Novel precision machining clamp

Abstract

The invention belongs to the technical field of clamps, and discloses a novel precision machining clamp which comprises a base, clamping assemblies are annularly and fixedly installed on the top of the base at equal angles, and a protective pad is fixedly installed on the top of the base. By arranging a transmission rod, a fixing frame, a limiting barrel and the like, the purpose of clamping and positioning a hub is achieved, the top of a bearing ring and the top of a buffer pad make contact with the bottom in the hub, water in the limiting barrel enters a sliding groove through a first communicating hole at the moment, the water pressure in the sliding groove is gradually increased, and the water pressure in the sliding groove is increased; the transmission rods, the limiting blocks and the protruding blocks are pushed to the outer ends, due to the fact that the transmission rods move to the outer ends at the same time, the outer sides of the protruding blocks make contact with the interior of the hub at the same time in the moving process, the hub is pushed to move in the contact process, and therefore the hub is limited, and meanwhile the inner wall of the hub is supported and fixed through the protruding blocks; therefore, the effect of clamping and positioning the hub is achieved.

Description

Technical Field

[0001] This invention belongs to the field of fixture technology, specifically a novel precision machining fixture. Background Technology

[0002] The new precision machinery includes the processing of automotive wheel hubs. A fixture is a device used to fix the workpiece. A wheel hub is a cylindrical metal component, centered on an axle, that supports the tire's inner contour. It is also called a wheel rim, steel rim, wheel, or tire rim. Wheel hubs come in many varieties depending on their diameter, width, forming method, and material. This invention focuses on clamping and fixing during wheel hub processing.

[0003] Currently, wheel hub processing requires fixing the hub to facilitate cutting its shape. Most wheel hub clamping devices use clips to secure the hub around its perimeter. However, the hub needs to be positioned during clamping to ensure it is centered within the clips. Currently, wheel hub positioning is mostly done manually, which requires skilled operators and cannot achieve precise adjustments. This can lead to clips not fully engaging the hub, causing it to wobble and increasing the risk of accidents during processing. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the problems mentioned in the background art, this invention provides a novel precision machining fixture. Water is injected into the limiting cylinder through a water inlet pipe. As the water enters the lower end of the limiting cylinder, the water pressure inside gradually increases, pushing the sealing ring, support rod, and limiting rod upwards. This causes the top of the receiving ring and buffer pad to contact the bottom of the wheel hub. At this time, the water inside the limiting cylinder enters the sliding groove through the first connecting hole. The water pressure inside the sliding groove gradually increases, pushing the transmission rod, limiting block, and protrusion outwards. Since the transmission rod moves outwards simultaneously, the outer side of the protrusion contacts the inside of the wheel hub during this movement, pushing the wheel hub to move, thus limiting the wheel hub's position.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a novel precision machining fixture, comprising a base, a clamping assembly fixedly mounted at an equal angle on the top of the base, a protective pad fixedly mounted on the top of the base, an annular piece fixedly mounted on the top of the base outside the clamping assembly, a sleeve assembly fixedly mounted in the middle of the base, a limit assembly fixedly mounted inside the sleeve assembly, a hub placed on the top of the base, and a protective ring fixedly mounted on the top of the base outside the sleeve assembly.

[0008] Preferably, the sleeve assembly includes a second connecting hole, a limiting cylinder, and a water inlet pipe. The limiting cylinder is fixedly installed in the middle of the base, and the water inlet pipe is fixedly installed on one side of the limiting cylinder. The second connecting hole is formed at equal angles in the annular shape inside the base.

[0009] Preferably, the limiting assembly includes a fixed frame, a buffer pad, a receiving ring, a transmission rod, a limiting block, a protrusion, a second spring, a sliding groove, a limiting rod, a support rod, a sealing ring, and a first communicating hole. A sealing ring is movably fitted inside the second communicating hole. A support rod is fixedly installed on the top of the sealing ring. A limiting rod is fixedly installed at an equal angle around the top of the sealing ring and outside the support rod. A fixed frame is fixedly installed on the top of the support rod. A buffer pad is fixedly installed on the top of the fixed frame. A receiving ring is fixedly installed on the top of the buffer pad. Sliding grooves are formed on the four sides inside the fixed frame. Transmission rods are movably fitted inside the sliding grooves. Limiting blocks are fixedly installed on the outer sides of the transmission rods. Protrusions are fixedly installed on the outer sides of the limiting blocks. Second springs are fixedly installed on the left and right sides of the transmission rod. A first communicating hole is formed in the middle of the support rod.

[0010] Preferably, the clamping assembly includes a limiting ring, a first spring, a sealing groove, a sealing gasket, a contact block, and a clamping block. The limiting ring is fixedly installed at an equal angle on the top of the base. The limiting ring has a sealing groove inside. The clamping block is hinged to the inner wall of the limiting ring. The sealing gasket is fixedly installed on the inner wall of the clamping block. The first spring is fixedly installed inside the sealing groove. The contact block is fixedly installed on the inner side of the clamping block.

[0011] Preferably, the sliding groove is connected to the interior of the first connecting hole, and the first connecting hole passes through the middle of the sealing ring and the support rod.

[0012] Preferably, the outer side of the limiting block is arc-shaped, the outer side of the protrusion is provided with a protrusion made of rubber, one side of the second spring is fixedly connected to one side of the transmission rod, and the other side of the second spring is fixedly connected to the inner wall of the sliding groove.

[0013] Preferably, the limiting rods are movably inserted through the top of the limiting cylinder, the top of the limiting rods are fixedly connected to the bottom of the fixing frame, a sealing ring is provided between the support rod and the limiting cylinder, and a sealing ring is provided in the middle of the outer part of the sealing ring.

[0014] Preferably, the top of the second connecting hole is connected to the upper end of the inside of the limiting cylinder, and the bottom of the second connecting hole is connected to the inside of the sealing groove in the clamping assembly.

[0015] Preferably, the inner diameter of the four limiting rings is greater than the outer diameter of the wheel hub, and both the protective pad and the annular plate are made of rubber.

[0016] Preferably, one side of the first spring is fixedly connected to the outer side of the inner wall of the limiting ring, and the other side of the first spring is fixedly connected to the back of the clamping block. Sealing gaskets are fixedly installed around the back of the clamping block, and the outer sides of the sealing gaskets are fixedly connected to the inner wall of the limiting ring.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention achieves the purpose of wheel hub clamping and positioning by setting up a transmission rod, a fixing frame, and a limiting cylinder. Water is injected into the limiting cylinder through the water inlet pipe. As the water enters the lower end of the limiting cylinder, the water pressure inside the limiting cylinder gradually increases, pushing the sealing ring, support rod, and limiting rod upward. This causes the top of the receiving ring and buffer pad to contact the bottom of the wheel hub. At this time, the water inside the limiting cylinder enters the sliding groove through the first connecting hole. The water pressure inside the sliding groove gradually increases and pushes the transmission rod, limiting block, and protrusion outward. As the transmission rod moves outward simultaneously, the outer side of the protrusion contacts the inside of the wheel hub during the movement. During the contact, the wheel hub is pushed to move, thereby limiting the wheel hub. At the same time, the protrusion supports and fixes the inner wall of the wheel hub, thus achieving the effect of wheel hub clamping and positioning.

[0020] This invention achieves a good wheel hub clamping effect by setting a second connecting hole, clamping block and contact block. During the upward movement of the sealing ring, the gas at the upper end of the limiting cylinder is compressed. The gas at the upper end of the limiting cylinder enters the sealing groove through the second connecting hole. The air pressure inside the four limiting rings gradually increases and pushes the upper end of the clamping block to rotate inward. At the same time, the first spring and the sealing gasket are stretched. The sealing gasket seals the inside of the limiting ring to prevent gas from escaping. When the clamping block is folded, the inner side of the contact block will contact the bottom of the wheel hub and clamp and fix the wheel hub around its perimeter through the clamping block, making the wheel hub more stable during processing, thereby achieving the purpose of good wheel hub clamping effect.

[0021] This invention achieves the purpose of cooling during wheel hub processing by incorporating a sliding groove, a receiving ring, and a buffer pad. After the wheel hub is clamped and fixed, its surface can be processed. When water enters the sliding groove, it pushes the transmission rod to support the inner wall of the wheel hub. The sliding groove is filled with water, and the temperature of the water is transferred through the receiving rings, exchanging heat with the heat generated during wheel hub processing. This cools the surface of the wheel hub, improves the processing efficiency, and achieves the desired cooling effect during wheel hub processing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall appearance of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the external appearance of the structural limiting component of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the structural limiting component of the present invention;

[0025] Figure 4 This is a top sectional view of the fixing frame of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the clamping assembly of the present invention;

[0027] Figure 6 The structure of this invention Figure 5 Enlarged view of point A;

[0028] Figure 7 This is a schematic diagram of the external appearance of the limiting block of the present invention.

[0029] In the diagram: 1. Base; 2. Protective pad; 3. Hub; 4. Clamping assembly; 401. Limiting ring; 402. First spring; 403. Sealing groove; 404. Sealing gasket; 405. Contact block; 406. Clamping block; 5. Protective ring; 6. Limiting assembly; 601. Fixing frame; 602. Buffer pad; 603. Receiving ring; 604. Transmission rod; 605. Limiting block; 606. Protrusion; 607. Second spring; 608. Sliding groove; 609. Limiting rod; 610. Support rod; 611. Sealing ring; 612. First connecting hole; 7. Annular piece; 8. Sleeve assembly; 801. Second connecting hole; 802. Limiting cylinder; 803. Water inlet pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 7 As shown, the present invention provides a novel precision machining fixture, including a base 1, a clamping assembly 4 fixedly installed at an equal angle on the top of the base 1, a protective pad 2 fixedly installed on the top of the base 1, an annular piece 7 fixedly installed on the top of the base 1 outside the clamping assembly 4, a sleeve assembly 8 fixedly installed in the middle of the base 1, a limit assembly 6 fixedly installed inside the sleeve assembly 8, a hub 3 placed on the top of the base 1, and a protective ring 5 fixedly installed on the top of the base 1 outside the sleeve assembly 8.

[0032] The above solution involves placing the hub 3 on top of the base 1, protecting the outside of the hub 3 with the protective pad 2, injecting water into the lower end of the limiting cylinder 802, and lifting the fixing frame 601 upwards so that the top of the receiving ring 603 and the buffer pad 602 contacts the bottom of the hub 3. At this time, the water inside the limiting cylinder 802 enters the sliding groove 608 through the first connecting hole 612, and pushes the transmission rod 604 and the limiting block 605 respectively, so that the outer side of the protrusion 606 contacts the inner wall of the hub 3, thereby limiting the hub 3 and fixing it, thus improving the stability of the hub 3 during the processing.

[0033] like Figure 3 , Figure 4 , Figure 5 , Figure 7As shown, the sleeve assembly 8 includes a second connecting hole 801, a limiting cylinder 802, and a water inlet pipe 803. The limiting cylinder 802 is fixedly installed in the middle of the base 1, and the water inlet pipe 803 is fixedly installed on one side of the limiting cylinder 802. The second connecting hole 801 is opened at equal angles in the annular shape inside the base 1. The limiting assembly 6 includes a fixing frame 601, a buffer pad 602, a receiving ring 603, a transmission rod 604, a limiting block 605, a protrusion 606, a second spring 607, a sliding groove 608, a limiting rod 609, a support rod 610, a sealing ring 611, and a first connecting hole 612. The sealing ring 611 is movably sleeved inside the second connecting hole 801, and the support rod 610 is fixedly installed on the top of the sealing ring 611. A limiting rod 609 is fixedly installed at the top of the support rod 610 and at an equal angle to the outside of the support rod 610. A fixing frame 601 is fixedly installed on the top of the fixing frame 601. A buffer pad 602 is fixedly installed on the top of the buffer pad 602. A receiving ring 603 is fixedly installed on the top of the buffer pad 602. Sliding grooves 608 are respectively opened on the four sides inside the fixing frame 601. A transmission rod 604 is movably sleeved inside the sliding groove 608. A limiting block 605 is fixedly installed on the outside of the transmission rod 604. A protrusion 606 is fixedly installed on the outside of the limiting block 605. A second spring 607 is fixedly installed on the left and right sides of the transmission rod 604. A first connecting hole 612 is opened in the middle of the support rod 610.

[0034] Using the above solution: When the shape of the hub 3 needs to be processed, first place the hub 3 on the top of the base 1 and fit it onto the outside of the limiting component 6 and the sleeve component 8. Then connect the water inlet pipe 803 to the water pump, start the water pump, and inject water into the limiting cylinder 802 through the water inlet pipe 803. The water enters the lower end of the limiting cylinder 802 and simultaneously enters the first connecting hole 612. The transmission rod 604 is supported by the second spring 607. The water pressure inside the limiting cylinder 802 gradually increases, pushing the sealing ring 611, the support rod 610, and the limiting rod 609 upward. The sealing ring 611 slides upward on the limiting cylinder 802. Inside 2, the fixing bracket 601 is lifted, so that the top of the receiving ring 603 and the buffer pad 602 contact the bottom of the inside of the hub 3. At this time, under the pressure of the hub 3's own weight, the water inside the limiting cylinder 802 will enter the sliding groove 608 through the first connecting hole 612. The water pressure inside the sliding groove 608 gradually increases and pushes the transmission rod 604, the limiting block 605 and the protrusion 606 outward. As the transmission rod 604 moves outward at the same time, the outer side of the protrusion 606 will contact the inside of the hub 3 at the same time during the movement. During the contact, the hub 3 will be pushed to move, thereby limiting the hub 3.

[0035] like Figure 5 , Figure 6As shown, the clamping assembly 4 includes a limiting ring 401, a first spring 402, a sealing groove 403, a sealing gasket 404, a contact block 405, and a clamping block 406. The limiting ring 401 is fixedly installed at an equal angle on the top of the base 1. The limiting ring 401 has a sealing groove 403 inside. The clamping block 406 is hinged to the inner wall of the limiting ring 401. The sealing gasket 404 is fixedly installed on the inner wall of the clamping block 406. The first spring 402 is fixedly installed inside the sealing groove 403. The contact block 405 is fixedly installed on the inner side of the clamping block 406.

[0036] The above scheme is adopted as follows: During the upward movement of the sealing ring 611, the gas at the upper end of the limiting cylinder 802 is compressed. The gas at the upper end of the limiting cylinder 802 enters the sealing groove 403 through the second connecting hole 801. The air pressure inside the four limiting rings 401 gradually increases and pushes the upper end of the clamping block 406 to rotate inward. At the same time, the first spring 402 and the sealing gasket 404 are stretched. The sealing gasket 404 seals the inside of the limiting ring 401 to prevent gas from escaping. When the clamping block 406 is folded, the inner side of the contact block 405 will contact the bottom of the outer side of the wheel hub 3, and the clamping block 406 will clamp and fix the wheel hub 3 around, making the wheel hub 3 more stable during the processing.

[0037] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the sliding groove 608 is connected to the interior of the first connecting hole 612. The first connecting hole 612 passes through the middle of the sealing ring 611 and the support rod 610. The outer side of the limiting block 605 is arc-shaped. The outer side of the protrusion 606 is provided with a protrusion. The protrusion 606 is made of rubber. One side of the second spring 607 is fixedly connected to one side of the transmission rod 604. The other side of the second spring 607 is fixedly connected to the inner wall of the sliding groove 608. The limiting rods 609 are movably passed through the top of the limiting cylinder 802. The top of the limiting rods 609 is fixedly connected to the bottom of the fixing frame 601. A sealing ring is provided between the support rod 610 and the limiting cylinder 802. A sealing ring is provided in the middle of the outer side of the sealing ring 611.

[0038] The above scheme is adopted: water flows into the interior of the limiting cylinder 802 through the inlet pipe 803. The water pressure at the lower end of the limiting cylinder 802 gradually increases, pushing the sealing ring 611, support rod 610, and fixing frame 601 upward, so that the top of the receiving ring 603 and the buffer pad 602 contact the top of the interior of the hub 3. At this time, the water inside the limiting cylinder 802 will enter the interior of the sliding groove 608 through the first connecting hole 612. The water pressure inside the sliding groove 608 gradually increases, pushing the transmission rod 604 outward, squeezing the second spring 607. The transmission rod 604 moves outward, so that the outer side of the limiting block 605 and the protrusion 606 contacts the inner wall of the hub 3. The protrusion on the outside of the protrusion 606 improves the stability of the support for the hub 3. At the same time, the arc shape of the protrusion 606 fits more closely to the inner wall of the hub 3.

[0039] like Figure 2 , Figure 5 , Figure 6 As shown, the top of the second connecting hole 801 is connected to the upper end of the inside of the limiting cylinder 802, and the bottom of the second connecting hole 801 is connected to the inside of the sealing groove 403 in the clamping assembly 4. The inner diameter of the four limiting rings 401 is greater than the outer diameter of the hub 3. The protective pad 2 and the annular plate 7 are both made of rubber. One side of the first spring 402 is fixedly connected to the outer side of the inner wall of the limiting ring 401, and the other side of the first spring 402 is fixedly connected to the back of the clamping block 406. Sealing pads 404 are fixedly installed around the back of the clamping block 406, and the outer side of the sealing pads 404 is fixedly connected to the inner wall of the limiting ring 401.

[0040] Using the above scheme: by injecting water into the limiting cylinder 802, the water pressure inside the limiting cylinder 802 gradually increases and pushes the sealing ring 611 upward. During the upward movement of the sealing ring 611, the gas at the upper end of the limiting cylinder 802 will be squeezed. The gas will enter the limiting ring 401 through the second connecting hole 801. The air pressure inside the limiting ring 401 gradually increases and pushes the clamping block 406 outward, stretching the first spring 402. At the same time, the sealing gasket 404 seals the inside of the limiting ring 401. The inner side of the clamping block 406 will contact the outside of the wheel hub 3, thereby clamping the wheel hub 3.

[0041] Working principle and usage process of this invention:

[0042] When machining the shape of the wheel hub 3, first place the wheel hub 3 on top of the base 1 and fit it onto the outside of the limiting component 6 and the sleeve component 8. Then connect the water inlet pipe 803 to the water pump, start the water pump, and inject water into the limiting cylinder 802 through the water inlet pipe 803. The water enters the lower end of the limiting cylinder 802 and simultaneously enters the first connecting hole 612, and is supported by the second spring 607 on the transmission rod 604. The water pressure inside the limiting cylinder 802 gradually increases, and the seal is closed. Ring 611, support rod 610 and limiting rod 609 are pushed upward, and sealing ring 611 slides upward inside limiting cylinder 802. The fixing bracket 601 is lifted up, so that the top of the receiving ring 603 and the buffer pad 602 contact the bottom of the inside of the hub 3. At this time, under the pressure of the weight of the hub 3 itself, the water inside the limiting cylinder 802 will enter the sliding groove 608 through the first connecting hole 612. The water pressure inside the sliding groove 608 gradually increases and pushes the transmission rod 604, the limiting block 605 and the protrusion 606 outward. As the transmission rod 604 moves outward at the same time, the outer side of the protrusion 606 will contact the inside of the hub 3 at the same time during the movement. During the contact, the hub 3 will be pushed to move, thereby limiting the hub 3. At the same time, the inner wall of the hub 3 is supported and fixed by the protrusion 606.

[0043] Simultaneously, as the sealing ring 611 moves upward, the gas at the upper end of the limiting cylinder 802 is compressed. The gas at the upper end of the limiting cylinder 802 enters the sealing groove 403 through the second connecting hole 801. The air pressure inside the four limiting rings 401 gradually increases and pushes the upper end of the clamping block 406 to rotate inward. At the same time, the first spring 402 and the sealing gasket 404 are stretched. The sealing gasket 404 seals the inside of the limiting ring 401 to prevent gas from escaping. When the clamping block 406 is folded, the inner side of the contact block 405 will contact the bottom of the outer side of the hub 3 and clamp and fix the hub 3 around its perimeter through the clamping block 406, making the hub 3 more stable during the processing.

[0044] After the hub 3 is clamped and fixed, the surface of the hub 3 can be processed. When water enters the interior of the sliding groove 608, it pushes the transmission rod 604 to support the inner wall of the hub 3. The interior of the sliding groove 608 will be filled with water. The temperature of the water is transferred through the receiving ring 603 and exchanged with the heat generated during the processing of the hub 3, thereby cooling the surface of the hub 3.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new precision mechanical machining fixture comprising a base (1), characterized in that: A clamping assembly (4) is fixedly installed at an equal angle on the top of the base (1). A protective pad (2) is fixedly installed on the top of the base (1). An annular piece (7) is fixedly installed on the top of the base (1) outside the clamping assembly (4). A sleeve assembly (8) is fixedly installed in the middle of the base (1). A limit assembly (6) is fixedly installed inside the sleeve assembly (8). A hub (3) is placed on the top of the base (1). A protective ring (5) is fixedly installed on the top of the base (1) outside the sleeve assembly (8).

2. A novel precision machining fixture according to claim 1, characterized in that: The sleeve assembly (8) includes a second connecting hole (801), a limiting cylinder (802) and a water inlet pipe (803). The limiting cylinder (802) is fixedly installed in the middle of the base (1), and the water inlet pipe (803) is fixedly installed on one side of the limiting cylinder (802). The second connecting hole (801) is opened in the annular shape at equal angles inside the base (1).

3. A novel precision machining fixture according to claim 2, characterized in that: The limiting component (6) includes a fixing frame (601), a buffer pad (602), a receiving ring (603), a transmission rod (604), a limiting block (605), a protrusion (606), a second spring (607), a sliding groove (608), a limiting rod (609), a support rod (610), a sealing ring (611), and a first connecting hole (612). The sealing ring (611) is movably sleeved inside the second connecting hole (601). The support rod (610) is fixedly installed on the top of the sealing ring (611). The limiting rod (609) is fixedly installed at an equal angle in a ring shape on the top of the sealing ring (611) and outside the support rod (610). The top of the support rod (610) is fixed... A fixed frame (601) is installed, a buffer pad (602) is fixedly installed on the top of the fixed frame (601), a receiving ring (603) is fixedly installed on the top of the buffer pad (602), a sliding groove (608) is opened on each of the four sides inside the fixed frame (601), a transmission rod (604) is movably sleeved inside the sliding groove (608), a limit block (605) is fixedly installed on the outside of the transmission rod (604), a protrusion (606) is fixedly installed on the outside of the limit block (605), a second spring (607) is fixedly installed on the left and right sides of the transmission rod (604), and a first connecting hole (612) is opened in the middle of the support rod (610).

4. A novel precision machining fixture according to claim 1, characterized in that: The clamping assembly (4) includes a limiting ring (401), a first spring (402), a sealing groove (403), a sealing gasket (404), a contact block (405), and a clamping block (406). The limiting ring (401) is fixedly installed at an equal angle on the top of the base (1). The limiting ring (401) has a sealing groove (403) inside. The clamping block (406) is hinged to the inner wall of the limiting ring (401). The sealing gasket (404) is fixedly installed on the inner wall of the clamping block (406). The first spring (402) is fixedly installed inside the sealing groove (403). The contact block (405) is fixedly installed on the inner side of the clamping block (406).

5. A novel precision machining fixture according to claim 3, characterized in that: The sliding groove (608) is connected to the interior of the first connecting hole (612), and the first connecting hole (612) passes through the middle of the sealing ring (611) and the support rod (610).

6. A novel precision mechanical machining fixture according to claim 3, characterized in that: The outer side of the limiting block (605) is arc-shaped, and the outer side of the protrusion (606) is provided with a protrusion. The protrusion (606) is made of rubber material. One side of the second spring (607) is fixedly connected to one side of the transmission rod (604), and the other side of the second spring (607) is fixedly connected to the inner wall of the sliding groove (608).

7. A novel precision mechanical machining fixture according to claim 3, characterized in that: The limiting rods (609) are respectively movably inserted through the top of the limiting cylinder (802), and the top of the limiting rods (609) are respectively fixedly connected to the bottom of the fixing frame (601). A sealing ring is provided between the support rod (610) and the limiting cylinder (802), and a sealing ring is provided in the middle of the outer part of the sealing ring (611).

8. A novel precision machining fixture according to claim 2, characterized in that: The top of the second connecting hole (801) is connected to the upper end of the inside of the limiting cylinder (802), and the bottom of the second connecting hole (801) is connected to the inside of the sealing groove (403) in the clamping assembly (4).

9. A novel precision mechanical machining fixture according to claim 4, characterized in that: The inner diameter of the four limiting rings (401) is greater than the outer diameter of the hub (3), and the protective pad (2) and the annular piece (7) are both made of rubber.

10. A novel precision mechanical machining fixture according to claim 4, characterized in that: One side of the first spring (402) is fixedly connected to the outer side of the inner wall of the limiting ring (401), and the other side of the first spring (402) is fixedly connected to the back of the clamping block (406). Sealing gaskets (404) are fixedly installed around the back of the clamping block (406), and the outer side of the sealing gaskets (404) is fixedly connected to the inner wall of the limiting ring (401).

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