阅读说明：本技术 一种穿孔真空压紧表面工作台 (Perforation vacuum compaction surface workbench ) 是由 徐小林 张晓余 伍荣林 于 2020-11-25 设计创作，主要内容包括：本发明公开一种穿孔真空压紧表面工作台,包括：工作台面,所述工作台面的顶部铺设有片材,且片材开设有若干组等距分布的片材穿孔；支撑架,四组所述支撑架的分别位于所述工作台面的两侧且相互对称,所述支撑架的顶部均焊接有齿条；机架,所述机架位于所述齿条的上表面,所述机架靠近所述齿条的两端底部安装有与所述齿条相互适配的驱动组件,所述机架的内部转动连接有螺纹杆,且螺纹杆上螺纹连接有滑动块,所述机架的内部设有用于提高滑动块稳定的滑杆,且滑杆与所述螺纹杆相互平行,所述驱动组件的输出轴与所述螺纹杆的输入端固定连接,主要方面在于控制穿过工作台的孔数和孔直径的密度,以便最大化真空系统在压下工件材料方面的效率。(The invention discloses a perforating vacuum compacting surface workbench, which comprises: the top of the working table is paved with sheets, and the sheets are provided with a plurality of groups of sheet perforations distributed at equal intervals; the four groups of support frames are respectively positioned on two sides of the working table surface and are mutually symmetrical, and racks are welded on the tops of the support frames; the frame, the frame is located the upper surface of rack, the frame is close to the both ends bottom of rack install with the drive assembly of the mutual adaptation of rack, the inside of frame rotates and is connected with the threaded rod, and threaded connection has the sliding block on the threaded rod, the inside of frame is equipped with and is used for improving the stable slide bar of sliding block, and the slide bar with the threaded rod is parallel to each other, drive assembly's output shaft with the input fixed connection of threaded rod, the main aspect lies in the density of the hole number and the hole diameter that control passed the workstation to maximize vacuum system is at the efficiency of pushing down in the aspect of the work piece material.)

1. A perforated vacuum hold down surface table, comprising:

the sheet punching machine comprises a working table top (24), wherein sheets (20) are laid on the top of the working table top (24), and a plurality of groups of sheet punching holes (22) which are distributed at equal intervals are formed in the sheets (20);

the four groups of support frames (12) are respectively positioned on two sides of the working table top (24) and are mutually symmetrical, and racks (16) are welded on the tops of the support frames (12);

the rack (50) is positioned on the upper surface of the rack (16), a driving assembly (52) matched with the rack (16) is mounted at the bottom of the two ends, close to the rack (16), of the rack (50), a threaded rod (54) is rotatably connected inside the rack (50), a sliding block (58) is connected to the threaded rod (54) in a threaded mode, a sliding rod (56) used for improving stability of the sliding block (58) is arranged inside the rack (50), the sliding rod (56) is parallel to the threaded rod (54), and an output shaft of the driving assembly (52) is fixedly connected with an input end of the threaded rod (54);

a cutter assembly (60), the cutter assembly (60) is fixedly connected to the outer end of the sliding block (58) through a tightening band, and the cutter assembly (60) comprises a cutter (65).

2. A perforated vacuum compacting surface table according to claim 1, characterized in that: four groups of supporting legs (10) are symmetrically arranged at four corners of the bottom of the working table top (24).

3. A perforated vacuum compacting surface table according to claim 1, characterized in that: a plenum (30) is mounted to a bottom surface of the countertop (24), the plenum (30) including a plenum chamber and a vent assembly.

4. A perforated vacuum compacting surface table according to claim 4, characterized in that: the bottom of the plenum (30) is communicated with a vacuum machine (40) through a pipeline.

5. A perforated vacuum compacting surface table according to claim 1, characterized in that: the sheet (20) has at least twenty groups of inner sheet perforations (22), and the sheet perforations (22) include a bottom major surface (26) and a perforated wall (28).

6. A perforated vacuum compacting surface table according to claim 1, characterized in that: the driving assembly (52) comprises a first servo motor and a second servo motor, an output shaft of the first servo motor is in transmission connection with an input end of the threaded rod (54), and the second servo motor is in meshing connection with the rack (16) through a gear.

7. A perforated vacuum compacting surface table according to claim 1 or 4, characterized in that: and a controller (68) is arranged outside one side of the working table top (24), and the output end of the controller (68) is electrically connected with the input ends of the plenum (30), the vacuum machine (40) and the driving assembly (52) respectively.

8. A perforated vacuum compacting surface table according to claim 1, characterized in that: the model of the vacuum machine (40) is DZ-400; the cutter (65) is HD 45A.

Technical Field

The invention relates to the technical field of perforation vacuum compaction surfaces, in particular to a perforation vacuum compaction surface workbench.

Background

In operation, the vacuum hold-down system provides a reduced pressure on the bottom side of the perforated plate. When a piece of work piece material is placed on the top side of the perforated plate, the vacuum pulls the sheet work piece material down onto the table and acts to resist lateral movement of the work piece across the table even under the influence of the forces generated by the cut. In my known prior art, a retaining surface for a fabric and an impermeable sheet such as leather comprise a straight row of relatively evenly spaced holes, wherein the average diameter of the holes is about 0.013 inch, and the holes between the centers of the holes are about 0.048 inch, and the wall thickness between adjacent holes is about 0.035 inch. The spacing between the perforation lines is about 0.5 inches.

Prior art vacuum systems having evenly distributed holes waste some of the available vacuum because most of the holes are not covered by the workpiece.

In prior art vacuum surface sheets, the perforated sheet tends to fail under the influence of the downward pressure of the cutting tool. Failures typically occur along the lines of spaced holes, for which a perforated vacuum compacting surface table is proposed.

Disclosure of Invention

The present invention is directed to a vacuum-through-hole surface platen, which solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a perforated vacuum hold down surface table comprising:

the top of the working table is paved with sheets, and the sheets are provided with a plurality of groups of sheet perforations distributed at equal intervals;

the four groups of support frames are respectively positioned on two sides of the working table surface and are mutually symmetrical, and racks are welded on the tops of the support frames;

the rack is positioned on the upper surface of the rack, the bottoms of the two ends of the rack, which are close to the rack, are provided with driving assemblies which are matched with the rack, the interior of the rack is rotatably connected with a threaded rod, a sliding block is connected onto the threaded rod in a threaded manner, a sliding rod for improving the stability of the sliding block is arranged in the rack, the sliding rod is parallel to the threaded rod, and an output shaft of the driving assembly is fixedly connected with an input end of the threaded rod;

the cutter assembly, cutter assembly through lock hoop fixed connection in the outer end of sliding block, cutter assembly includes the cutterbar.

The invention is further preferred: four groups of supporting legs are symmetrically arranged at four corners of the bottom of the working table.

The invention is further preferred: the bottom surface of the countertop is equipped with a plenum that includes a plenum chamber and a vent assembly.

The invention is further preferred: the bottom of the pressure ventilation system is communicated with a vacuum machine through a pipeline.

The invention is further preferred: the sheet has at least twenty inner sheet perforations and the sheet perforations include a bottom major surface and a perforated wall.

The invention is further preferred: the driving assembly comprises a first servo motor and a second servo motor, an output shaft of the first servo motor is in transmission connection with an input end of the threaded rod, and the second servo motor is in meshed connection with the rack through a gear.

The invention is further preferred: the controller is arranged outside one side of the working table, and the output end of the controller is electrically connected with the input ends of the pressure ventilation system, the vacuum machine and the driving assembly respectively.

The invention is further preferred: the model of the vacuum machine is DZ-400; the cutter is a type HD45A pizza cutter.

Compared with the prior art, the invention has the beneficial effects that:

1. a first main aspect of the invention is to control the number of holes through the table and the density of hole diameters in order to maximize the efficiency of the vacuum system in depressing the workpiece material, which aspect involves the arrangement of large scale holes.

2. The present invention relates to the geometric arrangement of perforations or holes in a vacuum surface, this aspect relates to the arrangement of holes on a small scale, describing hole arrangements and patterns which reduce the likelihood of cracking of the table surface, thereby increasing the useful life of the table, in one embodiment the holes are provided on a curve rather than a straight line. In another embodiment, the holes are arranged with a controlled average hole pitch.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic of the sheet structure of the present invention;

fig. 3 is an enlarged view of a portion of fig. 1 of the present invention.

In the figure: 10. a support leg; 12. a support frame; 16. a rack; 20. a sheet material; 22. perforating the sheet; 24. a work table; 26. a bottom major surface; 28. a perforated wall; 30. a plenum; 40. a vacuum machine; 50. a frame; 52. a drive assembly; 54. a threaded rod; 56. a slide bar; 58. a slider; 60. a cutter assembly; 65. a cutter; 68. and a controller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

the present invention provides a perforated vacuum compacting surface table as shown in fig. 1-3, comprising:

the sheet material punching device comprises a worktable surface 24, wherein the sheet material 20 is laid on the top of the worktable surface 24, and the sheet material 20 is provided with a plurality of groups of sheet material punching holes 22 which are distributed at equal intervals;

the four groups of support frames 12 are respectively positioned on two sides of the working table surface 24 and are mutually symmetrical, and racks 16 are welded on the tops of the support frames 12;

the rack 50 is positioned on the upper surface of the rack 16, the bottom of the rack 50, which is close to the two ends of the rack 16, is provided with a driving component 52 which is matched with the rack 16, the inside of the rack 50 is rotatably connected with a threaded rod 54, the threaded rod 54 is in threaded connection with a sliding block 58, the inside of the rack 50 is provided with a sliding rod 56 for improving the stability of the sliding block 58, the sliding rod 56 is parallel to the threaded rod 54, and the output shaft of the driving component 52 is fixedly connected with the input end of the threaded rod 54;

a cutter assembly 60, wherein the cutter assembly 60 is fixedly connected to the outer end of the sliding block 58 through a tightening band, and the cutter assembly 60 comprises a cutter 65.

In the embodiment of the present invention, specifically: four groups of supporting legs 10 are symmetrically arranged at four corners of the bottom of the working table surface 24.

In the embodiment of the present invention, specifically: the bottom surface of the countertop 24 is fitted with a plenum 30, the plenum 30 comprising a plenum chamber and a vent assembly.

In the embodiment of the present invention, specifically: the bottom of the plenum 30 is piped to a vacuum 40.

In the embodiment of the present invention, specifically: the sheet 20 has at least twenty groups of interior sheet perforations 22, and the sheet perforations 22 include a bottom major surface 26 and perforated walls 28.

In the embodiment of the present invention, specifically: the driving assembly 52 includes a first servo motor and a second servo motor, an output shaft of the first servo motor is in transmission connection with an input end of the threaded rod 54, and the second servo motor is in meshing connection with the rack 16 through a gear (not shown in the figure).

In the embodiment of the present invention, specifically: a controller 68 is provided on the exterior of one side of the work surface 24, and the output of the controller 68 is electrically connected to the input of the plenum 30, the vacuum machine 40, and the drive assembly 52, respectively (not shown).

In the embodiment of the present invention, specifically: the model of the vacuum machine 40 is DZ-400; the cutter 65 is of the type HD 45A.

Fig. 1 shows, in schematic form, a vacuum table of the type used for processing sheets such as cloths and leather. The table includes a support structure, such as legs 10, the table itself includes a countertop 24, the countertop 24 being the top surface of the sheet 20, which is substantially air impermeable. The sheet 20 includes a plurality of holes or sheet perforations 22, the holes or sheet perforations 22 passing through the thickness of the sheet and connecting a top countertop 24 of the sheet 20 of sheet with a bottom major surface 26 of the sheet 20. Below the surface sheet 20. The plenum 30 is connected to a vacuum machine 40, which is effectively sealed to the bottom major surface 26 of the table sheet 20. The vacuum system reduces the pressure in the plenum 30 to below ambient or atmospheric pressure. This causes air to flow through the sheet perforations 22, and the pressure differential between the air flow through the sheet perforations 22 and the sheet 20 creates a downward force on the sheet-like workpiece material placed on the table between the table top 24 and the bottom major surface 26, and the downward force acts to resist movement of the workpiece on the table.

The frame 50 in fig. 1 is a frame 50 adapted to move relative to the table and a cutter assembly 60 mounted on the frame 50, the frame 50 being adapted to be more numerous relative to the frame 50. The combination of carriage motion and cutter motion provides X and Y motion of the cutter assembly 60 allowing the cutter assembly 60 to cut the sheet material in a manner controlled by the cutter motion and carriage motion. Cutter knife assembly 60 also provides rotational movement of the cutter about the Z axis, perpendicular to the X and Y axes, so that the cutter can be oriented in the direction of the desired cut. The cutter 65 may be a single-edged blade or a rotating disk with a sharp edge (pizza cutter). In practice, the movement of the cutter knife assembly 60 and the carriage 50 is controlled by a controller 68,

the surface sheet of the table may be made of various materials. The main requirement is that the material is substantially impermeable to air. In a typical table for cutting cloth and leather I use a material that is polypropylene with a thickness of about 0, 2 inches. Other plastic materials may be used for the table top. Also in practice, in the case of larger table tops, a skeletal support structure (not shown) is provided within the vacuum chamber to support the surface sheet at multiple points over its area in order to minimize sheet deflection under the action of the vacuum.

Fig. 2 shows a cross section of the surface sheet 20, which comprises a cross section of the sheet perforation 22 through the surface sheet 20. The sheet perforation 22 is defined by a surface perforation wall 28, the surface perforation wall 28 passing from one of the countertops 24 to the other of the bottom major surfaces 26 of the face sheet 20. The cross-section of the sheet perforation 22 may be circular, or may have any other cross-section. The tables produced by the assignee of the present invention have oval shaped holes. When non-circular holes are used, the term effective diameter will be used to define non-circular holes in terms of circular holes of equal area. The holes may be created by laser drilling or any other suitable technique.

The sheet perforations 22 have an effective diameter of about 0, 0008 to 0, 030 inches. Holes less than about 0, 0008 inches in diameter are prone to clogging by dust and debris from the cutting operation, while holes greater than about 0, 030 inches are undesirable because they interfere with the movement of the cutting tool.

Vacuum table technical field the present invention relates to vacuum tables for cutting sheets such as cloth and leather. The cutter 65 is mounted in the cutter assembly 60 shown in fig. 1. During the cutting operation, a rotating sharp cutting wheel or non-rotating stationary knife presses down on the countertop 24 of the face sheet 20. The cutter 65 is forced against the table top 24 to completely cut the workpiece sheet material. In past practice it has been found that prior art facesheets 20 are prone to failure by rupturing along the perforation lines shown in fig. 1. Such cracks are obviously caused by the knife pressing against the table.

A common use of vacuum tables with cutting devices and vacuum tables is as mentioned before in leather cutting. Previously used vacuum table designs have had a constant hole density (measured in holes per square foot) across their surface, where hole density is the number of holes per unit area multiplied by the cross-sectional area of the holes, or summed hole area in a unit area of the surface.

A higher density of holes produces a greater downward force on the workpiece for a given pressure differential across the surface. While higher down forces are generally required in the workpiece area, i prefer to have at least 3 pounds per square foot and preferably at least 5 pounds per square foot of down force on the workpiece. However, if the hole density is high over the entire surface, the vacuum system may be overloaded; of course, increases power consumption and noise levels.

In prior art constant hole density gauges, it is common practice to place a plastic sheet on the portion of the table that is not covered by the workpiece, but this increases material and labor costs.

According to the invention, a vacuum table surface is produced having at least two regions. The size and shape of at least one region (inner or workpiece region) corresponds substantially to the size and shape of the workpiece to be machined. The hole density of the workpiece region is greater than the balanced hole density of the table. Preferably, the density of holes in the workpiece region is at least about 20% greater than the density of holes in the remainder of the working region.

The downward force generated by the vacuum table is approximately proportional to the hole density (assuming a constant pressure differential across the table). Thus, the present invention may also be described in terms of the difference in downward force on the workpiece in different areas on the table. The average downforce per unit area on the workpiece is greater than the average downforce observed on the workpiece outside the workpiece in an area of the workpiece that generally corresponds to the size and shape of the intended workpiece. And (4) a zone. Preferably, the downward force is at least about 20% greater for the workpiece (area) than in other areas of the table surface.

When a workpiece such as a cow leather is placed on a vacuum table in preparation for cutting, it is common practice to cover the edges of the cow leather with thin plastic strips of material known in the art as "plastic cover". The purpose of the plastic strip is to seal the leather perimeter to the vacuum table and prevent air leakage between the irregular leather contour surface and the flat vacuum table surface.

The present invention includes providing a vacuum compaction table for use with irregularly shaped products, such as leather, wherein the table work surface includes at least one work piece area having a particular density and hole spacing, wherein the work piece area will be the majority of the area. Covered by the workpiece to be cut. Rather, the size and shape of the workpiece region is such that most of the intended workpiece will be located in the workpiece region. There is another region, the outer region, which has a reduced density and hole spacing relative to the central region. There may also be one or more intermediate regions between the inner and outer regions.

The electrical components in the document are all electrically connected with an external main controller and 220V mains supply, and the external main controller can be a conventional known device controlled by a computer and the like.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.