Post-pulling type PSC zero-point repeated positioning structure of machine tool

Abstract

The invention discloses a machine tool back-pulling type PSC zero-point repeated positioning structure, and relates to the technical field of machine tool positioning tools, the machine tool back-pulling type PSC zero-point repeated positioning structure comprises a shell, the shell is connected with a machine tool spindle through a flange, and a channel is formed in the shell in the axis direction in a penetrating mode; one end of the PSC module head extends into the channel and is provided with a clamping groove; the first pull rod is arranged in the shell, one end of the first pull rod is connected with a machine tool pull rod through a connecting piece, the other end of the first pull rod extends into the clamping groove, the first pull rod is sleeved with a clamping assembly, and the end, away from the machine tool, of the first pull rod is provided with an extrusion part used for being matched with the clamping assembly. During use, the machine tool pull rod moves to drive the first pull rod to get close to a machine tool, and the clamping assembly is switched from a natural state to an open state through cooperation of the extrusion part and the clamping assembly, so that the clamping assembly can abut against the clamping groove, and clamping and positioning of the PSC module head are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool positioning tools, and in particular to a rear-pull PSC zero-point repeated positioning structure for a machine tool. Background Art

[0002] As the domestic manufacturing industry transforms to high-end manufacturing, the demand for fast switching of fixtures and tools to reduce machine tool downtime is increasing. This provides a broad space for the zero-point positioning market. At the same time, with the rapid development of Industry 4.0 and intelligent manufacturing, fixture switching is developing in the direction of intelligence. At the same time, with the maturity of manufacturing technology, the improvement of design capabilities, the increase in product yield, and the more advantageous market price, the market demand for products will grow steadily.

[0003] At present, the mandrel and chuck fixtures have the advantage in the form of repeated positioning of machine tool back-pull. However, these fixtures only clamp a single workpiece and have a small application range. Mandrel fixtures use expansion sleeves to tighten a hole in the workpiece, and chucks use collets to clamp the workpiece shaft, which puts a test on the workpiece body accuracy and clamping position. It is now necessary to provide a structure that can connect different modules to quickly clamp different workpieces. For this purpose, we propose a machine tool back-pull PSC zero-point repeated positioning structure. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a machine tool rear-pull type PSC zero-point repeated positioning structure.

[0005] The present invention provides a machine tool back-pull type PSC zero point repeated positioning structure, comprising: A housing, the housing being connected to a machine tool spindle via a flange, the housing axis extending along a first direction, and a channel penetrating the housing along the first direction; A PSC module head, one end of which extends into the channel and is provided with a clamping groove; A first pull rod, one end of which is connected to a machine tool pull rod through a connector, and the first pull rod is movably arranged in the channel, and one end thereof away from the machine tool extends into the clamping groove, and a clamping assembly is movably sleeved on the first pull rod, and the end of the first pull rod away from the machine tool has an extrusion portion for cooperating with the clamping assembly so that the clamping assembly switches to an open state to squeeze the clamping groove to clamp the PSC module head.

[0006] According to the technical solution provided by the present invention, the first pull rod is successively a first connection section, a second connection section, and a third connection section along the first direction. A connection groove is provided at one end of the first connection section away from the second connection section for connecting with the connector; the clamping assembly is movably sleeved on the second connection section; the third connection section has an extrusion part for cooperating with the clamping assembly to switch the clamping assembly to an open state.

[0007] According to the technical solution provided by the present invention, the clamping assembly includes an elastic member sleeved on the second connection section and relatively close to the first connection section; The clamping assembly further includes an expansion ring sleeved on the second connection section and located on the side of the elastic member away from the first connection section. The expansion ring has a natural state and an open state, and a connection protrusion is provided at one end of the outer circumferential wall of the expansion ring close to the elastic member.

[0008] According to the technical solution provided by the present invention, the clamping assembly further includes a retaining ring sleeved on the expansion ring. A first groove corresponding to the connection protrusion is provided on the inner circumferential wall of the retaining ring. The retaining ring is composed of two butt-jointed semi-circular structures. A second groove is provided on the outer wall of the retaining ring, and a retaining ring is provided in the second groove.

[0009] According to the technical solution provided by the present invention, the outer wall of one end of the expansion ring away from the elastic member has a clamping protrusion. The clamping groove includes a receiving groove and a clamping groove. The receiving groove is used to receive the third connection section, and the clamping groove is provided on the inner wall of the receiving groove. When the expansion ring is in the open state, the third connection section pushes the expansion ring through the extrusion part so that the clamping protrusion extends into the clamping groove.

[0010] According to the technical solution provided by the present invention, it further includes an airtight channel. The airtight channel includes a first passage and a second passage. The first passage is opened in the first pull rod, one end of which is communicated with the connection groove, and the other end is communicated with the outer wall of the first connection section. The second passage is opened inside the housing, one end of which is communicated with the channel, and the other end is communicated with the side wall of the housing contacting the PSC module head.

[0011] According to the technical solution provided by the present invention, a limit baffle is provided at one end of the housing close to the machine tool for limiting the first pull rod.

[0012] According to the technical solution provided by the present invention, the channel has a stepped section with a diameter smaller than that of the first connection section for limiting the first pull rod.

[0013] According to the technical solution provided by the present invention, one end of the PSC module head extending into the channel is a multi-prismatic structure, and one end of the channel close to the PSC module head is adapted to the multi-prismatic structure.

[0014] In summary, the present invention specifically discloses a rear-pulling PSC zero-point repeat positioning structure for a machine tool, including a housing, which is connected to the machine tool spindle through a flange, and a channel is axially penetrated through the housing; one end of the PSC module head extends into the channel, and a clamping groove is provided; a first pull rod is arranged in the housing, one end of which is connected to the machine tool pull rod through a connecting piece, and the other end extends into the clamping groove, and a clamping component is sleeved on the first pull rod. One end of the first pull rod away from the machine tool has an extrusion part for cooperating with the clamping component; During use, the machine tool pull rod moves to drive the first pull rod close to the machine tool. Through the cooperation of the extrusion part and the clamping component, the clamping component is switched from the natural state to the open state, so that the clamping component can abut against the clamping groove to realize the clamping and positioning of the PSC module head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 It is a schematic diagram of a rear-pulling PSC zero-point repeat positioning structure for a machine tool.

[0016] Figure 2 It is an exploded view of a rear-pulling PSC zero-point repeat positioning structure for a machine tool.

[0017] Figure 3 It is an exploded view of the clamping component.

[0018] Figure 4 It is a schematic diagram of the receiving groove.

[0019] Figure 5 It is a cross-sectional view of a rear-pulling PSC zero-point repeat positioning structure for a machine tool.

[0020] Reference numerals in the figures: 1. Housing; 2. PSC module head; 3. First pull rod; 4. Extrusion part; 5. First connecting section; 6. Second connecting section; 7. Third connecting section; 8. Connecting groove; 9. Elastic member; 10. Expansion ring; 11. Connecting protrusion; 12. Retaining ring; 13. Retaining washer; 14. Clamping protrusion; 15. First passage; 16. Second passage; 17. Limit baffle; 18. Step stage; 19. O-ring; 20. Receiving groove; 21. Clamping groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than limiting the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0022] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] Please refer to Figures 1 to 5 As shown, a rear-pulling PSC zero-point repeat positioning structure for a machine tool includes: A housing 1, the housing 1 is connected to the machine tool spindle through a flange, the axis of the housing 1 extends along a first direction, and a channel is provided through the housing 1 along the first direction; the first direction is Figure 5 the horizontal direction in Further, one end of the housing 1 is provided with bolt holes for connecting the flange, and the housing 1 is connected to the machine tool spindle through the flange; A PSC module head 2, the axis of the PSC module head 2 extends along the first direction, one end of the PSC module head 2 extends into the channel, and a clamping groove is provided; Further, the PSC module head 2 has a first section and a second section fixedly connected along the first direction. Among them, the clamping groove is provided on the side wall of the first section away from the second section, and the diameter of the second section is larger than that of the first section; A first pull rod 3, one end of the first pull rod 3 is connected to the machine tool pull rod through a connecting member, and the first pull rod 3 is movably arranged in the channel. The end away from the machine tool extends into the clamping groove, and a clamping assembly is movably sleeved on the first pull rod 3. The end of the first pull rod 3 away from the machine tool has a pressing portion 4 for cooperating with the clamping assembly to switch the clamping assembly to an open state to press the clamping groove to clamp the PSC module head 2; Further, the first pull rod 3 includes a first connecting section 5, a second connecting section 6, and a third connecting section 7 along the first direction. A connecting groove 8 is provided at the end of the first connecting section 5 away from the second connecting section 6. Optionally, the connecting groove 8 can be a threaded groove for threaded connection with the connecting member, and the end of the connecting member away from the first pull rod 3 is threadedly connected to the machine tool pull rod; Thus, by moving the machine tool pull rod along the first direction, the first pull rod 3 can be driven to move along the first direction through the connecting member, and then through the action of the pressing portion 4 on the third connecting section 7, the clamping assembly is switched to an open state, so that the PSC module head 2 can be clamped; Further, the clamping groove includes a receiving groove 20 and a clamping groove 21. The receiving groove 20 is used to receive the third connecting section 7, and the clamping groove 21 is provided on the inner wall of the receiving groove 20; Thus, after the first pull rod 3 moves to switch the clamping assembly to the open state, the extrusion part 4 can push the clamping assembly to extend into the clamping groove 21, so as to clamp the PSC module head 2; The clamping assembly includes an elastic member 9, which is sleeved on the second connecting section 6 and relatively close to the first connecting section 5; Optionally, the elastic member 9 is a spring; The clamping assembly further includes an expansion ring 10, which is sleeved on the second connecting section 6 and located on the side of the elastic member 9 away from the first connecting section 5. Both ends of the elastic member 9 respectively abut against the first connecting section 5 and the expansion ring 10. The expansion ring 10 has a natural state and an open state, and a connecting protrusion 11 is provided on the outer wall of the end of the expansion ring 10 close to the elastic member 9, and a clamping protrusion 14 is provided on the outer wall of the end of the expansion ring 10 away from the elastic member 9; It should be noted that the extrusion part 4 can be an inclined surface, and its diameter gradually decreases along the direction away from the PSC module head 2; By moving the first pull rod 3 in the first direction, one end of the expansion ring 10 moves along the surface of the extrusion part 4, and the extrusion part 4 can push open the expansion ring 10 to switch the expansion ring 10 from the natural state to the open state; When the expansion ring 10 is in the open state, the third connecting section 7 pushes the expansion ring 10 through the extrusion part 4 to extend the clamping protrusion 14 into the clamping groove 21, so as to clamp the PSC module head 2; Furthermore, an installation groove is provided at one end of the expansion ring 10 close to the machine tool, and an O-ring 19 is arranged in the installation groove. Through the O-ring 19, the expansion ring 10 can be limited to prevent the expansion ring 10 from falling off; Furthermore, the clamping assembly further includes a retaining ring 12, which is sleeved on the expansion ring 10, and a first groove corresponding to the connecting protrusion 11 is provided on the circumferential inner wall of the retaining ring 12. Thus, the connecting protrusion 11 is extended into the first groove to realize the connection with the expansion ring 10; Furthermore, the retaining ring 12 is composed of two butt-jointed semi-circular structures, and a second groove is provided on the outer wall of the retaining ring 12, and a retaining ring 13 is arranged in the second groove. By installing the retaining ring 13 in the second groove, the retaining ring 12 can be limited.

[0024] It also includes an airtight channel, which includes a first passage 15 and a second passage 16. The first passage 15 is opened in the first pull rod 3. One end of the first passage 15 is communicated with the connecting groove 8, and the other end is communicated with the outer wall of the first connecting section 5 of the first pull rod 3; The second passage 16 is opened in the housing 1, one end of which is communicated with the channel, and the other end is communicated with the side wall of the housing 1 away from the machine tool; It further includes an external airtight detection device, which is connected to the first passage 15. After assembling the pull-back PSC zero-point repeat positioning structure of the machine tool, for the part of the PSC module head 2 located outside the housing 1, the side wall thereof close to the machine tool can abut against the side wall of the housing 1 away from the machine tool. At this time, the first passage 15 is connected to the second passage 16, and whether there is air leakage between the PSC module head 2 and the housing 1 can be detected through the external airtight detection device, so as to realize airtightness detection; optionally, air can be filled into the airtight passage and the pressure can be maintained, and whether there is air leakage between the PSC module head 2 and the housing 1 can be judged according to whether the air pressure value changes, so as to detect whether the PSC module head 2 and the housing 1 are in place in contact.

[0025] Optionally, three airtight passages are uniformly arranged in the circumferential direction.

[0026] A limit baffle 17 is arranged at one end of the housing 1 close to the machine tool for limiting the first pull rod 3. Optionally, it is installed by bolts, and can limit the first pull rod 3 when the first pull rod 3 moves towards the machine tool, so as to avoid production accidents caused by excessive movement of the first pull rod 3; Furthermore, the passage has a stepped stage 18, and the diameter of the stepped stage 18 is smaller than the diameter of the first connecting section 5, which can limit the first pull rod 3. The stepped stage 18 is located on the side of the first connecting section 5 away from the machine tool, and can limit the first pull rod 3 when the first pull rod 3 moves away from the machine tool, so as to avoid production accidents caused by excessive movement of the first pull rod 3; The production mechanism has a stroke limit. Since the strokes of different PSC module heads 2 are different, the limit baffle 17 and the stepped stage 18 are designed to ensure safety; The strokes of different PSC module heads 2 are as follows in the table:

[0027] It is the distance between the plane where the side wall of the third connecting section 7 away from the machine tool is located and the plane where the side wall of the housing 1 away from the machine tool is located.

[0028] One end of the PSC module head 2 extending into the passage is a multi-prism structure, such as Figure 4 As shown, one end of the PSC module head 2 extending into the passage is a triangular prism structure, and one end of the passage close to the PSC module head 2 is adapted to the triangular prism structure; thus, through the triangular prism structure, when the PSC module head 2 is installed, stability and installation accuracy can be ensured. Combining the high profile accuracy at one end of the PSC module head 2, the high coaxiality of the PSC module head 2 with the first pull rod 3, the extrusion part 4 and the machine tool pull rod, the repeat positioning accuracy is high, and the repeat positioning accuracy is within 0.002 mm.

[0029] Working principle: During assembly, first, the elastic member 9 is sleeved on the second connection section 6, then the expansion ring 10 is installed, and the O-ring 19 limits the position of the expansion ring 10. Then, the retaining ring 12 is installed, so that the connecting protrusion 11 extends into the first groove, and the retaining ring 12 is limited by the retaining ring 13 to realize the limitation of the retaining ring 12. In the initial state, the extrusion part 4 is far away from the expansion ring 10 to ensure that the expansion ring 10 is in a natural state. The PSC module head 2 is installed, and the third connection section 7 extends into the clamping groove, so that the PSC module head 2 contacts the side wall of the machine tool close to the side wall of the housing 1 away from the machine tool. Whether the PSC module head 2 and the housing 1 are in place in contact is detected by an external airtight detection device. Then, the machine tool is started, and the first pull rod 3 is pulled by the machine tool pull rod. The first pull rod 3 approaches the machine tool in the first direction, so that the extrusion part 4 contacts the expansion ring 10. As the first pull rod 3 moves, the extrusion part 4 pushes the expansion ring 10, so that the expansion ring 10 is switched from the natural state to the open state, and the clamping protrusion 14 extends into the clamping groove 21. Thus, the rapid clamping of the PSC module head 2 is realized, and at the same time, the PSC module head 2 of different specifications can be quickly replaced. Through the clamping assembly, in cooperation with the triangular prism structure of the PSC module head 2, and the coaxial cooperation of the machine tool pull rod, the first pull rod 3 and the extrusion part 4, high positioning accuracy can be ensured.

[0030] The above description is only the preferred embodiment of the present invention and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A machine tool back-pull type PSC zero point repeated positioning structure, characterized in that: include: A housing (1), the housing (1) being connected to a machine tool spindle via a flange, the axis of the housing (1) extending along a first direction, and a channel penetrating the housing (1) along the first direction; A PSC module head (2), one end of the PSC module head (2) extending into the channel and provided with a clamping groove; A first pull rod (3), one end of the first pull rod (3) is connected to a machine tool pull rod via a connecting piece, and the first pull rod (3) is movably arranged in the channel, and one end thereof away from the machine tool extends into the clamping groove, and a clamping assembly is movably sleeved on the first pull rod (3), and the end of the first pull rod (3) away from the machine tool has an extrusion portion (4) for cooperating with the clamping assembly so that the clamping assembly switches to an open state to squeeze the clamping groove to clamp the PSC module head (2).

2. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 1 is characterized in that: The first pull rod (3) is composed of a first connecting section (5), a second connecting section (6) and a third connecting section (7) in sequence along the first direction; the first connecting section (5) is provided with a connecting groove (8) at one end away from the second connecting section (6) for connecting with the connecting piece; the clamping assembly is movably sleeved on the second connecting section (6); the third connecting section (7) has an extrusion portion (4) for cooperating with the clamping assembly to switch the clamping assembly to an open state.

3. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 2 is characterized in that: The clamping assembly comprises an elastic member (9), which is sleeved on the second connecting section (6) and is relatively close to the first connecting section (5); The clamping assembly further comprises an expansion ring (10), the expansion ring (10) being sleeved on the second connecting section (6) and being located on a side of the elastic member (9) away from the first connecting section (5), the expansion ring (10) having a natural state and an open state, and a connection protrusion (11) being provided on one end of a circumferential outer wall of the expansion ring (10) close to the elastic member (9).

4. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 3 is characterized in that: The clamping assembly further comprises a retaining ring (12), the retaining ring (12) being sleeved on the expansion ring (10), and the circumferential inner wall of the retaining ring (12) being provided with a first groove corresponding to the connecting protrusion (11), the retaining ring (12) being two butted semicircular structures, the outer wall of the retaining ring (12) being provided with a second groove, and a retaining ring (13) being provided in the second groove.

5. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 3 is characterized in that: The outer wall of one end of the expansion ring (10) away from the elastic member (9) has a clamping protrusion (14), and the clamping groove comprises a receiving groove (20) and a clamping groove (21). The receiving groove (20) is used to receive the third connecting section (7), and the clamping groove (21) is arranged on the inner wall of the receiving groove (20). When the expansion ring (10) is in the open state, the third connecting section (7) pushes the expansion ring (10) through the extrusion portion (4) so ​​that the clamping protrusion (14) extends into the clamping groove (21).

6. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 2 is characterized in that: It also includes an airtight passage, the airtight passage including a first passage (15) and a second passage (16), the first passage (15) being opened in the first pull rod (3), one end of which is connected to the connecting groove (8), and the other end of which is connected to the outer wall of the first connecting section (5), and the second passage (16) being opened in the shell (1), one end of which is connected to the passage, and the other end of which is connected to the side wall of the shell (1) contacting the PSC module head (2).

7. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 1 is characterized in that: A limit stopper (17) is provided at one end of the housing (1) close to the machine tool, for limiting the position of the first pull rod (3).

8. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 2, characterized in that: The channel has a step (18) whose diameter is smaller than the diameter of the first connecting section (5) and is used to limit the position of the first pull rod (3).

9. The machine tool back-pull type PSC zero-point repeated positioning structure according to claim 1, characterized in that: One end of the PSC module head (2) extending into the channel is a polygonal column structure, and one end of the channel close to the PSC module head (2) is adapted to the polygonal column structure.

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