Automatic positioning and clamping device for numerical control machine tool

Abstract

The utility model discloses an automatic positioning and clamping device for a numerical control machine tool, which relates to the technical field of machine tool processing, and comprises a three-jaw chuck and a workpiece, the three-jaw chuck is provided with a plurality of clamping jaws for clamping the workpiece, one end of each clamping jaw close to the axis of the three-jaw chuck is provided with a pressure blocking plate in a sliding manner, and the pressure blocking plate is contacted with the workpiece. A positioning clamping strip is fixedly installed on one side of the clamping jaw, a plurality of limiting grooves are formed in the positioning clamping strip, a sliding strip is installed on the clamping jaw in a sliding mode, a positioning rotary knob is installed at the end, away from the fixing sleeve, of the sliding strip in a threaded mode, and a clamping protruding block is rotatably installed on the side, close to the clamping jaw, of the positioning rotary knob. According to the device, the moving range of the pressure blocking plate is limited through the sliding strip, in the workpiece clamping process, a caliper does not need to be used for measuring workpiece clamping, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of machine tool processing technology, specifically to an automatic positioning and clamping device for CNC machine tools. Background Technology

[0002] In the field of CNC machine tool processing, cylindrical workpieces are generally held by a three-jaw chuck. In the mass production of CNC machining, workers often operate multiple machine tools to load and unload workpieces. Since the machine tool programs are pre-set, when the three-jaw chuck is holding the blank workpiece, it is necessary to measure the workpiece holding length or the workpiece machining length. At this time, the positioning accuracy and efficiency of the workpiece clamping device directly affect the machining quality and production cycle. Existing clamping devices mostly adopt the method of manually adjusting the position of the jaws or pressure plates, which requires repeated use of calipers or gauges to measure the relative position of the workpiece and the fixture, resulting in long clamping time and making it difficult to meet the needs of mass production. Utility Model Content

[0003] In view of the technical problems mentioned above, this utility model proposes the following technical solution:

[0004] An automatic positioning and clamping device for CNC machine tools includes a three-jaw chuck and a workpiece. The three-jaw chuck is provided with a plurality of jaws for clamping the workpiece. A pressure plate is slidably installed at one end of each jaw near the axis of the three-jaw chuck. The pressure plate is in contact with the workpiece and is used to reflect the position of the workpiece.

[0005] Furthermore, a positioning strip is fixedly installed on one side of the claw, and the positioning strip is provided with multiple limiting grooves. A sliding strip is slidably installed on the claw, and a positioning knob is threadedly installed on the end of the sliding strip away from the fixed sleeve. A locking protrusion is rotatably installed on the side of the positioning knob near the claw. After the locking protrusion on the positioning knob engages with the limiting groove, the position of the sliding strip will be restricted.

[0006] Furthermore, a return spring is fixedly installed on the pressure plate, and the other end of the return spring is fixedly installed on the chuck. When the pressure plate moves and the pressure plate disengages from the workpiece, the return spring will return the pressure plate to its initial position.

[0007] Furthermore, a scale bar is provided on one side of the positioning strip of the claw. The scale bar is used to display the position of the sliding bar. When the position of the sliding bar needs to be adjusted, the scale bar can be used as a reference for adjustment.

[0008] Furthermore, multiple sliding frames are slidably mounted on the outer side of the three-jaw chuck. The sliding frames are arranged on both sides of the jaws, and the two sliding frames on both sides of the jaws form a group to support the movement of the synchronization ring.

[0009] Further, the sliding frame is fixedly installed with a synchronous ring, the synchronous ring is used for synchronous adjustment of the sliding bar on the device, a plurality of fixing sleeves are fixedly installed on the synchronous ring, two fixing sleeves are arranged on the two sides of the claw, the fixing sleeves are in contact with the two sides of the claw, and the fixing sleeves are in sliding linkage with the sliding bar.

[0010] The device has the following beneficial effects compared with the prior art: (1) The device limits the moving range of the blocking plate through the sliding bar, so that the workpiece does not need to be measured for clamping during the clamping process, and the working efficiency is improved; (2) The device is provided with a scale bar on one side of the claw, so that the sliding bar can be accurately positioned during adjustment, and the sliding bar on all claws is adjusted through the fixing sleeve and the synchronous ring, so that the calibration time is greatly reduced, and the workload of the user is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a whole structure schematic view of the utility model.

[0012] Figure 2 It is a sliding frame structure schematic view of the utility model.

[0013] Figure 3 It is a synchronous ring structure schematic view of the utility model.

[0014] Figure 4 It is a sliding bar structure schematic view of the utility model.

[0015] Figure 5 It is a scale bar structure schematic view of the utility model.

[0016] Figure 6 It is a blocking plate structure schematic view of the utility model.

[0017] Reference signs: 101-Three-jaw chuck, 102-Workpiece, 103-Claw, 201-Blocking plate, 202-Positioning clamping strip, 203-Scale bar, 204-Positioning knob, 205-Sliding bar, 206-Fixing sleeve, 207-Reset spring, 208-Synchronous ring, 209-Sliding frame. DETAILED DESCRIPTION

[0018] As Figure 1 , Figure 2As shown, an automatic positioning and clamping device for a CNC machine tool includes a three-jaw chuck 101 and a workpiece 102. The three-jaw chuck 101 has multiple jaws 103 for clamping the workpiece 102. Multiple sliding frames 209 are slidably mounted on the outer side of the three-jaw chuck 101, located on both sides of the jaws 103. Two sliding frames 209 on each side of the jaws 103 form a group to support the movement of a synchronization ring 208. A synchronization ring 208 is fixedly mounted on each sliding frame 209. The synchronization ring 208 is configured to allow the device to adjust synchronously. The diameter of the synchronization ring 208 is based on the maximum radial movement range of the jaws 103 on the three-jaw chuck 101. This is to prevent the synchronization ring 208 from restricting the range of motion of the jaws 103. It should be noted that the synchronizing ring 208 must rotate along with the three-jaw chuck 101. Therefore, the synchronizing ring 208 must not contact the sliding rails or trays on the lathe. Multiple fixing sleeves 206 are fixedly installed on the synchronizing ring 208. The fixing sleeves 206 are arranged in pairs on both sides of the jaw 103. The fixing sleeves 206 contact both sides of the jaw 103. A sliding strip 205 is slidably installed inside the fixing sleeve 206. The end of the sliding strip 205 away from the fixing sleeve 206 is slidably connected to the jaw 103. A positioning knob 204 is threadedly installed on the end of the sliding strip 205 away from the fixing sleeve 206. A locking protrusion is rotatably installed on the side of the positioning knob 204 near the jaw 103. This locking protrusion is used to restrict the movement of the sliding strip 205.

[0019] A positioning strip 202 is fixedly installed on one side of the claw 103. The positioning strip 202 has multiple limiting grooves that can engage with the locking protrusions on the positioning knob 204. When the limiting grooves engage with the locking protrusions, the position of the sliding bar 205 is limited. A scale bar 203 is also provided on the side of the claw 103 where the positioning strip 202 is located. The scale bar 203 is used to indicate the position of the sliding bar 205. When adjusting the position of the sliding bar 205, the scale bar 203 can be used as a reference. A pressure plate 201 is slidably mounted on one end of the jaw 103 near the axis of the three-jaw chuck 101. The pressure plate 201 is in contact with the workpiece 102 and is used to respond to the position of the workpiece 102. A return spring 207 is fixedly mounted on the pressure plate 201, and the other end of the return spring 207 is fixedly mounted on the jaw 103. When the pressure plate 201 moves and the pressure plate 201 disengages from the workpiece 102, the return spring 207 will return the pressure plate 201 to its initial position.

[0020] Working Principle: During use, the user rotates the positioning knob 204 on each jaw 103 to disengage the locking protrusion from the limiting groove, thus releasing the restriction on the sliding bar 205 and the synchronizing ring 208. The user can then adjust the position of the sliding bar 205 by pulling the synchronizing ring 208. When adjusting the position of the sliding bar 205, it is important to confirm the adjustment distance using the scale 203. After confirming the position of the sliding bar 205, the positioning knob 204 is rotated to engage the locking protrusion with the limiting groove, thereby restricting the position of the sliding bar 205 and the synchronizing ring 208. After confirming the position of the sliding bar 205, if a workpiece 102 is to be installed, it only needs to contact the pressure plate 201 on any jaw 103. The user then uses the workpiece 102 to press the pressure plate 201 towards the three-jaw chuck 101. In this case, the pressure plate 201 will move a certain distance and then... When the positioning knob 204 contacts the pressure plate 201, the workpiece 102 is in its final installation position. At this point, the tool can be used to drive the jaw 103 to move radially towards the axis of the three-jaw chuck 101, thus allowing the jaw 103 to center and clamp the workpiece 102. It is worth noting that the user can pre-set the position of the jaw 103. The optimal state is that the workpiece 102 can contact all three pressure plates 201 simultaneously before being clamped, which ensures the most secure installation position. In addition, the user can set the positioning knob 204 on only one jaw 103 to fix the position of the sliding bar 205 and the synchronizing ring 208. This is for the convenience of the user. With only one positioning knob 204, the user can adjust the position of the sliding bar 205 and the synchronizing ring 208 more efficiently, but correspondingly, the squeezing force on the sliding bar 205 and the synchronizing ring 208 will be reduced.

Claims

1. An automatic positioning and clamping device for a CNC machine tool, comprising a three-jaw chuck (101) and a workpiece (102), wherein the three-jaw chuck (101) is provided with a plurality of jaws (103) for clamping the workpiece (102), characterized in that: A pressure plate (201) is slidably mounted on one end of the jaw (103) near the axis of the three-jaw chuck (101). The pressure plate (201) contacts the workpiece (102) and is used to reflect the position of the workpiece (102). A positioning strip (202) is fixedly installed on one side of the claw (103). The positioning strip (202) is provided with multiple limiting grooves. A sliding strip (205) is slidably installed on the claw (103). A positioning knob (204) is threadedly installed on the end of the sliding strip (205) away from the fixed sleeve (206). A locking protrusion is rotatably installed on the side of the positioning knob (204) near the claw (103). After the locking protrusion on the positioning knob (204) engages with the limiting groove, the position of the sliding strip (205) will be restricted.

2. The automatic positioning and clamping device for CNC machine tools according to claim 1, characterized in that: A return spring (207) is fixedly installed on the pressure plate (201). The other end of the return spring (207) is fixedly installed on the chuck (103). When the pressure plate (201) moves, after the pressure plate (201) and the workpiece (102) are separated, the return spring (207) will return the pressure plate (201) to its initial position.

3. The automatic positioning and clamping device for CNC machine tools according to claim 1, characterized in that: The claw (103) is provided with a scale bar (203) on one side of the positioning clip (202). The scale bar (203) is used to display the position of the slider (205). When the position of the slider (205) needs to be adjusted, the scale bar (203) can be used as a reference for adjustment.

4. The automatic positioning and clamping device for CNC machine tools according to claim 1, characterized in that: Multiple sliding frames (209) are slidably mounted on the outer side of the three-jaw chuck (101). The sliding frames (209) are arranged on both sides of the jaw (103). The two sliding frames (209) on both sides of the jaw (103) form a set to support the movement of the synchronization ring (208).

5. The automatic positioning and clamping device for CNC machine tools according to claim 4, characterized in that: A synchronization ring (208) is fixedly installed on the sliding frame (209). The synchronization ring (208) is used to synchronize the adjustment of the sliding bar (205) on this device. A plurality of fixing sleeves (206) are fixedly installed on the synchronization ring (208). The fixing sleeves (206) are arranged in pairs on both sides of the claw (103). The fixing sleeves (206) are in contact with both sides of the claw (103). The fixing sleeves (206) are slidably connected to the sliding bar (205).

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