JPH0547508U - 3-position stop actuator - Google Patents

Abstract

(57) [Summary] [Purpose] The installation space is small, and it is possible to accurately stop at the forward end, the backward end, and the intermediate position, and the stop position can be easily adjusted. [Structure] The first rod 1 is provided in the first cylinder 110.
A pressure receiving piston 114 that is connected to 13 and divides the pressurizing chambers 110A and 110B is provided. Free piston to form 1
24 and a stopper 125 that restricts the stroke of the free piston 124, and is provided in the adjustment cylinder 130.
Adjustment tube 131 having interference portions 131b and 132b
The adjustment rod 132 is inserted, and the outer ends of the first and second rods 113 and 123 are connected to each other via the tip block 140.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a three-position stop cylinder device that can be stopped at a forward end, a backward end, and one point in between.

[0002]

[Prior Art]

 When using a fluid pressure actuator to perform an operation of stopping at three positions of the forward end, the backward end and the middle thereof, as shown in FIG. 6, for example, a movable actuator b is attached to the rod tip of the fixed actuator a. It is known to provide the same, or as shown in FIG. 7, to provide a stopper actuator d for advancing and retracting the rod toward the middle of the reciprocating range of the rod tip of the first actuator c.

[0003]

[Problems to be solved by the device]

 However, according to the structure shown in FIG. 6, since the fixed actuator a and the movable actuator b are arranged in series, the mounting space becomes long, and the movable actuator b that moves by the fixed actuator a is also increased. There is a problem of dragging the piping and wiring. Further, according to the structure of FIG. 7, since the intermediate stop position of the first actuator c is defined by the interference with the rod of the stopper actuator d, it is difficult to adjust or change the intermediate stop position. Moreover, as shown in FIG. 8, when the first actuator c is re-advanced from the intermediate stop position, the rod of the stopper actuator d must be retracted. First, since it is impossible unless the first actuator b is moved backward, there is a problem that the control is complicated and a quick processing operation cannot be performed.

The present invention has been made in view of the above problems, and an object thereof is to provide a short axial mounting length and accurately stop at a forward end, a backward end, and an intermediate position therebetween. Another object of the present invention is to provide a three-position stop cylinder device that can be adjusted and can adjust the stop position.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, a three-position stop actuator according to a first aspect of the present invention integrally includes first and second cylinders parallel to each other on a main body and an adjusting cylinder, and A first rod that is airtightly inserted from one end, and a pressure receiving piston that is connected to the first rod and divides the pressure chambers on both sides in the axial direction. A second rod inserted in the same direction as the first rod, and a free piston that is not connected to the second rod and defines a second rod-side open chamber and an anti-rod-side pressurizing chamber. And a stopper provided in the open chamber for restricting the forward stroke of the free piston to be shorter than the forward stroke of the pressure receiving piston, and the adjustment tube loosely fitted in the adjustment tube and its inner circumference is provided in the adjustment cylinder. Straightening rod inserted The adjustment tube and the adjustment rod are provided with an interference portion that interferes with each other in the axial direction to regulate the forward stroke of the pressure receiving piston, and the first and second rods are connected to each other via a tip block. One of the adjusting tube and the adjusting rod is fixed to the tip block and the other is fixed to the adjusting cylinder.

Further, a three-position stop actuator according to a second aspect of the present invention is the three-position stop actuator according to the first aspect, wherein the first and second rods are fixed to the tip block. The position is adjustable.

A three-position stop actuator according to a third aspect of the present invention is the three-position stop actuator according to the first or second aspect, wherein the adjustment tube and the adjustment rod are the tip block or A fixed position is adjustable with respect to the adjusting cylinder.

[0008]

[Action]

 In the above structure, fluid pressure is supplied to the pressure chamber on the first rod side of the first cylinder, and the pressure chamber on the non-rod side of the first cylinder and the pressure on the non-rod side of the second cylinder are applied. When the pressure chamber is opened, the first rod retracts by the pressure-receiving piston in the first cylinder that receives fluid pressure, so the tip block retracts and stops at the retracted end (return end) position. At this time, the second rod and the free piston, which are integrated with the tip block, also retract at the same time.

Next, if the pressure chamber on the side opposite to the rod in the second cylinder is pressurized while the pressure chamber on the first rod side in the first cylinder is pressurized, the first rod in the pressure receiving piston Since the pressure receiving area on the side opposite to the rod in the free piston in the second cylinder is larger than the pressure receiving area on the side by the cross-sectional integral of the first rod, it moves until the free piston interferes with the stopper that defines the intermediate stop position. This causes the tip block to stop at the intermediate position. At this time, due to the pressure input to the pressure chamber on the first rod side in the first cylinder and the pressure chamber on the opposite rod side in the second cylinder, the tip block is not stopped at the intermediate stop position. Retained.

When the pressure chamber on the side opposite to the rod in the first cylinder is pressurized, the pressure receiving piston in the first cylinder moves forward, and the second rod in the second cylinder moves to the stop. Since it is not connected to the free piston stopped due to the interference with the spacer, it is possible to move away from this free piston following the forward movement of the first rod and the tip block. The block moves forward from the intermediate stop position. Then, the forward movement operation is stopped when the adjustment tube and the interference portion of the adjustment rod, which move relative to each other in the pull-out direction by the forward movement of the tip block, interfere with each other.

The intermediate stop position of the tip block can be arbitrarily set by adjusting the fixing position of the tip block and the second rod.

Further, the stop position at the forward end of the tip block is adjusted by adjusting the fixed position of the adjustment tube and the adjustment rod with respect to the tip block or the body body, and changing the mutual interference position of the adjustment tube and the adjustment rod. It can be set arbitrarily.

[0013]

【Example】

 Next, the three-position stop actuator of the present invention will be described with reference to an embodiment shown in FIGS.

Reference numeral 100 denotes a main body, and inside the body 100, a first pneumatic cylinder 110 and a second pneumatic cylinder 120 having the same diameter, and an adjusting cylinder 130 between the pneumatic cylinders 110 and 120 are provided. Are formed in parallel with each other. Head covers 111 and 121 are respectively sealed to one ends (upper ends in the illustrated example) of the first and second pneumatic cylinders 110 and 120, and inner circumferences of the other ends (lower ends in the illustrated example). Linear ball bearings 112 and 122 are respectively fixed to the.

A first rod 113 made of a hard metal is inserted into the first pneumatic cylinder 110 via the linear ball bearing 112 so as to be movable in the axial direction, and the first pneumatic cylinder 110 is also mounted. A pressure receiving piston 114 that divides the inside of 110 into two pressurizing chambers 110A and 110B is provided in an airtight and slidable manner. The axial circumference of the first rod 113 is sealed by a rod seal 115 provided on the axially outer side of the linear ball bearing 112, and the inner end 113a of the first rod 113 is provided with the pressure receiving member. It is screwed and connected to the piston 114. An input port 116A for supplying and exhausting air pressure to and from the pressurizing chamber 110A on the lower side of the pressure receiving piston 114, that is, on the side of the first rod 113 is formed on one side surface of the main body 100, and the head cover 111 is provided on the head cover 111. An input port 116B for supplying and exhausting air pressure to and from the pressurizing chamber 110B on the side of the head cover 111, that is, on the side opposite to the rod is provided.

In the second pneumatic cylinder 120, a second rod 123 made of the same material as the first rod 113 is inserted through the linear ball bearing 122 so as to be movable in the axial direction. A free piston 124, which is not connected to the inner end 123a of the second rod 123, is airtightly slidably provided. The free piston 124 includes an open chamber 120A that is open to the atmosphere inside the second pneumatic cylinder 120 on the lower side, that is, on the side of the second rod 123 through the inner circumferential clearance of the linear ball bearing 122, and the head cover 121 side. That is, it is partitioned into the pressure chamber 120B on the side opposite to the rod, and the head cover 121 is provided with an input port 126 for supplying and discharging air pressure to and from the pressure chamber 120B. Further, a stopper 125 is fixed to the open chamber 120A so as to limit the forward stroke of the free piston 124 toward the open chamber 120A side to be shorter than the forward stroke of the pressure receiving piston 114.

The tip ends of the first and second rods 113 and 123 led out from the inner circumferences of the linear ball bearings 112 and 122 of the first pneumatic cylinder 110 and the second pneumatic cylinder 120 are the main body 100. Is connected to the tip blocks 140 that are movably arranged outside of the. Of these, the tip of the first rod 113 is fixed to the tip block 140 via a bolt 117, and the second rod 123 has a male screw portion 123b formed at its tip with an appropriate length on the tip block 140. It is screwed into the formed female screw portion 140 a and is tightened and fixed by the lock nut 127.

In the adjusting cylinder 130, an adjusting tube 131 and an adjusting rod 132 loosely fitted on the inner circumference thereof are inserted. Of these, the adjustment tube 131 is in a loose fitting state in which it can be inserted into and removed from the main body 100, a cover member 131a at the tip is fixed to the tip block 140 via a bolt 133, and the adjustment rod 1 32, a male screw portion 132a formed at an appropriate length at its tip is screwed into a female screw portion 130a formed at the end of the adjusting cylinder 130 on the side opposite to the tip block 140, and a lock nut 134 is formed. It is fastened and fixed with. An interference ring 131b is fixed to the inner circumference of the inner end of the adjustment tube 131, and a large-diameter interference head 132b is formed at the end of the adjustment rod 132 inside the adjustment tube 131. The interference ring 131b and the interference head 132b interfere with each other when the tip block 140 moves forward, that is, moves a predetermined amount in a direction away from the main body 100, and interferes with each other by the forward movement of the adjustment tube 131 to regulate the movement. Is.

The pipe 10 extending from the input port 116A of the first pneumatic cylinder 110 is connected via the switching port 150A of the three-position switching valve 150 and the pipe 20 extending from the input port 116B of the first pneumatic cylinder 110. The two-position switching valve 160 and the piping 30 extending from the input port 126 of the second pneumatic cylinder 120 via the switching port 150B of the three-position switching valve 150 are common to the piping 20. Via the switching port 150B of the valve 150, they are selectively connected to the air pressure supply source or the atmosphere open side, respectively. Air pressure is introduced into the two-position switching valve 160 via the branch pipe 40 from the pipe 10, and the position switching operation is performed by this air pressure.

Next, the operation of the three-position stop actuator of the present embodiment configured as described above will be described. First, in FIG. 1, the three-position switching valve 150 has the switching ports 150A and 150B connected to the switching position 151. The switching control is performed to the opened state. Therefore, the pressurizing chamber 110A in the first cylinder 110 is supplied with air pressure from the air pressure supply source via the switching port 150A of the three-position switching valve 150 and the pipe 10, and the first pneumatic cylinder 110 is also supplied. The pressurizing chamber 110B in FIG. 2 is opened to the atmosphere through the two-position switching valve 160 that has been switched to the switching position 161 by the air pressure applied from the pipe 10 through the branch pipe 40 and the pipe 20, and the second pneumatic cylinder 120 The pressurizing chamber 120B is open to the atmosphere via the pipe 30 and the switching port 150B of the three-position switching valve 150. Therefore, the pressure receiving piston 114 that receives the pressure in the pressurizing chamber 110A retracts toward the top dead center, and accordingly, the first rod 113, the tip block 140, the second rod 123, and the free piston 124 are integrated. The vehicle moves backward and stops at the retracted end position shown in the figure.

Next, by switching the three-position switching valve 150 to the switching position 152 from the state shown in FIG. 1, as shown in FIG. 2, the pressure chamber 110A in the first pneumatic cylinder 110 is supplied with air pressure. While the state is maintained, the air pressure is also supplied to the pressure chamber 120B on the side opposite to the rod in the second pneumatic cylinder 120 through the switching port 150B of the three-position switching valve 150 and the pipe 30. Further, the pressurizing chamber 110A on the side opposite to the rod in the first pneumatic cylinder 110 is kept open to the atmosphere via the two-position switching valve 160 at the switching position 161, as in FIG. Then, the pressure receiving surface 124a of the pressure receiving chamber 114B of the second cylinder 120 is larger than that of the pressure receiving surface 114a of the pressure receiving piston 114 of the first cylinder 110. Since the integral is large, the free piston 124 moves forward against the backward pressure received by the pressure receiving piston 114, and along with this, the second rod 123, the tip block 140, the first rod 113, and the pressure receiving piston 114. The piston 114 integrally moves forward. This forward movement is blocked by the free piston 124 coming into contact with the stopper 125, so that the leading end block 140 stops at the intermediate position shown.

At the intermediate stop position of the tip block 140 at this time, the lock nut 127 screwed into the male screw portion 123 b of the second rod 123 is loosened, and the second rod 123 is rotated in either the left or right direction. By appropriately changing the screwing positions of the male screw portion 123b and the female screw portion 140a of the tip block 140, the adjustment can be made arbitrarily. After the adjustment, the lock nut 127 is tightened to fix.

Further, by controlling the three-position switching valve 150 to switch to the switching position 153 from the state shown in FIG. 2, as shown in FIG. The pressurization chamber 120B in the second pneumatic cylinder 120 is opened to the atmosphere via the switching port 150A of the three-position switching valve 150, and the pressure chamber 120B in the second pneumatic cylinder 120 is the same as in FIG. Air pressure is supplied through 150B. Further, since the switching operation pressure from the branch pipe 40 to the two-position switching valve 160 is released by moving the three-position switching valve 150 to the switching position 153, the two-position switching valve 160 moves to the switching position 162. The air pressure is supplied to the pressurizing chamber 110B in the first pneumatic cylinder 110 via the switching port 150B of the three-position switching valve 150, the two-position switching valve 160, and the pipe 20. Therefore, the pressure receiving piston 114 further moves forward. At this time, since the second rod 123 is not connected to the free piston 124 stopped by the interference with the stopper 125, the second piston 123 is separated from the free piston 124, and the pressure receiving piston 114, the first rod 113, and The forward movement of the tip block 140 is followed. Then, the interference ring 131b of the adjustment tube 131, which moves forward together with the tip block 140 and moves so as to be pulled out from the adjustment rod 132, eventually causes the interference heads 132b of the adjustment rod 132 to interfere with each other. The tip block 140 stops at the forward end position shown.

At the stop position at the forward end of the tip block 140, the lock nut 134 screwed onto the male screw portion 132a of the adjusting rod 132 is loosened, and the adjusting rod 132 is rotated in either the left or right direction. It can be arbitrarily adjusted by appropriately changing the screwing position of the male screw portion 132a and the female screw portion 130a of the adjusting cylinder 130. After the adjustment, it is fixed by tightening the lock nut 134.

That is, according to the configuration of this embodiment, the operation control can be performed only by switching the three-position switching valve 150, and the stop position of the tip block 140 at the forward end, the backward end, and the intermediate position. Can also be adjusted arbitrarily, and since the first and second rods 113 and 123 are rotatably supported by the linear ball bearings 112 and 122, respectively, the tip block 140 does not rotate. , It stops with high position accuracy.

The present invention is not limited to the illustrated embodiment. For example, the linear ball bearings 112 and 122 may be replaced by slide bearings, the fixing position of the adjustment tube 131 may be adjustable with respect to the tip block 140, and other details such as shape and size may be arbitrarily changed. ..

[0027]

[Effect of the device]

 The three-position stop actuator of the present invention has the following effects. (1) Since the operating parts of each cylinder are built in parallel to a single body, the space occupied can be shortened. (2) The stop position of the tip block at the forward end, the backward end and the intermediate position can be easily adjusted at any time. (3) Since it is not a combination of a plurality of actuators with different advancing and retreating directions, the operation does not become complicated and quick operation is possible. (4) Since the tip block is supported by two rods, this tip block does not rotate, and since each rod is supported by the linear ball bearings, there is no rattling. It can be stopped at each position with high position accuracy. (5) Operation control can be performed with a single switching valve. (6) The position adjustment mechanism, rotation prevention mechanism, and guide mechanism are compactly unitized, and the structure is simple.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a three-position stop actuator of the present invention in a state of returning to a backward end.

FIG. 2 is a sectional view showing a stopped state at the intermediate position.

FIG. 3 is a sectional view showing a stopped state at the forward end as well.

FIG. 4 is an explanatory diagram showing an example of a conventional structure.

FIG. 5 is an explanatory view showing another example of the conventional structure when stopped at an intermediate position.

FIG. 6 is an explanatory diagram showing another example of the conventional structure when moving forward from an intermediate position.

[Explanation of symbols]

 10, 20, 30 Piping 40 Branch pipe 100 Main body 110 First pneumatic cylinder (first cylinder) 110A, 110B 120B Pressurizing chamber 111, 121 Head cover 112, 122 Linear ball bearing 113 First rod 113a, 123a In End 114 Pressure receiving piston 115 Rod seal 116A, 116B, 126 Input port 117, 133 Bolt 120 Second pneumatic cylinder (second cylinder) 120A Open chamber 123 Second rod 123b, 132a Male screw portion 124 Free piston 125 Stopper 127 , 134 Lock nut 130 Adjustment cylinders 130a, 140a Internal thread 131 Adjustment tube 131a Cover member 131b Interference ring (interference part) 132 Adjustment rod 132b Interference head (interference part) 1 40 Tip block 150 Three-position switching valve 150A, 150B Switching port 151, 152, 153 Three-position switching valve switching position 160 Two-position switching valve 161, 162 Two-position switching valve switching position

Claims (3)

[Scope of utility model registration request] 1. A first and second cylinders 110, 120 and an adjustment cylinder 130 which are parallel to each other on a main body 100.
And a first rod 113 that is hermetically inserted from one end into the first cylinder 110 and the pressure chambers 110 on both sides in the axial direction that are connected to the first rod 113.
A pressure receiving piston 114 for partitioning A and 110B is provided, and the first rod 113 is provided in the second cylinder 120.
The second rod 123 inserted in the same direction as the second rod 123 is not connected to the second rod 123, and the second rod 1
Open chamber 120A on the side of 23 and pressurizing chamber 120B on the side opposite to the rod
And a free piston 124 for partitioning the open chamber 120
A stopper 125, which is provided at A and limits the forward stroke of the free piston 124 to be shorter than the forward stroke of the pressure receiving piston 114, is provided in the adjustment cylinder 130. 132, the adjusting tube 131 and the adjusting rod 132 interfere with each other in the axial direction, and the pressure receiving piston 1
14, the first and second rods 113 and 123 are connected to each other via the tip block 140, and one of the adjustment tube 131 and the adjustment rod 132 is provided. A three-position stop actuator, wherein the tip block 140 and the other end are fixed to the adjusting cylinder 130. 2. The three-position stop actuator according to claim 1, wherein the first and second rods 113 and 123 are adjustable in fixed position with respect to the tip block 140. 3. The three-position stop actuator according to claim 1, wherein the adjustment tube 131 and the adjustment rod 132 are adjustable in fixed position with respect to the tip block 140 or the adjustment cylinder 130.