Precise work fixture with variable clamping force

Abstract

The utility model belongs to the technical field of work fixtures, and particularly relates to a precise work fixture with variable clamping force, which comprises a mounting seat, an adjusting structure mounted in the middle of the top surface of the mounting seat, a driving structure mounted on the outer surface of the adjusting structure close to the bottom end, and a clamping structure mounted at the top of the adjusting structure, and comprises a clamping unit and a pre-clamping unit, the pre-clamping unit is installed at the output end of the clamping unit and comprises a clamping plate, a sliding rod is installed in the middle of the clamping plate, a spring is arranged on the outer side of the sliding rod, a clamping plate is installed at the end, close to the spring, of the sliding rod, an air bag is installed in the middle of the side, close to the spring, of the clamping plate, and an air guide pipe is installed at the top of the air bag. According to the precise tool clamp with the variable clamping force, air is injected into the air bags through the air guide pipes, the clamping plates are extruded through the air bags, therefore, a workpiece can be pre-clamped, the stability of the workpiece before clamping is guaranteed, then the air cylinders are started to drive the connecting blocks and the clamping plates to move, and the workpiece is clamped and fixed through the clamping plates.

Description

Technical Field

[0001] This utility model relates to the field of tooling fixture technology, specifically a precision tooling fixture with variable clamping force. Background Technology

[0002] Turning is the mainstream machining process in the current machining industry. During machining, the blank is mounted on a special fixture. The thickness of the blank changes continuously during the machining process, that is, it goes through roughing and finishing. During roughing, the wall thickness is thicker and the clamping force required is larger. During finishing, the wall thickness is thinner and the clamping force required is smaller.

[0003] The existing traditional process separates the roughing and finishing processes to ensure that the blank will not deform after it is thinned. However, the disadvantages of this processing method are that it increases the number of processing steps and costs, occupies equipment and space, has low labor utilization, and reduces the production efficiency of enterprises.

[0004] As disclosed in Chinese Patent CN206241285U, a precision tooling fixture with variable clamping force is constructed using an inductive clamping mechanism, a servo hydraulic station, a digital pressure gauge, and a PLC controller. These components are sequentially connected to form a signal loop. The digital pressure gauge transmits the data sensed from the inductive clamping mechanism to the PLC controller. The PLC controller receives the signal, performs logical operations, and then outputs the signal to the servo hydraulic station. The servo hydraulic station adjusts the output pressure value of the inductive clamping mechanism based on the received signal. By adjusting the clamping force during machining, the fixture integrates roughing and finishing processes, reduces labor costs, and improves factory space utilization and production efficiency.

[0005] However, in the existing technology, after placing the workpiece, it is necessary to pre-clamp the workpiece to ensure its stability before activating the clamping structure to clamp and fix it. Existing fixtures usually clamp directly during the clamping process and lack a pre-clamping structure.

[0006] Therefore, we urgently need to provide a precision tooling fixture with variable clamping force. Utility Model Content

[0007] The purpose of this utility model is to provide a precision tooling fixture with variable clamping force to solve the problem mentioned in the background art that in the process of clamping and fixing the workpiece, after placing the workpiece, it is necessary to pre-clamp the workpiece to ensure the stability of the workpiece placement, and then activate the clamping structure to clamp and fix the workpiece. However, existing fixtures usually clamp directly during the clamping process and lack a pre-clamping structure.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a precision tooling fixture with variable clamping force, including a mounting base, an adjustment structure mounted in the middle of the top surface of the mounting base, a driving structure mounted on the outer surface of the adjustment structure near the bottom end, and a clamping structure mounted on the top of the adjustment structure.

[0009] The clamping structure includes a clamping unit and a pre-clamping unit, wherein the pre-clamping unit is installed at the output end of the clamping unit.

[0010] The pre-clamping unit includes a clamping plate, a sliding rod is installed in the middle of the clamping plate, a spring is provided on the outside of the sliding rod, a clamping plate is installed at the end of the sliding rod near the spring, an airbag is installed in the middle of the clamping plate near the spring, and an air guide tube is installed on the top of the airbag.

[0011] Preferably, the clamping unit includes a mounting plate, a cylinder is mounted on the middle of the mounting plate near the top, a pressure relief pipe is connected to the input end of the cylinder, and a connecting block is mounted on the output end of the cylinder.

[0012] Preferably, the connecting block has a convex groove on the side away from the mounting plate, and the inner wall of the convex groove engages with the side of the clamping plate away from the spring. Both ends of the spring are fixedly connected to the clamping plate and the clip plate, respectively. The outer surface of the sliding rod is slidably connected to the middle of the clamping plate near the top and bottom through sliding holes. A pressure relief valve is installed on the pressure relief pipe, and the cylinder and pressure relief valve are controlled via a PLC controller and a pressure sensor.

[0013] Preferably, the drive structure includes an asynchronous motor, the output end of which is connected to a worm gear, a gear ring is connected to the outer surface of the worm gear, and a limit block is installed inside the gear ring.

[0014] Preferably, the bottom surface of the asynchronous motor is detachably connected to the top surface of the mounting base, the outer surface of the worm gear is meshed with the outer surface of the gear ring near the bottom end, and the bottom surface of the gear ring is rotatably connected to the top surface of the mounting base.

[0015] Preferably, the adjustment structure includes a clamping seat, an adjustment rod is installed inside the clamping seat, a gear is fixedly installed at one end of the adjustment rod away from the inside of the clamping seat, and a slider is connected to the outer surface of the adjustment rod.

[0016] Preferably, the outer surface of the gear meshes with the top of the gear ring; the outer surface of the clamping seat has a convex annular groove near its bottom end, which is slidably connected to the outer surface of the limiting block; the outer surface of the slider is slidably connected to the inner wall of the limiting groove in the clamping seat; the inside of the slider is threadedly connected to the outer surface of the adjusting rod; and the bottom surface of the clamping seat is fixedly connected to the middle of the top surface of the mounting seat. The top of the slider is fixedly connected to the bottom of the mounting plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This precision tooling fixture with variable clamping force, through the setting of the clamping structure, uses an air duct to inject air into the airbag, and uses the airbag to squeeze the clamping plate, thereby pre-clamping the workpiece to ensure the stability of the workpiece before clamping. Then, the cylinder is activated to drive the connecting block and the clamping plate to move, and the clamping plate is used to clamp and fix the workpiece.

[0019] 2. This precision tooling fixture with variable clamping force, through the setting of the drive structure and adjustment structure, starts the asynchronous motor to drive the worm gear to rotate, the worm gear drives the gear ring to rotate, the gear ring drives the four gears to rotate, thereby using the gears to drive the adjustment rod and the slider to transmit power, and adjust the position of the slider, thus making the clamping structure adaptable to workpieces of various sizes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 This is an enlarged view of the driving structure of this utility model;

[0022] Figure 3 This is an enlarged view of the adjustment and clamping structure of this utility model;

[0023] Figure 4 This is an enlarged view of the clamping structure of this utility model.

[0024] In the diagram: 1. Mounting base; 101. Asynchronous motor; 102. Worm gear; 103. Gear ring; 104. Limiting block; 201. Clamping seat; 202. Adjusting rod; 203. Gear; 204. Slider; 301. Mounting plate; 302. Cylinder; 303. Pressure relief pipe; 304. Connecting block; 305. Clamping plate; 306. Slide rod; 307. Spring; 308. Clamping plate; 309. Airbag; 310. Air guide pipe. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-4 This utility model provides a technical solution:

[0027] Example 1:

[0028] A precision tooling fixture with variable clamping force includes a mounting base 1, an adjustment structure mounted on the middle of the top surface of the mounting base 1, a driving structure mounted on the outer surface of the adjustment structure near the bottom end, and a clamping structure mounted on the top of the adjustment structure.

[0029] The clamping structure includes a clamping unit and a pre-clamping unit. The pre-clamping unit is installed at the output end of the clamping unit. The pre-clamping unit includes a clamping plate 305, a slide rod 306 is installed in the middle of the clamping plate 305, a spring 307 is provided on the outer side of the slide rod 306, a clamping plate 308 is installed at the end of the slide rod 306 near the spring 307, an airbag 309 is installed in the middle of the side of the clamping plate 305 near the spring 307, and an air guide tube 310 is installed on the top of the airbag 309. The clamping unit includes a mounting plate 301, a cylinder 302 is installed in the middle of the mounting plate 301 near the top, a pressure relief pipe 303 is connected to the input end of the cylinder 302, and a connecting block 304 is installed at the output end of the cylinder 302.

[0030] The connecting block 304 has a convex groove on the side away from the mounting plate 301. The inner wall of the convex groove is engaged with the side of the clamping plate 305 away from the spring 307. The two ends of the spring 307 are fixedly connected to the clamping plate 305 and the clamping plate 308 respectively. The outer surface of the slide rod 306 is slidably connected to the middle of the clamping plate 305 near the top and bottom with sliding holes.

[0031] By using the clamping structure, air is injected into the airbag 309 through the air pipe 310. The airbag 309 then presses the clamping plate 308, which pre-clamps the workpiece to ensure its stability before clamping. After that, the cylinder 302 is activated to move the connecting block 304 and the clamping plate 305, and the clamping plate 308 clamps and fixes the workpiece.

[0032] During pre-clamping of the workpiece, air is injected into the airbag 309 through the air pipe 310, causing the airbag 309 to inflate. This inflates the clamping plate 308, causing it to move and the slide rod 306 to slide. During the displacement, the clamping plate 308 stretches the spring 307, thus pre-clamping the workpiece and effectively ensuring its stability. When clamping and fixing the workpiece, the cylinder 302 is activated to move the connecting block 304. The connecting block 304 then moves the clamping plate 305, causing the clamping plate 308 to clamp and fix the workpiece. As the clamping force increases, the gas inside the airbag 309 is released through the air pipe 310, causing the slide rod 306 to slide. At the same time, the clamping plate 308 compresses the spring 307. Based on the air pressure input to the cylinder 302, the pressure detector and PLC controller open or close the pressure relief pipe 303, thereby effectively adjusting the clamping force.

[0033] Example 2:

[0034] Based on Embodiment 1, the drive structure includes an asynchronous motor 101, with a worm gear 102 connected to the output end of the asynchronous motor 101. A gear ring 103 is connected to the outer surface of the worm gear 102, and a limit block 104 is installed inside the gear ring 103. The bottom surface of the asynchronous motor 101 is detachably connected to the top surface of the mounting base 1, the outer surface of the worm gear 102 is meshed with the outer surface of the gear ring 103 near the bottom end, and the bottom surface of the gear ring 103 is rotatably connected to the top surface of the mounting base 1.

[0035] The adjustment structure includes a clamping seat 201, an adjusting rod 202 installed inside the clamping seat 201, a gear 203 fixedly installed at one end of the adjusting rod 202 away from the inside of the clamping seat 201, and a slider 204 connected to the outer surface of the adjusting rod 202. The outer surface of the gear 203 meshes with the top of the gear ring 103. The inner wall of the convex annular groove near the bottom of the outer surface of the clamping seat 201 is slidably connected to the outer surface of the limiting block 104. The outer surface of the slider 204 is slidably connected to the inner wall of the limiting groove in the clamping seat 201. The inside of the slider 204 is threadedly connected to the outer surface of the adjusting rod 202. The bottom surface of the clamping seat 201 is fixedly connected to the middle of the top surface of the mounting base 1.

[0036] By setting up the drive structure and adjustment structure, the asynchronous motor 101 is started to drive the worm gear 102 to rotate, the worm gear 102 drives the gear ring 103 to rotate, and the gear ring 103 drives the four gears 203 to rotate. Thus, the gears 203 drive the adjustment rod 202 and the slider 204 to transmit power, and adjust the position of the slider 204, thereby making the clamping structure adaptable to workpieces of various sizes.

[0037] When clamping workpieces of different sizes, the asynchronous motor 101 is started to drive the worm gear 102 to rotate. The worm gear 102 is meshed with the outer surface of the gear ring 103 near the bottom, and the limiting block 104 is slidably connected to the inner wall of the convex annular groove on the outer surface of the clamping seat 201 near the bottom. This drives the gear ring 103 to rotate. Since the top of the gear ring 103 is meshed with the outer surface of the gear 203, the gear ring 103 drives the gear 203 and the adjusting rod 202 to rotate when it rotates. At the same time, the outer surface of the adjusting rod 202 is threadedly connected to the slider 204, and the outer surface of the slider 204 is slidably connected to the inside of the limiting groove on the clamping seat 201. This causes the slider 204 to move the mounting plate 301, thereby adjusting the spacing between multiple clamping structures, thus achieving flexible clamping and adaptation of workpieces of various sizes.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A precision tooling fixture with variable clamping force, comprising a mounting base (1), characterized in that: An adjustment structure is installed in the middle of the top surface of the mounting base (1), a driving structure is installed on the outer surface of the adjustment structure near the bottom, and a clamping structure is installed on the top of the adjustment structure. The clamping structure includes a clamping unit and a pre-clamping unit, wherein the pre-clamping unit is installed at the output end of the clamping unit; The pre-clamping unit includes a clamping plate (305), a slide rod (306) is installed in the middle of the clamping plate (305), a spring (307) is provided on the outside of the slide rod (306), a clamping plate (308) is installed on the end of the slide rod (306) near the spring (307), an airbag (309) is installed in the middle of the side of the clamping plate (305) near the spring (307), and an air guide tube (310) is installed on the top of the airbag (309).

2. The precision tooling fixture with variable clamping force according to claim 1, characterized in that: The clamping unit includes a mounting plate (301), a cylinder (302) is mounted in the middle of the mounting plate (301) near the top, a pressure relief pipe (303) is connected to the input end of the cylinder (302), and a connecting block (304) is mounted on the output end of the cylinder (302).

3. A precision tooling fixture with variable clamping force according to claim 2, characterized in that: The connecting block (304) has a convex groove on the side away from the mounting plate (301). The inner wall of the convex groove is engaged with the side of the clamping plate (305) away from the spring (307). The two ends of the spring (307) are fixedly connected to the clamping plate (305) and the clamping plate (308) respectively. The outer surface of the slide rod (306) is slidably connected to the middle of the clamping plate (305) near the top and bottom of the sliding hole.

4. A precision tooling fixture with variable clamping force according to claim 1, characterized in that: The drive structure includes an asynchronous motor (101), the output end of which is connected to a worm gear (102), the outer surface of which is connected to a gear ring (103), and a limit block (104) is installed inside the gear ring (103).

5. A precision tooling fixture with variable clamping force according to claim 4, characterized in that: The bottom surface of the asynchronous motor (101) is detachably connected to the top surface of the mounting base (1), the outer surface of the worm (102) is meshed with the outer surface of the gear ring (103) near the bottom end, and the bottom surface of the gear ring (103) is rotatably connected to the top surface of the mounting base (1).

6. A precision tooling fixture with variable clamping force according to claim 1, characterized in that: The adjustment structure includes a clamping seat (201), an adjustment rod (202) is installed inside the clamping seat (201), a gear (203) is fixedly installed at one end of the adjustment rod (202) away from the inside of the clamping seat (201), and a slider (204) is connected to the outer surface of the adjustment rod (202).

7. A precision tooling fixture with variable clamping force according to claim 6, characterized in that: The outer surface of the gear (203) meshes with the top of the gear ring (103). The outer surface of the clamping seat (201) near the bottom has a convex annular groove inner wall that is slidably connected to the outer surface of the limiting block (104). The outer surface of the slider (204) is slidably connected to the inner wall of the limiting groove of the clamping seat (201). The inside of the slider (204) is threadedly connected to the outer surface of the adjusting rod (202). The bottom surface of the clamping seat (201) is fixedly connected to the middle of the top surface of the mounting seat (1).

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