A machining fixture to prevent accidental loosening

Abstract

This utility model relates to a machining fixture for preventing accidental loosening, comprising a worm gear and a worm shaft that drives its rotation. Several rotating wheels are arranged in a circular array on one side of the worm gear. A fan-shaped clamping block is provided beside each rotating wheel, with the outer arc surface of the clamping block abutting against the rotating wheel. A slider is fixed to the end face of each clamping block, and the slider is embedded in a positioning disk parallel to the worm gear and slidably connected to the positioning disk. A positioning hole is provided through the center of the positioning disk. This machining fixture has a simple structure. Through the cooperation between the rotating wheels and the clamping blocks, the rotating wheels can push or release the clamping blocks by rotation, ensuring effective clamping of the workpiece, preventing accidental loosening, and improving the stability and safety of the workpiece during machining.

Description

Technical Field

[0001] This utility model relates to a machining fixture to prevent accidental loosening. Background Technology

[0002] In the field of machining, fixtures are essential devices used to fix and position workpieces for various machining operations. With the continuous development of the machining industry, the requirements for machining accuracy and production efficiency are increasing, while higher standards are also being set for the stability and safety of workpieces during machining. Existing machining fixtures have some shortcomings in practical use. The clamping force of some fixtures on the workpiece is not stable enough, and during machining, factors such as cutting forces and vibrations can easily lead to the workpiece accidentally loosening. Once the workpiece loosens, it not only affects the machining accuracy and quality, resulting in non-compliant parts and wasting raw materials and time, but it can also cause safety accidents, threatening the personal safety of operators.

[0003] A search revealed Chinese Patent Publication No. CN222449301U, which discloses a machining fixture designed to prevent accidental loosening. This fixture, belonging to the field of machining fixtures, includes a fixture body, a lifting rod, and a vertical plate. The bottom of the fixture body has a support column, and a support platform is fixedly connected to the top of the support column. A hollow rod is located at the center of the support platform, and the lifting rod is movably connected inside the hollow rod. A fixed plate is located above the lifting rod, and a limit block is located above the fixed plate. The limit blocks are engaged with each other by a locking block, and a limit support plate is welded to one side of the locking block. This machining fixture, by incorporating a limit support plate and clamping components, stably clamps the workpiece during machining, preventing accidental loosening. This makes the overall structure more stable, provides some protection for the workpiece, and facilitates the use of the machining fixture by operators.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: the clamping force adjustment of the aforementioned devices is not flexible enough and it is difficult to adapt to workpieces of different sizes and shapes; the degree of automation of the clamping mechanism is low, it relies on manual operation and is inefficient; frictional wear is easily generated during the clamping process, affecting the service life of the fixture, and it is impossible to flexibly and accurately adjust the clamping force and position according to the special needs of different workpieces. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a machining fixture that prevents accidental loosening, which is not only reasonably structured, but also safe and convenient.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a machining fixture for preventing accidental loosening, including a worm gear and a worm that drives its rotation. Several rotating wheels are arranged in a circular array on one side of the worm gear. A fan-shaped clamping block is provided on the side of each rotating wheel. The outer arc surface of the clamping block abuts against the rotating wheel. A slider is fixed on the end face of each clamping block. The slider is embedded in a positioning disk arranged parallel to the worm gear and is slidably connected to the positioning disk. A positioning hole is opened through the center of the positioning disk.

[0007] Furthermore, the outer arc surface of the clamping block and the outer periphery of the rotating wheel are both provided with anti-slip grooves at intervals, and the anti-slip grooves on the clamping block and the rotating wheel are staggered.

[0008] Furthermore, the inner sides of the clamping blocks are all arc-shaped to clamp the workpiece with radial displacement.

[0009] Furthermore, the positioning disk is provided with a plurality of radially extending limiting grooves in a circular array for the sliding of the slider, and the limiting grooves are provided one-to-one with the slider.

[0010] Furthermore, each of the limiting grooves has a limiting rod extending radially through the slider and slidably connected to the slider, with both ends of the limiting rod fixed to the end of the limiting groove.

[0011] Furthermore, a spring is coaxially sleeved on the outside of the limiting rod, and the two ends of the spring are respectively abutted against the limiting groove and the slider.

[0012] Furthermore, a rotating ring is coaxially fixed to the end face of the worm gear. The rotating ring is fixed to the worm gear by bolts. The rotating ring is provided with a number of locking holes at intervals for the rotating wheel to be inserted and fixed. Each side of the rotating wheel has an axially protruding insertion rod that is inserted into the locking hole.

[0013] Furthermore, both ends of the worm are rotatably connected to bearing side plates, with one end of the worm passing through the bearing side plate and connecting to the servo motor. The servo motor and the bottom of the bearing side plate are both fixedly connected to the base plate.

[0014] Furthermore, a support side plate parallel to the worm gear and used to support the fixed positioning plate is fixed on the base plate.

[0015] Furthermore, the clamping block array is provided in three sets, and the corresponding rotating wheel is also provided in three sets. The worm gear has a through hole in the center for the workpiece to pass through.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model, by setting up a positioning plate, a limiting groove, a limiting rod, a slider, a spring, a clamping block, and a rotating wheel, utilizes the cooperative relationship between the rotating wheel and the clamping block to allow the rotating wheel to push or release the clamping block through rotation. When the rotating wheel rotates, its contact surface with the clamping block pushes the clamping block to slide along the limiting rod within the limiting groove, compressing or stretching the spring. This achieves the effect of clamping or releasing the workpiece within the positioning hole through the rotation of the rotating wheel, ensuring effective clamping of the workpiece.

[0017] 2. This utility model, by incorporating components such as a rotating ring, a locking hole, a worm gear, a worm, a servo motor, and a bearing side plate, utilizes the interplay between the worm gear and the worm to enable the servo motor to drive the worm to rotate, which in turn drives the worm gear and the rotating ring to rotate. The rotating ring, through the locking hole, drives the rotating wheel to rotate, thereby controlling the clamping block. This allows the device to precisely control the clamping force and state of the workpiece via the servo motor, preventing accidental loosening and improving the stability and safety of the workpiece during processing.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a perspective view of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the internal structure of an embodiment of the present utility model; Figure 4 This is a schematic diagram illustrating the cooperation between the rotating wheel and the slider in an embodiment of this utility model; Figure 5 This is a schematic diagram showing the cooperation between the rotating wheel and the locking hole in an embodiment of this utility model.

[0020] In the diagram: 1. Base plate; 2. Support side plate; 301. Positioning plate; 302. Limiting groove; 303. Positioning hole; 304. Limiting rod; 305. Slider; 306. Spring; 307. Clamping block; 308. Rotary wheel; 309. Rotary ring; 310. Locking hole; 311. Worm gear; 312. Worm; 313. Servo motor; 314. Bearing side plate; 315. Anti-slip groove; 316. Insert rod; 317. Through hole. Detailed Implementation

[0021] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0022] like Figures 1-5As shown, a machining fixture for preventing accidental loosening includes a worm gear 311 and a worm 312 that drives its rotation. Several rotating wheels 308 are arranged in a circular array on one side of the worm gear. A fan-shaped clamping block 307 is provided on the side of each rotating wheel. The outer arc surface of the clamping block abuts against the rotating wheel. A slider 305 is fixedly provided on the end face of each clamping block. The slider is embedded in a positioning disk 301 arranged parallel to the worm gear and is slidably connected to the positioning disk. A positioning hole 303 is provided through the center of the positioning disk.

[0023] In this embodiment of the utility model, the outer arc surface of the clamping block and the outer periphery of the rotating wheel are both provided with anti-slip grooves 315 at intervals, and the anti-slip grooves on the clamping block and the rotating wheel are staggered.

[0024] In this embodiment of the invention, the inner side of each clamping block is an arc surface to clamp the workpiece with radial displacement.

[0025] In this embodiment of the utility model, the positioning disk is provided with a plurality of radially extending limiting grooves 302 arranged in a circular array for sliding of the slider, and the limiting grooves are provided one-to-one with the slider.

[0026] In this embodiment of the utility model, each of the limiting grooves has a limiting rod 304 extending radially through the slider and slidably connected to the slider, and both ends of the limiting rod are fixedly connected to the end of the limiting groove.

[0027] In this embodiment of the utility model, a spring 306 is coaxially sleeved on the outside of the limiting rod, and the two ends of the spring are respectively abutted on the limiting groove and the slider.

[0028] In this embodiment of the utility model, a rotating ring 309 is coaxially fixed to the end face of the worm gear. The rotating ring is fixed to the worm gear by bolts. A plurality of locking holes 310 are provided on the rotating ring at intervals for the rotating wheel to be inserted and fixed. A plug rod 316 protrudes axially from one side of the rotating wheel and is inserted into the locking hole.

[0029] In this embodiment of the utility model, both ends of the worm are rotatably connected to bearing side plates 314, one end of the worm passing through the bearing side plate and connected to the servo motor 313, and the servo motor and the bottom of the bearing side plate are both fixedly connected to the base plate 1.

[0030] In this embodiment of the utility model, a support side plate 2 is fixed on the base plate, which is parallel to the worm gear and is used to support the fixed positioning plate.

[0031] In this embodiment of the utility model, the clamping block array is provided in three sets, and the corresponding rotating wheel is also provided in three sets. The worm gear has a through hole 317 for the workpiece to pass through.

[0032] In this embodiment of the utility model, the rotating ring 309 is coaxially fixed to the worm gear 311 by bolts. The bottom of the worm gear 311 is engaged with a worm 312 for transmission. The worm 312 is fixedly connected to the output shaft of the servo motor 313. The servo motor 313 is fixedly installed on one side of the bearing side plate 314. The worm 312 is rotatably installed on the bearing side plate 314 through the bearing. The bearing side plate 314 is fixedly installed on the side of the support side plate 2.

[0033] In this embodiment of the utility model, an annular transition ring is provided between the worm gear 311 and the positioning disk 301. The worm gear 311, the positioning disk 301 and the annular transition ring together constitute an annular cavity structure for accommodating the rotating ring 309.

[0034] In this embodiment of the utility model, the diameter of the positioning hole 303 is larger than the maximum outer diameter of the part to be clamped, and the limiting groove 302 is distributed radially at equal angles with the positioning hole 303 as the center.

[0035] In this embodiment of the utility model, the contact surface between the clamping block 307 and the rotating wheel 308 is an involute arc surface, and the height difference between the highest point of the center of the arc surface and the lowest points on both sides is equal to the maximum displacement stroke of the clamping block 307 along the limiting slide groove 302.

[0036] In this embodiment of the utility model, the contact surfaces of the rotating wheel 308 and the clamping block 307 are provided with staggered anti-slip grooves, and the spring 306 drives the clamping block 307 away from the positioning hole 303 in its natural state.

[0037] When the rotating wheel 308 rotates, it contacts the involute arc surface of the clamping block 307. As the rotating wheel 308 rotates, it pushes the clamping block 307 to overcome the force of the spring 306 and move along the limiting slide groove 302 to the positioning hole 303, thereby clamping the workpiece in the positioning hole 303 and ensuring that the workpiece will not be accidentally loosened due to external force during the processing.

[0038] When the servo motor 313 drives the worm gear 312 to rotate, the meshing worm wheel 311 drives the rotating ring 309 and the rotating wheel 308 to rotate synchronously. This design achieves precise control of the rotation of the rotating wheel 308. Compared with manual operation, the servo motor 313 can precisely adjust the rotation angle and speed of the rotating wheel 308 according to the processing requirements, thereby precisely controlling the clamping force of the clamping block 307 on the workpiece. Under different processing techniques, whether it is fine-tuning of the clamping force for fine processing or strengthening of the clamping force for heavy processing, this device can effectively prevent the workpiece from accidentally loosening during processing through precise control, greatly improving the stability and safety of processing.

[0039] Working principle of this utility model embodiment: First, the workpiece to be processed is placed in the positioning hole 303 in the center of the positioning plate 301. The diameter of the positioning hole 303 is larger than the maximum outer diameter of the part to be clamped, which can accommodate workpieces of various sizes and provide basic positioning for subsequent clamping operations.

[0040] Next, the servo motor 313 is started. The output shaft of the servo motor 313 drives the worm 312 to rotate. Since the worm 312 meshes with the worm wheel 311, the rotation of the worm 312 drives the worm wheel 311 to rotate. This step realizes the transmission and conversion of power.

[0041] Next, the rotating ring 309, which is coaxially fixed to the worm gear 311, rotates. The rotating ring 309 is engaged with the rotating wheel 308 through the retaining hole 310, so that the rotating wheel 308 starts to rotate under the drive of the rotating ring 309. This series of transmission structures accurately transmits the power of the servo motor 313 to the rotating wheel 308.

[0042] Next, as the rotating wheel 308 rotates, it contacts and interacts with the involute arc surface of the clamping block 307. In conjunction with the radial limiting design of the limiting groove, the rotating wheel 308 pushes the clamping block 307 during rotation, causing the clamping block 307 to overcome the elastic force of the spring 306 and move along the limiting groove 302 toward the positioning hole 303. The spring 306 plays a role in buffering and providing restoring force during this process.

[0043] Finally, multiple clamping blocks 307 move synchronously toward the positioning hole 303 to clamp the workpiece to be processed. During the processing, the servo motor 313 can precisely adjust the rotation angle and speed according to different processing requirements. Through the above transmission relationship, the clamping force of the clamping blocks 307 on the workpiece is precisely controlled, effectively preventing the workpiece from accidentally loosening during processing and ensuring the stability and safety of processing.

[0044] This utility model is not limited to the preferred embodiment described above. Anyone can derive other forms of machining fixtures to prevent accidental loosening based on the teachings of this utility model. All equivalent variations and modifications made within the scope of the claims of this utility model should be considered within the scope of this utility model.

Claims

1. A machining fixture designed to prevent accidental loosening, characterized in that: It includes a worm gear and a worm that drives its rotation. The worm gear has several rotating wheels arranged in a circular array on one side. Each rotating wheel has a fan-shaped clamping block on its side. The outer arc surface of the clamping block abuts against the rotating wheel. Each clamping block has a slider fixed on its end face. The slider is embedded in a positioning disk arranged parallel to the worm gear and is slidably connected to the positioning disk. The positioning disk has a positioning hole through its center.

2. A mechanical workholding fixture that prevents accidental release as in claim 1, wherein: The outer arc surface of the clamping block and the outer circumference of the rotating wheel are both provided with anti-slip grooves at intervals, and the anti-slip grooves on the clamping block and the rotating wheel are staggered.

3. A mechanical workholding fixture that prevents accidental release as in claim 2, wherein: The inner sides of the clamping blocks are all arc-shaped to clamp the workpiece with radial displacement.

4. A mechanical workholding clamp that prevents accidental release according to claim 1, wherein: The positioning disk is provided with several radially extending limiting grooves in a circular array to allow the slider to slide. The limiting grooves are provided one-to-one with the slider.

5. A mechanical workholding clamp that prevents accidental release according to claim 4, wherein: Each of the limiting grooves has a limiting rod extending radially through the slider and slidably connected to the slider, with both ends of the limiting rod fixed to the end of the limiting groove.

6. A mechanical workholding clamp that prevents accidental release according to claim 5, wherein: A spring is coaxially sleeved on the outside of the limiting rod, and the two ends of the spring are respectively abutted against the limiting groove and the slider.

7. A mechanical workholding clamp that prevents accidental release according to claim 1, wherein: A rotating ring is coaxially fixed to the end face of the worm gear. The rotating ring is provided with several locking holes at intervals for the rotating wheel to be inserted and fixed. Each rotating wheel has an axially protruding insertion rod on one side that is inserted into the locking hole.

8. A mechanical workholding clamp that prevents accidental release according to claim 1, wherein: Both ends of the worm gear are rotatably connected to bearing side plates. One end of the worm gear passes through the bearing side plate and is connected to the servo motor. The servo motor and the bottom of the bearing side plate are both fixed to the base plate.

9. A mechanical working clamp against accidental release according to claim 8, characterized in that: The base plate is fixed with a support side plate that is parallel to the worm gear and is used to support the fixed positioning plate.

10. A mechanical working clamp for preventing accidental release according to claim 1, characterized in that: The clamping block array is provided in three sets, and the corresponding rotating wheel is also provided in three sets.

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