Circumferential multi-directional clamping automated locking fixture

Abstract

This invention discloses a circumferential multi-directional clamping automated locking fixture, including a fixture base. Multiple clamping components are arranged above the fixture base, forming a clamping area. The fixture base has an inner cavity and a cover plate. A drive motor, a driving bevel gear, a driven bevel gear, a sliding bracket, a lead screw, and a sliding seat are installed within the inner cavity. Multiple driven bevel gears surround the outer periphery of the driving bevel gear and mesh with each other. The drive motor is connected to the driving bevel gear. Multiple lead screws are respectively connected to multiple driven bevel gears. Multiple sliding seats are respectively mounted on multiple lead screws. Multiple clamping components are respectively connected to multiple sliding seats. The drive motor is connected to a controller. This invention achieves reliable automated clamping of workpieces. It can achieve reliable automated clamping of products with different shapes and sizes but circumferential symmetry, demonstrating universality and enabling center positioning of regular-shaped products.

Description

Technical Field

[0001] This invention relates to a locking fixture mainly used for clamping, locking, and positioning electromechanical components, and more particularly to a circumferential multi-directional clamping automated locking fixture. Background Technology

[0002] In the electromechanical industry, the stable and reliable clamping and positioning of workpieces to be processed or products to be inspected is a common application scenario, depending on production needs. For example, during the assembly of a filter, its housing may need to be reliably clamped and positioned, or after assembly, it may need to be reliably clamped and positioned for electrical performance testing, in order to facilitate operations such as electron microscopy and X-ray inspection of the filter product.

[0003] Traditional locking clamps are generally designed for specific products or components, and have the following drawbacks: A single clamp is difficult to reliably hold products of different shapes, lacking universality; it cannot simultaneously clamp products from multiple circumferential directions, making it difficult to center the product; it typically uses manual locking, which is time-consuming, labor-intensive, and inefficient; the clamping torque cannot be adjusted or precisely controlled, potentially leading to instability or damage to products with varying load capacities; the clamping contact area for non-planar products is small, making multi-point locking impossible and hindering clamping stability control; and specific clamping structures must be designed for the clamping and positioning of irregularly shaped products, meaning a single clamp cannot reliably hold products of different shapes. Summary of the Invention

[0004] The purpose of this invention is to provide a universally applicable circumferential multi-directional clamping automatic locking fixture that can reliably clamp products of different shapes in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A circumferential multi-directional clamping automatic locking fixture includes a fixture base. Multiple circumferentially distributed clamping components are arranged above the fixture base, forming a clamping area for placing a workpiece. The fixture base has an open-topped inner cavity, with a cover plate installed at the upper end. A drive motor, a driving bevel gear, a driven bevel gear, a sliding bracket, a lead screw, and a sliding seat are installed within the inner cavity. Multiple driven bevel gears, with their centerlines oriented laterally, surround and mesh with the driving bevel gear, which has its centerline oriented vertically. The drive motor shaft, located below the driving bevel gear, is connected to the center hole of the driving bevel gear. Multiple lead screws, with their axial directions oriented laterally, are mounted on the sliding bracket via bearings. The bracket can rotate freely. One end of each of the multiple lead screws is connected to the center hole of a corresponding multiple driven bevel gears. The sliding seat is provided with a threaded through hole. The multiple sliding seats corresponding to the multiple lead screws are respectively fitted onto the multiple lead screws through their own threaded through holes. The sliding seat is connected to the sliding bracket and can only move in the axial direction of the corresponding lead screw. The lower ends of the multiple clamping components are respectively connected to the upper ends of the multiple corresponding multiple sliding seats through multiple connectors. The cover plate is provided with strip-shaped cover plate through holes at positions corresponding to the multiple connectors, and the multiple connectors pass through the multiple cover plate through holes. The clamping area is located above the cover plate. The control input terminal of the drive motor is connected to the control output terminal of the controller.

[0007] Preferably, to achieve controllable clamping force and multi-point locking for non-planar products, the clamping assembly includes a locking seat, telescopic rods, sealing sleeves, a hydraulic pump, a hydraulic solenoid valve, and a hydraulic sensor. The locking seat has multiple parallel hydraulic blind holes. Multiple tubular sealing sleeves are respectively installed in corresponding hydraulic blind holes near their openings. Multiple telescopic rods pass through the central through holes of corresponding sealing sleeves. An outer sealing ring is provided on the outer circumferential wall of each sealing sleeve. The outer sealing ring of the sleeve makes sealing contact with the corresponding wall of the hydraulic blind hole. An inner sealing ring is provided on the inner circumferential wall of the sleeve. The inner sealing ring makes sealing contact with the corresponding outer circumferential wall of the telescopic rod. A section of the telescopic rod near the closed end of the hydraulic blind hole has an enlarged outer diameter to form a limiting cylindrical section. Another section of the limiting cylindrical section near the closed end of the hydraulic blind hole has an enlarged outer diameter to form a hydraulically actuating cylindrical section. An outer sealing ring for the telescopic rod is provided on the outer circumferential wall of the hydraulically actuating cylindrical section. The outer sealing ring makes sealing contact with the corresponding wall of the hydraulic blind hole. The sealing contact is achieved by the limiting cylindrical section located outside the sealing sleeve, the diameter of which is larger than the inner diameter of the sealing sleeve. The locking seat is equipped with an extending hydraulic connector and a retracting hydraulic connector. The closed ends of multiple hydraulic blind holes are interconnected via a first channel within the locking seat and connected to the extending hydraulic connector. The positions of the multiple hydraulic blind holes near the corresponding sealing sleeves are interconnected via a second channel within the locking seat and connected to the retracting hydraulic connector. The extending hydraulic connector and the retracting hydraulic connector are respectively connected to the hydraulic pump via the hydraulic solenoid valve. The hydraulic sensor is installed in the hydraulic oil pipe between the hydraulic solenoid valve and the extending hydraulic connector or in the first channel. The hydraulic solenoid valve and the hydraulic pump are respectively mounted on the locking seat. The locking seat is connected to the corresponding sliding seat via the corresponding connector. The signal output terminal of the hydraulic sensor is connected to the signal input terminal of the controller. The control input terminal of the hydraulic pump and the control input terminal of the hydraulic solenoid valve are respectively connected to the control output terminal of the controller.

[0008] Preferably, in order to achieve high-precision control of the telescopic rod pressure, the extension hydraulic connector and the retraction hydraulic connector are respectively connected to two oil circuit connectors of the hydraulic solenoid valve, and the oil inlet and outlet of the hydraulic pump are respectively connected to the other two oil circuit connectors of the hydraulic solenoid valve.

[0009] Preferably, to facilitate the installation of the sealing sleeve and telescopic rod, the hydraulic blind hole is formed by connecting a large-diameter hole section near its open end and a small-diameter hole section near its closed end. The diameter of the large-diameter hole section is larger than that of the small-diameter hole section. The outer diameter of the sealing sleeve near the closed end of the hydraulic blind hole is reduced and is provided with an external thread, which is connected to the corresponding internal thread on the inner circumference of the small-diameter hole section through the external thread. The part of the sealing sleeve except for its external thread section is located inside the large-diameter hole section, and the limiting cylindrical section is located inside the small-diameter hole section.

[0010] Preferably, in order to achieve a more reliable hydraulic oil sealing function and improve sliding stability, the outer sealing ring and the inner sealing ring of the same sealing sleeve are both axially arranged in pairs, and the outer sealing ring of the same telescopic rod is also axially arranged in pairs.

[0011] Preferably, to allow the locking seat to have a wider range of movement in the axial direction of the lead screw to meet the clamping and locking requirements of products of different sizes, the clamping assembly also includes a limiting seat. The limiting seat has multiple rows of limiting seat teeth on its upper surface, and a limiting plate at one end of the locking seat. The limiting plate has multiple rows of limiting plate teeth on its lower surface. The limiting plate is located on top of the limiting seat and is connected by connecting screws. The multiple rows of limiting seat teeth and the multiple rows of limiting plate teeth are respectively connected in a corresponding manner. The limiting seat is connected to the corresponding sliding seat through the corresponding connecting piece.

[0012] Preferably, in order to provide better contact and buffering between the two ends of the telescopic rod and other corresponding components, a first buffer rubber pad is provided on the end of the telescopic rod corresponding to the open end of the hydraulic blind hole; and a second buffer rubber pad is provided on the end of the telescopic rod corresponding to the closed end of the hydraulic blind hole.

[0013] Preferably, to enable this fixture to reliably clamp and lock products of various shapes, the central hole of each driven bevel gear is connected to a connecting rod, and one end of each lead screw is connected to the corresponding connecting rod via a torque-adjustable coupling. The torque-adjustable coupling has an adjustable set torque value. When the pressure on the coupling is less than this set torque value, the coupling and the lead screw rotate synchronously, driving the sliding seat to move. When the pressure on the coupling is greater than this set torque value, the coupling and the lead screw no longer rotate synchronously; the lead screw does not rotate, and the sliding seat no longer moves.

[0014] Preferably, for ease of assembly, the sliding bracket includes sliding guide rails corresponding one-to-one with the plurality of sliding seats and a mounting frame. The plurality of sliding guide rails are located on the outer periphery of the mounting frame and are interconnected. The plurality of driven bevel gears and the driving bevel gear are all located within the mounting frame. The sliding guide rails are provided with coaxial guide rail holes. The upper wall of the guide rail hole is provided with a vertical opening groove through which the corresponding connecting member passes. The two transverse sides of the guide rail hole are respectively provided with transverse opening grooves. The two transverse sides of the sliding seat are respectively provided with rollers, which are respectively placed in the two transverse opening grooves of the corresponding sliding guide rail.

[0015] Preferably, in order to facilitate assembly and improve structural stability, there are four clamping components, four lead screws, four sliding seats and four sliding guides, which are evenly distributed on the outer periphery of the clamping area. Multiple sliding guides and the mounting frame are mounted on the same transverse support plate and the support plate is connected to the cavity wall of the clamping seat.

[0016] The beneficial effects of the present invention are:

[0017] This invention employs a drive motor to rotate an active bevel gear, which in turn drives multiple circumferentially distributed driven bevel gears to rotate synchronously. This, in turn, drives multiple lead screws to rotate synchronously, ultimately causing multiple sliding seats and multiple clamping components to move synchronously from multiple circumferential directions towards the central clamping area. This achieves reliable and automated clamping of the workpiece. It can reliably and automatically clamp products of different shapes and sizes but with circumferential symmetry, demonstrating universality. Furthermore, because it involves synchronous circumferential clamping, it can center-position regular-shaped products, and the clamping process is time-saving, labor-saving, simple, and efficient. The invention integrates components such as locking seats, telescopic rods, sealing sleeves, hydraulic pumps, hydraulic solenoid valves, and hydraulic sensors into a clamping assembly with hydraulic locking function and multiple independently extendable telescopic rods. It can automatically control the pressure on multiple telescopic rods through the cooperation of hydraulic sensors, hydraulic solenoid valves and controllers, thereby achieving adjustable and controllable clamping torque. For products with different load capacities, it can achieve stable clamping without damaging the product by adjusting the clamping torque. For non-planar products, multiple telescopic rods can be used to increase the clamping contact area, thereby achieving multi-point locking function and improving clamping stability. By connecting a torque-adjustable coupling between the lead screw and the driven bevel gear, the lead screw can automatically stop rotating when the pressure is too high, thereby achieving reliable clamping function for non-circumferentially symmetrical products, significantly improving the product's applicability and universality. Moreover, under the premise of the hydraulic control function of the above clamping components, it can reliably clamp irregular products of different shapes and sizes. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the circumferential multi-directional clamping automated locking fixture after assembly according to the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the circumferential multi-directional clamping automated locking fixture of the present invention after removing the cover plate;

[0020] Figure 3 This is a three-dimensional structural diagram of the circumferential multi-directional clamping automated locking fixture of the present invention after removing the cover plate and sliding bracket;

[0021] Figure 4 This is one of the three-dimensional structural schematic diagrams of the clamping component of the circumferential multi-directional clamping automatic locking fixture described in this invention, with the telescopic rod in the figure in the extended state;

[0022] Figure 5 This is a three-dimensional partial cross-sectional view of the clamping component of the circumferential multi-directional clamping automatic locking fixture of the present invention, with the telescopic rod in the extended state.

[0023] Figure 6 This is the second three-dimensional structural schematic diagram of the clamping component of the circumferential multi-directional clamping automatic locking fixture described in this invention, in which the telescopic rod is in the retracted state.

[0024] Figure 7 This is a three-dimensional structural diagram of the limiting seat of the clamping component of the circumferential multi-directional clamping automatic locking fixture described in this invention;

[0025] Figure 8 This is a three-dimensional structural diagram of the locking seat and limiting plate of the clamping assembly of the circumferential multi-directional clamping automated locking fixture described in this invention.

[0026] Figure 9 This is a three-dimensional structural diagram of the sealing sleeve of the clamping component of the circumferential multi-directional clamping automated locking fixture described in this invention;

[0027] Figure 10 This is a three-dimensional half-section structural diagram of the sealing sleeve of the clamping component of the circumferential multi-directional clamping automated locking fixture of the present invention.

[0028] Figure 11 This is a three-dimensional structural diagram of the telescopic rod of the clamping component of the circumferential multi-directional clamping automated locking fixture described in this invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] like Figure 1 , Figure 2 and Figure 3As shown, the circumferential multi-directional clamping automatic locking fixture of the present invention includes a fixture base 1. Multiple circumferentially distributed clamping components 4 are provided above the fixture base 1, forming a clamping area 5 for placing the workpiece. The fixture base 1 has an inner cavity with an upper opening. A cover plate 2 is installed at the upper end of the inner cavity. A drive motor (not visible in the figure, but easily understood), a driving bevel gear 13, driven bevel gears 12, a sliding bracket (refer to the sliding guide rail 6 and mounting frame 14 below), a lead screw 16, and a sliding seat 15 are installed inside the inner cavity. Multiple driven bevel gears 12, with a transverse centerline, surround the outer periphery of the driving bevel gear 13, which has a vertical centerline, and are meshed with each other. The shaft of the drive motor, located below the driving bevel gear 13, is connected to the central hole of the driving bevel gear 13. Multiple lead screws 16, with a transverse axial direction, are... The components are mounted on the sliding bracket via bearings (not visible in the figure, but easy to understand) and can rotate freely. One end of each of the multiple lead screws 16 is connected to the center hole of a corresponding multiple driven bevel gears 12. The sliding seat 15 is provided with threaded through holes. The multiple sliding seats 15, corresponding to the multiple lead screws 16, are respectively fitted onto the multiple lead screws 16 through their own threaded through holes. The sliding seats 15 are connected to the sliding bracket and can only move axially in the corresponding lead screw 16. The lower ends of the multiple clamping components 4 are respectively connected to the upper ends of the corresponding multiple sliding seats 15 through multiple connectors 9. The cover plate 2 is provided with strip-shaped cover plate through holes 3 at positions corresponding to the multiple connectors 9, and the multiple connectors 9 pass through the multiple cover plate through holes 3. The clamping area 5 is located above the cover plate 2. The control input end of the drive motor is connected to the control output end of the controller (not visible in the figure, but easy to understand).

[0031] like Figures 1-11 As shown, the present invention also discloses the following more optimized specific structures:

[0032] To achieve controllable clamping force and multi-point locking for non-planar products, the clamping assembly 4 includes a locking seat 19, telescopic rods 18, sealing sleeves 30, a hydraulic pump 24, a hydraulic solenoid valve 20, and a hydraulic sensor (not visible in the figure but easy to understand). The locking seat 19 has multiple parallel hydraulic blind holes 32. Multiple tubular sealing sleeves 30 are installed near their openings within corresponding hydraulic blind holes 32. Multiple telescopic rods 18 pass through the central through holes 37 of corresponding sealing sleeves 30. The outer circumference of the sealing sleeve 30 is marked with a sealing sleeve outer... A sealing ring 38 is provided on the outer sealing ring of the sealing sleeve, which is in sealing contact with the wall of the corresponding hydraulic blind hole 32. An inner sealing ring 36 is provided on the inner circumferential wall of the sealing sleeve 30, which is in sealing contact with the outer circumferential wall of the corresponding telescopic rod 18. The outer diameter of a section of the telescopic rod 18 near the closed end of the hydraulic blind hole 32 is increased to form a limiting cylindrical section 41. The outer diameter of a section of the limiting cylindrical section 41 near the closed end of the hydraulic blind hole 32 is increased to form a hydraulically driven cylindrical section 43. An outer sealing ring 42 is provided on the outer circumferential wall of the hydraulically driven cylindrical section 43, which is in sealing contact with the wall of the corresponding hydraulic blind hole. The sealing wall of the 32 is in sealing contact. The limiting cylindrical section 41 is located outside the sealing sleeve 30, and the diameter of the limiting cylindrical section 41 is larger than the inner diameter of the sealing sleeve 30. The locking seat 19 is provided with an extension hydraulic connector 22 and a retraction hydraulic connector 21. The closed ends of the multiple hydraulic blind holes 32 are interconnected through a first channel 33 provided in the locking seat 19 and connected to the extension hydraulic connector 22. The positions of the multiple hydraulic blind holes 32 near the corresponding sealing sleeve 30 are interconnected through a second channel 31 provided in the locking seat 19 and connected to the retraction hydraulic connector 21. The extension hydraulic connector 22 and the retraction hydraulic connector 21 are respectively connected by hydraulic... The hydraulic solenoid valve 20 is connected to the hydraulic pump 24 (the hydraulic oil pipe for connection is not shown in the figure). The hydraulic sensor is installed in the hydraulic oil pipe between the hydraulic solenoid valve 20 and the protruding hydraulic connector 22 or in the first channel 33. The hydraulic solenoid valve 20 and the hydraulic pump 24 are respectively installed on the locking seat 19. The locking seat 19 is connected to the corresponding sliding seat 15 through the corresponding connector 9. The signal output terminal of the hydraulic sensor is connected to the signal input terminal of the controller. The control input terminal of the hydraulic pump 24 and the control input terminal of the hydraulic solenoid valve 20 are respectively connected to the control output terminal of the controller.

[0033] To achieve high-precision pressure control of the telescopic rod 18, the extension hydraulic connector 22 and the retraction hydraulic connector 21 are respectively connected to two oil circuit connectors of the hydraulic solenoid valve 20 (forming one set of oil circuit connectors), and the oil inlet and outlet of the hydraulic pump 24 are respectively connected to the other two oil circuit connectors of the hydraulic solenoid valve 20 (forming another set of oil circuit connectors). When the hydraulic solenoid valve 20 is activated, it can switch the connection mode between the two sets of oil circuit connectors.

[0034] To facilitate the installation of the sealing sleeve 30 and the telescopic rod 18, the hydraulic blind hole 32 is formed by connecting a large-diameter hole section (not marked in the figure) near its open end and a small-diameter hole section (not marked in the figure) near its closed end. The diameter of the large-diameter hole section is larger than that of the small-diameter hole section. The outer diameter of the sealing sleeve 30 near the closed end of the hydraulic blind hole 32 is reduced and is provided with an external thread 39, which is connected to the corresponding internal thread on the inner circumference of the small-diameter hole section through the external thread 39. The part of the sealing sleeve 30 except for its external thread section is located inside the large-diameter hole section, and the limiting cylindrical section 41 is located inside the small-diameter hole section.

[0035] To achieve a more reliable hydraulic oil sealing function and improve sliding stability, the outer sealing ring 38 and the inner sealing ring 36 of the same sealing sleeve 30 are both arranged axially, and the outer sealing ring 42 of the same telescopic rod 18 is also arranged axially.

[0036] To allow the locking seat 19 to have a wider range of movement along the axial direction of the lead screw 16 to meet the clamping and locking requirements of products of different sizes, the clamping assembly 4 also includes a limiting seat 29. The limiting seat 29 has multiple rows (four rows in the figure, with two rows forming a group) of limiting seat teeth 34 on its upper surface. The limiting seat 29 has bosses 27 on both sides of its upper surface, with a limiting seat slot 28 in the center of each boss 27. Each boss 27 has two rows of limiting seat teeth 34. A limiting plate 25 is provided at one end of the locking seat 19. Multiple rows (four rows in the figure, with two rows forming a group) of limiting plate teeth 35 are provided below the limiting plate 25. Each group of limiting plate teeth... The two limiting plates of the protruding teeth 35 are provided with a limiting plate strip-shaped through hole 26. The limiting plate 25 is located on the limiting seat 29 and is connected by connecting screws 23 (two connecting screws in the figure, which pass through the limiting plate strip-shaped through hole 26 between the two rows of limiting plate protruding teeth 35 and the limiting seat strip-shaped through hole 28 between the two rows of limiting seat protruding teeth 34 and are connected to the corresponding screw holes on the limiting seat 29). The multiple rows of limiting seat protruding teeth 34 and the multiple rows of limiting plate protruding teeth 35 are respectively matched and connected. The limiting seat 29 is connected to the corresponding sliding seat 15 through the corresponding connecting piece 9.

[0037] In order to provide better contact buffering between the two ends of the telescopic rod 18 and other corresponding components, a first buffer rubber pad 40 is provided on the end of the telescopic rod 18 corresponding to the open end of the hydraulic blind hole 32; a second buffer rubber pad 44 is provided on the end of the telescopic rod 18 corresponding to the closed end of the hydraulic blind hole 32.

[0038] To enable this fixture to reliably clamp and lock products of various shapes, the center hole of each driven bevel gear 12 is connected to a connecting rod (not marked in the figure), and one end of each lead screw 16 is connected to the corresponding connecting rod via a torque-adjustable coupling 17. The torque-adjustable coupling 17 has an adjustable set torque value. When the pressure on the coupling 17 is less than this set torque value, the coupling 17 and the lead screw 16 rotate synchronously, driving the sliding seat 15 to move. When the pressure on the coupling 17 is greater than this set torque value, the coupling 17 and the lead screw 16 no longer rotate synchronously, the lead screw 16 does not rotate, and the sliding seat 15 no longer moves.

[0039] For ease of assembly, the sliding bracket includes a sliding guide rail 6 corresponding to a plurality of sliding seats 15 and a mounting frame 14. The plurality of sliding guide rails 6 are located on the outer periphery of the mounting frame 14 and are interconnected. A plurality of driven bevel gears 12 and driving bevel gears 13 are located within the mounting frame 14. The sliding guide rail 6 is provided with a coaxial guide rail hole (not marked in the figure). The upper wall of the guide rail hole is provided with a vertical opening groove 7 and the corresponding connecting piece 9 passes through the vertical opening groove 7. The two transverse sides of the guide rail hole are respectively provided with transverse opening grooves 8. Rollers 10 are respectively provided on the two transverse sides of the sliding seat 15. The rollers 10 on the two transverse sides of the sliding seat 15 are respectively placed in the two transverse opening grooves 8 of the corresponding sliding guide rail 6.

[0040] To facilitate assembly and improve structural stability, there are four clamping components 4, lead screw 16, sliding seat 15 and sliding guide rail 6, which are evenly distributed on the outer periphery of the clamping area 5. Multiple sliding guide rails 6 and mounting frame 14 are mounted on the same transverse support plate 11, and the support plate 11 is connected to the cavity wall of the clamp seat.

[0041] like Figures 1-11As shown, in application, first, based on the approximate size of the workpiece to be clamped (not shown in the figure), control the drive motor to position multiple clamping components 4 in appropriate positions so that the lateral dimension of the clamping area 5 is significantly larger than the maximum lateral dimension of the workpiece. If multiple clamping components 4 are not located on the same circumference of a virtual circle, they can be reset by clamping a circumferentially symmetrical workpiece (such as a cube or cylinder). The controller controls the hydraulic pump 24 and the hydraulic solenoid valve 20 to first extend all the telescopic rods 18. The controller then presets the pressure applied by the telescopic rods 18 after they extend and clamp the workpiece. The torque value of the coupling 17 is adjusted to be less than the pressure value after the telescopic rod 18 extends and clamps the workpiece. If the workpiece is too small or too large, the connecting screw 23 needs to be adjusted to change the relative position between the limiting plate 25 and the limiting seat 29 so that the clamping area 5 formed by the multiple clamping components 4 meets the size requirements. The workpiece to be clamped and locked is placed in the clamping area 5. Then, the drive motor drives the active bevel gear 13 to rotate, which drives multiple circumferentially distributed driven bevel gears 12 to rotate synchronously, thereby driving multiple lead screws 16 to rotate synchronously. Since the sliding seat 15 can only be on the corresponding lead screw, The axial movement of screw 16 is not rotatable, so the rotation of multiple screws 16 will drive multiple sliding seats 15 and multiple clamping assemblies 4 to move synchronously from multiple circumferential directions towards the clamping area 5 at the center position. After the telescopic rods 18 that have moved to partial or complete contact with the workpiece are in contact with the workpiece, if the workpiece is a regular product with circumferential symmetry and a flat outer surface (such as a cube), then all telescopic rods 18 will be subjected to the same pressure. Before the pressure on the telescopic rods 18 reaches the preset pressure value, the controller controls the hydraulic solenoid valve 20 to change the oil circuit according to the pressure sensor information, so that the pressure on all telescopic rods 18 is the preset pressure value. At this point, reliable clamping and locking of the workpiece is achieved, and the center positioning function is realized. If the workpiece is a regular product with circumferential symmetry and a non-planar outer surface (such as a cylindrical product), the pressure on the telescopic rods 18 at different positions will be different. Before the pressure on the telescopic rods 18 reaches the preset pressure value, the controller controls the hydraulic solenoid valve 20 to change the oil circuit according to the pressure sensor information. Since multiple telescopic rods 18 will eventually be subjected to the same pressure due to the same hydraulic oil pressure, the pressure on all telescopic rods 18 will eventually reach the preset pressure value. At this point, reliable clamping and locking of the workpiece is achieved, and the center positioning function is realized.If the workpiece is a non-circumferentially symmetrical irregularly shaped product, the contact time between the telescopic rods 18 of different clamping components 4 and the workpiece will be different. When the pressure on the telescopic rod 18 of any clamping component 4 exceeds the torque value of the coupling 17, the corresponding coupling 17 will no longer drive the corresponding lead screw 16 to rotate, and the corresponding sliding seat 15 and clamping component 4 will no longer move. However, the other clamping components 4 will continue to move until all clamping components 4 are in contact with the corresponding workpiece. Then, the controller controls the hydraulic solenoid valve 20 to change the oil circuit according to the pressure sensor information, so that the pressure on all telescopic rods 18 is the preset pressure value. At this time, reliable clamping and locking of the workpiece is achieved, but it is difficult to achieve the center positioning function.

[0042] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A circumferential multi-directional clamping automated locking fixture, comprising a fixture base, wherein a plurality of circumferentially distributed clamping components are disposed above the fixture base, and the plurality of clamping components form a clamping area for placing a workpiece to be clamped, characterized in that: The clamping seat has an inner cavity with an open top. A cover plate is installed on the upper end of the inner cavity. A drive motor, a driving bevel gear, a driven bevel gear, a sliding bracket, lead screws, and a sliding seat are installed inside the inner cavity. Multiple driven bevel gears, with their centerlines oriented laterally, surround the outer periphery of the driving bevel gear, which has its centerline oriented vertically, and are meshed with each other. The shaft of the drive motor, located below the driving bevel gear, is connected to the center hole of the driving bevel gear. Multiple lead screws, with their axial directions oriented laterally, are mounted on the sliding bracket via bearings and can rotate freely. One end of each lead screw is connected to a corresponding driven bevel gear. The wheel is connected to the center hole. The sliding seat is provided with a threaded through hole. Multiple sliding seats corresponding to multiple lead screws are respectively fitted onto multiple lead screws through their own threaded through holes. The sliding seat is connected to the sliding bracket and can only move in the axial direction of the corresponding lead screw. The lower ends of multiple clamping components are respectively connected to the upper ends of multiple corresponding sliding seats through multiple connectors. The cover plate is provided with strip-shaped cover plate through holes at positions corresponding to multiple connectors, and multiple connectors pass through multiple cover plate through holes. The clamping area is located above the cover plate. The control input terminal of the drive motor is connected to the control output terminal of the controller.The clamping assembly includes a locking seat, telescopic rods, sealing sleeves, a hydraulic pump, a hydraulic solenoid valve, and a hydraulic sensor. The locking seat has multiple parallel hydraulic blind holes. Multiple tubular sealing sleeves are respectively installed in the corresponding hydraulic blind holes near their opening ends. Multiple telescopic rods pass through the central through holes of the corresponding sealing sleeves. An outer sealing ring is provided on the outer circumference of each sealing sleeve, and the outer sealing ring makes sealing contact with the wall of the corresponding hydraulic blind hole. An inner sealing ring is provided on the inner circumference of the telescopic rod. The inner sealing ring of the sealing sleeve is in sealing contact with the outer circumference of the corresponding telescopic rod. A section of the telescopic rod near the closed end of the hydraulic blind hole has an enlarged outer diameter to form a limiting cylindrical section. A section of the limiting cylindrical section near the closed end of the hydraulic blind hole has an enlarged outer diameter to form a hydraulically pushing cylindrical section. An outer sealing ring of the telescopic rod is provided on the outer circumference of the hydraulically pushing cylindrical section. The outer sealing ring of the telescopic rod is in sealing contact with the hole wall of the corresponding hydraulic blind hole. The limiting cylindrical section is located within the sealing sleeve. In addition, the diameter of the limiting cylindrical section is larger than the inner diameter of the sealing sleeve. The locking seat is provided with an extension hydraulic connector and a retraction hydraulic connector. The closed ends of the plurality of hydraulic blind holes are interconnected through a first channel provided in the locking seat and connected to the extension hydraulic connector. The positions of the plurality of hydraulic blind holes near the corresponding sealing sleeves are interconnected through a second channel provided in the locking seat and connected to the retraction hydraulic connector. The extension hydraulic connector and the retraction hydraulic connector are respectively connected to the hydraulic pump through the hydraulic solenoid valve. The hydraulic sensor is installed in the hydraulic oil pipe between the hydraulic solenoid valve and the extension hydraulic connector or in the first channel. The hydraulic solenoid valve and the hydraulic pump are respectively installed on the locking seat. The locking seat is connected to the corresponding sliding seat through the corresponding connector. The signal output terminal of the hydraulic sensor is connected to the signal input terminal of the controller. The control input terminal of the hydraulic pump and the control input terminal of the hydraulic solenoid valve are respectively connected to the control output terminal of the controller.

2. The circumferential multi-directional clamping automated locking fixture according to claim 1, characterized in that: The extending hydraulic connector and the retracting hydraulic connector are respectively connected to two oil circuit connectors of the hydraulic solenoid valve, and the oil inlet and outlet of the hydraulic pump are respectively connected to the other two oil circuit connectors of the hydraulic solenoid valve.

3. The circumferential multi-directional clamping automated locking fixture according to claim 1, characterized in that: The hydraulic blind hole is formed by connecting a large-diameter hole section near its open end and a small-diameter hole section near its closed end. The diameter of the large-diameter hole section is larger than that of the small-diameter hole section. The outer diameter of the sealing sleeve near the closed end of the hydraulic blind hole is reduced and is provided with an external thread, which is connected to the corresponding internal thread on the inner circumference of the small-diameter hole section through the external thread. The part of the sealing sleeve except for its external thread section is located inside the large-diameter hole section, and the limiting cylindrical section is located inside the small-diameter hole section.

4. The circumferential multi-directional clamping automated locking fixture according to claim 1, characterized in that: The outer sealing ring and the inner sealing ring of the same sealing sleeve are both arranged axially, and the outer sealing ring of the same telescopic rod is also arranged axially.

5. The circumferential multi-directional clamping automatic locking fixture according to claim 1, characterized in that: The clamping assembly also includes a limiting seat, the upper part of which is provided with multiple rows of limiting seat teeth, one end of the locking seat is provided with a limiting plate, the lower part of which is provided with multiple rows of limiting plate teeth, the limiting plate is located on the upper part of the limiting seat and is connected by connecting screws, the multiple rows of limiting seat teeth and the multiple rows of limiting plate teeth are respectively connected in corresponding manner, and the limiting seat is connected to the corresponding sliding seat through the corresponding connecting member.

6. The circumferential multi-directional clamping automatic locking fixture according to claim 1, characterized in that: A first buffer rubber pad is provided at one end of the telescopic rod corresponding to the open end of the hydraulic blind hole; a second buffer rubber pad is provided at one end of the telescopic rod corresponding to the closed end of the hydraulic blind hole.

7. The circumferential multi-directional clamping automated locking fixture according to any one of claims 1-6, characterized in that: The center hole of each driven bevel gear is connected to a connecting rod, and one end of each lead screw is connected to the corresponding connecting rod through a torque-adjustable coupling.

8. The circumferential multi-directional clamping automated locking fixture according to any one of claims 1-6, characterized in that: The sliding bracket includes sliding guide rails corresponding one-to-one with the plurality of sliding seats and a mounting frame. The plurality of sliding guide rails are located on the outer periphery of the mounting frame and are interconnected. The plurality of driven bevel gears and the driving bevel gear are all located within the mounting frame. The sliding guide rails are provided with coaxial guide rail holes. The upper wall of the guide rail hole is provided with a vertical opening groove, and the corresponding connecting member passes through the vertical opening groove. The two side walls of the guide rail hole are respectively provided with horizontal opening grooves. The two side walls of the sliding seat are respectively provided with rollers, and the rollers on the two side walls of the sliding seat are respectively placed in the two horizontal opening grooves of the corresponding sliding guide rail.

9. The circumferential multi-directional clamping automated locking fixture according to claim 8, characterized in that: The clamping assembly, the lead screw, the sliding seat, and the sliding guide rail are all four in number and are evenly distributed on the outer periphery of the clamping area. Multiple sliding guide rails and the mounting frame are all mounted on the same horizontal support plate, and the support plate is connected to the cavity wall of the clamp seat.

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