JP2000025890A - Valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate disassembling and cleaning operation at the time of changing of a type of an object to be carried by including a pair of interposing members which are placed on both sides of a flexible tube for allowing an object to be carried to pass through while at least one of the members is capable of reciprocatingly moving. SOLUTION: A pair of right and left interposing members 2, 2 press a flexible tube 1 so that right and left cylinders 3, 3 respectively move piston rods 3a, 3a to a direction where they come closer to each other and rollers 4, 4 at the tip match at the center of the flexible tube 1. Both wall faces of the flexible tube 1 come into contact and close a valve. In addition when the pair of right and left interposing members 2, 2 respectively drive the right and left cylinders 3, 3 to move the piston rods 3a, 3a to a direction where they come farther from each other, the rollers 4, 4 at the tip come farther from the flexible tube 1, thereby opening the valve. The valve structure 10 has only the flexible tube 1, among components, that comes into direct contact with a powder and granular substance. Therefore, the interposing members 2, 2 placed outside never come into contact with the powder and granular substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve structure, and more particularly, to a valve structure for facilitating disassembly and cleaning operations when changing types of transferred objects.

[0002]

2. Description of the Related Art For example, a discharge pipe of a storage tank for storing powders such as synthetic resin chips is provided at the bottom, and a valve is provided as a means for blocking the flow of powders being discharged from the discharge pipe. I have. Typical valves used in this manner include, for example, a slide valve, a cut gate / damper valve, and the like. Each of them is composed of a valve and a valve seat. The valve is closed to the valve seat side to block the flow of the granular material, and is opened from the valve seat to discharge the granular material.

On the other hand, in the production of synthetic resins, small-quantity, multi-product production has become mainstream, reflecting the diversification of customer needs.
For this reason, it is important from the viewpoint of production efficiency that it is possible to easily and quickly execute the type change of the production equipment. From this point of view, the storage tank for the granular material is also used for storing a plurality of varieties, and the tank needs to be cleaned so as not to mix the varieties every time the varieties are switched, and the valve needs to be disassembled and cleaned.

That is, in the case of conventional valves such as a slide valve and a cut gate / damper valve, since the granular material may bite into the valve or be moored in a corner portion due to its structural complexity, the type is changed. Disassembly and cleaning were necessary to completely remove the previous granules. However, these valves have a problem that each component is made of metal and is heavy, and its structure is complicated, so that disassembling operation and cleaning operation are difficult and skill is required.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a valve structure which simplifies and reduces the weight of a structure, thereby facilitating disassembly and cleaning operations when changing the type of a transferred object.

[0006]

According to the present invention, there is provided a valve structure for achieving the above object, comprising: a flexible tube through which a transfer object passes;
And a pair of pressing members which are arranged on both outer sides of the flexible tube and at least one of which is reciprocally movable. As described above, since only the simple cylindrical flexible tube is in direct contact with the transferred object in the valve structure parts, when changing the type of the transferred object, only the flexible tube is removed and replaced. Or just wash it. Further, since the flexible tube is made of a lightweight flexible material, disassembly and cleaning operations can be facilitated.

[0007]

1 (A) and 1 (B) and FIG.
FIGS. 1A and 1B show a valve structure for blocking transfer of a synthetic resin chip according to an embodiment of the present invention. FIG. 1 shows a valve closed state, and FIG. 2 shows a valve opened state. Figures 1 and 2
In the storage tank 20 for the powder (synthetic resin chips)
Is provided with a discharge pipe 21 at the bottom, and the valve structure 10 of the present invention is attached to the discharge pipe 21.

In the valve structure 10, a cylindrical flexible tube 1 is detachably attached to a discharge tube 21 via a tightening ring 5 or the like. It is constituted by arranging the clamping members 2 and 2.
Each of the left and right pressing members 2 and 2 has a cylinder 3 fixed at a fixed position as a driving unit, and a roller 4 is attached as a pressing means to a tip end of a piston rod 3a reciprocally driven by the cylinder 3. I have.

The pair of left and right pressing members 2, 2 are shown in FIG.
As shown in (A) and (B), the left and right cylinders 3 and 3 move the piston rods 3a and 3a in a direction of approaching each other, and the leading rollers 4 and 4 coincide with each other at the center of the flexible tube 1. When the flexible tube 1 is pressed in such a manner as to perform the operation, the two wall surfaces of the flexible tube 1 come into contact with each other and the valve is closed. Further, as shown in FIGS. 2A and 2B, a pair of left and right pressure members 2, 2 drive left and right cylinders 3, 3, respectively, to move piston rods 3a, 3a.
When a is moved in a direction away from each other, the rollers 4, 4 at the distal end are separated from the flexible tube 1 and are opened.

In the valve structure 10 of the present invention, as described above, the component that comes into direct contact with the granular material is the flexible tube 1.
However, the pinching member 2 disposed outside does not come into contact with the granular material at all. Therefore, when changing the type of the granular material in the storage tank 20, the flexible tube 1 is connected to the discharge tube 21.
It can be removed or attached from the device, but it can be easily performed because of its simple structure. In addition, since it is simple and inexpensive, it can be replaced with a new spare.

The cleaning operation of the detached flexible tube 1 is performed as follows.
Since it is only necessary to wash a simple cylindrical tube, it is possible to easily perform complete washing without any residual particulates. In addition, since the flexible tube 1 is made of a light-weight flexible material such as a fiber cloth, it is possible to easily perform the detaching, mounting, and cleaning operations without heavy labor. In the present invention, the constituent material of the flexible tube is not particularly limited as long as it is a flexible material having necessary strength. Examples include fiber fabrics made of synthetic fibers such as nylon fibers and polyester fibers, soft synthetic resins such as silicone, polyethylene, and vinyl chloride, and rubbers such as synthetic rubber and natural rubber.

The flexible tube made of synthetic resin or rubber may be formed into a tubular shape from a sheet of such a material, or may be formed from an extruded tube. In addition, reinforcing treatment may be performed by blending reinforcing fibers with these materials. The fiber fabric may be a knitted fabric or a nonwoven fabric, but a taffeta woven fabric of nylon fibers is particularly preferred. The fiber cloth may be processed directly from the cloth alone, or may be coated with rubber or soft resin if necessary.

It is preferable that a pair of pressure members be provided with a roller or a rod having a circular cross section while intersecting in the axial direction of the flexible tube as means for directly pressing the flexible tube at the distal ends thereof. The direction in which the roller or rod intersects the flexible tube is particularly preferably orthogonal. Further, it is preferable that the longitudinal direction of the roller or the rod is linear,
It may be curved or bent as long as it does not interfere with the valve closing operation.

It is desirable that the length of the roller or rod provided at the distal end portion completely cross the width direction of the flexible tube when the valve is closed. That is, 1/2 of the circumference of the flexible tube
It is preferable to have a length corresponding to the above. By having such a length, the closing of the flexible tube can be performed accurately and reliably. The driving unit of the clamping member is not particularly limited as long as it acts to press the distal end portion against the flexible tube. For example, there are a cylinder and a crank mechanism, but a cylinder for driving a piston rod to reciprocate linearly is preferable, and an air cylinder is particularly preferable.

It is preferable that the driving section is provided on each of the pair of pressing members so that the distal ends on both sides meet each other at the center of the flexible tube. However, it is not always necessary to provide the driving units on both the pressing members, and a configuration may be adopted in which only one pressing member is provided and the other pressing member is fixed in a stationary state. The latter configuration is possible when the valve structure is configured such that the lower end side of the flexible tube is a free end.

In the above embodiment, the case in which the transfer object is the valve structure provided in the transfer path of the granular material made of the synthetic resin chip has been exemplified. However, the present invention relates to the transfer of the granular material other than the synthetic resin chip. It can also be used as a valve structure in a path.

[0017]

As described above, according to the valve structure of the present invention, only the flexible tube having a simple cylindrical shape comes into direct contact with the transfer object. Can be replaced or washed by removing only the flexible tube. In addition, since the flexible tube is made of a light-weight flexible material, disassembly and cleaning operations can be easily performed with a light operation.

[Brief description of the drawings]

FIG. 1A is a schematic longitudinal sectional view showing a state where a valve structure according to an embodiment of the present invention is closed, and FIG. 1B is a sectional view taken along line XX in FIG. 1A. .

2A is a schematic longitudinal sectional view showing a valve structure according to an embodiment of the present invention when the valve is opened, and FIG. 2B is a sectional view taken along the line YY in FIG. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Nipping member 3 Cylinder 3a Piston rod 4 Roller 10 Valve structure

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Minoru Noda 1-9-1, Oe-cho, Minato-ku, Nagoya-shi, Aichi F-term in Nagoya Works, Toray Corporation (reference) 3E070 AA19 AB11 HA01 HB06 HD01

Claims (5)

[Claims] 1. A valve structure comprising: a flexible tube through which an object to be transported passes; and a pair of clamping members disposed on both outer sides of the flexible tube and at least one of which is capable of reciprocating movement. 2. The valve structure according to claim 1, wherein the flexible tube is made of fiber cloth, synthetic resin or rubber. 3. The valve structure according to claim 1, wherein the pressing member extends at a tip end in a direction intersecting the flexible tube and has a roller or a rod having a circular cross section. 4. The valve structure according to claim 1, wherein said reciprocating means for moving said clamping member is a cylinder. 5. The transfer object according to claim 1, wherein the transfer object is a granular material.
5. The valve structure according to any one of 4.