A thrust bearing automatic assembly machine

Abstract

The application discloses a thrust bearing automatic assembling machine, which comprises a rack and at least one ball assembling station arranged on the rack. The ball assembling station comprises a blanking device for realizing automatic blanking of rolling bodies; a positioning device arranged below the blanking device for realizing positioning of a retainer; and a loading device arranged between the blanking device and the positioning device for assembling the rolling bodies blanked by the blanking device into the retainer on the positioning device. The thrust bearing automatic assembling machine can realize automatic assembling of the rolling bodies in the retainer, reduce labor intensity and improve production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing, in particular to a thrust bearing automatic assembly machine. BACKGROUND

[0002] Thrust ball bearing is a bearing for bearing axial force, including shaft ring, seat ring, retainer and a plurality of steel balls placed in the retainer. The current assembly process of thrust ball bearing is that the required steel balls are manually pressed into the retainer window one by one by fingers. This installation method consumes a lot of manpower and labor, has low production efficiency, high cost, and is not conducive to batch production and large-scale production. SUMMARY

[0003] The present application aims to provide a thrust bearing automatic assembly machine, which can improve production efficiency.

[0004] Based on the above problems, the technical scheme provided by the present application is:

[0005] A thrust bearing automatic assembly machine, comprising a rack and at least one ball loading station arranged on the rack, the ball loading station comprising:

[0006] A blanking device for automatically blanking rolling elements;

[0007] A positioning device arranged below the blanking device for positioning the retainer;

[0008] A loading device arranged between the blanking device and the positioning device for assembling a plurality of rolling elements blanked by the blanking device into the retainer on the positioning device.

[0009] Further, the blanking device comprises a support frame, a hopper fixed on the support frame, a plurality of guide pipes extending into the hopper, and a guide driving mechanism mounted on the support frame, the plurality of guide pipes are drivingly connected with the guide driving mechanism and move up and down under the driving of the guide driving mechanism, and the lower ends of the guide pipes are connected to the loading device.

[0010] Further, the guide driving mechanism comprises a motor, an eccentric shaft arranged at the power output end of the motor, a roller mounted on the eccentric shaft, and a guide plate assembly in rolling cooperation with the roller, and the plurality of guide pipes are connected with the guide plate assembly.

[0011] The guide plate assembly comprises a guide plate and a mounting plate fixedly connected with the guide plate, the guide plate is provided with a rolling hole in rolling cooperation with the roller, the rolling hole is a waist-shaped hole, the plurality of guide pipes are fixed on a guide head, and the guide head is fixedly connected with the mounting plate.

[0012] Further, the material guiding driving mechanism further comprises two guiding assemblies symmetrically arranged above and below, each of the guiding assemblies comprises a support plate fixed on the support frame and a guiding rod fixed on the support plate and extending in the vertical direction, and the mounting plate is provided with a guiding portion for the guiding rod to extend into.

[0013] Further, the positioning device comprises a support, a positioning seat fixed on the support, a lower die seat fixed on the positioning seat, a material pushing sleeve assembly and a ejector rod assembly, the lower die seat is provided with a limiting table for the holding frame to be arranged into, the material pushing sleeve assembly comprises a material pushing sleeve arranged between the positioning seat and the support, a material pushing rod fixed on the material pushing sleeve and a first elastic member arranged between the material pushing sleeve and the positioning seat, the material pushing rod extends to the lower die seat through the positioning seat, and the material pushing rod can extend into the window hole of the holding frame under the driving of the ejector rod assembly.

[0014] Further, the ejector rod assembly comprises an ejector rod penetrating into the support and a first driving member in transmission connection with the ejector rod, and the ejector rod moves up and down under the driving of the first driving member to abut against or separate from the material pushing sleeve.

[0015] Further, the material loading device comprises a mounting frame, a jig plate in sliding cooperation with the mounting frame, a second driving member for driving the jig plate to move up and down, a ball loading mechanism mounted on the jig plate and a pressure head mechanism for pressing a plurality of rolling bodies in the ball loading mechanism into the holding frame.

[0016] Further, the ball loading mechanism comprises a needle head fixed on the lower end of the jig plate, an upper die seat fixed on the lower end of the needle head, a ball pressing component movably arranged in the needle head and a second elastic member arranged between the ball pressing component and the upper die seat.

[0017] Further, the upper die seat is provided with a plurality of needle roller channels arranged at intervals in the circumferential direction, the needle roller channels extend in the radial direction of the upper die seat, the needle roller channels located on the radial outer side of the upper die seat are feeding ports, the needle roller channels located on the radial inner side of the upper die seat are discharging ports, the feeding ports are connected with the material discharging device, and the discharging ports correspond to the window holes of the holding frame; the ball pressing component comprises a ball pressing plate and a plurality of ejector pins arranged on the lower end of the ball pressing plate, and the plurality of ejector pins correspond to the positions of the plurality of discharging ports.

[0018] Further, the pressure head mechanism comprises a pressure head arranged opposite to the ball pressing component and a third driving member, the pressure head is in transmission connection with the third driving member and approaches or moves away from the ball pressing component under the driving of the third driving member.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The plurality of steel balls can be automatically installed in the window holes of the retainer, so as to avoid manual installation, reduce labor intensity and production cost, and improve production efficiency; when two or more ball installation stations are arranged, only one person is needed to operate the whole machine, so that large-scale and batch production of products can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. The drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 FIG. 1 is a structural schematic diagram of one embodiment of the thrust bearing automatic assembly machine of the present application;

[0023] Figure 2 FIG. 2 is a structural schematic diagram of another embodiment of the thrust bearing automatic assembly machine of the present application;

[0024] Figure 3 FIG. 3 is a structural schematic diagram of the blanking device in the embodiment of the present application;

[0025] Figure 4 FIG. 4 is a structural schematic diagram of the installation structure of the roller and the eccentric shaft in the embodiment of the present application;

[0026] Figure 5 FIG. 5 is a structural schematic diagram of the guide plate in the embodiment of the present application;

[0027] Figure 6 FIG. 6 is a structural schematic diagram of the positioning device in the embodiment of the present application;

[0028] Figure 7 FIG. 7 is a structural schematic diagram of the lower die seat in the embodiment of the present application;

[0029] Figure 8 FIG. 8 is a structural schematic diagram of the charging device in the embodiment of the present application;

[0030] Figure 9 FIG. 9 is a structural schematic diagram of the ball pressing component in the embodiment of the present application;

[0031] Figure 10 FIG. 10 is a structural schematic diagram of one of the upper die seats in the embodiment of the present application;

[0032] Figure 11 FIG. 11 is a structural schematic diagram of another of the upper die seats in the embodiment of the present application;

[0033] Wherein:

[0034] 1, frame;

[0035] 2. Feeding device; 2-1. Support frame; 2-1a. First support plate; 2-1b. Second support plate; 2-2. Material bin; 2-3. Guide pipe; 2-4. Motor; 2-5. Eccentric shaft; 2-6. Roller; 2-7. Guide plate; 2-7a. Rolling hole; 2-8. Mounting plate; 2-8a. Guide part; 2-9. Guide rod; 2-10. Support plate component; 2-11. Guide head; 2-12. Connecting component; 2-13. Linear bearing; 2-14. Bearing;

[0036] 3. Positioning device; 3-1. Support; 3-2. Positioning seat; 3-2a. Through hole; 3-3. Lower mold base; 3-4. Ejector sleeve; 3-5. Ejector rod; 3-6. First elastic element; 3-7. Ejector rod; 3-8. First driving component;

[0037] 4. Loading device; 4-1. Mounting bracket; 4-2. Fixture plate; 4-3. Second drive component; 4-4. Ball pressing component; 4-4a. Ball pressing plate; 4-4b. Ejector pin; 4-4c. Limiting groove; 4-5. Needle loading head; 4-6. Upper mold base; 4-6a. Needle roller channel; 4-6b. Through groove; 4-7. Pressing head; 4-8. Third drive component; 4-9. Limiting component; 4-10. Second elastic component;

[0038] 5. Control unit;

[0039] 6. Bracket; 6-1. Support column; 6-2. Connecting plate;

[0040] 7. Mounting rack;

[0041] 8. Support platform; 8-1. Support plate; 8-2. Support rod;

[0042] 9. Cage;

[0043] 10. Rolling elements;

[0044] 11. Feed pipe. Detailed Implementation

[0045] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0046] See Figure 1 and Figure 2As a structural schematic view of the application, the application provides a thrust bearing automatic assembly machine, which comprises a rack 1 and two ball loading stations arranged on the rack 1, each ball loading station comprising a blanking device 2, a positioning device 3 and a loading device 4, the blanking device 2, the positioning device 3 and the loading device 4 being signal connected with a control unit 5 to realize automatic assembly of rolling elements of the thrust bearing.

[0047] As shown in Figure 3 , the blanking device 2 is used to realize automatic blanking of rolling elements 10 (such as steel balls) and comprises a support frame 2-1, a hopper 2-2 fixed on the support frame 2-1, a plurality of guide pipes 2-3 extending into the hopper 2-2 at the upper end and a guide driving mechanism installed on the support frame 2-1, the plurality of guide pipes 2-3 being drivingly connected with the guide driving mechanism and moving up and down under the driving of the guide driving mechanism, and the lower end of the guide pipe 2-3 being connected to the loading device 4. Preferably, the guide pipe 2-3 is made of stainless steel.

[0048] The support frame 2-1 comprises a first support plate 2-1a extending in the horizontal direction and a second support plate 2-1b arranged in the vertical direction, the first support plate 2-1a and the second support plate 2-1b being connected in an L shape, the second support plate 2-1b being fixedly arranged on a support 6 of the rack 1, the support 6 comprising two support columns 6-1 arranged oppositely and a connecting plate 6-2 connecting the two support columns 6-1, and the second support plate 2-1b being fixedly connected with the connecting plate 6-2 through a connecting member.

[0049] The guide driving mechanism comprises a motor 2-4 installed on the second support plate 2-1b, an eccentric shaft 2-5 arranged at the power output end of the motor 2-4, a roller 2-6 installed on the eccentric shaft 2-5 and a guide plate assembly in rolling cooperation with the roller 2-6, the plurality of guide pipes 2-3 being connected with the guide plate assembly, and the roller 2-6 being supported on the eccentric shaft 2-5 through a bearing 2-14 (as shown in Figure 4 ).

[0050] The guide plate assembly comprises a guide plate 2-7 and a mounting plate 2-8 fixedly connected with the guide plate 2-7, a rolling hole 2-7a cooperating with the roller 2-6 being arranged on the guide plate 2-7, the rolling hole 2-7a being a waist-shaped hole (as shown in Figure 5 ), the waist-shaped hole extending in the horizontal direction, and the roller 2-6 reciprocally rolling in the rolling hole 2-7a under the driving of the eccentric shaft 2-5, so as to drive the guide plate 2-7 to move up and down.

[0051] In the example, the plurality of guide pipes 2-3 are fixed on the guide head 2-11 and evenly spaced along the circumference of the guide head 2-11, and the guide head 2-11 is fixedly connected with the mounting plate 2-8 through the connecting piece 2-12. Thus, the guide plate 2-7 drives the mounting plate 2-8 to move up and down during the movement, and in turn drives the plurality of guide pipes 2-3 to move up and down, so as to fill the steel balls in the hopper 2-2 into the guide pipes 2-3.

[0052] In order to improve the stability of the guide driving mechanism, two guide assemblies arranged symmetrically up and down are further provided. Specifically, the guide assembly includes a support piece 2-10 fixed on the second support plate 2-1b and a guide rod 2-9 fixed on the support piece 2-10 and extending in the vertical direction. The mounting plate 2-8 is provided with a guide portion 2-8a for the guide rod 2-9 to extend into on the side facing the second support plate 2-1b. A linear bearing 2-13 is arranged on the guide portion 2-8a to support the guide rod 2-9. When the guide plate 2-7 moves up and down under the driving of the eccentric shaft 2-5, the guide portion 2-8a of the mounting plate 2-8 slides up and down along the guide rod 2-9 to play a guiding role and improve the stability of the operation of the guide driving mechanism.

[0053] The positioning device 3 is arranged below the discharging device 2 and is used to realize the positioning of the retainer 9, as shown in Figure 6 and Figure 7 The positioning device 3 includes a support 3-1, a positioning seat 3-2 fixed on the support 3-1, a lower mold seat 3-3 fixed on the positioning seat 3-2, a top sleeve assembly and a top rod assembly. The lower mold seat 3-3 is provided with a limiting table for the retainer 9 to be placed into. The top sleeve assembly includes a top sleeve 3-4 arranged between the positioning seat 3-2 and the support 3-1, a top rod 3-5 fixed on the top sleeve 3-4 and a first elastic member 3-6 arranged between the top sleeve 3-4 and the positioning seat 3-2. The lower mold seat 3-3 is provided with a through hole 3-2a for the top rod 3-5 to extend into, and the support 3-1 is provided with a limiting table matched with the top sleeve 3-4. The top rod 3-5 extends to the lower mold seat 3-3 through the positioning seat 3-2, and the top rod 3-5 can extend into the window hole of the retainer 9 under the driving of the top rod assembly. Preferably, the first elastic member 3-6 is a spring.

[0054] The top rod assembly includes a top rod 3-7 penetrating the support 3-1 and a first driving member 3-8 in driving connection with the top rod 3-7. The top rod 3-7 moves up and down under the driving of the first driving member 3-8 to abut or separate from the top sleeve 3-4. Preferably, the first driving member 3-8 is a pneumatic cylinder. The first driving member 3-8 is mounted on the rack 1 through the mounting bracket 7, and the positioning seat 3-2 is fixed on the support table 8 above the table top of the rack 1. The support table 8 includes a plurality of support rods 8-2 and a support plate 8-1 arranged on the upper ends of the plurality of support rods 8-2.

[0055] When the positioning holder 9 is positioned, the first driving part 3-8 drives the top rod 3-7 to extend, and the worker places the positioning holder 9 on the lower die seat 3-3 and makes the material pushing rod 3-5 extend into the window hole of the positioning holder 9 to position the positioning holder 9. When the steel ball is installed, the first driving part 3-8 drives the top rod 3-7 to retract, the material pushing sleeve 3-4 moves downward under the action of the first elastic member 3-6, and the material pushing rod 3-5 is withdrawn from the positioning holder 9, so as to facilitate the installation of the steel ball.

[0056] The loading device 4 is arranged between the discharging device 2 and the positioning device 3, and is used for assembling the plurality of rolling bodies 10 discharged by the discharging device 2 into the window hole of the positioning holder 9 on the positioning device 3. Specifically, as shown in Figure 8 , the loading device 4 includes a mounting frame 4-1, a jig plate 4-2 in sliding cooperation with the mounting frame 4-1, a second driving part 4-3 for driving the jig plate 4-2 to move up and down, a ball installing mechanism installed on the jig plate 4-2, and a pressing head mechanism for pressing the plurality of rolling bodies 10 in the ball installing mechanism into the positioning holder 9.

[0057] Specifically, the ball installing mechanism includes a needle head 4-5 fixed at the lower end of the jig plate 4-2, an upper die seat 4-6 fixed at the lower end of the needle head 4-5, a ball pressing part 4-4 movably arranged in the needle head 4-5, and a second elastic member 4-10 arranged between the ball pressing part 4-4 and the upper die seat 4-6, wherein the second elastic member 4-10 is a spring. As shown in Figure 9 , the ball pressing part 4-4 includes a ball pressing plate 4-4a and a plurality of top pins 4-4b arranged at the lower end of the ball pressing plate 4-4a. The ball pressing plate 4-4a is arranged in the jig plate 4-2 and the needle head 4-5, and the side of the ball pressing plate 4-4a is provided with a limiting recess 4-4c extending in the vertical direction, and the needle head 4-5 is provided with a limiting member 4-9 extending into the limiting recess 4-4c. The ball pressing plate 4-4a can move up and down in the needle head 4-5 and is limited in the needle head 4-5 by the limiting member 4-9.

[0058] As shown in Figure 10 and Figure 11As shown, the upper die seat 4-6 is provided with a plurality of needle passages 4-6a arranged in a circumferential direction, each needle passage 4-6a extends in a radial direction of the upper die seat 4-6, the inlet of the needle passage 4-6a is located at the radial outer side of the upper die seat 4-6, and the outlet is located at the radial inner side of the upper die seat 4-6, wherein the inlet is connected with the guide pipe 2-3 through the discharge pipe 11, preferably, the discharge pipe 11 is a spring pipe, which is convenient for connection with the upper die seat 4-6 and discharging. The outlet corresponds to the window hole of the retainer 9, a plurality of ejector pins 4-4b on the ball pressing plate 4-4a correspond to the positions of a plurality of outlets, and a through slot 4-6b is arranged on the upper die seat 4-6 for the ejector pins 4-4b to extend into, when the ejector pins 4-4b extend into the upper die seat 4-6 through the through slot 4-6b, the outlets of the needle passages 4-6a can be blocked or the rolling body 10 can be pressed into the window hole of the retainer 9.

[0059] The pressure head mechanism comprises a pressure head 4-7 and a third driving component 4-8 arranged opposite to the ball pressing component 4-4, the pressure head 4-7 is in transmission connection with the third driving component 4-8 and moves close to or away from the ball pressing component 4-4 under the driving of the third driving component 4-8, when the rolling body 10 in the hopper 2-2 is transported into the needle passage 4-6a of the upper die seat 4-6, the pressure head 4-7 presses the ball pressing plate 4-4a under the driving of the third driving component 4-8, and the ejector pins 4-4b block the outlets of the needle passages 4-6a, when the retainer 9 is positioned, the pressure head 4-7 moves upward under the driving of the third driving component 4-8, the ball pressing plate 4-4a moves upward under the action of the second elastic member 4-10, the plurality of ejector pins 4-4b move upward, the outlets of the needle passages 4-6a are opened, the steel balls in the needle passages 4-6a roll to the ball loading position of the upper die seat 4-6, and then the pressure head 4-7 moves downward under the driving of the third driving component 4-8, and the steel balls are installed in the retainer 9 through the ejector pins 4-4b.

[0060] The working principle of the present application is as follows:

[0061] The motor 2-4 is started, the motor 2-4 rotates to drive the eccentric shaft 2-5 to rotate, the roller 2-6 rotates to drive the guide plate 2-7 to move up and down, under the action of the guide assembly, the mounting plate 2-8 moves up and down at a constant speed, the mounting plate 2-8 drives the guide pipe 2-3 to move up and down, the guide pipe 2-3 moves up and down in the hopper 2-2, the steel balls enter the guide pipe 2-3, and then enter the needle passage 4-6a of the upper die seat 4-6 through the discharge pipe 11. The jig plate 4-2 moves downward under the driving of the second driving component 4-3, the upper die seat 4-6 moves to the upper end surface of the retainer 9, the ball pressing plate 4-4a moves downward under the driving of the third driving component 4-8, and the ejector pins 4-4b block the outlets of the needle passages 4-6a.

[0062] The first driving part 3-8 drives the ejector rod 3-7 to extend, the material ejecting rod 3-5 extends to the lower die seat 3-3, the retainer 9 is manually placed on the lower die seat 3-3 and positioned by the material ejecting rod 3-5, the first driving part 3-8 drives the ejector rod 3-7 to retreat, the material ejecting rod 3-5 moves downward under the action of the first elastic member 3-6, and the positioning of the retainer 9 is completed.

[0063] When the balls are loaded, the third driving part 4-8 drives the pressure head 4-7 to move upward, the ball pressing plate 4-4a moves upward under the action of the second elastic member 4-10, the ejector pin 4-4b is away from the discharge port of the needle passage 4-6a, the steel balls in the needle passage 4-6a enter the ball loading position of the upper die seat 4-6, and meanwhile the third driving part 4-8 drives the ball pressing plate 4-4a to move downward, the plurality of ejector pins 4-4b press the plurality of steel balls into the retainer 9, and the installation of the steel balls is completed.

[0064] In summary, the assembly machine can realize automatic installation of a plurality of rolling elements in the retainer, reduces labor intensity, and improves production efficiency.

[0065] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. An automatic assembly machine for thrust bearings, characterized in that: Includes a frame and at least one ball loading station disposed on the frame, the ball loading station comprising: The feeding device is used to automatically feed the rolling elements; A positioning device is disposed below the feeding device to position the cage. A loading device is disposed between the feeding device and the positioning device, and is used to assemble a plurality of rolling elements fed by the feeding device into a cage on the positioning device; The loading device includes a mounting frame, a fixture plate that slides with the mounting frame, a second driving component that drives the fixture plate to move up and down, a ball loading mechanism mounted on the fixture plate, and a pressing head mechanism for pressing a plurality of rolling elements in the ball loading mechanism into the retainer. The ball loading mechanism includes a loading needle fixed to the lower end of the fixture plate, an upper mold base fixed to the lower end of the loading needle, a ball pressing component that can be moved up and down inside the loading needle, and a second elastic element disposed between the ball pressing component and the upper mold base. The upper mold base is provided with a plurality of needle roller channels arranged circumferentially. The needle roller channels extend radially along the upper mold base. The needle roller channels located on the radially outer side of the upper mold base are the inlet and located on the radially inner side of the upper mold base are the outlet. The inlet is connected to the unloading device, and the outlet corresponds to the window of the retainer. The ball pressing component includes a ball pressing plate and a plurality of ejector pins disposed at the lower end of the ball pressing plate. The plurality of ejector pins correspond to the positions of the plurality of outlets. The ball pressing plate passes through the fixture plate and the needle loading head. The side of the ball pressing plate is provided with a limiting groove extending in the vertical direction, and the needle loading head is provided with a limiting member extending into the limiting groove.

2. The automatic thrust bearing assembly machine according to claim 1, characterized in that: The feeding device includes a support frame, a hopper fixed on the support frame, multiple guide pipes extending into the hopper at their upper ends, and a guide drive mechanism installed on the support frame. The multiple guide pipes are connected to the guide drive mechanism and move up and down under the drive of the guide drive mechanism. The lower ends of the guide pipes are connected to the loading device.

3. The automatic thrust bearing assembly machine according to claim 2, characterized in that: The material guiding drive mechanism includes a motor, an eccentric shaft disposed at the power output end of the motor, a roller mounted on the eccentric shaft, and a material guiding plate assembly that rolls with the roller; the plurality of material guiding tubes are connected to the material guiding plate assembly. The guide plate assembly includes a guide plate and a mounting plate fixedly connected to the guide plate. The guide plate is provided with rolling holes that cooperate with the rollers. The rolling holes are oblong holes. The plurality of guide tubes are fixed to the guide head. The guide head is fixedly connected to the mounting plate.

4. The automatic thrust bearing assembly machine according to claim 3, characterized in that: The material guiding drive mechanism also includes two guide components arranged symmetrically on the upper and lower sides. The guide components include a support plate fixed on the support frame and a guide rod fixed on the support plate and extending in the vertical direction. The mounting plate is provided with a guide portion for the guide rod to extend into.

5. The automatic thrust bearing assembly machine according to claim 1, characterized in that: The positioning device includes a support, a positioning seat fixed on the support, a lower mold base fixed on the positioning seat, an ejector sleeve assembly, and an ejector rod assembly. The lower mold base is provided with a limiting platform for inserting the retainer. The ejector sleeve assembly includes an ejector sleeve placed between the positioning seat and the support, an ejector rod fixed on the ejector sleeve, and a first elastic member disposed between the ejector sleeve and the positioning seat. The ejector rod extends through the positioning seat to the lower mold base, and the ejector rod can extend into the window hole of the retainer under the action of the ejector rod assembly.

6. The automatic thrust bearing assembly machine according to claim 5, characterized in that: The top rod assembly includes a top rod passing through the support and a first driving component that is pulsatorically connected to the top rod. The top rod moves up and down under the drive of the first driving component to abut against or separate from the top material sleeve.

7. The automatic thrust bearing assembly machine according to claim 1, characterized in that: The pressure head mechanism includes a pressure head and a third driving component disposed opposite to the ball pressing component. The pressure head is connected to the third driving component and moves closer to or away from the ball pressing component under the drive of the third driving component.

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