inner shell and the outer shell for filling a cooling medium.
[0022] On the other hand, this utility model embodiment provides a PCB processing equipment, characterized in that it includes a machine base and at least one spindle as described above, and a cutting tool is installed on the chuck to process the board material to be processed placed on the machine base.
[0023] The spindle buffer structure provided in this embodiment of the utility model applies an axial force to the workpiece at the moment the cutting tool comes into contact with it. The workpiece generates a reaction force on the cutting tool, which pushes the chuck to move in the direction of the buffer member along the first direction. The impact force is transmitted to the buffer member through the chuck. The buffer member buffers the chuck and the cutting tool, reducing the phenomenon of cutting tool slippage and deviation, so that the cutting tool maintains the drilling path and reduces the deviation of hole position accuracy. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of a spindle provided in an embodiment of the present invention;
[0025] Figure 2 yes Figure 1 Schematic diagram of the cross section along the AA direction;
[0026] Figure 3 yes Figure 2 Enlarged view of point B in the middle;
[0027] Figure 4 This is a schematic diagram of a buffer component provided in one embodiment of the present invention.
[0028] The reference numerals in the accompanying drawings are as follows:
[0029] 10. Spindle;
[0030] 1. Buffer component; 11. Buffer component body; 111. Body; 112. Inner tube; 113. First cavity; 114. Second cavity; 115. First hole; 116. Second hole; 12. Buffer component push rod; 121. Rod body; 122. Piston; 13. Reset component;
[0031] 2. Chuck; 21. First connecting hole; 22. Second connecting hole; 23. Washer;
[0032] 3. Locking components;
[0033] 4. Housing; 41. Inner housing; 42. Outer housing; 43. End cap; 5. Rotor; 6. Stator; 7. Fasteners;
[0034] a. First direction. Detailed Implementation
[0035] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.
[0036] like Figures 1 to 4 As shown, an embodiment of the present invention provides a spindle buffer structure, including a buffer member 1 and a collet 2. The buffer member 1 is adapted to be installed inside the spindle 10, one end of the collet 2 is connected to the buffer member 1, and the other end of the collet 2 is used to install a cutting tool.
[0037] When the cutting tool comes into contact with the plate to be machined, the chuck 2 can move along the first direction a, and the buffer 1 can buffer the chuck 2.
[0038] When the cutting tool comes into contact with the workpiece, it applies an axial force to the workpiece. The workpiece generates a reaction force on the cutting tool. This reaction force can push the chuck 2 to move in the direction of the buffer 1 along the first direction a. The impact force is transmitted to the buffer 1 through the chuck 2. The buffer 1 buffers the chuck 2 and the cutting tool, reducing the phenomenon of cutting tool slippage and deviation, so that the cutting tool maintains the drilling path and reduces the hole position accuracy deviation.
[0039] Upon contact with the plate surface, the cutting tool experiences a reaction force from the plate material. This reaction force acts directly on the cutting edge, causing stress deformation. The longer the cutting edge, the more pronounced the stress change. The buffer 1 can counteract the impact reaction force generated when the cutting tool contacts the plate surface, thereby significantly reducing the force on the cutting edge and minimizing stress concentration, deformation, and tool breakage.
[0040] In order to buffer the cutting tool, the buffer 1 can dynamically absorb the instantaneous impact energy when the cutting tool contacts the workpiece through the viscous resistance of the fluid, with an energy absorption efficiency of ≥75%; or it can generate elastic deformation through the elastic medium to convert the impact kinetic energy into elastic potential energy, and release the elastic potential energy after the impact disappears.
[0041] In one embodiment, such as Figure 2 , Figure 3 As shown, the buffer 1 includes a buffer body 11 and a buffer push rod 12. One end of the buffer push rod 12 is movably connected to the buffer body 11, and the other end of the buffer push rod 12 is connected to the clamp 2. The buffer body 11 and the clamp 2 are connected through the buffer push rod 12.
[0042] When the cutting tool comes into contact with the workpiece, it applies an axial force to the workpiece. This reaction force causes the chuck 2 to move along the first direction a, thereby driving the buffer push rod 12 to move within the buffer body 11. The fluid medium within the buffer body 11 generates resistance to buffer the chuck 2.
[0043] When the buffer push rod 12 moves, it can force the fluid medium to flow through the throttling orifice or a specific gap. The throttling of the fluid medium generates viscous resistance. The damping force of the fluid medium is always opposite to the direction of movement of the buffer push rod 12, which can counteract the reaction force on the chuck 2, thereby slowing down the movement of the tool and absorbing instantaneous impact energy.
[0044] In this embodiment, a fluid medium is used for buffering, with a response time of ≤2ms. This is suitable for the buffering of the chuck 2 of a high-speed (spindle speed ≥150,000 rpm) drilling spindle 10, ensuring its stability under high-speed machining.
[0045] In one embodiment, the fluid medium is hydraulic oil or gas. When hydraulic oil is used, its viscosity causes resistance during the throttling process. This resistance is opposite to the impact force of the tool, thereby slowing down the tool's movement and absorbing impact energy. Using pneumatic pressure as the working medium works on a similar principle to a hydraulic buffer system. When the tool is impacted, it pushes the piston 122 within the pneumatic buffer, causing gas to flow through the throttling device. The gas generates viscous resistance during the throttling process, absorbing the impact energy of the tool.
[0046] As a specific embodiment, such as Figure 4 As shown, buffer 1 is a hydraulic damper or a pneumatic damper. The fluid medium in the hydraulic damper is hydraulic oil, and the fluid medium in the pneumatic damper is gas.
[0047] In one embodiment, such as Figure 4 As shown, the buffer push rod 12 includes a rod body 121 and a piston 122. The piston 122 is slidably connected to the inside of the buffer body 11, and the rod body 121 is connected between the piston 122 and the buffer push rod 12.
[0048] The chuck 2 can push the buffer push rod 12 to move away from the chuck 2 along the first direction a, so that the piston 122 moves inside the buffer body 11. The piston 122 can squeeze the fluid medium to buffer the chuck 2 through the resistance of the fluid medium.
[0049] The fluid medium is filled in the buffer body 11. The outer peripheral surface of the piston 122 abuts against the inner wall surface of the buffer body 11. During the movement of the piston 122, the fluid medium will not overflow from the contact surface between the piston 122 and the buffer body 11. As the buffer push rod 12 gradually moves away from the chuck 2, the piston 122 squeezes the fluid medium (such as hydraulic oil) in the buffer body 11, forcing the fluid medium to flow through the throttling orifice or a specific gap, thereby generating viscous resistance.
[0050] In one embodiment, such as Figure 4 As shown, the buffer 1 also includes a reset member 13, which is disposed within the buffer body 11. The reset member 13 is used to push the buffer push rod 12 to move along the first direction a towards the clamp 2. When the buffer push rod 12 moves away from the clamp 2, the reset member 13 deforms and stores elastic potential energy. After the impact energy is absorbed, the reset member 13 provides a reverse driving force to the buffer push rod 12, causing it to quickly return to its initial position, ensuring that the buffer 1 can continuously withstand the next impact.
[0051] The reset element 13 can be, but is not limited to, a helical spring or a disc spring.
[0052] In one embodiment, such as Figure 4 As shown, the buffer body 11 is provided with a cavity, the fluid medium is disposed in the cavity, and the piston 122 is disposed in the cavity to divide the cavity into a first cavity 113 and a second cavity 114. The first cavity 113 and the second cavity 114 are connected, and the fluid medium can flow in the first cavity 113 and the second cavity 114.
[0053] When piston 122 moves away from chuck 2 along the first direction a, the fluid medium in the first cavity 113 can enter the second cavity 114; when piston 122 moves closer to chuck 2 along the first direction a, the fluid medium in the second cavity 114 can enter the first cavity 113.
[0054] When the chuck 2 and the cutting tool are impacted by a reaction force, the buffer push rod 12 moves away from the chuck 2 along the first direction a, thereby causing the piston 122 to move away from the chuck 2 along the first direction a. As the piston 122 moves, the volume of the first cavity 113 decreases and the volume of the second cavity 114 increases, forcing the fluid medium in the first cavity 113 to flow into the second cavity 114. The fluid medium generates viscous resistance, thus achieving buffering.
[0055] When the reset member 13 pushes the piston 122 to move closer to the chuck 2, the volume of the first cavity 113 increases and the volume of the second cavity 114 decreases, forcing the fluid medium in the second cavity 114 to flow back to the first cavity 113, thereby resetting the buffer push rod 12.
[0056] In one embodiment, such as Figure 4 As shown, the buffer body 11 includes a body 111 and an inner tube 112. The body 111 is sleeved on the outside of the inner tube 112, and there is a gap between the inner wall surface of the body 111 and the outer wall surface of the inner tube 112.
[0057] The inner tube 112 is provided with a first hole 115 and a second hole 116. The first hole 115 communicates with the first cavity 113, and the second hole 116 communicates with the second cavity 114. The first hole 115 communicates with the second hole 116 through the gap between the inner wall surface of the body 111 and the outer wall surface of the inner tube 112. When the buffer push rod 12 is subjected to a reaction force, causing the piston 122 to move away from the chuck 2 along the first direction a, the piston 122 squeezes the fluid medium in the first cavity 113, forcing the fluid medium in the first cavity 113 to pass sequentially through the first hole 115, the gap between the inner wall surface of the body 111 and the outer wall surface of the inner tube 112, and the second hole 116, before entering the second cavity 114.
[0058] After the cutting tool finishes processing, the reset member 13 pushes the piston 122 to move in the first direction a towards the chuck 2. The piston 122 squeezes the fluid medium in the second cavity 114, forcing the fluid medium in the second cavity 114 to pass through the second hole 116, the gap between the inner wall surface of the body 111 and the outer wall surface of the inner tube 112, and the first hole 115 in sequence, and then enter the first cavity 113.
[0059] In other alternative embodiments, a plurality of throttling orifices may be provided on the piston 122, the orifices extending through the piston 122 in a first direction, and the first cavity 113 and the second cavity 114 communicating through the throttling orifices. When the piston 122 compresses the fluid medium, the fluid medium flows between the first cavity 113 and the second cavity 114 through the throttling orifices.
[0060] In one embodiment, such as Figure 2 , Figure 3 As shown, a locking element 3 is provided at one end of the chuck 2 near the buffer 1, and the buffer push rod 12 is connected to the locking element 3 so that the buffer push rod 12 is fixed relative to the chuck 2.
[0061] The locking element 3 enables the connection between the chuck 2 and the buffer push rod 12, transmitting the reaction force of the workpiece on the tool to the buffer element 1, thereby buffering the chuck 2 and the tool.
[0062] Inside the spindle 10, there is a rotor 5 and a stator 6. The buffer 1 is installed on the rotor 5 and can rotate with the rotor 5. Through the locking member 3, the chuck 2 can rotate with the rotor 5 without affecting the movement of the chuck 2 in the first direction a.
[0063] In one embodiment, such as Figure 2 , Figure 3 As shown, the chuck 2 is provided with a first connecting hole 21, which extends along a first direction a. The locking member 3 is disposed in the first connecting hole 21, and the buffer push rod 12 is located in the first connecting hole 21 and passes through the locking member 3. By placing the locking member 3 in the first connecting hole 21, it does not occupy axial space and is suitable for connecting the buffer push rod 12 and the chuck 2 in the narrow space within the spindle 10.
[0064] In a preferred embodiment, the first connecting hole 21 includes a first hole 115 and a second hole 116 that are interconnected. The diameter of the first hole 115 is smaller than the diameter of the second hole 116. A stepped structure is formed at the junction of the first hole 115 and the second hole 116. The locking member 3 is disposed in the first hole 115 and abuts against the stepped structure, thereby defining the installation position of the locking member 3 in the first connecting hole 21.
[0065] In one embodiment, the locking member 3 is a locking nut, and the buffer push rod 12 is threaded, with the buffer push rod 12 threadedly connected to the locking member 3. Alternatively, the locking member 3 is annular, and is tightly fitted in the first connecting hole 21, allowing the buffer push rod 12 to be tightly fitted onto the locking member 3.
[0066] In one embodiment, such as Figure 3 As shown, a washer 23 is provided in the first connecting hole 21, and the washer 23 is sleeved on the outside of the buffer push rod 12.
[0067] When the piston 122 moves rapidly, the plastic deformation of the washer 23 can absorb some of the impact energy, preventing the buffer push rod 12 from having a rigid collision with the chuck 2.
[0068] Among them, washer 23 can be, but is not limited to, a spring washer, a plastic washer, or a stainless steel washer.
[0069] In one embodiment, a second connecting hole 22 is provided at the end of the chuck 2 away from the buffer 1. The second connecting hole 22 extends along the first direction a and is used to insert a cutting tool to realize the installation of the cutting tool.
[0070] The first connecting hole 21 is connected to the second connecting hole 22 and passes through the clamp 2 along the first direction a.
[0071] In another embodiment, the buffer 1 is an elastic buffer, which is used to deform when the chuck 2 moves along the first direction a to buffer the chuck 2. When the tool comes into contact with the workpiece, the reaction force of the workpiece on the chuck 2 can push the chuck 2 to move along the first direction a. The chuck 2 compresses the elastic buffer and deforms, and the impact kinetic energy is converted into elastic potential energy. After the impact disappears, the elastic potential energy is released, pushing the chuck 2 to reset, preparing for the next tool processing.
[0072] The elastic buffer can be, but is not limited to, a spring, rubber, or elastic metal, and can provide cushioning for the chuck 2. The spring buffer 1 has a slightly slower response speed and is suitable for spindles 10 with lower machining frequencies.
[0073] On the other hand, such as Figure 2 As shown, this utility model embodiment provides a spindle 10, including a housing 4, a rotor 5, a stator 6, and the spindle buffer structure described in the above embodiment. The rotor 5 and the stator 6 are disposed inside the housing 4, and the stator 6 is sleeved outside the rotor 5. There is an air gap between the rotor 5 and the stator 6 filled with high-pressure gas.
[0074] The buffer 1 is fixed relative to the rotor 5, and the chuck 2 can move relative to the rotor 5 in the first direction a.
[0075] When energized, a magnetic field is generated, which can drive the rotor 5 to rotate at high speed. Since the buffer 1 is fixed relative to the rotor 5, the buffer 1 rotates synchronously with the rotor 5 and drives the chuck 2 connected to the buffer 1 to rotate together, so that the tool on the chuck 2 can perform drilling on the plate to be processed.
[0076] The rotor 5 is sleeved on the outside of the buffer 1, and one end of the chuck 2 extends into the inside of the rotor 5 and is connected to the buffer 1. The chuck 2 and the rotor 5 are fitted with a clearance, so that the chuck 2 can rotate with the buffer 1 when the buffer 1 and the rotor 5 rotate synchronously, and can also move along the first direction a under the reaction force of the plate to be processed when the tool comes into contact with the plate to be processed.
[0077] When the buffer 1 is a hydraulic damper or a pneumatic damper, the buffer push rod 12 of the buffer 1 is connected to the chuck 2. Through the buffer push rod 12, the chuck 2 is driven to rotate together when the buffer 1 rotates.
[0078] In one embodiment, such as Figure 2 As shown, the size of the stator 6 in the first direction a is smaller than the size of the rotor 5 in the first direction a. There is a gap between the rotor 5 and the housing 4, which is also filled with high-pressure gas. During the rotation of the rotor 5, it plays a lubricating role and reduces the friction between the rotor 5 and the housing 4.
[0079] In one embodiment, such as Figure 2 As shown, the spindle 10 also includes a fastener 7, which is sleeved on the outside of the buffer 1 and fixed relative to the rotor 5. By fixing the buffer 1 with the fastener 7, the buffer 1 can rotate with the rotor 5, thereby driving the chuck 2 and the tool to rotate.
[0080] Among them, the fastener 7 is a dead-point ring, which is ring-shaped and sleeved on the outside of the buffer body 11. The dead-point ring can restrict the position of the buffer 1.
[0081] In one embodiment, such as Figure 2 As shown, the housing 4 includes an inner shell 41 and an outer shell 42. The outer shell 42 is fitted over the inner shell 41, and there is a gap between the inner shell 41 and the outer shell 42 for filling with cooling medium. The stator 6 and rotor 5 inside the housing 4 are the main heat sources, and the heat generated is conducted to the inner shell 41 and the outer shell 42. The cooling medium can cool the housing 4.
[0082] In one embodiment, the housing 4 further includes an end cap 43, which is installed on the outer casing 42 to enclose and form a space for accommodating the stator 6 and the rotor 5. By connecting the end cap 43 to the outer casing 42, the stator 6 and the rotor 5 can be sealed inside the housing 4, so that the stator 6 and the rotor 5 cannot be exposed.
[0083] The end of the chuck 2 away from the buffer 1 is inserted into the end cover 43. The chuck 2 and the end cover 43 are fitted with a clearance, so that the chuck 2 does not interfere with the end cover 43 when it moves in the first direction a.
[0084] Furthermore, this embodiment of the invention provides a PCB processing device, including a machine base and at least one spindle 10 as described in the above embodiment. A cutting tool is mounted on the chuck 2 to process the board material to be processed placed on the machine base. The rotation of the rotor 5 can drive the chuck 2 and the cutting tool to rotate, thereby enabling drilling of the board material to be processed.
[0085] At the instant the cutting tool contacts the workpiece, the workpiece exerts a reaction force on the cutting tool, causing the chuck 2 to move along the first direction a. The buffer 1 provides cushioning, reducing the slippage and deflection of the cutting tool, and ensuring that the cutting tool maintains a vertical drilling path, thereby ensuring the machining accuracy of the hole.
[0086] In one embodiment, the PCB processing equipment is a multi-axis drilling machine, with multiple spindles 10, each spindle driven independently, or at least two spindles 10 fed synchronously, enabling the same board material to be processed.
[0087] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.
Claims
1. A spindle buffer structure, characterized in that, It includes a buffer and a collet; the buffer is adapted to be installed inside the spindle, one end of the collet is connected to the buffer, and the other end of the collet is used to install a cutting tool; When the cutting tool comes into contact with the plate to be processed, the chuck can move along the first direction, and the buffer can cushion the chuck.
2. The spindle buffer structure as described in claim 1, characterized in that, The buffer includes a buffer body and a buffer push rod. One end of the buffer push rod is movably connected to the buffer body, and the other end of the buffer push rod is connected to the clamp. The chuck moves along the first direction, which can drive the buffer push rod to move within the buffer body. The fluid medium within the buffer body generates resistance to buffer the chuck.
3. The spindle buffer structure as described in claim 2, characterized in that, The buffer push rod includes a rod body and a piston. The piston is slidably connected to the interior of the buffer body, and the rod body is connected between the piston and the buffer push rod. The chuck can push the buffer push rod to move away from the chuck along the first direction, and the piston squeezes the fluid medium to buffer the chuck through the resistance of the fluid medium.
4. The spindle buffer structure as described in claim 3, characterized in that, The buffer body is provided with a cavity, and the piston is disposed in the cavity to divide the cavity into a first cavity and a second cavity, the first cavity and the second cavity being in communication; When the piston moves away from the chuck along the first direction, the fluid medium in the first cavity can enter the second cavity; When the piston moves toward the clamp along the first direction, the fluid medium of the second cavity can enter the first cavity.
5. The spindle buffer structure as described in claim 2, characterized in that, The buffer also includes a reset member disposed within the buffer body. The reset member is used to push the buffer push rod to move along the first direction toward the direction of the clamp.
6. The spindle buffer structure as described in claim 2, characterized in that, A locking element is provided at one end of the clamp near the buffer element, and the buffer element push rod is connected to the locking element so that the buffer element push rod is fixed relative to the clamp.
7. The spindle buffer structure as described in claim 6, characterized in that, The clamp is provided with a first connecting hole, the locking member is disposed in the first connecting hole, and the buffer push rod is located in the first connecting hole and passes through the locking member.
8. The spindle buffer structure as described in claim 1, characterized in that, The chuck is provided with a second connecting hole at the end away from the buffer, and the second connecting hole is used to insert the cutting tool.
9. The spindle buffer structure as described in claim 1, characterized in that, The buffer is an elastic buffer, which is used to deform when the chuck moves along the first direction to buffer the chuck.
10. A spindle, characterized in that, The device includes a housing, a rotor, a stator, and a spindle buffer structure as described in any one of claims 1-9. The rotor and the stator are disposed within the housing, the stator is sleeved on the outside of the rotor, the buffer is fixed relative to the rotor, and the chuck is movable relative to the rotor in the first direction.
11. The spindle as claimed in claim 10, characterized in that, The main shaft also includes fasteners, which are sleeved on the outside of the buffer and fixed relative to the rotor.
12. The spindle as claimed in claim 10, characterized in that, The housing includes an inner shell and an outer shell, the outer shell being fitted over the outside of the inner shell, and a gap between the inner shell and the outer shell for filling with a cooling medium.
13. A PCB processing equipment, characterized in that, The machine includes a machine base and at least one spindle as described in any one of claims 10-12, wherein a cutting tool is mounted on the chuck for processing the sheet metal to be processed placed on the machine base.