JP2013040666A - Piston valve device and driving method of piston valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piston valve device and a driving method of the piston valve device, superior in construction and maintainability, and superior in low cost and control responsiveness, by dispensing with a long air pipe up to a cylinder cover from a solenoid valve for piston reciprocating control, in the piston valve device for controlling a flow of fluid in the pipe by using compressed air.SOLUTION: This piston valve device includes a piston casing for connecting an opening part end surface of a yoke 50 connected to a valve body 40 and an opening part end surface of the cylinder cover 60 for forming an inner peripheral surface on a piston sliding surface, a piston 10 fitted to the piston sliding surface is connected with a stem 20 reciprocatably supported in the axial direction in the yoke and having a valve element 30 on its tip, and operation of the valve element is performed by reciprocating motion of the stem by the piston driven by using the compressed air. In the piston valve device, the solenoid valve 300 for controlling the compressed air in a switching system is provided on an outside one surface of the cylinder cover.

Description

  The present invention relates to a piston valve device that performs opening / closing control of a valve using compressed air, and a driving method of the piston valve device.

  The tire vulcanizer is equipped with upper and lower molds and a bladder that expands and contracts by supplying and discharging fluid. The tire vulcanizer presses the bladder expanded by supplying fluid to the inner surface of the raw tire housed inside the mold. Tires are vulcanized.

  The fluid used in the tire vulcanizer includes high-temperature and high-pressure steam, nitrogen gas, a mixed gas of steam and nitrogen gas, etc., and the piping portion of the tire vulcanizer uses compressed air. Piston valve devices that control the flow of fluid are widely used.

  The piston valve device has a valve body attached to the lower end of a stem connected to the piston, and moves the valve body up and down in conjunction with the up and down movement of the piston by air pressure and a spring. The flow path switching control is performed. The air that moves the piston down is an air flow provided at the top of the cylinder lid that engages with a solenoid valve that controls the air flow and a yoke that is connected to the upper part of the valve device body through piping connected to the solenoid valve. It is made to flow from an inlet (refer patent document 1: Unexamined-Japanese-Patent No. 8-14410).

  However, as described above, the plurality of valve devices constituting the valve unit are air-driven piston valves, and use high-pressure air for driving. Therefore, a long air pipe from the control solenoid valve to the cylinder lid is used. Need. Moreover, since copper piping is usually used as the air piping, a large amount of cost is required for its construction and maintenance. Furthermore, the fluid supplied to the tire vulcanizer and the fluid to be discharged are various in type, temperature, and pressure. The number of pipes connected and the opening and closing of the pipes connected to each pipe. When there are a large number of valve devices for controlling the piping, the piping for connecting the cylinder lid, which is the connection port of the piping for air, and the solenoid valve becomes complicated, and the distance becomes long. Therefore, the air loss becomes large, which is contrary to the energy saving requirement of the tire vulcanizer. Further, since compressible high-pressure air is used, there is a problem that the control response speed is inferior when the piping distance from the solenoid valve to the valve unit is increased.

JP-A-8-14410

  The present invention has been made in view of the above-described facts, and in a piston valve device for controlling the flow of fluid in a pipe using compressed air, which is used in a pipe part of a tire vulcanizer, the compressed air is applied to a cylinder lid. A solenoid valve that controls switching between supply, stop, and discharge of the cylinder, eliminates the need for long air piping from the solenoid valve for piston reciprocation control to the cylinder lid, is excellent in construction and maintainability, and is low in cost. An object of the present invention is to provide a piston valve device with a quick control response speed and a driving method of the piston valve device in response to the energy saving demand of the machine.

In order to solve the above-mentioned problem, a piston valve device according to claim 1,
An opening end face of the yoke connected to the valve body,
A piston casing having an inner peripheral surface coupled to an opening end surface of a cylinder lid formed on a piston sliding surface;
A stem fitted with the piston sliding surface is supported so as to be capable of reciprocating in the axial direction in the yoke, and a stem having a valve body at the tip thereof is connected,
A piston valve device in which a valve body is operated by reciprocating a stem by the piston driven using compressed air,
Provided on one outer surface of the cylinder lid with a solenoid valve for switching and controlling the compressed air,
It is characterized by that.

The invention according to claim 2 is the piston valve device according to claim 1,
A seal member is provided between the outer surface of the cylinder lid and the outer surface of the solenoid valve.
It is characterized by that.

In order to solve the above-mentioned problem, a driving method of a piston valve device according to claim 3,
An opening end face of the yoke connected to the valve body,
A piston casing having an inner peripheral surface coupled to an opening end surface of a cylinder lid formed on a piston sliding surface;
A stem fitted with the piston sliding surface is supported so as to be capable of reciprocating in the axial direction in the yoke, and a stem having a valve body at the tip thereof is connected,
In the piston valve device in which the valve body is operated by the reciprocating movement of the stem by the piston driven using compressed air,
An electromagnetic valve for switching and controlling the compressed air is disposed on the outer surface of the cylinder lid via a seal member,
Using the electromagnetic valve, the switching operation of the flow path is performed by a valve body that reciprocates by controlling the switching of the compressed air.
It is characterized by that.

  According to the present invention, in a piston valve device for controlling the flow of fluid in a pipe using compressed air, which is used in a pipe part of a tire vulcanizer, switching control of supply, stop, and discharge of compressed air to a cylinder lid is performed. The solenoid valve is equipped with a long air piping from the solenoid valve for reciprocating piston control to the cylinder lid, is excellent in construction and maintainability, is low-cost, and responds to energy-saving demands of tire vulcanizers. A piston valve device having a high speed and a driving method of the piston valve device can be obtained.

Schematic configuration showing a tire vulcanizer and piping structure using a piston valve device according to the present invention The longitudinal cross-sectional view which shows 1st Embodiment of the piston valve apparatus which concerns on this invention Sectional drawing which shows the connection structure of the piston valve and electromagnetic valve which concern on this invention The longitudinal cross-sectional view which shows 2nd Embodiment of the piston valve apparatus which concerns on this invention The longitudinal cross-sectional view which shows other embodiment of the piston valve apparatus which concerns on this invention Sectional drawing which shows the connection structure of the piston valve and solenoid valve in other embodiment of the piston valve apparatus which concerns on this invention The longitudinal cross-sectional view which shows the modification of the piston valve apparatus which concerns on this invention A longitudinal sectional view showing a piping system between a piston valve and a solenoid valve in a conventional piston valve device

  Next, examples as specific examples of embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples. Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate. Throughout the drawings, the same or corresponding components are denoted by the same reference numerals.

(Schematic configuration of tire vulcanizer)
FIG. 1 is a schematic view showing a tire vulcanizer equipped with a piston valve device according to the present invention and a piping structure connected thereto. The tire vulcanizer includes a main body and an in-machine piping system. The tire vulcanizer body includes an upper and lower vulcanizing mold that defines the outer shape of the tire, a substantially bag-like bladder 3 that can be expanded and contracted, and a bladder that holds the bladder 3. A holding means, which holds the unvulcanized green tire T between the mold and the bladder 3 and is heated and pressurized.

  The vulcanization mold is composed of a plurality of upper molds 1 and lower molds 2 that mold the outer shape of the green tire T. The upper mold 1 is moved up and down by driving means (not illustrated) and formed inside the mold. The substantially annular cavity S can be opened and closed. The bladder holding means is composed of a pair of upper and lower ring-shaped locking members that sandwich and lock the both ends of the bladder 3, and is disposed in the upper and lower molds together with the bladder 3 while holding the ends of the bladder 3. It is installed.

The tire vulcanizer body includes a blowout port and a discharge port for fluid flowing in the bladder 3, and is connected to a vulcanization medium supply source (not shown) through an in-machine piping system. The in-machine piping system is roughly divided into an inlet side for supplying the vulcanizing medium to the vulcanizer body and an outlet side for taking out the vulcanizing medium discharged from the vulcanizer body. In some cases, a circulation pipe for forming a forced circulation path for the vulcanization medium is provided between the entry side and the exit side.
The inlet side piping system is configured by a fluid supply pipe for a shaving process prior to the vulcanization process, a supply pipe for a pressurized fluid, and a supply pipe for a heating fluid. The outlet side piping system is composed of a mixed fluid gas discharge rod, a vacuum rod, and a drain discharge rod.

  Further, the piping system is formed with main flow paths 5a and 6a connected to the main pipes 5 and 6 of the bladder 3 and a plurality of sub flow paths connected to the plurality of branch pipes 7a, 7b, 7c, 7d and 7e. And a valve unit in which the piston valve device 100 is arranged on one side of the piping block. Gaskets serving as sealing members for preventing leakage of the flowing fluid from the connection portion are provided at the connection portion between the connection port of the piping block and the connection port of the piston valve device 100. In addition, since the internal structure of a piping block is the same as that of a conventional thing, detailed description is abbreviate | omitted.

(First embodiment of piston valve device)
A piston valve device 100 according to an embodiment of the present invention will be described with reference to FIG. In the piston valve device 100, a valve body 30 is attached to the lower end of a stem 20 connected to the piston 10, and the valve body 30 is located below the valve seat, and is a back-plug valve, that is, a normally closed type. ing.

  The piston 10 is housed in a piston casing connected to the valve body 40, and the piston casing is formed by a yoke 50 connected to the valve body 40 and a cylinder lid 60 connected to the yoke 50. Yes.

  The cylinder lid 60 has a high-pressure air inlet at the upper end, a piston sliding surface is formed on the inner peripheral surface, and the lower end is an opening that is fitted with an upper opening of a piston casing connected to the valve body 40. Part.

  The yoke 50 is connected to the valve body 40 and is inserted into the stem 20 so as to be capable of reciprocating in the axial direction, and serves as a support for housing a spring 70 that biases the piston 10 upward. As mentioned above, the opening at the lower end of the cylinder lid 60 is connected to form a piston casing.

  On the upper end side of the cylinder lid 60, a planar connection surface having a through hole as a high-pressure air inlet from the solenoid valve 300 is formed at the center, and a plurality of female screws are formed on the outer edge of the connection surface. (Not shown). The air inlet of the cylinder lid 60 and the air outlet of the electromagnetic valve 300 are screwed together by a plurality of bolts that are engaging means, and the piston valve 100 and the electromagnetic valve 300 are integrally connected.

Next, the means for connecting the piston valve 100 and the solenoid valve 300 and communicating the solenoid valve 300 and the cylinder lid 60 of the piston valve 100 through the through hole will be described in detail with reference to FIG.
The cylinder lid 60 is a cylindrical cylinder provided with a through-hole as a flow path for high-pressure air along the central axis. The cylinder lid 60 is formed on the upper end side of the cylinder with the high-pressure air discharge port of the electromagnetic valve 300. A planar connection surface is formed for joining at the above. An annular recess 210 is formed at the center of the cylinder lid 60 in a radially outward direction concentric with the high-pressure air inlet, and a seal member 250 is attached to the annular recess 210.

As the seal member 250 attached to the annular recess 210, for example, an O-ring having a circular cross section can be used. The concave shape of the annular concave portion 210 and the O-ring to be mounted may be appropriately selected according to the diameter of the air inlet of the cylinder lid 60 and the air outlet of the electromagnetic valve 300 corresponding to the capacity of the piston valve device 100. it can.
Note that the O-ring is elastically deformed in a mounted state, and the annular recess 210 has a height at which the space between the high pressure air outlet of the solenoid valve 300 and the outer surface of the high pressure air inlet of the cylinder lid 60 is sufficiently sealed. It arrange | positions so that it may protrude toward the outer side. As a material for the O-ring, nitrile rubber, fluorine rubber, ethylene propylene rubber, silicon rubber, hydrogenated nitrile rubber, acrylic rubber, or the like can be used.

  In this embodiment, an electromagnetic valve 300 is provided as means for switching and controlling the compressed air. Although there is no restriction | limiting in particular as the solenoid valve 300, A 3 port direct acting solenoid valve can be used. The solenoid valve 300 is provided with a plurality of bolt through holes (not shown) that are screwed with a plurality of female screws provided on the outer surface of the cylinder lid 60, and the solenoid valve 300 and the cylinder lid 60 are fixed to each other via the bolts. Is done. An O-ring is attached as a seal member to an annular recess 210 formed radially outwardly concentrically with the high-pressure air inlet of the cylinder lid 60, and the cylinder lid and the solenoid valve 300 are elastically deformed by the amount of protrusion. And the joint part is sealed.

(Second Embodiment of Piston Valve Device)
Next, a piston valve device 100 according to a second embodiment is shown in FIG. In addition, the same code | symbol is attached | subjected to the component same as the piston valve apparatus which concerns on 1st Embodiment mentioned above, and the detailed description is abbreviate | omitted.

  In the piston valve device 100 according to the second embodiment, the first high-pressure air inlet for reciprocating the piston 10 is disposed not on the upper end side of the cylinder lid 60 but on the cylinder side surface. This is different from the piston valve device 100 according to the embodiment. The cylinder lid 60 includes an air inflow port on the side surface of the cylinder, a piston sliding surface is formed on the inner peripheral surface, and the lower end is an opening that is fitted with an upper opening of a piston casing connected to the valve body 40. The structure of the piston casing or the like is the same as that of the first embodiment.

  A connecting portion that connects the air inlet of the cylinder lid 60 and the air discharge port of the solenoid valve 300 is formed with a planar connection surface for joining the air discharge portion of the solenoid valve 300 face to face. An annular recess 210 is formed on the connecting surface of the cylinder lid 60 in a radially outward direction concentric with the high-pressure air inlet, and a seal member 250 is attached to the annular recess 210, which is the same as in the first embodiment. Connected to

  In the piston valve device 100 according to the second embodiment, since the electromagnetic valve 300 that switches and controls the compressed air is disposed on the side surface of the cylinder lid 60, the overall height of the piston valve device is reduced. When the valve unit structure is constituted by a block in which a large number of flow paths are formed and a plurality of piston valve devices connected to the block, the valve unit is suitable for downsizing.

(Other embodiments of the piston valve device)
In the piston valve device 100 according to the first embodiment and the second embodiment, an annular recess 210 to which the seal member 250 is attached is formed concentrically with the air inlet of the cylinder lid 60. The solenoid valve 300 is fixed through a plurality of bolts to seal the connecting portion. The description will be given below between the cylinder lid 60 and the solenoid valve 300 in the conventional piston valve device shown in FIG. By disposing the connecting member 200, the piston valve device 100 including the electromagnetic valve 300 that switches and controls the compressed air on the outer surface of the cylinder lid 60 using a conventional piston valve can be obtained ( (See FIG. 5).

FIG. 6A specifically shows the configuration of the connecting member 200, and FIG. 6B specifically shows a state in which the connecting member 200 is used to connect the cylinder lid 60 and the electromagnetic valve 300 that controls switching of compressed air.
The connecting member 200 is a cylindrical tube body having a through hole as a flow path along the central axis, and tapered male threads are formed on the upper end side and the lower end side of the tube body. The taper male screw is appropriately selected so as to be screwed with the taper female screw formed on the cylinder lid 60 and the solenoid valve 300 provided in series. Further, a flange portion 220 having an annular recess 210 formed on the cylinder lid 60 side and the solenoid valve 300 side is formed in the center portion of the cylindrical body in the radially outward direction. Is installed. Further, the outer peripheral end surface of the flange portion 220 can be formed in, for example, a hexagonal shape for rotating the connecting member 200 with a spanner or the like when screwing the connecting member 200 into the tapered female screw of the cylinder lid 60.
As the seal member 250 attached to the annular recess 210, the same O-ring as in the first embodiment and the second embodiment can be used, and the connection surface on the cylinder lid 60 side and the solenoid valve 300 side can be used. A reliable and sufficient sealing effect can be obtained.

By arranging such a connecting member 200, as shown in FIG. 8, the piston valve and the electromagnetic valve 300 are connected by a long copper pipe 400, and high-pressure air is caused to flow in the copper pipe 400, thereby the piston valve. Even in a piping structure in which the piston 10 of the apparatus is moved up and down to control the switching of the flow path, the long copper pipe 400 is not required and the existing piston valve is used to directly arrange the pipe 10. The electromagnetic valve 300 can be driven.
In the above embodiment, the normally closed piston valve device has been described. However, as shown in FIG. 7, a normally open piston valve device 100 may be used. The normally closed type and the normally open type are energy economies required to supply and hold high-pressure air required for fluid control in the tire vulcanization process when a failure occurs in the piston valve device. Appropriately selected according to sex requirements.

(Operation of tire vulcanizer)
When vulcanizing the raw tire T with a tire vulcanizer, first, the upper mold 1 is raised, the raw tire T is inserted into the cavity of the vulcanization mold, and the upper mold 1 is lowered to close the cavity. Then, the bladder 3 is placed in the raw tire T while the raw tire T is housed in the vulcanization mold. Thereafter, a gas for shaving at a predetermined pressure heated to a predetermined temperature by a heating means is supplied from the main pipe into the bladder 3, and the bladder 3 is expanded in a toroidal shape so as to adhere to the inner surface of the raw tire T. The raw tire T is inflated and shaved. Subsequently, the supply of the shaving gas is stopped, a high-temperature and high-pressure heating medium is supplied into the bladder 3 from the main pipe, and heat shaping is performed while pressing the raw tire T against the inner surface of the vulcanization mold.

  The raw tire T in the tire vulcanizer undergoes a crosslinking reaction by the heat and pressure described above, the members constituting the raw tire T are bonded to each other, and the shape and the tread surface portion of the vulcanization mold are formed. The tread pattern is transferred, and desired performances are imparted to the tire as a product. Thereafter, the vulcanization medium in the bladder 3 is exhausted, the bladder 3 is separated from the inner surface of the tire after vulcanization molding, and the tire is taken out from the vulcanization mold to complete a tire as a product.

(Operation of piston valve device)
The vulcanization process of the green tire T is realized by going through a series of continuous processes of a shaving process, a heating medium supply process, a pressurized medium supply process, a cooling process, a discharge process, and a vacuum process. As a medium used in each process, for example, in the shaving process, nitrogen gas and steam are supplied through the fluid supply main pipe 5, and in the heating medium supply process, steam and heating gas are supplied through the fluid supply main pipe 5, In the pressurizing step, a low temperature gas such as nitrogen gas is supplied through the fluid supply main pipe 5. In the cooling process, cooling water is supplied through the fluid supply main pipe 5, and in the discharge process, the mixed gas is discharged through the fluid discharge main pipe 6, recovered, and reused as a shaving gas. Such a plurality of media used in each process is switched, supplied, stopped, and discharged by a plurality of piston valve devices arranged in each branch piping system.

  For example, in the shaving process, the electromagnetic valve is operated by a signal input from a control board (not shown) provided in the control panel of the tire vulcanizer to the electromagnetic valve 300 of the piston valve device 100 disposed in the supply pipe. When 300 solenoids are sucked, high-pressure air is supplied from the air inlet of the cylinder lid 60 through the port. With this high-pressure air, the piston 10 is pressed and lowered against the spring 70, and the flow path is switched by the valve body 30 at the tip of the stem 20 connected to the piston 10. For example, when the flow path switching operation by the valve body 30 connects the flow paths through which the selected medium flows, the nitrogen gas for shaving passes from the outlet to the bladder 3 through the fluid supply main pipe 5. Supplied.

  When the shaving ends, the port of the solenoid valve 300 is switched by the control signal input to the solenoid valve 300, and the high-pressure air supplied to the cylinder portion of the piston valve device 100 passes through the high-pressure air inlet of the cylinder lid 60. It is discharged through the exhaust port of the electromagnetic valve 300, the piston 10 is raised by the repulsive force of the spring 70, and the valve body 30 switches the flow path.

  The piston valve device 100 disposed in each piping system also has an electromagnetic function in a series of continuous processes such as a heating medium supply process, a pressurized medium supply process, a cooling process, a discharge process, and a vacuum process after the shaving process ends. The valve 300 operates in the same manner as the shaving process according to supply, stop, and exhaust of high-pressure air.

(Action / Effect)
As a comparative example, FIG. 8 shows a piping system between a piston valve and a solenoid valve 300 in a conventional piston valve device. In the conventional piston valve device, the high pressure air inlet of the cylinder lid 60 and the electromagnetic valve 300 for controlling the flow of high pressure air are connected by a long copper pipe 400 of 5 to 10 m. The high pressure air is caused to flow in the copper pipe 400 where the outlet and the high pressure air inlet of the cylinder lid 60 are connected, and the piston of the piston valve device is moved up and down to perform flow path switching control.

  According to the piston valve device 100 and the driving method of the piston valve device of the present invention, the end surface of the opening of the yoke 50 connected to the valve body 40 and the cylinder lid 60 in which the inner peripheral surface is formed on the piston sliding surface. A stem 30 having a piston casing connected to the end face of the opening, supported by the piston 10 fitted to the piston sliding face so as to be able to reciprocate in the axial direction in the yoke 50 and having a valve body 30 at the tip. And a solenoid valve 300 as a compressed air switching control means for controlling the supply, stop, and discharge of high-pressure air on the outer surface of the cylinder lid 60. Unlike conventional piston valves, a long air pipe is provided. It is not necessary and there is no cost for construction and maintenance of copper piping.

Even when the tire vulcanizer has a valve unit structure comprising a block having a large number of flow paths and a plurality of piston valve devices connected to the block, a solenoid valve for control is provided. Long piping for high-pressure air from the cylinder to the cylinder lid is not required, and there is no cost for construction and maintenance of copper piping.
In the piping structure of the valve unit structure, a large number of piston valve devices are gathered and arranged on the block side connection surface of a block in which a large number of flow paths are formed, and maintenance, replacement, etc. of some of the piston valve devices therein Also in this work, the work of removing and installing the copper pipe is not required, and the maintenance cost can be greatly reduced.

Furthermore, since a long high-pressure air pipe is not required, air loss is greatly reduced, and it is possible to meet the energy saving demand of the tire vulcanizer. Moreover, although the compressible high-pressure air is used for driving the piston 10, since the long copper pipe 400 from the solenoid valve 300 to the cylinder lid 60 is not required, the control response speed of the piston valve device 100 is greatly increased. Can be improved.

As the control response speed of the piston valve, the starting start time, that is, high pressure air is supplied from the air inlet of the cylinder lid 60 through the port of the electromagnetic valve 300, and the high pressure air causes the piston 10 to press down against the spring 70. The time until the start is that the length of the copper pipe 400 from the solenoid valve 300 to the cylinder lid 60 of the piston valve device having a piston with a piston diameter of 90 mm is 10 m, the inner diameter of the copper pipe 400 is 6 mm, and the pilot pressure is 0.35 MPa. In the conventional piston valve as a comparative example using high-pressure air of 1.35 sec, the piston valve device 100 of the embodiment according to the present invention has a pilot pressure of 0.35 MPa. The time until start-up when using high-pressure air was 0.6 sec.
Further, the return time of the piston valve, that is, the time until the piston 10 starts to move upward by the repulsive force of the spring 70 after the high-pressure air in the cylinder lid 60 is exhausted through the port of the electromagnetic valve 300 is the conventional time. In the piston valve, it was 2.7 sec, whereas in the piston valve device 100 of the example according to the present invention, the time until the start of return was 1.2 sec.

The switching speed of the valve body 30 in the valve body 40 is 0 for a conventional piston valve using high-pressure air having a pipe length of 10 m, an inner diameter of the copper pipe 400 of 6 mm, and a pilot pressure of 0.35 MPa. Although it was 0.7 sec, in the piston valve device 100 of the example according to the present invention, it was 0.4 sec. When the piston valve device 100 is used as a three-way valve, the flow of two different gases and liquids is controlled by the switching operation of the valve body 30. For example, the piston valve device 100 is heated to a predetermined temperature in the bladder 3 by heating means. After supplying the nitrogen gas for shaving at a predetermined pressure from the main pipe and expanding the bladder 3 in a toroidal shape, the supply of the shaving gas is subsequently stopped and high-temperature and high-pressure heated steam is supplied into the bladder 3 However, the piston valve device 100 of the embodiment according to the present invention has a short valve body switching time and can prevent the two types of fluids from being mixed. .
In order to improve the response speed with the piston valve device 100 in the comparative example, it is necessary to shorten the pipe length of the copper pipe 400 between the solenoid valve 300 and the cylinder lid 60 or to increase the pilot pressure of the high-pressure air. There are restrictions on shortening the pipe length in terms of piping, and if the pilot pressure is increased, the overall air loss increases and it is difficult to meet the demand for energy saving. In the present embodiment, since the electromagnetic valve 300 is directly disposed on the cylinder lid 60 via the seal member 250, a high response speed can always be obtained regardless of the pipe length.

Further, in the piston valve device 100 of the present invention, an annular recess 210 is formed on the cylinder lid 60 side between the air inlet of the cylinder lid 60 and the air outlet of the electromagnetic valve 300, and is attached to the annular recess 210. Since the sealing member 250 is provided, a reliable and sufficient sealing effect can be obtained at the connection surfaces on the cylinder lid 60 side and the solenoid valve 300 side.
In addition, due to such a sealing effect, a sealing tape is required for screwing between the female screw at the air inlet of the cylinder lid 60 and the male screw of the air pipe and the female screw of the air discharge port of the solenoid valve 300 and the male screw of the air pipe, which are conventionally required. Alternatively, the sealing material is not necessary, and the cost of the sealing work can be reduced, and there is no possibility that the seal tape or a fragment of the sealing material is mixed into the flow path to hinder the operation of the piston.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said Example, A various change is performed within the range of the summary of this invention described in the claim. It is possible.

1 Upper mold 2 Lower mold 3 Bladder 5 Fluid supply main pipe 5a Main flow path 6 Fluid discharge main pipe 6a Main flow path 7a Steam supply pipe 7b Gas supply pipe 7c Shaving gas supply pipe 7d Mixed gas recovery pipe 7e Vacuum pipe 10 Piston 20 Stem 30 Valve body 40 Valve body 50 Yoke 60 Cylinder lid 70 Spring 100 Piston valve device 200 Connecting member 210 Annular recess 220 Hut 250 Seal member 300 Electromagnetic valve 400 Copper pipe S Annular space T Raw tire

Claims (3)

An opening end face of the yoke connected to the valve body,
A piston casing having an inner peripheral surface coupled to an opening end surface of a cylinder lid formed on a piston sliding surface;
A stem fitted with the piston sliding surface is supported so as to be capable of reciprocating in the axial direction in the yoke, and a stem having a valve body at the tip thereof is connected,
A piston valve device in which a valve element is operated by reciprocating a stem by the piston driven using compressed air,
Provided on one outer surface of the cylinder lid with a solenoid valve for switching and controlling the compressed air,
A piston valve device characterized by that. A seal member is provided between the outer surface of the cylinder lid and the outer surface of the solenoid valve.
The piston valve device according to claim 1. An opening end face of the yoke connected to the valve body,
A piston casing having an inner peripheral surface coupled to an opening end surface of a cylinder lid formed on a piston sliding surface;
A stem fitted with the piston sliding surface is supported so as to be capable of reciprocating in the axial direction in the yoke, and a stem having a valve body at the tip thereof is connected,
In the piston valve device in which the valve body is operated by the reciprocating motion of the stem by the piston driven using compressed air,
An electromagnetic valve for switching and controlling the compressed air is disposed on the outer surface of the cylinder lid via a seal member,
Using the electromagnetic valve, the switching operation of the flow path is performed by a valve body that reciprocates by controlling the switching of the compressed air.
A drive method for a piston valve device.

Images