A follow-up clamping device

Abstract

The present invention provides a follow-up clamping device, which belongs to the technical field of tooling fixtures. It solves the problem of low clamping and positioning efficiency of existing clamping devices. The follow-up clamping device includes a mounting seat, a sliding groove is provided on the outer wall of the mounting seat, a first elastic member and a sliding bar are provided in the sliding groove, a front end of the sliding bar has a supporting column, a rocker arm is also hinged on the outer wall of the mounting seat, the inner end of the rocker arm is connected to the sliding bar, and a clamping structure is provided at the outer end of the rocker arm. Under the action of the elastic force of the first elastic member, the sliding bar moves along the sliding groove to make the supporting column protrude from the front end of the mounting seat, and the rocker arm rotates to drive the clamping structure to open outward, and the supporting column is pressed. The sliding bar can overcome the elastic force of the first elastic member and move in the opposite direction along the sliding groove and drive the rocker arm to rotate in the opposite direction, so that the clamping structure shrinks inward to clamp the workpiece. The follow-up clamping device has the advantage of high clamping and positioning efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of tooling fixtures and relates to a follow-up clamping device. Background Art

[0002] With the development of society and the advancement of technology, the degree of mechanization in the production of enterprises is getting higher and higher. Lathes, milling machines and other equipment are used in large quantities. The lathe includes a three-jaw chuck for clamping the workpiece. Through the clamping and rotation of the three-jaw chuck, the workpiece can be turned, milled, drilled, welded and other processes.

[0003] An existing three-jaw chuck, for example, a three-jaw chuck disclosed in Chinese patent literature [application number: 201410725732.7; application publication number: CN104475788A], comprises a disc-shaped base; three slots are evenly distributed on the base, and first screw holes are provided on the inner sides of the slots, and clamping devices are installed in the first screw holes; the clamping device comprises a screw rod, a movable moving seat is provided on the screw rod, and a clamping claw connected to the moving seat; one end of the screw rod extends out of the base and is connected to the motor; a "V"-shaped slot is provided at one end of the clamping claw facing the center of the base; two slide rails are arranged oppositely on both sides of the slot; two slide grooves are arranged oppositely on both sides of the moving seat; the slide rails and the slide grooves are used in conjunction with each other; wear-resistant sheets are provided on both sides of the "V"-shaped slot.

[0004] The three-jaw chuck of this structure drives the rotation of the screw by starting the motor, which in turn drives the movement of the moving seat, thereby driving the movement of the claws, and clamps the workpiece through the three claws to position the workpiece. However, each time the three-jaw chuck of this structure clamps the workpiece, it is necessary to first place the workpiece in the clamping position, then start the motor, and use the motor to drive the claws to move so that the claws contact and clamp the workpiece, stop the motor, and then move the ejector pin to hold the workpiece, rotate the base, and perform milling or welding on the workpiece. After the processing is completed, move the ejector pin, start the motor, and make the claws rotate in the opposite direction, thereby releasing the workpiece and completing the processing of a workpiece. In this process, the motor needs to be started and stopped multiple times to achieve the clamping and loosening of the workpiece, which is cumbersome to operate and has low efficiency in workpiece clamping and positioning. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a follow-up clamping device, the technical problem to be solved is how to improve the clamping and positioning efficiency of the workpiece.

[0006] The cam is an elastic member formed in the outer wall of the first elastic member, and the movable member is provided with a protruding support column, the movable member being a support column having a protruding support column and a support column.

[0007] When in use, the rear end of the mounting seat of the follow-up clamping device can be fixed in the three-jaw chuck. In the normal state, under the action of the elastic force of the first elastic member, the front end of the sliding bar abuts against the mounting seat, and the abutting column is protrudingly arranged at the front end of the mounting seat. Several clamping structures are expanded and opened. When positioning the workpiece, the workpiece is embedded between the several clamping structures so that the workpiece contacts and presses the abutting column. The sliding bar overcomes the elastic force of the first elastic member and moves along the sliding groove. The movement of the sliding bar drives the rocker to rotate in the opposite direction, so that the clamping structure contracts inward to contact and press the workpiece. The setting of the clamping structure enables the workpiece to be better clamped and positioned, thereby improving the stability of the workpiece. When the follow-up clamping device clamps the workpiece, it only needs to apply a certain axial force to the workpiece so that the workpiece presses the abutting column to clamp the workpiece. When releasing the workpiece, it only needs to withdraw the axial force. The workpiece is automatically clamped and released without the need for other operating steps. The clamping and releasing of the workpiece is convenient, thereby improving the clamping and positioning efficiency of the workpiece.

[0008] In the above-mentioned follow-up clamping device, the front end of the sliding groove passes through the front end of the mounting seat, and a baffle is fixedly connected to the front end surface of the mounting seat, and the baffle has a plurality of penetrating guide holes, and the guide holes are arranged one by one with the sliding groove. When the abutment column passes through the guide hole and protrudes at the front end of the mounting seat, the baffle blocks the sliding bar so that the sliding bar is located in the sliding groove. By setting the baffle, the abutment column can be protruded at the front end of the mounting seat, and can block the sliding bar to prevent the sliding bar from sliding out of the sliding groove. This structure makes the sliding groove easy to process, and the baffle only needs to be connected to the mounting seat through fasteners, which is easy to process.

[0009] In the above-mentioned follow-up clamping device, the rear end of the sliding groove passes through the rear end of the mounting seat, the rear end of the sliding groove is fixedly connected to the plug by threaded connection, and the rear end of the first elastic member abuts against the plug. The position of the plug can be changed, and the elastic force of the first elastic member can be changed by changing the position of the plug, so that the follow-up clamping device can better clamp and position the workpiece, thereby improving the clamping and positioning efficiency of the workpiece.

[0010] In the above-mentioned follow-up clamping device, the rear end of the mounting seat has a fixing portion protruding outward, and the fixing portion has a plurality of fixing holes or a plurality of fixing planes. The setting of the fixing portion enables the follow-up clamping device to be better installed on the three-jaw chuck of the machine tool, and the setting of the fixing holes and the fixing plane improves the firmness of the mounting seat, thereby improving the stability of the follow-up clamping device.

[0011] In the above-mentioned follow-up clamping device, the outer casing of the mounting seat is fixedly connected with a positioning ring, the rear end of the positioning ring partially blocks the sliding groove, the first elastic member is partially or completely located between the bottom of the sliding groove and the positioning ring, and the front end of the positioning ring is protruding and arranged at the front end of the mounting seat. The positioning ring plays a positioning role. First, the rear end of the positioning ring positions the first elastic member, so that the first elastic member is easy to install and the first elastic member will not fall off from the sliding groove. Second, the front end of the positioning ring radially positions the workpiece, so that the workpiece can be installed in place at one time, improving the installation accuracy of the workpiece, thereby improving the clamping and positioning efficiency of the workpiece.

[0012] In the above-mentioned follow-up clamping device, bearing seats are fixedly connected to both sides of the sliding groove, the positioning ring has a plurality of embedded recesses, the bearing seats are located in the corresponding embedded recesses, the inner end of the rocker arm is located between a pair of bearing seats, and the rocker arm and the bearing seat are hinged by a pin. Reasonable use of space, this structure prevents the bearing seat from protruding too much, and makes the integrity of the follow-up clamping device stronger and the structure compact.

[0013] In the above-mentioned follow-up clamping device, the clamping structure includes a clamping frame, the clamping frame is fixedly connected to the outer end of the rocker arm, a clamping rod is passed through the clamping frame, one end of the clamping rod is fixedly connected to a limiting block, and the other end of the clamping rod is fixedly connected to a clamping block, the clamping rod outer sleeve is provided with a second elastic member, the second elastic member outer sleeve is provided with a guide slider, the outer side wall of the guide slider is in contact with the inner side wall of the clamping frame, one end of the second elastic member acts on the clamping frame, and the other end of the second elastic member acts on the guide slider. Under the action of the second elastic member, the guide slider abuts against the clamping block and makes the clamping block always tend to move away from the limiting block, and the limiting block can abut against the clamping frame. The limit block plays a role of limiting, so that the clamping rod, the second elastic member, the guide slider and the clamping block will not fall off the clamping frame. When the clamping block contacts the workpiece, the second elastic member is compressed, and the second elastic member is compressed and generates an opposite force. The guide slider and the clamping block are pushed by the reverse force, so that the clamping block is tightly pressed on the workpiece to achieve the clamping and positioning of the workpiece. The guide slider plays a role of guiding and positioning. The setting of the guide slider enables the clamping block, the clamping rod and the limit block to move in the set direction and will not deviate from the set position, thereby improving the clamping accuracy of the follower clamping device and improving the efficiency of clamping and positioning.

[0014] As another case, in the above-mentioned follow-up clamping device, the clamping structure includes a clamping frame, the clamping frame is fixedly connected to the outer end of the rocker arm, a clamping rod is inserted in the clamping frame, one end of the clamping rod is fixedly connected to a limit block, the other end of the clamping rod is fixedly connected to a clamping block, a second elastic member is provided on the outer sleeve of the clamping rod, one end of the second elastic member acts on the clamping frame, and the other end of the second elastic member acts on the clamping block. Under the action of the second elastic member, the clamping block always has a tendency to move away from the limit block, and the limit block can abut against the clamping frame. The limit block plays a limiting role, so that the clamping rod, the second elastic member and the clamping block will not fall off the clamping frame. When the clamping block contacts the workpiece, the second elastic member is compressed, and the second elastic member will generate an opposite force when it is compressed. The clamping block is pushed by the reverse force, so that the clamping block is tightly pressed on the workpiece to achieve the clamping and positioning of the workpiece.

[0015] In the above-mentioned follow-up clamping device, the shape of the surface of the clamping block that contacts the workpiece matches the contact surface of the workpiece, thereby improving the clamping accuracy and the firmness of the clamping.

[0016] In the above-mentioned follow-up clamping device, the sliding bar has bar teeth, and the hinged end of the rocker arm has arc teeth, and the bar teeth and the arc teeth are meshed. Through the meshing of the bar teeth and the arc teeth, the linear movement of the sliding bar can better drive the rocker arm to rotate.

[0017] In the above-mentioned follower clamping device, the first elastic member and the second elastic member are both cylindrical springs.

[0018] Compared with the prior art, the follow-up clamping device provided by the present invention has the following advantages:

[0019] 1. This follow-up clamping device only needs to apply a certain axial force to the workpiece to press the workpiece against the column to clamp the workpiece. When releasing the workpiece, it is only necessary to remove the axial force. The workpiece is automatically clamped, positioned and released without other operating steps. The clamping and releasing of the workpiece is convenient, thereby improving the clamping and positioning efficiency of the workpiece.

[0020] 2. The clamping mechanism of the follow-up clamping device is an automatic clamping method that clamps by contact and releases without contact. No other operating steps are required, and the clamping and release of the workpiece are convenient, thereby improving the clamping and positioning efficiency of the workpiece.

[0021] 3. The follow-up clamping device has a simple structure, and the cost of each component is relatively low. Compared with the existing motor, hydraulic clamping device or pneumatic clamping device, the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the follow-up clamping device.

[0023] Figure 2 This is the overall structural section of the follow-up clamping device Figure 1 .

[0024] Figure 3 This is the overall structural section of the follow-up clamping device Figure 2 .

[0025] Figure 4 It is a structural schematic diagram of the mounting seat of the follow-up clamping device.

[0026] Figure 5 It is a structural schematic diagram of the positioning ring of the follow-up clamping device.

[0027] In the figure, 1, mounting seat; 101, fixing part; 102, fixing hole; 2, sliding groove; 3, first elastic member; 4, sliding bar; 41, bar-shaped tooth; 5, abutment column; 6, rocker arm; 61, arc-shaped tooth; 7, clamping structure; 71, clamping frame; 72, clamping rod; 73, limit block; 74, clamping block; 75, second elastic member; 76, guide slider; 8, baffle; 9, guide hole; 10, plug; 11, positioning ring; 12, bearing seat; 13, embedding recess; 14, tank body; 15, tank cover. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] Embodiment 1

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, the follow-up clamping device includes a mounting seat 1, a first elastic member 3, a sliding bar 4, a supporting column 5, a rocker arm 6, a clamping structure 7, a baffle 8, a plug 10, a positioning ring 11 and a bearing seat 12.

[0031] In this embodiment, the mounting base 1 is cylindrical as a whole, and the rear end of the mounting base 1 has a fixing portion 101 that protrudes outward, and the fixing portion 101 is in a circular ring shape. In this embodiment, the fixing portion 101 has four fixing holes 102. In actual production, the fixing portion 101 can have three or six fixing holes 102, or the fixing portion 101 can have three, four or six fixing planes.

[0032] like Figure 4 As shown, in this embodiment, four parallel sliding grooves 2 are provided on the outer wall of the mounting seat 1, the sliding grooves 2 are parallel to the axial direction of the mounting seat 1, the front end of the sliding groove 2 passes through the front end of the mounting seat 1, and the rear end of the sliding groove 2 passes through the rear end of the mounting seat 1. In actual production, the number of the sliding grooves 2 can be three or six.

[0033] The rear end of the sliding groove 2 is fixedly connected to the plug 10 by a threaded connection, and a baffle 8 is fixedly connected to the front end surface of the mounting seat 1, and the baffle 8 has a penetrating guide hole 9. The guide holes 9 are arranged one by one with the sliding groove 2, that is, in this embodiment, the number of guide holes 9 is also four, and a first elastic member 3 and a sliding bar 4 are provided in the sliding groove 2. The rear end of the first elastic member 3 abuts against the plug 10, and the front end of the first elastic member 3 acts on the rear end of the sliding bar 4. The front end of the sliding bar 4 has a protruding abutment column 5. In this embodiment, the outer diameter of the abutment column 5 is equal to the inner diameter of the guide hole 9. In actual production, the outer diameter of the abutment column 5 can be less than the inner diameter of the guide hole 9.

[0034] The outer surface of the mounting seat 1 is fixedly connected with a positioning ring 11, and the rear end of the positioning ring 11 partially blocks the sliding groove 2. In this embodiment, the first elastic member 3 is partially located between the bottom of the sliding groove 2 and the positioning ring 11. In actual production, the first elastic member 3 can be completely located between the bottom of the sliding groove 2 and the positioning ring 11. The front end of the positioning ring 11 is protruding and arranged at the front end of the mounting seat 1. The front end of the positioning ring 11 is used to position the workpiece. Figure 5As shown, the number of the embedded recesses 13 and the number of the sliding grooves 2 are arranged one by one, that is, in this embodiment, the number of the embedded recesses 13 is also four, and the two sides of the sliding groove 2 are fixedly connected with bearing seats 12, and the bearing seats 12 are located in the corresponding embedded recesses 13. The inner end of the rocker arm 6 is located between a pair of bearing seats 12, and the rocker arm 6 and the bearing seats 12 are hinged through a pin. The sliding bar 4 has a bar-shaped tooth 41, and the hinged end of the rocker arm 6 has an arc-shaped tooth 61. The bar-shaped tooth 41 and the arc-shaped tooth 61 are meshed so that the sliding bar 4 and the rocker arm 6 are meshed and connected.

[0035] The clamping structure 7 includes a clamping frame 71, which is fixedly connected to the outer end of the rocker arm 6. A clamping rod 72 is passed through the clamping frame 71. One end of the clamping rod 72 is fixedly connected to a limiting block 73, and the other end of the clamping rod 72 is fixedly connected to a clamping block 74. The clamping rod 72 is outer-coated with a second elastic member 75, and the second elastic member 75 is outer-coated with a guide slider 76. The outer side wall of the guide slider 76 fits the inner side wall of the clamping frame 71. One end of the second elastic member 75 acts on the clamping frame 71, and the other end of the second elastic member 75 acts on the guide slider 76. The shape of the surface of the clamping block 74 that is in contact with the workpiece matches the contact surface of the workpiece. In this embodiment, the contact surface is an arc. In actual production, the contact surface can be a plane or a wavy surface. The clamping block 74 is a copper block. During welding, the wire can be passed through the mounting seat 1 and connected to the clamping rod 72.

[0036] In this embodiment, the first elastic member 3 and the second elastic member 75 are both cylindrical springs. In actual production, the first elastic member 3 and the second elastic member 75 may both be conical springs.

[0037] The gas storage tank includes a tank body 14 and a tank cover 15. The follow-up clamping device is mainly used to position the tank body 14 and weld the gap between the tank body 14 and the tank cover 15. When working, the fixing part 101 of the mounting seat 1 is clamped by the three-jaw chuck. Figure 2 As shown, in the normal state, under the action of the elastic force of the first elastic member 3, the front end of the sliding bar 4 abuts against the baffle 8, the abutting column 5 passes through the guide hole 9 and protrudes outside the baffle 8, and the clamping structure 7 is expanded and opened. Under the action of the elastic force of the second elastic member 75, the limit block 73 abuts against the clamping frame 71, and the tank body 14 is moved. The front end of the positioning ring 11 radially positions the tank body 14, and the tank body 14 contacts the abutting column 5 and pushes the abutting column 5 to overcome the elastic force of the first elastic member 3, so that the rocker arm 6 rotates. Figure 3As shown, when the tank body 14 contacts the baffle 8, that is, when the tank body 14 is axially positioned, the clamping block 74 abuts against the side wall of the tube body, and the elastic force generated by the compression of the second elastic member 75 pushes the guide slider 76 and the positioning block to press the tank body 14, so that the tank body 14 is clamped and positioned, and the ejector pin of the machine tool ejects the tank cover 15, so that the tank cover 15 abuts against the tank body 14 and presses it, so that the tank body 14 and the tank cover 15 are evenly positioned, and finally the three-jaw chuck is rotated, and the gap between the tank body 14 and the tank cover 15 is welded by a welding gun. After the welding is completed, the ejector pin is released, and after the axial force on the tank body 14 and the tank cover 15 disappears, the first elastic member 3 can push out the gas storage tank after welding to realize unloading, and the limit block 73 and the clamping block 74 are reset under the action of the second elastic member 75.

[0038] Embodiment 2

[0039] The structure and principle of this embodiment are basically the same as those of the first embodiment. The difference is that in this embodiment, there is no guide slider 76, one end of the second elastic member 75 acts on the clamping frame 71, and the other end of the second elastic member 75 directly acts on the clamping block 74.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] Although the present invention uses more terms such as mounting seat 1, fixing part 101, fixing hole 102, sliding groove 2, first elastic member 3, sliding bar 4, bar-shaped tooth 41, abutting column 5, rocker arm 6, arc-shaped tooth 61, clamping structure 7, clamping frame 71, clamping rod 72, limit block 73, clamping block 74, second elastic member 75, guide slider 76, baffle 8, guide hole 9, plug 10, positioning ring 11, bearing seat 12, embedding recess 13, tank body 14, tank cover 15, etc., it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A follow-up clamping device, comprising a mounting seat (1), characterized in that: The outer wall of the mounting seat (1) is provided with a plurality of parallel sliding grooves (2), the sliding groove (2) is provided with a first elastic member (3) and a sliding bar (4), the rear end of the first elastic member (3) acts on the mounting seat (1), the front end of the first elastic member (3) acts on the rear end of the sliding bar (4), the front end of the sliding bar (4) has a protruding abutting column (5), the outer wall of the mounting seat (1) is also hinged with a plurality of rocker arms (6), the rocker arms (6) and the sliding bar (4) are arranged one-to-one and the inner end of the rocker arm (6) is connected to the sliding bar (4), the outer end of the rocker arm (6) is provided with a clamping structure (7), under the action of the elastic force of the first elastic member (3), the sliding bar (4) moves along the sliding groove (2) so that the abutting column (5) protrudes from the front end of the mounting seat (1), and makes The rocker arm (6) rotates to drive the clamping structure (7) to open outwards, pressing the abutting column (5). The sliding bar (4) can overcome the elastic force of the first elastic member (3) to move in the opposite direction along the sliding groove (2) and drive the rocker arm (6) to rotate in the opposite direction, so that the clamping structure (7) contracts inwards to clamp the workpiece. The outer shell of the mounting seat (1) is fixedly provided with a positioning ring (11). The rear end of the positioning ring (11) blocks part of the sliding groove (2). The first elastic member (3) is partially or completely located between the bottom of the sliding groove (2) and the positioning ring (11). The front end of the positioning ring (11) is protrudingly arranged at the front end of the mounting seat (1) for radially positioning the workpiece. The rear end of the mounting seat (1) has a fixing portion (101) protruding outwards. The fixing portion (101) has a plurality of fixing holes (102) or a plurality of fixing planes.

2. A follow-up clamping device according to claim 1, characterized in that: The front end of the sliding groove (2) passes through the front end of the mounting seat (1), and a baffle (8) is fixedly connected to the front end surface of the mounting seat (1). The baffle (8) has a plurality of penetrating guide holes (9), and the guide holes (9) are arranged in a one-to-one correspondence with the sliding groove (2). When the abutment column (5) passes through the guide hole (9) and protrudes from the front end of the mounting seat (1), the baffle (8) blocks the sliding bar (4) so ​​that the sliding bar (4) is located in the sliding groove (2).

3. A follow-up clamping device according to claim 1, characterized in that: The rear end of the sliding groove (2) passes through the rear end of the mounting seat (1), the rear end of the sliding groove (2) is fixedly connected to the plug (10) by means of a threaded connection, and the rear end of the first elastic member (3) abuts against the plug (10).

4. A follow-up clamping device according to claim 1, 2 or 3, characterized in that: The two sides of the sliding groove (2) are fixedly connected with bearing seats (12), the positioning ring (11) has a plurality of embedding recesses (13), the bearing seats (12) are located in the corresponding embedding recesses (13), the inner end of the rocker arm (6) is located between a pair of bearing seats (12), and the rocker arm (6) and the bearing seat (12) are hingedly connected via a pin shaft.

5. A follow-up clamping device according to claim 1, 2 or 3, characterized in that: The clamping structure (7) comprises a clamping frame (71), the clamping frame (71) being fixedly connected to the outer end of the rocker arm (6), a clamping rod (72) being passed through the clamping frame (71), one end of the clamping rod (72) being fixedly connected to a limit block (73), the other end of the clamping rod (72) being fixedly connected to a clamping block (74), a second elastic member (75) being provided on an outer sleeve of the clamping rod (72), a guide slider (76) being provided on an outer sleeve of the second elastic member (75), and the guide slider The outer wall of the second elastic member (76) is in contact with the inner wall of the pressing frame (71), one end of the second elastic member (75) acts on the pressing frame (71), and the other end of the second elastic member (75) acts on the guide slider (76). Under the action of the second elastic member (75), the guide slider (76) abuts against the pressing block (74) and makes the pressing block (74) always tend to move away from the limit block (73), and the limit block (73) can abut against the pressing frame (71).

6. A follow-up clamping device according to claim 1, 2 or 3, characterized in that: The clamping structure (7) comprises a clamping frame (71), the clamping frame (71) is fixedly connected to the outer end of the rocker arm (6), a clamping rod (72) is inserted into the clamping frame (71), one end of the clamping rod (72) is fixedly connected to a limit block (73), the other end of the clamping rod (72) is fixedly connected to a clamping block (74), a second elastic member (75) is provided on the outer sleeve of the clamping rod (72), one end of the second elastic member (75) acts on the clamping frame (71), and the other end of the second elastic member (75) acts on the clamping block (74), under the action of the second elastic member (75), the clamping block (74) always has a tendency to move away from the limit block (73), and the limit block (73) can abut against the clamping frame (71).

7. A follow-up clamping device according to claim 5, characterized in that: The shape of the surface of the pressing block (74) that contacts the workpiece matches the contact surface of the workpiece.

8. A follow-up clamping device according to claim 1, 2 or 3, characterized in that: The sliding bar (4) has a bar-shaped tooth (41), the hinged end of the rocker arm (6) has an arc-shaped tooth (61), and the bar-shaped tooth (41) and the arc-shaped tooth (61) are meshed with each other.

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