JP2009178802A - Clamping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp device in which there is no need to confirm the size of a clearance between a valve hole and a valve element by respective clamp devices and a replacement part is inexpensive. <P>SOLUTION: The valve hole 32 is provided on a valve member 29 attached to a valve attachment hole 26 communicated with a midway of a feeding/discharge passage 22 provided on a cylinder body 2. When an adjustment valve part 44 of the valve element 31 movably attached to the valve element attachment hole 30 of the valve member 29 is inserted to the valve hole 32, a clearance S for adjusting a flow rate of a pressurization fluid is provided. Thereby, the size of the clearance S by the valve hole 32 and the adjustment valve part 44 can be confirmed even if the valve member 29 is not attached to the cylinder body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a clamping device.

Conventionally, a piston is fitted in a cylinder chamber provided in the cylinder body so as to be movable in the axial direction, and a piston rod connected to the piston is protruded from one end of the cylinder body, and is then supplied from the supply / discharge passage of the cylinder body to one cylinder chamber. Many clamping devices have been proposed in which a piston is moved by supplying pressurized fluid and discharging the pressurized fluid from the other cylinder chamber, and a clamper provided on the piston rod clamps and unclamps the workpiece. .
By the way, when clamping a large workpiece or the like using a jig having a plurality of the clamping devices, the distance from the pressurized fluid supply source to each clamping device is different, so that it is supplied to each clamping device for a certain time. The supply flow rate of the pressurized fluid differs, and the clamping timing of each clamping device varies. For this reason, there is a problem that the time until the workpiece is processed becomes long or the workpiece is displaced when an external force is applied to an unclamped location. The supply flow must be adjusted. Further, in order to reduce the size of the jig, it is necessary to reduce the size of the clamp device.

Therefore, as in the clamp device of Patent Document 1, there is known a device that includes a flow rate adjusting valve in an oil passage connected to an oil chamber of a hydraulic cylinder provided in the clamp body, and adjusts the hydraulic flow rate by the flow rate adjusting valve. ing. The flow regulating valve is mounted on a cylindrical valve case screwed into a mounting hole of the clamp body so that the valve member can be moved back and forth, and the valve body of the valve member is formed in the middle of the oil passage. It is configured to be slidably inserted back and forth into a valve hole connected to the front end of the hole. Therefore, when the valve member is moved back and forth, the size of the gap between the valve body portion of the valve member and the valve hole is changed, and the flow rate of the hydraulic pressure flowing therebetween is adjusted. Further, the valve member is provided with a bypass flow path that bypasses the gap between the valve body portion and the valve hole, and a check valve that closes the bypass flow path only in the direction of supplying hydraulic pressure to the oil chamber.
Japanese Patent Laid-Open No. 2004-360718

The flow rate adjusting valve provided in the clamping device described above inserts the valve body part of the valve member attached to the valve case into the valve hole formed in the middle part of the oil passage, and creates a gap between the valve body part and the valve hole. To form. The valve member is provided with a check valve. Therefore, when the valve member is mounted in the valve case screwed into the mounting hole of the clamp body, the valve body portion is inserted into the valve hole in the clamp body that cannot be seen, so that it may take time to assemble the valve member. was there. Moreover, since the size of the gap differs depending on the processing accuracy of the valve body portion and the valve hole, there is an inconvenience that the size of the gap must be confirmed by each clamping device. Further, in order to provide a check valve inside the valve member, after inserting the steel ball and the spring member into the steel ball housing hole of the valve member, the valve body portion of the valve member is caulked to thereby When replacing the member, it is necessary to replace the entire valve member, and the replacement part may be an expensive clamping device. Further, if the hydraulic pressure is discharged from the oil chamber or cleaning is performed with the valve member moved too far during maintenance, the valve member may fall off the valve case and be lost.
In view of the above problems, an object of the present invention is to provide a clamping device in which there is no need to check the size of the gap between the valve hole and the valve body with each clamping device, and the replacement parts are inexpensive. And

  According to the present invention, a piston is fitted in a cylinder chamber provided in a cylinder body so as to be movable in the axial direction, a piston rod connected to the piston is protruded from one end of the cylinder body, and one cylinder is inserted from a supply / discharge passage of the cylinder body. In a clamping device in which a piston is moved by supplying pressurized fluid to the chamber and discharging the pressurized fluid from the other cylinder chamber, and a clamper provided on the piston rod clamps and unclamps the workpiece. A valve mounting hole that communicates from the outside surface to the middle of the supply / discharge path is provided, and a flow rate adjustment valve that can adjust the flow rate of the pressurized fluid that flows through the supply / discharge path is installed in the valve mounting hole. A valve portion that is mounted in the valve mounting hole of the main body and has a valve hole that connects the outer supply / discharge passage to the supply / discharge passage on the cylinder chamber side and a valve body mounting hole provided from the outer surface toward the valve hole An adjustment valve portion that is movably mounted in the valve body mounting hole of the valve member toward the valve hole, and that can adjust the size of the gap between the valve hole and a supply / discharge path on the cylinder chamber side A valve body that has a check valve hole that communicates with the outer supply / discharge passage, and that incorporates a check valve body that prevents the flow to the cylinder chamber and allows the flow to the outside in the middle of the check valve hole The pressure fluid supplied to the supply / discharge passage is supplied to the cylinder chamber through the gap between the valve hole and the adjustment valve portion, and the pressure fluid discharged from the cylinder chamber is passed to the gap and the check valve hole. It is made to discharge from a supply / discharge path.

  Further, the present invention is characterized in that the adjustment valve portion of the valve body mounted in the valve body mounting hole is penetrated through the valve hole, and a retaining member that can be engaged with the valve member is provided at the tip of the adjustment valve portion. To do. Further, according to the present invention, the valve body is composed of a mounting member screwed into the valve body mounting hole of the valve member and a valve body member inserted into the valve body mounting hole of the valve member, and the valve body member has an axis line. A through-hole that penetrates in the direction is provided, the cylinder chamber side portion of the through-hole is formed as a small-diameter check valve hole, and the outer portion is formed as a large-diameter storage hole. It is characterized by interposing a stop spring.

  In the present invention, a valve mounting hole communicating from the outer surface of the cylinder body to the middle of the supply / discharge path is provided, and a flow rate adjusting valve capable of adjusting the flow rate of the pressurized fluid flowing through the supply / discharge path is mounted in the valve mounting hole, The flow rate adjusting valve is mounted in the valve mounting hole of the cylinder body, and has a valve hole for connecting the outer supply / discharge path to the supply / discharge path on the cylinder chamber side and a valve body mounting hole provided from the outer surface toward the valve hole. A valve member, a valve body mounting hole of the valve member that is movably mounted toward the valve hole, and that can adjust the size of the gap between the valve hole and a cylinder chamber side supply / discharge It has a check valve hole that allows the passage to communicate with the outer supply / discharge passage, and a check valve body that prevents the flow to the cylinder chamber side and allows the flow to the outside in the middle of the check valve hole. A valve body is provided, and the pressurized fluid supplied to the supply / exhaust passage is passed through the gap between the valve hole and the adjustment valve portion to be supplied to the cylinder chamber. The pressure fluid discharged from the valve passes through the gap and the check valve hole and is discharged from the supply / discharge passage, so that the adjustment valve portion of the valve body is provided in the valve hole provided in the valve member attached to the cylinder body. When inserted, a gap for adjusting the flow rate of the pressurized fluid is provided, so that it is possible to check the size of the gap between the valve hole and the adjustment valve portion without attaching a valve member to the cylinder body. Thus, the size of the gap is unified.

  In addition, the adjustment valve part of the valve body attached to the valve body attachment hole is penetrated through the valve hole, and a retaining member that can be engaged with the valve member is provided at the tip of the adjustment valve part. Even if the pressurized fluid (pressure oil) is discharged or cleaned, the valve body does not fall off the valve member and is not lost. Furthermore, by inserting a steel ball and a check spring into the through hole provided in the valve body and closing one of the through holes with a mounting member, the check spring and the steel ball can be easily replaced. This can be done, and the replacement parts are also inexpensive.

  In the cylinder body 2 of the clamping device 1 shown in FIG. 1, one end of a cylinder tube 3 having a cylinder hole 3a is closed by a rod cover 4, and a cylinder chamber 5 is formed inside. An annular piston 6 is fitted in the cylinder chamber 5 so as to be movable in the axial direction, and the cylinder chamber 5 is partitioned into a head side cylinder chamber 7 and a rod side cylinder chamber 8. The lower end portion of the piston rod 10 is screwed to the female thread portion 9 formed on the piston 6. An upper end portion of the piston rod 10 projects forward from the rod cover 4 in the axial direction, and a clamper 11 is fixed to a tapered surface 10 a of the upper end portion by a nut 12. A plurality (four) of turning guide grooves 13 are provided on the outer peripheral surface of the piston rod 10 as shown in FIG. The turning guide groove 13 includes a cam groove 14 formed in the axial direction and an oblique cam groove 15 formed in the circumferential direction, and the guide surface 14a of the cam groove 14 and the guide surface 15a of the cam groove 15 are continuous. It is like that. 4 and 5, the wall T is formed between the other side surfaces 14b and 15b of the adjacent cam grooves 14 and 15, but the side surfaces 14b and 15b may not be provided, so the wall T is formed. It may be removed by processing. A pin member 16 to be engaged with each turning guide groove 13 is provided on the rod cover 4 of the cylinder body 2.

  The rod cover 4 has a substantially rectangular shape whose outer shape extends further outward in the tube radial direction than the outer shape of the cylinder tube 3, and a fitting shaft portion 17 that is fitted into the cylinder hole 3a protrudes from the lower surface 4a. In the insertion shaft portion 17, pin members 16 are rotatably fitted in a plurality of mounting holes 18 provided so that the hole axis HL does not intersect the axis CL (longitudinal direction) of the piston rod 10. In FIG. 4, two sets of mounting holes 18, which are a pair, are provided in the insertion shaft portion 17 of the rod cover 4 symmetrically with respect to the cylinder center line (the axis CL of the piston rod 10). One of the hole axis lines HL is provided so as to pass through the right side of the axis line CL of the piston rod 10 toward the piston rod 10 side and the other through the left side.

Next, the end 19 on the piston rod 10 side of the pin member 16 fitted in the mounting hole 18 is located near the inner opening of the mounting hole 18 on the side 19b opposite to the axis CL side 19a of the piston rod 10. An axis CL side 19a of the rod 10 is provided so as to protrude from the inner opening of the mounting hole 18 to the piston rod 10 side, and the outer peripheral surface 20 of the pin member 16 opposite to the axis CL side of the piston rod 10 covers substantially the entire length. Thus, it is supported on the inner surface of the mounting hole 18. At least two of the plurality of mounting holes 18 are provided such that one of the hole axis lines HL passes the right side of the axis line CL of the piston rod 10 toward the piston rod 10 side and the other passes the left side. The engagement amount L between the pin member 16 fitted in the mounting hole 18 and the turning guide groove 13 is set to be larger on the opposite side of the pin member 16 in the rotation direction around the axis line CL of the piston rod 10. It is.
The rod cover 4 is provided with a pair of supply / discharge paths 21 and 22. One supply / discharge passage 21 communicates with one end of a communication passage 24 provided in the longitudinal direction of the cylinder tube 3 via a fluid passage 23 of the rod cover 4. The other end of the communication passage 24 communicates with the head side cylinder chamber 7. The other supply / discharge passage 22 communicates with the rod side cylinder chamber 8 via another fluid passage 25 of the rod cover 4. A valve mounting hole 26 communicating with each of the supply and discharge passages 21 and 22 is provided from the outer surface of the cylinder body 2, and a flow rate adjusting valve 27 capable of adjusting the flow rate of the pressurized fluid flowing through the fluid passage 25 in the valve mounting hole 26; Plugs 28 are respectively attached.

The flow rate adjusting valve 27 will be described. The flow rate adjusting valve 27 is configured by mounting a valve body 31 in a valve body mounting hole 30 of a valve member 29. The valve member 29 includes a hexagonal large-diameter portion 29a and a small-diameter portion 29b provided with a screw portion on the outer periphery, and a valve hole 32 and a valve body mounting hole 30 are provided on the inner side. The valve member 29 is screwed into the valve mounting hole 26 of the cylinder body 2 until the end surface of the large-diameter portion 29a contacts the outer surface of the cylinder body 2. Seal members 33 are attached to the large diameter portion 29a and the small diameter portion 29b, respectively. A plurality of (four) first communication holes 34 are provided in the small diameter portion 29 b of the valve member 29 so as to communicate with the valve body mounting hole 30.
The valve body 31 includes a mounting member 35 that is screwed to the outside of the valve body mounting hole 30 and a valve body member 36 that is fitted into the valve body mounting hole 30 on the cylinder chamber 5 side. A seal member 37 is attached to the valve body member 36. The valve body member 36 is provided with a through hole 38 penetrating in the axial direction. A portion of the through hole 38 on the cylinder chamber 5 side is formed in a small check valve hole 39, and an outer portion is formed in a large diameter storage hole 40. A check valve body 41 (for example, a steel ball) is inserted into the storage hole 40. A check spring 42 is interposed between the mounting member 35 and the steel ball 41, and the check valve hole 39 is closed by the steel ball 41 urged by the spring 42. The valve body member 36 of the valve body 31 is provided with a plurality (four) of second communication holes 43 so as to communicate with the storage hole 40. The valve body member 36 of the valve body 31 is provided with an adjustment valve portion 44 that is inserted into the valve hole 32 of the valve member 29. A retaining member 45 (for example, a C-shaped retaining ring) is attached to the tip of the adjustment valve portion 44. The mounting member 35 of the valve body 31 is provided with a hexagon hole 46 for engaging a tool such as a hexagon wrench. Further, the valve body 31 is prevented from coming out of the valve member 29 by a nut 47 screwed into the mounting member 35 of the valve body 31.

  When the pressurized fluid (pressure oil) is supplied from the outer supply / discharge passage 22a in the flow rate adjustment valve 27 having the above-described configuration, as shown in FIG. 6, the valve mounting hole 26, the first communication hole 34 of the valve member 29, It flows into the storage hole 40 of the valve body 31 through the valve body mounting hole 30 and the second communication hole 43 of the valve body 31, and also into the clearance S between the valve body mounting hole 30 and the valve hole 32 and the adjustment valve portion 44. It comes to flow. Since the check valve hole 39 is closed by the steel ball 41, the pressurized fluid (pressure oil) passes only through the gap S between the valve hole 32 and the adjustment valve portion 44. On the other hand, when the pressurized fluid (pressure oil) is discharged from the supply / discharge passage 22b on the cylinder chamber 5 side, as shown in FIG. 8, it flows into the check valve hole 39 of the valve body 31, and the valve hole 32 and the regulating valve. It flows into the gap S between the holes 44. The steel ball 41 is pressed toward the mounting member 35 by the pressurized fluid (pressure oil) flowing through the check valve hole 39, and the check valve hole 39 is opened to pass through the storage hole 40 from the check valve hole 39. Along with the pressurized fluid (pressure oil) that flows from the second communication hole 43 of the valve body 31 to the valve body mounting hole 30 and passes through the gap S between the valve hole 32 and the adjustment valve portion 44, the first of the valve member 29. It flows through the communication hole 34 and the valve mounting hole 26 to the outer supply / discharge path 22a. Therefore, by moving the valve body 31 in the front-rear direction and adjusting the size of the gap S between the valve hole 32 and the adjustment valve portion 44, the supply / discharge path on the cylinder chamber 5 side from the outer supply / discharge path 22a. The flow rate of the pressurized fluid (pressure oil) supplied to 22b is adjusted.

  Next, operation | movement of the clamp apparatus 1 of the said structure is demonstrated. When the clamper 11 is in the unclamping position B as shown in FIG. 2, pressurized fluid (pressure oil) is supplied from the other supply / discharge passage 22 to the rod side cylinder chamber 8 through the flow rate adjustment valve 27 and the fluid passage 25. As a result, the piston 6 moves downward along the axis, and the piston rod 10 turns 90 degrees while moving downward along the axis along the turning guide groove 13 engaged with the pin member 16, and then maintains the turning position. The clamper 11 is lowered toward the workpiece W and the clamper 11 clamps the workpiece W at the clamp position A. Further, when the clamper 11 is in the clamp position A as shown in FIG. 1, pressurized fluid (pressure oil) is supplied from one supply / discharge passage 21 to the head side cylinder chamber 7 via the fluid passage 23 and the communication passage 24. Then, the piston 6 moves upward along the axis, and the piston rod 10 operates in the reverse direction to that described above, so that the clamper 11 is in the unclamping position B.

  Accordingly, when a large workpiece W1 is clamped using a jig 60 having a plurality of clamping devices 1 as shown in FIG. 9, the rod side cylinder chamber 8 is controlled by the flow rate adjusting valve 27 provided in each of the clamping devices 1A to 1F. By adjusting the supply flow rate of the pressurized fluid (pressure oil) supplied to the clamp, even if the distance from the supply source 61 of the pressurized fluid (pressure oil) to each of the clamp devices 1A to 1F differs, the clamps by the clamp devices 1A to 1F It is easy to make the timings at the same time. Further, when the adjusting valve portion 44 of the valve body 31 is inserted into the valve hole 32 provided in the valve member 29 attached to the cylinder body 2, a clearance S for adjusting the flow rate of the pressurized fluid (pressure oil) is provided, so that the cylinder Since the size of the gap S between the valve hole 32 and the adjusting valve portion 44 can be confirmed without mounting the valve member 29 on the main body 2, the size of the gap S should be unified in each clamping device 1. Can do. Further, by providing a retaining member 45 at the tip of the adjustment valve portion 44 of the valve body 31 that penetrates the valve hole 32, the pressurized fluid (pressure oil) is discharged from the cylinder chamber 8 during maintenance as shown in FIG. Even if the cleaning or the like is performed, it is possible to prevent the valve body 31 from being lost from the valve member 29 without dropping. Further, a steel ball 41 and a check spring 42 are inserted into the accommodation hole 40 of the through hole 38 provided in the valve body 31 so that one of the through holes 38 is closed by the mounting member 35, so that the check spring 42. Since the steel ball 41 can be easily replaced, the replacement parts can be made cheaper than in the past.

It is a longitudinal cross-sectional view of the clamp apparatus which is the clamp state of this invention. It is a longitudinal cross-sectional view of the clamp apparatus which is an unclamp state. It is a top view of FIG. It is the IV-IV sectional view taken on the line of FIG. It is an outer peripheral surface development view of a piston rod. It is the VI-VI sectional view taken on the line of FIG. It is the figure which abbreviate | omitted the cylinder main body in the VII-VII sectional view taken on the line of FIG. It is a figure which shows the state which discharged the pressurized fluid. It is a figure which shows the jig | tool comprised so that a big workpiece | work may be clamped. It is a figure which shows the state which moved the valve body back.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp apparatus 2 Cylinder main body 5 Cylinder chamber 6 Piston 10 Piston rod 11 Clamper 21 Supply / discharge path 22 Supply / discharge path 22a Outer supply / discharge path 22b Cylinder chamber side supply / discharge path 26 Valve mounting hole 27 Flow rate adjusting valve 29 Valve member 30 Valve body mounting hole 31 Valve body 32 Valve hole 35 Mounting member 36 Valve body member 38 Through hole 39 Check valve hole 40 Storage hole 41 Steel ball 42 Check spring 44 Adjusting valve part 45 Retaining member S Clearance W Workpiece

Claims (3)

A piston is fitted in a cylinder chamber provided in the cylinder body so as to be movable in the axial direction, a piston rod connected to the piston is protruded from one end of the cylinder body, and pressure fluid is supplied from the supply / discharge passage of the cylinder body to one cylinder chamber. In the clamping device in which the piston is moved by discharging the pressurized fluid from the other cylinder chamber and the clamper provided on the piston rod clamps and unclamps the workpiece, from the outer surface of the cylinder body A valve mounting hole communicating in the middle of the supply / discharge path is provided, and a flow rate adjustment valve capable of adjusting the flow rate of the pressurized fluid flowing through the supply / discharge path is installed in the valve installation hole. A valve member that is mounted in the hole and has a valve hole that connects the outer supply / discharge passage to the supply / discharge passage on the cylinder chamber side and a valve body attachment hole that is provided from the outer surface toward the valve hole; Both are mounted in the valve body mounting hole of the valve member so as to be movable toward the valve hole, and the adjustment valve portion capable of adjusting the size of the gap between the valve hole and the supply / discharge passage on the cylinder chamber side on the outside It has a check valve hole that communicates with the supply / exhaust passage, and has a valve element that incorporates a check valve element that prevents the flow to the cylinder chamber and allows the flow to the outside in the middle of the check valve hole. Then, the pressurized fluid supplied to the supply / discharge passage is passed through the gap between the valve hole and the regulating valve portion to be supplied to the cylinder chamber, and the pressurized fluid discharged from the cylinder chamber is passed through the gap and the check valve hole. A clamping device characterized by discharging from a supply / discharge path. 2. The valve body of the valve body mounted in the valve body mounting hole is provided with a retaining member that penetrates the valve hole and is engageable with the valve member at the tip of the valve body. Clamping device. The valve body is composed of a mounting member screwed into the valve body mounting hole of the valve member and a valve body member fitted into the valve body mounting hole of the valve member, and a through hole penetrating the valve body member in the axial direction The cylinder chamber side portion of the through hole is formed as a small check valve hole, and the outer portion is formed as a large diameter storage hole, and a check spring is interposed between the mounting member and the check valve body. The clamping device according to claim 1, wherein the clamping device is formed.

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