Null positioning device

Abstract

The embodiment of the application provides a zero point positioning device, which comprises a base assembly, a ball and a pull rod shaft assembly. The base assembly comprises a first positioning base and a second positioning base connected with the first positioning base, and a first cavity is formed between the first positioning base and the second positioning base. The ball is movably arranged in the first cavity. The pull rod shaft assembly is partially inserted into the first cavity, and the pull rod shaft assembly comprises a positioning structure and a locking structure movably arranged in the positioning structure. The positioning structure comprises a flexible section, and the flexible section is provided with a positioning surface matched with the ball. The locking structure comprises a locking pull rod, and one end of the locking pull rod is provided with a locking portion matched with the flexible section. The device is used to achieve the effect that the zero point positioning device can be locked and unlocked without using a pneumatic or hydraulic power source.

Description

Technical Field

[0001] This application relates to the field of machining positioning technology, and in particular to a zero-point positioning device. Background Technology

[0002] In machining, the positioning accuracy of the workpiece directly affects the machining quality and efficiency, especially in scenarios with multiple process switching and high precision requirements, such as tooling fixture positioning on CNC machine tools, modular assembly on automated production lines, and precision alignment of aerospace components. The core function of a zero-point positioning device is to ensure that the workpiece accurately returns to the same reference point each time it is installed through rapid and repetitive positioning operations, thereby avoiding machining errors caused by positioning deviations.

[0003] Existing zero-point positioning devices are usually positioning mechanisms driven by pneumatic or hydraulic pressure. They control the change of air pressure in the cavity through air valves to drive the positioning pin or clamping slider to complete the positioning and locking operations.

[0004] For example, patent document CN118404365A discloses a zero-point positioner, which is commonly used in machine tool machining. During use, the air valve needs to be pressurized in a timely manner to maintain the positioning and locking stability of the workpiece. When the product is finished or needs to be replaced, the gas in the air valve needs to be discharged sequentially. A continuous air source or other power source is required during the locking process, and it cannot be used in scenarios without a power source. In addition, during long-term use, its positioning and locking stability depends on the air chamber sealing ring, and its wear will directly affect the positioning and locking effect. Summary of the Invention

[0005] This application provides a zero-point positioning device to achieve locking and unlocking of the zero-point positioning device regardless of whether it is powered by pneumatic or hydraulic means.

[0006] This application provides a zero-point positioning device, including:

[0007] The base assembly includes a first positioning base and a second positioning base connected to the first positioning base, with a first cavity formed between the first positioning base and the second positioning base;

[0008] The ball bearing is movable within the first cavity;

[0009] A pull rod shaft assembly is partially inserted into a first cavity. The pull rod shaft assembly includes a positioning structure and a locking structure movable within the positioning structure. The positioning structure includes a flexible section with a positioning surface that mates with a ball bearing.

[0010] The locking structure includes a locking rod, one end of which has a locking part that engages with a flexible section. The locking part is configured to drive the flexible section to deform during movement to lock or unlock the ball and the positioning surface, so that the rod shaft assembly and the base assembly are in a locked or unlocked state.

[0011] In one possible implementation, the positioning surface is a concave surface facing the inward recess of the locking lever.

[0012] In one possible implementation, the flexible section has a conical surface that mates with the locking part.

[0013] In one possible implementation, a strip-shaped slit is provided on the flexible segment, with one end of the strip-shaped slit extending to the bottom end of the flexible segment.

[0014] In one possible implementation, the positioning structure further includes a positioning segment, one end of which is connected to the flexible segment, and the positioning segment has a first Z-direction positioning surface, which faces the first positioning base and is positioned and engaged with the first positioning base.

[0015] In one possible implementation, the locking lever has a variable diameter section, with the locking part located in the variable diameter section.

[0016] In one possible implementation, the locking structure further includes an operating lever, which is threadedly connected to a locking pull rod, and the operating lever is bearing-connected to a positioning structure, while the locking pull rod is slidably connected to the positioning structure.

[0017] In one possible implementation, it also includes:

[0018] The third positioning base is movably disposed in the first cavity. One side of the third positioning base is elastically connected to the second positioning base through an elastic component, and the other side abuts against the ball bearing.

[0019] In one possible implementation, it further includes: a first connecting component, one end of which is connected to the third positioning base, and the first connecting component is used to drive the third positioning base to move in order to lock or release the ball.

[0020] In one possible implementation, the third positioning base forms a sealed second cavity with the first positioning base and the second positioning base. The second cavity is used to communicate with an external air source so that the third positioning base can move under the drive of the external air source.

[0021] In one possible implementation, the first positioning base has a channel, one end of which communicates with the second cavity, and the other end of which is connected to a pneumatic connector.

[0022] In one possible implementation, it further includes: a positioning sensor disposed on a second positioning base, one end of the positioning sensor extending toward the first cavity and corresponding to the end of the pull rod shaft assembly.

[0023] The zero-point positioning device provided in this application embodiment has a movable locking structure within the positioning structure, and the positioning structure includes a flexible segment. The locking structure has a locking part that cooperates with the flexible segment. During movement, the locking part drives the flexible segment to deform, thereby locking or unlocking the ball bearing with the positioning surface of the flexible segment, thus placing the pull rod shaft assembly and the base assembly in a locked or unlocked state. This achieves the effect that the zero-point positioning device can be in a locked or unlocked state under mechanical action. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 A schematic diagram of the zero-point positioning device provided in this application;

[0026] Figure 2 A schematic diagram of the structure of the base assembly provided in this application;

[0027] Figure 3 A schematic diagram of the positioning structure provided in this application;

[0028] Figure 4 A structural schematic diagram of the positioning structure provided in this application from another perspective;

[0029] Figure 5 A cross-sectional view of the tie rod shaft assembly just inserted into the base assembly provided in this application;

[0030] Figure 6 A cross-sectional structural diagram showing the locked state of the zero-point positioning device provided in this application;

[0031] Figure 7 A cross-sectional structural diagram showing the unlocked state of the zero-point positioning device provided in this application;

[0032] Figure 8 A cross-sectional structural schematic diagram of the zero-point positioning device with a dual mechanical structure provided in this application;

[0033] Figure 9 A cross-sectional structural schematic diagram of the zero-point positioning device of the mechanical-pneumatic structure provided in this application. Figure Labels

[0034] 1. Pull rod shaft assembly; 11. Positioning structure; 111. Positioning section; 1111. First Z-direction positioning surface; 112. Flexible section; 1121. Strip-shaped gap; 1122. Positioning surface; 1123. Conical surface; 12. Locking structure; 121. Operating rod; 122. Locking pull rod; 123. Locking cone; 2. Base assembly; 21. First positioning base; 211. Second Z-direction positioning surface; 212. Second connecting assembly; 22. Second positioning base; 221. First connecting assembly; 23. Third positioning base; 3. Pneumatic connector; 4. Positioning sensor; 5. Ball bearing; 6. Elastic component; 7. Sealing assembly; 71. First seal; 72. Second seal; 73. Third seal; 8. First cavity; 81. Second cavity; 9. Connecting hole.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0037] like Figure 1 As shown, the zero-point positioning device structure of this application includes a base assembly 2 and a pull rod shaft assembly 1.

[0038] In existing technologies, zero-point positioners require pneumatic or hydraulic power to lock or unlock, which presents a technical problem that the zero-point positioner cannot be used in environments without pneumatic or hydraulic power.

[0039] The zero-point positioning device provided in this application solves the technical problem that the zero-point positioner cannot be used in environments without pneumatic or hydraulic power sources by setting a movable locking structure 12 in the positioning structure 11, and the positioning structure 11 is provided with a flexible section 112, and the locking structure 12 is provided with a locking part that cooperates with the flexible section 112. During the movement of the locking part, the flexible section 112 will be deformed, thereby locking or unlocking the ball 5 and the positioning surface 1122 of the flexible section 112, so that the pull rod shaft assembly 1 and the base assembly 2 are in a locked or unlocked state.

[0040] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0041] like Figure 1 , Figure 2 , Figure 5-8 The diagram shows a zero-point positioning device, which includes a base assembly 2, a ball bearing 5, and a pull rod shaft assembly 1.

[0042] The base assembly 2 includes a first positioning base 21 and a second positioning base 22 connected to the first positioning base 21, and a first cavity 8 is formed between the first positioning base 21 and the second positioning base 22.

[0043] Ball bearing 5 is movable within the first cavity 8;

[0044] A pull rod shaft assembly 1 is partially inserted into a first cavity 8. The pull rod shaft assembly 1 includes a positioning structure 11 and a locking structure 12 that is movable within the positioning structure 11. The positioning structure 11 includes a flexible section 112, on which a positioning surface 1122 that cooperates with the ball bearing 5 is provided.

[0045] The locking structure 12 includes a locking rod 122, one end of which has a locking part that cooperates with the flexible section 112. The locking part is configured to drive the flexible section 112 to deform during movement to lock or unlock the ball 5 with the positioning surface 1122, so that the rod shaft assembly 1 and the base assembly 2 are in a locked or unlocked state.

[0046] Specifically, such as Figure 1-2 , Figure 5 As shown, the zero-point positioning device includes a base assembly 2, ball bearings 5, and a pull rod shaft assembly 1. The base assembly 2 includes a first positioning base 21 and a second positioning base 22. The first positioning base 21 and the second positioning base 22 can be connected via a second connecting assembly 212. Figure 2 and Figure 5 As shown, the first positioning base 21 and the second positioning base 22 are connected by a second connecting component 212. The second connecting component 212 can be a threaded component or a pin component, as long as it can achieve a stable connection between the first positioning base 21 and the second positioning base 22. Figure 2 In the embodiment shown, the second connecting component 212 is a threaded component, with multiple sets of threads evenly distributed circumferentially on the first positioning base 21 and the second positioning base 22 for connection, making the overall structure of the base component 2 more stable and enabling better positioning and processing of the workpiece.

[0047] like Figure 2 and Figure 5 As shown, the first positioning base 21 is located above the second positioning base 22. After the first positioning base 21 and the second positioning base 22 are connected, a first cavity 8 is formed. Corresponding arc-shaped grooves are respectively opened at corresponding positions of the first positioning base 21 and the second positioning base 22. The two sets of opposing arc-shaped grooves form a groove, in which several ball bearings 5 ​​are placed. The ball bearings 5 ​​can move freely in the groove. When the pull rod shaft assembly 1 and the base assembly 2 are in the unlocked state, as shown... Figure 7 As shown, or when the base assembly 2 is not installed within the base assembly 2, as Figure 2 As shown, ball 5 is in a free state; when the tie rod assembly 1 and base assembly 2 are in a locked state, as Figure 6 As shown, ball 5 is in a locked state.

[0048] The pull rod shaft assembly 1 includes a positioning structure 11 and a locking structure 12. The locking structure 12 is connected to the positioning structure 11 and is located inside the positioning structure 11 and can move within the positioning structure 11. The positioning structure 11 is provided with a flexible segment 112, which is inserted into the first cavity 8. The outer surface of the flexible segment 112 is provided with a positioning surface 1122. The structure of the positioning surface 1122 cooperates with the structure of the ball 5 to make the relative movement between the flexible segment 112 and the ball 5 smoother and to better lock the ball 5.

[0049] It should be noted that the flexible segment 112 is made of a material that can produce elastic deformation. The specific material only needs to be one that will not break when deformed. It can be a metal with flexible deformation or a plastic material with plastic deformation, etc. There are no restrictions here.

[0050] The locking structure 12 includes a locking lever 122, such as Figure 6 As shown, the locking part structure at the bottom end of the locking rod 122 cooperates with the structure of the flexible section 112. During the movement of the locking structure 12, when the locking part moves closer to or away from the flexible section 112, it drives the flexible section 112 to deform. During the movement, when the locking part moves closer to the flexible section 112, it compresses the flexible section 112, causing the outer diameter of the flexible section 112 to increase; when the locking part moves away from the flexible section 112, it reduces the compression on the flexible section 112, causing the outer diameter of the flexible section 112 to decrease. During the increase or decrease of the outer diameter of the flexible section 112, the ball bearing 5 is locked or unlocked by the positioning surface 1122, thereby causing the rod shaft assembly 1 and the base assembly 2 to be in a locked or unlocked state.

[0051] The zero-point positioning device provided in this application can lock and unlock the tie rod shaft assembly 1 in the base assembly 2 with only mechanical operation, solving the problem that traditional technologies require a pneumatic or hydraulic power source to operate. While achieving precise positioning, it also improves the versatility of the zero-point positioning device, allowing it to perform positioning operations independently and making it suitable for various working conditions.

[0052] Furthermore, the positioning surface 1122 is a concave surface that faces the locking lever 122.

[0053] Specifically, such as Figure 3 and Figure 4 As shown, the positioning surface 1122 is the outer surface of the flexible section 112. The positioning surface 1122 has a concave structure. Specifically, the positioning surface 1122 is a concave surface formed by being recessed in the direction of the locking lever 122. This concave surface matches the structure of the ball 5. When the ball 5 is locked by the positioning surface 1122, the concave surface can better lock the ball 5.

[0054] Furthermore, the flexible section 112 is provided with a conical surface 1123 that mates with the locking part.

[0055] like Figure 3 and Figure 4 As shown, the inner surface of the flexible segment 112 is provided with a conical surface 1123. The structure of the conical surface 1123 matches the structure of the locking part, so that when the locking part moves with the locking structure 12, it can move closer to or away from the flexible segment 112 more smoothly.

[0056] Furthermore, the flexible segment 112 is provided with a strip-shaped slit 1121, one end of which extends to the bottom end of the flexible segment 112.

[0057] like Figure 3 and Figure 4 As shown, in order to improve the deformation capability of the flexible segment 112, a strip-shaped slit 1121 is opened on the flexible segment 112, which is more conducive to the deformation of the flexible segment 112. That is, the increase and decrease of the outer diameter of the flexible segment 112 is mainly achieved through the structure of the flexible segment 112, which reduces the material loss caused by deformation.

[0058] Specifically, such as Figure 3 As shown, the structure of the strip-shaped slit 1121 extends from one end of the flexible segment 112 to the edge of the bottom end so that the flexible segment 112 can be better stretched.

[0059] Furthermore, the positioning structure 11 also includes a positioning segment 111, one end of which is connected to the flexible segment 112, and the positioning segment 111 has a first Z-direction positioning surface 1111, which faces the first positioning base 21 and is positioned and engaged with the first positioning base 21.

[0060] The positioning structure 11 includes a positioning segment 111, which is connected to a flexible segment 112. This connection can be a fixed connection, which can be integrally formed, welded, bolted, or otherwise. An integrally formed structure is preferred due to its better stability. The positioning segment 111 can be used to connect with external structural components, such as tooling, fixtures, or other positioning and processing equipment, which can be selected according to actual working conditions. The positioning segment 111 can also be used for a stable connection with the first positioning base 21, such as... Figure 2 and Figure 4 As shown, the positioning segment 111 is provided with a first Z-direction positioning surface 1111, and the first positioning base 21 is provided with a second Z-direction positioning surface 211. When the tie rod shaft assembly 1 is installed in the base assembly 2, the first Z-direction positioning surface 1111 and the second Z-direction positioning surface 211 are completely fitted together to form Z-direction positioning, that is, horizontal positioning.

[0061] It should be noted that part of the structure of the positioning segment 111 needs to be inserted into the base assembly. The outer diameter of the part of the positioning segment 111 that needs to be inserted into the base assembly 2 matches the inner diameter of the connecting hole 9 opened in the first positioning base 21, so as to better achieve positioning and assembly.

[0062] Furthermore, the locking lever 122 has a variable diameter section, and the locking part is located in the variable diameter section.

[0063] like Figure 5 As shown, the locking rod 122 has a variable diameter section, which can be a conical structure. Specifically, the variable diameter section of the locking rod 122 protrudes from the other sections. When the locking rod 122 is connected to the flexible section 112, the flexible section 112 wraps around the outside of the locking rod 122. Figure 3 , Figure 4 and Figure 7 As shown, the variable diameter section of the locking rod 122 is configured as a locking cone 123 structure, and the inner surface of the flexible section 112 is configured as a conical surface 1123 so that the conical surface 1123 of the flexible section 112 can better wrap around the locking cone 123. In this embodiment, the locking part is the most protruding part of the locking cone 123.

[0064] It should be noted that during the movement of the locking structure, when the flexible segment 112 wraps around the variable diameter segment, the flexible segment 112 will be stretched larger in the radial direction due to deformation. When the flexible segment 112 wraps around other segments, the flexible segment 112 will become smaller in the radial direction due to deformation.

[0065] Furthermore, the locking structure 12 also includes an operating rod 121, which is threadedly connected to the locking lever 122. The operating rod 121 is also bearing-connected to the positioning structure 11, and the locking lever 122 is slidably connected to the positioning structure 11.

[0066] Specifically, the locking structure 12 comprises two parts: an operating lever 121 and a locking pull rod 122. One embodiment of the connection method between the operating lever 121 and the locking pull rod 122 is a threaded connection between them. Figure 5 As shown, the operating lever 121 is bearing-connected to the positioning section 111, and the locking lever 122 is slidably connected to the positioning structure 11. Under the action of external force, when the operating lever 121 drives the locking lever 122 to rotate, the positioning section 111 does not rotate accordingly. The rotation of the operating lever 121 causes the locking lever 122 to move closer to or away from the operating lever 121. The slidable connection between the locking lever 122 and the positioning structure 11 makes this movement smoother, thereby further driving the variable diameter section of the locking lever 122 to move closer to or away from the flexible section 112, thus realizing the locking and unlocking of the lever shaft assembly 1 in the base assembly 2.

[0067] Under the action of external force, the operating rod 121 can drive the locking rod 122 to move axially relative to each other, thereby realizing the relative movement between the locking structure 12 and the positioning structure 11.

[0068] When the locking rod 122 and the flexible section 112 move axially relative to each other, the flexible section 112 may wrap around other sections of the locking rod 122 or around the variable diameter section of the locking rod 122. When the flexible section 112 wraps around the variable diameter section, the flexible section 112 will be stretched larger in the radial direction due to deformation. When the flexible section 112 wraps around other sections, the flexible section 112 will become smaller in the radial direction due to deformation.

[0069] The tie rod shaft assembly 1 is inserted into the base assembly 2 through the connecting hole 9, such as... Figure 5 As shown, the flexible section 112, just inserted into the base assembly 2, gently abuts against the ball 5. Under external force, the operating rod 121 drives the locking rod 122 to move closer to the operating rod 121. The variable diameter section of the locking rod 122 moves closer to the flexible section 112, causing the outer diameter of the flexible section 112 to gradually increase and move closer to the ball 5, ultimately locking the ball 5 stably and achieving the locking state of the rod shaft assembly 1 in the base assembly 2. Figure 6 As shown, at this time, the ball 5 is squeezed and abutted by the first positioning base 21, the second positioning base 22, the third positioning base 23, and the flexible section 112, forming a stable limit.

[0070] After the structural components are machined, under the action of external force, the operating lever 121 drives the locking lever 122 to move away from the operating lever 121, thereby moving the variable diameter section of the locking lever 122 away from the flexible section 112. A gap is created between the flexible section 112 and the locking lever 122. Under the force of the ball bearing 5, the flexible section 112 undergoes radial deformation, and its outer diameter decreases, causing the lever shaft assembly 1 to be in the unlocked state. Figure 7 As shown, in the unlocked state, the pull rod shaft assembly 1 can be pulled out from the base assembly 2.

[0071] Furthermore, the zero-point positioning device also includes a third positioning base 23, which is movably disposed in the first cavity 8. One side of the third positioning base 23 is elastically connected to the second positioning base 22 through an elastic component 6, and the other side abuts against the ball bearing 5.

[0072] A third positioning base 23 is disposed within the first cavity 8, located between the first positioning base 21 and the second positioning base 22. Specifically, one bottom side of the third positioning base 23 is elastically connected to the second positioning base 22 via an elastic component 6, allowing the third positioning base 23 to move relative to the second positioning base 22 under the elastic action of the elastic component 6. It should be noted that the structure of the third positioning base 23 is compatible with the structures of the first positioning base 21 and the second positioning base 22. The other side of the third positioning base 23 abuts against the ball bearing 5, as shown... Figure 5 As shown, the position of the ball 5 is defined by the groove and the point of the third positioning base 23. The area where the third positioning base 23 abuts against the ball 5 can be set to be arc-shaped so that the relative movement of the third positioning base 23 and the ball 5 is smoother, and the contact with the ball 5 is more closely fitted.

[0073] The elastic component 6 can be a spring component, a disc spring component, etc., as long as it can provide strong elastic energy storage. A disc spring component is preferred, as disc spring components have strong load-bearing capacity and deformation capacity. Figure 5 As shown, the disc spring is circumferentially distributed between the third positioning base 23 and the second positioning base 22, providing energy and deformation for the movement of the third positioning base 23.

[0074] The third positioning base 23 can be slidably connected to the first positioning base 21 and the second positioning base 22. Specifically, for example... Figure 5 As shown, the third positioning base 23 is slidably connected to the first positioning base 21 and the second positioning base 22, so that the third positioning base 23 can move more smoothly in the first cavity 8, and can adjust its position more smoothly when the pull rod shaft assembly 1 is locked and unlocked in the base assembly 2.

[0075] Furthermore, the zero-point positioning device also includes a first connecting component 221, one end of which is connected to the third positioning base 23, and the first connecting component 221 is used to drive the third positioning base 23 to move in order to lock or release the ball 5.

[0076] To facilitate smoother unlocking of the zero-point positioning device, a first connecting component 221 is added to the connection between the first positioning base 21 or the second positioning base 22 and the third positioning base 23. Specifically, in addition to the initial contact between the first positioning base 21 and the third positioning base 23, the first connecting component 221 is added axially to further define the position of the third positioning base 23; or, in addition to the elastic connection between the second positioning base 22 and the third positioning base 23, the first connecting component 221 is added axially to further define the position of the third positioning base 23. Either method is acceptable; any connection method that achieves the specific position definition of the third positioning base 23 is acceptable.

[0077] The first connecting component 221 can be a threaded component. For example, a set screw or pull rod can be provided on the first positioning base 21 or the second positioning base 22 and fixedly connected to the third positioning base 23. The set screw or pull rod drives the third positioning base 23 to move, thereby locking or releasing the ball 5, and thus realizing the positioning, locking, unlocking and separation of the pull rod shaft assembly 1 and the base assembly 2. Figure 8 In the embodiment shown, a pull rod screw is provided on the second positioning base 22 to connect with the third positioning base 23, and the unlocking operation can be completed directly through the pull rod screw.

[0078] It should be noted that in this embodiment, the locking and unlocking of the pull rod shaft assembly 1 in the base assembly 2 is achieved through the cooperation of the positioning structure 11 and the first connecting component 221, which can complete the operation more conveniently and efficiently, without the need for pneumatic or hydraulic power sources, and without the need to consider the design of a sealed cavity.

[0079] Furthermore, the third positioning base 23 forms a sealed second cavity 81 with the first positioning base 21 and the second positioning base 22. The second cavity 81 is used to communicate with an external air source so that the third positioning base 23 can move under the drive of the external air source.

[0080] Specifically, one embodiment of the zero-point positioning device is equipped with a pneumatic power source that combines mechanical and pneumatic operation. An external air source is connected to a sealed second cavity 81 formed by the first positioning base 21 and the third positioning base 23.

[0081] Specifically, a sealing assembly 7 is provided between the first positioning base 21, the second positioning base 22, and the third positioning base 23 to form a second cavity 81.

[0082] To form a sealed second cavity 81, the third positioning base 23 needs to be sealed with the first positioning base 21 and the second positioning base 22. Specifically, a sealing assembly 7 is provided between the first positioning base 21, the second positioning base 22, and the third positioning base 23. The sealing assembly 7 can be any sealing component capable of sealing the second cavity 81. Figure 5 In the embodiment shown, a first sealing element 71 is provided between the first positioning base 21 and the second positioning base 22, a second sealing element 72 is provided between the second positioning base 22 and the third positioning base 23, and a third sealing element 73 is provided between the first positioning base 21 and the third positioning base 23. The sealing element can be a sealing ring.

[0083] By supplying external air to the sealed second cavity 81, the movement of the third positioning base 23 can be controlled, thereby further controlling the locking and unlocking of the tie rod shaft assembly 1 in the base assembly 2.

[0084] This embodiment is applicable to situations with a pneumatic power source. In application environments with a pneumatic power source, combined with the structure of the pull rod shaft assembly 1, the locking and unlocking of the zero-point positioning device can be further guaranteed, and the operating efficiency of the zero-point positioning device can be improved.

[0085] Furthermore, the first positioning base 21 has a channel, one end of which is connected to the second cavity 81, and the other end of which is connected to a pneumatic connector 3.

[0086] Specifically, such as Figure 9 As shown, a channel is provided in the first positioning base 21, the channel connecting the second cavity 81 and the pneumatic connector 3. Figure 9 In the illustrated embodiment, the pneumatic connector 3 is disposed on the first positioning base 21. The pneumatic connector 3 communicates with a sealed second cavity 81 formed by the first positioning base 21, the second positioning base 22, and the third positioning base 23 via a channel to deliver gas into the second cavity 81. The third positioning base 23 moves according to the pressure difference between the pressure within the second cavity 81 and the elastic force of the elastic component 6. When the pressure within the second cavity 81 is less than the elastic force provided by the elastic component 6, the third positioning base 23 compresses the ball bearing 5; when the pressure within the second cavity 81 is greater than the elastic force provided by the elastic component 6, the third positioning base 23 releases the ball bearing 5. This embodiment further limits the ball bearing 5 by controlling the position of the third positioning base 23, and combined with the structure of the positioning structure 11 and the locking structure 12, thereby achieving the locking and unlocking of the pull rod shaft assembly 1 within the base assembly 2.

[0087] It should be noted that the pneumatic connector 3 can be replaced with a hydraulic power connector, which uses a hydraulic power source to supply hydraulic pressure to the second cavity 81 to increase or decrease pressure. The principle is the same as that of the pneumatic power source, and will not be elaborated here.

[0088] Furthermore, it also includes: a positioning sensor 4, which is disposed on the second positioning base 22, with one end of the positioning sensor 4 extending toward the first cavity 8 and corresponding to the end of the pull rod shaft assembly 1.

[0089] like Figure 5-9As shown, to further detect the precise positioning of the pull rod shaft assembly 1, a positioning sensor 4 is also installed on the second positioning base 22 to detect the positioning and locking state of the pull rod shaft assembly 1 in a timely manner. Specifically, the positioning sensor 4 is located on the second positioning base 22, with one end of the positioning sensor 4 extending towards the first cavity 8 and corresponding to the end of the pull rod shaft assembly 1, that is, directly below the locking structure 12. The positioning sensor 4 only needs to be able to detect the precise positioning of the locking structure 12, and is preferably a capacitive sensor. Capacitive sensors have high sensitivity, fast dynamic response, and simple structure.

[0090] The zero-point positioning device provided in this application adopts multiple schemes such as mechanical positioning and unlocking, dual mechanical positioning and unlocking, and positioning and unlocking combining mechanical and pneumatic methods to realize the positioning and unlocking of the zero-point positioning device. The specific positioning, locking and unlocking separation process is described below.

[0091] The mechanical positioning and unlocking process is as follows:

[0092] Positioning and locking: Loosen the operating rod 121 in the pull rod shaft assembly 1 to separate the locking pull rod 122 from the inner conical surface 1123 of the flexible section 112, creating a certain gap; insert the pull rod shaft assembly 1 into the base assembly 2, and the flexible section 112 undergoes radial deformation under the force of the ball 5, thus allowing for smooth insertion; tighten the locking pull rod 122 in the pull rod shaft assembly 1 to make it tensile with the inner conical surface of the flexible section 112; during the tightening process of the locking pull rod 122, the flexible section 112 automatically aligns under the action of the ball 5, and the first Z-direction positioning surface 1111 of the pull rod shaft assembly 1 and the second Z-direction positioning surface 211 of the base assembly 2 are tightly fitted to complete positioning and locking; the positioning status is confirmed by the signal of the positioning sensor 4.

[0093] Unlocking and separation: Loosen the locking rod 122 in the pull rod shaft assembly 1 to separate it from the inner conical surface of the flexible section 112, creating a certain gap; pull the pull rod shaft assembly 1 out from the base assembly 2, and the flexible section 112 undergoes radial deformation under the force of the ball 5, thus being pulled out smoothly.

[0094] It should be noted that in the dual mechanical positioning and unlocking scheme, the position of the third positioning base 23 is adjusted by the first connecting component 221 on the first positioning base 21 or the second positioning base 22, thereby further locking or unlocking the pull rod shaft assembly 1.

[0095] The process of the mechanical-pneumatic positioning and unlocking scheme is as follows:

[0096] Positioning and locking: Connect the pneumatic connector 3 to the air source to inflate the second cavity 81. Once the set air pressure is reached, the air source is cut off. The elastic component 6 is compressed under the air pressure, and the ball bearing 5 is in a free state within the base assembly 2. Tighten the locking rod 122 in the pull rod shaft assembly 1 and insert it into the base assembly 2. Depress the second cavity 81 through the pneumatic connector 3. The elastic component 6 then pushes the third positioning base 23 upward, thereby pushing the ball bearing 5 to the pull rod shaft assembly 1. The flexible section 112 of the positioning structure 11 automatically centers under the action of the ball bearing 5, and the first Z-direction positioning surface 1111 of the pull rod shaft assembly 1 and the second Z-direction positioning surface 211 of the base assembly 2 are tightly fitted to complete the positioning and locking. The positioning status is confirmed by the signal from the positioning sensor 4.

[0097] Unlocking and separation: Connect the pneumatic connector 3 to the air source for inflation. Once the set air pressure is reached, the air source can be cut off. The elastic component 6 is compressed under the air pressure, and the ball bearing 5 is in a free state within the base assembly 2. Pull the pull rod shaft assembly 1 out of the base assembly 2.

[0098] The zero-point positioning device provided in this application can be applied to situations with or without a pneumatic power source, making it more versatile. Multiple solutions are available for selection based on actual working conditions, making it highly applicable. The structure is also relatively simple and easy to operate.

[0099] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A zero positioning device, characterized in that, include: The base assembly (2) includes a first positioning base (21) and a second positioning base (22) connected to the first positioning base (21), wherein a first cavity (8) is formed between the first positioning base (21) and the second positioning base (22); Ball bearing (5), which is movably disposed within the first cavity (8); A pull rod shaft assembly (1) is partially inserted into the first cavity (8). The pull rod shaft assembly (1) includes a positioning structure (11) and a locking structure (12) movable within the positioning structure (11). The positioning structure (11) includes a flexible section (112) and a positioning surface (1122) that cooperates with the ball (5). The locking structure (12) includes a locking rod (122), one end of which has a locking part that engages with the flexible segment (112). The locking part is configured to drive the flexible segment (112) to deform during movement to lock or unlock the ball (5) and the positioning surface (1122), so that the rod shaft assembly (1) and the base assembly (2) are in a locked or unlocked state.

2. The zero-point positioning device according to claim 1, characterized in that, The positioning surface (1122) is a concave surface that faces inward toward the locking lever (122).

3. The zero-point positioning device according to claim 1, characterized in that, The flexible section (112) has a conical surface (1123) that cooperates with the locking part.

4. The zero-point positioning device according to claim 1, characterized in that, The flexible segment (112) is provided with a strip-shaped slit (1121), one end of which extends to the bottom end of the flexible segment (112).

5. The zero-point positioning device according to claim 1, characterized in that, The positioning structure (11) further includes a positioning segment (111), one end of which is connected to the flexible segment (112), and the positioning segment (111) has a first Z-direction positioning surface (1111), which faces the first positioning base (21) and is positioned and cooperates with the first positioning base (21).

6. The zero-point positioning device according to claim 1, characterized in that, The locking lever (122) has a variable diameter section, and the locking part is located in the variable diameter section.

7. The zero-point positioning device according to claim 1, characterized in that, The locking structure (12) also includes an operating rod (121), which is threadedly connected to the locking lever (122), and the operating rod (121) is bearing-connected to the positioning structure (11). The locking lever (122) is slidably connected to the positioning structure (11).

8. The zero-point positioning device according to claim 1, characterized in that, Also includes: The third positioning base (23) is movably disposed in the first cavity (8). One side of the third positioning base (23) is elastically connected to the second positioning base (22) through an elastic component (6), and the other side abuts against the ball (5).

9. The zero-point positioning device according to claim 8, characterized in that, Also includes: The first connecting component (221) is connected at one end to the third positioning base (23), and the first connecting component (221) is used to drive the third positioning base (23) to move in order to lock or release the ball (5).

10. The zero-point positioning device according to claim 8, characterized in that, The third positioning base (23) forms a sealed second cavity (81) with the first positioning base (21) and the second positioning base (22). The second cavity (81) is used to communicate with an external air source so that the third positioning base (23) can move under the drive of the external air source.

11. The zero-point positioning device according to claim 10, characterized in that, The first positioning base (21) has a channel, one end of which is connected to the second cavity (81), and the other end of which is connected to a pneumatic connector (3).

12. The zero-point positioning device according to claim 1, characterized in that, Also includes: Positioning sensor (4) is provided on the second positioning base (22), and one end of the positioning sensor (4) extends toward the first cavity (8) and corresponds to the end of the pull rod shaft assembly (1).

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