Positioning tooling for workpieces and machining apparatus

Abstract

The application provides a positioning tool for a workpiece and a machining device, and belongs to the field of machining. The positioning tool comprises a positioning tube and a liquid seal assembly corresponding to the positioning tube. A first connecting end of the positioning tube is in communication with a negative pressure pipeline, and a second connecting end is used for adsorbing a workpiece to be machined. The liquid seal assembly comprises a liquid storage tube and a liquid outlet block. The liquid storage tube is uniformly arranged around the axis of the positioning tube. The axis of each liquid storage tube is parallel to the axis of the positioning tube, and each liquid storage tube is arranged on the tube wall of the positioning tube. An end surface of the second connecting end is provided with a mounting hole for mounting the liquid storage tube. The elastic expansion direction of the liquid outlet block is parallel to the axis of the liquid storage tube. The inner diameter of the liquid outlet is smaller than the diameter of the liquid outlet block. The liquid outlet block is elastically connected to the liquid storage tube and can seal against the inner edge of the liquid outlet. The liquid outlet has a protruding portion which can protrude from the liquid outlet. The positioning tool for the workpiece provided by the application can solve the technical problem that the adsorption device has an unsatisfactory adsorption and positioning effect on the workpiece.

Description

Technical Field

[0001] This invention belongs to the field of machining, and more specifically, it relates to a workpiece positioning fixture. This invention also relates to a machining equipment. Background Technology

[0002] A robotic arm is an automated device that mimics certain movements and functions of a human hand and arm to grasp, move objects, or manipulate tools according to a fixed program. Its key feature is that it can be programmed to perform various pre-defined tasks, and its design and performance combine the advantages of both human and robotic arms.

[0003] The robotic arm is the earliest industrial robot and the earliest modern robot. It can replace heavy human labor to realize the mechanization and automation of production. It can operate in harmful environments to protect personal safety. Therefore, it is widely used in machinery manufacturing, metallurgy, electronics, light industry and atomic energy sectors.

[0004] A robotic arm mainly consists of three parts: the actuator, the drive mechanism, and the control system. The hand is the part used to grasp the workpiece (or tool). Depending on the shape, size, weight, material, and operational requirements of the object being grasped, there are various structural forms, such as clamping type, supporting type, and suction type.

[0005] For adsorption-type robotic arms, the primary method is to use suction components that generate negative pressure to adsorb workpieces, and then achieve controllable displacement of the workpieces through the movement of the robotic arm. Existing suction components mainly include metal suction cups and flexible rubber suction cups, both of which can be connected to a vacuum pump to create negative pressure for workpiece suction. However, due to the inconvenience of adsorption on the external structure of machined parts, existing suction components are relatively large and cannot adsorb smaller machined parts. Some small suction heads, used in chip packaging, cannot reliably adsorb and fix workpieces during machining due to poor structural strength and adsorption effect, thus failing to provide a consistently stable and reliable adsorption effect. Therefore, when a workpiece needs to be machined, it must be placed on a fixture for positioning. However, this process is not conducive to improving machining efficiency, and in the current technology, this step cannot be omitted to ensure machining accuracy, thus requiring improvement. Summary of the Invention

[0006] The purpose of this invention is to provide a workpiece positioning fixture to solve the technical problem that existing adsorption equipment does not achieve ideal adsorption and positioning effects for small workpieces.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a positioning fixture for a workpiece is provided, comprising a positioning tube and a liquid sealing assembly corresponding to the positioning tube. The positioning tube has a first connecting end and a second connecting end located at two axial ends respectively. The first connecting end is connected to a negative pressure pipeline, and the second connecting end is used to adsorb the workpiece to be processed.

[0008] The liquid sealing assembly includes multiple liquid storage tubes and liquid outlet blocks corresponding to each liquid storage tube. Multiple liquid storage tubes are evenly arranged around the axis of the positioning tube, with the axis of each liquid storage tube parallel to the axis of the positioning tube and located on the tube wall of the positioning tube. The end face of the second connecting end has mounting holes for installing the liquid storage tubes, and the axis of each mounting hole is parallel to the axis of the positioning tube. The end face of the liquid outlet of each liquid storage tube is flush with the end face of the second connecting end. The liquid outlet block is elastically connected to the liquid storage tube and can seal against the inner edge of the liquid outlet. The elastic extension / contraction direction of the liquid outlet block is parallel to the axis of the liquid storage tube. The inner diameter of the liquid outlet is smaller than the diameter of the liquid outlet block, and it has a protruding portion that protrudes beyond the liquid outlet.

[0009] In one possible implementation, the liquid seal assembly further includes a support spring disposed within the liquid storage tube, the elastic extension direction of the support spring being parallel to the axis of the liquid storage tube, a coaxial first snap-fit ​​ring being formed on the inner wall of the liquid storage tube, the two ends of the support spring respectively abutting the liquid outlet block and the first snap-fit ​​ring, and being configured to have a preload force that causes the liquid outlet block to abut against the inner edge of the liquid outlet.

[0010] In one possible implementation, the liquid outlet block is a spherical member, and the liquid outlet block is rotatably located between the liquid outlet and the support spring.

[0011] In one possible implementation, the liquid seal assembly further includes a support shaft coaxially disposed within the liquid storage tube. Along the axial direction of the positioning tube, the distance between the end of the support shaft near the liquid outlet and the end face of the liquid outlet is equal to the diameter of the liquid outlet block. The support spring is sleeved on the outer wall of the support shaft.

[0012] In one possible implementation, the positioning fixture for the workpiece includes at least two positioning tubes with mutually perpendicular axes, and two liquid seal assemblies corresponding one-to-one with the two positioning tubes.

[0013] In one possible implementation, a buffer sleeve is fitted on the outer wall of the positioning tube adjacent to the second connecting end. The buffer sleeve has a buffer end protruding from the end face of the second connecting end, and the inner diameter of the buffer end is not less than the outer diameter of the second connecting end.

[0014] In one possible implementation, the mounting hole is a blind hole, and a magnet is sealed to one end of the liquid storage tube away from the liquid outlet, the magnet being magnetically compatible with the bottom end of the mounting hole.

[0015] In one possible implementation, the liquid seal assembly further includes a limiting shaft disposed in the liquid storage tube. One end of the limiting shaft is fixedly connected to the liquid outlet block, and the other end is formed with a second snap-fit ​​ring. Corresponding to the second snap-fit ​​ring, an annular groove is coaxially formed on the inner wall of the liquid storage tube adjacent to the first snap-fit ​​ring, and the annular groove is located on the side of the first snap-fit ​​ring away from the liquid outlet. The second snap-fit ​​ring is coaxially snapped into the annular groove.

[0016] In one possible implementation, the mounting hole is a through hole and has a first opening at the second connecting end and a second opening on the outer wall of the positioning tube. The end of the liquid storage tube away from the liquid outlet is connected to the outside through the second opening, and the liquid storage tube is provided with anti-leakage wax.

[0017] Compared with the prior art, the advantages of the workpiece positioning fixture provided by the present invention are as follows:

[0018] First, a negative pressure can be formed inside the positioning tube, allowing the present invention to adsorb the workpiece simply by contacting the second connecting end with it. Furthermore, the present invention employs a liquid seal to improve the sealing between the second connecting end and the workpiece, solving the technical problems of poor positioning accuracy and workpiece wobbling during processing caused by insufficient structural strength in existing flexible suction heads. Additionally, the present invention utilizes the elastic expansion and contraction of the liquid outlet block within the liquid storage tube. When the positioning tube contacts the workpiece, the contraction of the liquid outlet block causes liquid to gush out from the storage tube, forming a liquid sealing film on the second connecting end and the outer surface of the workpiece, improving the sealing performance when the positioning tube adsorbs the workpiece. Moreover, due to the tight fit between the second connecting end and the outer surface of the workpiece, the liquid in the liquid sealing film is squeezed and fills the tiny depressions on the surface of the workpiece and the end face of the second connecting end. This increases the sealing performance during adsorption without lubricating the second connecting end and the workpiece surface, effectively ensuring the stability of the adsorption connection between the second connecting end and the workpiece.

[0019] Another object of the present invention is to provide a processing apparatus, including a workpiece positioning fixture as described above.

[0020] Compared with the prior art, the processing equipment in this invention has all the advantages of the above-mentioned workpiece positioning fixture, which will not be elaborated here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 A schematic diagram of the overall structure of the positioning fixture for the workpiece provided by the present invention;

[0023] Figure 2 A cross-sectional view of the positioning fixture for the workpiece provided by the present invention;

[0024] Figure 3 A cross-sectional view of a workpiece positioning fixture provided in another embodiment of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of the area shown at point A in the middle.

[0026] In the picture:

[0027] 1. Positioning tube; 101. First connecting end; 102. Second connecting end; 103. Mounting hole; 11. Buffer sleeve;

[0028] 2. Liquid seal assembly; 21. Liquid storage tube; 201. Liquid outlet; 202. First retaining ring; 203. Annular groove; 22. Liquid outlet block; 23. Support spring; 24. Support shaft; 25. Magnet; 26. Limiting shaft; 261. Second retaining ring; 27. Sealing fluid; 28. Leak-proof wax;

[0029] 3. Workpiece. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0031] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "back" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention 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 invention.

[0032] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection can be a fixed 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, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] Please refer to the following: Figures 1 to 4 The positioning fixture for the workpiece provided by the present invention will now be described. The positioning fixture includes a positioning tube 1 and a liquid sealing assembly 2 corresponding to the positioning tube 1. The positioning tube 1 has a first connecting end 101 and a second connecting end 102 located at its two axial ends respectively. The first connecting end 101 is connected to a negative pressure pipeline, and the second connecting end 102 is used to adsorb the workpiece 3 to be processed. The liquid sealing assembly 2 includes multiple liquid storage tubes 21 and liquid outlet blocks 22 corresponding to each liquid storage tube 21. Multiple liquid storage tubes 21 are evenly arranged around the axis of the positioning tube 1, and the axis of each liquid storage tube 21 is parallel to the axis of the positioning tube 1 and is embedded in the positioning tube. Inside the wall of pipe 1; the end face of the second connecting end 102 is provided with a mounting hole 103 for installing the liquid storage pipe 21, and the axis of each mounting hole 103 is parallel to the axis of the positioning pipe 1. The end face of the liquid outlet 201 of the liquid storage pipe 21 is flush with the end face of the second connecting end 102; the liquid outlet block 22 is elastically connected in the liquid storage pipe 21, and the elastic movement direction of the liquid outlet block 22 is parallel to the axis of the liquid storage pipe 21. The inner diameter of the liquid outlet 201 is smaller than the diameter of the liquid outlet block 22. In the free state, the liquid outlet block 22 seals against the inner wall of the liquid outlet 201 and protrudes from the liquid outlet 201.

[0035] The specific usage process of this embodiment is as follows: During the process of contacting the workpiece 3 to be adsorbed, the liquid outlet block 22 protruding from the liquid outlet 201 of the second connecting end 102 of the positioning tube 1 first contacts the outer surface of the workpiece 3 to be adsorbed, and then retracts into the liquid storage tube 21. During this process, the liquid outlet block 22 releases its contact with the inner edge of the liquid outlet 201, allowing the sealing liquid 27 in the liquid storage tube 21 to flow out from the liquid outlet 201 and adhere to the end face of the second connecting end 102. When the second connecting end 102 abuts against the workpiece 3 to be adsorbed, the sealing liquid 27 is squeezed and fills the recessed area on the surface of the second connecting end 102 and the workpiece 3 to be adsorbed. After the positioning tube 1 forms a sealed connection between the second connecting end 102 and the workpiece 3 to be adsorbed, it adsorbs the workpiece 3, thereby achieving stable positioning of the workpiece 3.

[0036] In this embodiment, a negative pressure can be formed inside the positioning tube 1. Therefore, the second connecting end 102 can be used to contact the workpiece 3 to be processed to adsorb the workpiece 3. In addition, the present invention uses liquid sealing to improve the sealing between the second connecting end 102 and the workpiece 3 to be processed. While using a metal suction head, it can also form an effective adsorption of the workpiece 3, thereby solving the technical problems of poor positioning accuracy of the workpiece 3 to be processed and easy shaking of the workpiece 3 during processing caused by insufficient structural strength of existing flexible suction heads. Furthermore, this invention utilizes the elastic expansion and contraction of the liquid outlet block 22 within the liquid storage tube 21. When the positioning tube 1 contacts the workpiece 3 to be processed, the contraction of the liquid outlet block 22 causes the liquid in the liquid storage tube 21 to gush out, thereby forming a liquid sealing film on the outer surface of the second connecting end 102 and the workpiece 3, improving the sealing performance when the positioning tube 1 adsorbs the workpiece 3. Moreover, due to the close contact between the second connecting end 102 and the outer surface of the workpiece 3, the liquid in the liquid sealing film can fill the tiny depressions on the surface of the workpiece 3. This not only increases the sealing performance when the positioning tube 1 adsorbs the workpiece but also prevents lubrication of the second connecting end 102 and the surface of the workpiece 3, effectively ensuring the stability of the adsorption connection between the second connecting end 102 and the workpiece 3.

[0037] Optionally, in this embodiment, the sealing fluid 27 of the reservoir 21 can be made of ethylene glycol or a mixture of ethylene glycol and water.

[0038] Optionally, in this embodiment, the diameter of the positioning tube 1 is between 10mm and 20mm, and the diameter of the liquid outlet block 22 is between 1mm and 2mm. The diameter of the liquid outlet 201 can be flexibly set according to the diameter of the liquid outlet block 22 and the amount of liquid outlet of the sealing liquid 27, which will not be elaborated here.

[0039] Optionally, not shown in the accompanying drawings, in some embodiments the cross-sectional shape of the liquid outlet block 22 is similar to a "convex" shape, with the smaller diameter portion at its top protruding outside the liquid outlet 201, while the larger diameter portion is held in place by the liquid outlet 201. The larger diameter portion of the liquid outlet block 22 slides and adapts to the inner wall of the liquid storage tube 21 along its own extension and contraction direction. The transition portions of different diameters of the liquid outlet block 22 are formed with annular sealing chamfers. Corresponding to the sealing chamfers, annular inclined retaining rings are coaxially provided on the inner wall of the liquid storage tube 21. When the liquid outlet block 22 is not in contact with the workpiece 3 to be processed, the sealing chamfers are pushed by the elastic force and seal against the inclined retaining rings to prevent the viscosity coefficient of the sealing liquid 27 in the liquid storage tube 21 from increasing.

[0040] In some embodiments, the liquid sealing assembly 2 further includes a support spring 23 disposed in the liquid storage tube 21. The elastic extension direction of the support spring 23 is parallel to the axis of the liquid storage tube 21. A first locking ring 202 coaxial with the liquid storage tube 21 is formed on the inner wall of the liquid storage tube 21. The two ends of the support spring 23 abut against the liquid outlet block 22 and the first locking ring 202, respectively. The support spring 23 is configured to have a preload force that causes the liquid outlet block 22 to abut against the inner wall of the liquid outlet 201.

[0041] In this embodiment, the support spring 23 can provide elastic force to the liquid outlet block 22, so that the liquid outlet block 22 abuts against the inner edge of the liquid outlet 201, preventing the sealing liquid 27 from flowing out of the liquid storage pipe 21 when the liquid outlet block 22 is not in contact with the workpiece 3.

[0042] In some embodiments, the liquid outlet block 22 is a spherical member, and the liquid outlet block 22 is rotatably located between the liquid outlet 201 and the support spring 23.

[0043] In practice, as the positioning tube 1 approaches the workpiece 3, it may generate a relative displacement with respect to the workpiece 3 along its own radial direction. During this process, the spherical liquid outlet block 22 in this embodiment can use its own rolling motion to prevent scratching the outer surface of the workpiece 3 and facilitates the more even application of the sealing liquid 27 to the workpiece 3 to be processed.

[0044] In some embodiments, the liquid sealing assembly 2 further includes a support shaft 24 coaxially disposed in the liquid storage tube 21. Along the axial direction of the positioning tube 1, the distance between the end of the support shaft 24 near the liquid outlet 201 and the end face of the liquid outlet 201 is equal to the diameter of the liquid outlet block 22. A support spring 23 is sleeved on the outer wall of the support shaft 24.

[0045] In this embodiment, the support shaft 24 can limit the displacement of the liquid outlet block 22, preventing the liquid outlet block 22 from moving arbitrarily within the liquid storage tube 21. Furthermore, the support shaft 24 in this embodiment can guide the flow of the sealing liquid 27 within the liquid storage tube 21, making the process of the sealing liquid 27 flowing out from the outlet 201 smoother.

[0046] In some embodiments, the workpiece positioning fixture includes at least two positioning tubes 1 with mutually perpendicular axes, and two liquid seal assemblies 2 corresponding one-to-one with the two positioning tubes 1.

[0047] In this embodiment, the two positioning tubes 1 with mutually perpendicular axes can position the workpiece 3 from two different directions, thus improving the positioning and stability of the workpiece 3.

[0048] Furthermore, when using the workpiece positioning fixture in this embodiment to clamp the workpiece 3, generally speaking, multiple positioning tubes 1 can be set for a single workpiece 3, and each positioning tube 1 has at least three positioning tubes 1 with mutually perpendicular axes, thereby forming a three-dimensional positioning of the workpiece 3 and improving the positioning effect of the workpiece 3.

[0049] In some embodiments, a buffer sleeve 11 is provided on the outer wall of the positioning tube 1 adjacent to the second connecting end 102. The buffer sleeve 11 has a buffer end protruding from the end face of the second connecting end 102, and the inner diameter of the buffer end is not less than the outer diameter of the second connecting end 102.

[0050] In practical implementation, the spring 23 generally has weak elasticity and cannot effectively buffer the collision between the positioning tube 1 and the workpiece 3. However, the buffer sleeve 11 in this embodiment can buffer the collision between the positioning tube 1 and the workpiece 3. In addition, the buffer sleeve 11 can work together with the liquid sealing film to form a double seal, improving the sealing effect of the positioning tube 1. Moreover, the buffer sleeve 11 can cover the part where the positioning tube 1 and the workpiece 3 come into contact, which helps to improve the technical problem of the sealing liquid 27 evaporating and disappearing when the positioning tube 1 adsorbs the workpiece 3 for a long time.

[0051] In some embodiments, the mounting hole 103 is a blind hole, and a magnet 25 is sealed to one end of the liquid storage tube 21 away from the liquid outlet 201. The magnet 25 can be magnetically matched with the bottom end of the mounting hole 103.

[0052] This embodiment utilizes the magnetic attraction between the magnet 25 and the mounting hole 103 to make the installation of the liquid storage tube 21 in the mounting hole 103 more convenient and to prevent the liquid storage tube 21 from falling out of the mounting hole 103.

[0053] In some embodiments, the liquid sealing assembly 2 further includes a limiting shaft 26 disposed in the liquid storage tube 21. One end of the limiting shaft 26 is fixedly connected to the liquid outlet block 22, and the other end is formed with a second snap ring 261. The second snap ring 261 is located on the side of the first snap ring 202 away from the liquid outlet 201. Corresponding to the second snap ring 261, an annular groove 203 is coaxially formed on the inner wall of the liquid storage tube 21, and the second snap ring 261 is coaxially snapped into the annular groove 203.

[0054] In this embodiment, the limiting shaft 26 can prevent the support spring 23 from radially shifting during the extension and retraction process, which helps to keep the support spring 23 in a better working state.

[0055] In some embodiments, the mounting hole 103 is a through hole and has a first opening located at the second connecting end 102 and a second opening located on the outer wall of the positioning tube 1. One end of the liquid storage tube 21 away from the liquid outlet 201 is connected to the outside through the second opening, and the liquid storage tube 21 is provided with a leak-proof wax 28 to prevent leakage of internal sealing liquid.

[0056] In this embodiment, the mounting hole 103, which is configured as a through hole, helps to maintain consistent air pressure inside and outside the liquid storage tube 21, preventing leakage of the sealing liquid 27 inside the liquid storage tube 21 due to thermal expansion and contraction. Furthermore, the anti-leakage wax 28 inside the liquid storage tube 21 can move with the movement of the sealing liquid 27 surface, further preventing leakage of the sealing liquid 27 from the liquid storage tube 21.

[0057] In summary, the positioning tube 1 of the workpiece positioning fixture provided by this invention can form a negative pressure, thereby allowing the workpiece 3 to be adsorbed by contact between the second connecting end 102 and the workpiece 3. Furthermore, this invention employs liquid sealing to improve the sealing performance between the second connecting end 102 and the workpiece 3, and by using metal as the material for the positioning tube 1, the sealing performance between the first connecting end 101 and the workpiece 3 can also be guaranteed. This helps to solve the technical problems of poor positioning accuracy of existing flexible suction heads and the tendency of the workpiece 3 to shake during processing. Furthermore, when the liquid outlet block 22 abuts against the workpiece 3, it retracts. The present invention can utilize the sealing liquid 27 exposed in the liquid storage tube 21 when the liquid outlet block 22 retracts to form a sealed connection between the positioning tube 1 and the workpiece 3. Moreover, due to the close contact between the second connecting end 102 and the outer surface of the workpiece 3 to be processed, the liquid in the liquid sealing film can fill the tiny depressions on the surface of the workpiece 3 to be processed. This can increase the sealing performance of the positioning tube 1 during adsorption without lubricating the second connecting end 102 and the surface of the workpiece 3, thus effectively ensuring the stability of the adsorption connection between the second connecting end 102 and the workpiece 3 to be processed.

[0058] Another object of the present invention is to provide a processing apparatus, including a workpiece positioning fixture as described above.

[0059] Compared with the prior art, the processing equipment in this invention has all the advantages of the above-mentioned workpiece positioning fixture, which will not be elaborated here.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning fixture for a workpiece, characterized in that, It includes a positioning tube (1) and a liquid seal assembly (2) corresponding to the positioning tube (1). The positioning tube (1) has a first connecting end (101) and a second connecting end (102) located at both ends of its own axial direction. The first connecting end (101) is connected to a negative pressure pipeline, and the second connecting end (102) is used to adsorb the workpiece (3) to be processed. The liquid sealing assembly (2) includes a plurality of liquid storage tubes (21) and a liquid outlet block (22) corresponding to each of the liquid storage tubes (21). There are a plurality of liquid storage tubes (21), and the plurality of liquid storage tubes (21) are evenly arranged around the axis of the positioning tube (1). The axis of each liquid storage tube (21) is parallel to the axis of the positioning tube (1), and each is embedded in the tube wall of the positioning tube (1). The end face of the second connecting end (102) is provided with a mounting hole (103) for installing the liquid storage tube (21), and the axis of each mounting hole (103) is parallel to the axis of the positioning tube (1). The end face of the liquid outlet (201) of the liquid storage tube (21) is flush with the end face of the second connecting end (102). The liquid outlet block (22) is elastically connected to the liquid storage tube (21), and the elastic movement direction of the liquid outlet block (22) is parallel to the axis of the liquid storage tube (21). The inner diameter of the liquid outlet (201) is smaller than the diameter of the liquid outlet block (22). In the free state, the liquid outlet block (22) seals against the inner wall of the liquid outlet (201) and protrudes from the liquid outlet (201).

2. The workpiece positioning fixture as described in claim 1, characterized in that, The liquid sealing assembly (2) further includes a support spring (23) disposed in the liquid storage tube (21), the elastic extension direction of the support spring (23) being parallel to the axis of the liquid storage tube (21); a first snap ring (202) coaxial with the liquid storage tube (21) is formed on the inner wall of the liquid storage tube (21), the two ends of the support spring (23) abut against the liquid outlet block (22) and the first snap ring (202) respectively, and the support spring (23) is configured to have a preload force that causes the liquid outlet block (22) to seal against the inner wall of the liquid outlet (201).

3. The workpiece positioning fixture as described in claim 2, characterized in that, The liquid outlet block (22) is a spherical component, and the liquid outlet block (22) is rotatably located between the liquid outlet (201) and the support spring (23).

4. The workpiece positioning fixture as described in claim 3, characterized in that, The liquid seal assembly (2) further includes a support shaft (24) coaxially disposed in the liquid storage tube (21). Along the axial direction of the positioning tube (1), the distance between the end of the support shaft (24) near the liquid outlet (201) and the end face of the liquid outlet (201) is equal to the diameter of the liquid outlet block (22). The support spring (23) is sleeved on the outer wall of the support shaft (24).

5. The workpiece positioning fixture as described in claim 1, characterized in that, The positioning fixture for the workpiece includes at least two positioning tubes (1) with mutually perpendicular axes, and two liquid seal assemblies (2) corresponding one-to-one with the two positioning tubes (1).

6. The workpiece positioning fixture as described in claim 1, characterized in that, The positioning tube (1) is fitted with a buffer sleeve (11) on the outer wall adjacent to the second connecting end (102). The buffer sleeve (11) has a buffer end protruding from the end face of the second connecting end (102). The inner diameter of the buffer end is not less than the outer diameter of the second connecting end (102).

7. The workpiece positioning fixture as described in claim 1, characterized in that, The mounting hole (103) is a blind hole. A magnet (25) is sealed to one end of the liquid storage tube (21) away from the liquid outlet (201). The magnet (25) can be magnetically matched with the bottom end of the mounting hole (103).

8. The workpiece positioning fixture as described in claim 2, characterized in that, The liquid seal assembly (2) further includes a limiting shaft (26) disposed in the liquid storage tube (21). One end of the limiting shaft (26) is fixedly connected to the liquid outlet block (22), and the other end is formed with a second snap ring (261). The second snap ring (261) is located on the side of the first snap ring (202) away from the liquid outlet (201). Corresponding to the second snap ring (261), an annular groove (203) is coaxially formed on the inner wall of the liquid storage tube (21), and the second snap ring (261) is coaxially snapped into the annular groove (203).

9. The workpiece positioning fixture as described in claim 1, characterized in that, The mounting hole (103) is a through hole and has a first opening located at the second connecting end (102) and a second opening located on the outer wall of the positioning tube (1). The end of the liquid storage tube (21) away from the liquid outlet (201) is connected to the outside through the second opening, and the liquid storage tube (21) is provided with anti-leakage wax (28) to prevent leakage of internal sealing liquid.

10. A processing device, characterized in that, The positioning fixture includes the workpiece as described in any one of claims 1 to 9.

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