Grinding machine for grinding inner spherical surface of spherical hinge

Abstract

The invention relates to a grinding machine for grinding the inner spherical surface of a spherical hinge. The grinding machine 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, the machine body comprises a frame, a workpiece clamping device mounting rack mounted at the top of the frame, and a driving device mounting rack and a damping device mounting rack which are mounted between two side plates of the workpiece clamping device mounting rack up and down; a liquid return box of the liquid supply system is arranged in the middle-upper space in the frame; a group of workpiece clamping devices are mounted at each workpiece clamping device mounting position on the bottom flat plate of the workpiece clamping device mounting rack; a group of grinding head driving devices are mounted in each mounting hole in the driving device mounting frame in a penetrating manner; a group of spring damping devices is mounted in each buffer device mounting hole in the damping device mounting rack; the grinding head driving device comprises a planetary gear transmission mechanism, a servo motor connected with the input end of the planetary gear transmission mechanism and a coupler connected with the output end of the planetary gear transmission mechanism. The grinding quality and the surface smoothness of the inner spherical surface are improved.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing equipment, and in particular relates to a grinder used for grinding the inner spherical surface of a ball hinge. Background Art

[0002] In the machinery manufacturing industry, the ball hinge is a spherical motion component, which consists of three parts: a ball seat 1, a ball journal 3, and a ball pressure cover 2. The ball journal can rotate freely within a certain range without sticking or moving. Ball hinges are widely used, but traditional grinding equipment cannot meet the high-precision and high-efficiency processing requirements when processing the inner spherical surface of ball hinges due to the limitations of the equipment structure. To this end, a new type of grinding machine for grinding the inner spherical surface of ball hinges is developed to realize automatic grinding of the spherical surface, meet technical requirements, and improve production efficiency. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a grinding machine for grinding the inner spherical surface of a ball hinge, which can improve the grinding quality and surface smoothness of the inner spherical surface.

[0004] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0005] A grinding machine for grinding the inner spherical surface of a ball hinge, comprising 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 frame, a driving device mounting frame and a shock absorbing device mounting frame; the frame is a cubic frame, the middle and upper space in the frame is used to install the return liquid tank of the liquid supply system, and an opening is arranged at the top of the frame corresponding to the liquid inlet position of the return liquid tank;

[0007] 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; a plurality of workpiece clamping device mounting positions are arranged on the left and right sides of the upper edge of the bottom plate, each workpiece clamping device mounting position is provided with a return liquid hole corresponding to the frame opening, and a group of workpiece clamping devices are fixedly installed on each workpiece clamping device mounting position; the driving device mounting frame and the shock absorbing device mounting frame are installed up and down between the left and right side plates, a plurality of mounting holes are arranged on the left and right sides of the driving device mounting frame, and a group of grinding head driving devices are installed at each mounting hole; a plurality of buffer device mounting holes are arranged on the left and right sides of the upper edge of the shock absorbing device mounting frame, and a group of spring shock absorbing devices are installed in each buffer device mounting hole, and the plurality of workpiece clamping mounting positions, the plurality of mounting holes and the plurality of buffer device mounting holes correspond to each other one by one;

[0008] The workpiece clamping device comprises a ball seat positioning and clamping mechanism and a ball pressure cover pressing mechanism, which is used to realize the clamping and fixing of the ball seat and the follow-up clamping of the ball pressure cover;

[0009] The grinding head driving device includes a servo motor, a gear transmission mechanism, a coupling, and a grinding tool mounting joint; the gear transmission mechanism includes a ring gear seat, a center wheel, a planetary wheel, and a planetary carrier, and the ring gear seat is fixed in the corresponding mounting hole on the driving device mounting frame; the ring gear seat is a structure with a bottom on the back and internal teeth in the inner cavity, and a center hole is provided at the bottom of the ring gear seat; the servo motor is fixedly connected to the bottom surface of the ring gear seat, and the output shaft of the servo motor passes through the center hole on the bottom of the ring gear seat and extends into the inner cavity of the ring gear seat; the center wheel and the planetary wheel are arranged in the inner cavity of the ring gear seat, The center wheel 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 wheel shaft. The planetary wheel is fixedly mounted on the planetary wheel shaft, and the planetary wheel is meshed with the inner teeth of the center wheel and the ring gear seat at the same time; the coupling passes through the inner hole of the spring shock absorber, one end of the coupling is connected to the front end of the planetary wheel shaft through a universal hinge, and the other end of the coupling is connected to the rear end of the grinding tool mounting joint through a universal hinge, and the front end of the grinding tool mounting joint is provided with a socket for fixed connection with the rear end of the rod body of the ball head grinding tool.

[0010] Moreover, the mounting hole on the drive device mounting frame adopts a mounting hole structure with a slot at the upper end, the width of the slot is larger than the outer diameter of the coupling, the aperture of the mounting hole matches the outer diameter of the gear ring seat, and two threaded holes are relatively arranged at the edge of the mounting hole and staggered positions with the slot; two guide protrusions are relatively arranged at positions close to the upper part of the outer surface of the gear ring seat, and the guide protrusions are provided with over-slots; the two guide protrusions are in contact with the upper end surface of the drive device mounting frame, and the over-slots on the two guide protrusions are respectively aligned with the two threaded holes at the edge of the mounting hole, and the grinding head drive device is fixed to the drive device mounting frame by respectively installing a set of connecting parts.

[0011] Moreover, the connecting part is composed 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 driving device mounting frame through the external threaded rod, the universal hinge is installed in the groove corresponding to the 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.

[0012] Moreover, the spring shock absorber device is composed of an outer ring, an inner ring and four groups of shock absorbing springs evenly distributed and embedded between the outer ring and the inner ring. Screw holes are arranged on the outer ring near the four corners; the buffer device mounting hole is a stepped hole composed of a square hole and a round hole, and threaded holes are arranged at the bottom of the square hole near the four corners. The spring shock absorber device is embedded in the square hole, and the spring shock absorber device is fixed in the corresponding buffer device mounting hole by installing screws in the four screw holes and the corresponding threaded holes at the bottom of the square hole.

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

[0014] Moreover, the liquid supply system consists of a return liquid tank, a delivery pump, a precision flow regulator and a delivery pipeline; the return liquid tank is installed in the middle and upper space position within the frame, and is composed of an upper recovery funnel and a lower storage box; the return liquid tank is provided with a liquid outlet interface, the lower end of the delivery pipeline is connected to the liquid outlet interface, and the upper end extends to above the grinding operation position, and the grinding liquid is delivered to the grinding operation gap of the ball joint by spraying; the delivery pump and the precision flow regulator are connected to the delivery pipeline.

[0015] The advantages and positive effects of the present invention are:

[0016] 1. The present invention fixes the ball seat through a workpiece clamping device, and the ball cover is pressed on the top of the ball seat in a manner that it can move up and down and can be rotated and adjusted in the plane direction, thereby realizing the self-adaptation of the spherical surface matching of the ball hinge during the grinding process.

[0017] 2. The grinding head driving device of the present invention 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 hinge in multiple aspects, realize high-precision processing of complex curved surfaces, and improve the grinding quality and surface smoothness of the inner spherical surface.

[0018] 3. In the present invention, a slot is provided on the upper edge of the mounting hole on the drive device mounting frame, and the slot is used for the coupling to pass through, so that the overall disassembly and installation of the grinding head drive device can be easily realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a ball hinge assembly involved in the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of a grinding machine used for grinding the inner spherical surface of a ball hinge according to the present invention;

[0021] Figure 3 It is a three-dimensional exploded view of a grinding machine used for grinding the inner spherical surface of a ball hinge according to the present invention;

[0022] Figure 4 It is a three-dimensional assembly diagram of the body of the grinding machine used for grinding the inner spherical surface of the ball hinge of the present invention;

[0023] Figure 5 5a is a schematic diagram of the structure of the workpiece clamping device in the grinding machine used for grinding the inner spherical surface of the ball hinge according to the present invention; 5b is a three-dimensional diagram without the bottom shell Figure 1 ; 5c, remove the bottom shell of the three-dimensional Figure 2;

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

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

[0026] Figure 8 yes Figure 7 Schematic diagram of the structure of the connecting parts;

[0027] Fig. 9 It is a structural schematic diagram of the shock absorbing device of the present invention. DETAILED DESCRIPTION

[0028] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0029] A grinding machine for grinding the inner spherical surface of a ball hinge, such as Figure 1-Figure 9 As shown, it mainly includes 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 body, as attached Figure 3 and attached Figure 4As shown, it mainly includes: frame 4.1, workpiece clamping device mounting frame 4.2, drive device mounting frame 4.4, and shock absorber mounting frame 4.3. The frame adopts a solid metal frame as the main structure, made of aluminum alloy, and the frame shape is a cube, providing stable support. The outer shell covers the outside of the frame, plays the role of protecting the parts of the internal liquid supply system and preventing dust. The outer shell material is a thin steel plate. The surface is spray-painted to improve corrosion resistance and aesthetics. The middle and upper space 4.1.2 in the frame is used to install the return liquid tank of the liquid supply system, and an opening 4.1.1 is provided at the top of the frame corresponding to the liquid inlet of the return liquid tank. The workpiece clamping device mounting frame is fixed on the top of 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 near the rear. A plurality of workpiece clamping device mounting positions are arranged on the left and right sides of the bottom plate, and each workpiece clamping device mounting position is provided with a return liquid hole 4.2.1 corresponding to the frame opening, and the return liquid hole is opened in the direction shown in the attached figure. Each workpiece clamping device installation position can be installed with a set of workpiece clamping devices. In this embodiment, three sets of workpiece clamping devices are set. Positioning reference surfaces and threaded holes are set on the bottom plate to ensure that the workpiece clamping devices can be firmly fixed on the frame and will not loosen during the grinding rotation vibration process. The drive device mounting frame and the shock absorbing device mounting frame are installed up and down between the left and right side plates. A plurality of mounting holes 4.4.1 are set on the left and right sides of the drive device mounting frame, and a plurality of buffer device mounting holes are set on the left and right sides of the shock absorbing device mounting frame. The multiple workpiece clamping installation positions, the multiple mounting holes and the multiple buffer device mounting holes correspond to each other one by one.

[0031] The workpiece clamping device is used to realize the pressing and fixing of the ball seat and the follow-up pressing of the ball cover. Figure 5As shown, the device has been disclosed in the invention patent application with application number: 2022109503424, entitled: A clamping device for grinding ball hinges, and mainly includes a ball seat positioning clamping mechanism and a ball pressure cover pressing mechanism. The ball seat fixing clamping mechanism is composed of a wedge-shaped matching structure arranged on one side and an elastic top-pressing structure 6.5 arranged on the other side. The wedge-shaped matching structure is composed of a wedge block 6.6 and a wedge-shaped surface arranged on the base. The upper end of the wedge block is connected to the guide rod 6.2, and the guide rod is connected to the iron core of the electromagnetic assembly 6.1. The wedge block is driven downward by the elongation of the iron core. The wedge block cooperates with the wedge surface to push the ball seat to move in the direction of the elastic top-pressing structure to achieve the clamping of the ball seat. The ball pressure cover pressing mechanism adopts a combination structure of a guide sleeve 6.3 and a positioning pin 6.4 fixed on the guide sleeve. The guide sleeve is arranged on the guide rod in a manner that it can move up and down and rotate in the horizontal direction. The positioning pin is aligned with the hole on the ball pressure cover to achieve floating clamping of the ball pressure cover. Its technical features are: the ball seat positioning and clamping is achieved through a high-precision sliding groove guide rail and a ball seat positioning and clamping device with an inclined sliding guide structure; the vertical movement and vertical rotation of the ball cover are achieved through a high-precision guide shaft and a ball cover follow-up clamping device with a double guide column positioning pin structure, and the ball cover is followed in the direction of the removal amount as the ball head grinder 4 grinds and removes the amount, so as to ensure that the inner spherical surface of the ball hinge workpiece is accurately aligned with the ball head grinder.

[0032] The grinding head driving device, as shown in the attached Figure 6As shown, it includes a servo motor 7.1, a gear transmission mechanism, a coupling 7.6, and a grinding tool mounting joint 7.8. The gear transmission mechanism includes a ring gear seat 7.2, a center wheel 7.4, a planetary wheel 7.3, and a planetary carrier 7.5. The ring gear seat is a structure with a bottom on the back and internal teeth in the inner cavity, and a center hole is provided at the bottom of the ring gear seat. The servo motor is fixedly connected to the bottom surface of the ring gear seat, and the output shaft of the servo motor passes through the center hole on the bottom of the ring gear seat and extends into the inner cavity of the ring gear seat. The center wheel and the planetary wheels are arranged in the inner cavity of the ring gear seat, and the center wheel is fixedly installed 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 wheel shaft. The planetary wheels are fixedly installed on the planetary wheel shaft, and the planetary wheels are meshed with the inner teeth of the center wheel and the ring gear seat at the same time. One end of the coupling is connected to the front end of the planetary gear shaft through a universal hinge 7.7, and the other end of the coupling is connected to 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 7.8.1 for fixed connection with the rear end of the rod body of the ball head grinding tool. According to the specific grinding ball hinge, ball head grinding tools with various curvatures can be designed to adapt to the inner spherical surface processing of ball hinges of different specifications. The ball head grinding tool is driven by a servo motor. The servo motor and the ball head grinding tool are connected by a high-precision coupling and two universal hinges to reduce vibration during rotation. A grinding layer made of wear-resistant materials such as diamond or silicon carbide with high hardness is inlaid on the surface of the ball head grinding tool. A gear structure is arranged between the coupling and the servo motor to realize the self-rotation and rotation of the coupling, thereby realizing the self-rotation and rotation of the ball head grinding tool.

[0033] In order to facilitate the installation of the grinding head drive device, the mounting hole on the above-mentioned drive device mounting frame adopts a mounting hole structure with a slot 4.4.3 at the upper end, and the width of the slot is greater than the outer diameter of the coupling. The aperture of the mounting hole matches 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 staggered positions relative to the slot. Two guide protrusions 7.2.1 are arranged relatively near the upper part of the outer surface of the gear ring seat, and the guide protrusions are provided with over-grooves. When the grinding head drive device is installed on the machine body, the two guide protrusions contact the upper end surface of the drive device mounting frame, so that the grinding head drive device is supported as a whole on the drive device mounting frame. The over-grooves on the two guide protrusions are aligned with the two threaded holes at the edge of the mounting hole respectively, and by installing a set of connecting pieces 7.9 respectively, the grinding head drive device is fixed to the drive device mounting frame. The above-mentioned connecting piece 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 externally threaded rod and the upper end is provided with a threaded hole. The universal hinge is connected to the threaded hole on the driving device mounting frame through the externally threaded rod. The universal hinge is installed in the corresponding groove of the 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. In the present invention, the connecting screw is preferably a butterfly screw, which is convenient for manual installation and disassembly.

[0034] In order to reduce the vibration during the grinding process, a set of spring shock absorbing devices 8 is installed in each buffer device mounting hole on the shock absorbing device mounting frame. Referring to the figure, the spring shock absorbing device is composed of an outer ring 8.1, an inner ring 8.3 and four groups of shock absorbing 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. Spring mounting holes are radially arranged in the middle of the four sides of the outer ring. The inner ring is a circular ring, and four radial spring locating pins are evenly distributed and fixed on the circumference of the outer ring of the inner ring. The inner ring is embedded in the outer ring in a clearance fit manner. The four locating pins on the inner ring are aligned one by one with the four spring mounting holes on the outer ring. A shock absorbing spring is mounted on each spring locating pin, and the outer end of the shock absorbing spring extends into the corresponding spring mounting hole. Screw holes are arranged near the four corners of the outer ring to achieve fixed installation of the outer ring. The buffer device installation hole is a stepped hole composed of a square hole and a round hole, and a threaded hole is provided 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 buffer device installation hole by installing screws in the four screw holes and the corresponding threaded holes at the bottom of the square hole. The coupling of the grinding head drive device passes through the inner hole of the corresponding spring damping device. During the grinding process of the workpiece, the coupling contacts the inner ring surface of the inner ring. The buffering of the four damping springs can reduce the vibration generated by the rotating spindle when the servo motor is running, which is used to stabilize the vibration of the spindle and the rotation of the irregular path generated by the spindle.

[0035] The ball-end grinder 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 inlaid on the surface of the spherical grinding head 4 to ensure good wear resistance.

[0036] The liquid supply system, as attached Figure 3 As shown, the liquid supply system consists of a liquid return tank 5.1, a delivery pump, a precision flow regulator and a delivery pipeline. The liquid return tank is installed in the middle and upper space of the frame, and is composed of an upper recovery funnel and a lower storage box. The liquid return tank is provided with a liquid outlet interface, the lower end of the delivery pipeline is connected to the liquid outlet interface, and the upper end extends to the top of the grinding operation position, and the grinding liquid is delivered to the grinding operation gap of the ball joint by spraying. The delivery pump and the precision flow regulator are connected to the delivery pipeline, and the delivery pump provides delivery power. According to the requirements of the processing technology, the precision flow regulator adjusts the flow of the grinder in real time through the control system.

[0037] The control system (not shown in the attached figure) is arranged outside the entire grinding machine body, which is convenient for the operator to operate. There are various control buttons, indicator lights and display screens on the control panel. The buttons include function buttons such as start, stop, and speed regulation; the indicator lights are used to display the operating status of the equipment, such as power indicator lights, fault indicator lights, etc.; the display screen can display the operating parameters of the equipment, such as speed, temperature, feed 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 speed of the grinding head, the flow rate of the grinder, etc. The operator can also perform human-computer interaction through buttons or touch screens.

[0038] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A grinding machine for grinding the inner spherical surface of a ball hinge, characterized in that: It includes 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; The machine body comprises a frame, a workpiece clamping device mounting frame, a driving device mounting frame and a shock absorbing device mounting frame; the frame is a cubic frame, the middle and upper space in the frame is used to install the return liquid tank of the liquid supply system, and an opening is arranged at the top of the frame corresponding to the liquid inlet position of the return liquid 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; a plurality of workpiece clamping device mounting positions are arranged on the left and right sides of the upper edge of the bottom plate, each workpiece clamping device mounting position is provided with a return liquid hole corresponding to the frame opening, and a group of workpiece clamping devices are fixedly installed on each workpiece clamping device mounting position; the driving device mounting frame and the shock absorbing device mounting frame are installed up and down between the left and right side plates, a plurality of mounting holes are arranged on the driving device mounting frame on the left and right sides, and a group of grinding head driving devices are installed at each mounting hole; a plurality of buffer device mounting holes are arranged on the left and right sides of the upper edge of the shock absorbing device mounting frame, and a group of spring shock absorbing devices are installed in each buffer device mounting hole, and the plurality of workpiece clamping mounting positions, the plurality of mounting holes and the plurality of buffer device mounting holes correspond to each other one by one; The workpiece clamping device comprises a ball seat positioning and clamping mechanism and a ball pressure cover pressing mechanism, which is used to realize the clamping and fixing of the ball seat and the follow-up clamping of the ball pressure cover; The grinding head driving device includes a servo motor, a gear transmission mechanism, a coupling, and a grinding tool mounting joint; the gear transmission mechanism includes a ring gear seat, a center wheel, a planetary wheel, and a planetary carrier, and the ring gear seat is fixed in the corresponding mounting hole on the driving device mounting frame; the ring gear seat is a structure with a bottom on the back and internal teeth in the inner cavity, and a center hole is provided at the bottom of the ring gear seat; the servo motor is fixedly connected to the bottom surface of the ring gear seat, and the output shaft of the servo motor passes through the center hole on the bottom of the ring gear seat and extends into the inner cavity of the ring gear seat; the center wheel and the planetary wheel are arranged in the inner cavity of the ring gear seat, The center wheel 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 wheel shaft. The planetary wheel is fixedly mounted on the planetary wheel shaft, and the planetary wheel is meshed with the inner teeth of the center wheel and the ring gear seat at the same time; the coupling passes through the inner hole of the spring shock absorber, one end of the coupling is connected to the front end of the planetary wheel shaft through a universal hinge, and the other end of the coupling is connected to the rear end of the grinding tool mounting joint through a universal hinge, and the front end of the grinding tool mounting joint is provided with a socket for fixed connection with the rear end of the rod body of the ball head grinding tool.

2. The grinding machine for grinding the inner spherical surface of a ball hinge according to claim 1, characterized in that: The mounting hole on the drive device mounting frame adopts a mounting hole structure with a slot at the upper end, the width of the slot is larger than the outer diameter of the coupling, the aperture of the mounting hole matches the outer diameter of the gear ring seat, and two threaded holes are relatively arranged at the edge of the mounting hole and staggered positions with the slot; two guide protrusions are relatively arranged at positions close to the upper part of the outer surface of the gear ring seat, and the guide protrusions are provided with over-slots; the two guide protrusions are in contact with the upper end surface of the drive device mounting frame, and the over-slots on the two guide protrusions are respectively aligned with the two threaded holes at the edge of the mounting hole, and the grinding head drive device is fixed to the drive device mounting frame by respectively installing a set of connecting parts.

3. The grinding machine for grinding the inner spherical surface of a ball hinge according to claim 2, characterized in that: The connecting piece is composed 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 driving device mounting frame through the external threaded rod, the universal hinge is installed in the corresponding guide protrusion through the groove, 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 spring shock absorbing device is composed of an outer ring, an inner ring and four groups of shock absorbing springs evenly distributed and embedded between the outer ring and the inner ring. Screw holes are arranged near the four corners on the outer ring; the buffer device mounting hole is a stepped hole composed of a square hole and a round hole, and threaded holes are arranged at the bottom of the square hole near the four corners. The spring shock absorbing device is embedded in the square hole, and the spring shock absorbing device is fixed in the corresponding buffer device mounting hole by installing screws in the four screw holes and the corresponding threaded holes at the bottom of the square hole.

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

6. The grinding machine for grinding the inner spherical surface of a ball hinge according to claim 1, characterized in that: The liquid supply system consists of a return liquid tank, a delivery pump, a precision flow regulator and a delivery pipeline; the return liquid tank is installed in the middle and upper space position within the frame, and is composed of an upper recovery funnel and a lower storage box; the return liquid tank is provided with a liquid outlet interface, the lower end of the delivery pipeline is connected to the liquid outlet interface, and the upper end extends to the top of the grinding operation position, and the grinding liquid is delivered to the grinding operation gap of the ball joint by spraying; the delivery pump and the precision flow regulator are connected to the delivery pipeline.

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