JPH0215593Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a pipe lining in which a piston for extruding liquid lining material from the injection path is provided in a main body having an injection path so as to be slidable back and forth. Regarding material injectors.

[Prior art]

Conventionally, the liquid lining material was discharged from the injection path simply by extruding the piston.

[Problem that the invention attempts to solve]

However, when the piston is moved near the stroke end on the injection path side, the lining material in the gap between the lining material pressing end surface of the piston and the inner end surface of the main body is pushed out because the viscosity of the liquid lining material is quite high. In addition, the lining material remains in the injection path, so when the piston is pulled back, the vacuum effect caused by the adhesion of the residual lining material makes it difficult for the piston to move or prevents it from moving. After removal from the tube, the inlet of the tube is filled with lining material, and as the lining material object is inserted into the tube, the lining material overflows, resulting in the contamination of the tube, etc.

The purpose of this invention is to sufficiently reduce the amount of lining material remaining in the syringe to facilitate the retraction operation of the piston, and to allow the lining material to be inserted into the tube without or with very little overflow caused by insertion of the lining material. The main point is to enable the supply of lining material.

[Means to solve the problem]

The characteristic configuration of the present invention is that the lining material pressing end surface of the piston located near the stroke end on the side of the lining material injection port of the main body communicates with a portion of the gap between the inner end surface of the piston and the portion located near the periphery of the piston. This is due to the formation of a pressurized gas supply path.
Its effects are as follows.

[Operation] In other words, if the piston moves to the vicinity of the stroke end on the injection port side and further injection movement becomes difficult or impossible, for example, a pressure for piston movement is applied from the pressurized gas supply path between the piston and the main body. A suitable pressurized gas such as pressurized air is supplied, and the residual lining in the syringe can be injected into the pipe by gas pressure, and
The lining material can be pushed deep into the pipe.

Therefore, the amount of lining material remaining in the syringe can be extremely reduced, and the piston can be easily pulled back without being adversely affected by the vacuum effect caused by the adhesion of the remaining lining material.

Furthermore, when inserting a lining object into a tube from which the syringe has been removed, since the lining material is pushed inward, it is possible to avoid an inconvenient situation where the lining material overflows from the tube. Lining work can be done well without getting dirty.

[Effect of idea]

As a result, it has become possible to perform both the lining material injection work and the lining work easily, quickly and efficiently, and it has become possible to provide a pipe lining material injector that is even better in terms of both workability and handling.

〔Example〕

Next, examples will be shown.

As shown in FIG. 1, an injection channel 4 is formed at the tip of the conical bottom wall of the bottomed cylindrical body 1 to supply a liquid lining material 3 to the tube 2 to be internally lined.
A lid 5 that airtightly closes the open end of the main body 1 is detachably provided.

A piston 6 for pushing out the liquid lining material 3 from the injection path 4 is provided in the main body 1 so as to be slidable back and forth,
An air compressor 9 is connected to a supply air pipe 8 with an on-off valve 7 attached to the lid 5, so that the piston 6 can be injected and moved by the action of pressurized air, and a handle 10 connected to the piston 6 is connected. The piston 6 is configured to protrude from the lid 5 so that the piston 6 can be manually pulled back.

As shown in FIG. 2, the lining material pressing end surface 6a of the piston 6 is formed into a conical shape along the inner end surface 1a of the main body 1, and a plurality of projections 1b are formed on the inner end surface 1a.
are arranged so as to be distributed in the circumferential direction, and a narrow gap 11 is formed between the lining material pressing end surface 6a and the inner end surface 1a when the piston 6 reaches the stroke end on the side of the injection path 4. It has been done. In addition, when the piston 6 approaches the stroke end on the injection path 4 side, grooves 13 that communicate the gap 11 with the pressurized air chamber 12 behind the piston 6 are distributed in the circumferential direction on the inner peripheral wall surface of the main body 1. groove 13.
The lining material of the gap 11 and the injection path 4 is pushed out to the inside of the pipe 2 by pressurized air from the pipe.

In addition, in the drawing, 14 is packing, 15a, 15
b is an O-ring.

[Another example]

Next, another example will be shown.

The main body 1 and the piston 6 can be appropriately modified in shape, structure, etc., and for example, the protrusion 1b may be omitted. The operating configuration for reciprocating the piston 6 can be freely changed.

The configuration for supplying pressurized gas to the gap 11 is as follows:
For example, as shown in FIG. 3, an appropriate gas supply device 17 can be connected to the through hole 16 of the main body 1. It is sufficient if the pressure gas supply paths 13 and 16 are formed.

The type of liquid lining material 3 used is not necessary, and the pipe 2 to be treated may be an existing pipe such as a city gas pipe or a water pipe, or any other pipe.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention;
The figure is a sectional view of a main part of the syringe shown in FIG. 1 showing how it is used. FIG. 3 is a sectional view of main parts showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Main body, 1a... Inner end surface, 3... Lining material, 4... Injection path, 6... Piston, 6a...
Lining material pressed end surface, 11... Gap, 13, 1
6... Pressurized gas supply path.

Claims (1)

[Scope of utility model registration request] In the main body 1 having an injection channel 4, a piston 6 is provided for pushing out the liquid lining material 3 from said injection channel 4.
This is a pipe lining material injector that is provided with a lining material injector that can be slid reciprocally, and has a lining material pressing end surface 6a of the piston 6 located near the stroke end on the side of the injection path 4 and an inner end surface 1a of the main body 1. A pipe lining material injector in which pressurized gas supply passages 13 and 16 communicating with a portion of the gap 11 located near the periphery of the piston 6 are formed.