WO2018186136A1 - 旋回式クランプ - Google Patents
旋回式クランプ Download PDFInfo
- Publication number
- WO2018186136A1 WO2018186136A1 PCT/JP2018/009953 JP2018009953W WO2018186136A1 WO 2018186136 A1 WO2018186136 A1 WO 2018186136A1 JP 2018009953 W JP2018009953 W JP 2018009953W WO 2018186136 A1 WO2018186136 A1 WO 2018186136A1
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- WO
- WIPO (PCT)
- Prior art keywords
- piston
- valve
- output rod
- groove
- hole
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000033001 locomotion Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 37
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000004308 accommodation Effects 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 230000029058 respiratory gaseous exchange Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/061—Arrangements for positively actuating jaws with fluid drive
- B25B5/062—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis parallel to the pressing direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/10—Auxiliary devices, e.g. bolsters, extension members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/0063—Connecting non-slidable parts of machine tools to each other
- B23Q1/0081—Connecting non-slidable parts of machine tools to each other using an expanding clamping member insertable in a receiving hole
- B23Q1/009—Connecting non-slidable parts of machine tools to each other using an expanding clamping member insertable in a receiving hole the receiving hole being cylindrical or conical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
Definitions
- This invention relates to a clamp device of a type for turning an output rod.
- Patent Document 1 Japanese Patent Document 1 (Japan, JP-A-10-109239).
- the prior art is configured as follows.
- a piston is inserted into the housing so as to be movable in the vertical direction.
- the lower part of the output rod is inserted into the accommodation hole opened on the upper surface of the piston so as to be movable in the vertical direction.
- a lock spring is mounted on the upper side of the piston, and the lower end of the lock spring is brought into contact with the upper surface of the piston. Further, the lower end portion of the lock spring faces the upper surface of the step portion formed on the outer peripheral wall of the output rod with a predetermined interval.
- a working chamber into which pressure oil is supplied and discharged is provided below the piston.
- a compression spring is mounted between the lower end of the output rod and the bottom wall of the accommodation hole.
- An operation groove is formed in a spiral shape on the inner peripheral wall of the accommodation hole, and a turning groove is formed on the outer peripheral wall below the output rod so as to face the operation groove.
- a transmission ball is inserted between the operation groove and the turning groove.
- the above prior art has the following problems. If the step portion of the output rod is gently brought into contact with the lower end of the lock spring from below during the lock driving process of the conventional swivel clamp, the output rod is positioned at a predetermined circumferential position with respect to the piston. Stopped at. On the other hand, when the step portion of the output rod is vigorously brought into contact with the lower end portion of the lock spring, the turning groove of the output rod is formed in the receiving hole via the transmission ball by the inertial force in the circumferential direction of the output rod. Then, the output rod is stopped at a position where the output rod goes too far in the circumferential direction from the predetermined position with respect to the piston.
- An object of the present invention is to provide a swivel clamp that can reliably stop the output rod of the swivel clamp at a predetermined position in the circumferential direction.
- a pivoting clamp is configured as follows.
- a piston 4 is inserted into the housing 1 so as to be movable in the axial direction.
- a receiving hole 5 is formed in the piston 4 in the axial direction.
- An output rod 6 is inserted into the receiving hole 5 so as to be movable in the axial direction.
- a biasing means 9 mounted between the piston 4 and the output rod 6 biases the piston 4 and the output rod 6 so as to separate them.
- a working chamber 15 is formed on the base end side of the piston 4, and pressure fluid is supplied to and discharged from the working chamber 15.
- a lock spring 16 is provided on the distal end side of the piston 4 in the housing 1 so as to bias the piston 4 toward the proximal end side in the axial direction.
- the movement of the piston 4 in the axial direction is converted into a turning motion of the output rod 6 by the conversion mechanism 22.
- a guide groove 28 is formed in the circumferential direction on one of the inner peripheral wall of the receiving hole 5 and the outer peripheral wall of the output rod 6, and a locking portion 29 is formed at the circumferential end of the guide groove 28.
- the An engaging member 31 provided on the other of the inner peripheral wall of the receiving hole 5 and the outer peripheral wall of the output rod 6 is inserted into the guide groove 28.
- the engaging member 31 is faced with a predetermined interval in the circumferential direction so as to be able to contact the locking portion 29.
- the output rod is reliably stopped at a predetermined position in the circumferential direction with respect to the piston by configuring the engagement member to be able to be received in the circumferential direction by the engaging portion of the guide groove.
- the conversion mechanism 22 includes an operation groove 23, a turning groove 24, a circulation groove 25, and a transmission member 26.
- An operation groove 23 is formed in a spiral shape on the inner peripheral wall of the receiving hole 5.
- a turning groove 24 is formed on the outer peripheral wall of the output rod 6.
- a circulation groove 25 formed on the outer peripheral wall of the output rod 6 communicates the base end portion 24a of the turning groove 24 and the distal end portion 24b of the turning groove 24 in the axial direction.
- a transmission member 26 is inserted between the operation groove 23 and the turning groove 24 and between the inner peripheral surface of the accommodation hole 5 and the circulation groove 25. In this case, the force pushing the piston in the axial direction can be reliably transmitted to the output rod through the operation groove, the transmission member, and the turning groove.
- a flow path for supplying a pressure fluid for detection is formed in the housing 1.
- Detection valves 40 and 50 for opening and closing the flow path by the piston 4 are provided in the flow path.
- the flow path includes supply paths 36 and 37, valve holes 42 and 52, and a discharge path.
- Supply paths 36 and 37 are formed in the housing 1.
- Valve holes 42 and 52 formed in the detection valves 40 and 50 communicate with the supply passages 36 and 37.
- a discharge passage formed between the housing 1 and the piston 4 is communicated with the valve holes 42 and 52. In this case, the detection valve reliably detects that the piston has been moved to the predetermined position.
- the detection valves 40 and 50 have valve seats 44 and 54 and valve members 45 and 55.
- Valve seats 44 and 54 are formed on the inner peripheral walls of the valve holes 42 and 52.
- Valve members 45 and 55 are inserted into the valve holes 42 and 52 so as to be able to advance and retract, so as to be able to contact the valve seats 44 and 54.
- the valve members 45 and 55 are urged toward the piston 4 by urging means 46 and 56 provided in the valve holes 42 and 52. In this case, when the piston is moved to a predetermined position, the piston operates the valve member to separate the valve member from the valve seat. Thereby, it detects reliably.
- FIG. 1 is a cross-sectional view showing a swivel clamp in an unclamped state according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a clamped state of the above-described swivel clamp and is similar to FIG. 3A is a cross-sectional view taken along line 3A-3A in FIG.
- FIG. 3B is a developed view showing a state in which the piston of the swivel clamp is cut along the line 3B in FIG. 3A and the cut surface is viewed from the outside.
- FIG. 3C is a developed view showing a state in which the output rod of the swing clamp is cut along the line 3C in FIG. 3A of the swing clamp and the cut surface is viewed from the outside.
- FIG. 4A to 4C show a second embodiment of the present invention.
- FIG. 4A is a cross-sectional view showing the swing type clamp device in an unclamped state, and is similar to FIG. 3A.
- 4B is a cross-sectional view taken along line 4B-4B in FIG. 4A.
- 4C is a cross-sectional view taken along line 4C-4C in FIG. 4A.
- FIGS. 1 to 3C A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3C. In this embodiment, a case where the cylinder device is applied to a swing clamp for fixing a workpiece is illustrated. First, the overall structure of the above-mentioned swivel clamp will be described with reference to FIG.
- the housing 1 is attached to the table T as a fixed base by a plurality of bolts (not shown).
- the housing 1 has a lower wall 1a, a body portion 1b, and an upper wall 1c that are formed in this order from below.
- a cylinder hole 2 is formed in the body portion 1b of the housing 1, and the cylinder hole 2 has a large-diameter hole 2a and a small-diameter hole 2b formed in order from the lower side.
- the piston 4 is movable in the vertical direction and is inserted into the large-diameter hole 2a in a tightly sealed manner.
- An accommodation hole 5 is opened upward in the piston 4.
- the lower portion of the output rod 6 is inserted into the receiving hole 5 so as to be movable in the vertical direction, and the upper portion of the output rod 6 is movable in the vertical direction on the upper wall 1c of the housing 1 and is pivotable about the axis. Inserted into.
- a clamp arm 7 is attached to the top of the output rod 6.
- a mounting hole 8 is formed below the output rod 6, and a compression spring (biasing means) 9 is mounted in the mounting hole 8.
- the upper end portion of the compression spring 9 is brought into contact with the ceiling wall of the mounting hole 8, and the lower end portion of the compression spring 9 is brought into contact with the bottom wall of the receiving hole 5 through the spring receiver 10 and the engagement ball 11. The Thereby, the urging force of the compression spring 9 acts in the direction in which the piston 4 and the output rod 6 are separated.
- Drive means 13 for moving the piston 4 in the vertical direction (axial direction) is provided in the housing 1.
- the drive means 13 is configured as follows.
- a spring chamber 14 is formed above the piston 4, and a working chamber 15 is formed below the piston 4.
- a lock spring 16 is mounted in the spring chamber 14, and the lock spring 16 urges the piston 4 downward against the upper wall 1 c of the housing 1.
- the spring chamber 14 communicates with a breathing hole 14a communicating with outside air.
- a supply / discharge passage 17 for supplying and discharging pressure oil (pressure fluid) to and from the working chamber 15 is formed in the body portion 1 b of the housing 1.
- a guide groove 18 is formed on the outer peripheral wall of the piston 4 in the vertical direction.
- a pin 19 that protrudes inward in the radial direction from the body portion 1 b of the housing 1 is inserted into the guide groove 18.
- the piston 19 is guided in the vertical direction by the pin 19 and the guide groove 18 and is prevented from rotating with respect to the housing 1.
- a conversion mechanism 22 that converts the upward and downward movement of the piston 4 into a turning motion of the output rod 6 is provided between the inner peripheral wall of the accommodation hole 5 of the piston 4 and the outer peripheral wall of the output rod 6.
- the conversion mechanism 22 is configured as follows, as shown in FIGS. 3A to 3C.
- the operation groove 23 is formed in a spiral shape on the inner peripheral wall of the accommodation hole 5 of the piston 4.
- the turning groove 24 is formed on the outer peripheral wall of the output rod 6 by about one pitch so as to face the operation groove 23.
- a circulation groove 25 is formed in the outer peripheral wall of the output rod 6 to allow the lower end portion (base end portion) 24 a and the upper end portion (tip end portion) 24 b of the turning groove 24 to communicate with each other substantially in the vertical direction. For this reason, the dimension of the circumferential direction of the circulation groove
- a plurality of transmission balls (transmission members) 26 are inserted between the operation groove 23 and the turning groove 24 and between the inner peripheral surface of the accommodation hole 5 and the circulation groove 25 so as to be able to roll.
- a guide groove 28 is formed in the circumferential direction on the inner peripheral wall of the accommodation hole 5 of the piston 4.
- a locking portion 29 is formed at the circumferential end of the guide groove 28.
- a concave portion 30 is formed in the vertical direction on the outer peripheral wall of the output rod 6, and an engagement pin (engagement member) 31 is attached to the concave portion 30.
- the engaging pin 31 is inserted into the guide groove 28, and the engaging pin 31 faces the engaging portion 29 of the guide groove 28 so as to be able to contact with a predetermined interval in the circumferential direction.
- a screw hole 31 a is formed in the engaging pin 31 in the vertical direction, and a screw for removing the engaging pin 31 from the recess 30 can be screwed into the screw hole 31 a.
- the cylinder device operates as follows.
- pressure oil is supplied to the working chamber 15.
- the pressure oil in the working chamber 15 presses the piston 4 upward against the urging force of the lock spring 16, so that the bottom wall of the accommodation hole 5 of the piston 4 pushes the lower end of the output rod 6 upward. ing.
- the stepped portion 6a formed in the middle of the output rod 6 in the height direction is received by the thrust bearing 34 mounted on the upper wall 1c of the housing 1 at the upper limit position.
- the engaging pin 31 of the output rod 6 is configured to be received by the engaging portion 29 of the guide groove 28 of the piston 4 from the circumferential direction. Accordingly, the piston 4 can reliably stop the output rod 6 at a predetermined position in the circumferential direction via the conversion mechanism 22. As a result, the clamp arm can press the workpiece at a predetermined position on the workpiece.
- (Second Embodiment) 4A to 4C show a second embodiment of the present invention.
- the same members (or similar members) as the constituent members of the first embodiment will be described with the same reference numerals in principle.
- the body 1b of the housing 1 is formed with a first supply path 36 for supplying lock detection air and a second supply path 37 for supplying release detection air.
- the A first mounting hole 38 communicating with the first supply path 36 is formed in the body portion 1 b of the housing 1.
- a second mounting hole 39 that communicates with the second supply path 37 is formed in the body 1 b of the housing 1.
- the first mounting hole 38 and the second mounting hole 39 are communicated with the large-diameter hole 2a of the cylinder hole 2, respectively.
- a first detection valve (detection valve) 40 that detects that the piston 4 has been moved to the locked position is mounted in the first mounting hole 38.
- the second mounting hole 39 is mounted with a second detection valve (detection valve) 50 that detects that the piston 4 has been moved to the release position.
- the first detection valve 40 is configured as follows.
- the valve case 41 of the first detection valve 40 is screwed into the first mounting hole 38 in a tightly sealed manner.
- a first valve hole (valve hole) 42 is formed in the left portion of the valve case 41.
- a first communication hole 43 is formed in the cylindrical wall of the valve case 41, and the first supply passage 36 and the first valve hole 42 are communicated with each other through the first communication hole 43.
- a tapered first valve seat (valve seat) 44 is formed on the inner peripheral wall of the first valve hole 42.
- a first engaging ball (valve member) 45 and a first advancing spring (biasing means) 46 are mounted in the first valve hole 42, and the first engaging ball 45 is moved by the first advancing spring 46 to the first valve. It is biased toward the seat 44.
- the second detection valve 50 is configured as follows, as shown in FIGS. 4A and 4C.
- the valve case 51 of the second detection valve 50 is screwed into the second mounting hole 39 in a tightly sealed manner.
- a second valve hole (valve hole) 52 is formed in the left portion of the valve case 51.
- a second communication hole 53 is formed in the cylindrical wall of the valve case 51, and the second supply passage 37 and the second valve hole 52 communicate with each other through the second communication hole 53.
- a tapered second valve seat (valve seat) 54 is formed on the inner peripheral wall of the second valve hole 52.
- a second engagement ball (valve member) 55 and a second advancing spring (biasing means) 56 are mounted in the second valve hole 52, and the second advancing spring 56 causes the second engagement ball 55 to move to the second valve. It is urged toward the seat 54.
- a first engagement groove 47 and a second engagement groove 57 are formed in the vertical direction on the outer peripheral wall of the piston 4.
- a first retraction groove 48 is formed on the outer peripheral wall of the piston 4 so as to be continuous with the upper side of the first engagement groove 47.
- the first engagement ball 45 of the first detection valve 40 is inserted into the first engagement groove 47 and the first retraction groove 48.
- a second retraction groove 58 is formed on the outer peripheral wall of the piston 4 so as to be continuous with the lower side of the second engagement groove 57.
- the second engagement ball 55 of the second detection valve 50 is inserted into the second engagement groove 57 and the second retraction groove 58.
- the first detection valve 40 and the second detection valve 50 of the swivel clamp operate as follows. 4A to 4C, the piston 4 is moved to the upper limit position by the pressure oil supplied to the working chamber 15. At this time, as shown in FIGS. 4A and 4B, the first engagement groove 47 of the piston 4 moves the first engagement ball 45 to the right. Therefore, the first engagement ball 45 is separated from the first valve seat 44. Accordingly, the first detection valve 40 is opened. As a result, the compressed air in the first supply path 36 passes through the first communication hole 43, the first valve hole 42, the valve opening gap, the first engagement groove 47, the first retraction groove 48, and the breathing hole 14a. It is discharged outside. Further, as shown in FIGS.
- the second engagement ball 55 is inserted into the second retraction groove 58 of the piston 4. For this reason, the second engagement ball 55 is in contact with the second valve seat 54 by the second advance spring 56. Therefore, the second detection valve 50 is closed. As a result, the pressure of the compressed air in the second supply passage 37 increases, and the pressure increase is detected by a pressure sensor (not shown). As a result, it is detected that the piston 4 is moved to the release position (upper limit position).
- the compressed air in the second supply passage 37 passes through the second communication hole 53, the second valve hole 52, the valve opening gap, the second engagement groove 57, the second retraction groove 58, and the breathing hole 14a. It is discharged outside. Subsequently, the left end portion of the clamp arm 7 is brought into contact with the workpiece (not shown) from above. As a result, the swivel clamp is switched from the unclamped state of FIG. 1 to the clamped state of FIG. At this time, the first engagement ball 45 of the first detection valve 40 is inserted into the first retraction groove 48. Therefore, the first advancing spring 46 moves the first engagement ball 45 to the left, and the first engagement ball 45 comes into contact with the first valve seat 44. As a result, the pressure of the compressed air in the first supply path 36 is increased, and the increased pressure is detected by a pressure sensor (not shown). As a result, it is detected that the piston 4 is moved to the lock position (downward position).
- the first flow path (flow path) for supplying lock detection air is the first supply path 36, the first communication hole 43, the first valve hole 42, the valve opening gap, and the cylinder hole 2 ( The first engagement groove 47 and the first retraction groove 48) and the breathing hole 14a are configured.
- the second flow path (flow path) for supplying release detection air includes the second supply path 37, the second communication hole 53, the second valve hole 52, the valve opening gap, and the cylinder hole 2 (second engagement groove). 57 and the second retraction groove 58) and the breathing hole 14a.
- the first discharge path (discharge path) for discharging lock detection air includes a space formed between the cylinder hole 2, the first engagement groove 47, and the first retraction groove 48, and a breathing hole. 14a.
- the second discharge path (discharge path) for discharging release detection air is formed by a space formed between the cylinder hole 2, the second engagement groove 57, and the second retraction groove 58, and the breathing hole 14a. Composed.
- the above embodiment can be modified as follows.
- the pressure fluid may be other liquid or gas such as compressed air, instead of the exemplified pressure oil.
- the recess 30 for mounting the engagement pin 31 may be formed on the inner peripheral wall of the accommodation hole 5 of the piston 4 instead of being formed on the outer peripheral wall of the output rod 6.
- the guide groove 28 may be formed on the outer peripheral wall of the output rod 6 instead of being formed on the inner peripheral wall of the accommodation hole 5 of the piston 4.
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Abstract
Description
ハウジング内にピストンが上下方向へ移動可能に挿入される。そのピストンの上面に開口される収容孔に、出力ロッドの下部が上下方向へ移動可能に挿入される。ピストンの上側にロックバネが装着され、そのロックバネの下端部がピストンの上面に当接される。また、そのロックバネの下端部が、出力ロッドの外周壁に形成された段差部の上面に当接可能となるように所定の間隔をあけて対面される。ピストンの下側に、圧油が供給および排出される作動室が設けられる。上記の出力ロッドの下端部と収容孔の底壁との間に圧縮バネが装着される。収容孔の内周壁に操作溝が螺旋状に形成されると共に、その操作溝に対面するように旋回溝が出力ロッドの下部の外周壁に形成される。その操作溝と旋回溝との間に伝動ボールが挿入される。
そして、上記の旋回式クランプをロック駆動させるときには、作動室の圧油を排出すると、ロックバネがピストンを下方へ真っ直ぐに移動させていく。すると、圧縮バネがピストンと出力ロッドとを離間させることにより、ピストンが操作溝と伝動ボールと旋回溝を介して出力ロッドを回転させる。次いで、出力ロッドの段差部の上面がロックバネの下端部に当接されることにより、出力ロッドの回転が停止される。引き続いて、ピストンと出力ロッドとが一体的に下方へ真っ直ぐに移動される。
上記の従来の旋回式クランプのロック駆動行程の途中で、出力ロッドの段差部がロックバネの下端部に下方から緩やかに当接される場合には、出力ロッドがピストンに対して周方向の所定位置で停止される。これに対して、出力ロッドの段差部がロックバネの下端部に勢いよく当接される場合には、出力ロッドの周方向への慣性力によって当該出力ロッドの旋回溝が伝動ボールを介して収容孔の操作溝に強力にねじ込まれて、出力ロッドがピストンに対して上記の所定位置よりも周方向に行き過ぎた位置で停止される。
また、旋回溝や操作溝や伝動ボールの摩耗によって伝動ボールと旋回溝との係合隙間の寸法および伝動ボールと操作溝との係合隙間の寸法が増加されることにより、出力ロッドがピストンに対して上記の所定位置よりも周方向に行き過ぎた位置で停止される。
本発明の目的は、旋回式クランプの出力ロッドを周方向の所定位置に確実に停止させることができる旋回式クランプを提供することにある。
ハウジング1内にピストン4が軸方向へ移動可能に挿入される。前記ピストン4に収容孔5が軸方向に形成される。前記収容孔5に出力ロッド6が軸方向へ移動可能に挿入される。前記ピストン4と前記出力ロッド6との間に装着される付勢手段9が、前記ピストン4と前記出力ロッド6とを離間させるように付勢する。前記ピストン4の基端側に作動室15が形成され、その作動室15に圧力流体が供給および排出される。前記ピストン4を軸方向の基端側へ付勢するように前記ハウジング1内で前記ピストン4の先端側にロックバネ16が設けられる。前記ピストン4の軸方向への移動が変換機構22によって前記出力ロッド6の旋回運動に変換される。前記収容孔5の内周壁および前記出力ロッド6の外周壁のうちのいずれか一方に案内溝28が周方向に形成され、その案内溝28の周方向の端部に係止部29が形成される。前記収容孔5の内周壁および前記出力ロッド6の外周壁のうちの他方に設けられる係合部材31が、前記案内溝28に挿入される。その係合部材31が前記係止部29に当接可能に周方向に所定の間隔をあけて対面される。
上記の旋回式クランプでは、係合部材が案内溝の係止部に周方向に受け止め可能となるように構成されることにより、出力ロッドがピストンに対して周方向の所定位置に確実に停止される。
(1) 前記変換機構22は、操作溝23と旋回溝24と循環溝25と伝動部材26とを有する。前記収容孔5の内周壁に操作溝23が螺旋状に形成される。前記出力ロッド6の外周壁に旋回溝24が形成される。前記出力ロッド6の外周壁に形成される循環溝25が、前記旋回溝24の基端部24aと前記旋回溝24の先端部24bとを軸方向へ連通させる。前記操作溝23と前記旋回溝24との間および前記収容孔5の内周面と前記循環溝25との間に伝動部材26が挿入される。
この場合、ピストンを軸方向へ押す力を操作溝と伝動部材と旋回溝とを介して出力ロッドに確実に伝達させることができる。
この場合、ピストンが所定の位置に移動されたことが検出弁によって確実に検出される。
この場合、ピストンが所定の位置に移動されると、そのピストンが弁部材を操作して弁部材が弁座から離間される。これにより、確実に検出される。
以下、本発明の第1実施形態を図1から図3Cによって説明する。
この実施形態では、シリンダ装置をワーク固定用の旋回式クランプに適用した場合を例示してある。まず、図1に基づいて上記の旋回式クランプの全体構造を説明する。
上記ピストン4の上側にバネ室14が形成されると共に、ピストン4の下側に作動室15が形成される。バネ室14内にロックバネ16が装着され、そのロックバネ16がハウジング1の上壁1cに対してピストン4を下方へ付勢する。そのバネ室14には、外気と連通する呼吸孔14aが連通される。また、作動室15に圧油(圧力流体)を給排する給排路17が、ハウジング1の胴部1bに形成される。
図1のリリース状態では、作動室15に圧油が供給されている。その作動室15の圧油がピストン4をロックバネ16の付勢力に抗して上方へ押圧することにより、そのピストン4の収容孔5の底壁が出力ロッド6の下端部を上方へ押動させている。これにより、出力ロッド6の高さ方向の途中部に形成された段差部6aが、ハウジング1の上壁1cに装着されたスラストベアリング34に上限位置で受け止められている。
上記の旋回式クランプでは、出力ロッド6の係合ピン31がピストン4の案内溝28の係止部29に周方向から受け止め可能に構成される。これにより、ピストン4が変換機構22を介して出力ロッド6を周方向の所定位置に確実に停止させることができる。その結果、クランプアームがワーク上の所定位置で当該ワークを押圧できる。
図4Aから図4Cは、本発明の第2実施形態を示している。この第2実施形態においては、上記の第1実施形態の構成部材と同じ部材(または類似する部材)には原則として同一の参照数字を付けて説明する。
前記の第1装着孔38に第1検出弁40の弁ケース41が保密状に螺合される。弁ケース41の左部に第1弁孔(弁孔)42が形成される。その弁ケース41の筒壁に第1連通孔43が形成され、その第1連通孔43によって第1供給路36と第1弁孔42とが連通される。その第1弁孔42の内周壁にテーパー状の第1弁座(弁座)44が形成される。第1弁孔42内に第1係合ボール(弁部材)45と第1進出バネ(付勢手段)46とが装着され、その第1進出バネ46によって第1係合ボール45が第1弁座44に向けて付勢される。
前記の第2装着孔39に第2検出弁50の弁ケース51が保密状に螺合される。弁ケース51の左部に第2弁孔(弁孔)52が形成される。その弁ケース51の筒壁に第2連通孔53が形成され、その第2連通孔53によって第2供給路37と第2弁孔52とが連通される。その第2弁孔52の内周壁にテーパー状の第2弁座(弁座)54が形成される。第2弁孔52内に第2係合ボール(弁部材)55と第2進出バネ(付勢手段)56とが装着され、その第2進出バネ56によって第2係合ボール55が第2弁座54に向けて付勢される。
図4Aから図4Cのリリース状態では、作動室15に供給された圧油によってピストン4が上限位置へ移動されている。
このとき、図4Aおよび図4Bに示すように、ピストン4の第1係合溝47が第1係合ボール45を右方へ移動させている。このため、その第1係合ボール45が第1弁座44から離間されている。従って、第1検出弁40は、開弁されている。これにより、第1供給路36内の圧縮エアが、第1連通孔43と第1弁孔42と開弁隙間と第1係合溝47と第1退避溝48と呼吸孔14aとを通って外部へ排出される。
また、図4Aおよび図4Cに示すように、ピストン4の第2退避溝58に第2係合ボール55が挿入されている。このため、上記の第2進出バネ56によって第2係合ボール55が第2弁座54に当接されている。従って、第2検出弁50は、閉弁されている。これにより、第2供給路37の圧縮エアの圧力が上昇し、その圧力上昇が(図示しない)圧力センサによって検出される。その結果、ピストン4がリリース位置(上限位置)に移動されていることが検出される。
引き続いて、クランプアーム7の左端部がワーク(図示しない)に上方から当接される。その結果、上記の旋回式クランプが図1のアンクランプ状態から図2のクランプ状態に切換えられる。このとき、第1検出弁40の第1係合ボール45が第1退避溝48に挿入される。このため、第1進出バネ46が第1係合ボール45を左方へ移動させ、その第1係合ボール45が第1弁座44に当接される。これにより、第1供給路36内の圧縮エアの圧力が上昇され、その上昇圧力が(図示しない)圧力センサによって検出される。その結果、ピストン4がロック位置(下降位置)に移動されていることが検出される。
本実施形態において、ロック検出用エアを排出する第1排出路(排出路)は、シリンダ孔2と第1係合溝47および第1退避溝48との間に形成される空間と、呼吸孔14aとによって構成される。また、リリース検出用エアを排出する第2排出路(排出路)は、シリンダ孔2と第2係合溝57および第2退避溝58との間に形成される空間と、呼吸孔14aとによって構成される。
上記の圧力流体は、例示した圧油に代えて、他の液体または圧縮空気等の気体であってもよい。
前記係合ピン31を装着する凹部30は、出力ロッド6の外周壁に形成されるのに代えて、ピストン4の収容孔5の内周壁に形成されてもよい。また、上記の案内溝28は、ピストン4の収容孔5の内周壁に形成されるのに代えて、出力ロッド6の外周壁に形成されてもよい。
その他に、当業者が想定できる範囲で種々の変更を行えることは勿論である。
Claims (4)
- ハウジング(1)内に軸方向へ移動可能に挿入されるピストン(4)と、
前記ピストン(4)に軸方向に形成される収容孔(5)と、
前記収容孔(5)に軸方向へ移動可能に挿入される出力ロッド(6)と、
前記ピストン(4)と前記出力ロッド(6)との間に装着されると共に、前記ピストン(4)と前記出力ロッド(6)とを離間させるように付勢する付勢手段(9)と、
前記ピストン(4)の基端側に形成されると共に、圧力流体が供給および排出される作動室(15)と、
前記ピストン(4)を軸方向の基端側へ付勢するように前記ハウジング(1)内で前記ピストン(4)の先端側に設けられるロックバネ(16)と、
前記ピストン(4)の軸方向への移動を前記出力ロッド(6)の旋回運動に変換させる変換機構(22)と、
前記収容孔(5)の内周壁および前記出力ロッド(6)の外周壁のうちのいずれか一方に周方向に形成される案内溝(28)であって、その案内溝(28)の周方向の端部に形成された係止部(29)を有する案内溝(28)と、
前記収容孔(5)の内周壁および前記出力ロッド(6)の外周壁のうちの他方に設けられる係合部材(31)であって、前記案内溝(28)に挿入されると共に、前記係止部(29)に当接可能に周方向に所定の間隔をあけて対面される係合部材(31)と、を備える、
ことを特徴とする旋回式クランプ。 - 請求項1の旋回式クランプにおいて、
前記変換機構(22)は、
前記収容孔(5)の内周壁に螺旋状に形成される操作溝(23)と、
前記出力ロッド(6)の外周壁に形成される旋回溝(24)と、
前記旋回溝(24)の基端部(24a)と前記旋回溝(24)の先端部(24b)とを軸方向へ連通させるように前記出力ロッド(6)の外周壁に形成される循環溝(25)と、
前記操作溝(23)と前記旋回溝(24)との間および前記収容孔(5)の内周面と前記循環溝(25)との間に挿入される伝動部材(26)と、を備える、
ことを特徴とする旋回式クランプ。 - 請求項1または2の旋回式クランプにおいて、
検出用の圧力流体が供給されるように前記ハウジング(1)に形成される流路と、
前記ピストン(4)によって前記流路を開閉させる検出弁(40,50)であって、前記流路に設けられる検出弁(40,50)と、を備え、
前記流路は、
前記ハウジング(1)内に形成される供給路(36,37)と、
前記供給路(36,37)に連通されるように前記検出弁(40,50)内に形成される弁孔(42,52)と、
前記弁孔(42,52)に連通されるように前記ハウジング(1)と前記ピストン(4)との間に形成される排出路と、を備える、
ことを特徴とする旋回式クランプ。 - 請求項3の旋回式クランプにおいて、
前記検出弁(40,50)は、
前記弁孔(42,52)の内周壁に形成される弁座(44,54)と、
前記弁座(44,54)に当接可能となるように前記弁孔(42,52)内に進退可能に挿入される弁部材(45,55)であって、前記弁孔(42,52)内に設けられる付勢手段(46,56)によって前記ピストン(4)に向けて付勢される弁部材(45,55)と、を備える、
ことを特徴とする旋回式クランプ。
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CN201880014680.9A CN110418693B (zh) | 2017-04-05 | 2018-03-14 | 回转式夹紧装置 |
US16/482,807 US11110560B2 (en) | 2017-04-05 | 2018-03-14 | Rotary clamp |
EP18780790.4A EP3563970B1 (en) | 2017-04-05 | 2018-03-14 | Rotary clamp |
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US11130212B2 (en) * | 2019-02-07 | 2021-09-28 | Raytheon Technologies Corporation | Infinitely directional translating clamp for welding a fan blade cover |
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CN110418693A (zh) | 2019-11-05 |
KR102158175B1 (ko) | 2020-09-22 |
CN110418693B (zh) | 2021-04-06 |
EP3563970A1 (en) | 2019-11-06 |
US11110560B2 (en) | 2021-09-07 |
KR20190109462A (ko) | 2019-09-25 |
US20200230757A1 (en) | 2020-07-23 |
JPWO2018186136A1 (ja) | 2019-11-14 |
EP3563970B1 (en) | 2021-07-14 |
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JP6749033B2 (ja) | 2020-09-02 |
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