Grinding head and grinding device

Abstract

The present invention provides a grinding head and a grinding device, which relate to the technical field of grinding equipment. The grinding head includes a mounting sleeve, an elastic expansion cylinder, grinding sandpaper, and a pressing member. One end of the mounting sleeve is provided with a connector and the other end is provided with an opening. A first strip groove extending through the opening is provided on the side wall of the mounting sleeve; the elastic expansion cylinder can be placed in the mounting sleeve and fit with the mounting sleeve, and the elastic expansion cylinder has a second strip groove; the grinding sandpaper is wound around the outside of the mounting sleeve, and both ends of the grinding sandpaper are inserted into the first strip groove and can extend into the second strip groove; the pressing member includes a pressing plate and a positioning screw, the pressing plate is provided on one side of the opening end of the mounting sleeve; the positioning screw is passed through the pressing plate, and the head of the positioning screw presses the pressing plate onto the mounting sleeve. A mounting platform is provided in the mounting sleeve, and a threaded hole matching the positioning screw is provided on the mounting platform. The present invention can quickly install and disassemble the grinding sandpaper to improve the grinding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding equipment, and in particular to a grinding head and a grinding device. Background Art

[0002] When grinding the surface of metal, plastic, glass and other products, a grinder is needed. The grinding head plays a key role in the grinder. The grinder drives the grinding head to rotate at high speed through the power unit to grind the surface of the product.

[0003] Current grinding heads typically include a mounting sleeve and sandpaper, which is bonded to the mounting sleeve. Because sandpaper consists of a base material and abrasive, the abrasive gradually wears out and falls off during use, causing the sandpaper's grinding performance to degrade and eventually become unusable. Furthermore, when replacing sandpaper, removing it from the mounting sleeve and bonding new sandpaper to it require significant time, resulting in prolonged downtime for the grinding device and impacting grinding efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a grinding head which can quickly install and remove grinding sandpaper, thereby reducing the downtime of the grinding device and improving the grinding efficiency.

[0005] The present invention is achieved through the following technical solutions: a grinding head, comprising: a mounting sleeve, one end of the mounting sleeve is provided with a connector, the other end is provided with an opening, a side wall of the mounting sleeve is provided with a first strip groove extending through the opening; an elastic expansion cylinder, the elastic expansion cylinder can be placed in the mounting sleeve and fit with the mounting sleeve, the elastic expansion cylinder has a second strip groove; grinding sandpaper, the grinding sandpaper is wound around the outside of the mounting sleeve, both ends of the grinding sandpaper are inserted into the first strip groove and can extend into the second strip groove; a pressing piece, the pressing piece includes a pressing sheet and a positioning screw, the pressing sheet is provided on the mounting sleeve One side of the open end; the positioning screw is passed through the clamping plate, and the head of the positioning screw can press the clamping plate onto the mounting sleeve, and a mounting platform is provided in the mounting sleeve, and a threaded hole matching the positioning screw is provided on the mounting platform; wherein, an expansion mechanism is provided on the mounting platform for expanding the elastic expansion cylinder toward one end inside the mounting sleeve, and the expansion mechanism includes a support ring and an expanding block circumferentially arranged on the side wall of the support ring, and a protrusion is provided on the positioning screw for driving the expanding block to move outside the support ring; an expanding rod is provided on the compression plate for expanding the end of the elastic expansion cylinder toward the outside of the mounting sleeve.

[0006] Furthermore, a through groove is radially provided on the support ring, the expansion block is slidably arranged in the through groove and one end of the expansion block extends to the inner ring of the support ring, a limiting block is provided on the expansion block, and a limiting groove connected to the through groove is provided on the end face of the support ring, and the limiting blocks all extend to the outside of the end face of the support ring, and a shrinking ring is provided between the plurality of limiting blocks, and the shrinking ring can drive the plurality of limiting blocks to move toward the center position of the support ring at the same time.

[0007] Furthermore, a tapered portion is provided at one end of the expansion rod away from the compression plate, and when the expansion rod is inserted into the second strip groove, the elastic expansion tube can expand to press against the inner wall of the mounting sleeve.

[0008] Furthermore, the width of the sandpaper is greater than the length of the first strip groove, and the pressing sheet is pressed on the end of the sandpaper extending out of the mounting sleeve.

[0009] 7. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said linking rod.

[0010] Furthermore, the tensioning assembly includes a mounting plate, on which a plurality of tensioning rods are distributed circumferentially, one end of each tensioning rod is hingedly mounted on the mounting plate, the end of the elastic expansion cylinder facing the outside of the mounting sleeve is provided with a conical surface, and the end of the tensioning rod away from the mounting plate is provided with an arc-shaped chamfer capable of being inserted into the conical surface; the mounting plate is provided with a driving assembly for driving the plurality of tensioning rods to simultaneously open in a direction away from each other or simultaneously tighten in a direction close to each other.

[0011] Furthermore, the driving assembly includes a driving ring and a driving screw, the driving screw is threadedly connected to the mounting plate, and a rotating seat is provided in the middle of the driving ring, and the rotating seat rotates with the driving screw; a plurality of driving grooves for the tensioning rod to pass through are distributed circumferentially on the driving ring, and driving blocks are provided on the tensioning rod and on both sides of the driving ring, and the two driving blocks are respectively located on the opposite sides of the tensioning rod.

[0012] Furthermore, the thickness of the driving groove is greater than the thickness of the tensioning rod, and a surface of the driving block away from the tensioning rod is provided with an inclined surface.

[0013] Furthermore, the magnetic block is provided with a notch for the head of the positioning screw to pass through.

[0014] Furthermore, an arc-shaped rib is provided at the bottom of the magnetic block, and the arc-shaped rib and the mounting plate are both coaxially arranged with the drive shaft.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0016] 1. The present invention provides a first strip groove on the mounting sleeve, arranges an elastic expansion tube in the mounting sleeve and arranges a second strip groove on the elastic expansion tube, passes one end of the grinding sandpaper through the first strip groove and inserts it into the second strip groove, and then winds the grinding sandpaper around the mounting sleeve for one circle, and then passes the other end of the grinding sandpaper through the first strip groove and inserts it into the second strip groove, so that the elastic expansion tube and the mounting sleeve rotate relative to each other to drive both ends of the grinding sandpaper to move between the gap between the elastic expansion tube and the mounting sleeve, that is, the grinding sandpaper can be tightly attached to the mounting sleeve; there is no need to fix the grinding sandpaper on the mounting sleeve by bonding, and the process of removing and installing the grinding sandpaper can be conveniently completed.

[0017] 2. The present invention arranges an expansion mechanism on the mounting platform and an expansion rod on the pressing plate. Under the joint action of the expansion rod and the expansion mechanism, the elastic expansion cylinder can be tightly attached to the inner wall of the mounting sleeve as a whole, thereby improving the positioning effect of the end of the grinding sandpaper and preventing the grinding sandpaper from sliding relative to the mounting sleeve during the grinding process.

[0018] 3. The present invention arranges an auxiliary disassembly and assembly mechanism on the workbench. The magnetic block of the auxiliary disassembly and assembly mechanism can attract the compression plate, so that the compression plate drives the positioning screw to separate from the installation sleeve; the tensioning component of the auxiliary disassembly and assembly mechanism can tighten and expand the elastic expansion cylinder, thereby facilitating the disassembly and assembly process of the sandpaper and improving the convenience of the disassembly and assembly process of the sandpaper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of the grinding head of the present invention;

[0020] Figure 2 Schematic diagram of the internal structure of the grinding head of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the pressing member and the expansion mechanism of the present invention;

[0022] Figure 4It is a structural schematic diagram of the expansion mechanism of the present invention;

[0023] Figure 5 Schematic diagram of the overall structure of the grinding device of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the grinding head, grinding seat and auxiliary disassembly and assembly mechanism of the present invention;

[0025] Figure 7 This is a structural diagram of the auxiliary disassembly and assembly mechanism of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the tensioning assembly and the driving assembly of the present invention;

[0027] Figure numerals: 1-mounting sleeve, 11-connecting head, 12-opening, 13-first strip groove, 14-mounting platform, 2-elastic expansion cylinder, 21-second strip groove, 22-conical surface, 3-sandpaper, 4-pressing member, 41-pressing piece, 411-opening rod, 4111-conical portion, 42-positioning screw, 421-head, 422-protrusion, 5-expansion mechanism, 51-support ring, 52-opening block, 53-limiting block, 54-shrinking ring, 6-working table, 61-rotating disk, 62-rotating Driving mechanism, 7-mounting seat, 71-tightening bolt, 8-grinding seat, 81-driving electric cylinder, 82-moving plate, 83-grinding motor, 84-driving shaft, 9-auxiliary disassembly and assembly mechanism, 91-support rod, 92-support seat, 93-magnetic block, 932-arc rib, 94-tensioning assembly, 941-mounting plate, 942-tensioning rod, 9421-arc chamfer, 943-driving block, 9431-inclined surface, 95-driving assembly, 951-driving ring, 952-driving screw, 953-rotating seat. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0030] Example 1

[0031] The following reference Figure 1-Figure 4 As shown, further described in conjunction with specific embodiments, this embodiment provides a grinding head, referring to Figure 1 、 Figure 2 As shown, it includes a mounting sleeve 1, an elastic expansion sleeve 2, grinding sandpaper 3 and a pressing member 4. One end of the mounting sleeve 1 is provided with a connector 11 for connecting to the power end of the grinding device, and the other end is provided with an opening 12. A first strip groove 13 is provided on the side wall of the mounting sleeve 1 that passes through the opening 12; the elastic expansion sleeve 2 can be placed in the mounting sleeve 1 and fits with the mounting sleeve 1, and the elastic expansion sleeve 2 has a second strip groove 21; the grinding sandpaper 3 is wound around the outside of the mounting sleeve 1, Both ends of the sandpaper 3 are inserted into the first strip groove 13 and can extend into the second strip groove 21; the pressing part 4 includes a pressing plate 41 and a positioning screw 42, and the pressing plate 41 is arranged on one side of the opening 12 end of the mounting sleeve 1; the positioning screw 42 is passed through the pressing plate 41, and the head 421 of the positioning screw 42 can press the pressing plate 41 onto the mounting sleeve 1. A mounting platform 14 is provided in the mounting sleeve 1, and a threaded hole matching the positioning screw 42 is provided on the mounting platform 14.

[0032] Reference Figure 2 As shown, the width of the sandpaper 3 is greater than the length of the first strip groove 13, and the pressing piece 41 presses against the end of the sandpaper 3 that extends out of the mounting sleeve 1. The side edge of the sandpaper 3 after winding is located outside the mounting sleeve 1. The portion located outside the mounting sleeve 1 is pressed against the end surface of the mounting sleeve 1, and the side edge of the sandpaper 3 is pressed against the end surface of the mounting sleeve 1 by the pressing piece 41, which can further improve the stability of the sandpaper 3 after installation.

[0033] When the sandpaper 3 needs to be installed on the mounting sleeve 1, the elastic expansion cylinder 2 is rotated so that the second strip groove 21 is aligned with the first strip groove 13, and then one end of the sandpaper 3 is passed through the first strip groove 13 and inserted into the second strip groove 21. After the sandpaper 3 is wound around the mounting sleeve 1 for one circle, the other end of the sandpaper 3 is passed through the first strip groove 13 and inserted into the second strip groove 21; the elastic expansion cylinder 2 and the mounting sleeve 1 are rotated relative to each other. Since the elastic expansion cylinder 2 has a tendency to open, it can drive the two ends of the sandpaper 3 to move between the gap between the elastic expansion cylinder 2 and the mounting sleeve 1, and finally the sandpaper 3 is tightly attached to the mounting sleeve 1; the side edge of the sandpaper 3 after winding is pressed against by the pressing plate 41, and the pressing plate 41 is fixed by connecting the positioning screw 42 to the threaded hole on the mounting platform 14. The entire installation process of the sandpaper 3 can be completed without bonding the sandpaper 3 to the installation sleeve 1 , thereby improving the replacement efficiency of the sandpaper 3 .

[0034] Reference Figure 2 、 Figure 3As shown, the mounting platform 14 is provided with an expansion mechanism 5 for expanding the elastic expansion tube 2 toward one end inside the mounting sleeve 1. The expansion mechanism 5 includes a support ring 51 and an expansion block 52 circumferentially arranged on the side wall of the support ring 51. The positioning screw 42 is provided with a protrusion 422 for driving the expansion block 52 to move outward from the support ring 51. During the process of connecting the positioning screw 42 to the mounting platform 14, the protrusion 422 can drive the expansion block 52 to move outward from the support ring 51, so that the elastic expansion tube 2 can further expand toward one end inside the mounting sleeve 1.

[0035] Reference Figure 3 、 Figure 4 As shown, a through groove is radially opened on the support ring 51, and the expansion block 52 is slidably set in the through groove and one end of the expansion block 52 extends to the inner ring of the support ring 51. A limit block 53 is set on the expansion block 52, and a limit groove connected to the through groove is opened on the end face of the support ring 51. The limit blocks 53 all extend to the outside of the end face of the support ring 51, and a shrinking ring 54 is set between the multiple limit blocks 53. The shrinking ring 54 can drive the multiple limit blocks 53 to move toward the center position of the support ring 51 at the same time, so that the limit blocks 53 will not apply resistance force to the elastic expansion tube 2 when not affected by external force.

[0036] Reference Figure 3 As shown, the compression plate 41 is provided with an expansion rod 411 for expanding the end of the elastic expansion tube 2 that faces outside the mounting sleeve 1. The end of the expansion rod 411 away from the compression plate 41 is provided with a tapered portion 4111 so that the expansion rod 411 can be easily inserted into the second strip groove 21. When the compression plate 41 is pressed against the end of the mounting sleeve 1, the expansion rod 411 is aligned with the second strip groove 21 and inserted to further expand the elastic expansion tube 2 toward the end outside the mounting sleeve 1. Under the combined action of the expansion rod 411 and the expansion mechanism 5, the elastic expansion tube 2 can be made to cling to the inner wall of the mounting sleeve 1 as a whole, thereby improving the positioning effect of the end of the sandpaper 3 and preventing the sandpaper 3 from sliding relative to the mounting sleeve 1 during the sanding process.

[0037] Example 2

[0038] Combine Figure 5-Figure 8 As shown, this embodiment provides a grinding device, including the grinding head in embodiment 1, referring to Figure 5As shown, the machine also includes a workbench 6, multiple mounting seats 7, a grinding seat 8, and an auxiliary disassembly and assembly mechanism 9. The workbench 6 is provided with a rotating disk 61 and a rotating mechanism 62 for driving the rotating disk 61 to rotate. In this embodiment, the rotating mechanism 62 uses a motor gear mechanism, and the bottom of the rotating disk 61 is provided with a gear ring that meshes with the gear. In other embodiments, a chain drive mechanism or a worm gear mechanism can also be used as the rotating mechanism 62. Multiple mounting seats 7 are evenly distributed on the rotating disk 61. The mounting seats 7 are provided with placement slots for placing workpieces. The sides of the mounting seats 7 are provided with tightening bolts 71 for tightening the workpiece. By placing the workpiece in the placement slot and tightening it with the tightening bolts 71, the workpiece position can be fixed, thereby preventing the workpiece from moving during the grinding process.

[0039] Reference Figure 5 、 Figure 6 As shown, the grinding seat 8 is rotatably mounted on the workbench 6 and is located outside the rotating disk 61. The grinding seat 8 is equipped with a driving electric cylinder 81. The piston rod of the driving electric cylinder 81 is connected to a movable plate 82. The movable plate 82 is provided with a grinding motor 83. The output shaft of the grinding motor 83 is coaxially connected to a drive shaft 84. The mounting sleeve 1 is detachably mounted on the drive shaft 84 via a connector 11. When grinding a workpiece, the grinding seat 8 is rotated so that the mounting sleeve 1 faces the workpiece. The driving electric cylinder 81 drives the movable plate 82 to move toward the workpiece. The grinding motor 83 is started to drive the mounting sleeve 1 to rotate. The grinding sandpaper 3 installed on the mounting sleeve 1 can then grind the workpiece. When the grinding sandpaper 3 needs to be replaced, the driving electric cylinder 81 drives the movable plate 82 to move away from the workpiece and the grinding seat 8 is rotated in the direction away from the workpiece. The staff can then easily remove the worn grinding sandpaper 3 and replace it with a new one.

[0040] Reference Figure 6As shown, the auxiliary disassembly and assembly mechanism 9 includes a support rod 91, which is rotatably mounted on the workbench 6. A support seat 92 is provided on the top of the support rod 91. One end of the support seat 92 is provided with a magnetic block 93 for attracting the clamping plate 41. A notch is provided on the magnetic block 93 for the head 421 of the positioning screw 42 to pass through. The other end of the support seat 92 is provided with a tensioning assembly 94 for tightening or expanding the elastic expansion cylinder 2. When the sandpaper 3 needs to be replaced, the head 421 of the positioning screw 42 is screwed to remove the positioning screw 42 from the mounting table 14, the support rod 91 is rotated and the magnetic block 93 is aligned with the mounting sleeve 1, and the movable plate 82 is driven to move in the direction close to the magnetic block 93 by the driving electric cylinder 81, so that the clamping piece 41 can be attracted to the magnetic block 93, and the driving electric cylinder 81 is started again to drive the movable plate 82 to move in the direction away from the magnetic block 93, so that the clamping piece 41 can drive the positioning screw 42 to separate from the mounting sleeve 1; the support rod 91 is rotated 180 degrees and the tensioning assembly 94 is aligned with the mounting sleeve 1, and the elastic expansion cylinder 2 is tightened by the tensioning assembly 94 first, so that Remove the worn sandpaper 3 and replace it with a new one; then expand the elastic expansion tube 2 through the tensioning assembly 94, start the sanding motor 83 to drive the mounting sleeve 1 to rotate, that is, the elastic expansion tube 2 and the mounting sleeve 1 can rotate relative to each other. In this process, the two ends of the sandpaper 3 located between the elastic expansion tube 2 and the mounting sleeve 1 can be moved, so that the part of the sandpaper 3 mounted on the mounting sleeve 1 is tightly attached to the mounting sleeve 1; rotate the support rod 91 180° again and align the magnetic block 93 with the mounting sleeve 1 to facilitate connecting the clamping plate 41 and the positioning screw 42 to the end of the mounting sleeve 1, thereby achieving further positioning of the sandpaper 3.

[0041] Reference Figure 7 、 Figure 8As shown, the tensioning assembly 94 includes a mounting plate 941, and a plurality of tensioning rods 942 are distributed circumferentially on the mounting plate 941. One end of the tensioning rod 942 is hinged on the mounting plate 941. The end of the elastic expansion cylinder 2 facing the outside of the mounting sleeve 1 is provided with a conical surface 22, and the end of the tensioning rod 942 away from the mounting plate 941 is provided with an arc chamfer 9421 that can be inserted into the conical surface 22. The setting of the arc chamfer 9421 and the conical surface can make it more convenient to insert the tensioning rod 942 into the end of the elastic expansion cylinder 2; the mounting plate 941 is provided with a driving assembly 95 for driving the plurality of tensioning rods 942 to simultaneously open in a direction away from each other or to simultaneously tighten in a direction close to each other. When it is necessary to drive the elastic expansion tube 2 to tighten in order to increase the gap between the elastic expansion tube 2 and the mounting sleeve 1, the tensioning rod 942 is inserted into the outer circumferential surface of the elastic expansion tube 2, and then the driving component 95 is used to drive multiple tensioning rods 942 to simultaneously approach each other, so that the elastic expansion tube 2 can be contracted and separated from the inner wall of the mounting sleeve 1; when it is necessary to drive the elastic expansion tube 2 to expand, the tensioning rod 942 is inserted into the inner circumferential surface of the elastic expansion tube 2, and then the driving component 95 is used to drive multiple tensioning rods 942 to simultaneously open in the direction of moving away from each other, so that the elastic expansion tube 2 can be pressed against the inner wall of the mounting sleeve 1.

[0042] Reference Figure 8 As shown, the drive assembly 95 includes a drive ring 951 and a drive screw 952. The drive screw 952 is threadedly connected to the mounting plate 941. A rotating seat 953 is provided in the middle of the drive ring 951, and the rotating seat 953 rotates with the drive screw 952. A plurality of drive grooves for the tensioning rod 942 to pass through are distributed circumferentially on the drive ring 951. Drive blocks 943 are provided on the tensioning rod 942 and on both sides of the drive ring 951. The two drive blocks 943 are respectively located on the two opposite sides of the tensioning rod 942. By rotating the drive screw 952, the drive ring 951 can be driven to move along the length of the drive screw 952. When the drive ring 951 moves toward one set of drive blocks 943, the multiple tensioning rods 942 can be rotated toward each other to drive the elastic expansion cylinder 2 to contract. When the drive ring 951 moves toward the other set of drive blocks 943, the multiple tensioning rods 942 can be moved away from each other to drive the elastic expansion cylinder 2 to expand. It should be noted that the thickness of the drive groove is greater than the thickness of the tensioning rod 942, so that the drive block 943 can enter the drive groove during the movement of the drive ring 951. The side of the drive block 943 away from the tensioning rod 942 is provided with an inclined surface 9431 to improve the smoothness of the drive block 943 entering the drive groove.

[0043] Reference Figure 7As shown, the bottom of the magnetic block 93 is provided with an arcuate rib 932, and the arcuate rib 932 and the mounting plate 941 are both arranged coaxially with the drive shaft 84. The arcuate rib 932 ensures that the position of the compression plate 41 will not shift after it is attracted to the magnetic block 93, so that the compression plate 41 can be aligned when it is reinstalled after being separated from the mounting sleeve 1. The coaxial arrangement of the mounting plate 941 and the drive shaft 84 ensures that the multiple tensioning rods 942 are evenly distributed along the circumference of the elastic expansion cylinder 2 when the elastic expansion cylinder 2 is tightened or expanded.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A grinding device, comprising a grinding head, the grinding head comprising: A mounting sleeve (1), wherein one end of the mounting sleeve (1) is provided with a connector (11) and the other end is provided with an opening (12), and a first strip-shaped groove (13) extending through the opening (12) is provided on a side wall of the mounting sleeve (1); An elastic expansion tube (2), the elastic expansion tube (2) can be placed in the installation sleeve (1) and fits closely with the installation sleeve (1), and the elastic expansion tube (2) has a second strip groove (21); A sandpaper (3) is wound around the outside of the mounting sleeve (1), and both ends of the sandpaper (3) are inserted into the first strip groove (13) and can extend into the second strip groove (21); A pressing piece (4), the pressing piece (4) includes a pressing plate (41) and a positioning screw (42), the pressing plate (41) is arranged on one side of the opening (12) end of the mounting sleeve (1); the positioning screw (42) is passed through the pressing plate (41), and the head (421) of the positioning screw (42) can press the pressing plate (41) onto the mounting sleeve (1), and a mounting platform (14) is provided in the mounting sleeve (1), and a threaded hole matching the positioning screw (42) is provided on the mounting platform (14); The mounting platform (14) is provided with an expansion mechanism (5) for expanding the elastic expansion cylinder (2) toward one end inside the mounting sleeve (1), the expansion mechanism (5) comprising a support ring (51) and an expansion block (52) circumferentially arranged on the side wall of the support ring (51), the positioning screw (42) is provided with a protrusion (422) for driving the expansion block (52) to move outward from the support ring (51); the pressing plate (41) is provided with an expansion rod (411) for expanding the one end of the elastic expansion cylinder (2) toward the outside of the mounting sleeve (1); It is characterized in that it further comprises: a workbench (6), wherein the workbench (6) is provided with a rotating disk (61) and a rotating mechanism (62) for driving the rotating disk (61) to rotate; A plurality of mounting seats (7), each of which is provided with a placement slot for placing a workpiece, and a side surface of each mounting seat (7) is provided with a tightening bolt (71) for tightening the workpiece; A grinding seat (8), the grinding seat (8) is rotatably arranged on the workbench (6) and is located outside the rotating disk (61), the grinding seat (8) is provided with a driving electric cylinder (81), the piston rod of the driving electric cylinder (81) is connected to a movable plate (82), the movable plate (82) is provided with a grinding motor (83), the output shaft of the grinding motor (83) is coaxially connected to a driving shaft (84), and the mounting sleeve (1) is detachably mounted on the driving shaft (84) through a connector (11); An auxiliary disassembly and assembly mechanism (9), the auxiliary disassembly and assembly mechanism (9) includes a support rod (91), the support rod (91) is rotatably arranged on a workbench (6), a support seat (92) is arranged on the top of the support rod (91), one end of the support seat (92) is provided with a magnetic block (93) for attracting the pressing plate (41), and the other end of the support seat (92) is provided with a tensioning assembly (94) for tightening or expanding the elastic expansion cylinder (2).

2. The grinding device according to claim 1, characterized in that: A through groove is radially provided on the support ring (51), the expansion block (52) is slidably arranged in the through groove and one end of the expansion block (52) extends to the inner ring of the support ring (51), a limiting block (53) is provided on the expansion block (52), and a limiting groove connected to the through groove is provided on the end face of the support ring (51), and the limiting blocks (53) all extend to the outside of the end face of the support ring (51), and a shrinking ring (54) is provided between the plurality of limiting blocks (53), and the shrinking ring (54) can drive the plurality of limiting blocks (53) to move toward the center position of the support ring (51) at the same time.

3. The grinding device according to claim 1, characterized in that: A conical portion (4111) is provided at one end of the expansion rod (411) away from the compression plate (41). When the expansion rod (411) is inserted into the second strip groove (21), the elastic expansion cylinder (2) can expand to press against the inner wall of the mounting sleeve (1).

4. The grinding device according to claim 1, characterized in that: The width of the grinding sandpaper (3) is greater than the length of the first strip groove (13), and the pressing piece (41) is pressed against the end of the grinding sandpaper (3) extending out of the mounting sleeve (1).

5. The grinding device according to claim 1, characterized in that: The tensioning assembly (94) includes a mounting plate (941), and a plurality of tensioning rods (942) are distributed circumferentially on the mounting plate (941). One end of each tensioning rod (942) is hingedly mounted on the mounting plate (941). The end of the elastic expansion cylinder (2) facing the outside of the mounting sleeve (1) is provided with a conical surface (22), and the end of the tensioning rod (942) away from the mounting plate (941) is provided with an arc chamfer (9421) capable of being inserted into the conical surface (22). The mounting plate (941) is provided with a driving assembly (95) for driving the plurality of tensioning rods (942) to simultaneously open in a direction away from each other or to simultaneously tighten in a direction close to each other.

6. The grinding device according to claim 5, characterized in that: The driving assembly (95) comprises a driving ring (951) and a driving screw (952), wherein the driving screw (952) is threadedly connected to the mounting plate (941), and a rotating seat (953) is provided in the middle of the driving ring (951), and the rotating seat (953) is rotatably matched with the driving screw (952); a plurality of driving grooves for the tensioning rod (942) to pass through are distributed circumferentially on the driving ring (951), and driving blocks (943) are provided on both sides of the tensioning rod (942) and the driving ring (951), and the two driving blocks (943) are respectively located on two opposite sides of the tensioning rod (942).

7. The grinding device according to claim 6, characterized in that: The thickness of the driving groove is greater than the thickness of the tensioning rod (942), and the side of the driving block (943) away from the tensioning rod (942) is provided with an inclined surface (9431).

8. The grinding device according to claim 1, characterized in that: The magnetic block (93) is provided with a notch for the head (421) of the positioning screw (42) to pass through.

9. The grinding device according to claim 5, characterized in that: The bottom of the magnetic block (93) is provided with an arc-shaped rib (932), and the arc-shaped rib (932) and the mounting plate (941) are both coaxially arranged with the drive shaft (84).

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