An external cylindrical grinding clamping device

Abstract

The present application relates to an external cylindrical grinding clamping device, belonging to the technical field of fixtures. It includes a chuck body, a clamping member, and a driving disk. The chuck body is sleeved on the center drill. The clamping member is slidably mounted on the chuck body along the radial direction of the center drill. At least three clamping members are provided, and a plurality of the clamping members are evenly arranged at intervals along the circumferential direction of the center drill on the chuck body. The driving disk is rotatably mounted on the chuck body, and the driving disk drives the plurality of clamping members to move synchronously. The present application has the effect of improving the concentric accuracy between the workpiece and the center drill.

Description

Technical Field

[0001] This application relates to the field of fixtures, and particularly to an external grinding clamping device. Background Art

[0002] An external grinding machine is a machine tool for machining the outer surface of a workpiece. Before machining, the workpiece needs to be clamped and positioned by a fixture to prevent it from flying or shifting during the machining process. Currently, the most commonly used fixture is a dog clutch fixture, which includes a chuck ring, two clamping bolts spaced apart on the chuck ring, and a clamping handle eccentrically rotatably mounted on the chuck ring. When in use, one side of the workpiece is inserted into the chuck ring, and then the operator adjusts the two clamping bolts to achieve the preliminary positioning of the workpiece and make the workpiece concentric with the center drill. Subsequently, the workpiece is finally clamped by the clamping handle.

[0003] Regarding the above related technology, the inventor believes that when clamping and positioning workpieces of different diameters, it is impossible for the operator to fully ensure that the lengths of the two clamping bolts extending into the chuck ring are the same when adjusting the clamping bolts, thereby reducing the accuracy of the concentricity between the workpiece and the center drill. Summary of the Invention

[0004] In order to improve the accuracy of the concentricity between the workpiece and the center drill, this application provides an external grinding clamping device.

[0005] An external grinding clamping device provided by this application adopts the following technical solution:

[0006] An external grinding clamping device includes a chuck body, a clamping member, and a driving disk. The chuck body is sleeved on the center drill. The clamping member is slidably mounted on the chuck body along the radial direction of the center drill. At least three clamping members are provided, and a plurality of the clamping members are evenly spaced along the circumferential direction of the chuck body. The driving disk is rotatably mounted on the chuck body, and the driving disk drives a plurality of the clamping members to move synchronously.

[0007] By adopting the above technical solution, the chuck body will be installed on the machine tool together with the center drill. When installing workpieces of different diameters, the driving disk is rotated with the center drill as the rotation axis. At this time, a plurality of clamping members move along the radial direction of the center drill to place the workpiece between the plurality of clamping members, and then the driving disk is rotated in the reverse direction to make the plurality of clamping members approach each other along the radial direction of the center drill to clamp the workpiece.

[0008] When the driving disk rotates, multiple clamping members all move synchronously under the action of the driving disk, thus ensuring that the moving distances of the multiple clamping members are the same. At the same time, when the driving disk rotates, it rotates with the center pin as the rotation axis, and the clamping members move radially with respect to the center pin. Therefore, no matter where the multiple clamping members move to, the multiple clamping members are all located on the concentric circles centered on the center pin, thereby improving the accuracy of the workpiece being concentric with the center pin when clamping the workpiece.

[0009] Optionally, the chuck body is provided with sliding grooves for the clamping members to slide, the driving disk is provided with arc-shaped driving grooves, a part of the clamping members is located in the arc-shaped driving grooves and a part is located in the sliding grooves, and the clamping members move closer to or away from the center pin as the driving disk rotates.

[0010] By adopting the above technical solution, when the driving disk rotates, the arc-shaped driving grooves will drive the part of the clamping members located in the arc-shaped grooves to move along the extending direction of the arc-shaped grooves. However, part of the clamping members is still limited in the sliding grooves, so the clamping members slide along the extending direction of the sliding grooves, that is, the radial direction of the center pin, under the drive of the arc-shaped driving grooves of the driving disk, thereby enabling the clamping members to move relatively stably along the radial direction of the center pin when moving.

[0011] Optionally, the chuck body includes a clamping seat, a rotating seat, a center pin sleeve and a floating assembly. The center pin sleeve is sleeved on the center pin, the rotating seat is sleeved on the center pin sleeve and is rotatably connected to the center pin sleeve, the clamping seat is sleeved on the rotating seat and rotates synchronously with the rotating seat. The sliding grooves are arranged on the clamping seat. There is a floating gap between the clamping seat and the rotating seat, and the floating assembly enables the clamping seat to float in the floating gap to ensure the concentricity of the workpiece and the center pin.

[0012] By adopting the above technical solution, the center pin sleeve does not rotate, and the rotating seat and the clamping seat will rotate synchronously with the center pin sleeve as the rotation axis. If the workpiece has a slight eccentricity when being clamped, during machining, after the workpiece touches the machining tool, it will float in the floating gap under the action of the floating assembly. Since the machining tool is fixed, and the workpiece and the chuck body rotate with the center pin as the rotation axis, during machining, the floating of the clamping seat can improve the concentricity of the workpiece and the center pin during machining. If there is no floating assembly and floating gap, and the workpiece has an eccentricity when being clamped, the machined product will also be eccentric.

[0013] Optionally, the floating components are arranged on the clamping seat, and at least three floating components are provided. The multiple floating components are evenly arranged at intervals in the circumferential direction of the rotating seat. The floating component includes a floating block and a driving spring. The floating block slides radially along the thimble within the floating gap, and the driving spring drives the floating block to always abut against the rotating seat.

[0014] By adopting the above technical solution, the driving spring drives the floating block to always abut against the rotating seat. When the workpiece rotates, if the workpiece is eccentric, the eccentric outer wall of the workpiece will collide with the machining tool. At this time, the clamping seat will drive the workpiece to move towards the side of the floating gap away from the machining tool, and then the corresponding floating block will squeeze the driving spring to make way, so as to improve the concentricity between the workpiece and the thimble during machining.

[0015] Optionally, the floating component further includes an adjusting setscrew. A floating groove for the floating block to slide is formed on the outer wall of the clamping seat. The adjusting setscrew is threadedly installed in the floating groove. The driving spring is located between the floating block and the adjusting setscrew, and the driving spring is in a compressed state.

[0016] By adopting the above technical solution, the floating block slides in the floating groove, increasing the contact area between the floating block and the clamping seat. At the same time, the floating block can slide directionally under the guidance of the floating groove, and thus the floating block is more stable when sliding. In addition, the compression degree of the driving spring can be adjusted by the adjusting setscrew, and then the magnitude of the top force of the floating block abutting against the rotating seat can be adjusted, reducing the risk that the force of the floating block hitting the rotating seat is too large during machining of the workpiece and the workpiece damages the machining tool due to eccentricity.

[0017] Optionally, the clamping member includes a sliding block and a sliding cylinder. The sliding cylinder is located on the side of the sliding block close to the driving disk. The sliding cylinder is inserted into the arc-shaped driving groove and slides in the arc-shaped driving groove. The sliding block slides in the sliding groove.

[0018] By adopting the above technical solution, since the arc-shaped driving groove is a groove with a curvature, if a column with an edge is slid in the arc-shaped driving groove, there is a risk of jamming. Therefore, the part that slides in the arc-shaped driving groove is set as a sliding cylinder, reducing the risk of jamming during the sliding of the clamping member. And the sliding block has a larger contact area with the clamping seat in the sliding groove than a circular cylinder, so it is more stable when sliding in the sliding groove.

[0019] Optionally, an eccentric handle is rotatably connected to one of the sliding cylinders, and clamping columns are provided on the remaining sliding cylinders.

[0020] By adopting the above technical solution, the clamping posts and the eccentric handles will move synchronously with the clamping member. After multiple clamping posts and eccentric handles abut against the outer surface of the workpiece, the eccentric handle is rotated to clamp and limit the workpiece. The setting of the clamping posts reduces the risk of the driving disc axially falling off the clamping seat along the ejector rod on the one hand, and increases the length of the sliding cylinder protruding from the driving disc on the other hand, so that the workpiece is more stable after being clamped.

[0021] Optionally, the chuck body further includes an axial limiting component. A limiting ring groove is provided on the outer wall of the ejector sleeve. The axial limiting component is installed on the rotating seat and inserted into the limiting ring groove.

[0022] By adopting the above technical solution, after the rotating seat is sleeved on the ejector sleeve, the axial limiting component can be inserted into the limiting ring groove to axially limit the rotating seat. At the same time, after the axial limiting component is inserted into the limiting ring groove, it does not affect the rotation of the rotating seat.

[0023] Optionally, the axial limiting component includes a limiting post. An insertion slot communicating with the limiting ring groove is provided on the outer wall of the rotating seat. The limiting post is partially located in the insertion slot and partially located in the limiting ring groove.

[0024] By adopting the above technical solution, during installation, the rotating seat is first sleeved on the ejector sleeve, and then the limiting post is inserted into the limiting slot through the insertion slot, which realizes the axial limiting installation of the rotating seat. When installing the rotating seat, the limiting post does not interfere.

[0025] Optionally, the axial limiting component further includes a compression spring and an adjusting bolt. The limiting post is slidably installed in the insertion slot. The adjusting bolt is threadedly installed in the insertion slot. The compression spring is located between the adjusting bolt and the limiting post, and the compression spring drives the limiting post to abut against the bottom of the limiting ring groove.

[0026] By adopting the above technical solution, the compression spring drives the limiting post to be always inserted into the limiting slot, so that the circumferential limiting of the rotating seat is more stable. Since the rotating seat itself is rotatably installed on the ejector sleeve, when the eccentric handle is rotated to loosen the workpiece, the driving rotating seat and the driving plate rotate synchronously and cannot be loosened. Therefore, the adjusting bolt can be used to increase the top force of the limiting post abutting against the ejector sleeve, increase the friction force of the rotating seat when rotating by the limiting post, and thus reduce the risk of the workpiece and the rotating seat rotating synchronously.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] When the driving disk rotates, the arc-shaped driving groove drives the part of the clamping member located in the arc-shaped groove to move along the extending direction of the arc-shaped groove. However, part of the clamping member is still located in the sliding groove and is limited. Therefore, multiple clamping members synchronously slide radially along the thimble under the drive of the arc-shaped driving groove of the driving disk, and the moving distances of the multiple clamping members are the same, thus ensuring the concentricity with the thimble when clamping the workpiece;

[0029] When the workpiece rotates, if the workpiece is eccentric, the eccentric outer wall of the workpiece will collide with the machining tool. At this time, the clamping seat will drive the workpiece to move towards the side of the floating gap away from the machining tool, and then the corresponding floating block will squeeze the driving spring to make way, so as to improve the concentricity of the workpiece with the thimble during machining;

[0030] Inserting the limiting post into the limiting ring groove can, on the one hand, axially limit the rotating seat on the thimble sleeve, and on the other hand, by adjusting the adjusting bolt, the pressing force of the limiting post against the thimble sleeve can be increased, increasing the friction force of the rotating seat when rotating against the limiting post, and thus reducing the risk of the workpiece and the rotating seat rotating synchronously when loosening the eccentric handle. Description of the Drawings

[0031] Figure 1 is the installation schematic diagram of the overall external cylindrical grinding clamping device and the thimble in the embodiment of the present application.

[0032] Figure 2 is the overall exploded view of the external cylindrical grinding clamping device in the embodiment of the present application.

[0033] Figure 3 is the installation structure schematic diagram of the clamping seat and the clamping member in the embodiment of the present application.

[0034] Figure 4 is the cross-sectional view at the position of the floating component in the embodiment of the present application.

[0035] Figure 5 is the cross-sectional view at the position of the axial limiting component in the embodiment of the present application.

[0036] Description of reference numerals: 1. chuck body; 11. clamping seat; 111. mounting plate; 112. clamping block; 113. clamping rotating hole; 114. sliding groove; 1141. moving groove; 1142. limiting groove; 115. floating groove; 1151. placement groove; 1152. penetration hole; 116. countersunk hole; 12. rotating seat; 121. rotating base; 1211. threaded hole; 1212. sleeve rotating hole; 1213. insertion groove; 122. clamping ring; 123. partition ring; 13. ejector sleeve; 13 1. Limiting ring groove; 14. Floating assembly; 141. Floating block; 1411. Floating part; 1412. Limiting part; 142. Driving spring; 143. Adjusting top screw; 15. Axial limiting assembly; 151. Limiting column; 152. Compression spring; 153. Adjusting bolt; 2. Clamping piece; 21. Sliding block; 211. First sliding part; 212. Second sliding part; 22. Sliding cylinder; 23. Eccentric handle; 24. Clamping column; 3. Driving disk; 31. Driving rotating hole; 32. Arc-shaped driving groove; 4. Floating gap. DETAILED DESCRIPTION

[0037] The following is combined with Figures 1-5 This application is described in further detail.

[0038] The present application embodiment discloses a cylindrical grinding clamping device. Figure 1 The cylindrical grinding clamping device comprises a chuck body 1, a clamping member 2 and a driving disk 3. The chuck body 1 is sleeved on the ejector pin, and a plurality of clamping members 2 are provided, and the plurality of clamping members 2 are all slidably mounted on the chuck body 1 along the radial direction of the ejector pin. The driving disk 3 is rotatably mounted on the chuck body 1 with the ejector pin as the rotating axis, and the driving disk 3 is rotated, and the driving disk 3 drives the plurality of clamping members 2 to synchronously move along the radial direction of the ejector pin.

[0039] Reference Figure 1 and Figure 2 The chuck body 1 includes a clamping seat 11, a rotating seat 12, an ejector sleeve 13, a floating assembly 14, and an axial limit assembly 15. The clamping seat 11 is located on one side of the rotating seat 12 along the axial direction of the ejector and is sleeved on the rotating seat 12. The floating assembly 14 can allow a certain amount of floating between the clamping seat 11 and the rotating seat 12, thereby ensuring the concentricity of the workpiece and the ejector when processing the workpiece. The rotating seat 12 is sleeved on the ejector sleeve 13, and the rotating seat 12 is rotatably installed on the ejector sleeve 13 with the ejector sleeve 13 as the rotation axis. The axial limit assembly 15 limits the axial direction of the rotating seat 12 on the ejector sleeve 13. The ejector sleeve 13 is sleeved on the ejector and is fixedly connected to the ejector.

[0040] Reference Figure 2 and Figure 3The clamping seat 11 includes a mounting plate 111 and a clamping block 112 located on one side of the mounting plate 111 and sleeved on the rotating seat 12. A circular clamping rotating hole 113 for the ejector to pass through is provided at the middle of the mounting plate 111, and the central axis of the clamping rotating hole 113 coincides with the central axis of the ejector. A sliding groove 114 for the clamping member 2 to slide is provided on the outer wall of the mounting plate 111, and the extending direction of the sliding groove 114 is consistent with the radial direction of the clamping rotating hole 113, and the sliding groove 114 is connected to the clamping rotating hole 113.

[0041] Reference Figure 2 and Figure 3 The sliding groove 114 includes a moving groove 1141 and a limiting groove 1142. The limiting groove 1142 is formed on the groove wall of the moving groove 1141 on the side away from the rotating seat 12, and the limiting groove 1142 passes through the mounting plate 111. The diameter of the limiting groove 1142 is smaller than that of the sliding groove 114, so that the clamping member 2 is limited in the moving groove 1141 along the axial direction of the clamping rotating hole 113, but does not affect the sliding of the clamping member 2 in the moving groove 1141.

[0042] The clamping member 2 includes a sliding block 21 and a sliding cylinder 22. The sliding block 21 slides in the sliding groove 114. The sliding cylinder 22 is located on the side of the sliding block 21 away from the rotating seat 12 and is integrally formed with the sliding block 21. The sliding block 21 includes a first sliding portion 211 and a second sliding portion 212. The second sliding portion 212 is located on the side of the first sliding portion 211 close to the sliding cylinder 22. The projection of the first sliding portion 211 along the extension direction of the sliding cylinder 22 is located outside the projection of the second sliding portion 212 along the extension direction of the sliding cylinder 22. The first sliding portion 211 slides in the moving groove 1141, and the second sliding portion 212 slides in the limiting groove 1142. Then, the limiting groove 1142 limits the first sliding portion 211, thereby reducing the risk of the first sliding portion 211 escaping from the moving groove 1141 along the extension direction of the sliding cylinder 22. The sliding cylinder 22 protrudes from the sliding groove 114 and cooperates with the driving disk 3.

[0043] At least three clamping members 2 are provided, and three or more clamping members 2 are provided and are evenly distributed at intervals in the circumferential direction of the clamping rotation hole 113 on the mounting plate 111. In this embodiment, three clamping members 2 are preferably provided.

[0044] Reference Figure 2, the driving disk 3 is located on the side of the mounting disk 111 away from the clamping block 112. A driving rotation hole 31 is formed in the driving disk 3 for one side of the ejector pin to pass through and is concentric with the clamping rotation hole 113. An arc-shaped driving groove 32 for inserting the sliding cylinder 22 is formed in the driving disk 3. The concave portion of the arc-shaped driving groove 32 faces the driving rotation hole 31, and the distance from the center of the circle of one end wall of the arc-shaped driving groove 32 to the center of the driving rotation hole 31 is greater than the distance from the center of the circle of the other end wall of the arc-shaped driving groove 32 to the center of the driving rotation hole 31, that is, one end of the arc-shaped driving groove 32 gradually moves away from the center of the driving rotation hole 31. Since three clamping members 2 are provided in this embodiment, three arc-shaped driving grooves 32 are also provided, and the three arc-shaped driving grooves 32 correspond to the three clamping members 2 one by one.

[0045] Refer to Figure 2 and Figure 3 , after the sliding cylinder 22 is inserted into the arc-shaped driving groove 32, the side away from the sliding block 21 protrudes from the arc-shaped sliding groove 114. Further, when the driving disk 3 rotates with the ejector pin as the rotation axis, the driving disk 3 drives the sliding cylinder 22 to move along the extending direction of the arc-shaped sliding groove 114, and at the same time, the sliding block 21 can only slide radially along the ejector pin under the limitation of the sliding groove 114. It should be noted that when the sliding cylinder 22 is located at the end of the arc-shaped driving groove 32 away from the center of the driving rotation hole 31, the sliding block 21 is still located in the sliding groove 114.

[0046] An eccentric handle 23 is sleeved on one of the plurality of sliding cylinders 22, and the eccentric handle 23 rotates with the corresponding sliding cylinder 22 as the rotation axis. One side of the eccentric handle 23 is provided with an abutting arc surface, and the center of the abutting arc surface is not concentric with the center of the corresponding sliding cylinder 22. Clamping columns 24 are sleeved and installed on the remaining sliding cylinders 22 through bolts. The clamping columns 24 are cylinders, and the clamping columns 24 are concentric with the sliding cylinders 22. The diameter of the clamping column 24 is larger than the diameter of the sliding cylinder 22, and the clamping column 24 extends toward the side away from the driving disk 3.

[0047] During installation, one side of the workpiece is placed between the plurality of clamping columns 24, then the driving disk 3 is rotated so that the plurality of clamping columns 24 all abut against the outer wall of the workpiece, and finally the eccentric handle 23 is rotated to clamp and fix the workpiece.

[0048] Refer to Figure 3 , the clamping block 112 is arranged on the side of the mounting disk 111 close to the rotating seat 12, and the clamping block 112 is integrally formed with the mounting disk 111. At least three clamping blocks 112 are provided. When three or more clamping blocks 112 are provided, they are evenly arranged circumferentially around the clamping rotation hole 113. In this embodiment, three clamping blocks 112 are preferably provided.

[0049] Refer to Figure 2 and Figure 4, there is a floating gap 4 between the clamping block 112 and the outer wall of the rotating base 12. The floating component 14 drives the clamping block 112 to float within the floating gap 4, thereby improving the concentricity between the workpiece and the center pin during machining. The floating component 14 can be arranged on the clamping block 112 or on the rotating base 12. In this embodiment, it is preferably arranged on the clamping block 112. Since there are three clamping blocks 112, there are also three groups of floating components 14, and the three groups of floating components 14 correspond to the three clamping blocks 112 one by one. A floating groove 115 for installing the floating component 14 is formed on the outer wall of the clamping block 112, and the floating component 14 slides along the radial direction of the center pin within the floating groove 115.

[0050] The floating component 14 includes a floating block 141, a driving spring 142 and an adjusting set screw 143. The floating groove 115 includes a placement groove 1151 and a through hole 1152. The through hole 1152 is located at the bottom of the placement groove 1151, and the through hole 1152 penetrates through the clamping block 112 and communicates with the floating gap 4. In this embodiment, it is preferably that the placement groove 1151 is a circular groove and the through hole 1152 is a circular hole. The diameter of the through hole 1152 is smaller than the diameter of the placement groove 1151. Taking the floating block 141 as a circular cylinder as an example, the floating block 141 includes a floating portion 1411 and a limiting portion 1412. The outer diameter of the limiting portion 1412 is larger than the outer diameter of the floating portion 1411, and the outer diameter of the floating portion 1411 is larger than the diameter of the through hole 1152. Among them, the limiting portion 1412 is located within the placement groove 1151, the floating portion 1411 is inserted into the through hole 1152 and protrudes from the through hole 1152 to abut against the rotating base 12. The adjusting set screw 143 is installed at the mouth of the placement groove 1151 by means of a thread. One end of the driving spring 142 located within the placement groove 1151 abuts against the adjusting set screw 143, and the other end abuts against the limiting portion 1412 of the floating block 141, and the driving spring 142 is in a compressed state.

[0051] In another implementation manner, the adjusting set screw 143 and the floating groove 115 may not be provided, and the driving spring 142 and the driving block are directly arranged within the floating gap 4, that is, the driving spring 142 is fixedly installed on one side of the clamping block 112 close to the outer wall of the rotating base 12, and the floating block 141 is fixedly installed at the other end of the driving spring 142.

[0052] Refer to Figure 2 And Figure 3, on the side of the mounting disk 111 facing away from the clamping block 112, at least two counterbore holes 116 are provided. On the side of the rotating seat 12 close to the mounting disk 111, threaded holes 1211 are provided, the number of which is the same as that of the counterbore holes 116. The threaded holes 1211 correspond to the counterbore holes 116 one by one, and the threaded holes 1211 are concentric with the counterbore holes 116. The threaded end of the bolt passes through the counterbore hole 116 and is threadedly installed in the threaded hole 1211. And due to the existence of the floating gap 4, the outer diameter of the threaded column of the bolt is smaller than the aperture of the small hole of the counterbore hole 116.

[0053] The rotating seat 12 includes a rotating base 121 and a clamping ring 122. The clamping ring 122 is located on the side of the rotating base 121 close to the clamping block 112, and a plurality of clamping blocks 112 are sleeved on the clamping ring 122. The floating block 141 abuts against the outer wall of the clamping ring 122. A sleeve rotating hole 1212 concentric with and communicating with the clamping ring 122 is provided on the rotating seat 12. A partition ring 123 is arranged in the sleeve rotating hole 1212, and the central axis of the partition ring 123 coincides with the central axis of the sleeve rotating hole 1212. Rotating bearings are installed on both sides of the partition ring 123, and the rotating bearings are sleeved on the thimble sleeve 13.

[0054] Refer to Figure 2 And Figure 5 , the axial limiting component 15 is installed on the rotating base 121. The axial limiting component 15 includes a limiting column 151, a compression spring 152 and an adjusting bolt 153. An annular limiting ring groove 131 is provided on the outer wall of the thimble sleeve 13, and the limiting ring groove 131 is located at the position of the partition ring 123 on the thimble sleeve 13. An insertion groove 1213 is provided on the outer wall of the rotating base 121, and the insertion groove 1213 penetrates through the rotating base 121 along the radial direction of the partition ring 123 and communicates with the limiting ring groove 131. The limiting column 151 is inserted into the insertion groove 1213, the adjusting bolt 153 is threadedly installed at the notch of the insertion groove 1213, the compression spring 152 is located in the insertion groove 1213, and one end of the compression spring 152 abuts against the adjusting bolt 153 and the other end abuts against the limiting column 151. The compression spring 152 is in a compressed state in the insertion groove 1213. Furthermore, the limiting column 151 is partially located in the insertion groove 1213 and partially inserted into the limiting ring groove 131 and abuts against the thimble sleeve 13 under the drive of the compression spring 152.

[0055] The implementation principle of the external cylindrical grinding clamping device in the embodiment of the present application is as follows: rotate the driving disk 3, and a plurality of clamping members 2 synchronously slide along the radial direction of the thimble under the cooperation of the arc-shaped driving groove 32 and the sliding groove 114. Then, one side of the workpiece is placed between the plurality of clamping members 2, and the driving disk 3 is rotated in the reverse direction so that a plurality of clamping columns 24 all abut against the outer wall of the workpiece. Finally, the eccentric handle 23 is rotated to clamp and position the workpiece.

[0056] During the process of the clamping plate body driving the clamped workpiece to rotate for processing, if the workpiece is eccentric, the eccentric side of the workpiece will impact the processing tool, causing the clamping seat 11 to drive the workpiece to move to the opposite side. At this time, the corresponding floating block 141 is squeezed and moves into the floating groove 115, enabling the workpiece to maintain concentricity during processing.

[0057] When the workpiece needs to be removed after the processing is completed, rotate the eccentric handle 23 to loosen the workpiece. However, since the clamping seat 11 and the rotating seat 12 are connected by bolts, and the rotating seat 12 is rotatably installed on the thimble sleeve 13. Therefore, when the friction between the rotating seat 12 and the thimble sleeve 13 is small, when the eccentric handle 23 is rotated, the rotating seat 12 will rotate synchronously, causing the workpiece to rotate synchronously and making it difficult to disassemble. At this time, the adjusting bolt 153 can be screwed to increase the pressure of the compression spring 152 on the limit post 151, making the limit post 151 press more tightly against the thimble sleeve 13, thereby increasing the friction between the thimble sleeve 13 and the rotating seat 12. Then, when the eccentric handle 23 is rotated again, the risk of synchronous rotation between the rotating seat 12 and the eccentric handle 23 is reduced.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An external cylindrical grinding clamping device, characterized in that: It includes a chuck body (1), a clamping member (2) and a driving disk (3). The chuck body (1) is sleeved on the center pin. The clamping member (2) is slidably mounted on the chuck body (1) along the radial direction of the center pin. At least three clamping members (2) are provided, and a plurality of the clamping members (2) are evenly arranged at intervals along the circumferential direction of the chuck body (1) around the center pin. The driving disk (3) is rotatably mounted on the chuck body (1), and the driving disk (3) drives a plurality of the clamping members (2) to move synchronously. A sliding groove (114) for the clamping member (2) to slide is provided on the chuck body (1). An arc-shaped driving groove (32) is formed on the driving disk (3). A part of the clamping member (2) is located in the arc-shaped driving groove (32) and a part is located in the sliding groove (114), and the clamping member (2) moves closer to or away from the center pin as the driving disk (3) rotates. The chuck body (1) includes a clamping seat (11), a rotating seat (12), a center pin sleeve (13) and a floating assembly (14). The center pin sleeve (13) is sleeved on the center pin. The rotating seat (12) is sleeved on the center pin sleeve (13) and is rotatably connected to the center pin sleeve (13). The clamping seat (11) is sleeved on the rotating seat (12) and rotates synchronously with the rotating seat (12). The sliding groove (114) is provided on the clamping seat (11). A floating gap (4) is provided between the clamping seat (11) and the rotating seat (12). The floating assembly (14) enables the clamping seat (11) to float in the floating gap (4) so as to ensure the concentricity between the workpiece and the center pin.

2. The external cylindrical grinding clamping device according to claim 1, characterized in that: The floating assembly (14) is provided on the clamping seat (11), and at least three floating assemblies (14) are provided. A plurality of the floating assemblies (14) are evenly arranged at intervals along the circumferential direction of the rotating seat (12). The floating assembly (14) includes a floating block (141) and a driving spring (142). The floating block (141) slides in the floating gap (4) along the radial direction of the center pin. The driving spring (142) drives the floating block (141) to always abut against the rotating seat (12).

3. The external cylindrical grinding clamping device according to claim 2, characterized in that: The floating assembly (14) further includes an adjusting screw (143). A floating groove (115) for the floating block (141) to slide is formed on the outer wall of the clamping seat (11). The adjusting screw (143) is threadedly mounted in the floating groove (115). The driving spring (142) is located between the floating block (141) and the adjusting screw (143), and the driving spring (142) is in a compressed state.

4. The external cylindrical grinding clamping device according to claim 1, characterized in that: The clamping member (2) includes a sliding block (21) and a sliding cylinder (22). The sliding cylinder (22) is located on the side of the sliding block (21) close to the driving disk (3). The sliding cylinder (22) is inserted into the arc-shaped driving groove (32) and slides in the arc-shaped driving groove (32). The sliding block (21) slides in the sliding groove (114).

5. The external cylindrical grinding clamping device according to claim 4, characterized in that: An eccentric handle (23) is rotatably connected to one of the sliding cylinders (22), and clamping columns (24) are arranged on the remaining sliding cylinders (22).

6. The external cylindrical grinding clamping device according to claim 1, characterized in that: The chuck body (1) further includes an axial limiting component (15). A limiting ring groove (131) is formed on the outer wall of the thimble sleeve (13). The axial limiting component (15) is installed on the rotating seat (12) and inserted into the limiting ring groove (131).

7. An outer circle grinding clamping device according to claim 6, characterized in that: The axial limiting component (15) includes a limiting column (151). An insertion groove (1213) communicating with the limiting ring groove (131) is formed on the outer wall of the rotating seat (12). Part of the limiting column (151) is located in the insertion groove (1213), and part of it is located in the limiting ring groove (131).

8. An external cylindrical grinding clamping device according to claim 7, characterized in that: The axial limiting component (15) further includes a compression spring (152) and an adjusting bolt (153). The limiting column (151) is slidably installed in the insertion groove (1213). The adjusting bolt (153) is threadedly installed in the insertion groove (1213). The compression spring (152) is located between the adjusting bolt (153) and the limiting column (151), and the compression spring (152) drives the limiting column (151) to abut against the bottom of the limiting ring groove (131).

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