High-precision clamping jig for workpiece
Through the design of high-precision clamping fixtures and the combination of limit devices and pressure sensors, the positioning and synchronous processing problems of the workpiece during the processing are solved, achieving precise processing effects and safety guarantees.
Patent Information
- Application Number
- CN202423049675.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-11
AI Technical Summary
During the machining of mechanical parts, existing fixtures cannot guarantee the overall fixation and machining accuracy of the workpiece, which may lead to deviations, affect quality and threaten personal safety.
A high-precision clamping fixture was designed, which adopted a combination of a limit device, a fixture holder, a laser rangefinder and a pressure sensor. Through the cooperation of a threaded rod, a telescopic cylinder and a pressure sensor, the precise positioning and synchronous processing of the U-shaped workpiece were achieved.
It realizes precise positioning and synchronous processing of workpieces, reduces limit deviation and overload pressure, and ensures processing accuracy and safety.
Smart Images
Figure CN223476941U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tooling technology, and in particular to a high-precision clamping fixture for workpieces. Background Technology
[0002] Generally, when processing and producing mechanical parts, it is necessary to use a fixture to fix them in place to prevent deviations from occurring during the processing and production process that could affect the quality of the workpiece. For mechanical workpieces, it is even more necessary to use a fixture to fix them in place, not only to fix the workpiece as a whole, but also to ensure its processing accuracy in order to meet its accuracy requirements and prevent malfunctions caused by slight deviations, which could ultimately threaten personal safety. Utility Model Content
[0003] Those skilled in the art have provided a high-precision clamping fixture for workpieces to solve the problems mentioned in the background art.
[0004] To solve the above technical problems, this utility model provides a high-precision clamping fixture for workpieces, including a fixture base, a limiting device fixedly installed on the upper end of the fixture base by bolts, the limiting device locking the U-shaped workpiece at the upper limit, two fixture brackets fixedly installed on the upper end of the fixture base by bolts, the two fixture brackets being arranged symmetrically from left to right, the fixture brackets limiting the U-shaped workpiece, and a laser rangefinder fixedly installed on the top of the two fixture brackets by bolts.
[0005] The fixture base includes a fixture base plate, a fixing slot, a frame fixing slot, a cylinder fixing slot, and a stop plate slot. The upper end face of the fixture base plate has frame fixing slots on both the left and right sides. The two frame fixing slots are symmetrically arranged, which facilitates the placement of the fixture frame and allows the fixture frame to be fixedly installed on the fixture base plate with fixing bolts. The upper end face of the fixture base plate has a stop plate slot on the rear side of the middle. The stop plate slot is used to place the stop plate, and the stop plate is fixedly connected to the fixture base plate with bolts. The upper end face of the fixture base plate has two cylinder fixing slots in the middle. The two cylinder fixing slots are symmetrically arranged and are located in front of the stop plate slot, so that the telescopic cylinder in the cylinder fixing slot corresponds to and cooperates with the stop plate.
[0006] The fixture frame includes a main frame, a secondary frame plate, bolt connection holes, a receiving slot, a clearance opening, a protrusion, an arc groove, a through hole, a pivot hole, a limiting slot, a fixing bolt opening, a threaded hole, a first threaded rod, a first pressure sensor, a sliding rod, a second pressure sensor, a female seat plate, a second threaded rod, a limiting block, and an opening. The upper front surface of the main frame has a through hole that extends from front to back, communicating with the receiving slot. The secondary frame plate also has an opening corresponding to the through hole, allowing the sliding rod to slide through the opening and correspond to the through hole. The upper front surface of the main frame has a circular... A limiting groove is provided, within which a freely rotatable limiting block is installed. A through-hole is formed on the secondary frame plate, corresponding to the limiting groove. The diameter of the through-hole is larger than the diameter of the second threaded rod. The second threaded rod is fixedly mounted on the front end of the limiting block, allowing it to rotate freely within the through-hole. A female seat plate is fitted onto the second threaded rod, engaging with it threadedly. A sliding rod is fixedly mounted on the rear end of the female seat plate, and a second pressure sensor is fixedly mounted on the rear end of the sliding rod. Two second pressure sensors mounted on the left and right fixture frames are used to detect… The limiting pressure of the same U-shaped workpiece is measured to prevent bias pressure during the limiting process and reduce deformation of the U-shaped workpiece due to overload of the limiting pressure. By manually rotating the second threaded rod, the limiting block rotates within the pivot hole. At this time, the female seat plate is constrained by the sliding rod within the opening and through hole, so that the second threaded rod can engage with the female seat plate. The female seat plate will then reciprocate along the radial direction of the second threaded rod. The female seat plate drives the sliding rod to pass through the opening and through hole, thereby limiting and fixing the U-shaped workpiece. The middle of the main frame has a left and right through-hole. The threaded hole has a first threaded rod engaged inside it. The first pressure sensor is fixedly installed at one end of the first threaded rod that extends into the receiving groove. The first threaded rod engages with the threaded hole on the main frame, and the first threaded rod can drive the first pressure sensor to extend into the receiving groove. The two first pressure sensors installed on the left and right fixture frames detect the limiting pressure on the same U-shaped workpiece, thereby preventing bias pressure during the limiting process and reducing the deformation of the U-shaped workpiece caused by overload of the limiting pressure. A fixing bolt is opened at the top of the main frame.
[0007] The limiting device includes a telescopic cylinder, a third pressure sensor, a limiting plate, and right-angle guides. The telescopic cylinder is fixedly installed in the cylinder fixing groove by bolts. The third pressure sensor is fixedly installed on the upper end of the telescopic cylinder. Several right-angle guides are fixedly installed on the bent bottom surface of the limiting plate.
[0008] In a preferred embodiment: a fixing slot is provided at the middle of both the left and right end faces of the fixture base plate. The fixture base plate will be locked onto the worktable by the fixing slot and the fixing bolt, which will facilitate subsequent precision machining by mechanical equipment.
[0009] In a preferred embodiment: a secondary frame plate is provided on the front side of the main frame base, and a plurality of bolt connection holes are provided on the secondary frame plate and the main frame base. The secondary frame plate and the main frame base are fixedly connected by bolts passing through the bolt connection holes.
[0010] In a preferred embodiment: the main frame seat has a receiving slot on the side near the limiting device. The receiving slot is used to place the U-shaped workpiece. Both the front end of the main frame seat near the limiting device and the side end of the secondary frame plate near the limiting device have clearance openings, so that the U-shaped workpiece can be pushed into the receiving slot from the clearance opening.
[0011] In a preferred embodiment: both the main frame base and the secondary frame plate are provided with protruding strips on the upper part of the end face near the limiting device. The protruding strips on the main frame base are integrally formed with the main frame base, and the protruding strips on the secondary frame plate are integrally formed with the secondary frame plate. This results in arc-shaped grooves being formed between the upper and lower sides of the protruding strips on the main frame base and the main frame base, and between the upper and lower sides of the protruding strips on the secondary frame plate and the main frame base. The arc-shaped grooves are lower than the height of the milling surface of the U-shaped workpiece, which facilitates the milling cutter to perform good cutting work and ensures that the milling cutter's work is not obstructed by the main frame base and the secondary frame plate.
[0012] In a preferred embodiment: the laser rangefinder includes a laser rangefinder body, a bolt fixing slot, and a laser head. The laser rangefinder body has a bolt fixing slot, and a corresponding bolt is provided in the bolt fixing slot. By having the bolt pass through the bolt fixing slot and correspond to the fixing bolt opening, the laser rangefinder body is fixed on the main frame. Two laser heads are fixedly installed on the end face of the laser rangefinder body near the limiting device. The laser heads monitor the distance of the U-shaped workpiece that is limited and fixed on the fixture frame, thereby determining whether the U-shaped workpiece is in the center position between the two fixture frames, thus ensuring the accuracy of the milling cutter cutting.
[0013] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:
[0014] 1. When this utility model is used, the first threaded rod is rotated to engage with the threaded hole on the main frame. The first threaded rod can drive the first pressure sensor to extend into the receiving slot to limit the U-shaped workpiece. In conjunction with the laser head, the distance of the U-shaped workpiece fixed on the fixture frame is monitored. The length of the two first threaded rods extending into the receiving slot is adjusted in real time, so that the U-shaped workpiece is in the center position between the two fixture frames, ensuring the synchronous and accurate processing of the left and right ends of the U-shaped workpiece at the same time.
[0015] 2. When using this utility model, two telescopic cylinders are used to press the U-shaped workpiece against the limit plate. At the same time, a third pressure sensor is used to detect the pressure applied by the telescopic cylinders to ensure constant pressure, thereby reducing subsequent processing errors caused by pressure deviation.
[0016] 3. When using this utility model, rotating the second threaded rod limits the rotation of the limiting block within the live hole. At this time, the female seat plate is constrained by the sliding rod within the opening and through hole, allowing the second threaded rod to engage with the female seat plate. Consequently, the female seat plate will reciprocate along the radial direction of the second threaded rod. The female seat plate then drives the sliding rod through the opening and through hole to limit and fix the U-shaped workpiece. Two second pressure sensors installed on the left and right fixture frames detect the limiting pressure on the same U-shaped workpiece, thereby preventing bias pressure during the limiting process and reducing the deformation of the U-shaped workpiece caused by overload of the limiting pressure. Attached Figure Description
[0017] Figure 1 This is a structural diagram provided in this application;
[0018] Figure 2 This is a structural schematic diagram of the fixture base provided in this application;
[0019] Figure 3 This is a structural schematic diagram of the jig holder provided in this application;
[0020] Figure 4 This is a schematic diagram of the structure of the first threaded rod provided in this application;
[0021] Figure 5 This is a schematic diagram of the structure of the laser rangefinder provided in this application;
[0022] In the diagram: 1. Fixture base; 2. Fixture frame; 3. Laser rangefinder; 4. Limiting device; 5. U-shaped workpiece;
[0023] 11. Fixture base plate; 12. Fixing slot; 13. Frame fixing slot; 14. Cylinder fixing slot; 15. Backing plate slot;
[0024] 21. Main frame base; 22. Secondary frame plate; 23. Bolt connection hole; 24. Accommodation slot; 25. Clearance opening; 26. Raised bar; 27. Arc groove; 28. Through hole; 29. Hole; 210. Limiting groove; 211. Fixing bolt opening; 212. Threaded hole; 213. First threaded rod; 214. First pressure sensor; 215. Sliding rod; 216. Second pressure sensor; 217. Female base plate; 218. Second threaded rod; 219. Limiting block;
[0025] 31. Laser rangefinder body; 32. Bolt fixing slot; 33. Laser head;
[0026] 41. Telescopic cylinder; 42. Third pressure sensor; 43. Limiting plate; 44. Right-angle guide support. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0028] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0030] Please see Figures 1 to 5 In this embodiment, a high-precision clamping fixture for workpieces is provided, including a fixture base 1. A limiting device 4 is bolted to the upper end of the fixture base 1. The limiting device 4 locks the U-shaped workpiece 5 at the upper limit. Two fixture brackets 2 are bolted to the upper end of the fixture base 1. The two fixture brackets 2 are arranged symmetrically from left to right. The fixture brackets 2 will limit the U-shaped workpiece 5. A laser rangefinder 3 is bolted to the top of the two fixture brackets 2.
[0031] The fixture base 1 includes a fixture base plate 11, a fixing slot 12, a frame fixing slot 13, a cylinder fixing slot 14, and a backing plate slot 15. Fixing slots 12 are provided at the center of both the left and right end faces of the fixture base plate 11. The fixture base plate 11 is locked to the worktable by fixing bolts through the fixing slots 12, facilitating subsequent precision machining by mechanical equipment. Frame fixing slots 13 are provided on both the left and right sides of the upper end face of the fixture base plate 11. The two frame fixing slots 13 are symmetrically arranged, thus facilitating the placement of the fixture frame 2 and enabling the fixture... The fixture base 2 is fixedly installed on the fixture base plate 11 with the fixing bolt. A backing groove 15 is opened on the rear side of the middle of the upper end face of the fixture base plate 11. The backing groove 15 is used to place the limiting backing plate 43. The limiting backing plate 43 is fixedly connected to the fixture base plate 11 with bolts. Two cylinder fixing grooves 14 are opened in the middle of the upper end face of the fixture base plate 11. The two cylinder fixing grooves 14 are symmetrically arranged and are located on the front side of the backing groove 15, so that the telescopic cylinder 41 in the cylinder fixing groove 14 corresponds to and cooperates with the limiting backing plate 43.
[0032] The fixture base 2 includes a main base 21, a secondary base plate 22, bolt connection holes 23, a receiving groove 24, a clearance opening 25, a protruding strip 26, an arc groove 27, a through hole 28, a movable hole 29, a limiting groove 210, a fixing bolt opening 211, a threaded hole 212, a first threaded rod 213, a first pressure sensor 214, a sliding rod 215, a second pressure sensor 216, a female base plate 217, a second threaded rod 218, a limiting block 219, and an opening 220. The secondary base plate 22 is provided on the front side of the main base 21. The secondary base plate 22 and the main base 21 have several bolt connection holes 23. Bolts pass through the bolt connection holes 23 to fix the secondary base plate 22 and the main base 21. The main base 21 has a receiving groove on the side near the limiting device 4. The accommodating slot 24 is used for placing the U-shaped workpiece 5. Both the front end of the main frame 21 near the limiting device 4 and the end face of the secondary frame 22 near the limiting device 4 have clearance openings 25, allowing the U-shaped workpiece 5 to be pushed into the accommodating slot 24 through the clearance openings 25. The upper part of the end face of both the main frame 21 and the secondary frame 22 near the limiting device 4 is provided with protrusions 26. The protrusions 26 on the main frame 21 and the secondary frame 22 are integrally formed, thus creating arc-shaped grooves 27 between the upper and lower sides of the protrusions 26 on the main frame 21 and between the protrusions 26 on the secondary frame 22 and the main frame 21. These arc-shaped grooves 27 will be lower than the U-shaped workpiece. The height of the milling surface of part 5 facilitates good cutting by the milling cutter, ensuring that the milling cutter's operation is not obstructed by the main support 21 and the secondary support plate 22. A through hole 28 is provided on the upper part of the front end face of the main support 21, communicating with the receiving slot 24. An opening 220 corresponding to the through hole 28 is provided on the secondary support plate 22, allowing the sliding rod 215 to slide through the opening 220 and correspond to the through hole 28. A circular limiting groove 210 is provided on the upper part of the front end face of the main support 21, containing a freely rotatable limiting block 219. A through hole 29 is provided on the secondary support plate 22, corresponding to the limiting groove 210. The diameter of the through hole 29 is larger than the diameter of the second threaded rod 218. The limiting block 219... A second threaded rod 218 is fixedly installed at the front end of the 9, allowing the second threaded rod 218 to rotate freely within the pivot hole 29 along with the limiting block 219. A female seat plate 217 is fitted onto the second threaded rod 218, and the female seat plate 217 is threadedly engaged with the second threaded rod 218. A slide rod 215 is fixedly installed at the rear end of the female seat plate 217, and a second pressure sensor 216 is fixedly installed at the rear end of the slide rod 215. The two second pressure sensors 216 installed on the left and right fixture holders 2 detect the limiting pressure on the same U-shaped workpiece 5, thereby preventing bias pressure during the limiting process and reducing deformation of the U-shaped workpiece 5 due to overload of the limiting pressure. By manually rotating the second threaded rod 218, the limiting block 219 is limited to rotating within the pivot hole 29.At this time, the female base plate 217 will be constrained by the slide rod 215 within the opening 220 and through hole 28, so that the second threaded rod 218 can engage with the female base plate 217. Thus, the female base plate 217 will reciprocate along the radial direction of the second threaded rod 218. The female base plate 217 will drive the slide rod 215 through the opening 220 and through hole 28 to limit and fix the U-shaped workpiece 5. The main frame 21 has a threaded hole 212 that extends through the left and right sides in the middle. The first threaded rod 213 is engaged in the threaded hole 212 and extends into the receiving groove. One end of fixture 24 is fixedly mounted with a first pressure sensor 214, which engages with a threaded hole 212 on the main frame 21 via a first threaded rod 213. The first threaded rod 213 can drive the first pressure sensor 214 into the receiving slot 24. Two first pressure sensors 214 mounted on the left and right fixture frames 2 detect the limiting pressure on the same U-shaped workpiece 5, thereby preventing bias pressure during the limiting process and reducing deformation of the U-shaped workpiece 5 due to overload of the limiting pressure. A fixing bolt port 211 is provided at the top of the main frame 21.
[0033] The laser rangefinder 3 includes a laser rangefinder body 31, a bolt fixing groove 32, and a laser head 33. The laser rangefinder body 31 has a bolt fixing groove 32, and a corresponding bolt is provided in the bolt fixing groove 32. The bolt passes through the bolt fixing groove 32 and corresponds to the fixing bolt opening 211, thereby fixing the laser rangefinder body 31 to the main frame 21. Two laser heads 33 are fixedly installed on the end face of the laser rangefinder body 31 near the limiting device 4. The laser heads 33 monitor the distance of the U-shaped workpiece 5 that is limited and fixed on the fixture frame 2, thereby determining whether the U-shaped workpiece 5 is in the center position between the two fixture frames 2, thereby ensuring the accuracy of the milling cutter.
[0034] The limiting device 4 includes a telescopic cylinder 41, a third pressure sensor 42, a limiting plate 43, and a right-angle guide 44. The telescopic cylinder 41 is fixedly installed in the cylinder fixing groove 14 by bolts. The third pressure sensor 42 is fixedly installed on the upper end of the telescopic cylinder 41. The third pressure sensor 42 installed on both telescopic cylinders 41 is used to detect the pressure applied by the telescopic cylinder 41 to press the U-shaped workpiece 5 against the limiting plate 43, so as to ensure constant pressure and reduce the pressure deviation. The subsequent processing errors are caused by the right-angled corner of the limiting plate 43, which is fixedly installed in the plate groove 15 by bolts. Several right-angled guides 44 are fixedly installed on the bottom surface of the corner of the limiting plate 43. The right-angled guides 44 will provide limiting guidance for the U-shaped workpiece 5 and serve as temporary brackets for placing the U-shaped workpiece 5. The right-angled guides 44 and the telescopic cylinder 41 are staggered to avoid interference from the telescopic cylinder 41 during the pressure application process of the U-shaped workpiece 5.
[0035] The working principle of this utility model is as follows:
[0036] In use, this utility model involves placing the U-shaped workpiece 5 from the clearance opening 25 into the receiving slot 24. The U-shaped workpiece 5 is guided by the front arc-shaped guide bracket 44 and temporarily placed on it. Then, the first threaded rod 213 is manually rotated to engage with the threaded hole 212 on the main frame 21. The first threaded rod 213 drives the first pressure sensor 214 to extend into the receiving slot 24 to limit the U-shaped workpiece 5. The laser head 33 monitors the distance to the U-shaped workpiece 5, which is fixed to the fixture frame 2, and adjusts the length of the two first threaded rods 213 extending into the receiving slot 24 in real time. This ensures that the U-shaped workpiece 5 is centered between the two fixture frames 2, guaranteeing simultaneous and precise processing of both ends of the U-shaped workpiece 5. Next, two telescopic cylinders 41 press the U-shaped workpiece 5 against the limiting plate 43, while simultaneously using a third... Pressure sensor 42 detects the pressure applied by telescopic cylinder 41 to ensure constant pressure, thereby reducing subsequent processing errors caused by pressure deviation. Finally, the second threaded rod 218 is manually rotated. Since the limiting block 219 is limited to rotating within the live hole 29, the female seat plate 217 is constrained by the sliding rod 215 within the opening 220 and through hole 28, so that the second threaded rod 218 can engage with the female seat plate 217. Thus, the female seat plate 217 will reciprocate along the radial direction of the second threaded rod 218. The female seat plate 217 drives the sliding rod 215 to pass through the opening 220 and through hole 28 to limit and fix the U-shaped workpiece 5. The two second pressure sensors 216 set on the left and right fixture brackets 2 detect the limiting pressure on the same U-shaped workpiece 5, thereby preventing bias pressure during the limiting process and reducing the deformation of the U-shaped workpiece 5 due to overload of the limiting pressure.
[0037] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.
Claims
1. A high-precision clamping fixture for workpieces, comprising a fixture base (1), characterized in that, The upper end of the fixture base (1) is bolted to install a limiting device (4), which limits and locks the U-shaped workpiece (5). The upper end of the fixture base (1) is bolted to install two fixture brackets (2), which are arranged symmetrically on the left and right. The fixture brackets (2) will limit the U-shaped workpiece (5). The top of the two fixture brackets (2) is bolted to install a laser rangefinder (3). The fixture base (1) includes a fixture base plate (11), a fixing slot (12), a frame fixing slot (13), a cylinder fixing slot (14), and a backing slot (15). The upper end face of the fixture base plate (11) is provided with frame fixing slots (13) on both the left and right sides. The two frame fixing slots (13) are symmetrically arranged. The backing slot (15) is provided on the rear side of the middle part of the upper end face of the fixture base plate (11). The upper end face of the fixture base plate (11) is provided with two cylinder fixing slots (14). The two cylinder fixing slots (14) are symmetrically arranged and are located on the front side of the backing slot (15). The fixture frame (2) includes a main frame (21), a secondary frame plate (22), bolt connection holes (23), a receiving slot (24), a clearance opening (25), a protruding strip (26), an arc groove (27), a through hole (28), a movable hole (29), a limiting groove (210), a fixing bolt opening (211), a threaded hole (212), a first threaded rod (213), a first pressure sensor (214), a sliding rod (215), a second pressure sensor (216), a female seat plate (217), a second threaded rod (218), a limiting block (219), and an opening (220). The front end face of the main frame (21) has a through hole (28) that extends from front to back, which communicates with the receiving slot (24). The secondary frame plate (22) has an opening (220) corresponding to the through hole (28), allowing the slide rod (215) to slide through the opening (220) and correspond to the through hole (28). The front end face of the main frame (21) has a circular limiting groove (210), and a freely rotatable limiting block (219) is provided in the limiting groove (210). The secondary frame plate (22) has a through hole (29) that extends from front to back. Corresponding to the limiting groove (210), the diameter of the live hole (29) is larger than the diameter of the second threaded rod (218). The front end of the limiting block (219) is fixedly installed with the second threaded rod (218), so that the second threaded rod (218) can rotate freely in the live hole (29) along with the limiting block (219). A female seat plate (217) is sleeved on the second threaded rod (218), and the female seat plate (217) is threadedly engaged with the second threaded rod (218). A slide rod (215) is fixedly installed at the rear end of the female seat plate (217), and a second pressure sensor (215) is fixedly installed at the rear end of the slide rod (215). 16) A threaded hole (212) is provided in the middle of the main frame (21) and extends through it. A first threaded rod (213) is engaged in the threaded hole (212). A first pressure sensor (214) is fixedly installed at one end of the first threaded rod (213) that extends into the receiving slot (24). The first threaded rod (213) engages with the threaded hole (212) on the main frame (21), and the first threaded rod (213) can drive the first pressure sensor (214) to extend into the receiving slot (24). A fixing bolt (211) is provided at the top of the main frame (21). The limiting device (4) includes a telescopic cylinder (41), a third pressure sensor (42), a limiting plate (43), and right-angle guides (44). The telescopic cylinder (41) is fixedly installed in the cylinder fixing groove (14) by bolts. The third pressure sensor (42) is fixedly installed on the upper end of the telescopic cylinder (41). Several right-angle guides (44) are fixedly installed on the folded bottom surface of the limiting plate (43).
2. The high-precision clamping fixture for workpieces according to claim 1, characterized in that, Fixture base plate (11) has a fixing slot (12) in the middle of both the left and right end faces. Fixture base plate (11) will be locked to the worktable by fixing bolts through the fixing slot (12).
3. The high-precision clamping fixture for workpieces according to claim 1, characterized in that, A secondary frame plate (22) is provided on the front side of the main frame base (21). Several bolt connection holes (23) are provided on the secondary frame plate (22) and the main frame base (21). Bolts pass through the bolt connection holes (23) to fix the secondary frame plate (22) and the main frame base (21) in place.
4. A high-precision clamping fixture for a workpiece according to claim 3, characterized in that, The main frame (21) has a receiving slot (24) on the side of the limiting device (4). The receiving slot (24) is used to place the U-shaped workpiece (5). The front end of the main frame (21) near the limiting device (4) and the side end of the secondary frame (22) near the limiting device (4) are both provided with clearance openings (25).
5. A high-precision clamping fixture for a workpiece according to claim 4, characterized in that, The upper part of the end face of the main frame (21) and the secondary frame (22) near the limiting device (4) is provided with a protrusion (26). The protrusion (26) on the main frame (21) is integrally formed with the main frame (21), and the protrusion (26) on the secondary frame (22) is integrally formed with the secondary frame (22). The upper and lower sides of the protrusion (26) on the main frame (21) and the upper and lower sides of the protrusion (26) on the secondary frame (22) and the main frame (21) form arc grooves (27). The arc grooves (27) are lower than the height of the milling surface of the U-shaped workpiece (5).
6. A high-precision clamping fixture for workpieces according to claim 1, characterized in that, The laser rangefinder (3) includes a laser rangefinder body (31), a bolt fixing groove (32) and a laser head (33). The laser rangefinder body (31) has a bolt fixing groove (32) and a corresponding bolt is provided in the bolt fixing groove (32). Two laser heads (33) are fixedly installed on the end face of the laser rangefinder body (31) near the limiting device (4).