CN223160680U

CN223160680U - Exchange table type polisher

Info

Publication number: CN223160680U
Application number: CN202421731471.5U
Authority: CN
Inventors: 张瑞军
Original assignee: Ju Hua Machinery Making Co ltd
Current assignee: Ju Hua Machinery Making Co ltd
Priority date: 2024-07-19
Filing date: 2024-07-19
Publication date: 2025-07-29
Anticipated expiration: 2034-07-19

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 combining device, an autorotation power device and two assembly clamp autorotation mechanisms. Two assembly clamp rotation mechanisms are arranged on the exchange table to form two independent clamping stations, and when one assembly clamp rotation mechanism drives the handle workpiece to polish, the other assembly clamp rotation mechanism can be simultaneously unloaded and charged, so that the idle time of the production line is reduced to the greatest extent. When one set of clamping rotation mechanism finishes one round of polishing, the exchange driving device drives the exchange table to rotate so as to enable the exchange table to rotate to the upper and lower material stations, and the other set of clamping rotation mechanism correspondingly rotates to the polishing station to start a new round of polishing, so that the whole polishing production process can be performed seamlessly, interruption and pause are avoided, the alternative polishing processing of handle workpieces is realized, the equipment utilization rate is improved, and the working efficiency is high.

Description

Exchange table type polisher

Technical Field

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

Background

In the processing process of daily hardware parts, polishing processing is often required to be carried out on certain parts, and a plurality of polishing machines are introduced in the market for improving the polishing effect. However, special polishing machines need to be developed for polishing parts of different shapes.

In order to polish handle parts, the patent of the utility model, for example, publication number CN217493768U, discloses a handle polishing device, which comprises a machine base, a handle polishing mechanism, a cutter clamping mechanism, a displacement detection mechanism and a first rotating mechanism, wherein the handle polishing mechanism is arranged on the machine base and can move along the vertical direction, the handle polishing mechanism comprises a first mounting plate and an abrasive belt polishing assembly connected to the first mounting plate, the cutter clamping mechanism is arranged on one side of the handle polishing mechanism and comprises at least one first clamping piece for placing a cutter to be processed and one second clamping piece for placing a standard cutter, the first clamping piece and the second clamping piece can move towards or away from the handle polishing mechanism, the second clamping piece can also rotate around the axis of the horizontal direction, the displacement detection mechanism is arranged along the vertical direction and corresponds to the position of the second clamping piece, and comprises a detection head and a detection piece, and the detection piece is used for detecting the displacement of the detection head moving along the vertical direction. The first rotating mechanism comprises a transverse plate and two vertical plates, wherein the two vertical plates are arranged at intervals and are respectively connected with the transverse plate, a rotating plate is connected between the two vertical plates in a rotating mode, one end of the rotating plate is connected with a first motor used for driving the rotating plate to rotate around the axis of the horizontal direction, and at least one first clamping piece and one second clamping piece are arranged on the rotating plate at intervals. Because handle of a knife grinding machanism is fixed but tilting rotation, but drives the rotation board and rotate the up-and-down swing that realizes the handle of a knife around the axis of horizontal direction by first motor, nevertheless can realize polishing to the handle of a knife like this, after polishing a set of handle of a knife, need shut down and take off the handle of a knife that will polish, then change the handle of a knife that needs to polish again, and in this change process, machinery is the stop work, has longer latency, just can carry out the polishing of next batch, causes the production line idle time more, production efficiency is lower.

Disclosure of utility model

Aiming at the defects, the utility model aims to provide the exchange table type grinding machine which is reasonable in structural design and high in working efficiency.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

The exchanging table type grinding machine comprises a machine base, a Y-axis moving mechanism, a Z-axis moving mechanism, an abrasive belt grinding head, an exchanging table, an exchanging driving device, an autorotation power shaft-combining device, an autorotation power device and two assembling clamp autorotation mechanisms, wherein 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 abrasive belt grinding head is arranged on the Z-axis moving mechanism and is driven by the Z-axis moving mechanism to reciprocate in the Z-axis direction, the exchanging driving device is arranged on the machine base corresponding to the front position of the Y-axis moving mechanism, the exchanging table is arranged on the exchanging driving device and is driven by the exchanging driving device to rotate, the two assembling clamp autorotation mechanisms are arranged on the exchanging table side by side, and the autorotation power device is arranged on the machine base through the autorotation power shaft-combining device and is driven by the power shaft-combining device to be connected with one assembling clamp autorotation mechanism.

As a preferable scheme of the utility model, the exchange driving device comprises a base, a gear motor and a cam divider, wherein the cam divider is arranged on the base through the base, the gear motor is arranged on the base corresponding to one side position of the base, the gear motor drives the cam divider through a belt transmission assembly, and the cam divider drives the exchange platform to rotate 180 degrees.

As a preferable scheme of the utility model, the autorotation power shaft-combining device comprises a bracket, a lifting cylinder, a connecting rod and a linkage seat, wherein the linkage seat is arranged on one side wall of the bracket through a linear sliding rail assembly, the lifting cylinder is arranged on the other side wall of the bracket, one end of the connecting rod is fixed with the linkage seat, the other end of the connecting rod is fixed with a piston rod of the lifting cylinder, and the linkage seat is driven to lift through the expansion and contraction of the piston rod of the lifting cylinder.

As a preferable scheme of the utility model, the autorotation power device comprises a servo motor and a lower butt joint shaft, wherein the servo motor is arranged on the linkage seat, one end of the lower butt joint shaft is arranged on a driving shaft of the servo motor, the other side of the lower butt joint shaft faces vertically, and lower butt joint teeth are arranged. And the servo motor drives the lower butt joint shaft to rotate.

As a preferable scheme of the utility model, the clamping autorotation mechanism comprises an RV speed reducer, a vertical plate, autorotation jigs and an upper butt joint shaft, wherein the vertical plate is vertically arranged on the exchange table, a plurality of autorotation jigs are arranged on the vertical plate side by side, the RV speed reducer is arranged at one end of the vertical plate, an output shaft of the RV speed reducer is connected with all autorotation jigs through a synchronous belt assembly, an input shaft of the RV speed reducer faces downwards, the upper end of the upper butt joint shaft is arranged on the input shaft of the RV speed reducer, and the lower end of the upper autorotation jig extends vertically downwards and is provided with upper butt joint teeth matched with the lower butt joint teeth. And the power transmission of the lower butt joint shaft and the upper butt joint shaft is realized through the butt joint engagement of the lower butt joint teeth and the upper butt joint teeth.

As a preferable scheme of the utility model, the position of the exchange platform corresponding to the upper butt joint shaft is provided with a butt joint through hole for the lower butt joint shaft to pass through, and the lower butt joint shaft is convenient to butt joint with the upper butt joint shaft through the butt joint through hole.

As a preferable scheme of the utility model, the rotation jig comprises a rotation sleeve seat, a rotation shaft and a workpiece jig, wherein the rotation shaft is arranged on the rotation sleeve seat through two tapered roller bearings, and the workpiece jig is arranged at the front end of the rotation shaft and is suitable for clamping and polishing various handle workpieces.

As a preferable scheme of the utility model, the synchronous belt assembly comprises a driving synchronous wheel, a driven synchronous wheel, a synchronous guide wheel, a tensioning synchronous wheel, a support plate, a tensioning eccentric disc and a synchronous belt, wherein the driving synchronous wheel is arranged on an output shaft of the RV speed reducer, the driven synchronous wheel is arranged at the tail end of the rotating shaft, the tensioning eccentric disc is arranged on a exchanging table through the support plate, the tensioning synchronous wheel is arranged on an eccentric shaft of the tensioning eccentric disc, the synchronous guide wheel is arranged on a vertical plate corresponding to the position between two adjacent driven synchronous wheels, and the synchronous belt winds the driving synchronous wheel, the driven synchronous wheel, the synchronous guide wheel and the tensioning synchronous wheel to realize synchronous rotation.

As a preferable scheme of the utility model, the abrasive belt polishing head comprises an electric cylinder driving device, a lifting seat, an extension arm, a swivel base and an abrasive belt polishing assembly, wherein the lifting seat is arranged on a Z-axis moving mechanism, the abrasive belt polishing assembly is arranged on the front surface of the swivel base, one end of the extension arm is fixed on the lifting seat, the other end of the extension arm extends to the front surface of the swivel base and is hinged on the swivel base through a hinge shaft, the axis of the hinge shaft is aligned with the abrasive belt center line of the abrasive belt polishing assembly, and the electric cylinder driving device is arranged on the lifting seat and can drive the swivel base to rotate by taking the hinge shaft as an axis.

As a preferable scheme of the utility model, the abrasive belt polishing assembly comprises a polishing motor, a driving belt wheel, a driven belt wheel, an abrasive belt adjusting device and a plurality of polishing pressing wheels, wherein the polishing pressing wheels are arranged at the lower edge of the rotary seat at intervals, the polishing motor is arranged on one side of the rotary seat, the driving belt wheel is arranged on a driving shaft of the polishing motor, the driven belt wheel is arranged on the other side of the rotary seat through the abrasive belt adjusting device, and the abrasive belt bypasses the driving belt wheel, the driven belt wheel and the polishing pressing wheels.

The automatic grinding machine has the beneficial effects that the automatic grinding machine is reasonable in structural design, two assembly clamp autorotation mechanisms are arranged on the exchange table to form two independent clamping stations, and when one assembly clamp autorotation mechanism drives a handle workpiece to grind, the other assembly clamp autorotation mechanism can be simultaneously disassembled and charged, so that the idle time of a production line is reduced to the greatest extent. When one set of clamping rotation mechanism finishes one-round polishing, the exchange driving device drives the exchange table to rotate so as to enable the exchange table to rotate to the upper and lower material stations, and the other set of clamping rotation mechanism correspondingly rotates to the polishing station to start new-round polishing, so that the whole polishing production process can be performed seamlessly, interruption and pause are avoided, alternative polishing processing of handle workpieces is realized, and equipment utilization rate and production efficiency are improved. In addition, the whole structure is simple, easy to realize and beneficial to wide popularization and application.

The utility model will be further described with reference to the drawings and examples.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic structural view of a sanding head in accordance with the present utility model.

Fig. 3 is a schematic structural view of the switching driving device in the present utility model.

Fig. 4 is a schematic view of the structure of the chuck rotation mechanism of the present utility model.

Fig. 5 is a schematic structural view of the rotation power coupling device in the present utility model.

Detailed Description

Referring to fig. 1 to 5, the present embodiment provides a bench exchanging sander, which includes a base 1, a Y-axis moving mechanism 2, a Z-axis moving mechanism 3, a sanding belt sanding head 4, a exchanging table 5, an exchanging driving device 6, a rotation power shaft device 7, a rotation power device 8, and two assembly clamp rotation mechanisms 9.

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 reciprocate in the Y-axis direction, and the abrasive belt polishing head 4 is arranged on the Z-axis moving mechanism 3 and is driven by the Z-axis moving mechanism to reciprocate in the Z-axis direction. Specifically, the abrasive belt polishing head 4 comprises an electric cylinder driving device 41, a lifting seat 42, an extension arm 43, a swivel seat 44 and an abrasive belt polishing assembly 45, wherein the lifting seat 42 is arranged on the Z-axis moving mechanism 3, the abrasive belt polishing assembly 45 is arranged on the front surface of the swivel seat 44, one end of the extension arm 43 is fixed on the lifting seat 42, the other end of the extension arm extends to the front surface of the swivel seat 44 and is hinged on the swivel seat 44 through a hinge shaft, preferably, the swivel seat 44 is provided with a long hole for the extension arm 43 to pass through, two hinge seats are respectively arranged at two sides of the corresponding long hole, and two ends of the hinge shaft are arranged on the hinge seats. The other end of the extension arm 43 is disposed on the hinge shaft through the long hole. The axis of the hinge shaft is aligned with the belt centre line of the belt sanding head 4. The traditional polisher, because the position of handle class work piece is far away from its swing axis distance, leads to handle class work piece swing range from top to bottom big, then needs handle of a knife grinding machanism frequently to do big stroke elevating movement just to realize polishing purpose, just also increases the loss of Z axle moving mechanism 3 correspondingly, shortens life, and big stroke elevating movement also needs to consume more time moreover, work efficiency is low. In the utility model, because the rotation axis of the swivel base 44 is aligned with the center line of the abrasive belt polishing head 4, the polishing requirement of the handle workpiece can be met only by driving the swivel base 44 to rotate and swing by the electric cylinder driving device 41, the problem that the traditional handle workpiece needs to swing up and down greatly is avoided, the lifting travel distance of the Z-axis moving mechanism 3 is effectively shortened, the loss is reduced, and the working efficiency is further improved.

The electric cylinder driving device 41 is disposed on the lifting seat 42, and can drive the swivel base 44 to rotate about the hinge shaft. Specifically, the two sides of the lifting seat 42 are provided with mounting plates, the mounting plates are provided with rear vertical bearing seats, the rear vertical bearing seats are correspondingly positioned on the back surfaces of the swivel seats 44 and are provided with front vertical bearing seats, one end of the electric cylinder driving device 41 is arranged on the rear vertical bearing seats through rear rotating shafts, and the other end of the electric cylinder driving device 41 is arranged on the front vertical bearing seats through front rotating shafts. Adopt electronic jar drive arrangement 41 drive swivel mount 44 to rotate, rotate steadily, improved the reliability and the stability of equipment operation, ensure the effect of polishing.

The abrasive belt polishing assembly 45 comprises a polishing motor, a driving belt wheel, a driven belt wheel, an abrasive belt adjusting device and a plurality of polishing pinch rollers, wherein the polishing pinch rollers are arranged at the lower edge of the rotary seat 44 side by side at intervals, and preferably, arc-shaped concave positions are arranged on the rotary seat 44 corresponding to positions between two adjacent polishing pinch rollers, and can avoid handle workpieces through the arc-shaped concave positions, so that polishing procedures are facilitated. The abrasive belt part which winds between two adjacent polishing pinch rollers is utilized for polishing, and the polishing belt has certain elasticity. The grinding motor is arranged on one side of the swivel base 44, the driving belt wheel is arranged on a driving shaft of the grinding motor, the driven belt wheel is arranged on the other side of the swivel base 44 through an abrasive belt adjusting device, the abrasive belt adjusting device comprises an air cylinder seat, a tensioning air cylinder, a rotating bearing, a wheel frame, an installation seat and an adjusting handle, the tensioning air cylinder is arranged on the swivel base 44 through the air cylinder seat, the installation seat is arranged on a piston rod of the tensioning air cylinder, an assembly cavity matched with the appearance of the rotating bearing is arranged on the back surface of the wheel frame, the rotating bearing is fixed in the assembly cavity, an installation shaft arranged on the inner ring of the rotating bearing is arranged on the front surface of the installation seat, the two adjusting handles are symmetrically arranged on two sides of the wheel frame and can be propped against the top surfaces of two sides of the installation seat, and the driven belt wheel is arranged on the wheel frame. The position of the driven belt wheel is adjusted through the extension and retraction of the tensioning cylinder, so that the aim of adjusting the tension of the abrasive belt is fulfilled. The rotating angle of the wheel frame is adjusted through the adjusting handle so as to adjust the deflection angle of the driven belt wheel, thereby realizing the deflection adjustment of the abrasive belt. During operation, the abrasive belt winds the driving belt wheel, the driven belt wheel and the polishing pinch roller. The polishing motor drives the driving belt wheel, and drives the driven belt wheel and the polishing pinch roller through the abrasive belt, so that the polishing purpose is realized.

The exchange driving device 6 is arranged on the base 1 corresponding to the front position of the Y-axis moving mechanism 2, and the exchange table 5 is arranged on the exchange driving device 6 and is driven by the exchange driving device 6 to rotate. Specifically, the exchange driving device 6 includes a base 61, a gear motor 62 and a cam divider 63, the cam divider 63 is disposed on the base 1 through the base 61, the gear motor 62 is disposed on the base 1 corresponding to a position of one side of the base 61, the gear 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.

The two assembly clamp autorotation mechanisms 9 are arranged on the exchange table 5 side by side, and the autorotation power device 8 is arranged on the machine base 1 through the autorotation power shaft-combining device 7 and is driven by the autorotation power shaft-combining device 7 to be connected with one assembly clamp autorotation mechanism 9. The rotation power shaft combining device 7 comprises a bracket 71, a lifting cylinder 72, a connecting rod 73 and a linkage seat 74, wherein the linkage seat 74 is arranged on one side wall of the bracket 71 through a linear sliding 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 with the linkage seat 74, the other end of the connecting rod 73 is fixed with a piston rod of the lifting cylinder 72, and the linkage seat 74 is driven to lift through expansion and contraction of the piston rod of the lifting cylinder 72.

The rotation power device 8 comprises a servo motor 81 and a lower butt joint shaft 82, the servo motor 81 is arranged on the linkage seat 74, one end of the lower butt joint shaft 82 is arranged on a driving shaft of the servo motor 81, the other side faces vertically, and lower butt joint teeth are arranged. The lower docking shaft 82 is driven to rotate by the servo motor 81.

The clamping rotation mechanism 9 comprises an RV speed reducer 91, a vertical plate 92, rotation jigs 93 and an upper butt joint shaft 94, wherein the vertical plate 92 is vertically arranged on the exchange table 5, and a plurality of rotation jigs 93 are arranged on the vertical plate 92 side by side. The rotation tool 93 comprises a rotation sleeve seat, a rotation shaft and a workpiece tool, wherein the rotation shaft is arranged on the rotation sleeve seat through two tapered roller bearings, and the workpiece tool is arranged at the front end of the rotation shaft and is suitable for clamping and polishing various handle workpieces.

The RV speed reducer 91 is arranged at one end of the vertical plate 92, an output shaft of the RV speed reducer 91 is connected with all the rotation jigs 93 through a synchronous belt assembly, the synchronous belt assembly comprises a driving synchronous wheel, a driven synchronous wheel, a synchronous guide wheel, a tensioning synchronous wheel, a support plate, a tensioning eccentric disc and a synchronous belt, the driving synchronous wheel is arranged on the output shaft of the RV speed reducer 91, the driven synchronous wheel is arranged at the tail end of the rotation shaft, the tensioning eccentric disc is arranged on the exchange table 5 through the support plate, the tensioning synchronous wheel is arranged on an eccentric shaft of the tensioning eccentric disc, the synchronous guide wheel is arranged on the vertical plate 92 corresponding to the position between two adjacent driven synchronous wheels, and the synchronous belt is wound by the driving synchronous wheel, the driven synchronous wheel, the synchronous guide wheel and the tensioning synchronous wheel to realize synchronous rotation.

The input shaft of the RV reducer 91 is 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 is provided at a position of the exchange table 5 corresponding to the upper docking shaft 94, through which the lower docking shaft 82 passes, so that the lower docking shaft 82 is conveniently docked with the upper docking shaft 94. The power transmission of the lower docking shaft 82 and the upper docking shaft 94 is achieved by the mating engagement of the lower docking teeth with the upper docking teeth.

When the automatic polishing machine works, as the two assembly clamp autorotation mechanisms 9 are arranged on the exchange table 5, after one assembly clamp autorotation mechanism 9 finishes one-round polishing, the exchange driving device 6 drives the exchange table 5 to rotate 180 degrees to enable the exchange table to rotate to the upper and lower material stations, and simultaneously the other assembly clamp autorotation mechanism 9 correspondingly rotates to the polishing station to start polishing for a new round, so that the whole polishing production process can be performed seamlessly, interruption and pause are avoided, alternative polishing processing of handle workpieces is realized, and the working efficiency is high.

Variations and modifications to the above would be obvious to persons skilled in the art to which the utility model pertains from the foregoing description and teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are used for convenience of description and do not limit the present utility model in any way, and other polishing machines identical or similar thereto are used within the scope of the present utility model.

Claims

1. The exchanging desk type grinding machine is characterized by further comprising an exchanging desk, an exchanging driving device, a rotation power shaft combining device, a rotation power device and two assembly clamp rotation mechanisms, wherein 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 abrasive belt grinding head is arranged on the Z-axis moving mechanism and is driven by the Z-axis moving mechanism to reciprocate in the Z-axis direction, the exchanging driving device is arranged on the machine base corresponding to the front position of the Y-axis moving mechanism, the exchanging desk is arranged on the exchanging driving device and is driven by the exchanging driving device to do rotary motion, the two assembly clamp rotation mechanisms are arranged on the exchanging desk side by side, and the rotation power device is arranged on the machine base through the rotation power shaft combining device and is driven by the rotation power shaft combining device to be connected with one assembly clamp rotation mechanism.

2. The exchanging desk type sander as set forth in claim 1, wherein the exchanging drive means comprises a base, a gear motor and a cam divider, wherein the cam divider is provided on the base through the base, the gear motor is provided on the base corresponding to a position on one side of the base, and the gear motor drives the cam divider through a belt transmission assembly.

3. The exchanging desk type sander of claim 1, wherein the autorotation power shaft-combining device comprises a bracket, a lifting cylinder, a connecting rod and a linkage seat, wherein the linkage seat is arranged on one side wall of the bracket through a linear sliding rail assembly, the lifting cylinder is arranged on the other side wall of the bracket, one end of the connecting rod is fixed with the linkage seat, and the other end of the connecting rod is fixed with a piston rod of the lifting cylinder.

4. The exchanging desk type sander as set forth in claim 3, wherein the rotation power means comprises a servo motor and a lower docking shaft, wherein the servo motor is disposed on the linkage seat, one end of the lower docking shaft is disposed on a driving shaft of the servo motor, and the other end is vertically oriented and is provided with a lower docking tooth.

5. The exchanging desk type grinding machine of claim 4, wherein the clamping autorotation mechanism comprises an RV reducer, a vertical plate, autorotation jigs and an upper butt joint shaft, the vertical plate is vertically arranged on the exchanging desk, a plurality of autorotation jigs are arranged on the vertical plate side by side, the RV reducer is arranged at one end of the vertical plate, an output shaft of the RV reducer is connected with all autorotation jigs through a synchronous belt assembly, an input shaft of the RV reducer faces downwards, the upper end of the upper butt joint shaft is arranged on the input shaft of the RV reducer, and the lower end of the upper butt joint shaft extends downwards vertically and is provided with upper butt joint teeth matched with the lower butt joint teeth.

6. The exchanging desk type sander as set forth in claim 5, wherein a docking through hole is provided at a position of the exchanging desk corresponding to the upper docking shaft, through which the lower docking shaft passes.

7. The exchanging desk type sander as set forth in claim 6, wherein the rotating jig comprises a rotating housing, a rotating shaft and a workpiece jig, wherein the rotating shaft is arranged on the rotating housing through two tapered roller bearings, and the workpiece jig is arranged at the front end of the rotating shaft.

8. The exchanging desk type grinding machine of claim 7, wherein the synchronous belt assembly comprises a driving synchronous wheel, a driven synchronous wheel, a synchronous guide wheel, a tensioning synchronous wheel, a support plate, a tensioning eccentric disc and a synchronous belt, wherein the driving synchronous wheel is arranged on an output shaft of the RV speed reducer, the driven synchronous wheel is arranged at the tail end of the rotating shaft, the tensioning eccentric disc is arranged on the exchanging desk through the support plate, the tensioning synchronous wheel is arranged on an eccentric shaft of the tensioning eccentric disc, the synchronous guide wheel is arranged on a vertical plate corresponding to a position between two adjacent driven synchronous wheels, and the synchronous belt winds the driving synchronous wheel, the driven synchronous wheel, the synchronous guide wheel and the tensioning synchronous wheel.

9. The exchanging bench type sander of claim 1, wherein the sanding belt sanding head comprises an electric cylinder driving device, a lifting seat, an extension arm, a swivel base and a sanding belt sanding assembly, wherein the lifting seat is arranged on the Z-axis moving mechanism, the sanding belt sanding assembly is arranged on the front face of the swivel base, one end of the extension arm is fixed on the lifting seat, the other end of the extension arm extends to the front face of the swivel base and is hinged on the swivel base through a hinge shaft, the axis of the hinge shaft is aligned with the center line of a sanding belt of the sanding belt sanding assembly, and the electric cylinder driving device is arranged on the lifting seat and can drive the swivel base to rotate by taking the hinge shaft as an axis.

10. The exchanging bench type sander of claim 9, wherein the sanding belt sanding assembly comprises a sanding motor, a driving pulley, a driven pulley, a sanding belt adjusting device and a plurality of sanding rollers, wherein the plurality of sanding rollers are arranged at the lower edge of the swivel base at intervals side by side, the sanding motor is arranged on one side of the swivel base, the driving pulley is arranged on a driving shaft of the sanding motor, the driven pulley is arranged on the other side of the swivel base through the sanding belt adjusting device, and the sanding belt bypasses the driving pulley, the driven pulley and the sanding rollers.