Quantitative control grinding device and method for end face of carbon fiber rod piece

Abstract

The invention discloses a quantitative control grinding device and method for the end face of a carbon fiber rod piece, and relates to the technical field of carbon fiber material surface treatment devices. The device comprises an operation platform, an adjustable support, a magnetic switch type precise V-shaped block module, a carbon fiber rod piece, a dust collection module, an electric appliance control module, a forward and reverse rotation adjustable-speed motor module, a servo motor module and a touch screen control operation panel module. The operation platform provides supporting and fixing effects, the upper surface of the adjustable support is used for fixing the magnetic switch type precise V-shaped block module, the magnetic switch type precise V-shaped block module is used for clamping a carbon fiber rod piece, the dust suction module is used for sucking and removing generated dust, and the electric appliance control module is based on PLC program control. And an electric cabinet and a touch screen operation interface are arranged, so that the polishing operation is quantitatively controlled. The problems that existing manual polishing of the end face of the carbon fiber rod piece is low in precision and efficiency, dust pollution is caused, and consistency is poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber rod grinding devices, and specifically to a quantitative control grinding device and method for the end faces of carbon fiber rods. Background Technique

[0002] The satellite composite truss structure is assembled by gluing carbon fiber multi-way joints and carbon fiber rods. The truss structure is light in weight, large in load-bearing, high in dimensional stability, and strong in designability, and is very suitable as a support structure for large satellite payloads. The satellite composite truss structure is mainly glued by high-strength adhesives for parts such as rods, joints, patches, and corner boxes. Its gluing process is very complex and involves multiple gluing processes of various parts, such as rod-joint gluing, patch gluing, and gluing defect repair. To ensure the gluing strength of the truss, it is necessary to grind and file the truss rods and multi-way joints during the pre-assembly stage.

[0003] Currently, the end faces of the rods are mainly ground manually with sandpaper, and the grinding accuracy is low: In the existing grinding methods, whether manual or partial simple mechanical grinding, it is difficult to accurately control the grinding amount, resulting in insufficient accuracy of the end faces of the ground rods, causing situations such as out-of-tolerance flatness and unqualified roughness, which in turn affect the subsequent gluing or assembly quality. Low efficiency: Manual grinding has a large labor intensity and low efficiency. Traditional mechanical grinding equipment has poor adaptability when processing carbon fiber rods of different sizes and shapes, and it takes a long time to frequently adjust the equipment parameters and clamping methods. Serious dust pollution: A large amount of dust is generated during the grinding of carbon fiber composites. Most of the existing grinding equipment lacks effective dust control measures, which endangers the health of operators and may also affect the normal operation of the equipment and the safety of the surrounding environment. Unstable clamping: During the grinding process, unstable clamping of the rod will lead to uneven grinding and affect the product quality. The existing clamping devices are difficult to ensure an efficient and symmetric clamping effect on carbon fiber rods.

[0004] The traditional manual operation method has become a bottleneck problem restricting the improvement of the development efficiency of satellite truss gluing. It is urgent to introduce new devices and new methods during the assembly process. For this reason, we provide a quantitative control grinding device and method for the end faces of carbon fiber rods. Summary of the Invention

[0005] The purpose of the present invention is to provide a quantitative control grinding device and method for the end faces of carbon fiber rods to solve the problems raised in the above background technique.

[0006] The present invention is implemented as follows: The present invention discloses a device and method for quantitatively controlling the grinding of the end face of a carbon fiber rod. The device is characterized in that it includes: an operation platform, adjustable supports, a magnetic switch type precision V-block module, a carbon fiber rod, a dust suction module, an electrical control module, a forward and reverse adjustable speed motor module, a servo motor module, and a touch screen control operation panel module. The upper end face of the operation platform is provided with threaded connection interfaces for fixing the adjustable supports, the dust suction module, the electrical control module, the servo motor module, and the touch screen control operation panel module. The adjustable supports are made of cast iron and are used to fix the magnetic switch type precision V-block module. The magnetic switch type precision V-block module is used to fix and clamp the carbon fiber rod. The dust suction module is used to suck the dust generated during the grinding of the carbon fiber rod. The electrical control module is based on a PLC program control and is equipped with an electrical cabinet and a touch screen control operation panel module to realize the quantitative control of the grinding operation.

[0007] Preferably, in the device for quantitatively controlling the grinding of the end face of a carbon fiber rod, the adjustable support includes a support platform for placing and fixing the magnetic switch type precision V-block module, and a height adjustment knob for adjusting the height so that the carbon fiber rod is positioned at the center of the detachable grinding disc.

[0008] Preferably, in the device for quantitatively controlling the grinding of the end face of a carbon fiber rod, the magnetic switch type precision V-block includes a threaded interface on the V-block, a 90° lower mating surface of the V-block, a magnetic switch, a permanent magnet base and a screw cap, a mating thread, a spherical universal joint, and a 90° upper mating surface of the V-block, and is used for clamping the carbon fiber rod.

[0009] Preferably, in the device for quantitatively controlling the grinding of the end face of a carbon fiber rod, the dust suction module includes a dust suction pipe, a filtering device, a dust suction port, a compression blower, a lifting guide rail, a detachable dust collection pipe, and a lifting motor, and is used to suck the dust generated during the grinding of the carbon fiber rod.

[0010] Preferably, in the device for quantitatively controlling the grinding of the end face of a carbon fiber rod, the electrical control module includes a circuit breaker, an air switch, a PLC controller, a terminal block, a frequency converter, a contactor, a servo driver, a DC power supply, a controller, and an encoder, and is used to control the dust suction module and the servo motor module.

[0011] Preferably, in the device for quantitatively controlling the grinding of the end face of a carbon fiber rod, the forward and reverse adjustable speed motor module includes a detachable grinding disc, a drill chuck, a coupling, and a grinding drive motor, and realizes the quantitative control grinding of the end face of the carbon fiber rod.

[0012] Preferably, the carbon fiber rod end face quantitative control grinding device is characterized in that the servo motor module includes a lead screw guide rail, a front position sensor, a ball screw, a lead screw slide, a transmission seat, a rear position sensor, and a servo motor, realizing the motion control of the forward and reverse adjustable speed motor module.

[0013] Preferably, the carbon fiber rod end face quantitative control grinding device is characterized in that the touch screen control operation panel module includes a power switch, a start button, a test button, a stop button, a left pressure gauge, a reset button, a left pressure regulating valve, a pause button, an emergency stop button, a forward speed regulator, a reverse speed regulator, a left pressure regulating valve, a right pressure gauge, and a touch screen. The operator can set parameters, view the equipment operation status, and perform operation control.

[0014] Preferably, a carbon fiber rod end face quantitative control grinding device and method are characterized in that the method includes the following steps: Step 1: Power on the system and perform a self-check when starting up, so that the dust collection module, the electrical control module, and the touch screen control operation panel module are normally started. After starting the device, the control system automatically performs a self-check program when starting up. Check whether the front position sensor and the rear position sensor are working properly, whether devices such as the servo motor and the compression blower can be normally started, and whether the touch screen operation interface is normally displayed. If a fault is found, the fault information is displayed on the touch screen and the operator is prompted to perform corresponding repairs.

[0015] Step 2: Parameter setting. On the touch screen operation interface, set working parameters such as the grinding amount, the servo motor speed, the compression blower pressure value, the movement path, and the grinding stay time.

[0016] Step 3: Clamp the rod. Place the carbon fiber rod to be ground on the magnetic switch type precision V-block and make contact with the 90° lower fitting surface of the V-block. The end face of the carbon fiber rod contacts the detachable grinding disc, and then tighten the screw cap. Through the cooperation of the thread and the spherical universal joint, the 90° upper fitting surface of the V-block is matched with the carbon fiber rod, so as to realize the stable clamping of the carbon fiber rod.

[0017] Step 4: Start grinding. Start the grinding drive motor, press the forward speed regulator, and the coupling drives the drill chuck to move, so that the detachable grinding disc rotates at a set speed. On the touch screen control operation panel module, press the start button to start the servo motor and the compression blower. The servo motor drives the ball screw to move according to the preset speed and path, and then drives the lead screw slide to move in the lead screw guide rail.

[0018] Step 5: Grinding and dust suction. During the grinding process, the detachable grinding disc gradually approaches the end face of the rod and starts grinding according to the set grinding path. After the compression blower is started, a negative pressure is formed in the grinding area, and the generated dust is sucked into the detachable dust collection pipeline. At the same time, the dust concentration sensor monitors the dust concentration in the grinding area, thereby adjusting the rotation speed of the compression blower.

[0019] Step 6: End of grinding. Press the stop button, and the servo motor, the grinding drive motor, and the compression blower stop running. Loosen the screw cap and take out the carbon fiber rod.

[0020] In the above technical solution, a quantitative control grinding device for the end face of a carbon fiber rod provided by the present invention and 1. The invention realizes the efficient and rapid clamping and positioning of the carbon fiber rod. Through the combined action of the magnetic switch type precision V-block and the clamping device, the problem of unstable hand-held fixation of the existing carbon fiber rod is overcome, and the efficiency of rapid clamping of the carbon fiber rod is improved.

[0021] 2. The invention realizes the control of quantitative automatic grinding of the end face of the carbon fiber rod. Through the servo motor, the ball screw, and the electrical program control, the limitation of difficult control of the manual grinding amount of the carbon fiber rod is solved, and the consistency and efficiency of grinding the carbon fiber rod are improved.

[0022] 3. The invention realizes the effective protection of the carbon fiber dust generated during the grinding of the end face of the carbon fiber rod. After the compression blower is started, a negative pressure is formed in the grinding area, and the generated dust is sucked into the detachable dust collection pipeline, reducing the risk that the dust generated during the grinding of the carbon fiber rod harms the operator. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the present invention application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0024] Figure 1 It is a schematic structural diagram of a quantitative control grinding device for the end face of a carbon fiber rod provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of an adjustable support provided by an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a magnetic switch type precision V-block provided by an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a dust suction module provided by an embodiment of the present invention; Figure 5 It is a schematic structural diagram of an electrical control module provided by an embodiment of the present invention; Figure 6 Schematic diagram of the forward and reverse adjustable speed motor module provided by the embodiment of the present invention; Figure 7 Schematic diagram of the servo motor module provided by the embodiment of the present invention; Figure 8 Schematic diagram of the touch screen control operation panel module provided by the embodiment of the present invention; Figure 9 Schematic diagram of the V-block clamping screw provided by the embodiment of the present invention.

[0025] Among them, 1. Operating platform; 2. Adjustable support; 3. Magnetic switch type precision V-block module; 4. Carbon fiber rod; 5. Dust suction module; 6. Electrical control module; 7. Forward and reverse adjustable speed motor module; 8. Servo motor module; 9. Touch screen control operation panel module; 10. Support platform; 11. Height adjustment knob; 12. Threaded interface on the V-block; 13. 90° lower fitting surface of the V-block; 14. Magnetic switch; 15. Permanent magnet base; 16. Dust suction pipe; 17. Filter device; 18. Dust suction port; 19. Compression blower; 20. Lifting guide rail; 21. Detachable dust collection pipe; 22. Lifting motor; 23. Circuit breaker; 24. Air switch; 25. PLC controller; 26. Terminal block; 27. Frequency converter; 28. Contactor; 29. Servo driver; 30. DC power supply; 31. Controller; 32. Encoder; 33. Detachable grinding disc; 34. Drill chuck; 35. Coupling; 36. Grinding drive motor; 37. Lead screw guide rail; 38. Front position sensor; 39. Ball screw; 40. Lead screw slide; 41. Transmission seat; 42. Rear position sensor; 43. Servo motor; 44. Power switch; 45. Start button; 46. Test button; 47. Stop button; 48. Left pressure gauge; 49. Reset button; 50. Left pressure regulating valve; 51. Pause button; 52. Emergency stop button; 53. Forward speed regulator; 54. Reverse speed regulator; 55. Left pressure regulating valve; 56. Right pressure gauge; 57. Touch screen; 58. Screw cap; 59. Matching thread; 60. Spherical universal joint; 61. 90° upper fitting surface of the V-block. Detailed implementation manners

[0026] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The content mentioned in the implementation manners does not limit the present invention.

[0027] Such as Figures 1-9As shown in the figure, an embodiment provided by the present invention is a quantitative control grinding device and method for the end face of a carbon fiber rod. The device is characterized in that it includes: an operation platform 1, an adjustable support 2, a magnetic switch type precision V-block module 3, a carbon fiber rod 4, a dust suction module 5, an electrical control module 6, a forward and reverse adjustable speed motor module 7, a servo motor module 8, and a touch screen control operation panel module 9. The upper end face of the operation platform 1 is provided with threaded connection interfaces for fixing the adjustable support 2, the dust suction module 5, the electrical control module 6, the servo motor module 8, and the touch screen control operation panel module 9. The adjustable support 2 is made of cast iron and is used to fix the magnetic switch type precision V-block module 3. The magnetic switch type precision V-block module 3 is used to fix and clamp the carbon fiber rod 4. The dust suction module 5 is used to suck the dust generated by grinding the carbon fiber rod 4. The electrical control module 6 is based on PLC program control and is equipped with an electric cabinet and a touch screen control operation panel module 9 to realize quantitative control of the grinding operation.

[0028] As Figure 2 shown, the adjustable support 2 includes a support platform 10 for placing and fixing the magnetic switch type precision V-block module 3, and a height adjustment knob 11 for adjusting the height so that the carbon fiber rod 4 is placed at the center of the detachable grinding disc 33.

[0029] As Figure 3 shown, the magnetic switch type precision V-block 3 includes a V-block upper threaded interface 12, a V-block 90° lower fitting surface 13, a magnetic switch 14, a permanent magnet base 15, and a screw cap 58, a mating thread 59, a spherical universal joint 60, and a V-block 90° upper fitting surface 61, which are used for clamping the carbon fiber rod 4.

[0030] As Figure 4 shown, the dust suction module 5 includes a dust suction pipe 16, a filtering device 17, a dust suction port 18, a compression blower 19, a lifting guide rail 20, a detachable dust collection pipe 21, and a lifting motor 22, which are used to suck the dust generated by grinding the carbon fiber rod 4.

[0031] As Figure 5 shown, the electrical control module 6 includes a circuit breaker 23, an air switch 24, a PLC controller 25, a terminal block 26, a frequency converter 27, a contactor 28, a servo driver 29, a DC power supply 30, a controller 31, and an encoder 32, which are used to control the dust suction module 5 and the servo motor module 8.

[0032] As Figure 6 shown, the forward and reverse adjustable speed motor module 7 includes a detachable grinding disc 33, a drill chuck 34, a coupling 35, and a grinding drive motor 36 to realize quantitative control grinding of the end face of the carbon fiber rod 4.

[0033] As Figure 7As shown in the figure, the servo motor module 8 includes a lead screw guide 37, a front position sensor 38, a ball screw 39, a lead screw slide 40, a transmission seat 41, a rear position sensor 42, and a servo motor 43, which realizes the motion control of the forward and reverse adjustable speed motor module 7.

[0034] As Figure 8 shown in the figure, the touch screen control operation panel module 9 includes a power switch 44, a start button 45, a test button 46, a stop button 47, a left pressure gauge 48, a reset button 49, a left pressure regulating valve 50, a pause button 51, an emergency stop button 52, a forward speed regulator 53, a reverse speed regulator 54, a left pressure regulating valve (55), a right pressure gauge 56, and a touch screen 57. The operator can set parameters, view the operating status of the equipment, and perform operation control.

[0035] As Figures 1-9 shown in the figure, a carbon fiber rod end face quantitative control grinding device and method, the method is characterized in that it includes the following steps: Step 1: Power on the system and perform a power-on self-check to enable the dust collection module 5, the electrical control module 6, and the touch screen control operation panel module 9 to start normally. After starting the device, the control system automatically performs a power-on self-check program. Check whether the front position sensor 38 and the rear position sensor 42 are working properly, whether devices such as the servo motor 43 and the compression blower 19 can start normally, and whether the operation interface of the touch screen 57 is displayed normally. If a fault is found, the fault information is displayed on the touch screen 57 and the operator is prompted to perform corresponding repairs.

[0036] Step 2: Parameter setting. On the operation interface of the touch screen 57, set working parameters such as the grinding amount, the rotational speed of the servo motor, the pressure value of the compression blower, the movement path, and the grinding stay time.

[0037] Step 3: Clamp the rod. Place the carbon fiber rod 4 to be ground on the magnetic switch type precision V-block 3 and make it contact with the 90° lower fitting surface 13 of the V-block. The end face of the carbon fiber rod 4 contacts the detachable grinding disc 33, and then tighten the screw cap 58. Through the cooperation thread 59 and the spherical universal joint 60, the 90° upper fitting surface 61 of the V-block is matched with the carbon fiber rod 4, so as to realize the stable clamping of the carbon fiber rod 4.

[0038] Step 4: Start grinding. Start the grinding drive motor 36, press the forward speed regulator 53, the coupling 35 drives the drill chuck 34 to move, and then the detachable grinding disc 33 rotates at a set speed. On the touch screen control operation panel module 9, press the start button 45 to start the servo motor 43 and the compression blower 19. The servo motor 43 drives the ball screw 39 to move according to the preset speed and path, and then drives the lead screw slide 40 to move in the lead screw guide 37.

[0039] Step Five: Grinding and dust suction. During the grinding process, the detachable grinding disc 33 gradually approaches the end face of the rod and starts grinding according to the set grinding path. After the compression blower 19 is started, a negative pressure is formed in the grinding area to suck the generated dust into the detachable dust collection pipe 21. At the same time, the dust concentration sensor monitors the dust concentration in the grinding area to adjust the rotation speed of the compression blower 19.

[0040] Step Six: After grinding is completed, press the stop button 47, and the servo motor 43, the grinding drive motor 36, and the compression blower 19 stop running. Loosen the screw cap 58 and take out the carbon fiber rod 4.

[0041] Only some exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A carbon fiber rod end surface quantitative control grinding device, characterized in that: The device comprises an operating platform (1), on which an adjustable support (2), a magnetic switch type precision V-block module (3), a carbon fiber rod (4), a dust collection module (5), an electrical control module (6), a forward and reverse adjustable speed motor module (7), a servo motor module (8), and a touch screen control operation panel module (9) are arranged; The upper end surface of the operating platform (1) is provided with a threaded connection interface for fixing the adjustable support (2), the dust collection module (5), the electrical control module (6), the servo motor module (8), and the touch screen control operation panel module (9); The adjustable support (2) is used to fix the magnetic switch type precision V-block module (3), the magnetic switch type precision V-block module (3) is used to clamp and fix the carbon fiber rod (4), the dust suction module (5) is used to remove dust generated by grinding the carbon fiber rod (4), and the electrical control module (6) is based on PLC program control and is equipped with an electrical cabinet and a touch screen control operation panel module (9) to achieve quantitative control of the grinding operation.

2. A carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The adjustable support (2) further comprises a support platform (10) and a height adjustment knob (11) under the support platform (10); the support platform (10) is used to place and fix the magnetic switch type precision V-block module (3); and the height of the carbon fiber rod (4) is adjusted by the height adjustment knob (11) to be placed at the center of the detachable grinding disc (33).

3. A carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The magnetic switch type precision V-block (3) comprises a V-block upper threaded interface (12), a V-block 90° lower fitting surface (13), a magnetic switch (14), a permanent magnet base (15) and a screw cap (58), a matching thread (59), a spherical universal joint (60), and a V-block 90° upper fitting surface (61). The magnetic switch type precision V-block (3) is used to clamp a carbon fiber rod (4).

4. The carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The dust collection module (5) comprises a detachable dust collection pipe (21), a dust collection pipe (16), a filter device (17), a dust collection port (18) connected in sequence, and a lifting guide rail (20) connected to the detachable dust collection pipe (21), a lifting motor (22), and a compression fan (19); the dust collection module (5) is used to remove dust generated by polishing the carbon fiber rod (4).

5. The carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The electrical control module (6) comprises a circuit breaker (23), an air switch (24), a PLC controller (25), a terminal block (26), a frequency converter (27), a contactor (28), a servo driver (29), a DC power supply (30), a controller (31), and an encoder (32); the electrical control module (6) is used to control the dust collection module (5) and the servo motor module (8).

6. The carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The forward and reverse adjustable speed motor module (7) comprises a detachable grinding disc (33), a drill chuck (34), a coupling (35), and a grinding drive motor (36) which are connected in sequence; quantitative controlled grinding of the end face of the carbon fiber rod (4) is achieved through the forward and reverse adjustable speed motor module (7).

7. The carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The servo motor module (8) comprises a screw guide rail (37), a front position sensor (38), a ball screw (39), a screw slide (40), a transmission seat (41), a rear position sensor (42), and a servo motor (43). The motion control of the forward and reverse speed-adjustable motor module (7) is achieved through the servo motor module (8).

8. The carbon fiber rod end surface quantitative control grinding device according to claim 1, characterized in that: The touch screen control operation panel module (9) comprises a power switch (44), a start button (45), a test button (46), a stop button (47), a left pressure gauge (48), a reset button (49), a left pressure regulating valve (50), a pause button (51), an emergency stop button (52), a forward speed regulator (53), a reverse speed regulator (54), a left pressure regulating valve (55), a right pressure gauge (56), and a touch screen (57), so that an operator can set parameters, view the operating status of the equipment, and perform operation control.

9. A method for quantitatively controlling the polishing of the end surface of a carbon fiber rod, the method being characterized by: The following steps are involved: Step 1: Power on the system and perform a self-check so that the dust collection module (5), the electrical control module (6), and the touch screen control operation panel module (9) start normally. After starting the device, the control system automatically performs a self-check procedure; checks whether the front position sensor (38), the rear position sensor (42) are working normally, the servo motor (43), and the compressor fan (19); whether the device can start normally, and whether the touch screen (57) operation interface is displayed normally; If a fault is found, the fault information is displayed on the touch screen (57) and the operator is prompted to perform corresponding maintenance; Step 2: parameter setting, on the touch screen (57) operation interface, set the grinding amount, servo motor speed, compression fan pressure value, motion path, grinding dwell time and other working parameters; Step 3: Clamp the rod. Place the carbon fiber rod (4) to be polished on the magnetic switch type precision V-block (3) and contact it with the 90° lower fitting surface (13) of the V-block. The end surface of the carbon fiber rod (4) contacts the detachable polishing disc (33). Then tighten the screw cap (58). Through the matching thread (59) and the ball universal joint (60), the 90° upper fitting surface (61) of the V-block is matched with the carbon fiber rod (4), thereby achieving stable clamping of the carbon fiber rod (4). Step 4: Grinding begins, the grinding drive motor (36) is started, the forward speed regulator (53) is pressed, the coupling (35) drives the drill chuck (34) to move, and the detachable grinding disc (33) rotates at a set speed; on the touch screen control operation panel module (9), the start button (45) is pressed to start the servo motor (43) and the compressor fan (19); the servo motor (43) drives the ball screw (39) to move at a preset speed and path, and drives the screw slide (40) to move in the screw guide rail (37); Step 5: Grinding and dust collection. During the grinding process, the detachable grinding disc (33) is gradually brought close to the end face of the rod member and grinding is started according to a set grinding path. After the compression fan (19) is started, negative pressure is formed in the grinding area, and the generated dust is sucked into the detachable dust collection duct (21). At the same time, the dust concentration sensor monitors the dust concentration in the grinding area, thereby adjusting the rotation speed of the compression fan (19); Step 6: After the grinding is finished, the stop button (47) is pressed, the servo motor (43), the grinding drive motor (36) and the compressor fan (19) stop running, the cap (58) is loosened, and the carbon fiber rod (4) is taken out.

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