JP2007083354A - Work sucking and retaining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work sucking and retaining device with improved work sucking and retaining force. <P>SOLUTION: This work sucking and retaining device 1 is composed of: a seal material 8 annularly disposed at a suction surface 2 for sucking a work W and brought into close contact with the work W during suction of the work W; a suction port 9 formed in a range surrounded by the seal material 8 of the suction surface 2; a cylinder 7 communicated with the suction port 9 and a cylinder head 15 or near them; a piston 4 airtightly incorporated into the cylinder 7; a piston rod 5 of which one edge is jointed with the piston 4 and in which a male screw groove 22 is formed at an outer periphery; a female screw portion 32 fixedly provided at the cylinder on the cylinder 7 opening side and screwed in the piston rod; and an operation part 24 which operates rotation of the piston rod. The piston 4 is moved in the direction separating from the cylinder head 15, and a negative pressure is generated in the cylinder and in the range surrounded by the seal material of the suction surface, thus sucking and retaining the work W at the suction surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a work suction holding device for sucking and holding a work.

  Conventionally, in machine tools such as a lathe, a milling machine, a machining center, a drilling machine, and a plane cutting machine, the work is fixed by a work holding device that holds the work. As a workpiece holding device, for example, a mechanical workpiece holding device that mechanically clamps and holds a workpiece is known.

Also known is a vacuum type workpiece holding device that places a workpiece on a jig and draws a vacuum between the workpiece and the chuck's suction surface using a suction pump, etc. It has been. Japanese Patent Laid-Open No. 11-129440 discloses a vacuum-type work suction / holding device that does not use a suction pump, which is provided with a spring that generates an elastic reaction force in the direction of moving the piston away from the cylinder head. . This work suction holding device moves the piston to the piston head side by operating the operation lever, and then when the work is placed on the suction surface and the operation lever is released, the piston is moved to the cylinder head by the elastic reaction force of the spring. The negative pressure is generated in the cylinder chamber by moving away from the workpiece, and the workpiece is sucked and held on the suction surface by this negative pressure.
Japanese Patent Laid-Open No. 11-129440

  In the above-described mechanical work holding device, the clamped portion may damage the work, cause distortion, or may interfere with work. Further, since the vacuum type work holding device requires a suction pump, power is always required to maintain the work suction and holding, and the running cost is increased. Further, the force for attracting and holding the work is also limited because it depends on the output of the suction pump. Further, in the workpiece suction and holding device disclosed in Japanese Patent Application Laid-Open No. 11-129440, the negative pressure is generated by moving the piston by the elastic reaction force of the spring, but the magnitude of the negative pressure is generated by the elastic reaction force of the spring. Is decided. For this reason, there is a limit to the adsorption force for holding the workpiece, and there has been a problem that a sufficient holding force cannot be obtained when used for machining such that a large force is applied to the workpiece.

A workpiece suction holding device according to the present invention includes a suction port formed on a suction surface for sucking a workpiece, and a plurality of rectangular grooves of different sizes formed on the suction surface so as to surround the suction port. , a seal member is disposed detachably on the plurality of grooves, and the suction port, a cylinder which communicates in the vicinity of the cylinder head or the cylinder head, a piston was charged in an air-tight in the cylinder, the piston operation is connected at one end, a piston rod to form a male screw groove on the outer circumference, at the opening side of the cylinder, fixedly provided in the cylinder, and the internal thread portion screwed to the piston rod, the rotation of the piston rod And an operation unit to perform.

  Also, the piston and the piston rod are connected with a connecting structure that allows the piston rod to rotate relative to the piston, and when the piston rod is operated to rotate, the piston moves together with the piston rod in the cylinder. You may make it slide without rotating.

  This workpiece suction holding device, when sucking and holding the workpiece, with the piston moved to the cylinder head side, the workpiece is placed on the suction surface, closely contacted with the sealing material, and the piston rod is rotated, Move the piston away from the cylinder head. Thereby, a negative pressure can be generated in the area surrounded by the sealing material in the cylinder and the suction surface, and the work can be sucked and held on the suction surface. At this time, the male thread groove formed on the outer periphery of the piston rod and the female thread portion are screwed into the cylinder on the opening side of the cylinder, and the piston is moved forward and backward by rotating the piston rod. It has become. Thereby, the piston can be moved within the allowable range in the cylinder, and the suction holding force for sucking and holding the workpiece can be improved only by moving the piston away from the cylinder head. The workpiece can be held with a strong suction holding force enough to withstand machining. In addition, since the movement of the piston is restricted by the threaded engagement between the piston rod and the female thread provided on the cylinder opening side, no other power is required, such as a suction pump, even if the workpiece is held by suction. Economical.

  Further, when the piston rod is rotated, the piston and the cylinder can be prevented from being worn by sliding the piston without rotating in the cylinder.

  Hereinafter, a workpiece suction holding device according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the member and site | part which show | plays the same effect | action.

  As shown in FIG. 1, the workpiece suction and holding device 1 includes a cylinder body 3 having a suction surface 2 that holds and holds a workpiece W on one side surface, a piston 4, a piston rod 5, and a nut 6 as a female screw portion. It is composed of

  In this embodiment, as shown in FIG. 3, the cylinder main body 3 is a rectangular parallelepiped block-like member in which a cylindrical cavity that becomes the cylinder 7 is formed in the length direction. Surface 2 is provided. The cylinder body 3 needs to be strong enough not to be deformed by atmospheric pressure when the inside of the cylinder 7 formed inside is made negative pressure. In this embodiment, in consideration of strength and weight reduction, an aluminum alloy ( For example, it is formed by A-7075).

The suction surface 2 is provided with an annular sealing material 8 that comes into close contact with the workpiece W when the workpiece W is sucked, and forms a suction port 9 that sucks air in an inner region surrounded by the sealing material 8. . In this embodiment, the sealing material 8 is composed of an O-ring and is mounted in a mounting groove 10 formed on the suction surface 2. As shown in FIG. 2, the mounting groove 10 has three rectangular mounting grooves 10 a, 10 b, and 10 c having different sizes so as to surround the suction port 9 formed at the center of the suction surface 2. Forming. The sealing material 8 is mounted by selecting one of the three mounting grooves 10a, 10b, and 10c in accordance with the size of the attracted surface W1 of the workpiece W to be attracted. In the illustrated example, the sealing material 8 is fitted into the second mounting groove 10b in the middle according to the attracted surface W1 of the workpiece W. The mounting grooves 10 a, 10 b, and 10 c may be set to have a width and a depth so that the sealing material 8 protrudes slightly from the suction surface 2 when an O-ring as the sealing material 8 is fitted. In this embodiment, as shown in FIG. 2, a groove 11 is formed which passes through the suction port 9 of the suction surface 2 and crosses the inner mounting grooves 10c and 10b and extends to the outer mounting groove 10a. Yes. The groove 11 smoothly sucks air when sucking air from a suction port 9 in a region surrounded by the workpiece W and the sealing material 8. In this embodiment, the mounting grooves 10a, 10b, and 10c are formed in triplicate, and the seal material 8 is mounted in any of the mounting grooves according to the attracted surface W1 of the workpiece W. The number and shape of the mounting grooves formed on the suction surface are not limited to the above embodiment.

  As shown in FIG. 3, the cylinder body 3 forms a bottomed cylindrical hole that becomes the cylinder 7 from one side surface 12 in the length direction, and a hollow hole 14 through which the piston rod 5 is inserted on the other side surface 13. Forming. The fool hole 14 is formed concentrically with the hole to be the cylinder 7 and penetrates a flaw hole that is slightly larger than the outer diameter shape of the piston rod 5. A cylinder head 15 is attached and sealed to a side surface 12 having a hole to become the cylinder 7.

  In this embodiment, as shown in FIG. 1, a communication passage 16 is formed in the cylinder body 3 for communicating the suction port 9 in the vicinity of the cylinder head 15 of the cylinder 7. The communication passage 16 is parallel to the axial direction of the cylinder 7 so as to communicate with the first passage 16a formed from the suction port 9 to a predetermined depth and the first passage 16a from the side surface 12 on the side of the cylinder body 3 where the cylinder head 15 is attached. The second passage 16b formed in the above and the third passage 16c formed obliquely so as to communicate with the second passage 16b from the inner surface on the cylinder head 15 side of the cylinder 7 are sequentially formed and communicated. On the side surface 12 of the cylinder body 3, a sealing material 17 is embedded in a portion where the second passage 16b is opened to seal the second passage 16b.

  As shown in FIG. 3, the cylinder head 15 is attached to one side surface 12 of the cylinder body 3, and includes a protrusion 18 inserted into the cylinder 7 on the inner side surface. An O-ring 19 is attached to the outer peripheral surface of the protrusion 18 to ensure the airtightness of the cylinder 7. As shown in FIG. 1, the cylinder head 15 is fixed to the side surface 12 of the cylinder body 3 with bolts 20 with the protrusions 18 inserted into the cylinder 7.

  The piston 4 is hermetically inserted into the cylinder 7 of the cylinder body 3. In this embodiment, as shown in FIG. 1 or FIG. 3, the substantially cylindrical member corresponding to the inner peripheral surface of the cylinder 7. Thus, the sealing material 21 that is in airtight contact with the inner peripheral wall 7a of the cylinder 7 is mounted on the outer periphery thereof.

  The piston rod 5 has one end connected to the piston 4 and a male thread groove 22 formed on the outer periphery. In this embodiment, as shown in FIG. 1 or FIG. 3, the piston rod 5 is formed of a round bar, and has a male thread groove 22 on substantially the entire circumference of the outer peripheral surface. One end of the piston rod 5 is provided with a connecting portion 23 connected to the piston 4, and the other end is provided with an operation portion 24 for operating the rotation of the piston rod 5. In this embodiment, a polygonal engagement structure 25 for engaging a commercially available torque wrench 26 is formed at the other end of the piston rod 5 as the operation portion 24, and the torque wrench 26 is used as a handle as shown in FIG. The piston rod 5 is appropriately attached so that the piston rod 5 can be rotated.

  Further, in this embodiment, the piston 4 and the piston rod 5 are coupled with a coupling structure that allows the piston rod 5 to rotate relative to the piston 4.

  As shown in FIG. 3, the piston 4 is formed with a protrusion 27 protruding in the axial direction on the side where the piston rod 5 is attached, and an insertion hole 28 into which one end of the piston rod 5 is inserted is formed at the center. ing. A screw hole 29 for attaching the pin 31 is formed in the protrusion 27. On the other hand, the piston rod 5 is formed with a circumferentially continuous groove 30 on the outer peripheral surface of the end connected to the piston 4. Then, the piston rod 5 is inserted into the insertion hole 28 of the piston 4, and the screw hole 29 is aligned with the groove 30 formed on the outer peripheral surface of the piston rod 5, and the screw hole 29 of the piston 4 is engaged with the groove 30. A pin 31 is attached. With such a connection structure, the piston 4 is engaged with the piston rod 5 in the axial direction via the pin 31, and the piston 4 is allowed to rotate relative to the piston rod 5. Thus, the piston 4 is prevented from rotating together with the piston rod 5 in the cylinder 7 even if the piston rod 5 is rotated.

  As shown in FIG. 3, the piston 4 and the piston rod 5 are connected to each other and inserted into the cylinder 7 of the cylinder body 3 from the piston rod 5, and the piston rod 5 is inserted into the hole 14 on the side surface 13 of the cylinder body 3. And the piston 4 is mounted in the cylinder 7. Then, as shown in FIG. 1, the piston 4 is moved into the cylinder 7, the cylinder head 15 is attached to the cylinder body 3, and the cylinder 7 is sealed.

  On the opening side of the cylinder 7 (the side where the hollow hole 14 is formed), a female screw portion 32 that is screwed into the cylinder body 3 and the piston rod 5 is fixedly provided. In this embodiment, as shown in FIG. 1, the hollow hole 14 formed in the cylinder body 3 becomes the opening of the cylinder 7, and the nut 6 as the female screw portion 32 is fixed to the side surface 13 where the hollow hole 14 is formed. The nut 6 may be screwed into the piston rod 5 after inserting the piston 4 and the piston rod 5 into the cylinder 7, and is screwed to the side surface 13 where the hollow hole 14 of the cylinder body 3 is formed, It may be fixed to the side surface 13 of the cylinder body 3 with a screw or the like.

  When the piston rod 5 is rotated in this state, the piston 4 connected to one end of the piston rod 5 is brought into the cylinder 7 by screwing between the piston rod 5 and a nut 6 fixedly disposed on the cylinder body 3. Move forward and backward. At this time, since the piston 4 is connected to the piston 4 with a connecting structure that allows the piston rod 5 to rotate relative to the piston 4, the piston 4 is connected to the piston rod 5 in the cylinder 7. Slide without rotating together. Thereby, abrasion of piston 4 and cylinder 7 can be prevented.

  The space on the opening side of the cylinder 7 relative to the piston 4 is not shielded and communicates with the outside through the hollow hole 14 and the clearance between the nut 6 and the piston rod 5. For this reason, when the piston 4 moves back and forth in the cylinder 7, air quickly circulates between the space of the cylinder 7 on the side of the hollow hole 14 with respect to the piston 4 and the outside, so that the piston 4 smoothly flows into the cylinder 7. It can be moved forward and backward within.

  In addition, although the structure which attached the nut 6 to the cylinder main body 3 as mentioned above was illustrated as the internal thread part 32, it is not limited to this, For example, in the part which formed the hollow hole 14 of the cylinder main body 3, Instead of the hole 14, a female thread groove into which the piston rod 5 is screwed may be formed directly in the cylinder body 3.

  In the case where the female thread groove is directly formed in the cylinder body 3, it is necessary to secure a thickness sufficient to form the female thread in the flaw hole 14, and therefore, if an expensive aluminum alloy is used for the cylinder body 3, a manufacturing cost is required. . It is necessary to insert the piston 4 into the cylinder 7 while screwing the piston rod 5 into the female thread portion 32, and the loading operation becomes troublesome. On the other hand, as in the embodiment shown in FIG. 1, the manufacturing cost can be kept low by making the female thread portion 32 a nut 6 that is separate from the cylinder body 3, and the piston 4 and the piston rod 5 can be reduced. The operation | work inserted in the cylinder 7 can be made easy.

  When the work suction / holding device 1 sucks and holds the work W, first, the piston 4 is moved to the cylinder head 15 side before the work W is placed on the suction surface 2. As shown in FIG. 1, with the piston 4 positioned toward the cylinder head 15, the work W is placed on the suction surface 2 and the entire circumference of the sealing material 8 is brought into close contact with the surface to be sucked of the work W. . Then, as shown in FIG. 4, the piston rod 5 is rotated by a torque wrench 26 to move the piston 4 in a direction away from the cylinder head 15. As a result, the air in the area surrounded by the sealing material 8 on the suction surface 2 can be sucked from the suction port 9 through the communication path 16, and the area surrounded by the sealing material 8 on the suction surface 2 is set to a negative pressure. It can be sucked and held.

  The workpiece suction holding device 1 can generate a larger suction holding force as the piston rod 5 is rotated by the operation unit 24 and the piston 4 is moved away from the cylinder head 15. The rotating operation of the piston rod 5 can be sufficiently performed manually, and the workpiece W can be held with a strong suction holding force that can withstand machining. In addition, the work suction holding device 1 does not require a device such as a suction pump to suck and hold the work W, is economical, and sucks the work W even in a place where a suction pump or the like cannot be used. Can be retained. In addition, since the piston rod 5 is screwed with the nut 6 in the work suction / holding device 1, the rotation of the piston rod 5 is restricted unless the rotation of the piston rod 5 is operated. Can be fixed. For this reason, the suction holding state by the negative pressure of the workpiece | work W can be maintained as it is, and also in this case, apparatuses, such as a suction pump, are unnecessary and it is economical.

  When releasing the suction holding state of the workpiece W, the piston rod 5 is rotated to move the piston 4 toward the cylinder head 15 as shown in FIG. Return to the same state. Thereby, the suction state of the area surrounded by the sealing material 8 on the suction surface 2 can be released, and the workpiece W can be easily detached from the suction surface 2.

  The work suction holding device according to one embodiment of the present invention has been described above. However, the work suction holding device according to the present invention is not limited to the above-described embodiment, and does not depart from the gist of the present invention. Various changes can be made in.

  For example, the suction port 9 and the cylinder 7 may be communicated with each other at or near the cylinder head, and the communication path 16 that communicates the suction port 9 and the cylinder 7 is not limited to the above embodiment. Specifically, as shown in FIG. 5, a groove 51 communicating with the cylinder 7 and the second passage 16b is formed on the inner surface of the cylinder head 15 attached to the side surface 12 of the cylinder body 3, and the suction port 9 The cylinder 7 may be communicated with a groove 51 formed on the inner surface of the first passage 16a, the second passage 16b, and the cylinder head 15. Further, as shown in FIG. 6, a groove 52 is formed on the side surface 12 of the cylinder body 3, and the suction port 9 and the cylinder 7 are formed on the first passage 16 a, the second passage 16 b, and the side surface of the cylinder body 3. You may communicate with.

  An embodiment in which a groove 51 is provided on the inner side surface of the cylinder 7 as shown in FIG. 5 to allow the suction port 9 and the cylinder 7 to communicate with each other, and a side 52 in the side surface 12 of the cylinder body 3 is provided as shown in FIG. In the embodiment in which the cylinder 9 and the cylinder 7 are communicated, the projection 18 formed in the cylinder head 15 in the embodiment shown in FIG. 1 and the third passage 16c formed obliquely in the cylinder body 3 are also eliminated.

  Further, the sealing material disposed on the suction surface 2 may be disposed in various shapes according to the shape of the surface to be attracted of the workpiece. For example, as shown in FIG. 7, a plurality of sealing materials 61 may be arranged in an annular shape so as not to overlap each other, and suction ports 63 may be provided in the respective regions 62 surrounded by the sealing materials 61. In this case, as shown in FIG. 8, each suction port 63 may be communicated with the cylinder head of the cylinder 7 or the vicinity thereof so that the work W can be adsorbed in a region surrounded by each sealing material 61. In this embodiment, one work W (shown by a solid line in FIG. 8) is sucked and held in a portion surrounded by each seal material 61, or one work W (one-dot chain line in FIG. 8) is placed on each seal material 61. The surface W1 to be attracted) can be brought into close contact with each other, and the area surrounded by the respective seal members 61 can be cooperatively held by suction. For example, it is effective when sucking and holding the workpiece W in which the attracted surface W1 is dispersed and distributed, and the region surrounded by the sealing material 61 is set according to the shape of the attracted surface W1 of the workpiece W. Good.

  In the embodiment shown in FIG. 1, the suction surface 2 is formed on the upper surface of the cylinder body 3, but the suction surface 2 may be provided separately from the cylinder body 3. For example, as shown in FIG. 9, an O-ring 73 as a sealing material is annularly arranged on one side surface of an adsorbent 72 that is separate from the cylinder body 71, and a suction port is formed in a region surrounded by the O-ring 73. A hole to be 74 is formed to form the suction surface 75 of the workpiece W. The cylinder body 71 separate from the adsorbing body 72 is formed with an intake port 76 opened in the cylinder head 15 of the cylinder 7 or a space in the vicinity thereof, and the suction port 74 of the adsorbing body 72 and the cylinder body 71. The intake port 74 may be communicated with a communication pipe 77.

  Moreover, although the thing which formed the engagement structure 25 which engages the torque wrench 26 as the operation part 24 in the other end of the piston rod 5 was illustrated, the operation part 24 which operates rotation of the piston rod 5 is limited to this. Not. For example, a handle may be simply attached to the operation unit. Moreover, although illustration is abbreviate | omitted, the engagement structure which engages an electric drill driver with the other end of piston rod 5 may be formed, and you may make it operate rotation of piston rod 5 using an electric drill driver. . In this case, some electric drill drivers can adjust the torque. By using such an electric drill driver capable of adjusting the torque, the suction force can be automatically adjusted and the piston rod 5 can be rotated excessively. Without being too much, damage to each member of the workpiece suction holding device can be prevented. In addition, as an electric drill driver, it is good to use a rechargeable and cordless thing especially considering that cords do not interfere with work.

  In addition, some machine tools such as a plane cutting machine and a polishing apparatus are provided with a magnet chuck that holds a workpiece by magnetic force in order to hold an iron workpiece. In the case of using the workpiece suction and holding device of the present invention, there is a case where the workpiece suction and holding device is attached to a magnet chuck provided in a machine tool after the workpiece is sucked and held by the workpiece suction and holding device. In this case, the cylinder main body 3 made of an aluminum alloy in the work suction / holding device shown in FIG. 1 cannot be fixed with a magnet chuck as it is. Therefore, as shown in FIG. 10, a magnetic body may be attached to the bottom surface of the cylinder body 3. For example, as shown in FIG. 10, screw holes 82 are cut at four corners on the bottom surface of the cylinder body 3, and an iron plate 81 is attached as a magnetic body with bolts 83. As a result, for example, even in the processing of non-magnetic workpieces such as aluminum and copper, these workpieces are attracted to the workpiece adsorption holding device 1 fixed to the magnet chuck 84 provided in the machine tool, as shown in FIG. Since it is good to hold | maintain, the installation of the workpiece | work which does not have magnetism becomes easy.

It is sectional drawing of the workpiece | work adsorption | suction holding | maintenance apparatus of the mounting state of the workpiece | work which shows embodiment of this invention. It is a top view of the workpiece | work adsorption | suction holding | maintenance apparatus equivalent to FIG. It is an exploded sectional view of a work adsorption holding device. It is sectional drawing equivalent to FIG. 1 which shows the adsorption | suction holding | maintenance state of a workpiece | work. It is sectional drawing which shows the considerable modification of FIG. It is sectional drawing which shows the other modification equivalent to FIG. It is a top view of the workpiece | work adsorption | suction holding apparatus which shows the modification of the sealing material equivalent to FIG. It is sectional drawing which shows the state which mounted the workpiece | work of FIG. It is sectional drawing which shows the modification of a workpiece | work adsorption | suction holding device. It is a partially cutaway side view in which a magnetic body is attached to a workpiece adsorption holding device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Workpiece suction holding device 2 Suction surface 3 Cylinder body 4 Piston 5 Piston rod 6 Nut 7 Cylinder 7a Inner peripheral wall 8 Sealing material 9 Suction port 10 Mounting groove 10a, 10b, 10c Mounting groove 11 Groove 12, 13 Side surface 14 Buff hole 15 Cylinder Head 16 Communicating passage 16a First passage 16b Second passage 16c Third passage 16a Passage 17 Sealing material 18 Protrusion 22 Male screw groove 23 Connecting portion 24 Operating portion 25 Engaging structure 26 Torque wrench 27 Protruding portion 28 Insertion hole 29 Screw hole 30 Groove 31 Pin 32 Female thread W Each workpiece

Claims (2)

A sealing material that is annularly arranged on the suction surface that attracts the workpiece and adheres to the workpiece when the workpiece is attracted;
A suction port formed in a region surrounded by the sealing material of the suction surface;
The suction port, and a cylinder communicating with or near the cylinder head;
A piston hermetically charged in the cylinder;
A piston rod having one end connected to the piston and having an external thread groove formed on the outer periphery;
On the opening side of the cylinder, a female screw portion fixedly provided on the cylinder and screwed into the piston rod;
An apparatus for holding and holding a workpiece, comprising: an operation unit for operating rotation of the piston rod.   The piston and the piston rod are connected by a connecting structure that allows the piston rod to rotate relative to the piston, and when the piston rod is operated to rotate, the piston moves together with the piston rod in the cylinder. The workpiece suction holding device according to claim 1, wherein the workpiece suction holding device is slid without rotating.

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