A zero positioning device

Abstract

The application discloses a zero positioning device, comprising: a positioning seat, which is provided with a positioning hole and a piston mounting space; a clamping assembly, which has at least three and is arranged along the circumference of the positioning hole; a rotating seat, which is configured to synchronously drive the clamping assembly to move; and a piston, which is movably arranged in the piston mounting space and is configured to drive the rotating seat to rotate, so that the three clamping assemblies synchronously move along the radial direction of the positioning hole; wherein a fluid containing cavity is formed between the piston and the piston mounting space, and the fluid containing cavity is in communication with the outside; when the fluid containing cavity is in a first state or a second state, the three clamping assemblies synchronously move away from or close to the center of the positioning hole. The clamping assembly replaces the traditional steel ball locking puller, effectively prevents the mechanism from being jammed by metal chips, and provides stable holding force for the puller due to the large contact area formed by the clamping assembly.

Description

Technical Field

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

[0002] In the field of traditional parts processing, zero-point positioning system is an important means to improve production efficiency. Most traditional zero-point positioning systems use ball bearings to lock the rivets. For example, a zero-point positioning system disclosed in CN118404367A uses ball bearings to lock and unlock the rivets. However, the exposed ball bearings and the rivets are in point contact, resulting in uneven force distribution, easy wear, and easy jamming due to metal shavings and foreign objects. Summary of the Invention

[0003] The purpose of this invention is to provide a zero-point positioning device that provides stable locking and prevents jamming.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A zero-point positioning device, comprising: The positioning seat is provided with a positioning hole and a piston mounting space; The clamping assembly has at least three components, which are assembled to the positioning seat and are evenly arranged along the circumference of the positioning hole; A rotating base configured to synchronously drive the clamping assembly to move; The positioning seat has a mounting groove corresponding to the position of the rotating seat. The rotating seat is assembled in the mounting groove. The rotating seat includes a rotating seat body. The edge of the rotating seat body has at least one guide protrusion. The groove wall of the mounting groove has an opening corresponding to the position of the guide protrusion. The opening communicates with the piston mounting space. The guide protrusion extends into the opening and is connected to the piston in a transmission connection. The rotating base is provided with a driving unit corresponding to the position of each of the clamping components. The clamping component includes a clamping arm and a rotating wheel. One end of the rotating wheel is mounted on the clamping arm, and the other end is connected to the clamping component. The driving unit drives the rotating wheel so that the rotating wheel moves away from or towards the center of the positioning hole. A piston, which is movably mounted in the piston mounting space, is configured to drive the rotary seat to rotate such that the three clamping assemblies move synchronously along the radial direction of the positioning hole; A fluid-containing cavity is formed between the piston and the piston mounting space. The fluid-containing cavity is connected to the outside. When the fluid-containing cavity is in the first state after being filled with fluid or the second state after being discharged with fluid, the three clamping components move synchronously toward the center of the positioning hole, either away from or close to it.

[0005] Furthermore, the zero-point positioning device further includes: an elastic element, which is movably assembled in the piston mounting space, with one end of the elastic element abutting against the piston mounting space and the other end of the elastic element connected to the bottom of the piston. When the elastic element acts on the piston, the three clamping assemblies maintain a clamping force on the workpiece.

[0006] Furthermore, the positioning base is provided with a sliding groove corresponding to the position of each of the clamping components, and the clamping components are assembled into the sliding grooves.

[0007] Furthermore, the piston includes: a connecting rod, a first piston head, and a second piston head. The first piston head and the second piston head are both sleeved on the connecting rod. The first piston head, the second piston head, and the connecting rod together form a connecting portion. The guide protrusion is connected to the connecting portion.

[0008] Furthermore, the rotating seat has a through hole at its center, and the driving part is a structural groove formed on the rotating seat. The driving groove includes a first driving groove, a second driving groove, and a guide part. The distances from the first driving groove and the second driving groove to the through hole are different. The first driving groove and the second driving groove are connected through the guide part. The guide part is configured to guide the wheel to move from the first driving groove to the second driving groove or from the second driving groove to the first driving groove.

[0009] Furthermore, the zero-point positioning device includes an end cap and an elastic element. The end cap is sealed at the outlet end of the piston mounting space, and the elastic element is disposed at the end of the piston mounting space and elastically resists the piston. The fluid receiving cavity is formed between the end cap and the piston.

[0010] Furthermore, the zero-point positioning device includes a fluid control device connected to the fluid receiving cavity to control the amount of fluid in the fluid receiving cavity. Under the condition that the fluid control device controls the flow rate into the fluid receiving cavity, the pressure in the fluid receiving cavity is greater than the elastic force of the elastic element, so that the piston moves and drives the rotating seat to rotate, thereby causing the clamping assembly to slide and be housed in the sliding groove.

[0011] Furthermore, an inner air chamber is formed between the piston and the end of the piston mounting space, and the elastic element is disposed in the inner air chamber; the inner air chamber is connected to a pressure regulating air passage, and air is supplied to the inner air chamber through the pressure regulating air passage to increase and control the clamping force of the clamping assembly in the clamping state.

[0012] Furthermore, the zero-point positioning device includes a bottom cover, the positioning hole includes a cover mounting groove, the mounting groove is recessed on the bottom surface of the cover mounting groove, and the bottom cover is used to be installed into the cover mounting groove.

[0013] Compared with the prior art, the present invention proposes a zero-point positioning device. Through the cooperation of the positioning seat, rotating seat, three sets of pistons and three clamping components, the clamping components replace the traditional steel ball locking pull studs, effectively preventing the mechanism from being jammed by metal chips. The large contact area formed by the clamping components provides a stable holding force for the pull studs. Moreover, the surface contact with the pull studs makes them less prone to wear, improving service life and maintaining accuracy. Furthermore, the pistons and clamping components are arranged laterally and have a flat design, effectively saving longitudinal space and making it suitable for clamping workpieces in limited spaces. Attached Figure Description

[0014] Figure 1 A perspective view of the zero-point positioning device from the bottom. Figure 2 A three-dimensional view of the zero-point positioning device from a side perspective; Figure 3 A 3D view of the zero-point positioning device after the bottom cover has been removed; Figure 4 A perspective view of the zero-point positioning device after removing the bottom cover and rotating base; Figure 5 This is a three-dimensional view of the rotating base; Figure 6 This is a cross-sectional view of the zero-point positioning device. Detailed Implementation

[0015] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of protection of the present invention.

[0016] Please see Figures 1 to 6 A zero-point positioning device includes a positioning seat 10, a rotating seat 20, a piston 30, and a clamping assembly 40. The positioning seat 10 has a positioning hole 101 at its center and at least three piston mounting spaces 14 evenly spaced around its periphery. The number of clamping assemblies 40 corresponds to the number of piston mounting spaces 14. Several clamping assemblies 40 are radially and equidistantly mounted on the positioning seat 10 with the positioning hole 101 as the center. The rotating seat 20 is configured to synchronously drive the movement of several clamping assemblies 40. The piston 30 is movably mounted on the piston mounting space 14 and is configured to drive the rotating seat 20 to rotate, causing the several clamping assemblies 40 to synchronously move radially along the positioning hole 101. A fluid receiving cavity 301 is formed between the piston 30 and the piston mounting space 14. The fluid receiving cavity 301 is connected to an external fluid control device. When the fluid receiving cavity 301 is in a first state or a second state, the several clamping assemblies 40 synchronously move away from or towards the center of the positioning hole 101.

[0017] In this embodiment, the positioning base 10 is a cylinder, and its bottom end surface may be provided with an arc ( Figure 6 The dotted circular line shown divides the end face into an inner region 102 and an outer region 103. The positioning seat 10 has a cover groove 11 corresponding to the size of the inner region 102, and a circular mounting groove 12 is coaxially formed on the bottom surface of the cover groove 11. The center of the mounting groove 12 has the positioning hole 101 extending to the top surface of the positioning seat 10. Several sliding grooves 13 are also formed on the bottom surface of the mounting groove 12. Each sliding groove 13 is distributed along the radius of the mounting groove 12, with one end connected to the positioning hole 101 and the other end extending to a predetermined length on the groove wall of the mounting groove 12. The sliding grooves 13 are arranged in a circular matrix, meaning they are arranged at equal angles, radiating out from the positioning hole 101 along the radial direction. In this embodiment, there are three sliding grooves 13, corresponding to three pistons 30 and three clamping components 40. Each sliding groove 13 corresponds to one piston 30 and one clamping component 40.

[0018] The rotating seat 20 is installed in the mounting groove 12. A clamping component 40 is slidably provided in each sliding groove 13. The mounting groove 12 forms a supporting space 121 between each pair of adjacent sliding grooves 13. Openings 141 are equally spaced along the circumferential line on the peripheral wall of the mounting groove 12. Each opening 141 is correspondingly formed outside the supporting space 121. The opening 141 has a preset width and is axially connected to the cover groove 11.

[0019] See also Figure 6 The positioning seat 10 has piston mounting spaces 14 evenly spaced along the annular line on its outer peripheral surface. Each piston mounting space 14 is correspondingly provided with a supporting space 121, and each piston mounting space 14 is correspondingly connected to an opening 141. Each piston mounting space 14 is provided with a piston 30, and the movement of the piston 30 drives the rotating seat 20 to rotate within the mounting groove 12.

[0020] See also Figure 5The rotating seat 20 includes a rotating seat body 201, with a through hole 21 at its center corresponding to the positioning hole 101. At least one guide protrusion 22 is provided on the edge of the rotating seat body 201, extending into the opening 141 and drivingly connected to the piston 30. Specifically, a connecting portion 331 is provided on the peripheral wall of the piston 30 corresponding to the opening 141, allowing the guide protrusion 22 of the rotating seat 20 to extend into the connecting portion 331, thus drivingly connecting the guide protrusion 22 to the piston 30. In this embodiment, the connecting portion 331 is an annular groove formed on the peripheral wall of the piston 30, into which the guide protrusion 22 can extend. Therefore, when the piston 30 moves, the annular groove can drive the guide protrusion 22 to rotate around the center of the rotating seat 20. Furthermore, the annular groove of the piston 30 can be formed by assembly. The piston 30 includes a connecting rod, a first piston head, and a second piston head. The first piston head and the second piston head are both sleeved on the connecting rod. The first piston head, the second piston head, and the connecting rod together form a connecting part 331. The guide protrusion 22 is connected to the connecting part 331.

[0021] A drive unit 23 is provided on the rotating seat body 201 corresponding to the position of each of the clamping components 40. The clamping component 40 includes a clamping arm and a rotating wheel 231 mounted on the clamping arm. One end of the rotating wheel 231 is fitted to the clamping arm, and the other end is connected to the drive unit 23. The drive unit 23 drives the rotating wheel 231 so that the rotating wheel 231 moves away from or closer to the through hole 21.

[0022] In this embodiment, the driving part 23 is a structural groove opened on the rotating base 20. Several structural grooves are opened at equal intervals along the ring line, respectively for mounting the rotating wheel 231. Each structural groove includes a first driving groove, a second driving groove, and a guide part. The distances from the first driving groove and the second driving groove to the through hole 21 are different. The first driving groove and the second driving groove are connected by the guide part, which is configured to guide the rotating wheel to move from the first driving groove to the second driving groove or from the second driving groove to the first driving groove. After the rotating base 20 is installed, the structural groove is located above the sliding groove 13, and the two ends of the structural groove are closer to the through hole 21 and farther away. One end of the rotating wheel 231 is fixedly mounted on the clamping arm, and the other end of the rotating wheel 231 extends into the driving part 23. Specifically, the rotating wheel 231 can be formed by a shaft 232 and a bearing fixedly sleeved on the upper end of the shaft 232. The shaft 232 is fixedly connected to the clamping arm, and the bearing is installed in a structural groove on the rotating seat 20. Thus, when the rotating seat 20 swings clockwise or counterclockwise under the drive of the piston 30, the structural groove swings accordingly, pushing against the rotating wheel 231 and forcing it to move along the groove shape within the structural groove. That is, it guides the rotating wheel 231 from the first driving groove to the second driving groove. The groove may move from the second drive groove to the first drive groove, thereby changing the distance between the rotating wheel 231 and the through hole 21, so that the rotating wheel 231 is closer to or farther away from the through hole 21. The rotating wheel 231 will drive the clamping assembly 40 to slide along the sliding groove 13 through the shaft 232, so that the clamping assembly 40 passes through the positioning hole 101 from the sliding groove 13 or is stored in the sliding groove 13. When several clamping assemblies 40 extend from the sliding groove 13 to the positioning hole 101 at the same time, the workpiece such as a pull stud can be locked.

[0023] See Figure 3 , Figure 6The zero-point positioning device includes an end cap 31 and an elastic element 32. The end cap 31 seals the opening of the piston mounting space 14, forming a fluid receiving cavity 301 between the piston 30 and the end cap 31. An inner air chamber 302 is formed between the piston 30 and the end of the piston mounting space 14. The elastic element 32 is installed in the inner air chamber 302 and elastically resists the piston 30. Each fluid receiving cavity 301 is connected to a fluid control device 303, and each inner air chamber 302 is connected to a pressure regulating air passage (not shown). Under normal conditions, the piston 30 is provided with a spring force towards the piston mounting space 14 by the elastic element 32, causing the piston 30 to move towards the fluid receiving cavity 301, thereby driving the rotating seat 20 to rotate. The rotating seat 20 pushes the rotating wheel 231 through the drive unit 23. Specifically, the drive unit 23 is located away from the through hole 21. The rotating wheel 231 is forced to move, and the movement of the rotating wheel 231 causes the clamping assembly 40 to slide, so that the clamping assembly 40 passes through the sliding groove 13 and into the positioning hole 101, thereby locking the tie pin. Furthermore, air is introduced into the inner air chamber 302 through the pressure regulating air passage to increase the clamping force of the clamping assembly 40. When it is necessary to release the locking of the tie pin, the air pressure in the pressure regulating air passage is released, and the fluid control device 303 introduces air into the fluid receiving cavity 301, so that the pressure in the fluid receiving cavity 301 is greater than the elastic force of the elastic member 32, causing the piston 30 to move in the opposite direction, compressing the elastic member 32. The movement of the piston 30 causes the rotating seat 20 to rotate, and the end of the driving part 23 of the rotating seat 20 away from the through hole 21 forces the rotating wheel 231 to move, which also causes the clamping assembly 40 to slide. The clamping assembly 40 slides into the sliding groove 13 and is released from the locking of the tie pin.

[0024] Furthermore, the inner end of the clamping assembly 40 is formed with an inner arc groove 41 that matches the positioning hole 101 to increase the contact area, provide a stable holding force for the rivet, and make surface contact with the rivet, which is not easy to wear, improves service life, and maintains the accuracy of use.

[0025] Furthermore, the outer end of the sliding groove 13 extends to the inner side of the cover groove 11, and the outer end of the sliding groove 13 and the outer end of the clamping assembly 40 are in a matching outer arc shape, so that the clamping assembly 40 can be housed in the sliding groove 13.

[0026] Furthermore, the positioning seat 10 has a plurality of mounting holes 105 at equal intervals along the edge of the outer perimeter 103, which pass through the top and bottom ends. The mounting holes 105 are located on the outside of the piston mounting space 14 or between two adjacent piston mounting spaces 14. The zero-point positioning device is installed in the preset position by using the mounting holes 105 and bolts.

[0027] Furthermore, the piston 30 has a groove 332 at one end facing the elastic member 32 for the elastic member 32 to pass through, which positions the elastic member 32 and improves the stability of the piston 30.

[0028] Furthermore, the zero-point positioning device includes a bottom cover 104, the mounting groove 12 is recessed in the center of the mounting groove 11, and the bottom cover 104 is used to be installed into the mounting groove 11. Specifically, the mounting groove 11 is provided with a plurality of connecting holes 111 at intervals, and the bottom cover 104 is provided with a countersunk hole 1041 corresponding to each connecting hole 111, so that bolts can be inserted into the countersunk hole 1041 and the connecting hole 111 to install the bottom cover 104 into the positioning hole 101.

[0029] Furthermore, the outer periphery of the rotating seat 20 is provided with inner arc grooves on both sides of each guide protrusion 22 to improve the stability of the rotating seat 20 when it rotates.

[0030] Furthermore, the end of the guide protrusion 22 that penetrates the connecting portion 331 is outwardly arc-shaped, so that when the piston 30 moves in the piston mounting space 14, it pushes the guide protrusion 22 through the connecting portion 331 to move to the end of the opening 141 near the fluid receiving cavity 301 or near the end of the elastic member 32.

[0031] Understandably, the zero-point positioning device of the present invention is a cam-disc type zero-point positioning device, and its usage method is as follows: In the clamping state, the piston 30 is in a normal state, and the elastic element 32 provides a driving force to the piston 30 along the piston mounting space 14 toward the fluid receiving cavity 301, so that the connecting part 331 is aligned with the end of the opening 141 near the fluid receiving cavity 301, and the driving part 23 pushes against the rotating wheel 231 with the end near the through hole 21, driving the clamping assembly 40 to pass through the sliding groove 13 into the positioning hole 101, and can be able to use the pressure regulating air passage to introduce air into the inner air chamber 302, so as to increase and control the pressure of the clamping assembly 40 under clamping; when the zero-point positioning device enters the unlocking state, the piston In the first state where the fluid control device 303 fills the fluid receiving cavity 301 with fluid (i.e., air intake), the pressure in the fluid receiving cavity 301 is greater than the elastic force of the elastic member 32, causing the elastic member 32 to be compressed. The connecting part 331 is aligned with the end of the opening 141 near the elastic member 32, and the rotating seat 20 is rotated. The driving part 23 pushes against the rotating wheel 231 with the end away from the through hole 21, driving the clamping assembly 40 to be housed in the sliding groove 13. When clamping is required, the fluid control device 303 discharges fluid from the fluid receiving cavity 301 (i.e., air exhaust), and the pressure in the fluid receiving cavity 301 is less than the elastic force of the elastic member 32. The clamping assembly 40 is driven to clamp the workpiece by the elastic force.

[0032] In summary, the zero-point positioning device provided by the present invention, through the cooperation between the positioning seat 10, the rotating seat 20, at least three sets of pistons 30, and at least three corresponding clamping components 40, replaces the traditional steel ball locking rivet with the clamping components 40, effectively preventing the mechanism from being jammed by metal chips. The large contact area formed by the clamping components 40 provides a stable holding force for the rivet, and the surface contact with the rivet makes it less prone to wear, improving service life and maintaining accuracy. Furthermore, the pistons 30 and the clamping components 40 are arranged laterally and have a flat design, effectively saving longitudinal space and making it suitable for clamping workpieces in limited spaces.

[0033] Any combination of various embodiments of the present invention, provided it does not violate the inventive concept of the present invention, shall be regarded as the content disclosed by the present invention; within the scope of the technical concept of the present invention, any simple modifications to the technical solution and any combination of different embodiments that do not violate the inventive concept of the present invention shall be within the protection scope of the present invention.

Claims

1. A zero-point positioning device, characterized in that, include: Positioning seat (10), the positioning seat (10) is provided with positioning hole (101) and piston mounting space (14); The clamping assembly (40) has three parts, which are slidably mounted on the positioning seat (10) and are evenly arranged along the circumference of the positioning hole (101); A rotating base (20) is configured to synchronously drive the clamping assembly (40) to move; The positioning seat (10) is provided with a mounting groove (12) corresponding to the position of the rotating seat (20). The rotating seat (20) is assembled in the mounting groove (12). The rotating seat (20) includes: a rotating seat body (201). The edge of the rotating seat body (201) is provided with at least one guide protrusion (22). The groove wall of the mounting groove (12) is provided with an opening (141) corresponding to the position of the guide protrusion (22). The opening (141) communicates with the piston mounting space (14). The guide protrusion (22) extends into the opening (141) and is connected to the piston (30) in a transmission connection. The rotating base (20) is provided with a driving part (23) corresponding to the position of each of the clamping components (40). The clamping component (40) includes a clamping arm and a rotating wheel (231). One end of the rotating wheel (231) is mounted on the clamping arm, and the other end is connected to the driving part (23). The driving part (23) drives the rotating wheel (231) so that the rotating wheel (231) moves toward or away from the center of the positioning hole (101). A piston (30) is movably mounted in the piston mounting space (14) and is configured to drive the rotary seat (20) to rotate such that the three clamping assemblies (40) move synchronously along the radial direction of the positioning hole (101); Wherein, a fluid receiving cavity (301) is formed between the piston (30) and the piston mounting space (14), the fluid receiving cavity (301) is connected to the outside, when the fluid receiving cavity (301) is in the first state after being filled with fluid or the second state after being discharged from fluid, the three clamping assemblies (40) move synchronously toward the center away from or toward the positioning hole (101); An elastic element (32) is assembled in the piston mounting space (14). One end of the elastic element (32) abuts against the piston mounting space (14), and the other end of the elastic element (32) is connected to the bottom of the piston (30). The elastic element (32) acts on the piston (30) so that the clamping assembly (40) maintains a clamping force on the workpiece.

2. The zero-point positioning device according to claim 1, characterized in that, The positioning base (10) is provided with a sliding groove (13) corresponding to the position of each clamping component (40), and the clamping component (40) is assembled in the sliding groove (13).

3. The zero-point positioning device according to claim 1, characterized in that, The piston (30) includes a connecting rod, a first piston head and a second piston head. The first piston head and the second piston head are both sleeved on the connecting rod. The first piston head, the second piston head and the connecting rod together form a connecting part (331). The guide protrusion (22) is connected to the connecting part (331).

4. The zero-point positioning device according to claim 1, characterized in that, The rotating base (20) has a through hole (21) at its center. The driving part (23) is a structural groove formed on the rotating base (20), including a first driving groove, a second driving groove and a guide part. The distances from the first driving groove and the second driving groove to the through hole (21) are different. The first driving groove and the second driving groove are connected through the guide part. The guide part is configured to guide the wheel to move from the first driving groove to the second driving groove or from the second driving groove to the first driving groove.

5. The zero-point positioning device according to claim 1, characterized in that, Includes an end cap (31) that seals the outlet end of the piston mounting space (14), and an elastic element (32) that is disposed at the end of the piston mounting space (14) and elastically abuts against the piston (30). The fluid receiving cavity (301) is formed between the end cap (31) and the piston (30).

6. The zero-point positioning device according to claim 1, characterized in that, The fluid control device (303) is connected to the fluid receiving cavity (301) to control the amount of fluid in the fluid receiving cavity (301). When the fluid control device (303) is in the state of fluid inlet to the fluid receiving cavity (301), the pressure in the fluid receiving cavity (301) is greater than the elastic force of the elastic member (32), so that the piston (30) moves and drives the rotating seat (20) to rotate, thereby driving the clamping assembly (40) to slide and be housed in the sliding groove (13).

7. The zero-point positioning device according to claim 1, characterized in that: An inner air chamber (302) is formed between the piston (30) and the end of the piston mounting space (14), and the elastic element (32) is disposed in the inner air chamber (302). The inner air chamber (302) is connected to a pressure regulating air passage, and air is supplied to the inner air chamber (302) through the pressure regulating air passage to increase and regulate the clamping force of the clamping assembly (40) in the clamping state.

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