Automatic centering and positioning tool for sliding block

Abstract

The utility model discloses an automatic centering and positioning tool for a sliding block, which comprises an electromagnetic base made of a magnetic conductive material, a left push block, a right push block and a wedge-shaped pressing block made of a magnetic attraction material, and an electromagnet and an electromagnet control circuit in the electromagnetic base are connected in series with a control switch on the outer side of the electromagnetic base. The left push block and the right push block can be installed on the upper end face of the electromagnetic base in a relative sliding mode in the horizontal direction, the upper end face of the left push block and the upper end face of the right push block form a positioning datum plane capable of being tightly attached to the bottom face of an inner cavity groove of the sliding block, and a V-shaped containing space is formed between the left push block and the right push block. The wedge-shaped pressing block can be inserted between the left pushing block and the right pushing block in a sliding mode in the depth direction of the V-shaped containing space, the electromagnet in the electromagnetic base obtains electric energy to attract the wedge-shaped pressing block to slide in the direction where the width of the V-shaped containing space is small, and the left pushing block and the right pushing block are forced to be away from each other to expand and fix the two opposite side walls of an inner cavity of the sliding block. According to the utility model, the sliding block can be conveniently and quickly clamped, the positioning is accurate, the outer side of the positioned sliding block is not provided with a complicated jig structure, and the cleaning is convenient.

Description

Technical Field

[0001] The utility model relates to the field of guide rail production, in particular to an automatic centering and positioning tool for a slide block. Background Art

[0002] The ball linear guide pair is generally composed of a guide rail, a slider, a ball, a return device, a cage, a sealing end cover and a baffle, etc., with the ball rolling between the slider and the guide rail instead of relative contact sliding. When the guide rail and the slider make relative motion, the ball will roll along the raceway on the guide rail that has been hardened by heat treatment and precision grinding. At the end of the slider, the ball enters the return channel through the return device (return device) and then enters the raceway, so that the ball rolls over and over again. Dust-proof sealing end covers are installed at both ends of the return device to effectively prevent dust and powder from entering the inside of the slider.

[0003] The guide rails of the ball linear guide pair are installed on the base of the main equipment, and the top surface of the slider of the guide pair is connected to the moving parts of the equipment with threaded holes.

[0004] The top and side surfaces of the slider with raceways and return channels are the installation references of the moving parts of the main equipment. The relative position between this reference and the raceways and return channels greatly affects the guiding accuracy, motion performance and accuracy of the entire guide rail assembly. Its installation top surface, positioning side surfaces and raceways need to undergo multiple precision grinding processes to ensure the precise geometric shape of the raceways and the dimensional accuracy between the raceways and the installation positioning surfaces.

[0005] The return channel of the slider is drilled and milled by CNC machining, the raceway is processed by profiling precision grinding, and the outer datum surface is processed by plane precision grinding. The conversion and definition of the machining datums of the above multiple machining processes have a decisive influence on the final accuracy of the finished product. The machining datums of these sliders are mostly based on the outer contour of the raw material as the positioning datum, and the outer contour is processed by cold drawing (such as Figure 1 ), affected by the process parameters during the cold drawing process and the subsequent heat treatment, the shape contour has various phenomena such as distortion, warping, bending, deformation, and dislocation (such as Figure 2 ), these phenomena directly affect the positioning accuracy and precision of the subsequent processes:

[0006] Problem 1: The slider has an abnormal profile (e.g. Figure 2 ) will cause positioning difficulties. When the outer contour of the slider material is twisted, warped, bent, deformed, dislocated, etc., when the product structural features are processed by a CNC milling machine or a grinder, if the inner contour 61 and the outer contour 62 are used as the processing reference, the processing accuracy of the product is affected by the contour change, and the milling tool and the grinding tool cannot accurately process the distance from the theoretical contour to the center of the return channel hole and other structural features;

[0007] Problem 2: When processing the outer contour of the slider, there is no positioning space for the fixture: Based on the material characteristics and the influence of existing general grinding equipment, when the slider is grinding, because all the outer contours need to be ground, the outer space of the outer contour is the channel space required by the high-speed rotating grinding wheel. There is no movement space for the clamping and positioning mechanism required for positioning in this channel. Therefore, the bottom of the product can only be used as a bearing surface contact device to complete the product positioning and fastening clamping functions, but the bottom of the product is also deformed, which will also affect other structural processing.

[0008] Question 3: The installation method cannot have any extra external pipes: Existing products can only rely on the moving base of the equipment to move on the horizontal plane to meet the processing feed requirements. During the processing, the positioning platform corresponding to the product and the equipment has been in a linear reciprocating motion state. Therefore, the clamping mechanism at the bottom of the product is not convenient to use the clamping mechanism supported by water, oil, gas, circuit and other pipelines to prevent collision during high-speed rotation of the grinding wheel.

[0009] Problem 4: The grinding of the top and side surfaces is not processed in the same process, and the positioning reference conversion in multiple clamping causes processing reference deviation, which makes it difficult to control the final dimensions of the top and side surfaces. Utility Model Content

[0010] In order to overcome the above-mentioned defects, the utility model provides a slider automatic centering and positioning tool, which can quickly and accurately fix and position the slider that needs to be positioned, ensuring high-precision processing of the slider.

[0011] The utility model adopts a technical solution to solve the technical problem: a kind of automatic centering and positioning tooling for a slide block, comprising an electromagnetic base, a left push block, a right push block and a wedge-shaped pressure block, an electromagnetic base made of a magnetic conductive material is provided with an electromagnet and an electromagnet control circuit, a control switch connected in series with the electromagnet control circuit is also provided on the outer side of the electromagnetic base, the control switch can control the on and off of the electromagnet control circuit so that the electromagnet is energized or de-energized, the left push block and the right push block can be installed on the upper end surface of the electromagnetic base in a horizontal direction with relative sliding, and the upper end surfaces of the left push block and the right push block form a positioning block extending in the horizontal direction. The positioning reference surface, the positioning reference surfaces at the upper ends of the left push block and the right push block can be tightly attached to the bottom surface of the inner cavity groove of the slider to be positioned, a V-shaped accommodating space is formed between the left push block and the right push block, and the wedge-shaped pressure block made of magnetic material can be inserted into the V-shaped accommodating space of the left push block and the right push block by sliding along the depth direction of the V-shaped accommodating space, and the electromagnet in the electromagnetic base is energized to attract the wedge-shaped pressure block to slide in the direction of the smaller width of the V-shaped accommodating space through magnetic force, thereby forcing the left push block and the right push block to slide in the direction away from each other to expand and fix the two opposite side walls of the inner cavity of the slider to be positioned.

[0012] As a further improvement of the present invention, the side walls of the left push block and the right push block that face away from each other are vertical direct contact surfaces extending in the vertical direction. The vertical direct contact surfaces can be flatly attached to the opposite side walls of the slider cavity. The upper ends of the vertical direct contact surfaces are connected to the positioning reference surfaces by chamfered surfaces or arc surfaces to avoid the rounded corners of the slider cavity.

[0013] As a further improvement of the present invention, the left push block and the right push block are symmetrically arranged along the plane in the inner cavity of the slider that needs to be positioned, and the opposite side walls of the left push block and the right push block are inclined surfaces that are symmetrical along the plane in the inner cavity of the slider and extend obliquely in the vertical direction. The upper end width of the V-shaped accommodating space formed between the left push block and the right push block is greater than the lower end width, and the wedge-shaped pressure block can be slidably inserted in the V-shaped accommodating space along the vertical direction.

[0014] As a further improvement of the utility model, a reset elastic member is further provided on the electromagnetic base, the upper end of the reset elastic member elastically presses against the lower end of the wedge-shaped pressing block, and the reset elastic member provides an upward elastic reset force to the wedge-shaped pressing block.

[0015] As a further improvement of the present invention, a spring slot is provided at the lower end of the wedge-shaped pressure block, and the reset elastic member is a compression spring, the lower end of the compression spring is fixedly mounted on the electromagnetic base, and the upper end of the compression spring is inserted into the spring slot at the lower end of the wedge-shaped pressure block.

[0016] As a further improvement of the utility model, the upper sections of the opposite side walls of the left push block and the right push block form an inclined surface, and the lower sections of the opposite side walls of the left push block and the right push block form a vertical surface extending in the vertical direction.

[0017] As a further improvement of the utility model, a limiting slot is provided on the electromagnetic base, and the left push block and the right push block can be slidably inserted in the limiting slot on the electromagnetic base, and the side walls of the left push block and the right push block perpendicular to the sliding direction are tightly attached to the inner side walls of the limiting slot, and limiting grooves are formed on the two side walls of the limiting slot respectively, and the two side walls of the left push block and the right push block perpendicular to their sliding directions are respectively provided with convex baffles, the convex baffles can be slidably inserted in the limiting groove, and the convex baffles are stopped on the inner side of the limiting groove along the side walls in the depth direction of the V-shaped accommodating space.

[0018] As a further improvement of the present invention, the opposite side walls of the left push block and the right push block are respectively provided with guide grooves extending along the depth direction of the V-shaped accommodating space, and the two opposite side walls of the wedge-shaped pressure block are respectively provided with guide protrusions, and the guide protrusions on the two opposite side walls of the wedge-shaped pressure block can be slidably inserted into the guide grooves of the left push block and the right push block.

[0019] As a further improvement of the present invention, the cross-sections of the guide groove and the guide protrusion are matching T-shaped structures.

[0020] As a further improvement of the present invention, the electromagnetic base is a T-shaped block whose upper end width is smaller than the lower end width, the lower end of the electromagnetic base can be fixedly installed on the workbench of the machining equipment, and the upper end of the electromagnetic base can be accommodated in the opening of the slider that needs to be positioned; or the electromagnetic base is a U-shaped structure, the left push block and the right push block can be slidably accommodated in the U-shaped structure opening, the lower end of the slider can also be accommodated in the U-shaped structure opening of the electromagnetic base, the width of the wedge-shaped pressure block is greater than the width of the U-shaped structure opening of the electromagnetic base, and the two ends of the lower end of the wedge-shaped pressure block in the width direction are stopped on the upper end surface of the electromagnetic base.

[0021] The beneficial effects of the utility model are as follows: the utility model utilizes the bottom surface of the groove with the smallest deformation in the inner cavity of the slider as the machining reference positioning surface, and utilizes electromagnetism as the power to attract the wedge-shaped pressure block to move downward, and when the wedge-shaped pressure block moves downward, it pushes the left push block and the right push block that form the V-shaped accommodating cavity to move outward and tighten the inner wall of the slider at the same time, avoiding the positioning difference of the slider caused by the outward expansion or inward contraction of the inner cavity contour, achieving the effect of centering positioning, effectively reducing the influence of the deformation of the slider caused by the previous process on the positioning, reducing the process requirements for the previous process in the manufacturing process of the slider, accurately positioning, and reducing the corresponding production cost. The utility model uses electromagnetism as the power, is convenient for quick clamping, has sensitive response, and is easy to control, and the utility model has a simple structure, and there is no complicated fixture structure on the outside of the slider that needs to be positioned, so it is convenient to clean the work table of the machining equipment and the powder chips of the grinding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of a slider that needs to be positioned;

[0023] Figure 2 The main view of the slider that needs to be positioned;

[0024] Figure 3 It is a schematic diagram of the outer contour deformation of the slider after the previous process;

[0025] Figure 4 This is a first structural stereogram of the utility model;

[0026] Figure 5 This is a front view of the first structure of the utility model showing the expansion state of the slider;

[0027] Figure 6 This is a second structural stereogram of the utility model;

[0028] Figure 7 This is the second structural front view of the utility model;

[0029] Figure 8 for Figure 7 Middle AA section view

[0030] Fig. 9It is a three-dimensional state diagram of a positioning slider using the second structure of the utility model;

[0031] Fig.10 This is a diagram of the state of the slider before expansion of the second structure of the utility model;

[0032] Fig.11 for Fig.10 Middle BB section view;

[0033] Fig.12 This is a diagram showing the state of the slider after expansion in the second structure of the utility model;

[0034] Fig.13 for Fig.12 Middle CC section view. DETAILED DESCRIPTION

[0035] Embodiment: A tooling for automatic centering and positioning of a slide block, comprising an electromagnetic base 1, a left push block 2, a right push block 3 and a wedge-shaped pressure block 4. An electromagnet and an electromagnet control circuit are arranged inside the electromagnetic base 1 made of a magnetic conductive material. A control switch connected in series with the electromagnet control circuit is also arranged on the outside of the electromagnetic base 1. The control switch can control the on and off of the electromagnet control circuit so that the electromagnet is energized or de-energized. The left push block 2 and the right push block 3 can be relatively slidably installed on the upper end surface of the electromagnetic base 1 in the horizontal direction. The upper end surfaces of the left push block 2 and the right push block 3 form a positioning reference surface 5 extending in the horizontal direction. The left push block 2 and the right push block 3 are provided with a positioning reference surface 5 extending in the horizontal direction. The positioning reference surface 5 at the upper end of the push block 3 can be tightly attached to the bottom surface 7 of the inner cavity groove of the slider 6 to be positioned, and a V-shaped accommodating space 8 is formed between the left push block 2 and the right push block 3. The wedge-shaped pressure block 4 made of magnetic material can be inserted into the V-shaped accommodating space 8 of the left push block 2 and the right push block 3 by sliding along the depth direction of the V-shaped accommodating space 8. The electromagnet in the electromagnetic base 1 is energized to attract the wedge-shaped pressure block 4 to slide in the direction of the smaller width of the V-shaped accommodating space 8 through magnetic force, thereby forcing the left push block 2 and the right push block 3 to slide in the direction away from each other to expand and fix the two opposite side walls of the inner cavity of the slider 6 to be positioned.

[0036] When the slider 6 needs to be clamped and positioned and machined, the slider 6 to be positioned is first put on the outside of the left push block 2 and the right push block 3. The positioning reference surface 5 on the upper end of the left push block 2 and the right push block 3 is flat on the bottom surface 7 of the inner cavity groove of the slider 6. The bottom surface of the groove with the smallest deformation in the inner cavity of the slider 6 is used as the processing reference positioning surface. Then, electromagnetic power is used to attract the wedge-shaped pressure block 4 along the depth direction of the V-shaped accommodating space 8. When the wedge-shaped pressure block 4 slides in the direction of the smaller width of the V-shaped accommodating space 8, it pushes the left push block 2 and the right push block 3 to move outward and tighten the inner cavity side wall of the slider 6 at the same time, thereby realizing accurate fixed positioning of the slider 6, avoiding positioning differences caused by the outward expansion or inward contraction of the contour of the inner cavity side wall of the product, and achieving the effect of centering positioning.

[0037] The side walls of the left push block 2 and the right push block 3 that face away from each other are vertical direct contact surfaces extending in the vertical direction, and the vertical direct contact surfaces can be flatly attached to the side walls opposite to the inner cavity of the slider 6. The upper ends of the vertical direct contact surfaces are connected with the positioning reference surface 5 through chamfered surfaces or arc surfaces to avoid the rounded corners of the inner cavity of the slider 6. The above structure can achieve stable expansion and tightening of the inner cavity side walls of the slider 6, while avoiding interference with the rounded corners of the inner cavity bottom surface and the side walls of the slider 6.

[0038] The left push block 2 and the right push block 3 are symmetrically arranged along the plane in the inner cavity of the slider 6 to be positioned, and the opposite side walls of the left push block 2 and the right push block 3 are inclined surfaces 9 that are symmetrical along the plane in the inner cavity of the slider 6 and extend obliquely in the vertical direction. The upper width of the V-shaped accommodation space 8 formed between the left push block 2 and the right push block 3 is greater than the lower width, and the wedge-shaped pressure block 4 can be inserted and slidably arranged in the V-shaped accommodation space 8 in the vertical direction. The symmetrical structure of the left push block 2 and the right push block 3 is conducive to ensuring the effect of centering and positioning the slider 6. In addition to sliding vertically up and down to expand the inner cavity side wall of the slider 6, the wedge-shaped pressure block 4 can also expand the inner cavity side wall of the slider 6 by sliding horizontally forward and backward.

[0039] The electromagnetic base 1 is also provided with a resetting elastic member 10, the upper end of which elastically presses against the lower end of the wedge-shaped pressing block 4, and the resetting elastic member 10 provides an upward elastic resetting force to the wedge-shaped pressing block 4. The resetting elastic member 10 can make the wedge-shaped pressing block 4 automatically slide upward and reset after the electromagnetic base 1 loses its magnetism, making it convenient to remove the slider 6 from the outside of the left push block 2 and the right push block 3, and to facilitate the next slider 6 to be smoothly inserted into the outside of the left push block 2 and the right push block 3.

[0040] The lower end of the wedge-shaped pressure block 4 is provided with a spring slot 11, and the reset elastic member 10 is a compression spring, the lower end of which is fixedly mounted on the electromagnetic base 1, and the upper end of which is inserted into the spring slot 11 at the lower end of the wedge-shaped pressure block 4. In addition to using a compression spring to press against the lower end of the wedge-shaped pressure block 4 to provide an elastic reset force, a spring sheet or other elastic member may be used to press against the lower end of the wedge-shaped pressure block 4 to provide an elastic reset force, or a tension spring may be used to pull the left push block 2 and the right push block 3 to provide an elastic reset force, or a pressure block may be used to push the outer side surfaces of the left push block 2 and the right push block 3 to provide an elastic reset force. Such elastic reset structures are equivalent replacement structures that can be thought of by those skilled in the art after seeing this application, and they all belong to the protection scope of this application.

[0041] The upper sections of the opposite side walls of the left push block 2 and the right push block 3 form an inclined surface 9, and the lower sections of the opposite side walls of the left push block 2 and the right push block 3 form a vertical surface 12 extending in the vertical direction. This structure allows a gap between the side wall of the wedge-shaped pressing block 4 and the lower sections of the left push block 2 and the right push block 3 after the wedge-shaped pressing block 4 slides down to the inner side wall of the expansion slider 6, thereby preventing the wedge-shaped pressing block 4 from being unable to smoothly reset after losing its magnetic attraction due to negative pressure generated between the wedge-shaped pressing block 4 and the side walls of the left push block 2 and the right push block 3 after the wedge-shaped pressing block 4 is pressed down.

[0042] A limiting slot 13 is provided on the electromagnetic base 1, and the left push block 2 and the right push block 3 can be slidably inserted in the limiting slot 13 on the electromagnetic base 1, and the side walls of the left push block 2 and the right push block 3 perpendicular to the sliding direction are tightly attached to the inner side walls of the limiting slot 13, and limiting grooves 16 are respectively formed on the two side walls of the limiting slot 13, and the two side walls of the left push block 2 and the right push block 3 perpendicular to their sliding directions are respectively provided with convex stop bars, and the convex stop bars can be slidably inserted in the limiting groove 16, and the convex stop bars are stopped on the inner side of the limiting groove 16 along the side walls of the V-shaped accommodating space 8 in the depth direction. The limiting slot 13 can guide the horizontal sliding of the left push block 2 and the right push block 3, so as to prevent the left push block 2 and the right push block 3 from offsetting when sliding against each other, and the convex blocking bars on the left push block 2 and the right push block 3 are blocked in the limiting grooves 16 on the two side walls of the limiting slot 13, so as to limit the left push block 2 and the right push block 3 in the depth direction of the V-shaped accommodating space 8, and ensure accurate and effective expansion of the inner cavity side wall of the slider 6.

[0043] The left push block 2 and the right push block 3 are provided with guide grooves 14 extending in the depth direction of the V-shaped accommodation space 8 on the opposite side walls, and the wedge-shaped pressing block is provided with guide protrusions 15 on the two opposite side walls, which can be slidably inserted into the guide grooves 14 of the left push block 2 and the right push block 3. The guide grooves 14 are provided on the push block and the right push block 3, and match with the guide protrusions 15 on the wedge-shaped pressing block to guide the sliding of the wedge-shaped pressing block and avoid the wedge-shaped pressing block from tilting when sliding.

[0044] The cross-sections of the guide groove 14 and the guide protrusion 15 are matched T-shaped structures. The T-shaped structure realizes that the left push block 2, the right push block 3 and the wedge-shaped pressing block 4 form a plug-in structure, and the three will not separate, and as the wedge-shaped pressing block slides up and down, it can automatically drive the left push block 2 and the right push block 3 to move relatively close or relatively away, thereby realizing automatic expansion and release of the inner cavity of the slider 6.

[0045] The electromagnetic base 1 is a T-shaped block whose upper width is smaller than the lower width. The lower end of the electromagnetic base 1 can be fixedly installed on the workbench of the machining equipment, and the upper end of the electromagnetic base 1 can be accommodated in the opening of the slider 6 that needs to be positioned; or the electromagnetic base 1 is a U-shaped structure, and the left push block 2 and the right push block 3 can be slidably accommodated in the opening of the U-shaped structure, and the lower end of the slider 6 can also be accommodated in the U-shaped structure opening of the electromagnetic base 1. The width of the wedge-shaped pressure block is greater than the width of the opening of the U-shaped structure of the electromagnetic base 1, and the two ends of the lower end of the wedge-shaped pressure block in the width direction are stopped on the upper end surface of the electromagnetic base 1. The upper end width of the electromagnetic base 1 is smaller than the inner cavity size of the slider 6 opening, so as to avoid the slider 6 opening part, avoid the electromagnetic base 1 and the slider 6 opening end surface from interfering with each other, and affect the positioning accuracy.

[0046] The steps of clamping and positioning the slider 6 in the utility model are as follows:

[0047] First, the electromagnetic base 1 is fixedly installed on the working table of the machining equipment;

[0048] Then, the slider 6 to be clamped and positioned is sleeved on the outside of the left push block 2 and the right push block 3, so that the positioning reference surface 5 on the upper end of the left push block 2 and the right push block 3 is flat against the bottom surface 7 of the inner cavity groove of the slider 6;

[0049] Next, close the control switch on the electromagnetic base 1, the electromagnet is energized to generate magnetic force, the wedge-shaped pressure block (iron material or magnet) is attracted by the magnetic force and slides down, the left push block 2 and the right push block 3 move outward to tighten the inner cavity side wall of the slider 6, and the slider 6 is accurately fixed and positioned on the worktable of the machining equipment with its inner cavity groove bottom surface 7 with the smallest deformation as a reference, and the machining equipment is started to process the slider 6. Due to the small positioning error, the processing accuracy of the slider 6 can be guaranteed.

Claims

1. A slider automatic centering and positioning tool, characterized by: The invention comprises an electromagnetic base (1), a left push block (2), a right push block (3) and a wedge-shaped pressure block (4); an electromagnet and an electromagnet control circuit are arranged in the electromagnetic base made of a magnetic conductive material; a control switch connected in series with the electromagnet control circuit is also arranged on the outer side of the electromagnetic base; the control switch can control the on and off of the electromagnet control circuit so that the electromagnet is energized or de-energized; the left push block and the right push block can be relatively slidably installed on the upper end surface of the electromagnetic base in a horizontal direction; the upper end surfaces of the left push block and the right push block form a positioning reference surface (5) extending in the horizontal direction; the upper surfaces of the left push block and the right push block are provided with a positioning reference surface (5) extending in the horizontal direction; The positioning reference surface at the end can be closely attached to the bottom surface (7) of the inner cavity groove of the slider (6) to be positioned, and a V-shaped accommodating space (8) is formed between the left push block and the right push block. The wedge-shaped pressure block made of magnetic material can be inserted into the V-shaped accommodating space of the left push block and the right push block by sliding along the depth direction of the V-shaped accommodating space. The electromagnet in the electromagnetic base is energized to attract the wedge-shaped pressure block to slide in the direction of the smaller width of the V-shaped accommodating space through magnetic force, thereby forcing the left push block and the right push block to slide in the direction away from each other to expand and fix the two opposite side walls of the inner cavity of the slider to be positioned.

2. The automatic centering and positioning tooling for a slider according to claim 1 is characterized in that: The side walls of the left push block and the right push block that face away from each other are vertical direct contact surfaces extending in the vertical direction. The vertical direct contact surfaces can be flatly attached to the opposite side walls of the slider cavity. The upper ends of the vertical direct contact surfaces are connected to the positioning reference surfaces through chamfered surfaces or arc surfaces to avoid the rounded corners of the slider cavity.

3. The automatic centering and positioning tool for a slider according to claim 2 is characterized in that: The left push block and the right push block are symmetrically arranged along the plane in the inner cavity of the slider that needs to be positioned, and the opposite side walls of the left push block and the right push block are inclined surfaces (9) that are symmetrical along the plane in the inner cavity of the slider and extend obliquely in the vertical direction. The upper end width of the V-shaped accommodation space formed between the left push block and the right push block is greater than the lower end width, and the wedge-shaped pressure block can be inserted into the V-shaped accommodation space so as to slide in the vertical direction.

4. The automatic centering and positioning tool for a slider according to claim 3 is characterized in that: The electromagnetic base is also provided with a resetting elastic member (10), the upper end of which elastically presses against the lower end of the wedge-shaped pressing block, and the resetting elastic member provides an upward elastic resetting force to the wedge-shaped pressing block.

5. The automatic centering and positioning tool for a slider according to claim 4 is characterized in that: A spring slot (11) is provided at the lower end of the wedge-shaped pressing block, and the resetting elastic member is a compression spring, the lower end of which is fixedly mounted on the electromagnetic base, and the upper end of which is inserted into the spring slot at the lower end of the wedge-shaped pressing block.

6. The automatic centering and positioning tool for a slider according to claim 3 is characterized in that: The upper sections of the opposite side walls of the left push block and the right push block form an inclined surface, and the lower sections of the opposite side walls of the left push block and the right push block form a vertical surface (12) extending in the vertical direction.

7. The automatic centering and positioning tool for a slider according to claim 1 is characterized in that: The electromagnetic base is provided with a limit slot (13), the left push block and the right push block can be slidably inserted into the limit slot on the electromagnetic base, and the side walls of the left push block and the right push block perpendicular to the sliding direction are tightly attached to the inner side wall of the limit slot, and the side walls of the limit slot are respectively formed with limit grooves (16), and the side walls of the left push block and the right push block perpendicular to the sliding direction are respectively provided with convex stop bars, the convex stop bars can be slidably inserted into the limit slot, and the convex stop bars are stopped at the inner side of the limit slot along the side walls in the depth direction of the V-shaped accommodating space.

8. The automatic centering and positioning tool for a slider according to claim 1 is characterized in that: The opposite side walls of the left push block and the right push block are respectively provided with guide grooves (14) extending in the depth direction of the V-shaped accommodation space, and the opposite side walls of the wedge-shaped pressing block are respectively provided with guide protrusions (15), and the guide protrusions on the opposite side walls of the wedge-shaped pressing block can be slidably inserted into the guide grooves of the left push block and the right push block.

9. The automatic centering and positioning tool for a slider according to claim 8, characterized in that: The cross sections of the guide groove and the guide protrusion are matching T-shaped structures.

10. The automatic centering and positioning tool for a slide block according to claim 1, characterized in that: The electromagnetic base is a T-shaped block with an upper end width smaller than a lower end width, the lower end of the electromagnetic base can be fixedly mounted on a workbench of a machining device, and the upper end of the electromagnetic base can be accommodated in an opening of a slider that needs to be positioned; or the electromagnetic base is a U-shaped structure, the left push block and the right push block can be slidably accommodated in the opening of the U-shaped structure, the lower end of the slider can also be accommodated in the opening of the U-shaped structure of the electromagnetic base, the width of the wedge-shaped pressure block is larger than the width of the opening of the U-shaped structure of the electromagnetic base, and both ends of the lower end of the wedge-shaped pressure block in the width direction are stopped on the upper end surface of the electromagnetic base.

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