Self-centering table for ring-shaped workpieces

Abstract

This utility model discloses a self-centering worktable for annular workpieces, comprising a worktable body, a positioning device, a worktable drive device, and an ejection device. The positioning device includes a base fixedly mounted on the worktable body, with two sets of slides symmetrically arranged on the upper part of the base, each set of slides having at least one positioning shaft. Left and right lead screws are rotatably connected to the base, with a connector at one end of each lead screw. The worktable drive device includes a support platform, with a motor and a reducer mounted on one side of the support platform, and a docking device detachably connected to the connector at one end of the rotating shaft. A telescopic drive mechanism is provided on the fixed base, with its telescopic end connected to the support platform. This utility model, by installing the ejection device and the worktable drive device at the rear of the machine tool, allows the ejection device to drive the worktable drive device out of the processing area during workpiece processing, avoiding interference between the worktable drive device and the workpiece or cutting tool, and enhancing the versatility of the self-centering worktable.

Description

Technical Field

[0001] This utility model belongs to the field of worktables, and specifically relates to a self-centering worktable for ring-shaped workpieces. Background Technology

[0002] In industrial production, the precise positioning, alignment, and stable clamping of ring-shaped workpieces are core prerequisites for ensuring the accuracy of subsequent processing and product quality. Traditional ring-shaped workpiece positioning and clamping requires operators to manually adjust or repeatedly calibrate the workpiece position using simple tooling. The entire process is time-consuming and labor-intensive, severely restricting the improvement of production efficiency. More importantly, traditional clamping often applies external force from the circumference of the workpiece for fixation, which can easily cause deformation of the workpiece due to uneven force.

[0003] To address the aforementioned issues, the applicant previously developed a workpiece positioning device (CN214265298U), which achieves precise workpiece positioning through a positioning mechanism. The positioning mechanism includes at least two protrusions that extend into openings in the workpiece, and at least one protrusion is movable relative to the others. When the protrusion moves to the edge of the opening, the workpiece is positioned through the coordinated action of multiple protrusions. These protrusions are respectively mounted on corresponding slides, which are connected to a linear drive unit. The linear drive unit can drive multiple slides to move simultaneously in opposite directions, thereby adjusting the position of the protrusions. In this design, the linear drive unit uses a left- and right-hand integrated ball screw, which is connected to a motor or other power source. The motor is connected to the ball screw via a coupling to provide driving force.

[0004] However, in practical applications, it has been found that existing workpiece positioning devices have certain technical defects. Specifically, because the linear drive unit (especially the drive structure using a motor) is installed close to the workpiece processing area, when positioning and clamping some ring-shaped workpieces with special dimensions or complex structures, the drive unit is prone to interference with the workpiece or tool, which makes it impossible to complete the centering and clamping operation smoothly. This seriously affects the versatility and processing efficiency of the equipment and urgently needs further improvement. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a self-centering worktable for annular workpieces, so as to solve the problem of interference between the linear drive unit and the workpiece or tool in the existing annular workpiece positioning device, and enhance the versatility of annular centering workpiece clamping.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A self-centering worktable for a ring-shaped workpiece, comprising: The worktable body is installed in the workpiece processing area of ​​the machine tool; The positioning device includes a base fixedly installed on the workbench body, guide rails on both sides of the base, two sets of slides symmetrically arranged on the upper part of the base, each set of slides having at least one positioning shaft; the lower part of the slides is slidably connected to the guide rails through several sliders; left and right screws are rotatably connected to the base, one end of the left and right screws is provided with a connector, and the lower part of the slides is threadedly connected to the left and right screws through screw nuts. The workbench drive device includes a support platform, a motor and a reducer are installed on one side of the support platform, a rotating shaft is connected to the output shaft of the reducer, and a docking device that can be detachably connected to the connector is provided at one end of the rotating shaft. The ejection device includes a fixed base that is fixedly installed on the machine tool. The fixed base is equipped with a telescopic drive mechanism, and the telescopic end of the telescopic drive mechanism is connected to the support platform.

[0007] Furthermore, the cross-section of the connector is rectangular or triangular.

[0008] Furthermore, both the docking device and the connector have chamfered end faces.

[0009] Furthermore, the docking device is a wrench, one end of which is fixedly connected to the rotating shaft, and the other end of the wrench is provided with a docking hole that matches the connector, and the docking hole is clearance-fitted with the connector.

[0010] Furthermore, the telescopic drive mechanism is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0011] Furthermore, the rotating shaft adopts a two-section structure, with the two sections connected by a spring to buffer the impact when the docking device docks with the left and right screws; a plug rod is fixedly provided at the end of the rotating shaft near the docking device, and a plug hole that fits with the plug rod at the end of the rotating shaft away from the docking device, in order to ensure the coaxiality of the two sections of the rotating shaft and reduce the runout when the rotating shaft rotates.

[0012] Furthermore, the cross-section of the connector rod adopts a non-circular structure. For example, the connector rod adopts a square tube structure, which reduces the torque of the spring when the rotating shaft drives the left and right screws to rotate, and extends the service life of the spring.

[0013] Furthermore, the base is provided with electro-permanent magnetic chucks on both sides. The electro-permanent magnetic chucks are fixedly installed on the worktable body. The upper end surface of the electro-permanent magnetic chucks is flush with the upper surface of the slide table and is used to adsorb and fix the ring-shaped workpiece.

[0014] Furthermore, a first accordion protective cover is provided between the slide and the end of the base, and a second accordion protective cover is provided between the two slides.

[0015] Furthermore, the wrench has several air holes in its circumferential direction, and a cleaning device is provided on one side of the support platform. The cleaning device includes a cleaning pipe, one end of which is connected to an air source through an air pipe, and the other end of which points to the air holes for cleaning iron filings splashed into the mating hole.

[0016] The beneficial effects of this utility model are: (1) By installing an ejection device and a worktable drive device at the rear of the machine tool, and setting a docking device at the end of the rotating shaft of the worktable drive device to dock with the left and right screws, the worktable drive device exits the processing area when the workpiece is processed, thus avoiding interference between the worktable drive device and the workpiece or tool and enhancing the versatility of the self-centering worktable.

[0017] (2) By setting a spring at the telescopic end of the telescopic drive mechanism, the impact when the docking device docks with the left and right rotary screws is reduced, ensuring the stability of the docking.

[0018] (3) The use of an electro-permanent magnet chuck to adsorb and fix the ring-shaped workpiece avoids the end face jumping during workpiece processing and ensures the processing accuracy of the workpiece.

[0019] (4) A first bellows protective cover is installed between the slide and the end of the base, and a second bellows protective cover is installed between the two slides to prevent iron filings from interfering with the smoothness of the slide movement.

[0020] (5) Multiple air holes are opened around the wrench, and a cleaning pipe for cleaning the docking hole is set on the side of the support platform to ensure the reliability of docking device and left and right screw. Attached Figure Description

[0021] Figure 1 This is a front view of a self-centering worktable for a ring-shaped workpiece according to this utility model.

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 This is a top view of a self-centering worktable for a ring-shaped workpiece according to this utility model.

[0024] Figure 4 This is a schematic diagram of the assembly of the worktable body and the positioning device.

[0025] Figure 5 This is a schematic diagram of the positioning device after the first bellows cover, the second bellows cover, and the slide are removed.

[0026] Figure 6 This is a schematic diagram of a wrench.

[0027] In the diagram, 1. Workbench body; 2. Base; 21. Guide rail; 22. Slider; 23. Left and right rotary screws; 24. Connecting joint; 25. Slide table; 26. Positioning shaft; 27. Electro-permanent magnet chuck; 28. First bellows protective cover; 29. ​​Second bellows protective cover; 210. Screw nut; 3. Workbench drive device; 31. Support platform; 32. Motor; 33. Reducer; 34. Rotating shaft; 35. Wrench; 36. Air hole; 37. Spring; 38. Connecting rod; 4. Push-out device; 5. Cleaning device; 6. Fixed seat. Detailed Implementation

[0028] The following will be combined with the appendix Figures 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] like Figure 1 , Figure 3 As shown, a self-centering worktable for a ring-shaped workpiece includes a worktable body 1, a positioning device, a worktable drive device 3, and an ejection device 4. The worktable body 1 is installed in the workpiece processing area of ​​the machine tool and is used to support the positioning device; the positioning device is used for self-centering clamping of the ring-shaped workpiece, such as... Figure 4 , Figure 5 As shown, the positioning device includes a base 2 fixedly installed on the workbench body 1. Guide rails 21 are provided on both sides of the base 2. Two sets of slides 25 are symmetrically provided on the upper part of the base 2. Each set of slides 25 has at least one positioning shaft 26. In this embodiment, each set of slides 25 has two positioning shafts 26. The lower part of the slides 25 is slidably connected to the guide rails 21 through several sliders 22. Left and right screws 23 are rotatably connected to the base 2. One end of the left and right screws 23 is provided with a connector 24. The lower part of the slides 25 is threadedly connected to the left and right screws 23 through screw nuts 210.

[0031] like Figure 1 , Figure 3As shown, the worktable drive device 3 is used to drive the left and right lead screws 23 to rotate, causing the two sets of slides 25 to move closer or further apart, so that the positioning shaft 26 supports the inner hole of the workpiece, thereby realizing the self-centering clamping of the ring workpiece. The worktable drive device 3 includes a support platform 31. A motor 32 and a reducer 33 are installed on one side of the support platform 31. A rotating shaft 34 is connected to the output shaft of the reducer 33. One end of the rotating shaft 34 is provided with a docking device that can be detachably connected to the docking joint 24.

[0032] like Figure 1 , Figure 3 As shown, the ejection device 4 is used to push the support platform 31 to move left and right, so as to realize the connection and separation of the docking device and the left and right rotary screws 23. The ejection device 4 includes a fixed seat 6 fixedly installed on the machine tool. The fixed seat 6 is provided with a telescopic drive mechanism. The telescopic end of the telescopic drive mechanism is connected to the support platform 31.

[0033] When centering and clamping the annular workpiece, the workpiece is placed on the slides 25 on both sides of the base 2. The push-out device 4 pushes the support platform 31 to move towards one side of the worktable body 1. When the docking device docks with the joint 24 at the end of the left and right screw 23, the push-out device 4 stops. At this time, the motor 32 of the worktable drive device 3 drives the rotating shaft 34 to rotate through the reducer 33. The rotating shaft 34 drives the docking device to rotate, thereby driving the left and right screw 23 to rotate, so that the slides 25 on both sides of the base 2 move away from each other, and the positioning shaft 26 supports the inner hole of the workpiece, thus completing the rapid centering and clamping of the annular workpiece.

[0034] After the annular workpiece is centered and clamped, the motor 32 stops running, the push-out device 4 retracts, separating the docking device from the docking joint 24, and resetting the worktable drive device 3 to the rear of the machine tool, away from the workpiece processing area, effectively avoiding the problem of interference between the workpiece and the worktable drive device 3.

[0035] The cross-section of the connector 24 is rectangular or triangular, such as... Figure 4 , Figure 5 As shown, in this embodiment, the cross-section of the connector is square, which effectively ensures the effect of the docking device driving the connector 24 to rotate.

[0036] like Figure 6 As shown, both the end faces of the docking device and the mating joint 24 are chamfered to facilitate quick and accurate docking between the docking device and the mating joint 24.

[0037] like Figure 6 As shown, the docking device is a wrench 35. One end of the wrench 35 is fixedly connected to the rotating shaft 34, and the other end of the wrench 35 is provided with a docking hole that matches the docking head 24. The docking hole and the docking head 24 are in clearance fit.

[0038] The telescopic drive mechanism is a pneumatic cylinder, hydraulic cylinder, or electric cylinder, such as... Figure 1 , Figure 3 As shown, in this embodiment, the telescopic drive mechanism uses a cylinder.

[0039] like Figure 2 As shown, the rotating shaft 34 adopts a two-section structure, and the two sections of the rotating shaft are connected by a spring 37 to buffer the impact when the docking device docks with the left and right screws 23, thus ensuring the stability of the docking. A plug rod 38 is fixedly provided at the end of the rotating shaft near the docking device, and a plug hole that fits with the plug rod is provided at the end of the rotating shaft away from the docking device to ensure the coaxiality of the two sections of the rotating shaft and reduce the runout when the rotating shaft 34 rotates.

[0040] The cross-section of the plug rod 38 is non-circular. For example, the plug rod 38 is a square tube structure, which reduces the torque of the spring 37 when the rotating shaft 34 drives the left and right screw 23 to rotate, and extends the service life of the spring 37.

[0041] like Figures 3-5 As shown, the base 2 is provided with electro-permanent magnetic chucks 27 on both sides. The electro-permanent magnetic chucks 27 are fixedly installed on the worktable body 1. The upper end surface of the electro-permanent magnetic chuck 27 is flush with the upper surface of the slide table 25. It is used to adsorb and fix the annular workpiece to avoid end face jump of the annular workpiece during processing and to ensure the processing accuracy of the annular workpiece. After the workpiece is processed, the electro-permanent magnetic chuck 27 is demagnetized and reset. At the same time, the push-out device 4 pushes the worktable drive device 3 to move to one side of the worktable body 1, so that the docking device and the docking joint 24 are docked again. The motor 32 reverses, so that the slide tables 25 on both sides are brought closer to each other. The positioning shaft 26 releases the annular workpiece and the workpiece can be removed.

[0042] like Figure 3 , Figure 4 As shown, a first bellows cover 28 is provided between the end of the slide table 25 and the base 2, and a second bellows cover 29 is provided between the two slide tables 25. The first bellows cover 28 and the second bellows cover 29 prevent iron filings generated during the processing of the workpiece from falling onto the base 2 and affecting the smoothness of the movement of the slide table 25.

[0043] like Figure 6 As shown, the wrench 35 has several air holes 36 in the circumferential direction, such as... Figure 1 , Figure 3 As shown, a cleaning device 5 is provided on one side of the support platform 31. The cleaning device 5 includes a cleaning pipe. One end of the cleaning pipe is connected to an air source through an air pipe (not shown in the figure), and the other end of the cleaning pipe points to the air hole 36. It is used to clean the iron filings splashed into the docking hole, ensuring the stability of the docking device and the left and right screw 23.

[0044] The above content is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the utility model, they should all fall within the protection scope of this utility model.

Claims

1. A self-centering worktable for a ring-shaped workpiece, comprising: The worktable body is installed in the workpiece processing area of ​​the machine tool; The positioning device includes a base fixedly installed on the workbench body, guide rails on both sides of the base, two sets of slides symmetrically arranged on the upper part of the base, each set of slides having at least one positioning shaft; the lower part of the slides is slidably connected to the guide rails through several sliders; left and right helical screws are rotatably connected to the base, characterized in that one end of the left and right helical screws is provided with a connecting joint, and the lower part of the slides is threadedly connected to the left and right helical screws through a screw nut. The workbench drive device includes a support platform, a motor and a reducer are installed on one side of the support platform, a rotating shaft is connected to the output shaft of the reducer, and a docking device that can be detachably connected to the connector is provided at one end of the rotating shaft. The ejection device includes a fixed base that is fixedly installed on the machine tool. The fixed base is equipped with a telescopic drive mechanism, and the telescopic end of the telescopic drive mechanism is connected to the support platform.

2. A self-centering table for annular workpieces according to claim 1, characterized in that, The cross-section of the connector is rectangular or triangular.

3. A self-centering table for annular workpieces according to claim 1, characterized in that, Both the docking device and the connector have chamfered ends.

4. A self-centering table for annular workpieces according to claim 1, characterized in that, The docking device is a wrench. One end of the wrench is fixedly connected to the rotating shaft, and the other end of the wrench is provided with a docking hole that matches the connector. The docking hole is clearance-fitted with the connector.

5. A self-centering worktable for annular workpieces according to claim 1, characterized in that, The telescopic drive mechanism is a pneumatic cylinder, hydraulic cylinder, or electric cylinder.

6. A self-centering worktable for annular workpieces according to claim 1, characterized in that, The rotating shaft adopts a two-section structure, and the two sections of the rotating shaft are connected by a spring to buffer the impact when the docking device docks with the left and right screws. A plug rod is fixedly provided at the end of the rotating shaft near the docking device, and a plug hole that fits with the plug rod at the end of the rotating shaft away from the docking device is provided to ensure the coaxiality of the two sections of the rotating shaft and reduce the runout when the rotating shaft rotates.

7. A self-centering table for ring-shaped workpieces according to claim 6, characterized in that The cross-section of the connector rod is non-circular.

8. A self-centering worktable for annular workpieces according to claim 1, characterized in that, The base is equipped with electro-permanent magnetic chucks on both sides. The electro-permanent magnetic chucks are fixedly installed on the worktable body. The upper surface of the electro-permanent magnetic chucks is flush with the upper surface of the slide table and is used to adsorb and fix the ring-shaped workpiece.

9. A self-centering worktable for annular workpieces according to claim 1, characterized in that, A first accordion cover is provided between the slide and the end of the base, and a second accordion cover is provided between the two slides.

10. A self-centering table for annular workpieces according to claim 4, characterized in that, The wrench has several air holes in its circumference, and a cleaning device is provided on one side of the support platform. The cleaning device includes a cleaning pipe, one end of which is connected to an air source through an air pipe, and the other end of which points to the air hole for cleaning iron filings splashed into the mating hole.

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