Numerical control machine tool negative pressure vacuum clamp tooling

Abstract

This application relates to a negative pressure vacuum fixture for CNC machine tools, belonging to the technical field of vacuum fixtures. It includes a worktable with a vacuum disk placed on it. A cleaning brush and a drive assembly are provided on the worktable. The drive assembly includes a motor, a screw, and a first slider. The motor is slidably mounted on the vertical sidewall of the worktable, and its output end is fixedly connected to one end of the screw. The screw passes through and is threadedly connected to the first slider. The first slider slides relative to the vacuum disk along the length of the screw. A connecting rod is provided between the cleaning brush and the first slider, with one end fixed to the cleaning brush and the other end rotatably connected to the first slider. A lifting assembly for adjusting the vertical position of the cleaning brush is provided on the worktable. This application facilitates cleaning of the top surface of vacuum disks of different sizes.

Description

Technical Field

[0001] This application relates to the technical field of vacuum fixtures, and in particular to a negative pressure vacuum fixture for CNC machine tools. Background Technology

[0002] In vacuum clamping, the workpiece is firmly pressed onto the worktable by the external atmospheric pressure, rather than being "sucked" onto it as commonly believed. The lateral force that the workpiece can withstand is mainly determined by the surface structure, the pressure difference, and the contact area. The larger the contact area, the greater the clamping force. A vacuum refers to a space containing absolutely no matter, but in practice, we usually define a space where the air pressure is less than atmospheric pressure as a vacuum.

[0003] A vacuum disk is installed on the worktable and is connected to an external vacuum pump. The workpiece to be processed is placed on the surface of the vacuum disk, and the vacuum pump is started, which can "suck" the workpiece to be processed onto the top of the vacuum disk.

[0004] In actual operation, whether there are foreign objects, such as dust particles, on the top of the vacuum disk is a factor affecting the suction force of the vacuum suction cup on the workpiece. In order to deal with different workpieces, it is often necessary to replace the vacuum disk of different sizes on the worktable. Before each use, the top of the vacuum suction cup needs to be wiped manually, which is inconvenient to operate. Utility Model Content

[0005] To facilitate the cleaning of the top surface of vacuum disks of different sizes, this application provides a negative pressure vacuum fixture for CNC machine tools.

[0006] The CNC machine tool negative pressure vacuum fixture provided in this application adopts the following technical solution:

[0007] A CNC machine tool negative pressure vacuum fixture includes a worktable with a vacuum disk placed on it. A cleaning brush and a drive assembly are provided on the worktable. The drive assembly includes a motor, a screw, and a first slider. The motor is slidably mounted on the vertical sidewall of the worktable, and its output end is fixedly connected to one end of the screw. The screw passes through and is threadedly connected to the first slider. The first slider slides relative to the vacuum disk along the length of the screw. A connecting rod is provided between the cleaning brush and the first slider, with one end fixed to the cleaning brush and the other end rotatably connected to the first slider. A lifting assembly for adjusting the vertical position of the cleaning brush is provided on the worktable.

[0008] By adopting the above technical solution, the motor starts and drives the screw to rotate, which in turn drives the first slider to slide along the length of the screw. This causes the cleaning brush to move back and forth on the top surface of the vacuum disc for cleaning, eliminating the need for manual wiping. The lifting component can adjust the vertical position of the cleaning brush. When changing to vacuum discs of different sizes, the cleaning brush can be raised or lowered to adapt to the top surface of vacuum discs of different heights, enabling rapid cleaning of vacuum discs of various specifications, significantly improving operational convenience and reducing equipment preparation time.

[0009] Optionally, the lifting assembly includes a first cylinder and a left baffle. The left baffle is slidably mounted on the worktable and has a first elongated hole along the length of the screw. The first cylinder is vertically fixed on the worktable and its piston end is fixedly connected to the bottom of the left baffle. The first slider is located inside the first elongated hole.

[0010] By adopting the above technical solution, the extension and retraction of the piston in the first cylinder can drive the left baffle to rise and fall vertically, while the first slider slides within the first elongated hole, thereby synchronously adjusting the height of the cleaning brush. This structure, through precise cylinder control, achieves stable adjustment of the cleaning brush's vertical position, quickly adapting to vacuum discs of different thicknesses and ensuring appropriate contact pressure between the cleaning brush and the top surface of the vacuum disc: excessive pressure can damage the bristles and the surface of the vacuum disc, while insufficient pressure results in poor cleaning performance. Simultaneously, the guiding function of the first elongated hole ensures the stability of the cleaning brush during its raising and lowering process, preventing swaying that could affect the cleaning effect.

[0011] Optionally, a rack is fixed on the left baffle, the rack is arranged along the length of the left baffle, and a gear is fixed on the connecting rod, the gear meshing with the rack.

[0012] By adopting the above technical solution, the motor drives the first slider to move via a screw. The first slider drives the connecting rod to move horizontally, and the gear meshing with the rack rotates accordingly, thereby causing the connecting rod and the cleaning brush to rotate. The rotation of the cleaning brush combined with the reciprocating movement driven by the first slider forms a "rolling cleaning" mode. Compared with simple horizontal cleaning, this mode can more efficiently remove dust particles and stubborn stains from the surface of the vacuum disc, especially effectively cleaning impurities in corners and crevices. At the same time, the rack and pinion drive has the characteristics of compact structure and stable transmission ratio, ensuring uniform rotation speed of the cleaning brush and improving cleaning quality and efficiency.

[0013] Optionally, the workbench is provided with a right baffle and a second cylinder. The right baffle and the left baffle are arranged opposite to each other. The right baffle is slidably arranged on the workbench in a vertical direction. The second cylinder is fixed vertically on the workbench and the piston end is fixed to the bottom surface of the right baffle. A second elongated hole is opened on the right baffle. The opening direction of the second elongated hole is the same as that of the first elongated hole. A second slider is slidably arranged on the right baffle. The second slider is located in the second elongated hole. The cleaning brush is rotatably connected to the second slider at one end near the right baffle.

[0014] By adopting the above technical solution, the second cylinder drives the right baffle to rise and fall vertically, cooperating with the left baffle to achieve synchronous adjustment of the height of both ends of the cleaning brush, ensuring that the cleaning brush is always parallel to the top surface of the vacuum disc and avoiding uneven cleaning due to tilting. The sliding of the second slider within the second elongated hole works in conjunction with the first slider to make the cleaning brush move more smoothly when moving horizontally. One end of the cleaning brush is rotatably connected to the second slider, and the other end is connected to the first slider through a connecting rod, allowing the cleaning brush to maintain flexible movement during translation and rotation, adapting to the surface of the vacuum disc of different shapes and enhancing the comprehensiveness of cleaning.

[0015] Optionally, a connecting pipe is provided between the second slider and the cleaning brush. The cleaning brush is roller-shaped and hollow inside. One end of the connecting pipe is connected to the inside of the cleaning brush, and the other end passes through the second slider and is rotatably connected to the second slider. The end of the connecting pipe away from the cleaning brush is used to connect to an external air pump. An air extraction hole is provided on the cleaning brush.

[0016] By adopting the above technical solution, an external air pump is connected to an internal hollow roller-shaped cleaning brush via a connecting pipe. The air extraction holes on the cleaning brush generate negative pressure suction during the cleaning process. When the cleaning brush rolls and sweeps, the air extraction holes adsorb dust particles on the surface of the vacuum disk, preventing impurities from flying and causing secondary pollution, while also enhancing the cleaning effect on fine particles. This design combines sweeping and dust collection functions, which, compared to traditional cleaning methods, can effectively reduce residual impurities on the surface of the vacuum disk, improve the suction force of the vacuum suction cup on the workpiece, and ensure the stability of the workpiece during processing.

[0017] Optionally, multiple air extraction holes are provided on the cleaning brush, and the lines connecting all the air extraction holes are distributed in a spiral shape on the cleaning brush, with adjacent air extraction holes spaced apart; the bristles of the cleaning brush itself are distributed in a spiral shape and are arranged adjacent to the air extraction holes.

[0018] By adopting the above technical solution, the spirally distributed air extraction holes and bristles enable the cleaning brush to perform spiral-shaped full-coverage cleaning and adsorption on the surface of the vacuum disk during its rolling process. The spacing between adjacent air extraction holes ensures even distribution of negative pressure suction, avoiding insufficient suction in certain areas; the spacing between the bristles and air extraction holes allows impurities to be promptly pushed to the vicinity of the air extraction holes during cleaning, improving adsorption efficiency. This layout allows the cleaning brush to complete the cleaning, gathering, and adsorption of impurities in a single rolling motion, significantly improving cleaning efficiency and cleanliness compared to a linear distribution structure, and is especially suitable for the rapid cleaning of large-area vacuum disks.

[0019] Optionally, the first slider is provided with a first roller, which rolls against the inner wall of the first elongated hole, and the second slider is provided with a second roller, which rolls against the inner wall of the second elongated hole.

[0020] By adopting the above technical solution, the first roller and the second roller roll against the inner walls of the first and second elongated holes respectively, converting the sliding friction between the slider and the hole wall into rolling friction, significantly reducing motion resistance, making the movement of the first slider and the second slider smoother, reducing the load on the drive components, and extending the service life of the equipment.

[0021] Optionally, the cross-section of the hole wall of both the first elongated hole and the second elongated hole is arc-shaped concave.

[0022] By adopting the above technical solution, the arc-shaped concave hole wall fits tightly with the roller, providing a stable guiding effect, preventing the slider from deviating or getting stuck during movement, ensuring that the cleaning brush moves smoothly in a straight line, and guaranteeing the accuracy of the cleaning trajectory and the consistency of the cleaning effect.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The cleaning brush is driven to move back and forth by a screw-slider structure driven by a motor. Combined with a gear and rack, the cleaning brush rotates, forming a "translation + rolling" composite cleaning mode. No manual wiping is required. It can quickly and efficiently remove dust and stains from the surface of the vacuum disc, greatly improving cleaning efficiency and reducing equipment preparation time.

[0025] 2. Lifting components allow for precise adjustment of the vertical position of the cleaning brush, enabling it to flexibly adapt to vacuum discs of different thicknesses and sizes;

[0026] 3. The roller-shaped hollow cleaning brush, combined with spirally distributed air holes and bristles, organically integrates sweeping and vacuuming functions. During the rolling cleaning process, the negative pressure suction can instantly adsorb dust particles, preventing secondary pollution. It is particularly effective at cleaning tiny impurities, effectively improving the surface cleanliness of the vacuum plate and enhancing the clamping stability of the vacuum suction cup on the workpiece. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0028] Figure 2 This is a partial structural cross-sectional view of the left baffle.

[0029] Figure 3 This is a partial structural cross-sectional view of the right baffle.

[0030] In the diagram, 1. Workbench; 11. Vacuum disk; 12. Right baffle; 121. Second elongated hole; 13. Second slider; 131. Second roller; 14. Second cylinder; 2. Cleaning brush; 21. Air extraction hole; 3. Drive assembly; 31. Motor; 32. Screw; 33. First slider; 331. First roller; 4. Connecting rod; 41. Gear; 5. Lifting assembly; 51. First cylinder; 52. Left baffle; 521. First elongated hole; 522. Rack; 6. Connecting pipe. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0032] This application discloses a negative pressure vacuum fixture for CNC machine tools.

[0033] like Figure 1 and Figure 2 As shown, the CNC machine tool negative pressure vacuum fixture includes a worktable 1, which serves as the basic supporting structure. A vacuum disk 11 is placed on top of the worktable 1, and the vacuum disk 11 is connected to an external vacuum pump (not shown in the figure) for fixing the workpiece to be processed by negative pressure adsorption. The worktable 1 is equipped with a cleaning brush 2 and a drive assembly 3, wherein the drive assembly 3 includes a motor 31, a screw 32, and a first slider 33. The motor 31 is vertically slidably mounted along the vertical sidewall of the worktable 1 via a sliding groove, and its output end is fixedly connected to one end of the screw 32. The screw 32 horizontally passes through the first slider 33 and is threadedly connected to it. The first slider 33 slides relative to the vacuum disk 11 along the length of the screw 32. A connecting rod 4 is provided between the cleaning brush 2 and the first slider 33. One end of the connecting rod 4 is fixed to the cleaning brush 2, and the other end is rotatably connected to the first slider 33, providing conditions for the rotation of the cleaning brush 2.

[0034] refer to Figure 1 , Figure 2 and Figure 3The workbench 1 is also equipped with a lifting assembly 5, which includes a first cylinder 51 and a left baffle 52. The left baffle 52 is slidably mounted on the workbench 1 and slides vertically. The left baffle 52 has a first elongated hole 521 along the length of the screw 32. The first cylinder 51 is vertically fixed to the bottom of the workbench 1, and the piston end of the first cylinder 51 is fixedly connected to the bottom surface of the left baffle 52. The first slider 33 is embedded in the first elongated hole 521, and a first roller 331 is installed on the first slider 33. The first roller 331 rolls against the inner wall of the first elongated hole 521. The cross-section of the hole wall of the first elongated hole 521 is designed to be arc-shaped and concave, which fits tightly with the first roller 331, providing stable guidance for the movement of the first slider 33. When the piston of the first cylinder 51 extends or retracts, it drives the left baffle 52 to rise or fall, thereby adjusting the vertical position of the first slider 33 and the cleaning brush 2. A rack 522 is fixed on the left baffle 52 along its length. A gear 41 that meshes with the rack 522 is fixedly sleeved in the middle of the connecting rod 4. When the first slider 33 moves, it drives the connecting rod 4 to move horizontally, causing the gear 41 to roll along the rack 522 and drive the cleaning brush 2 to rotate.

[0035] refer to Figure 1 , Figure 2 and Figure 3 On the workbench 1, a right baffle 12 and a second cylinder 14 are positioned opposite the left baffle 52. The right baffle 12 is slidably mounted vertically on the workbench 1, and the second cylinder 14 is vertically fixed to the bottom of the workbench 1, with its piston end fixed to the bottom surface of the right baffle 12. A second elongated hole 121, aligned with the first elongated hole 521, is provided on the right baffle 12. A second slider 13 is located within the second elongated hole 121 and slides along its length. A second roller 131 is mounted on the second slider 13, and the second roller 131 makes rolling contact with the inner wall of the second elongated hole 121. The cross-section of the second elongated hole 121 is designed as an arc-shaped concave shape, closely fitting the second roller 131 to provide stable guidance for the movement of the second slider 13.

[0036] refer to Figure 1 , Figure 2 and Figure 3 A connecting pipe 6 is provided between the second slider 13 and the cleaning brush 2. The cleaning brush 2 is roller-shaped and hollow inside. One end of the connecting pipe 6 is connected to the inside of the cleaning brush 2, and the other end passes through the second slider 13 and is rotatably connected to the second slider 13. The port of the connecting pipe 6 away from the cleaning brush 2 is used to connect to an external air pump (not shown in the figure). Multiple air extraction holes 21 are evenly opened on the surface of the cleaning brush 2. The line connecting all the air extraction holes 21 is spirally distributed, and adjacent air extraction holes 21 are spaced apart. The bristles of the cleaning brush 2 are also spirally distributed and spaced apart from the air extraction holes 21.

[0037] The implementation principle of this embodiment is as follows: When the top surface of the vacuum disk 11 needs to be cleaned, the first cylinder 51 and the second cylinder 14 are activated according to the thickness of the vacuum disk 11, and the heights of the left baffle 52 and the right baffle 12 are adjusted so that the cleaning brush 2 maintains a suitable distance from the top surface of the vacuum disk 11 and remains horizontal. Then, the motor 31 is turned on, driving the screw 32 to rotate, which in turn drives the first slider 33 to slide along the length of the screw 32. The first slider 33, through the connecting rod 4, drives the cleaning brush 2 to reciprocate horizontally on the top surface of the vacuum disk 11. During this process, the rack 522 on the left baffle 52 meshes with the gear 41, causing the cleaning brush 2 to rotate synchronously, achieving a combined "horizontal movement + rolling" cleaning action. Simultaneously, an external air pump creates negative pressure inside the cleaning brush 2 through the connecting pipe 6, and the air extraction holes 21 adsorb dust particles raised during the cleaning process, preventing secondary pollution. The spirally distributed air extraction holes 21 and bristles on the cleaning brush 2 ensure full coverage cleaning and adsorption of the surface of the vacuum disk 11, effectively removing impurities.

[0038] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A negative pressure vacuum fixture for a CNC machine tool, comprising a worktable (1) on which a vacuum disk (11) is placed, characterized in that: The workbench (1) is provided with a cleaning brush (2) and a drive assembly (3). The drive assembly (3) includes a motor (31), a screw (32) and a first slider (33). The motor (31) is slidably disposed on the vertical side wall of the workbench (1) in the vertical direction. The output end of the motor (31) is fixedly connected to one end of the screw (32). The screw (32) passes through the first slider (33) and is threadedly connected to the first slider (33). The first slider (33) is slidably disposed relative to the vacuum disk (11) along the length direction of the screw (32). A connecting rod (4) is provided between the cleaning brush (2) and the first slider (33). One end of the connecting rod (4) is fixed to the cleaning brush (2), and the other end is rotatably connected to the first slider (33). The workbench (1) is provided with a lifting assembly (5) for adjusting the vertical position of the cleaning brush (2).

2. The CNC machine tool negative pressure vacuum fixture according to claim 1, characterized in that: The lifting assembly (5) includes a first cylinder (51) and a left baffle (52). The left baffle (52) is slidably disposed on the worktable (1). A first elongated hole (521) is provided on the left baffle (52). The first elongated hole (521) is opened along the length direction of the screw (32). The first cylinder (51) is fixed vertically on the worktable (1) and the piston end is fixedly connected to the bottom of the left baffle (52). The first slider (33) is located in the first elongated hole (521).

3. The CNC machine tool negative pressure vacuum fixture according to claim 2, characterized in that: A rack (522) is fixed on the left baffle (52), the rack (522) is arranged along the length direction of the left baffle (52), and a gear (41) is fixed on the connecting rod (4), the gear (41) meshes with the rack (522).

4. The CNC machine tool negative pressure vacuum fixture according to claim 2, characterized in that: The workbench (1) is provided with a right baffle (12) and a second cylinder (14). The right baffle (12) and the left baffle (52) are arranged opposite to each other. The right baffle (12) is slidably arranged on the workbench (1) in the vertical direction. The second cylinder (14) is fixed vertically on the workbench (1) and the piston end is fixed to the bottom surface of the right baffle (12). The right baffle (12) is provided with a second elongated hole (121). The second elongated hole (121) is opened in the same direction as the first elongated hole (521). The right baffle (12) is slidably arranged with a second slider (13). The second slider (13) is located in the second elongated hole (121). The cleaning brush (2) is rotatably connected to the second slider (13) at one end near the right baffle (12).

5. A CNC machine tool negative pressure vacuum fixture according to claim 4, characterized in that: A connecting pipe (6) is provided between the second slider (13) and the cleaning brush (2). The cleaning brush (2) is roller-shaped and hollow inside. One end of the connecting pipe (6) is connected to the inside of the cleaning brush (2), and the other end passes through the second slider (13) and is rotatably connected to the second slider (13). The end of the connecting pipe (6) away from the cleaning brush (2) is used to connect to an external air pump. An air extraction hole (21) is opened on the cleaning brush (2).

6. The CNC machine tool negative pressure vacuum fixture according to claim 5, characterized in that: Multiple air extraction holes (21) are provided on the cleaning brush (2). The lines connecting all the air extraction holes (21) are spirally distributed on the cleaning brush (2), and adjacent air extraction holes (21) are spaced apart. The bristles of the cleaning brush (2) itself are spirally distributed and adjacent air extraction holes (21) are provided.

7. A CNC machine tool negative pressure vacuum fixture according to claim 4, characterized in that: The first slider (33) is provided with a first roller (331), which rolls against the inner wall of the first elongated hole (521). The second slider (13) is provided with a second roller (131), which rolls against the inner wall of the second elongated hole (121).

8. A CNC machine tool negative pressure vacuum fixture according to claim 7, characterized in that: The cross-section of the hole wall of the first elongated hole (521) and the second elongated hole (121) is an arc-shaped concave shape.

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