A clamping tool for circumferential welding
By designing a circumferential positioning device and a rotary clamping device, the problems of inaccurate positioning and low efficiency in circumferential welding are solved, achieving accurate positioning of the workpiece and efficient welding, and reducing safety hazards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI LONGHUA AUTOMOBILE FITTINGS CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the three-jaw cylinder clamping and positioning during circumferential welding is inaccurate, which can easily damage the workpiece. In addition, manual clamping is inefficient and poses safety hazards.
A circumferential welding clamping fixture, including a circumferential positioning device and a rotary clamping device, is adopted. The positioning rollers and the clamping rollers work together to accurately position the outer circle of the workpiece, and the pneumatic rotary chuck clamps the workpiece to increase the contact area and avoid indentation damage to the workpiece.
It achieves accurate workpiece positioning and efficient welding, improves production efficiency, reduces safety hazards, and avoids indentation on the workpiece surface.
Smart Images
Figure CN224295082U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machinery, and more particularly to tooling fixtures, especially a circumferential welding clamping fixture. Background Technology
[0002] During the circumferential welding of the MI tube and protective tube of the temperature sensor, a stainless steel cylindrical tube with a thickness of 0.2mm and an inner diameter of 5mm needs to be circumferentially welded to a stainless steel tube with an outer diameter of 5mm. The existing method involves the worker placing the assembled stainless steel component into a three-jaw cylinder with their left hand and holding the workpiece, while simultaneously activating the three-jaw cylinder with their right hand and then activating both hands to begin the circumferential welding. Manual placement requires a high level of worker skill; misalignment can lead to inaccurate positioning and cause the three-jaw cylinder to directly crush the stainless steel cylinder, resulting in surface indentations. Furthermore, manual clamping allows for welding only one workpiece at a time, resulting in low efficiency and safety hazards. Summary of the Invention
[0003] The purpose of this utility model is to provide a circumferential welding clamping fixture, which solves the technical problem in the prior art that the three-jaw cylinder clamping and positioning is inaccurate and easily produces indentations that damage the workpiece during circumferential welding.
[0004] This utility model's circumferential welding fixture includes a vertically arranged first substrate and a horizontally arranged second substrate.
[0005] A circumferential positioning device and a pressing positioning device are provided on the front side of the first substrate. The circumferential positioning device includes a positioning plate, positioning rollers, a first cylinder, and a pressing roller. The positioning plate is fixedly disposed on the lower part of the front side of the first substrate. A groove is provided on the front side of the positioning plate, and positioning rollers are respectively arranged on opposite sides of the groove. The axial direction of the positioning rollers is vertical. A first cylinder is installed on the front side of the first substrate. The piston rod of the first cylinder extends forward and is connected to a connecting block. A first pressing block is provided on the rear side of the connecting block. A pressing roller is provided on one side of the first pressing block. The pressing roller is located on the front side between the two positioning rollers, and the axial direction of the pressing roller is vertical.
[0006] The pressing and positioning device includes a linear drive device and a second pressing block. The linear drive device is positioned above the circumferential positioning device and is used to drive the second pressing block to move up and down.
[0007] The second substrate is disposed below the front side of the first substrate, and a rotary clamping device is disposed on the upper side of the second substrate. The rotary clamping device is located below the circumferential positioning device. The rotary clamping device includes a rotary worktable and a pneumatic rotary chuck. The rotary worktable is mounted on the second substrate, and the pneumatic rotary chuck is mounted on the upper side of the rotary table surface of the rotary worktable. A collet is installed inside the pneumatic rotary chuck.
[0008] Furthermore, a first guide post is fixedly provided on the rear side of the connecting block, a first guide hole is provided on the front side of the first pressure block, the rear end of the first guide post passes through the first guide hole, and a first spring is sleeved on the outer side of the first guide post. The first spring 207 biases the first pressure block 208 backward.
[0009] Furthermore, the linear drive device includes a mounting plate, which is mounted on the upper front side of the first base plate. A second cylinder is mounted on the upper front side of the mounting plate. The lower front side of the mounting plate is slidably connected to a first sliding block via a first guide rail slider mechanism. The piston rod of the second cylinder extends downward and is connected to the top of the first sliding block. A baffle is mounted on the upper front side of the first sliding block. The lower front side of the first sliding block is slidably connected to a second sliding block via a second guide rail slider mechanism. A second guide post is provided on the lower side of the baffle. A second guide hole is provided on the upper side of the second sliding block. The lower end of the second guide post extends into the second guide hole. A second spring is sleeved on the outer side of the second guide post. The second spring biases the second sliding block downward. A second pressure block is fixedly mounted on the front side of the second sliding block.
[0010] Furthermore, a slotted photoelectric sensor is provided on the upper side of the second substrate, and a sensing plate is provided on one side of the rotating platform. The sensing plate cooperates with the slotted photoelectric sensor to sense.
[0011] Furthermore, the model number of the pneumatic rotary chuck is JAC-T8-D.
[0012] Furthermore, the first substrate is provided with two sets of circumferential positioning devices, the second substrate is provided with two sets of rotary clamping devices, the second substrate is fixedly connected to a motor, and the bottom of the rotating table of any one of the rotary worktables is fixedly connected to a rotating shaft. The lower end of any one of the rotating shafts and the output shaft of the motor are equipped with synchronous pulleys, and the multiple synchronous pulleys are connected by synchronous belt drive.
[0013] Compared with existing technologies, the advantages of this invention are positive and significant. This invention uses the positioning rollers and clamping rollers of the circumferential positioning device to accurately position the outer diameter of the workpiece. Then, the workpiece is clamped by the pneumatic rotary chuck of the rotary clamping device, which increases the contact area between the workpiece and the chuck, preventing point contact that could cause indentations and damage to the workpiece surface. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Figure 2 This is a structural schematic diagram of the circumferential positioning device and the downward positioning device of this utility model.
[0016] Figure 3 This is a partial enlarged view of the circumferential positioning device of this utility model.
[0017] Figure 4 This is a schematic diagram of the front structure of the rotary clamping device of this utility model.
[0018] Figure 5 This is a schematic diagram of the rear structure of the rotary clamping device of this utility model.
[0019] Figure 6 This is a schematic diagram of the lower structure of the rotary clamping device of this utility model.
[0020] In the diagram, the markings are as follows: 100, first base plate; 200, circumferential positioning device; 201, positioning plate; 202, groove; 203, positioning roller; 204, first cylinder; 205, connecting block; 206, first guide post; 207, first spring; 208, first pressure block; 209, pressing roller; 300, downward positioning device; 301, mounting plate; 302, second cylinder; 303, first guide rail slider mechanism; 304, first sliding block; 305, stop block; 30 6. Second guide post; 307. Second spring; 308. Second guide rail slider mechanism; 309. Second sliding block; 310. Second pressure block; 400. Second base plate; 500. Rotary clamping device; 501. Rotary worktable; 502. Rotary table surface; 503. Pneumatic rotary chuck; 504. Collet; 505. Rotating shaft; 506. Motor; 507. Synchronous pulley; 508. Synchronous belt; 509. Slotted photoelectric sensor; 510. Sensing plate; 600. Workpiece. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention.
[0022] like Figures 1-6 As shown, the circumferential clamping welding fixture of this utility model includes a vertically arranged first substrate 100 and a horizontally arranged second substrate 400.
[0023] A circumferential positioning device 200 and a pressing positioning device 300 are provided on the front side of the first substrate 100. The circumferential positioning device 200 includes a positioning plate 201, positioning rollers 203, a first cylinder 204, and a pressing roller 209. The positioning plate 201 is fixedly disposed on the lower part of the front side of the first substrate 100. A groove 202 is provided on the front side of the positioning plate 201. Positioning rollers 203 are respectively arranged on opposite sides of the groove 202. The axial direction of the positioning rollers 203 is vertical. The first cylinder 204 is installed on the front side of the first substrate 100. The piston rod of the first cylinder 204 extends forward and is connected to a connecting block 205. A first pressing block 208 is provided on the rear side of the connecting block 205. A pressing roller 209 is provided on one side of the first pressing block 208. The axial direction of the pressing roller 209 is vertical.
[0024] The pressing and positioning device 300 includes a linear drive device and a second pressing block 308. The linear drive device is disposed above the circumferential positioning device 200 and is used to drive the second pressing block 308 to move up and down.
[0025] The second substrate 400 is disposed below the front side of the first substrate 100. A rotary clamping device 500 is disposed on the upper side of the second substrate 400. The rotary clamping device 500 is located below the circumferential positioning device 200. The rotary clamping device 500 includes a rotary worktable 501 and a pneumatic rotary chuck 503. The rotary worktable is mounted on the second substrate 400. The pneumatic rotary chuck 503 is mounted on the upper side of the rotary table surface 502 of the rotary worktable 501. A collet 504 is installed inside the pneumatic rotary chuck 503.
[0026] Furthermore, a first guide post 206 is fixedly provided on the rear side of the connecting block 205, a first guide hole is provided on the front side of the first pressure block 208, the rear end of the first guide post 206 passes through the first guide hole, and a first spring 207 is sleeved on the outer side of the first guide post 206, and the first spring 207 biases the first pressure block 208 backward.
[0027] Furthermore, the linear drive device includes a mounting plate 301, which is mounted on the upper front side of the first base plate 100. A second cylinder 302 is mounted on the upper front side of the mounting plate 301. The lower front side of the mounting plate 301 is slidably connected to a first sliding block 304 via a first guide rail slider mechanism 303. The piston rod of the second cylinder 302 extends downward and is connected to the top of the first sliding block 304. A baffle is mounted on the upper front side of the first sliding block 304. The lower front side of the first sliding block 304 is slidably connected to a second sliding block 309 via a second guide rail slider mechanism 308. A second guide post 306 is provided on the lower side of the baffle 305. A second guide hole is provided on the upper side of the second sliding block 309. The lower end of the second guide post 306 extends into the second guide hole. A second spring 307 is sleeved on the outer side of the second guide post 306. The second spring 307 biases the second sliding block 309 downward. A second pressure block 310 is fixedly mounted on the front side of the second sliding block 309.
[0028] Furthermore, a slotted photoelectric sensor 509 is provided on the upper side of the second substrate 400, and a sensing sheet 510 is provided on one side of the rotating platform 502. The sensing sheet 510 cooperates with the slotted photoelectric sensor 509 to sense.
[0029] Furthermore, the pneumatic rotary chuck 501 is model JAC-T8-D.
[0030] Furthermore, the first substrate 100 is provided with two sets of circumferential positioning devices 200, the second substrate 400 is provided with two sets of rotary clamping devices 500, the second substrate 400 is fixedly connected to a motor 506, and the lower part of the rotating table 502 of any of the rotary worktables 501 is fixedly connected to a rotating shaft 505. The lower end of any of the rotating shafts 505 and the output shaft of the motor 506 are equipped with synchronous pulleys 507, and the multiple synchronous pulleys 507 are connected by synchronous belts 508.
[0031] When using this utility model, the workpiece 600 is first inserted into the collet 504 of the pneumatic rotary chuck 503. The gap between the collet 504 and the workpiece 600 is small, which can play a role in pre-positioning. The collet 504 and the workpiece 600 are in circumferential contact, with a large contact area, which can prevent the workpiece 600 from being pinched. The upper part of the workpiece 600 is located between the front sides of the two positioning rollers 203. For ease of operation, the collet 504 can be clamped first by the pneumatic rotary chuck 503, and then the first cylinder 204 and the second cylinder 302 are started. The piston rod of the first cylinder 204 retracts, and the connecting block 205 cooperates with the first spring 207, causing the first pressing block 208 to move backward. The pressing roller 209 presses the workpiece 600 between the front sides of the two positioning rollers 203. After pressing, the pressing roller 209 and the two positioning rollers 203 are tangent to the outer periphery of the workpiece 600. The second cylinder 302 pushes the first sliding block 304 downward. The stop block 304 of the first sliding block 304 cooperates with the second spring 207 to push the second sliding block 309 and the second pressing block 310 downward, so that the second pressing block 310 presses the upper end of the workpiece 600. Then the collet 504 is released, and the positioning rollers 203 and pressing rollers 209 of the circumferential positioning device 200 cooperate to adjust the verticality of the workpiece 600. The second pressing block 310 of the downward positioning device 300 presses the workpiece 600 down, so that the bottom end of the workpiece 600 contacts the rotating table surface 502, thereby ensuring the height positioning of the workpiece 600. Then clamp the collet 504, causing the rotating table 502 of the rotary worktable 501 to rotate. The rotating table 502 drives the pneumatic rotary chuck 503 to rotate, causing the workpiece 600 to rotate for circumferential welding.
[0032] like Figure 2 and Figure 3As shown, the first pressure block 208 of the circumferential positioning device 200 can be equipped with two first guide posts 206, and two first guide holes (not shown in the figure) are correspondingly provided on the first pressure block 208. The first guide posts 206 are installed from the front end of the connecting block 205, pass through the first spring 207 and the first guide holes. The first guide posts 206 can hold the first spring 207 and guide the first pressure block 208. The two first guide posts 206 and the two first guide holes can ensure the balance of the first pressure block 208. The first spring 207 can relieve the force when the pressure roller 209 presses the workpiece 600, preventing the first cylinder 204 from pressing the workpiece 600 with excessive pressure. The two ends of the first spring 207 can be welded and fixed to the connecting block 205 and the first pressure block 208 respectively to prevent the first pressure block 208 from coming off. Similarly, two second guide posts 306 can be provided on the stop block 305, and two second guide holes (not shown in the figure) are correspondingly provided on the upper side of the second sliding block 309. This ensures that the second sliding block 309 is subjected to force balance. The second spring 307 can be installed from the top of the stop block 305, passing through the second spring 207 and the second guide holes. The second guide posts can hold the second spring 307. During the pressing of the second pressure block 310, the second spring 307 can relieve the force and prevent the pressure of the second cylinder 302 from being too high and pressing the workpiece 600. During the pressing of the second cylinder 302, the first guide rail slider mechanism 303 guides the movement of the first sliding block 304, and the second guide rail slider mechanism 308 guides the second sliding block 309, thereby ensuring that the second pressure block 310 moves vertically.
[0033] like Figure 5 As shown, a sensor plate 510 is installed on one side of the rotating table 502, and a slotted photoelectric sensor 509 is installed on the upper side of the second substrate 400. One end of the sensor plate 510 can extend into the sensing slot of the slotted photoelectric sensor 509. When the rotating table 502 rotates one revolution, it can emit a sensing signal, and the start and stop of the motor 506 can be controlled according to the sensing signal.
[0034] like Figure 1 As shown, due to the inclusion of a circumferential positioning device 200 and a rotary clamping device 500, the operator does not need to manually hold the workpiece 600 for clamping. To improve production efficiency, two sets of circumferential positioning devices 200, a downward positioning device 300, and a rotary positioning device 500 can be installed. The operator can place two workpieces 600 into the rotary positioning device 500 with both hands, and then start welding, completing the welding of two workpieces 600 at once, thereby improving production efficiency. Figure 6As shown, a motor 506 is mounted on the second base plate 400. The motor 506 can simultaneously drive the rotating surfaces 502 of the two rotating worktables 501 to rotate via a synchronous belt 508 and a synchronous pulley 507. Then, the rotating surfaces 502 drive the pneumatic rotary chuck 503 to rotate.
Claims
1. A circumferential welding clamping fixture, characterized in that: It includes a vertically arranged first substrate (100) and a horizontally arranged second substrate (400). A circumferential positioning device (200) and a pressing positioning device (300) are provided on the front side of the first substrate (100). The circumferential positioning device (200) includes a positioning plate (201), positioning rollers (203), a first cylinder (204), and a pressing roller (209). The positioning plate (201) is fixedly disposed on the lower part of the front side of the first substrate (100). A groove (202) is provided on the front side of the positioning plate (201), and positioning rollers (203) are respectively provided on opposite sides of the groove (202). The roller (203) is axially vertical. A first cylinder (204) is mounted on the front side of the first base plate (100). The piston rod of the first cylinder (204) extends forward and is connected to a connecting block (205). A first pressure block (208) is provided on the rear side of the connecting block (205). A pressing roller (209) is provided on one side of the first pressure block (208). The pressing roller (209) is located on the front side between the two positioning rollers (203). The axial direction of the pressing roller (209) is vertical. The pressing positioning device (300) includes a linear drive device and a second pressing block (308). The linear drive device is disposed above the circumferential positioning device (200) and is used to drive the second pressing block (308) to move up and down. The second substrate (400) is disposed below the front side of the first substrate (100). A rotary clamping device (500) is disposed on the upper side of the second substrate (400). The rotary clamping device (500) is located below the circumferential positioning device (200). The rotary clamping device (500) includes a rotary worktable (501) and a pneumatic rotary chuck (503). The rotary worktable is mounted on the second substrate (400). The pneumatic rotary chuck (503) is mounted on the upper side of the rotary table surface (502) of the rotary worktable (501). A collet (504) is installed inside the pneumatic rotary chuck (503).
2. The circumferential welding clamping fixture as described in claim 1, characterized in that: A first guide post (206) is fixedly provided on the rear side of the connecting block (205), and a first guide hole is provided on the front side of the first pressure block (208). The rear end of the first guide post (206) passes through the first guide hole, and a first spring (207) is sleeved on the outer side of the first guide post (206). The first spring (207) biases the first pressure block (208) backward.
3. The circumferential welding clamping fixture as described in claim 1, characterized in that: The linear drive device includes a mounting plate (301) mounted on the upper front side of the first base plate (100). A second cylinder (302) is mounted on the upper front side of the mounting plate (301). The lower front side of the mounting plate (301) is slidably connected to a first sliding block (304) via a first guide rail slider mechanism (303). The piston rod of the second cylinder (302) extends downward and connects to the top of the first sliding block (304). A baffle is mounted on the upper front side of the first sliding block (304). The front side is slidably connected to a second sliding block (309) via a second guide rail slider mechanism (308). A second guide post (306) is provided on the lower side of the stop block (305). A second guide hole is provided on the upper side of the second sliding block (309). The lower end of the second guide post (306) extends into the second guide hole. A second spring (307) is sleeved on the outer side of the second guide post (306). The second spring (307) biases the second sliding block (309) downward. A second pressure block (310) is fixedly installed on the front side of the second sliding block (309).
4. The circumferential welding clamping fixture as described in claim 1, characterized in that: A slotted photoelectric sensor (509) is provided on the upper side of the second substrate (400), and a sensing sheet (510) is provided on one side of the rotating platform (502). The sensing sheet (510) cooperates with the slotted photoelectric sensor (509) to sense.
5. The circumferential welding clamping fixture as described in claim 1, characterized in that: The pneumatic rotary chuck (503) is model JAC-T8-D.
6. The circumferential welding clamping fixture as described in any one of claims 1-5, characterized in that: The first substrate (100) is provided with two sets of circumferential positioning devices (200), the second substrate (400) is provided with two sets of rotary clamping devices (500), the second substrate (400) is fixedly connected to a motor (506), and the rotating table (502) of any of the rotary worktables (501) is fixedly connected to a rotating shaft (505) below. The lower end of any of the rotating shafts (505) and the output shaft of the motor (506) are equipped with synchronous pulleys (507), and the multiple synchronous pulleys (507) are connected by synchronous belts (508).