Exchange table type grinding machine

Abstract

The utility model discloses an exchange table type grinding machine which comprises a machine base, a Y-axis moving mechanism, a Z-axis moving mechanism, an abrasive belt grinding head, an exchange table, an exchange driving device, an autorotation power shaft closing device, an autorotation power device and two sets of clamping autorotation mechanisms. The two sets of clamping and rotating mechanisms are arranged on the exchange table to form two independent clamping stations, when one set of clamping and rotating mechanism drives handle workpieces to be polished, the other set of clamping and rotating mechanism can be unloaded and loaded at the same time, and therefore the idle time of a production line is shortened to the maximum extent. When one group of clamping autorotation mechanisms completes a round of polishing, the exchange driving device drives the exchange table to rotate to the feeding and discharging station, and meanwhile, the other group of clamping autorotation mechanisms correspondingly rotate to the polishing station to start a new round of polishing, so that the whole polishing production process can be carried out seamlessly, interruption and pause are avoided, and the production efficiency is improved. Alternate grinding machining of handle workpieces is achieved, the equipment utilization rate is increased, and the working efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding and polishing, in particular to an exchange table type grinding machine. Background Art

[0002] In the processing of daily hardware parts, it is often necessary to polish some parts. To improve the polishing effect, many polishing machines have been introduced on the market. However, for the polishing of parts with different shapes, special polishing machines need to be developed.

[0003] For polishing handle parts, for example, the utility model patent with the publication number "CN217493768U" and the name "Handle Polishing Equipment" discloses a handle polishing equipment, which includes a machine base, a handle grinding mechanism, a tool clamping mechanism, a displacement detection mechanism and a first rotation mechanism. The handle grinding mechanism is arranged on the machine base and can move in the vertical direction. It includes a first mounting plate and a sand belt grinding assembly connected to the first mounting plate; the tool clamping mechanism is located on one side of the handle grinding mechanism. The tool clamping mechanism includes at least one first clamping member for placing the tool to be processed and a second clamping member for placing the standard tool. Both the first clamping member and the second clamping member can move towards or away from the handle grinding mechanism, and the second clamping member can also rotate around the axis in the horizontal direction; the displacement detection mechanism is arranged in the vertical direction and corresponds to the position of the second clamping member. The displacement detection mechanism includes a detection head and a detection member, and the detection member is used to detect the displacement of the detection head moving in the vertical direction. The first rotation mechanism includes a cross plate and two vertical plates. The two vertical plates are arranged at intervals and are respectively connected to the cross plate. A rotating plate is rotatably connected between the two vertical plates. One end of the rotating plate is connected to a first motor for driving the rotating plate to rotate around the axis in the horizontal direction. At least one of the first clamping members and the second clamping member are arranged at intervals on the rotating plate. Since the handle grinding mechanism is fixed and cannot tilt and rotate, but the first motor is used to drive the rotating plate to rotate around the axis in the horizontal direction to realize the up and down swing of the handle. Although the handle can be ground in this way, after grinding a group of handles, it is necessary to stop the machine to remove the ground handles, and then replace the handles to be ground. During this replacement process, the machine stops working, and there is a long waiting time before the next batch of grinding can be carried out, resulting in a lot of idle time on the production line and low production efficiency. Summary of the Utility Model

[0004] Aiming at the above deficiencies, the purpose of the present utility model is to provide an exchange table type grinding machine with reasonable structure design and high working efficiency.

[0005] To achieve the above purpose, the technical solution provided by the present utility model is:

[0006] An exchange table type grinding machine, which comprises a machine base, a Y-axis moving mechanism, a Z-axis moving mechanism, a sand belt grinding head, an exchange table, an exchange driving device, a self-rotation power coupling device, a self-rotation power device and two clamping and self-rotation mechanisms. The Z-axis moving mechanism is arranged on the machine base through the Y-axis moving mechanism and is driven by the Y-axis moving mechanism to make a reciprocating motion in the Y-axis direction. The sand belt grinding head is arranged on the Z-axis moving mechanism and is driven by it to make a reciprocating motion in the Z-axis direction. The exchange driving device is arranged on the machine base corresponding to the front position of the Y-axis moving mechanism. The exchange table is arranged on the exchange driving device and is driven by the exchange driving device to make a rotating motion. The two clamping and self-rotation mechanisms are arranged side by side on the exchange table. The self-rotation power device is arranged on the machine base through the self-rotation power coupling device and is driven by the self-rotation power coupling device to be connected with one of the clamping and self-rotation mechanisms.

[0007] As a preferred solution of the present utility model, the exchange driving device comprises a base, a reduction motor and a cam divider. The cam divider is arranged on the machine base through the base. The reduction motor is arranged on the machine base corresponding to one side position of the base. The reduction motor drives the cam divider through a belt transmission assembly, and the cam divider drives the exchange table to rotate 180 degrees.

[0008] As a preferred solution of the present utility model, the self-rotation power coupling device comprises a bracket, a lifting cylinder, a connecting rod and a linkage seat. The linkage seat is arranged on one side wall of the bracket through a linear slide rail assembly. The lifting cylinder is arranged on the other side wall of the bracket. One end of the connecting rod is fixed to the linkage seat, and the other end is fixed to the piston rod of the lifting cylinder. The linkage seat makes a lifting motion by the telescopic movement of the piston rod of the lifting cylinder.

[0009] As a preferred solution of the present utility model, the self-rotation power device comprises a servo motor and a lower docking shaft. The servo motor is arranged on the linkage seat. One end of the lower docking shaft is arranged on the driving shaft of the servo motor, and the other side is vertically oriented and is provided with lower docking teeth. The servo motor drives the lower docking shaft to rotate.

[0010] As a preferred solution of the present utility model, the clamping and self-rotation mechanism comprises an RV reducer, a vertical plate, a self-rotation jig and an upper docking shaft. The vertical plate is vertically arranged on the exchange table. A plurality of self-rotation jigs are arranged side by side on the vertical plate. The RV reducer is arranged at one end of the vertical plate. The output shaft of the RV reducer is connected with all the self-rotation jigs through a synchronous belt assembly. The input shaft of the RV reducer faces downward. The upper end of the upper docking shaft is arranged on the input shaft of the RV reducer, and the lower end extends vertically downward and is provided with upper docking teeth adapted to the lower docking teeth. The power transmission between the lower docking shaft and the upper docking shaft is realized by the docking and meshing of the lower docking teeth and the upper docking teeth.

[0011] As a preferred solution of the present utility model, a docking through hole for the lower docking shaft to pass through is provided at the position of the switching table corresponding to the upper docking shaft, facilitating the docking of the lower docking shaft and the upper docking shaft through the docking through hole.

[0012] As a preferred solution of the present utility model, the self-rotating jig includes a self-rotating sleeve seat, a self-rotating shaft, and a workpiece jig. The self-rotating shaft is arranged on the self-rotating sleeve seat through two tapered roller bearings, and the workpiece jig is arranged at the front end of the self-rotating shaft, suitable for clamping and grinding various handle-type workpieces.

[0013] As a preferred solution of the present utility model, the synchronous belt assembly includes a driving synchronous pulley, a driven synchronous pulley, a synchronous guide pulley, a tensioning synchronous pulley, a support plate, a tensioning eccentric disc, and a synchronous belt. The driving synchronous pulley is arranged on the output shaft of the RV reducer, the driven synchronous pulley is arranged at the tail end of the self-rotating shaft, the tensioning eccentric disc is arranged on the switching table through the support plate, the tensioning synchronous pulley is arranged on the eccentric shaft of the tensioning eccentric disc, the synchronous guide pulley is arranged on the vertical plate corresponding to the position between two adjacent driven synchronous pulleys, and the synchronous belt bypasses the driving synchronous pulley, the driven synchronous pulley, the synchronous guide pulley, and the tensioning synchronous pulley to achieve synchronous rotation.

[0014] As a preferred solution of the present utility model, the abrasive belt grinding head includes an electric cylinder driving device, a lifting seat, an extension arm, a rotating seat, and an abrasive belt grinding assembly. The lifting seat is arranged on the Z-axis moving mechanism, the abrasive belt grinding assembly is arranged on the front surface of the rotating seat, one end of the extension arm is fixed on the lifting seat, and the other end extends to the front surface of the rotating seat and is hinged on the rotating seat through a hinge shaft. The axis of the hinge shaft is aligned with the center line of the abrasive belt of the abrasive belt grinding assembly; the electric cylinder driving device is arranged on the lifting seat and can drive the rotating seat to rotate around the hinge shaft.

[0015] As a preferred solution of the present utility model, the abrasive belt grinding assembly includes a grinding motor, a driving pulley, a driven pulley, an abrasive belt adjusting device, and a plurality of grinding pressure wheels. The plurality of grinding pressure wheels are arranged side by side at intervals at the lower edge position of the rotating seat. The grinding motor is arranged on one side of the rotating seat, the driving pulley is arranged on the driving shaft of the grinding motor, the driven pulley is arranged on the other side of the rotating seat through the abrasive belt adjusting device, and the abrasive belt bypasses the driving pulley, the driven pulley, and the grinding pressure wheels.

[0016] The beneficial effects of the present utility model are as follows: The structure of the present utility model is reasonably designed. There are two sets of clamping and self-rotating mechanisms provided on the exchange table, forming two independent clamping stations. When one set of clamping and self-rotating mechanisms drives the handle-shaped workpiece to be polished, the unloading and loading of the other set of clamping and self-rotating mechanisms can be carried out simultaneously, which minimizes the idle time of the production line to the greatest extent. When one set of clamping and self-rotating mechanisms completes one round of polishing, the exchange driving device drives the exchange table to rotate and turn it to the loading and unloading station, while at the same time the other set of clamping and self-rotating mechanisms correspondingly turns to the polishing station and starts a new round of polishing. In this way, the entire polishing production process can proceed seamlessly, avoiding interruptions and pauses, realizing the alternating polishing processing of the handle-shaped workpiece, and improving the equipment utilization rate and production efficiency. In addition, the overall structure is simple, easy to implement, and conducive to wide popularization and application.

[0017] The following further describes the present utility model in conjunction with the accompanying drawings and embodiments. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0019] Figure 2 is a structural schematic diagram of the sand belt grinding head in the present utility model.

[0020] Figure 3 is a structural schematic diagram of the exchange driving device in the present utility model.

[0021] Figure 4 is a structural schematic diagram of the clamping and self-rotating mechanism in the present utility model.

[0022] Figure 5 is a structural schematic diagram of the self-rotating power coaxial device in the present utility model. Specific Embodiments

[0023] Embodiment, refer to Figures 1 to 5 In this embodiment, an exchange table type grinding machine is provided, which includes a machine base 1, a Y-axis moving mechanism 2, a Z-axis moving mechanism 3, a sand belt grinding head 4, an exchange table 5, an exchange driving device 6, a self-rotating power coaxial device 7, a self-rotating power device 8, and two sets of clamping and self-rotating mechanisms 9.

[0024] The Z-axis moving mechanism 3 is arranged on the machine base 1 through the Y-axis moving mechanism 2 and is driven by the Y-axis moving mechanism 2 to make a reciprocating motion in the Y-axis direction. The belt grinding head 4 is arranged on the Z-axis moving mechanism 3 and is driven by it to make a reciprocating motion in the Z-axis direction. Specifically, the belt grinding head 4 includes an electric cylinder driving device 41, a lifting seat 42, an extension arm 43, a rotating seat 44 and a belt grinding assembly 45. The lifting seat 42 is arranged on the Z-axis moving mechanism 3. The belt grinding assembly 45 is arranged on the front of the rotating seat 44. One end of the extension arm 43 is fixed on the lifting seat 42, and the other end extends to the front of the rotating seat 44 and is hinged on the rotating seat 44 through a hinge shaft. Preferably, a long hole for the extension arm 43 to pass through is provided on the rotating seat 44, and a hinge seat is provided at each of the two positions corresponding to the two sides of the long hole. The two ends of the hinge shaft are arranged on the hinge seats. The other end of the extension arm 43 passes through the long hole and is arranged on the hinge shaft. The axis of the hinge shaft is aligned with the center line of the belt of the belt grinding head 4. In a traditional grinding machine, since the position of the handle-shaped workpiece is far from its swing axis, the swing amplitude of the handle-shaped workpiece up and down is large, so the handle grinding mechanism needs to make large-stroke lifting actions frequently to achieve the grinding purpose, which correspondingly increases the loss of the Z-axis moving mechanism 3 and shortens its service life. Moreover, the large-stroke lifting action also consumes more time and has low working efficiency. In the present utility model, since the rotation axis of the rotating seat 44 is aligned with the center line of the belt of the belt grinding head 4, only the electric cylinder driving device 41 needs to drive the rotating seat 44 to make a rotational swing to meet the grinding requirements of the handle-shaped workpiece, avoiding the problem that the traditional handle-shaped workpiece needs to make a large swing up and down, effectively shortening the lifting stroke distance of the Z-axis moving mechanism 3, reducing the loss, and further improving the working efficiency.

[0025] The electric cylinder driving device 41 is arranged on the lifting seat 42 and can drive the rotating seat 44 to rotate with the hinge shaft as the axis. Specifically, mounting plates are provided on both sides of the lifting seat 42, and rear vertical bearing seats are provided on the mounting plates. A front vertical bearing seat is provided on the back of the rotating seat 44 corresponding to the position of the rear vertical bearing seat. One end of the electric cylinder driving device 41 is arranged on the rear vertical bearing seat through a rear rotating shaft, and the other end of the electric cylinder driving device 41 is arranged on the front vertical bearing seat through a front rotating shaft. Using the electric cylinder driving device 41 to drive the rotating seat 44 to rotate, the rotation is stable, improving the reliability and stability of the equipment operation and ensuring the grinding effect.

[0026] The abrasive belt grinding assembly 45 includes a grinding motor, a driving pulley, a driven pulley, an abrasive belt adjusting device, and a plurality of grinding pressure wheels. The plurality of grinding pressure wheels are arranged side by side at intervals at the lower edge position of the turntable 44. Preferably, an arc-shaped concave position is provided on the turntable 44 corresponding to the position between two adjacent grinding pressure wheels, and the handle-shaped workpiece can be avoided through the arc-shaped concave position, which is more conducive to the grinding process. The abrasive belt part wound between two adjacent grinding pressure wheels is used for grinding and has a certain elasticity. The grinding motor is arranged on one side of the turntable 44, the driving pulley is arranged on the driving shaft of the grinding motor, and the driven pulley is arranged on the other side of the turntable 44 through the abrasive belt adjusting device. Specifically, the abrasive belt adjusting device includes a cylinder seat, a tensioning cylinder, a rotating bearing, a wheel frame, a mounting seat, and an adjusting handle. The tensioning cylinder is installed on the turntable 44 through the cylinder seat, the mounting seat is arranged on the piston rod of the tensioning cylinder, an assembly cavity adapted to the outer shape of the rotating bearing is provided on the back surface of the wheel frame, the rotating bearing is fixed in the assembly cavity, a mounting shaft installed in the inner ring of the rotating bearing is provided on the front surface of the mounting seat, and the two adjusting handles are symmetrically arranged on both sides of the wheel frame and can press against the top surfaces on both sides of the mounting seat. The driven pulley is arranged on the wheel frame. The position of the driven pulley is adjusted by the telescopic movement of the tensioning cylinder to achieve the purpose of adjusting the tension of the abrasive belt. The rotation angle of the wheel frame is adjusted through the adjusting handle to adjust the deflection angle of the driven pulley, so as to realize the deviation adjustment of the abrasive belt. During operation, the abrasive belt winds around the driving pulley, the driven pulley, and the grinding pressure wheels. The grinding motor drives the driving pulley, and drives the driven pulley and the grinding pressure wheels through the abrasive belt to achieve the purpose of grinding.

[0027] The exchange driving device 6 is arranged on the machine base 1 corresponding to the front position of the Y-axis moving mechanism 2. The exchange table 5 is arranged on the exchange driving device 6 and is driven by the exchange driving device 6 to perform a rotating action. Specifically, the exchange driving device 6 includes a base 61, a reduction motor 62, and a cam divider 63. The cam divider 63 is arranged on the machine base 1 through the base 61, the reduction motor 62 is arranged on the machine base 1 corresponding to one side position of the base 61, the reduction motor 62 drives the cam divider 63 through a belt transmission assembly, and the cam divider 63 drives the exchange table 5 to rotate 180 degrees.

[0028] Two clamping and self-rotating mechanisms 9 are arranged side by side on the exchange table 5. The self-rotating power device 8 is arranged on the machine base 1 through a self-rotating power coaxial device 7 and is connected to one of the clamping and self-rotating mechanisms 9 under the drive of the self-rotating power coaxial device 7. The self-rotating power coaxial device 7 includes a bracket 71, a lifting cylinder 72, a connecting rod 73 and a linkage seat 74. The linkage seat 74 is arranged on one side wall of the bracket 71 through a linear slide rail assembly 75. The lifting cylinder 72 is arranged on the other side wall of the bracket 71. One end of the connecting rod 73 is fixed to the linkage seat 74, and the other end is fixed to the piston rod of the lifting cylinder 72. The lifting and lowering action of the linkage seat 74 is driven by the telescopic movement of the piston rod of the lifting cylinder 72.

[0029] The self-rotating power device 8 includes a servo motor 81 and a lower docking shaft 82. The servo motor 81 is arranged on the linkage seat 74. One end of the lower docking shaft 82 is arranged on the drive shaft of the servo motor 81, and the other side is vertically oriented and provided with lower docking teeth. The lower docking shaft 82 is driven to rotate by the servo motor 81.

[0030] The clamping and self-rotating mechanism 9 includes an RV reducer 91, a vertical plate 92, a self-rotating jig 93 and an upper docking shaft 94. The vertical plate 92 is vertically arranged on the exchange table 5. A plurality of self-rotating jigs 93 are arranged side by side on the vertical plate 92. The self-rotating jig 93 includes a self-rotating sleeve seat, a self-rotating shaft and a workpiece jig. The self-rotating shaft is arranged on the self-rotating sleeve seat through two tapered roller bearings. The workpiece jig is arranged at the front end of the self-rotating shaft and is suitable for clamping and grinding various shank-type workpieces.

[0031] The RV reducer 91 is arranged at one end of the vertical plate 92. The output shaft of the RV reducer 91 is connected to all the self-rotating jigs 93 through a synchronous belt assembly. The synchronous belt assembly includes a driving synchronous pulley, a driven synchronous pulley, a synchronous guide pulley, a tensioning synchronous pulley, a support plate, a tensioning eccentric disc and a synchronous belt. The driving synchronous pulley is arranged on the output shaft of the RV reducer 91. The driven synchronous pulley is arranged at the tail end of the self-rotating shaft. The tensioning eccentric disc is arranged on the exchange table 5 through the support plate. The tensioning synchronous pulley is arranged on the eccentric shaft of the tensioning eccentric disc. The synchronous guide pulley is arranged on the vertical plate 92 corresponding to the position between two adjacent driven synchronous pulleys. The synchronous belt winds around the driving synchronous pulley, the driven synchronous pulley, the synchronous guide pulley and the tensioning synchronous pulley to achieve synchronous rotation.

[0032] The input shaft of the RV reducer 91 faces downward. The upper end of the upper docking shaft 94 is disposed on the input shaft of the RV reducer 91, and the lower end extends vertically downward and is provided with upper docking teeth adapted to the lower docking teeth. Preferably, a docking through hole for the lower docking shaft 82 to pass through is provided at the position of the exchange table 5 corresponding to the upper docking shaft 94, facilitating the docking of the lower docking shaft 82 with the upper docking shaft 94 through the docking through hole. The power transmission between the lower docking shaft 82 and the upper docking shaft 94 is achieved through the docking and meshing of the lower docking teeth and the upper docking teeth.

[0033] During operation, since there are two sets of clamping and self-rotating mechanisms 9 on the exchange table 5, when one set of clamping and self-rotating mechanisms 9 completes one round of grinding, the exchange drive device 6 drives the exchange table 5 to rotate 180 degrees to turn it to the loading and unloading station, while at the same time the other set of clamping and self-rotating mechanisms 9 correspondingly turns to the grinding station to start a new round of grinding. In this way, the entire grinding production process can proceed seamlessly, avoiding interruptions and pauses, realizing the alternating grinding process of the handle-shaped workpieces, and having high working efficiency.

[0034] Based on the disclosure and teachings of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention. Any other grinding machines using the same or similar structures are within the protection scope of the present invention.

Claims

1. A bench - type grinding machine for exchange, which comprises a machine base, a Y - axis moving mechanism, a Z - axis moving mechanism and a belt grinding head, and is characterized in that, It further includes a switching table, a switching driving device, a self-rotating power coaxial device, a self-rotating power device, and two clamping and self-rotating mechanisms. The Z-axis moving mechanism is arranged on the machine base through the Y-axis moving mechanism and is driven by the Y-axis moving mechanism to reciprocate in the Y-axis direction. The sand belt grinding head is arranged on the Z-axis moving mechanism and is driven by it to reciprocate in the Z-axis direction. The switching driving device is arranged on the machine base corresponding to the front position of the Y-axis moving mechanism. The switching table is arranged on the switching driving device and is driven by the switching driving device to perform a rotating action. The two clamping and self-rotating mechanisms are arranged side by side on the switching table. The self-rotating power device is arranged on the machine base through the self-rotating power coaxial device and is driven by the self-rotating power coaxial device to be connected to one of the clamping and self-rotating mechanisms.

2. The bench - type grinding machine according to claim 1, wherein: The switching driving device includes a base, a reduction motor, and a cam divider. The cam divider is arranged on the machine base through the base. The reduction motor is arranged on the machine base corresponding to one side of the base. The reduction motor drives the cam divider through a belt transmission component.

3. The bench-mounted grinding machine according to claim 1, wherein: The self-rotating power coaxial device includes a bracket, a lifting cylinder, a connecting rod, and a linkage seat. The linkage seat is arranged on one side wall of the bracket through a linear slide rail component. The lifting cylinder is arranged on the other side wall of the bracket. One end of the connecting rod is fixed to the linkage seat, and the other end is fixed to the piston rod of the lifting cylinder.

4. The bench-mounted grinding machine according to claim 3, wherein: The self-rotating power device includes a servo motor and a lower docking shaft. The servo motor is arranged on the linkage seat. One end of the lower docking shaft is arranged on the driving shaft of the servo motor, and the other side is vertically oriented and provided with lower docking teeth.

5. The bench - type grinding machine according to claim 4, wherein: The clamping and self-rotating mechanism includes an RV reducer, a vertical plate, a self-rotating jig, and an upper docking shaft. The vertical plate is vertically arranged on the switching table. A plurality of self-rotating jigs are arranged side by side on the vertical plate. The RV reducer is arranged at one end of the vertical plate. The output shaft of the RV reducer is connected to all the self-rotating jigs through a synchronous belt component. The input shaft of the RV reducer faces downward. The upper end of the upper docking shaft is arranged on the input shaft of the RV reducer, and the lower end extends vertically downward and is provided with upper docking teeth adapted to the lower docking teeth.

6. The tabletop grinding machine according to claim 5, wherein: The switching table is provided with a docking through hole at a position corresponding to the upper docking shaft for the lower docking shaft to pass through.

7. The bench - type grinding machine according to claim 6, wherein: The self-rotating jig includes a self-rotating sleeve seat, a self-rotating shaft, and a workpiece jig. The self-rotating shaft is arranged on the self-rotating sleeve seat through two tapered roller bearings. The workpiece jig is arranged at the front end of the self-rotating shaft.

8. The bench-mounted grinding machine according to claim 7, wherein: The synchronous belt component includes a driving synchronous pulley, a driven synchronous pulley, a synchronous guide pulley, a tensioning synchronous pulley, a support plate, a tensioning eccentric disk, and a synchronous belt. The driving synchronous pulley is arranged on the output shaft of the RV reducer. The driven synchronous pulley is arranged at the tail end of the self-rotating shaft. The tensioning eccentric disk is arranged on the switching table through the support plate. The tensioning synchronous pulley is arranged on the eccentric shaft of the tensioning eccentric disk. The synchronous guide pulley is arranged on the vertical plate at a position corresponding to the space between two adjacent driven synchronous pulleys. The synchronous belt passes around the driving synchronous pulley, the driven synchronous pulley, the synchronous guide pulley, and the tensioning synchronous pulley.

9. The bench - type grinding machine according to claim 1, characterized in that: The abrasive belt grinding head includes an electric cylinder driving device, a lifting seat, an extension arm, a rotating seat and an abrasive belt grinding assembly. The lifting seat is arranged on the Z-axis moving mechanism. The abrasive belt grinding assembly is arranged on the front surface of the rotating seat. One end of the extension arm is fixed on the lifting seat, and the other end extends to the front surface of the rotating seat and is hinged on the rotating seat through a hinge shaft. The axis of the hinge shaft is aligned with the center line of the abrasive belt of the abrasive belt grinding assembly. The electric cylinder driving device is arranged on the lifting seat and can drive the rotating seat to rotate around the hinge shaft as the axis.

10. The bench-mounted grinder according to claim 9, characterized in that: The abrasive belt grinding assembly includes a grinding motor, a driving pulley, a driven pulley, an abrasive belt adjusting device and a plurality of grinding pressure wheels. The plurality of grinding pressure wheels are arranged side by side at intervals at the lower edge position of the rotating seat. The grinding motor is arranged on one side of the rotating seat. The driving pulley is arranged on the driving shaft of the grinding motor. The driven pulley is arranged on the other side of the rotating seat through the abrasive belt adjusting device. The abrasive belt passes around the driving pulley, the driven pulley and the grinding pressure wheels.

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