JP2012152861A - Vacuum suction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum suction device that can readily suction a large workpiece material having a large warp, and to secure a holding force endurable with machining stress.SOLUTION: The vacuum suction device includes: a first engagement member 15 configured to advance and retreat relative to a workpiece 30 and engaged with a surface of the workpiece by decompression or adhesion; and a second engagement member 17 formed in such a shape that encircles the first engagement member and engaged with an outer circumference of the part engaged by the first engagement member in the workpiece by decompression.

Description

  The present invention relates to a vacuum suction device that can be preferably used when, for example, a workpiece having a large strain is fixed on a processing table.

For example, when a workpiece is a large material, such as an insulating material for a transformer, and the surface of the workpiece has small irregularities, the desired processing accuracy is obtained when the processing device cuts or cuts the material. For this reason, a plurality of vacuum suction devices arranged on the processing table portion of the processing device can be used to lock the workpiece in a state in which the distortion of the workpiece is corrected, and due to the locking force that can withstand the processing stress, misalignment due to processing stress. Need to prevent. In particular, when a material having small irregularities on the surface of the workpiece or a material that causes irregularities is to be locked, a synthetic rubber or the like that is an elastic body is often used at the contact portion with the workpiece. . The locking force that can withstand the processing stress at this time depends on the area of the opening hole such as a synthetic rubber that is a contact portion with the workpiece and the vacuum pressure.
In order to hold a material with a large strain by a vacuum suction device, for example, as in Patent Document 1, after using a structure to press the workpiece against the processing table or suction portion of the processing device, the strain is corrected. And held by a vacuum suction device. Alternatively, for example, as in Patent Document 2, the suction part of the vacuum suction device that can be freely tilted within a predetermined range is raised to lower the suction part after the workpiece is reliably sucked, and the workpiece Is pressed against the processing table of the processing device to correct the distortion.

JP 2006-136897 A (first page, FIGS. 1 to 3) Japanese Patent Laid-Open No. 10-86086 (first page, FIG. 3)

For example, when a large-sized material having a large strain, such as an insulating material for a transformer, is cut or cut by a processing device, a workpiece is used as a processing table of the processing device using a structure as in Patent Document 1. Alternatively, in the method of correcting the distortion by pressing against the suction part and holding it with a vacuum suction device, when the work piece is processed, if the structure remains on the work piece, the work is hindered. It is necessary to evacuate from the object. Therefore, there is a problem that the processing apparatus becomes large and has a complicated structure.
Further, as in Patent Document 2, when the work piece is adsorbed by raising the adsorbing part of the vacuum adsorbing device that can be freely tilted within a predetermined range, the adsorbing part moves due to processing stress generated during processing, There is a problem that desired processing accuracy cannot be obtained.

  The present invention has been made in order to solve the above-described problems, and can easily engage even a large workpiece having a simple structure and a large distortion, and can be used for cutting and cutting. The purpose is to obtain a vacuum adsorption device that can withstand the processing stress of the above.

  A vacuum suction device according to the present invention is provided so as to be able to advance and retreat with respect to a workpiece, and engages the surface of the workpiece with reduced pressure or adhesion, and the first engagement member. And a second engaging member that engages the outer peripheral portion of the engaging portion of the work piece by the first engaging member by decompression. .

  In the present invention, the workpiece is engaged by the double engagement means by the first engagement member and the second engagement member surrounding the first engagement member. Even if the workpiece has distortion or deflection, it can be securely attached. For this reason, distortions such as unevenness generated in the workpiece can be corrected, and an engaging force that can withstand machining stresses such as cutting and cutting can be obtained.

It is sectional drawing which shows the principal part of the vacuum suction apparatus by Embodiment 1 of this invention, and is the state before engaging a workpiece. It is sectional drawing which shows the state which raised the 1st engaging member shown by FIG. FIG. 3 is a cross-sectional view showing a state in which the first engaging member is lowered from the state of FIG. 2 and the workpiece is engaged together with the second engaging member. It is sectional drawing which shows the principal part of the vacuum suction apparatus by Embodiment 2 of this invention. It is sectional drawing which shows the principal part of the vacuum suction apparatus by Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a main part of a vacuum suction device according to Embodiment 1 of the present invention, and the drawing shows a state in which a suction pad is lowered before sucking a workpiece. In the drawing, the vacuum suction device 10 has a plurality of circular inner peripheral surfaces 11a, 11b, 11c (11a <11b <11c) formed coaxially in a stepped cross section, and an exhaust port 11d is formed in the central inner peripheral surface 11b. A cylindrical pedestal 11 having a central portion of the pedestal 11 so as to be movable in the axial direction (vertical direction in the figure) and having an outer diameter having a gap with respect to the inner peripheral surface 11a of the pedestal 11. The hollow shaft member 12, the cylinder device 13 that moves the shaft member 12 forward and backward in the figure, and the drive shaft 13 a of the cylinder device 13 and the lower end portion of the shaft member 12 are connected to each other. A cylindrical block member 14 having a communication passage 14a for communicating the hollow portion of the block 11 with the exhaust port 11d, and an outside of the block member 14 mounted in a recess near the lower end portion of the inner peripheral surface 11b of the base 11 With an O-ring 14b for sealing between the inner circumferential surface 11b of the surface and the base 11.

  A small-diameter suction pad 15 as a first engaging member having a through hole at the center is fixed to the upper end portion of the shaft member 12. The small-diameter suction pad 15 is made of synthetic rubber, the suction surface at the upper end is formed in a dish shape whose periphery is curved upward, and the through hole in the center portion forms the first exhaust passage A communicating with the hollow portion of the shaft member 12. is doing. A large-diameter suction pad 17 as a second engaging member having a larger diameter than the small-diameter suction pad 15 is fixed to a ring-like fixing member 16 that is screwed into the upper end portion of the base 11.

  The large-diameter suction pad 17 is made of a synthetic rubber formed in a ring shape. The inner diameter of the large-diameter suction pad 17 is larger than the outer diameter of the small-diameter suction pad 15, with a predetermined gap from the outer peripheral portion of the small-diameter suction pad 15. The suction surface 17a at the upper end is formed in a dish shape whose periphery is curved upward. The fixing member 16 is formed to have the same inner diameter as the inner peripheral surface 11a of the pedestal 11, and a gap portion constituting the second exhaust path B is formed between the inner peripheral surface and the shaft outer peripheral surface of the small-diameter suction pad 15. Is formed.

  A spring 18 and a ring plate-shaped spring guide 19 are provided on the outer peripheral portion of the shaft member 12 from the upper end surface of the block member 14 to the step portion of the inner peripheral surface 11a and the inner peripheral surface 11b of the base 11. An O-ring 19a for opening and closing the second exhaust passage B at a predetermined time is mounted on a surface of the upper surface of the spring guide 19 that faces the stepped portion. Although the spring guide 19 is slidably provided with respect to the shaft member 12, when the maximum protrusion amount of the small-diameter suction pad 15 when the drive shaft 13a of the cylinder device 13 is raised may be constant, It may be fixed to the shaft member 12. Further, the second exhaust path is opened and closed by the step portion of the inner peripheral surface 11 a and the inner peripheral surface 11 b of the inner surface of the base 11, the spring 18, the spring guide 19, the O-ring 19 a, the shaft member 12, the block member 14, and the cylinder device 13. Means.

  As shown in FIG. 1, when the small-diameter suction pad 15 is lowered, the first exhaust path A and the second exhaust path B are communicated with each other in an intermediate chamber formed by the inner peripheral surface 11b. The exhaust port 11d is connected to a vacuum pump (not shown) via a vacuum pipe 20. Further, a heater 21 as a heating means for the small-diameter suction pad 15 is provided on the upper portion of the shaft member 12, and a heater 22 as a heating means for the large-diameter suction pad 17 is provided at the upper end portion of the base 11. The heaters 21 and 22 are each configured to be able to maintain a desired temperature by a temperature sensor (not shown) and a temperature control device.

  The vacuum suction device 10 configured as described above is configured to be installed inside a mounting hole 40 a provided at a predetermined position of the processing table 40 that holds the workpiece 30. The vertical suction position of the vacuum suction device 10 is such that the workpiece 30 is sucked by the small-diameter suction pad 15 and the large-diameter suction pad 17 and the workpiece 30 is processed while the small-diameter suction pad 15 is lowered. It is fixed to the processing table 40 so as to form the same plane as the surface 40b of the table 40. For example, the height of the large-diameter suction pad 17 may be finely adjusted by the screwing amount of the fixing member 16. Further, the number and interval of the vacuum suction devices 10 provided on the processing table 40 are appropriately determined according to the size and physical properties of the workpiece 30.

Next, operation | movement of the vacuum suction apparatus comprised as mentioned above is demonstrated with reference to FIGS. 2 is a cross-sectional view showing a state where the first engaging member shown in FIG. 1 is raised, and FIG. 3 is a state where the first engaging member is lowered from the state shown in FIG. It is sectional drawing which shows the state engaged with the 2nd engaging member.
First, a workpiece 30 such as an insulating paper used for an insulating portion of a large transformer for electric power, a press board, or the like, for example, several meters square or more is placed on the processing table 40. At this time, the workpiece 30 is distorted due to, for example, bending, twisting, loosening, or the entry of air at the time of placing, and irregularities are generated between the workpiece 30 and the surface 40 b of the processing table 40. The workpiece 30 in FIG. 1 schematically shows a case where the convex portions generated as described above are present in the vicinity of the vacuum suction device 10.

  Next, by raising the drive shaft 13a of the cylinder device 13, the O-ring 19a is pressurized by the reaction force of the spring 18, and the second exhaust path B, which is the vacuum path shown in FIG. Thus, the vacuum pressure obtained from the vacuum pump passes through the first exhaust path A and sucks the surrounding air through the hole in the center of the small-diameter suction pad 15. The drive shaft 13a of the cylinder device 13 is further lifted, and the shaft member 12 is lifted to such an extent that the small-diameter suction pad 15 comes into contact with the workpiece 30, whereby the workpiece 30 is moved relative to the small-diameter suction pad 15 as shown in FIG. Can be adsorbed as shown in FIG.

  After the small-diameter suction pad 15 adsorbs the workpiece 30, when the cylinder device 13 is lowered in a state where the exhaust by the vacuum pump is continued, the workpiece 30 is brought into the large-diameter suction pad immediately before the lower end of the cylinder device 13. 17 is pressed. Almost simultaneously with this timing, the O-ring 19a is released from the reaction force of the spring 18, and the blocked second exhaust passage B is opened. Until this operation is performed, since the spring guide 19 is in a vacuum state, the workpiece 30 can be instantaneously vacuum-sucked to the large-diameter suction pad 17 as shown in FIG.

  The second exhaust path opening / closing means functions as an electromagnetic valve that switches between two vacuum paths of the first exhaust path A and the second exhaust path B by the vertical drive of the cylinder device 13 and the operation of the spring 18 and the O-ring 19a. Plays. Further, the height of the suction surface of the small-diameter suction pad 15 in the state of FIG. 3 is the suction surface when the workpiece 30 is vacuum-sucked by the upper surface 40b of the processing table 40 and the large-diameter suction pad 17. The distortion of the workpiece 30 can be corrected by being arranged so as to be the same height as the height.

  Note that the large-diameter suction pad 17 and the small-diameter suction pad 15 are respectively fixed by the heater 22 with a temperature control function attached to the base 11 and the heater 21 with a temperature control function attached to the shaft member 12. Keep above temperature. This is to prevent the synthetic rubber that is the material of the suction pad from being cured, that is, to reduce the elastic properties due to the influence of changes in the temperature environment such as the temperature. By keeping the temperature of the suction part constant, the suction pad The elastic properties of synthetic rubber, which is the material of, are stabilized. As a result, a stable adsorption state can be obtained.

  As described above, according to the first embodiment, the small-diameter suction pad is a first engaging member that is provided so as to be capable of advancing and retreating with respect to the workpiece 30 and that engages the surface of the workpiece 30 by decompression. The large-diameter suction pad 17, which is a second engaging member for disposing the outer peripheral portion of the engaging portion by the small-diameter suction pad 15 in the workpiece 30 by decompression, is disposed in the center portion. Since the suction pad 15 is integrally disposed around the outer periphery so as to surround the suction pad 15, the small-diameter suction pad 15 plays a role of easily sucking a portion with a large distortion of the workpiece 30, and processing stress generated during processing. Since the large-diameter suction pad 17 plays a role of securing a holding force that can withstand the load, the role is effectively shared, and even if the workpiece 30 is distorted or bent, it can be securely engaged. For this reason, it is possible to surely adsorb the workpiece 30 which is large and has a large distortion in a state in which the distortion is corrected, and to obtain an engaging force which can withstand a processing stress such as cutting and cutting.

  Further, as a result of obtaining the above effect, workability is remarkably improved. For this reason, shortening of working time and saving of energy consumption can be expected. Furthermore, since the heaters 21 and 22 that can heat the small-diameter suction pad 15 and the large-diameter suction pad 17 to a predetermined temperature as necessary are provided, the suction pad is affected by the temperature environment change such as the air temperature. In addition, it is possible to prevent a phenomenon in which the elastic characteristics are deteriorated and always maintain a stable adsorption state with respect to the uneven shape on the surface of the workpiece without being affected by changes in the temperature environment such as the air temperature.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view showing the main part of the vacuum suction device according to Embodiment 2 of the present invention. In addition, this Embodiment 2 is replaced with the silicone gel using adhesive force instead of the small-diameter suction pad 15 using reduced pressure in Embodiment 1 as the first engaging member for engaging the workpiece. An adhesive block is used. In the drawing, the shaft member 12A is formed in a solid round bar shape, and an adhesive block 15A for fixing the surface of the workpiece 30 is fixed to the tip of the shaft member 12A. The adhesive block 15A is obtained by baking a silicone gel on the surface of a metal material.

  Note that the spring 18, the spring guide 19, the O-ring 19a and the like in FIG. 1 of the first embodiment are omitted, and thus the second exhaust path opening / closing means is also omitted. Further, the communication member 14a shown in FIG. 1 is omitted from the block member 14A. Furthermore, the heater 21 is also omitted. Further, the position of the upper end of the adhesive block 15A when the drive shaft 13a of the cylinder device 13 is lowered to the lower end is configured to be at the same level as the surface 40b of the processing table 40 as in the first embodiment. ing. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In the second embodiment configured as described above, by raising the drive shaft 13a of the cylinder device 13, the adhesive block 15A attached to the tip of the shaft member 12A rises, and the adhesive block 15A has an adhesive property. A certain silicone gel surface is brought into contact with and engaged with the surface (back surface) of the workpiece 30. Thereafter, the workpiece 30 is vacuum-sucked by the large-diameter suction pad 17 by lowering the drive shaft 13 a of the cylinder device 13. Silicone gels are those that maintain repeated adhesiveness, and when the adhesiveness is reduced due to adhesion of dirt or the like, the adhesiveness is recovered by washing with water or ethanol. In addition, as long as it has the same adhesiveness, materials other than silicone gel may be used. The vacuum path required in the second embodiment is only one path corresponding to the second exhaust path B in the first embodiment.

  As described above, according to the second embodiment, a large-sized workpiece having a large distortion is securely engaged in a state in which the distortion is corrected, as in the first embodiment, and cutting and cutting are performed. It is also possible to maintain a holding force that can withstand the machining stress. Further, since the configuration is simple, it can be provided at a low cost. Needless to say, the same effects as those of the first embodiment can be obtained with respect to changes in temperature. If desired, a heater 22 similar to that of the first embodiment may be added.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view showing the main part of the vacuum suction device according to Embodiment 3 of the present invention. In the figure, a vibration motor 23 which is a vibration means for vibrating the large-diameter suction pad 17 is provided at the upper end of the base 11. In this example, the heater 22 shown in FIG. 1 is not installed. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In the third embodiment configured as described above, when the workpiece 30 (not shown) is vacuum-sucked to the large-diameter suction pad 17, the vibration motor 23 operates to vibrate the large-diameter suction pad 17. Let As described above, when the large-diameter suction pad 17 is engaged with the workpiece 30 while being vibrated, the surface of the workpiece 30 is not dependent on the uneven state as compared with a case where the pad is simply pressed against the surface of the workpiece 30. The suction part of the large-diameter suction pad 17 becomes easy to become familiar with. Further, if the adsorption portion is cured due to a decrease in temperature environment of about 20 ° C. to 30 ° C., an effect equivalent to the effect of the heater 22 with a temperature adjusting function can be obtained. In order to prepare for a low temperature environment, a heater 22 similar to that of the first embodiment may be added if desired.

  In addition, for example, the shape and fixing structure of the small-diameter suction pad 15, the adhesive block 15A, and the large-diameter suction pad 17 exemplified in the first to third embodiments, and the formation method of the first exhaust passage A and the second exhaust passage B. The structure, the structure of the second exhaust passage opening / closing means, the structure of the pedestal 11, the installation position of the heaters 21 and 22, etc. are merely one form for carrying out the present invention, and various modifications are possible within the scope of the present invention. Needless to say, modifications and changes are possible. Moreover, it is natural that the shape and configuration of the processing table 40, the type and size of the workpiece 30, the purpose, and the vertical relationship are not limited to those exemplified in this document.

  DESCRIPTION OF SYMBOLS 10 Vacuum adsorption device, 11 base, 11a, 11b, 11c Inner peripheral surface, 11d Exhaust port, 12, 12A Shaft member, 13 Cylinder device, 13a Drive shaft, 14 Block member, 14a Communication path, 14b O-ring, 15 Small bore Suction pad (first engaging member), 15A adhesive block (first engaging member), 16 fixing member, 17 large-diameter suction pad (second engaging member), 17a suction surface, 18 spring, 19 spring Guide, 19a O-ring, 20 Vacuum piping, 21, 22 Heater, 23 Vibration motor (vibration means), 30 Workpiece, 40 Processing table, 40a Mounting hole, 40b Surface, A 1st exhaust path, B 2nd exhaust path .

Claims (6)

  A first engaging member which is provided so as to be capable of advancing and retreating with respect to the workpiece, and which engages the surface of the workpiece with reduced pressure or adhesion, and is formed so as to surround the first engaging member; And a second engaging member for engaging the outer peripheral portion of the engaging portion of the workpiece with the first engaging member by decompression.   The first engaging member is driven by a cylinder in the advancing / retreating direction, is fixed to a distal end portion of a hollow shaft member constituting the first exhaust passage, and includes a small-diameter suction pad having a through hole in the center portion, 2. The vacuum according to claim 1, wherein the second engaging member includes a large-diameter suction pad provided through a gap constituting the second exhaust path with respect to the outer peripheral surface of the shaft member. Adsorption device.   Second exhaust path opening / closing means for opening and closing the second exhaust path in conjunction with the advance and retreat of the cylinder is provided, and the second exhaust path opening / closing means is closed when the cylinder is advanced relative to the workpiece. The surface of the workpiece is engaged with the small-diameter suction pad, and when the cylinder is retracted, the second exhaust passage opening / closing means is opened so that the surface of the workpiece is attracted to the small-diameter suction pad. 3. The vacuum suction device according to claim 2, wherein the large-diameter suction pad is used for engaging with the pad.   2. The vacuum suction device according to claim 1, wherein the first engaging member is composed of an adhesive block fixed to a tip portion of a shaft member driven in a forward / backward direction by a cylinder.   The vacuum suction device according to any one of claims 1 to 4, further comprising heating means for heating the first engaging member and the second engaging member to a predetermined temperature. .   The vacuum suction device according to any one of claims 1 to 5, further comprising vibration means for vibrating the second engaging member.

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