Vent hole drilling device for processing heat dissipation integrated substrate of circuit board

By designing a circuit board drilling device with belt transmission and threaded transmission structures, the problem that traditional drilling rigs cannot drill multiple sets of circuit boards at the same time and requires manual angle adjustment, achieving an efficient and safe automated drilling process.

CN222844304UActive Publication Date: 2025-05-09DONGGUAN KANGNA ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202421836511.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2025-05-09
Estimated Expiration
2034-07-31

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  • Figure CN222844304U_ABST
    Figure CN222844304U_ABST
Patent Text Reader

Abstract

The utility model relates to the field of substrate drilling devices, in particular to a vent hole drilling device for processing a heat dissipation integrated substrate of a circuit board, and adopts the technical scheme that the vent hole drilling device for processing the heat dissipation integrated substrate of the circuit board comprises a workbench, supporting legs, a surrounding plate, a bracket, a hydraulic cylinder, a drilling machine, a rotating assembly, an adjusting assembly and a fixing assembly, through cooperative work of the rotating assembly, the adjusting assembly and the fixing assembly, the circuit board can rotate automatically, so that the tedious process of manual adjustment of workers is avoided, the horizontal position of the drilling machine can be adjusted to meet various drilling requirements of the circuit board, and the drilling efficiency of the circuit board is improved. The fixing assembly ensures that the circuit boards are kept stable in the drilling process, any movement is avoided, the driving wheel and the driven wheel are connected through a belt, synchronous rotation of the first rotating shaft and the second rotating shaft is achieved, it is ensured that the two rotating discs can rotate at the same rotating speed and rotating direction, and therefore angle adjustment can be conducted on the two circuit boards.
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Description

Technical Field

[0001] The utility model relates to the field of substrate drilling devices, in particular to a ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate. Background Art

[0002] The circuit board is the core component of electronic equipment. It integrates electrical connection, signal transmission, power management, mechanical support and protection, heat dissipation and anti-interference functions. Through precise design and layout, it closely connects various electronic components to achieve efficient and stable operation of the equipment. It is widely used in communications, computers, home appliances, industrial control and automotive electronics.

[0003] In the production process of circuit boards, it is necessary to drill holes in the circuit boards. However, traditional drilling rigs are limited by their method of processing single holes one by one, resulting in low overall processing efficiency, extending the processing cycle and reducing production efficiency. In addition, manual adjustment is required when adjusting the angle of the circuit board, which can easily cause injuries to operators at work and has low safety performance.

[0004] Therefore, in view of the fact that the above-mentioned traditional drilling rigs cannot drill multiple sets of circuit boards at the same time, and manual adjustment is required when adjusting the angle of the circuit boards, a vent hole drilling device for processing a circuit board heat dissipation integrated substrate can be designed. Through a belt drive structure and a threaded drive structure, when drilling two circuit boards at the same time, it is convenient to automatically adjust their angles, thereby meeting different drilling needs. Utility Model Content

[0005] In order to overcome the problem that traditional drilling rigs cannot drill multiple sets of circuit boards at the same time, and that manual adjustments are required when adjusting the angle of the circuit boards.

[0006] The technical solution of the utility model is: a ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate, comprising a workbench, legs, a panel, a bracket, a hydraulic cylinder, a drilling machine, a rotating component, an adjusting component and a fixing component; the lower end of the workbench is fixedly connected with four legs by fastening bolts, the upper end of the workbench is fixedly connected with the panel, the rear end of the workbench is fixedly connected with the bracket, the upper end of the bracket is installed with a hydraulic cylinder, there are two drilling machines and they are composed of a drill rod and a driving structure, the two drilling machines are respectively symmetrically installed in the crossbeam in the adjusting component, the rotating component is installed at the lower end of the workbench and a belt transmission structure is arranged in the rotating component, the adjusting component is connected with the power output element of the hydraulic cylinder and a threaded transmission structure is arranged in the adjusting component, and the fixing component is installed at the upper end of the turntable in the rotating component.

[0007] Preferably, the workbench serves as the basic support platform of the entire drilling device, the legs support the workbench to maintain the overall stability of the device, the enclosure prevents debris generated during the drilling process from splashing, and forms a protective barrier. The hydraulic cylinder generates thrust or pull through the pressure change of the hydraulic oil to achieve motion control of the drilling machine. The drilling machine performs the drilling operation, processes air holes on the integrated heat dissipation substrate of the circuit board, and achieves drilling by driving the drill rod to rotate. The rotating assembly provides rotational motion so that the turntable can drive the fixed assembly and the circuit board to be drilled to rotate to achieve multi-angle drilling effects. The adjusting assembly adjusts the position of the drilling machine to adapt to the processing requirements of circuit boards of different sizes and shapes. The forward and backward movement of the beam is achieved through threaded transmission to adjust the position of the drilling machine. The fixed assembly fixes the circuit board to be processed to prevent movement during the drilling process.

[0008] Preferably, the rotating assembly includes a support, a servo motor and a No. 1 rotating support seat; the support is installed on the ground and located at the lower end of the workbench, a servo motor is installed on the left side of the upper end of the support, and a No. 1 rotating support seat is installed on the right side of the upper end of the support. The support serves as the basic supporting structure of the rotating assembly, providing stable support for the servo motor and the No. 1 rotating support seat. The servo motor provides rotational power, and achieves smooth rotation of the turntable by precisely controlling the speed and direction of the motor to meet different drilling requirements. The No. 1 rotating support seat supports and fixes the No. 2 rotating shaft to ensure its stability during rotation, and a bearing is designed inside it to reduce the friction of the No. 2 rotating shaft during rotation.

[0009] Preferably, the rotating assembly further comprises a coupling, a No. 1 rotating shaft, a No. 2 rotating shaft and a turntable; a coupling is installed at the lower end of the No. 1 rotating shaft and is connected to the output shaft of the servo motor through the coupling; the lower end of the No. 2 rotating shaft is rotatably connected to the No. 1 rotating support seat; the upper ends of the No. 1 rotating shaft and the No. 2 rotating shaft are fixedly connected to the turntable; the coupling connects the output shaft of the servo motor and the No. 1 rotating shaft to transmit the rotational power of the motor; the No. 1 rotating shaft and the No. 2 rotating shaft serve as transmission parts of the rotating assembly, and transmit the rotational power of the servo motor to the turntable to realize rotational motion; the turntable carries and fixes the circuit board to be processed, and rotates with the rotating shaft to facilitate drilling operations at multiple angles.

[0010] Preferably, the rotating assembly also includes a driving wheel, a driven wheel and a belt; the driving wheel is fixedly connected to the upper outer wall of the No. 1 rotating shaft, the driven wheel is fixedly connected to the upper outer wall of the No. 2 rotating shaft, the driving wheel and the driven wheel rotate together and are connected by a belt, the driving wheel and the driven wheel are connected by the belt to achieve synchronous rotation of the No. 1 rotating shaft and the No. 2 rotating shaft, ensuring that the two turntables can rotate at the same speed and direction, and the belt drive has the advantages of smooth transmission, low noise and high transmission efficiency.

[0011] Preferably, the adjustment component includes a longitudinal beam, a No. 2 rotating support seat and a rotating motor; the lower end of the longitudinal beam is connected to the power output element of the hydraulic cylinder, a U-shaped groove is opened at the lower end of the longitudinal beam, the rotating motor is installed at the front end of the longitudinal beam, and the No. 2 rotating support seat is installed on the rear end inner wall of the U-shaped groove. The longitudinal beam serves as the main supporting structure of the adjustment component, and the lower end is connected to the power output element of the hydraulic cylinder, and can move up and down according to the extension and contraction of the hydraulic cylinder. The No. 2 rotating support seat supports and fixes the rear end of the threaded rod so that it can rotate under the drive of the rotating motor. The rotating motor provides rotational power to drive the threaded rod to rotate, and then drives the crossbeam to adjust the front and rear position through the threaded connection.

[0012] Preferably, the adjustment assembly also includes a threaded rod and a crossbeam; the front end of the threaded rod is fixedly connected to the output shaft of the rotary motor, the rear end of the threaded rod is rotatably connected to the No. 2 rotary support seat, and an internal thread that matches the external thread of the threaded rod is provided in the crossbeam. The threaded rod is threadedly connected in the crossbeam. The threaded rod serves as a transmission component. When the rotary motor drives the threaded rod to rotate, due to the interaction of the threads, the crossbeam will move horizontally along the threaded rod. The crossbeam carries and fixes the drilling machine, and the drilling position is adjusted through horizontal movement.

[0013] Preferably, the fixing assembly includes a support plate, an adjusting screw, a knob and a pressure block; the support plate is L-shaped and fixedly connected to the upper end of the turntable, a screw hole is provided in the support plate, the adjusting screw is adapted to the screw hole and is threadedly connected to the screw hole, the upper end of the adjusting screw is integrally fixedly connected with the knob, and the lower end of the adjusting screw is fixedly connected with the pressure block, the support plate serves as the basic supporting structure of the fixing assembly, the support plate has screw holes provided inside, these screw holes are used to install and fix the adjusting screw, the adjusting screw can achieve fine adjustment of height through rotational motion, thereby controlling the degree of compression of the pressure block on the circuit board, the design of the knob facilitates the user to operate the adjusting screw by rotation, and the pressure block is used to compress the circuit board substrate to ensure that it does not move during the drilling process.

[0014] Beneficial effects of the utility model:

[0015] 1. Through the coordinated work of the rotating component, the adjusting component and the fixing component, the circuit board can not only realize automatic rotation, thus avoiding the tedious process of manual adjustment by workers, but also the horizontal position of the drilling machine can be adjusted to meet the various drilling requirements of the circuit board, while the fixing component ensures that the circuit board remains stable during the drilling process to avoid any movement;

[0016] 2. The driving wheel and the driven wheel are connected by a belt to achieve synchronous rotation of the No. 1 and No. 2 rotating shafts, ensuring that the two turntables can rotate at the same speed and direction, so that the angles of the two circuit boards can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1The three-dimensional structure diagram of the ventilation hole drilling device for processing the circuit board heat dissipation integrated substrate of the utility model is shown;

[0018] Figure 2 Shown is a front view schematic diagram of a vent hole drilling device for processing a circuit board heat dissipation integrated substrate of the utility model;

[0019] Figure 3 Shown is a top view schematic diagram of a vent hole drilling device for processing a circuit board heat dissipation integrated substrate of the utility model;

[0020] Figure 4 Shown is a three-dimensional structural schematic diagram of a rotating assembly of a vent hole drilling device for processing a circuit board heat dissipation integrated substrate of the utility model;

[0021] Figure 5 Shown is a three-dimensional structural schematic diagram of an adjustment component of a vent hole drilling device for processing a circuit board heat dissipation integrated substrate of the utility model;

[0022] Figure 6 Shown is a three-dimensional structural schematic diagram of a vent hole drilling device fixing component for processing a circuit board heat dissipation integrated substrate of the utility model.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. workbench; 2. support leg; 3. enclosure; 4. bracket; 5. hydraulic cylinder; 6. drilling machine; 701. support; 702. servo motor; 703. rotating support seat No. 1; 704. coupling; 705. rotating shaft No. 1; 706. rotating shaft No. 2; 707. turntable; 708. driving wheel; 709. driven wheel; 710. belt; 801. longitudinal beam; 802. rotating support seat No. 2; 803. rotating motor; 804. threaded rod; 805. cross beam; 901. support plate; 902. adjusting screw; 903. knob; 904. pressure block. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-Figure 3The utility model provides an embodiment: a ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate, comprising a workbench 1, legs 2, a panel 3, a bracket 4, a hydraulic cylinder 5, a drilling machine 6, a rotating assembly, an adjusting assembly and a fixing assembly; the lower end of the workbench 1 is fixedly connected with four legs 2 by fastening bolts, the upper end of the workbench 1 is fixedly connected with the panel 3, the rear end of the workbench 1 is fixedly connected with the bracket 4, the upper end of the bracket 4 is equipped with a hydraulic cylinder 5, there are two drilling machines 6 and they are composed of a drill rod and a driving structure, the two drilling machines 6 are respectively symmetrically installed in the crossbeam 805 in the adjusting assembly, the rotating assembly is installed at the lower end of the workbench 1 and a belt 710 transmission structure is provided in the rotating assembly, the adjusting assembly is connected to the power output element of the hydraulic cylinder 5 and a threaded transmission structure is provided in the adjusting assembly, and the fixing assembly is installed at the upper end of the turntable 707 in the rotating assembly The workbench 1 serves as the basic support platform of the entire drilling device. The support legs 2 support the workbench 1 to keep the device stable as a whole. The enclosure 3 prevents debris generated during the drilling process from splashing and forms a protective barrier. The hydraulic cylinder 5 generates thrust or pull through the pressure change of the hydraulic oil to achieve motion control of the drilling machine 6. The drilling machine 6 performs the drilling operation and processes air holes on the integrated heat dissipation substrate of the circuit board. The drilling is achieved by driving the drill rod to rotate. The rotating component provides rotational motion so that the turntable 707 can drive the fixed component and the circuit board to be drilled to rotate to achieve the effect of multi-angle drilling. The adjusting component adjusts the position of the drilling machine 6 to meet the processing requirements of circuit boards of different sizes and shapes. The crossbeam 805 is moved forward and backward through threaded transmission to adjust the position of the drilling machine 6. The fixed component fixes the circuit board to be processed to prevent movement during the drilling process.

[0026] See also Figure 4In this embodiment, the rotating assembly includes a support 701, a servo motor 702 and a No. 1 rotating support seat 703; the support 701 is installed on the ground and is located at the lower end of the workbench 1, the servo motor 702 is installed on the left side of the upper end of the support 701, and the No. 1 rotating support seat 703 is installed on the right side of the upper end of the support 701. The rotating assembly also includes a coupling 704, a No. 1 rotating shaft 705, a No. 2 rotating shaft 706 and a turntable 707; the lower end of the No. 1 rotating shaft 705 is installed with a coupling 704 and is connected to the output shaft of the servo motor 702 through the coupling 704. The lower end of the second rotating shaft 706 is rotatably connected to the first rotating support seat 703, and the upper ends of the first rotating shaft 705 and the second rotating shaft 706 are fixedly connected to a turntable 707. The rotating assembly also includes a driving wheel 708, a driven wheel 709 and a belt 710; the driving wheel 708 is fixedly connected to the upper end outer wall of the first rotating shaft 705, and the driven wheel 709 is fixedly connected to the upper end outer wall of the second rotating shaft 706. The driving wheel 708 and the driven wheel 709 are rotated together and connected to the belt 710. The support 701 serves as the basic supporting structure of the rotating assembly, and is a servo motor 7 02 and the first rotating support seat 703 provide stable support, the servo motor 702 provides rotational power, and the smooth rotation of the turntable 707 is achieved by accurately controlling the speed and direction of the motor to meet different drilling requirements. The first rotating support seat 703 supports and fixes the second rotating shaft 706 to ensure its stability during the rotation process. The bearing is designed inside to reduce the friction of the second rotating shaft 706 during rotation. The coupling 704 connects the output shaft of the servo motor 702 and the first rotating shaft 705 to transmit the rotational power of the motor. The first rotating shaft 705 and The second rotating shaft 706 serves as a transmission component of the rotating assembly, which transmits the rotational power of the servo motor 702 to the turntable 707 to realize the rotational motion. The turntable 707 carries and fixes the circuit board to be processed, and rotates with the rotating shaft so as to perform drilling operations at multiple angles. The driving wheel 708 and the driven wheel 709 are connected by a belt 710 to realize the synchronous rotation of the first rotating shaft 705 and the second rotating shaft 706, ensuring that the two turntables 707 can rotate at the same speed and direction. The belt 710 transmission has the advantages of smooth transmission, low noise, and high transmission efficiency.

[0027] See also Figure 5-Figure 6In this embodiment, the adjustment component includes a longitudinal beam 801, a second rotating support seat 802 and a rotating motor 803; the lower end of the longitudinal beam 801 is connected to the power output element of the hydraulic cylinder 5, and a U-shaped groove is provided at the lower end of the longitudinal beam 801. The rotating motor 803 is installed at the front end of the longitudinal beam 801, and the second rotating support seat 802 is installed on the rear end inner wall of the U-shaped groove. The adjustment component also includes a threaded rod 804 and a cross beam 805; the front end of the threaded rod 804 is fixedly connected to the output shaft of the rotating motor 803, and the rear end of the threaded rod 804 is rotatably connected to the second rotating support seat 802. The cross beam An internal thread that matches the external thread of the threaded rod 804 is provided in 805. The threaded rod 804 is threadedly connected to the crossbeam 805. The longitudinal beam 801 is used as the main supporting structure of the adjustment component. The lower end is connected to the power output element of the hydraulic cylinder 5 and can move up and down according to the extension and contraction of the hydraulic cylinder 5. The second rotating support seat 802 supports and fixes the rear end of the threaded rod 804 so that it can rotate under the drive of the rotating motor 803. The rotating motor 803 provides rotating power to drive the threaded rod 804 to rotate, and then drives the crossbeam 805 to move forward and backward through the threaded connection. The threaded rod 804 is used as a transmission component. When the rotary motor 803 drives the threaded rod 804 to rotate, due to the interaction of the threads, the crossbeam 805 will move horizontally along the threaded rod 804. The crossbeam 805 carries and fixes the drilling machine 6. The drilling position is adjusted by horizontal movement. The fixing assembly includes a support plate 901, an adjusting screw 902, a knob 903 and a pressure block 904; the support plate 901 is L-shaped and fixedly connected to the upper end of the turntable 707. A screw hole is opened in the support plate 901. The adjusting screw 902 is adapted to the screw hole and is threadedly connected to the screw hole. The adjustment The upper end of the screw 902 is integrally fixedly connected with a knob 903, and the lower end of the adjusting screw 902 is fixedly connected with a pressure block 904. The support plate 901 serves as the basic supporting structure of the fixed component. The support plate 901 is provided with screw holes inside, and these screw holes are used to install and fix the adjusting screw 902. The adjusting screw 902 can achieve fine adjustment of the height through rotational motion, thereby controlling the degree of compression of the circuit board by the pressure block 904. The design of the knob 903 is convenient for the user to operate the adjusting screw 902 by rotation. The pressure block 904 is used to compress the circuit board substrate to ensure that it does not move during the drilling process.

[0028] When processing the circuit board, the staff first places the two circuit boards securely on the two turntables 707, and then gently rotates the knob 903. This action causes the adjusting screw 902 to slowly descend, and then pushes the pressing block 904 to approach and fit closely to the circuit board, thereby completing the work of firmly fixing the circuit board;

[0029] Next, the rotary motor 803 is activated, thereby driving the threaded rod 804 to start rotating. By utilizing the interaction force between the threads, the crossbeam 805 can move forward and backward under precise control, and this movement in turn drives the drilling machine 6 to adjust its position;

[0030] At the same time, the hydraulic cylinder 5 also starts to work, driving the longitudinal beam 801 to move downward. This action enables the drilling machine 6 to gradually approach and accurately contact the surface of the circuit board, thereby starting the drilling operation;

[0031] If the angle of the circuit board needs to be adjusted during the processing, the servo motor 702 is activated, and the servo motor 702 responds quickly to drive the No. 1 rotating shaft 705 to start rotating. This rotation further drives the synchronous rotation of the No. 2 rotating shaft 706 through the belt 710 transmission mechanism. As the two turntables 707 slowly rotate, the two circuit boards are also adjusted to the required angle, preparing for the next processing steps.

[0032] Through the above steps, through the coordinated work of the rotating component, the adjusting component and the fixing component, the circuit board can not only realize automatic rotation, thereby avoiding the tedious process of manual adjustment by workers, but also the horizontal position of the drilling machine 6 can be adjusted to adapt to various drilling requirements of the circuit board, while the fixing component ensures that the circuit board remains stable during the drilling process to avoid any movement, thus solving the problem that the traditional drilling machine cannot drill multiple groups of circuit boards at the same time and requires manual adjustment when adjusting the angle of the circuit board.

[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate, comprising a workbench (1), a support leg (2), a surrounding plate (3), a bracket (4), a hydraulic cylinder (5) and a drilling machine (6); characterized in that: It also includes a rotating assembly, an adjusting assembly and a fixing assembly; the lower end of the workbench (1) is fixedly connected to four legs (2) by fastening bolts, the upper end of the workbench (1) is fixedly connected to a panel (3), the rear end of the workbench (1) is fixedly connected to a bracket (4), the upper end of the bracket (4) is equipped with a hydraulic cylinder (5), there are two drilling machines (6) composed of a drill rod and a driving structure, the two drilling machines (6) are respectively symmetrically installed in the crossbeam (805) in the adjusting assembly, the rotating assembly is installed at the lower end of the workbench (1) and a belt (710) transmission structure is arranged in the rotating assembly, the adjusting assembly is connected to the power output element of the hydraulic cylinder (5) and a threaded transmission structure is arranged in the adjusting assembly, and the fixing assembly is installed at the upper end of the turntable (707) in the rotating assembly.

2. The ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate according to claim 1, characterized in that: The rotating assembly comprises a support (701), a servo motor (702) and a first rotating support seat (703); the support (701) is installed on the ground and located at the lower end of the workbench (1), the servo motor (702) is installed on the left side of the upper end of the support (701), and the first rotating support seat (703) is installed on the right side of the upper end of the support (701).

3. The ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate according to claim 2, characterized in that: The rotating assembly further comprises a coupling (704), a first rotating shaft (705), a second rotating shaft (706) and a rotating disk (707); the coupling (704) is installed at the lower end of the first rotating shaft (705) and is connected to the output shaft of the servo motor (702) through the coupling (704); the lower end of the second rotating shaft (706) is rotatably connected to the first rotating support seat (703); and the upper ends of the first rotating shaft (705) and the second rotating shaft (706) are fixedly connected to the rotating disk (707).

4. The ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate according to claim 3, characterized in that: The rotating assembly further comprises a driving wheel (708), a driven wheel (709) and a belt (710); the driving wheel (708) is fixedly connected to the upper outer wall of the first rotating shaft (705), the driven wheel (709) is fixedly connected to the upper outer wall of the second rotating shaft (706), and the driving wheel (708) and the driven wheel (709) are connected to the belt (710) so as to rotate together.

5. The ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate according to claim 4, characterized in that: The adjustment assembly comprises a longitudinal beam (801), a second rotating support seat (802) and a rotating motor (803); the lower end of the longitudinal beam (801) is connected to the power output element of the hydraulic cylinder (5), a U-shaped groove is provided at the lower end of the longitudinal beam (801), the rotating motor (803) is installed at the front end of the longitudinal beam (801), and the second rotating support seat (802) is installed at the rear end inner wall of the U-shaped groove.

6. The ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate according to claim 5, characterized in that: The adjustment assembly further comprises a threaded rod (804) and a crossbeam (805); the front end of the threaded rod (804) is fixedly connected to the output shaft of the rotary motor (803), the rear end of the threaded rod (804) is rotatably connected to the second rotary support seat (802), an internal thread matching the external thread of the threaded rod (804) is provided in the crossbeam (805), and the threaded rod (804) is threadedly connected to the crossbeam (805).

7. The ventilation hole drilling device for processing a circuit board heat dissipation integrated substrate according to claim 6, characterized in that: The fixing assembly comprises a support plate (901), an adjusting screw rod (902), a knob (903) and a pressing block (904); the support plate (901) is L-shaped and fixedly connected to the upper end of the rotating disk (707); a screw hole is provided in the support plate (901); the adjusting screw rod (902) is adapted to the screw hole and is threadedly connected to the screw hole; the upper end of the adjusting screw rod (902) is integrally fixedly connected to the knob (903); and the lower end of the adjusting screw rod (902) is fixedly connected to the pressing block (904).