JPS6131202Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cylinder device that converts the reciprocating motion of the piston of a double-acting cylinder into rotary motion and outputs it, and the rotation angle of the rotary motion to be output can be set and changed as appropriate. The present invention aims to provide a cylinder device.

This type of cylinder device is widely used, for example, as a drive device for automatically controlling an on-off valve by automatically rotating an operating shaft that opens and closes a valve body of the on-off valve. The cylinder device that opens and closes the on-off valve in this way is generally of the double-acting cylinder type, in which two pistons are arranged inside the cylinder, and a pressure chamber is formed on the back side of both pistons, and the on-off valve is opened and closed between the pistons. A conversion mechanism that inserts the tip of the operating shaft that opens and closes the valve body and converts the linear motion of this operating shaft and both pistons into rotational motion, such as a conversion mechanism that uses a rack and pinion or a conversion mechanism that uses a swinging lever. Pressure fluid is supplied to either side of the back surface of the piston to cause the piston to reciprocate, and in conjunction with this, the operating shaft is rotated to control the on-off valve.

However, in the cylinder device with the above configuration, when pressure fluid is supplied to one pressure chamber, the piston moves due to the thrust, but the piston moves the stroke set by the cylinder from one end to the other end. Move all the way to the department without stopping on the way,
The valve body of the on-off valve is fully open when open.
When closed, it is fully closed, and the valve body cannot be stopped at an intermediate position, and the flow path can only be simply controlled to open and close, and the flow rate cannot be adjusted by adjusting the angle of the valve body. The above-mentioned cylinder device had a drawback in that it was not possible to control the opening and closing of a flow rate regulating valve that required flow rate adjustment. Various types of compound cylinders have been proposed in which the movement of the piston is stopped midway, but all of them have the drawback of being complex in structure.

This invention is an improvement and elimination of the above-mentioned conventional problems.A stopper cylinder is added to the double-acting cylinder to stop the piston of the double-acting cylinder at an arbitrary position, and the stopper piston is connected to the double-acting cylinder. It is designed so that it can be driven by pressure fluid from the same source.

The configuration of this invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, numeral 1 is a double-acting cylinder that outputs rotational motion, and 2R and 2L are stopper cylinders mounted on both sides of the double-acting cylinder 1, which constitute a cylinder device. The double acting cylinder 1
The housing 4 includes a housing 4 rotatably installed with an output shaft 3 arranged in a direction orthogonal to the axial direction of the cylinder and connected to an operating shaft (not shown) of an on-off valve, and a housing 4 on both sides of the housing 4. Consisting of cylinder pipes 5, 6 of the same diameter that are fitted and fixed, and common intermediate flanges 7, 8 that are fitted and fixed to the open ends of both cylinder pipes 5, 6, and Drive pistons 9 and 10 are slidably arranged. 1
Reference numeral 1 denotes a rack disposed within the double-acting cylinder 1 with tooth surfaces 11a facing downward, and threaded portions 12 formed at both ends.
Driving pistons 9 and 10 are screwed and connected to a and 12b, respectively, so that the driving pistons 9 and 10 and the rack 11 operate together. 1
3 is a pinion attached to the output shaft 3, and key 1
4, the tooth surface 13a thereof meshes with the tooth surface 11a of the rack 11 to constitute a conversion mechanism,
The reciprocating motion (linear motion) of the rack 11 is caused by the pinion 13
The rotational motion is converted into rotational motion, and the operating shaft is rotationally driven. A pressure chamber 16 that communicates with the first port 17 of the intermediate flange 7 corresponding to the pressure chamber 15 formed on the back side of one drive piston 9 of the double-acting cylinder 1 and formed on the back side of the other drive piston 10. communicates with the second port 18 of the corresponding intermediate flange 8. The stopper cylinder 2R installed on the right side of the double-acting cylinder 1 consists of a cylinder pipe 21R that is fitted and fixed to the right intermediate flange 7 and an end cap 22R that is fitted and fixed to the open end of the cylinder pipe 21R. A stopper piston 23R is slidably disposed inside the pipe 21R, and the tip of the stopper rod 24R connected to the stopper piston 23R is connected to the intermediate flange 7.
The drive piston 9 is slidably penetrated through the center hole 7a of the cylinder 1 and protrudes into the pressure chamber 15 of the double-acting cylinder 1.
are placed facing each other. Stopper rod 24R
A portion near the outer member is a guide pipe 2 screwed so as to pass through the center of the end cap 22R.
7R, and is slidably supported. A stopper 25R is screwed onto the outer end of the stopper rod 24R for adjusting the maximum length of the stopper rod 24R protruding into the pressure chamber 15.
The above guide pipe 27R is the stopper rod 24
R is slidably supported, the guide pipe 27R is screwed in the axial direction with respect to the end cap 22R, and the length of the guide pipe 27R protruding into the piston back chamber 26R' is adjusted.
Adjust the retreat end of the stopper piston 23R. That is, the rearward end position of the stopper rod 24R is adjusted. In addition, 28R is the guide pipe 27
It is R's lock nut. A piston front chamber 26R formed on the front side of the stopper piston 23R of this stopper cylinder 2R communicates with the third port 19 of the intermediate flange 7, and a piston back chamber 26R' formed on the back side communicates with the fifth port 19 of the end cap 22R. It communicates with port 27. A stopper cylinder 2L arranged on the left side of the double-acting cylinder 1 is a cylinder pipe 2 that is fitted and fixed to the left intermediate flange 8.
1L and an end cap 22L that is fitted and fixed to the open end of the cylinder pipe 21L, and a stopper piston 23L is installed inside the cylinder pipe 21L.
is arranged slidably, and this stopper piston 2
The tip of the stopper rod 24L connected to the stopper rod 3L is slidably passed through the center hole 8a of the intermediate flange 8, protrudes into the pressure chamber 16 of the double-acting cylinder 1, and is disposed opposite to the drive piston 10. A portion near the outer end of the stopper rod 24L is slidably supported by a guide pipe 27L that is threaded through the center of the end cap 22L. A stopper 2 is provided at the outer end of the stopper rod 24L for adjusting the maximum protrusion length of the stopper rod 24L within the pressure chamber 16.
5L is screwed on. The guide pipe 27L slidably supports the stopper rod 24L, and also allows the guide pipe 27L to screw in the axial direction relative to the end cap 22L, thereby controlling the length of the guide pipe 27L protruding into the piston back chamber 26L'. By adjusting, the retreating end of the stopper piston 23L is adjusted. That is, stopper rod 2
Adjust the rearward end position of 4L. In addition, 28L is a lock nut of the guide pipe 27L. Stopper piston 2 of this stopper cylinder 2L
A piston front chamber 26L formed on the front surface of the piston 3L communicates with the fourth port 20 of the intermediate flange 8, and a piston back chamber 26'L formed on the rear surface communicates with the sixth port 28 of the end cap 22L. and intermediate flanges 7, 8 and end cap 22
Each port 17, 18, 1 formed in R, 22L
Fluid is supplied to 9, 20, 27, and 28 in a controlled manner.

To explain the operation of the above structure, first, as shown in FIG. 2, the stopper cylinder 2R,
Fluid is supplied to the 2L piston back chambers 26R', 26L' from the fifth port 27 and sixth port 28 formed in the end caps 22R, 22L, respectively, and the stopper pistons 23R, 23L are moved to the front chamber side, and the stopper rod is moved. 24R and 24L are projected into the double-acting cylinder 1, and the tip of one of the stopper rods 24R is brought into contact with the driving piston 9 of the double-acting cylinder 1. In this state, the first port 1 of the intermediate flange 7 is connected to one pressure chamber 15 of the double-acting cylinder 1.
When fluid is supplied from 7 and the fluid in the other pressure chamber 16 is discharged from the second port 18 of the intermediate flange 8, the drive pistons 9 and 10 move to the left in the figure, and the drive piston 10 moves to the stopper cylinder. 2L
The rack 11 also moves as the drive pistons 9 and 10 move, and the pinion 13 meshing with the rack 11 rotates, causing the output shaft 3 to move counterclockwise. Rotate it. (See Figure 3). Next, fluid is supplied to the piston front chamber 26L of the left stopper cylinder 2L from the fourth port 20 of the intermediate flange 8, and the fluid in the piston back chamber 26L' is supplied to the end cap 22L.
When the piston 23L is discharged from the sixth port 28 of the rack 11, the stopper piston 23L moves to the back chamber side, and the drive pistons 9 and 10, which were stopped by the stopper rod 24L, further move to the left. moves and output shaft 3 via pinion 13
(See Figure 4). Next, fluid is supplied to the other pressure chamber 16 of the double-acting cylinder 1 from the second port 18 of the intermediate flange 8, and the fluid in one pressure chamber 15 is discharged from the first port 17 of the intermediate flange 7. The pistons 9 and 10 move to the right in the figure, and the rack 11 is moved together with the drive pistons 9 and 10.
is also moved to the right, causing the output shaft 3 to rotate clockwise via the pinion 13 meshing with the rack 11. The drive pistons 9, 10 are stopped from moving when one of the drive pistons 9 comes into contact with the stopper rod 24R of the right stopper cylinder 2R.
Next, fluid is supplied from the fifth port 19 of the intermediate flange 7 to the piston front chamber 26R of the stopper cylinder 2R located on the right side, and the piston back chamber 26
When the fluid in R' is discharged from the fifth port 27 of the end cap 22R, the stopper piston 2
3R moves to the back chamber side and this stopper rod 2
Drive pistons 9, 1 stopped at 4R
0 moves to the right together with the stopper piston 23R, the rack also moves to the right, and the output shaft 3 is rotated clockwise via the pinion 13.

Also, attach the stopper 25R to the stopper rod 2.
The final protrusion amount of the stopper rod 24R can be adjusted by screwing it on the end cap 22R.
By screwing the stopper piston 23R, the retracting end of the stopper rod 24R can be adjusted. This also applies to the stopper cylinder 2L side.

During the above operation, in order to reliably stop the movement of the drive pistons 9, 10 of the double-acting cylinder 1 with the stopper pistons 23R, 23L of the stopper cylinders 2R, 2L, the stopper pistons 23R, 2L must be
The operating force of 3L must be set larger than the operating force of the drive pistons 9 and 10. The pressure of the fluid that operates the stopper pistons 23R, 23L is set higher than the pressure of the fluid that operates the drive pistons 9, 10, or the diameter of the stopper pistons 23R, 23L is set larger than the diameter of the drive piston 9. I have to. However, with the structure of this invention, the stopper cylinder 2
It is easy to change the diameters of R and 2L, and by appropriately setting the diameters of the stopper pistons 23R and 23L, the difference in efficiency allows them to function as a stopper. Since the operating force of the drive unit 1 is consumed by the operating torque of driven parts such as valves, for example, the drive pistons 9 and 10 and the stopper pistons 23R and 23L
Even if the diameters of the two pistons are the same, the stopper piston can completely stop the drive piston in the middle of its stroke. Depending on the application, the stopper piston can also be used on only one side.

In this way, the double-acting cylinder 1 can stop the movement of the drive pistons 9, 10 and the rack 11 midway through the stopper cylinders 2R, 2L arranged on both sides, so both the stopper cylinders 2R, The stopper piston 23 starts from the longest stroke when the 2L stopper piston retracts.
The amount of movement of the rack 11 can be appropriately set while R and 23L reach the shortest protruding stroke, and the rack 11 is rotated via the pinion 13 accordingly. The rotation angle of the output shaft 3 can also be set arbitrarily. Therefore, if the opening/closing control of the valve body of the valve is performed on the output shaft 3, the opening degree of the valve body can be arbitrarily set, and the flow rate can be adjusted.

As explained above, this invention consists of a double-acting cylinder in which two pistons are connected by a rod and a pressure chamber is formed on the rear chamber side of both pistons, and a double-acting cylinder is attached to both ends of the double-acting cylinder, and A stopper cylinder has a stopper rod slidably supported by the end cap, the tip of which projects into the pressure chamber of the double-acting cylinder, the rear end of which projects from the end cap, and a stopper screwed onto the projecting end; A cylinder device comprising an operating shaft rotatably mounted in the center of a moving cylinder so as to be orthogonal to the axial direction, and a power conversion means that converts the axial movement of the double-acting cylinder into rotational motion and transmits it to the operating shaft. A guide pipe is screwed into the end cap of the stopper cylinder, and the stopper rod is slidably supported by the guide pipe, so that the stopper cylinder can appropriately stop the piston of the double-acting cylinder during its movement. The amount of movement of the piston of the double-acting cylinder can be arbitrarily set between the state in which both stopper cylinders are retracted and the state in which both stopper cylinders are extended, and the movement can be stopped. The rotation angle of the output shaft that is rotatably driven via the pinion can be set arbitrarily, and if this output shaft is applied to the operating shaft of the opening/closing valve, the opening degree of the valve body can be set arbitrarily. This makes it possible to adjust the flow rate. Furthermore, it is sufficient to simply arrange stopper cylinders on both sides of the double-acting cylinder, which simplifies the structure. Also, the rotation angle of the rotation axis can be changed using the stopper 25.
R, 25L and guide pipes 27R, 27L
The rotation angle can be adjusted without disassembling the device or replacing it with new parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a cylinder device according to the present invention, and FIGS. 2 to 4 are sectional views showing the operating state of the cylinder device. 1... Double acting cylinder, 2R, 2L... Stopper cylinder, 3... Output shaft, 7, 8... Intermediate flange, 9, 10... Drive cylinder, 11... Rack, 13... Pinion, 23R, 23L...stopper piston.

Claims (1)

[Scope of utility model registration request] A double-acting cylinder in which two pistons are connected by a rod and a pressure chamber is formed on the rear chamber side of both pistons, and a double-acting cylinder is attached to both ends of the double-acting cylinder, and
A stopper rod slidably supported by the end cap has its tip projected into the pressure chamber of the double-acting cylinder, and its rear end projected from the end cap;
A stopper cylinder with a stopper screwed onto the protruding end, an operating shaft rotatably attached to the center of the double-acting cylinder perpendicular to the axial direction, and converting the axial movement of the double-acting cylinder into rotational motion. In a cylinder device comprising a power converting means for converting power and transmitting it to an operating shaft, a guide pipe passing through the axial center of the end cap of the stopper cylinder is screwed, and the stopper rod can be slid by the guide pipe. A cylinder device characterized in that the length of the guide pipe protruding into the piston back chamber can be adjusted by supporting the guide pipe in the axial direction with respect to the end cap. .