A grinding machine for grinding inner spherical surface of ball hinge

Abstract

The application relates to a grinding machine for grinding inner spherical surface of ball hinge, which comprises a machine body, workpiece clamping device, grinding head driving device, ball head grinding tool, liquid supply system and control system. The machine body comprises a frame, workpiece clamping device mounting frame installed on the top of the frame, driving device mounting frame and damping device mounting frame installed between the two side plates of the workpiece clamping device mounting frame. The liquid return tank of the liquid supply system is installed in the middle and upper space of the frame. A set of workpiece clamping devices are installed in each workpiece clamping device mounting position on the bottom flat plate of the workpiece clamping device mounting frame. A set of grinding head driving devices are installed in each mounting hole of the driving device mounting frame. A set of spring damping devices are installed in each damping device mounting hole of the damping device mounting frame. The grinding head driving device comprises a planetary gear transmission mechanism, a servo motor connected to the input end of the planetary gear transmission mechanism and a shaft coupling connected to the output end of the planetary gear transmission mechanism. The application improves the grinding quality and surface smoothness of the inner spherical surface.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mechanical processing equipment, and particularly relates to a grinding machine for grinding inner spherical surface of ball hinge. BACKGROUND

[0002] In the mechanical manufacturing industry, the ball hinge, as a spherical surface moving component, is composed of a ball seat 1, a ball shaft neck 3 and a ball gland 2. The ball shaft neck realizes free rotation within a certain range without jamming and without running phenomenon. The ball hinge is widely used, but the traditional grinding equipment cannot well meet the processing requirements of high precision and high efficiency when grinding the inner spherical surface of the ball hinge due to the limitation of the equipment structure. Therefore, a new grinding machine for grinding the inner spherical surface of the ball hinge is developed to realize automatic grinding of the spherical surface, meet the technical requirements and improve the production efficiency. SUMMARY

[0003] The present application is proposed to improve the grinding quality and surface smoothness of the inner spherical surface of the ball hinge.

[0004] The above-mentioned object of the present application is realized by the following technical scheme:

[0005] The grinding machine for grinding the inner spherical surface of the ball hinge comprises a machine body, a workpiece clamping device, a grinding head driving device, a ball head grinding tool, a liquid supply system and a control system.

[0006] The machine body comprises a frame, a workpiece clamping device mounting rack, a driving device mounting rack and a damping device mounting rack. The frame is a cubic frame body. The upper space in the frame is used for installing a liquid return tank of the liquid supply system. An opening is arranged on the top of the frame corresponding to the liquid inlet of the liquid return tank.

[0007] The workpiece clamping device mounting rack is fixed above the frame and is composed of a bottom plate and left and right side plates vertically fixed to the upper end of the bottom plate close to the rear. A plurality of workpiece clamping device mounting positions are arranged on the bottom plate along the left and right sides. Each workpiece clamping device mounting position is provided with a liquid return hole corresponding to the opening of the frame. Each workpiece clamping device mounting position is fixedly installed with a set of workpiece clamping devices. The driving device mounting rack and the damping device mounting rack are installed between the left and right side plates. A plurality of mounting holes are arranged on the driving device mounting rack along the left and right sides. A set of grinding head driving devices is installed at each mounting hole. A plurality of buffer device mounting holes are arranged on the damping device mounting rack along the left and right sides. A set of spring damping devices is installed in each buffer device mounting hole. The plurality of workpiece clamping mounting positions, the plurality of mounting holes and the plurality of buffer device mounting holes are one-to-one corresponding.

[0008] The workpiece clamping device comprises a ball seat positioning and pressing mechanism and a ball gland pressing mechanism, which are used to realize the pressing and fixing of the ball seat and the following pressing of the ball gland.

[0009] The grinding head driving device comprises a servo motor, a gear transmission mechanism, a shaft coupling, and a grinding tool mounting joint. The gear transmission mechanism comprises a gear ring seat, a center wheel, a planetary wheel, and a planet carrier. The gear ring seat is fixedly installed in the corresponding mounting hole on the driving device mounting frame. The gear ring seat is provided with a bottom on the back surface and an inner cavity provided with inner teeth. A center hole is arranged on the bottom of the gear ring seat. The servo motor is fixedly connected with the bottom surface of the gear ring seat. The output shaft of the servo motor extends through the center hole on the bottom of the gear ring seat and extends into the inner cavity of the gear ring seat. The center wheel and the planetary wheel are arranged in the inner cavity of the gear ring seat. The center wheel is fixedly installed on the output shaft of the servo motor. One end of the planet carrier is rotatably connected with the output shaft of the servo motor. The other end of the planet carrier is rotatably connected with the planetary wheel shaft. The planetary wheel is fixedly installed on the planetary wheel shaft. The planetary wheel is simultaneously engaged with the center wheel and the inner teeth of the gear ring seat. The shaft coupling passes through the inner hole of the spring damping device. One end of the shaft coupling is connected with the front end of the planetary wheel shaft through a universal hinge. The other end of the shaft coupling is connected with the rear end of the grinding tool mounting joint through a universal hinge. The front end of the grinding tool mounting joint is provided with a socket for fixedly connecting with the rear end of the rod body of the ball head grinding tool.

[0010] Moreover, the mounting hole on the driving device mounting frame adopts a mounting hole structure with a slotted upper end. The width of the slot is greater than the outer diameter of the shaft coupling. The hole diameter of the mounting hole matches the outer diameter of the gear ring seat. Two threaded holes are oppositely arranged at the slotted offset position on the edge of the mounting hole. Two guide protrusions are oppositely arranged on the outer surface of the gear ring seat near the upper part. A through slot is arranged on each guide protrusion. The two through slots on the two guide protrusions are respectively aligned with the two threaded holes on the edge of the mounting hole. A set of connecting members are respectively installed to fix the grinding head driving device on the driving device mounting frame.

[0011] Moreover, the connecting member is composed of a universal hinge and a connecting screw. The lower end of the universal hinge is provided with an external threaded rod. The upper end of the universal hinge is provided with a threaded hole. The universal hinge is connected with the threaded hole on the driving device mounting frame through the external threaded rod. The universal hinge is installed in the through slot of the corresponding guide protrusion. The connecting screw is connected with the threaded hole on the upper end of the universal hinge and is pressed against the upper end of the guide protrusion.

[0012] Moreover, the spring damping device is composed of an outer ring, an inner ring, and four groups of damping springs embedded between the outer ring and the inner ring. Screw through holes are arranged on the outer ring near the four corners. The mounting hole of the buffer device is a stepped hole composed of a square hole and a circular hole. Threaded holes are arranged on the bottom of the square hole near the four corners. The spring damping device is installed in the square hole. Screws are installed in the four screw through holes and the corresponding threaded holes on the bottom of the square hole to fix the spring damping device in the corresponding mounting hole of the buffer device.

[0013] Furthermore, the ball head surface of the ball head tool is embedded with a grinding layer made of high-hardness diamond or silicon carbide wear-resistant material.

[0014] Furthermore, the liquid supply system is composed of a liquid return tank, a conveying pump, a precision flow regulator and a conveying pipeline; the liquid return tank is installed at a middle upper space position in the frame and is composed of an upper recovery funnel and a lower storage tank body; the liquid return tank is provided with a liquid outlet interface; the lower end of the conveying pipeline is connected to the liquid outlet interface and the upper end extends to above the grinding operation position to realize conveying of the grinding liquid to the grinding operation gap of the ball joint through liquid showering; the conveying pump and the precision flow regulator are connected to the conveying pipeline.

[0015] The present application has the advantages and positive effects that:

[0016] 1. The workpiece clamping device is used for fixing the ball seat, and the ball gland is pressed on the upper side of the ball seat in a manner that it can move up and down and rotate in the plane direction, so that the self-adaptation of the ball joint spherical surface matching during the grinding process is realized.

[0017] 2. The grinding head driving device adopts a planetary gear transmission mechanism and cooperates with two universal hinges to form a multi-axis linkage mechanism, so that the grinding tool can accurately grind the inner spherical surface of the ball joint in multiple aspects, high-precision processing of complex curved surfaces is realized, and the grinding quality and surface smoothness of the inner spherical surface are improved.

[0018] 3. The mounting hole on the driving device mounting frame is provided with a slot at the upper edge, and the coupling passes through the slot, so that the overall disassembly and installation of the grinding head driving device can be conveniently realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a ball joint assembly according to the present application;

[0020] Figure 2 It is a schematic structural diagram of a grinding machine for grinding the inner spherical surface of a ball joint according to the present application;

[0021] Figure 3 It is an exploded view of the grinding machine for grinding the inner spherical surface of a ball joint according to the present application;

[0022] Figure 4 It is a perspective assembly view of the machine body in the grinding machine for grinding the inner spherical surface of a ball joint according to the present application;

[0023] Figure 5 It is a schematic structural diagram of a workpiece clamping device in the grinding machine for grinding the inner spherical surface of a ball joint according to the present application; 5a, overall view; 5b, perspective view without bottom shell Figure 1 ; 5c, perspective view without bottom shellFigure 2 ;

[0024] Figure 6 is the structure schematic diagram of the driving device of the grinding head in the grinding machine for grinding inner spherical surface of ball hinge.

[0025] Figure 7 is the installation partial schematic diagram of the gear ring seat in the driving device of the grinding head in the grinding machine;

[0026] Figure 8 is Figure 7 the structure schematic diagram of the connecting piece in the driving device of the grinding head in the grinding machine;

[0027] Figure 9 is the structure schematic diagram of the damping device in the grinding machine. DETAILED DESCRIPTION

[0028] The structure of the present application is further explained in the following by embodiments in connection with the drawings. It is to be noted that the embodiments are descriptive rather than limiting.

[0029] A grinding machine for grinding inner spherical surface of ball hinge, as shown in Figures 1-9 , mainly comprises a machine body 4, a workpiece clamping device 6, a grinding head driving device 7, a ball head grinding tool 9, a liquid supply system 5 and a control system.

[0030] The machine body, as shown in the attached Figure 3 and the attached Figure 4As shown, the main components include: a frame 4.1, a workpiece clamping device mounting bracket 4.2, a drive device mounting bracket 4.4, and a shock-absorbing device mounting bracket 4.3. The frame uses a robust metal frame as its main structure, made of aluminum alloy, and is cubic in shape to provide stable support. An outer shell covers the frame, protecting the internal components of the liquid supply system and providing dust protection; the outer shell is made of thin steel plate. The surface is painted to improve corrosion resistance and aesthetics. The upper-middle space 4.1.2 within the frame is used to install the return tank of the liquid supply system, and an opening 4.1.1 is provided at the top of the frame corresponding to the inlet of the return tank. The workpiece clamping device mounting bracket is fixed to the top of the frame and consists of a base plate and left and right side plates vertically fixed to the upper end of the base plate near the rear. Multiple workpiece clamping device mounting positions are provided along the left and right sides of the base plate. Each workpiece clamping device mounting position has a return hole 4.2.1 corresponding to the opening in the frame, and the return hole is oriented as shown in the attached diagram. Each workpiece clamping device mounting position can accommodate one set of workpiece clamping devices. In this embodiment, three sets of workpiece clamping devices are provided. A positioning reference surface and threaded holes are provided on the bottom plate to ensure that the workpiece clamping devices can be firmly fixed to the frame and will not loosen during grinding rotation vibration. The drive device mounting frame and the shock absorber mounting frame are mounted vertically between the left and right side plates. Multiple mounting holes 4.4.1 are provided on the left and right sides of the drive device mounting frame, and multiple buffer device mounting holes are provided on the left and right sides of the shock absorber mounting frame. The multiple workpiece clamping mounting positions, multiple mounting holes, and multiple buffer device mounting holes correspond one-to-one.

[0031] The workpiece clamping device is used to achieve the clamping and fixing of the ball seat and the follow-up clamping of the ball cover, such as... Figure 5The device has been disclosed in the invention patent application with application number 2022109503424 and name "ball hinge grinding pressure device", mainly including ball seat positioning and pressing mechanism and ball gland pressing mechanism. The ball seat positioning and pressing mechanism is composed of wedge-shaped matching structure on one side and elastic pressing structure 6.5 on the other side. The wedge-shaped matching structure is composed of wedge-shaped block 6.6 and wedge-shaped surface on the base. The upper end of the wedge-shaped block is connected with the guide rod 6.2, and the guide rod is connected with the core of the electromagnetic combination 6.1. The core is driven to move downward by the extension of the core, and the wedge-shaped block is matched with the wedge-shaped surface to push the ball seat to move towards the elastic pressing structure, so as to realize the pressing of the ball seat. The ball gland pressing mechanism adopts the combination structure of guide sleeve 6.3 and positioning pin 6.4 fixed on the guide sleeve. The guide sleeve is movably arranged on the guide rod in the horizontal direction, and the positioning pin is aligned with the hole on the ball gland to realize the floating pressing of the ball gland. The technical characteristics are: the ball seat positioning and pressing device with high-precision sliding groove guide rail and inclined surface sliding guide structure is used to realize the positioning and pressing of the ball seat; the ball gland follow-up pressing device with high-precision guide shaft and double guide column type positioning pin structure is used to realize the vertical movement and rotation of the ball gland along the vertical direction. With the removal amount of the ball head grinding tool 4, the ball gland follows the direction of the removal amount to realize the direction follow-up cooperation, so as to ensure the accurate alignment of the inner spherical surface of the ball hinge workpiece and the ball head grinding tool.

[0032] The grinding head driving device, as shown in the attached Figure 6As shown, including servo motor 7.1, gear transmission mechanism, shaft coupling 7.6, tool mounting joint 7.8. The gear transmission mechanism includes the gear ring seat 7.2, the center wheel 7.4, the planetary gear 7.3, the planet carrier 7.5. The gear ring seat is provided with a bottom on the back surface and an inner cavity provided with an inner tooth structure, and a center hole is provided on the bottom of the gear ring seat. The servo motor is fixedly connected with the bottom surface of the gear ring seat, and the output shaft of the servo motor penetrates the center hole on the bottom of the gear ring seat and extends into the inner cavity of the gear ring seat. The center wheel and the planetary gear are arranged in the inner cavity of the gear ring seat, the center wheel is fixedly installed on the output shaft of the servo motor, one end of the planet carrier is rotatably connected with the output shaft of the servo motor, the other end of the planet carrier is rotatably connected with the planetary gear shaft, the planetary gear is fixedly installed on the planetary gear shaft, and the planetary gear is simultaneously engaged with the center wheel and the inner tooth of the gear ring seat. One end of the shaft coupling is connected with the front end of the planetary gear shaft through the universal hinge 7.7, the other end of the shaft coupling is connected with the rear end of the tool mounting joint through the universal hinge, the front end of the tool mounting joint is provided with a socket 7.8.1, and the socket is used for fixedly connecting with the rod body rear end of the ball head tool. According to the specific ball hinge, a plurality of curvature ball head tools can be designed to adapt to the processing of different specifications of the spherical surface of the ball hinge. The ball head tool is driven by the servo motor, and the high-precision shaft coupling and the two universal hinges are adopted to connect between the servo motor and the ball head tool, so that the vibration in the rotation process can be reduced. The ball head tool is embedded with a grinding layer made of diamond or silicon carbide and other wear-resistant materials with high hardness on the surface. The gear structure is arranged between the shaft coupling and the servo motor to realize the rotation of the shaft coupling and the rotation of the ball head tool, so that the rotation of the ball head tool is realized.

[0033] In order to facilitate the installation of the grinding head driving device, the mounting hole on the driving device mounting frame is provided with a mounting hole structure with a slotted upper end 4.4.3, and the width of the slot is greater than the outer diameter of the shaft coupling. The hole diameter of the mounting hole is matched with the outer diameter of the gear ring seat, and two threaded holes 4.4.2 are arranged at the edge of the mounting hole and at the offset position of the slot. Two guide protrusions 7.2.1 are arranged on the outer surface of the gear ring seat and close to the upper part, and a through slot is arranged on the guide protrusion. When the grinding head driving device is installed on the machine body, the two guide protrusions are in contact with the upper end surface of the driving device mounting frame, so that the grinding head driving device is supported on the driving device mounting frame. The through slots on the two guide protrusions are respectively aligned with the two threaded holes at the edge of the mounting hole, and a set of connecting members 7.9 is respectively installed to fix the grinding head driving device on the driving device mounting frame. The connecting member is composed of a universal hinge 7.9.2 and a connecting screw 7.9.1. The lower end of the universal hinge is provided with an external threaded rod, and the upper end is provided with a threaded hole. The universal hinge is connected with the threaded hole on the driving device mounting frame through the external threaded rod, the universal hinge is arranged in the through slot of the corresponding guide protrusion, the connecting screw is connected with the threaded hole at the upper end of the universal hinge and is pressed against the upper end of the guide protrusion. In the present application, the connecting screw is preferably a butterfly screw, which facilitates manual installation and disassembly.

[0034] In order to reduce the vibration in the grinding process, a set of spring damping devices 8 is installed in each damping device mounting hole on the damping device mounting frame, as shown in the figure, and the spring damping device is composed of an outer ring 8.1, an inner ring 8.3 and four sets of damping springs 8.2 arranged between the outer ring and the inner ring. The outer ring adopts a ring body structure with a square outer ring and a circular inner ring, and spring mounting holes are arranged radially at the middle positions of the four sides of the outer ring. The inner ring is a circular ring, and four radial spring positioning pins are uniformly fixed on the outer circumference of the inner ring. The inner ring is embedded in the outer ring in a clearance fit, and the four positioning pins on the inner ring are in one-to-one correspondence with the four spring mounting holes on the outer ring. A damping spring is sleeved on each spring positioning pin, and the outer end of the damping spring extends into the corresponding spring mounting hole. Screw through holes are arranged on the outer ring near the corners of the four sides for fixed installation of the outer ring. The damping device mounting hole is a stepped hole composed of a square hole and a circular hole, and a threaded hole is arranged at the bottom of the square hole near the four corners. The spring damping device is embedded in the square hole, and the spring damping device is fixed in the corresponding damping device mounting hole by installing screws in the four screw through holes and the corresponding threaded holes at the bottom of the square hole. The coupling of the grinding head driving device passes through the inner hole of the corresponding spring damping device. During the workpiece grinding process, the coupling is in contact with the inner ring surface of the inner ring, and the vibration generated by the rotating spindle during the operation of the servo motor can be reduced through the buffering of the four damping springs, which is used to stabilize the vibration of the spindle and the irregular path rotation of the spindle.

[0035] The ball head tool is composed of a spherical grinding head and a rod body. A grinding layer made of wear-resistant materials such as diamond or silicon carbide with high hardness is embedded on the surface of the spherical grinding head, which ensures good wear resistance.

[0036] The liquid supply system, as shown in the attached Figure 3 The liquid supply system is composed of a liquid return tank 5.1, a conveying pump, a precision flow regulator and a conveying pipeline. The liquid return tank is installed at the upper space position in the frame and is composed of an upper recovery funnel and a lower storage tank body. The liquid return tank is provided with a liquid outlet interface, the lower end of the conveying pipeline is connected to the liquid outlet interface, and the upper end extends above the grinding operation position to realize the conveying of the grinding liquid to the grinding operation gap of the ball joint through liquid shower. The conveying pump and the precision flow regulator are connected to the conveying pipeline. The conveying pump provides conveying power, and the precision flow regulator adjusts the flow of the grinding machine in real time through the control system according to the requirements of the processing technology.

[0037] The control system (not shown in the drawings) is arranged outside the entire grinder body, facilitating the operation of the operator. The control panel has various control buttons, indicator lights and display screens. The buttons include start, stop, speed adjustment and other function buttons; the indicator lights are used to display the running status of the equipment, such as power indicator light, fault indicator light, etc.; the display screen can display the running parameters of the equipment, such as rotating speed, temperature, feeding speed, etc. The control system adopts PLC (Programmable Logic Controller) or microprocessor, and the control system accurately controls the position of the workpiece clamping device, the rotating speed of the grinding head, the flow of the grinder, etc. The operator can also perform human-computer interaction operation through the keys or touch screen.

[0038] Although the embodiments of the present application and the drawings are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit of the present application and the appended claims, therefore, the scope of the present application is not limited to the content disclosed in the embodiments and the drawings.

Claims

1. A grinding machine for grinding the inner spherical surface of a ball hinge, characterized in that: Includes the machine body, workpiece clamping device, grinding head drive device, ball head grinding tool, liquid supply system, and control system; The machine body includes a frame, a workpiece clamping device mounting frame, a drive device mounting frame, and a shock absorption device mounting frame; the frame is a cubic frame, and the upper middle space inside the frame is used to install the return tank of the liquid supply system, and an opening is provided at the top of the frame corresponding to the liquid inlet of the return tank. The workpiece clamping device mounting frame is fixed above the frame and consists of a bottom plate and left and right side plates vertically fixed to the upper end of the bottom plate near the rear. Multiple workpiece clamping device mounting positions are arranged along the left and right sides of the bottom plate. Each workpiece clamping device mounting position has a return fluid hole corresponding to and communicating with the opening in the frame. A set of workpiece clamping devices is fixedly installed at each workpiece clamping device mounting position. The drive device mounting frame and the shock absorber mounting frame are installed vertically between the left and right side plates. Multiple mounting holes are arranged on the left and right sides of the drive device mounting frame, and a set of grinding head drive devices is installed at each mounting hole. Multiple buffer device mounting holes are arranged along the left and right sides of the shock absorber mounting frame, and a set of spring shock absorbers is installed in each buffer device mounting hole. The multiple workpiece clamping mounting positions, multiple mounting holes, and multiple buffer device mounting holes correspond one-to-one. The workpiece clamping device comprises a ball seat positioning and pressing mechanism and a ball cover pressing mechanism, used to realize the pressing and fixing of the ball seat and the follow-up pressing of the ball cover; The grinding head drive device includes a servo motor, a gear transmission mechanism, a coupling, and a grinding tool mounting joint. The gear transmission mechanism includes a gear ring seat, a central gear, planetary gears, and a planet carrier. The gear ring seat is fixedly mounted in corresponding mounting holes on the drive device mounting bracket. The gear ring seat has a bottom on its back and internal teeth in its inner cavity, with a central hole at its bottom. The servo motor is fixedly connected to the bottom surface of the gear ring seat, and the output shaft of the servo motor passes through the central hole at the bottom of the gear ring seat and extends into the inner cavity of the gear ring seat. The central gear and planetary gears are located within the inner cavity of the gear ring seat. The center gear is fixedly mounted on the output shaft of the servo motor. One end of the planetary carrier is rotatably connected to the output shaft of the servo motor, and the other end of the planetary carrier is rotatably connected to the planetary gear shaft. The planetary gears are fixedly mounted on the planetary gear shaft, and the planetary gears mesh simultaneously with the internal teeth of the center gear and the gear ring seat. The coupling passes through the inner hole of the spring damping device. One end of the coupling is connected to the front end of the planetary gear shaft via a universal hinge, and the other end of the coupling is connected to the rear end of the grinding tool mounting joint via a universal hinge. The front end of the grinding tool mounting joint is provided with a insertion hole for fixed connection with the rear end of the rod body of the ball head grinding tool. The spring damping device consists of an outer ring, an inner ring, and four sets of damping springs evenly distributed between the outer and inner rings. Screw holes are provided near the four corners of the outer ring. The buffer device mounting hole is a stepped hole composed of square holes and round holes. Threaded holes are provided near the four corners of the bottom of the square holes. The spring damping device is embedded in the square holes. By installing screws in the four screw holes and the corresponding threaded holes at the bottom of the square holes, the spring damping device is fixed in the corresponding buffer device mounting hole. The liquid supply system consists of a return tank, a delivery pump, a precision flow regulator, and a delivery pipeline. The return tank is installed in the upper middle space of the frame and consists of an upper recovery funnel and a lower storage tank. The return tank is equipped with a liquid outlet. The lower end of the delivery pipeline is connected to the liquid outlet, and the upper end extends above the grinding operation position. The grinding liquid is delivered to the grinding operation gap of the ball joint by spraying liquid. The delivery pump and the precision flow regulator are connected to the delivery pipeline.

2. The grinding machine for grinding the inner spherical surface of a ball hinge according to claim 1, characterized in that: The mounting holes on the drive unit mounting bracket adopt a top-grooved mounting hole structure. The width of the groove is greater than the outer diameter of the coupling. The diameter of the mounting hole matches the outer diameter of the gear ring seat. Two threaded holes are provided opposite to the groove at the edge of the mounting hole. Two guide protrusions are provided opposite to each other on the outer surface of the gear ring seat near the upper part. The guide protrusions are provided with through grooves. The two guide protrusions contact the upper end face of the drive unit mounting bracket. The through grooves on the two guide protrusions are aligned with the two threaded holes at the edge of the mounting hole. By installing a set of connectors, the grinding head drive unit is fixed to the drive unit mounting bracket.

3. The grinding machine for grinding the inner spherical surface of a ball hinge according to claim 2, characterized in that: The connector consists of a universal hinge and a connecting screw; the lower end of the universal hinge is provided with an external threaded rod and the upper end is provided with a threaded hole. The universal hinge is connected to the threaded hole on the drive device mounting bracket through the external threaded rod. The universal hinge is inserted into the through groove of the corresponding guide protrusion. The connecting screw is connected to the threaded hole at the upper end of the universal hinge and is pressed against the upper end of the guide protrusion.

4. The grinding machine for grinding the inner spherical surface of a ball hinge according to claim 1, characterized in that: The ball head surface of the ball head grinding tool is inlaid with a grinding layer made of high-hardness diamond or silicon carbide wear-resistant material.

Images