A precision positioning fixture for precision part machining

Abstract

The utility model relates to positioning fixture field, and disclose a precision positioning fixture for precision part processing, mainly by base, sliding bar no.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixtures, specifically a precision positioning fixture for machining precision parts. Background Technology

[0002] Therefore, we propose a precision positioning fixture for machining precision parts. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a precision positioning fixture for machining precision parts, thus solving the aforementioned problems.

[0004] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a precision positioning fixture for machining precision parts, comprising a base, a first sliding bar, a machining table, and a second sliding bar. The base is symmetrically fixedly installed on both sides of the machining table, and the second sliding bar is fixedly installed on the upper surface of the base. Hinges are symmetrically fixedly installed on the upper surface of the base corresponding to both sides of the second sliding bar. The first sliding bar is fixedly installed on the upper surface of the base corresponding to the front of the second sliding bar, and the first sliding bar and the second sliding bar are perpendicularly corresponding. The side walls of the base and the side walls of the machining table are tightly fitted together. A connecting plate is fixedly installed on the upper surface of the base between the first sliding bar and the second sliding bar; An extension plate is fixedly installed on the side wall of the base away from the processing table, and a support plate is fixedly installed on the extension plate. The support plate has threaded holes. The base has symmetrical guide grooves on both sides of the sliding bar two, and the guide grooves are parallel to the sliding bar two. The base is provided with a clamping mechanism, and the extension plate on the base is provided with an anti-reverse mechanism, and one end of the anti-reverse mechanism and the clamping mechanism are fixedly connected.

[0005] Preferably, the clamping mechanism includes a sliding seat, a spring, and a guide rod. The bottom surface of the sliding seat has a sliding groove, and a support plate is fixedly installed on the upper surface of the sliding seat near one side. The support plate has a sliding hole. The guide rod is fixedly installed on the connecting plate on the base. The spring is fixedly connected to the connecting plate of the base corresponding to the periphery of the guide rod. The other end of the spring is fixedly connected to the support plate on the sliding seat, and the guide rod and the sliding hole on the sliding seat are coaxially slidably connected. The sliding groove at the bottom of the sliding seat and the sliding bar are engaged and slidably connected.

[0006] Preferably, the clamping mechanism further includes a bending connecting rod and a clamping block. A hinge shaft one is symmetrically fixedly installed on the upper surface of the sliding seat corresponding to both sides of the guide rod. A sliding groove is opened on the bottom surface of the clamping block. A hinge shaft two is fixedly installed on the upper surface of the clamping block. The bending connecting rod is approximately "L" shaped. Two clamping blocks are symmetrically slidably connected to the sliding bar; A slider is slidably connected within a guide groove on the base, and a hinge shaft is mounted on the plane of the slider. One end of the bending link is hinged to a hinge shaft on the sliding seat, the other end of the bending link is hinged to a hinge shaft on the clamping block, and the middle bend of the bending link is hinged to a hinge shaft on the slider.

[0007] Preferably, rubber pads are fixedly installed on the opposing surfaces of the clamping blocks on both sides.

[0008] Preferably, the anti-reverse mechanism includes a lead screw, a second chuck, a push rod, and a second spring. The lead screw is fixedly installed on the outer wall of the sliding seat, and the lead screw is threadedly connected to the threaded hole on the base. A limit plate is fixedly installed on the end face of the lead screw on the other side of the support plate on the base. A push rod is fixedly installed on the plane of the limit plate. A second spring is fixedly installed on the outer periphery of the push rod corresponding to the plane of the limit plate. The second chuck is slidably connected to the push rod. The other end of the second spring is fixedly connected to the plane of the second chuck. The chuck two has densely packed teeth on its arc-shaped surface opposite to the push rod.

[0009] Preferably, the anti-reverse mechanism further includes a rotating block and a chuck one, the push rod is coaxially fixedly mounted on the other end of the chuck two, and the rotating block is fixedly connected to the plane of the chuck one; The teeth on chuck one correspond to the teeth on chuck two.

[0010] Preferably, multiple rubber blocks are fixedly installed in a matrix on the upper surface of the processing table; The processing table has multiple honeycomb holes inside.

[0011] Compared with the prior art, this utility model provides a precision positioning fixture for machining precision parts, which has the following advantages: 1. This precision positioning fixture for machining precision parts, by setting symmetrically arranged sliding bars one and two, and cooperating with the clamping mechanism that links the sliding seat and the bending connecting rod, can achieve bidirectional synchronous clamping, which improves the positioning accuracy and stability of precision parts. It is especially suitable for machining irregular or easily deformable workpieces, and effectively avoids the offset or vibration problems caused by unilateral force application of traditional fixtures.

[0012] 2. The precision positioning fixture used for machining precision parts adopts a screw and double chuck structure for the anti-reverse mechanism. The spring-loaded push rod keeps chuck one and chuck two in a meshed state at all times, effectively preventing the screw from rotating due to vibration or external force during machining. This ensures that the clamping force is durable and reliable, and improves the safety and consistency of the fixture in long-term continuous operation.

[0013] 3. The precision positioning fixture for machining precision parts has a machining table surface with a matrix of rubber blocks and a honeycomb structure inside. This not only enhances the anti-slip and cushioning effect between the workpiece and the table, but also reduces the overall weight and improves the structural rigidity. It takes into account the requirements of vibration reduction, impact resistance and lightweighting, and is superior to the applicability of traditional metal tables in precision machining. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the processing table of this utility model; Figure 3 for Figure 1 A magnified view of part A in the diagram.

[0015] In the diagram: 1. Base; 2. Lead screw; 3. Sliding seat; 4. Spring 1; 5. Guide rod; 6. Bending connecting rod; 7. Sliding bar 1; 8. Clamping block; 9. Rubber pad; 10. Processing table; 11. Rubber block; 12. Sliding bar 2; 13. Rotating block; 14. Chuck 1; 15. Chuck 2; 16. Push rod; 17. Spring 2; 18. Honeycomb hole; 19. Slider. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3 A precision positioning fixture for machining precision parts includes a base 1, a sliding bar 7, a machining table 10, and a sliding bar 2 12. The base 1 is symmetrically fixedly installed on both sides of the machining table 10. The sliding bar 2 12 is fixedly installed on the upper surface of the base 1. Hinges are symmetrically fixedly installed on both sides of the upper surface of the base 1 corresponding to the sliding bar 2 12. The sliding bar 7 is fixedly installed on the upper surface of the base 1 corresponding to the front of the sliding bar 2 12. The sliding bar 7 and the sliding bar 2 12 are perpendicularly corresponding. The side walls of the base 1 and the side walls of the machining table 10 are tightly fitted together. A connecting plate is fixedly installed on the upper surface of the base 1 between the sliding bar 7 and the sliding bar 12; An extension plate is fixedly installed on the side wall of the base 1 away from the processing table 10, and a support plate is fixedly installed on the extension plate. The support plate has threaded holes. Guide grooves are symmetrically provided on both sides of the sliding bar 12 on the plane of the base 1, and the guide grooves are parallel to the sliding bar 12; A clamping mechanism is provided on the base 1, and an anti-reverse mechanism is provided on the extension plate on the base 1. The anti-reverse mechanism and one end of the clamping mechanism are fixedly connected.

[0018] Furthermore, the clamping mechanism includes a sliding seat 3, a spring 4, and a guide rod 5. The bottom surface of the sliding seat 3 has a sliding groove, and a support plate is fixedly installed on the upper surface of the sliding seat 3 near one side. The support plate has a sliding hole. The guide rod 5 is fixedly installed on the connecting plate on the base 1. The spring 4 is fixedly connected to the connecting plate of the base 1 corresponding to the periphery of the guide rod 5. The other end of the spring 4 is fixedly connected to the support plate on the sliding seat 3, and the guide rod 5 and the sliding hole on the sliding seat 3 are coaxially slidably connected. In addition to limiting the trajectory when the sliding seat 3 moves, the guide rod 5 can also provide stable installation support for the spring 4, preventing the spring 4 from shifting laterally or twisting during compression or tension, ensuring that the spring 4 is always subjected to force along the axial direction, thereby ensuring that its restoring force on the sliding seat 3 is uniform and stable. The sliding groove at the bottom of the sliding seat 3 and the sliding bar 2 12 are engaged and slidably connected.

[0019] Furthermore, the clamping mechanism also includes a bending connecting rod 6 and a clamping block 8. A hinge shaft 1 is symmetrically fixedly installed on the upper surface of the sliding seat 3 corresponding to both sides of the guide rod 5. A sliding groove is opened on the bottom surface of the clamping block 8. A hinge shaft 2 is fixedly installed on the upper surface of the clamping block 8. The bending connecting rod 6 is roughly "L" shaped. Two clamping blocks 8 are symmetrically connected to the slider 7; A slider 19 is slidably connected in the guide groove on the base 1, and a hinge shaft is installed on the plane of the slider 19; One end of the bending link 6 is hinged to the hinge shaft on the sliding seat 3, the other end of the bending link 6 is hinged to the hinge shaft on the clamping block 8, and the middle bend of the bending link 6 is hinged to the hinge shaft on the slider 19.

[0020] Furthermore, rubber pads 9 are fixedly installed on the opposing surfaces of the two clamping blocks 8. For irregularly shaped parts with small protrusions or depressions on the surface, the rubber pads 9 can conform to the surface of the parts through their own deformation, so that the clamping force is more evenly distributed on the contact surface of the parts, avoiding the problem of local stress concentration caused by traditional rigid clamping.

[0021] The anti-reverse mechanism includes a lead screw 2, a second chuck 15, a push rod 16, and a second spring 17. The lead screw 2 is fixedly installed on the outer wall of the sliding seat 3. The lead screw 2 is threadedly connected to the threaded hole on the base 1. A limit plate is fixedly installed on the end face of the lead screw 2 on the other side of the support plate on the base 1. The push rod 16 is fixedly installed on the plane of the limit plate. The second spring 17 is fixedly installed on the outer periphery of the push rod 16 corresponding to the plane of the limit plate. The second chuck 15 is slidably connected to the push rod 16. The other end of the second spring 17 is fixedly connected to the plane of the second chuck 15. The chuck 15 has densely packed teeth on the arc surface on the side opposite to the push rod 16. The densely packed teeth design on the chuck 14 and chuck 15 can increase the meshing contact area of ​​the two and improve the load-bearing capacity when locking. Even when facing large machining vibrations or external impacts, the multiple sets of teeth can work together to resist the reverse tendency of the lead screw 2 and ensure that the clamping force does not decrease.

[0022] Furthermore, the anti-reverse mechanism also includes a rotating block 13 and a chuck 14. The push rod 16 is located on the other end of the chuck 15 and the chuck 14 is coaxially fixedly mounted. The rotating block 13 is fixedly connected to the plane of the chuck 14. The teeth on chuck 14 correspond to the teeth on chuck 25.

[0023] Furthermore, multiple rubber blocks 11 are fixedly installed in a matrix on the upper surface of the processing table 10; The interior of the processing table 10 has multiple honeycomb holes 18.

[0024] Structural Description: Base 1: Base 1 is the basic load-bearing component of the fixture. It is symmetrically fixed on both sides of the processing table 10 and attached to the side wall. The upper surface has a sliding bar 2 12, with hinge shafts on both sides and a vertical sliding bar 1 7 in front. It also has a connecting plate, an extension plate with a threaded hole support plate, and a guide groove for parallel sliding bar 2 12 to provide installation and guidance for other components. Lead screw 2: Lead screw 2 is a power transmission and clamp drive component. It has a cylindrical thread structure. One end is fixed to the outer wall of the sliding seat 3, and the other end passes through the threaded hole of the support plate of the base 1 and is equipped with a limiting plate. By cooperating with the threaded hole, when rotated, it can drive the sliding seat 3 to move along the sliding bar 12, thereby driving the clamp mechanism to clamp or release the parts. At the same time, it provides a mounting carrier for the anti-reverse mechanism and is a key transmission component connecting the operating end and the clamp execution end. Sliding seat 3: The sliding seat 3 is the core component of the clamping mechanism. It has a sliding groove on the bottom surface and a support plate and hinge shaft 1 on the upper surface. The sliding groove and sliding bar 2 12 are engaged and slid. The support plate is connected to the base 1 connecting plate through spring 1 4 and guide rod 5. The side wall is connected to screw rod 2, which can move along sliding bar 2 12 under the drive of screw rod 2. The bending connecting rod 6 is driven by hinge shaft 1 to realize the synchronous opening and closing of clamping block 8. Spring 4: Spring 4 is a clamp reset and auxiliary buffer component. It is a cylindrical helical spring structure, which is sleeved on the outside of the guide rod 5. One end is connected to the base 1 connecting plate, and the other end is connected to the sliding seat 3 support plate. Under normal conditions, it is in a pre-tightened state. When the lead screw 2 drives the sliding seat 3 to move and clamp the part, spring 4 is compressed and stores the elastic force. When the part is released, the elastic force pushes the sliding seat 3 to reset. At the same time, it can buffer the influence of machining vibration on the sliding seat 3 and ensure clamping stability. Guide rod 5: Guide rod 5 is the motion guide component of sliding seat 3. It is a cylindrical structure, fixed on the connecting plate of base 1, and slidably connected to the sliding hole of the support plate of sliding seat 3. It is fitted with spring 4, which can limit the movement trajectory of sliding seat 3, ensure that it moves smoothly only along the direction of sliding bar 12, avoid the sliding seat 3 from shifting and causing the clamping block 8 to misalign, ensure the accuracy of bidirectional synchronous clamping of the clamping mechanism, and improve the positioning reliability. Bending Link 6: Bending Link 6 is L-shaped and is the key to the clamp transmission. One end is hinged to the hinge shaft of the sliding seat 3, the other end is hinged to the hinge shaft of the clamping block 8, and the middle bend is hinged to the hinge shaft of the slider 19. It can convert the movement of the sliding seat 3 into the synchronous opening and closing action of the clamping block 8. Sliding bar 1 7: Sliding bar 1 7 is a motion guide component for clamping block 8. It is a long strip-shaped protrusion structure, fixed on the upper surface of base 1 and perpendicular to sliding bar 2 12. It engages and slides with the sliding grooves on the bottom surface of the two clamping blocks 8, restricting the movement direction of the clamping blocks 8 and ensuring that they only move in the direction perpendicular to the movement of sliding seat 3. This ensures that the clamping blocks 8 on both sides move synchronously and smoothly closer to or further away from the parts, improving positioning accuracy. Clamping block 8: The bottom surface of clamping block 8 has a sliding groove, which is slidably connected to sliding strip 7. The upper surface has a hinge shaft 2. Rubber pads 9 are installed on the opposite sides of the clamping blocks 8. They can slide along sliding strip 7 under the drive of bending connecting rod 6 to achieve bidirectional synchronous clamping. The rubber pads 9 can prevent parts from shifting and being damaged.

[0025] Rubber pad 9: Rubber pad 9 is a clamping protection and anti-slip component. It is a sheet-like elastic rubber structure, fixed on the opposite surfaces of the clamping blocks 8 on both sides, and in direct contact with the part. It can increase the friction between the clamping blocks 8 and the part, and prevent the part from shifting due to processing vibration. At the same time, it uses the elastic properties of rubber to buffer the impact of clamping force on the part, and avoid scratches or extrusion deformation on the surface of the part. It is especially suitable for the processing of precision and fragile parts. Machining table 10: Machining table 10 is the core platform for placing parts. It has a flat structure and is tightly fitted to the base 1 on both sides. Rubber blocks 11 are installed on the upper surface and honeycomb holes 18 are opened inside to support the parts to be processed. The rubber blocks 11 enhance the anti-slip and cushioning effect of the parts. The honeycomb holes 18 reduce the weight of the platform while increasing the structural rigidity and absorbing processing vibration, providing a stable processing environment for the parts and ensuring processing accuracy. Rubber block 11: Rubber block 11 is a table surface anti-slip and vibration damping component. It is a block-shaped elastic rubber structure that is fixed in a matrix on the upper surface of the processing table 10 and in contact with the bottom surface of the part. It can increase the friction between the part and the processing table 10 and prevent the part from having a small displacement during processing. At the same time, it uses the vibration damping properties of rubber to absorb some of the processing vibration, reduce the impact of vibration on the positioning of the part, and improve the processing stability. Sliding bar 2 12: Sliding bar 2 12 is the motion guide component of sliding seat 3. It is a long strip-shaped protrusion structure, fixed on the upper surface of base 1, and engages with the sliding groove on the bottom surface of sliding seat 3 to restrict the movement trajectory of sliding seat 3, ensuring that it moves smoothly only in a direction parallel to the side wall of processing table 10, avoiding the sliding seat 3 from shifting and causing the bending connecting rod 6 to be misaligned, thus ensuring the clamping accuracy and stability of the fixture mechanism; Rotating block 13: Rotating block 13 is the operating component of the anti-reverse mechanism. It is a block structure and is fixed on the plane of chuck 14. It is easy for the operator to manually hold and rotate it, which drives chuck 14, push rod 16 and lead screw 2 to rotate synchronously, thereby driving sliding seat 3 to move to clamp the part. At the same time, the clamping force can be precisely adjusted by controlling the rotation direction and force to adapt to the machining of parts with different precision requirements. Chuck 14: Chuck 14 is the locking component of the anti-reverse mechanism. It has a disc-shaped structure and is coaxially fixed to the end of push rod 16 away from lead screw 2. The arc surface has densely packed teeth that correspond to the teeth of chuck 2 15. It rotates synchronously with rotating block 13 and push rod 16. When clamping parts, it engages with chuck 2 15 to form a one-way lock, preventing lead screw 2 from rotating due to vibration. When releasing parts, it can rotate in the opposite direction with rotating block 13 to release the lock.

[0026] Chuck 2 15: Chuck 2 15 is a locking component of the anti-reverse mechanism. It has a disc-shaped structure and slides on the push rod 16. The arc surface has densely packed teeth that correspond to chuck 1 14. The plane is connected to spring 2 17. Under the preload of spring 2 17, it is always engaged with chuck 1 14. It only allows chuck 1 14 to drive the lead screw 2 to rotate in the forward direction to clamp the parts, preventing it from rotating in the reverse direction and causing loosening. This ensures that the clamping force is durable and reliable, and improves the safety of operation. Push rod 16: Push rod 16 is the connecting and transmission component of the anti-reverse mechanism. It has a cylindrical structure. One end is connected to the limiting plate of lead screw 2, and the other end passes through chuck 2 15 and chuck 14 in sequence and is fixed to chuck 14. It is connected to rotating block 13 and can transmit the rotational force of rotating block 13 to lead screw 2 to drive the clamping mechanism to operate. At the same time, it provides a mounting and sliding carrier for chuck 14 and chuck 2 15 to ensure the stability of the double chuck engagement and locking. It is the connecting link between the anti-reverse mechanism and the clamping mechanism. Spring 2 17: Spring 2 17 is the pre-tensioning component of chuck 2 15. It is a cylindrical helical spring structure, which is sleeved on the outside of push rod 16. One end is connected to the limiting plate of screw rod 2, and the other end is connected to the plane of chuck 2 15. Under normal conditions, it is in a pre-tensioned state, continuously applying a pushing force to chuck 2 15 to keep it tightly engaged with chuck 1 14, ensuring the anti-reverse locking effect. When it is necessary to loosen the parts, manually push chuck 2 15 to compress spring 2 17, which will release the engagement with chuck 1 14 and facilitate the reverse rotation of screw rod 2. Honeycomb Hole 18: The honeycomb hole 18 is a structural optimization component of the machining table 10. It is a regular hexagonal through hole that is opened inside the machining table 10. Without reducing the structural rigidity of the machining table 10, it significantly reduces the overall weight of the platform and achieves lightweight design. At the same time, the honeycomb structure can effectively disperse and absorb the vibration generated during the processing, reduce the vibration transmitted to the parts, ensure the machining accuracy of the parts, and improve the vibration reduction and impact resistance of the machining table 10.

[0027] Slider 19: Slider 19 is slidably connected in the guide groove of the base 1. A hinge shaft is mounted on the plane. It is connected to the middle bend of the bending link 6 through the hinge shaft. It slides along the guide groove as the bending link 6 moves, providing support and guidance for the bending link 6 and ensuring the stable movement of the clamping block 8.

[0028] Working principle: First, the precision part to be processed is placed on the processing table 10. The rubber blocks 11 arranged in a matrix on the upper surface of the processing table 10 will directly contact the bottom surface of the part. The elastic properties of the rubber increase the friction between the part and the processing table 10, which initially prevents the part from having a small displacement. At the same time, the honeycomb holes 18 opened inside the processing table 10 can prepare for vibration reduction in advance, providing a stable foundation for subsequent processing.

[0029] Next, the operator manually holds the rotating block 13 and rotates it clockwise. The rotating block 13 will drive the chuck 14, which is fixed to it, to rotate synchronously. Since the chuck 14 and the push rod 16 are coaxially fixed, the push rod 16 will rotate together with the chuck 14. One end of the push rod 16 is fixed to the lead screw 2 through a limiting plate, so that the lead screw 2 also rotates. The lead screw 2 is threadedly connected to the threaded hole of the support plate on the extension plate of the base 1. Under the action of the threaded engagement, when the lead screw 2 rotates, it will move towards the side closer to the processing table 10 along the axis of the threaded hole, thereby pushing the support plate 14 to rotate. When the fixed sliding seat 3 moves, the sliding groove on the bottom surface of the sliding seat 3 engages with the sliding bar 12 on the base 1 and slides. At the same time, the sliding hole of the support plate on the sliding seat 3 slides coaxially with the guide rod 5 on the connecting plate of the base 1. The guide rod 5 restricts the movement trajectory of the sliding seat 3, ensuring that it moves smoothly only along the direction of the sliding bar 12 and preventing the sliding seat 3 from deviating. During the movement of the sliding seat 3, it will stretch the spring 4 that is sleeved around the guide rod 5. After the spring 4 is stretched, it stores elastic potential energy, which prepares for the reset when the parts are released later.

[0030] The hinge shafts symmetrically mounted on both sides of the upper surface of the sliding seat 3 move with the sliding seat 3, thereby driving one end of the bent connecting rod 6 hinged to it to move. The bent connecting rod 6 is roughly "L" shaped, with its middle bend hinged to the hinge shaft on the slider 19. The slider 19 is slidably connected in the guide groove of the base 1. When one end of the bent connecting rod 6 is pushed, it will rotate around the hinge shaft of the slider 19 as the fulcrum, and at the same time push the slider 19 to slide along the guide groove of the base 1. The sliding of the slider 19 provides stable support and movement space for the bent connecting rod 6, ensuring the stability of the bent connecting rod 6 during the transmission process.

[0031] The other end of the bending link 6 is hinged to the hinge shaft on the clamping block 8. The rotation of the bending link 6 will cause the clamping block 8 to slide along the sliding bar 7 on the base 1. Since the bending link 6 and the clamping block 8 on both sides of the sliding seat 3 are symmetrically arranged, the clamping blocks 8 on both sides will move synchronously towards the part, realizing bidirectional synchronous clamping. The rubber pad 9 fixed on the opposite surface of the clamping block 8 will contact the surface of the part. The rubber pad 9 can not only increase the friction with the part and prevent the part from shifting during processing, but also buffer the impact of the clamping force on the part through its own elasticity, avoiding damage to the surface of the part. Since chuck 2 15 is slidably sleeved on push rod 16, and one end of spring 2 17 on the periphery of push rod 16 is fixed to the limiting plate of lead screw 2 and the other end is fixed to the plane of chuck 2 15, spring 2 17 is normally in a pre-tightened state, and will continuously apply a pushing force towards chuck 14 to chuck 2 15, so that the teeth on the arc surface of chuck 2 15 and the teeth on chuck 14 are always in a meshing state. When chuck 14 rotates forward with rotating block 13, the teeth on chuck 14 will push the teeth on chuck 2 15, overcoming part of the elastic force of spring 2 17, so that chuck 2 15... Slightly slide along push rod 16 to ensure that chuck 14 can rotate smoothly to clamp the part; when the lead screw 2 tends to reverse due to vibration or external force during the machining process, chuck 14 tends to rotate in the opposite direction. At this time, the teeth of chuck 14 and chuck 2 15 will mesh and lock together. The preload of spring 2 17 will further ensure that the teeth fit tightly and prevent chuck 14 from rotating in the opposite direction, thereby preventing the lead screw 2 from rotating and causing the clamping force to decrease. This ensures that the clamping force of the fixture is durable and reliable during long-term continuous operation, and improves the safety of operation and the consistency of machining.

[0032] After the part is machined, the operator pushes the chuck 15 towards the lead screw 2, compressing the spring 17 to disengage the chuck 15 from the teeth of the chuck 14. Then, the rotating block 13 is rotated in the opposite direction, causing the chuck 14, push rod 16, and lead screw 2 to rotate in the opposite direction. The lead screw 2 moves away from the machining table 10 under the action of the thread, pulling the sliding seat 3 to slide in the opposite direction along the sliding bar 12. At this time, the stretched spring 4 releases its elastic potential energy, assisting in pushing the sliding seat 3 back to its original position. During the resetting process of the sliding seat 3, the bending connecting rod 6 rotates in the opposite direction around the hinge shaft on the base 1, thereby pulling the two clamping blocks 8 to slide in opposite directions along the sliding bar 7, separating the rubber pad 9 from the part and releasing the clamp on the part. The operator can then remove the machined part, completing a full precision part positioning machining operation.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision positioning fixture for machining precision parts, characterized in that, include: The base (1), sliding bar one (7), processing table (10) and sliding bar two (12) are symmetrically fixed on both sides of the processing table (10). Sliding bar two (12) is fixedly fixed on the upper surface of the base (1). Hinges are symmetrically fixed on both sides of the upper surface of the base (1) corresponding to the two sides of the sliding bar two (12). Sliding bar one (7) is fixedly fixed on the upper surface of the base (1) corresponding to the front of the sliding bar two (12). Sliding bar one (7) and sliding bar two (12) are perpendicularly corresponding. The side walls of the base (1) and the side walls of the processing table (10) are tightly fitted together. A connecting plate is fixedly installed on the upper surface of the base (1) between the first sliding bar (7) and the second sliding bar (12); An extension plate is fixedly installed on the side wall of the base (1) away from the processing table (10), and a support plate is fixedly installed on the extension plate. The support plate has threaded holes. The base (1) has guide grooves symmetrically provided on both sides of the sliding bar (12) on its plane, and the guide grooves are parallel to the sliding bar (12). A clamping mechanism is provided on the base (1), and an anti-reverse mechanism is provided on the extension plate on the base (1), and one end of the anti-reverse mechanism and the clamping mechanism are fixedly connected.

2. The precision positioning fixture for machining precision parts according to claim 1, characterized in that, The clamping mechanism includes a sliding seat (3), a spring (4) and a guide rod (5). The bottom surface of the sliding seat (3) is provided with a sliding groove. A support plate is fixedly installed on the upper surface of the sliding seat (3) near one side. A sliding hole is provided on the support plate. A guide rod (5) is fixedly installed on the connecting plate on the base (1). A spring (4) is fixedly connected to the connecting plate of the base (1) corresponding to the periphery of the guide rod (5). The other end of the spring (4) is fixedly connected to the support plate on the sliding seat (3). The guide rod (5) and the sliding hole on the sliding seat (3) are coaxially slidably connected. The sliding groove at the bottom of the sliding seat (3) and the sliding bar (12) are engaged and slidably connected.

3. A precision positioning fixture for machining precision parts according to claim 2, characterized in that, The clamping mechanism also includes a bending connecting rod (6), a clamping block (8) and a slider (19). The upper surface of the sliding seat (3) is symmetrically fixed with a hinge shaft one on both sides of the guide rod (5). The bottom surface of the clamping block (8) is provided with a sliding groove. The upper surface of the clamping block (8) is fixedly installed with a hinge shaft two. The bending connecting rod (6) is roughly "L" shaped. Two clamping blocks (8) are symmetrically slidably connected on the sliding bar (7); A slider (19) is slidably connected in the guide groove on the base (1), and a hinge shaft is installed on the plane of the slider (19). One end of the bent connecting rod (6) is hinged to the hinge shaft on the sliding seat (3), the other end of the bent connecting rod (6) is hinged to the hinge shaft on the clamping block (8), and the middle bend of the bent connecting rod (6) is hinged to the hinge shaft on the slider (19).

4. A precision positioning fixture for machining precision parts according to claim 3, characterized in that, Rubber pads (9) are fixedly installed on the opposite surfaces of the clamping blocks (8) on both sides.

5. A precision positioning fixture for machining precision parts according to claim 2, characterized in that, The anti-reverse mechanism includes a lead screw (2), a second chuck (15), a push rod (16), and a second spring (17). The lead screw (2) is fixedly installed on the outer wall of the sliding seat (3). The lead screw (2) is threadedly connected to the threaded hole on the base (1). A limit plate is fixedly installed on the end face of the lead screw (2) on the other side of the support plate on the base (1). A push rod (16) is fixedly installed on the plane of the limit plate. A second spring (17) is fixedly installed on the plane of the limit plate corresponding to the periphery of the push rod (16). The second chuck (15) is slidably connected to the push rod (16). The other end of the second spring (17) is fixedly connected to the plane of the second chuck (15). The chuck 2 (15) has densely packed teeth on the arc surface of the side opposite to the push rod (16).

6. A precision positioning fixture for machining precision parts according to claim 5, characterized in that, The anti-reverse mechanism also includes a rotating block (13) and a chuck one (14). The push rod (16) is located on the other end of the chuck two (15) and the chuck one (14) is coaxially fixedly installed. The rotating block (13) is fixedly connected to the plane of the chuck one (14). The teeth on the first chuck (14) correspond to the teeth on the second chuck (15).

7. A precision positioning fixture for machining precision parts according to claim 1, characterized in that, The upper surface of the processing table (10) is fixedly equipped with multiple rubber blocks (11) in a matrix. The processing table (10) has multiple honeycomb holes (18) inside.

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