JPH1164052A - Mixing ratio detector for two-liquid mixing and pumping line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing ratio detector which can prevent the occurrence of an improper painting work by accurately detecting the properness/improperness of the mixing ratio of mixed paint, etc., prepared by mixing two liquids A and B together, when the device is attached to a two-liquid mixing and pumping line which is provided to supply the mixed paint, etc., for painting work, etc., performed at a building or a constructing site. SOLUTION: A mixing ratio detecting device 10 which is installed to a double-liquid mixing and a pumping line 1 immediately before a mixing and sending gun 9 at the terminal of the line 1 is provided with a mixing ratio detecting mechanism 18, which is composed of a single cylinder 11 that incorporates a piston 12 and thrusts out piston rods 13A and 13B leftwards and rightwards and has a liquid A pool path section 14 and a liquid B pool path section 15 on both sides of the piston 12, respectively. Piston rod-side detectors 16 at the front ends of the piston rods 13A and 13B, and detecting sections 17 which are fixed to the operating zones of the detectors 16 and have normal zones A, abnormal approaching zones B, and abnormal points C. The piston 12 keeps a neutral balanced attitude, when the liquids A and B are maintained at a prescribed pressure ratio, but, when the pressure ratio becomes abnormal, moves to actuate the detecting mechanism 18 so as to issue an alarm and stop the line 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, urethane
A two-component mixed paint in which a curing agent such as a polyol or amine is mixed at a predetermined ratio with a resinous base such as an epoxy resin is continuously supplied to perform painting on buildings, etc., or a foaming agent is used as a resinous base. Mixing and sending at a specified ratio, attached to a two-component mixing delivery line, such as applying a waterproof coating on concrete floors, etc., and used to detect the good / bad mixing ratio of the two components to be delivered and supplied The present invention relates to a mixing ratio detecting device for a two-liquid mixing and sending line.

[0002]

2. Description of the Related Art Conventionally, the delivery of paint and the delivery of a two-part mixed waterproofing agent and the like by the two-part mixing and delivery line are performed at a building / construction site.
The liquids are separately and continuously supplied from the liquid A tank and the liquid B tank, which contain the liquids, by a line-structured device which aspirates and discharges each liquid by a separate discharge pump, and mixes and discharges them at a predetermined ratio by a mixing section of a line terminal. You. A heating device for stabilizing the viscosities of the A liquid and the B liquid, which determines the mixing ratio of the two liquids, is provided in the line as necessary, so that the mixing ratio is stabilized.

[0003]

However, in the construction and construction sites using the two-liquid mixing delivery line, the distance from the delivery pump to the mixing section may be as long as about 100 meters. Since the long and large path is connected by a hose and supplied and supplied, and the construction environment is a natural cold and warm environment, the pumping amount of the liquid A and liquid B is adjusted and set to a predetermined ratio in advance, and the heating device is disposed. However, the mixing ratio may change due to a change in the bending form of the long hose (the arrangement of the hose may be suddenly changed due to other construction reasons), a change in the resistance in the hose, or a change in viscosity due to a change in the outside temperature. Cases that collapse and result in poor mixing occur quite frequently. And since a simple device for detecting such a mixing ratio defect has not been developed, it is inevitable to determine afterwards whether the mixing ratio is good or defective due to the work such as painting with the mixed liquid sent from the line end. In addition, there is a problem in that a firing failure, a curing failure, or the like due to a poor mixing ratio occurs, and a great deal of labor and time are consumed for repairing the failure, and wasteful consumption of resources is caused.

On the other hand, in order to solve the above-mentioned difficulties, the actual delivery amounts of the solution A and solution B immediately before being fed into the mixing section are continuously measured and input to a computer, and feedback information by computer operation is fed to a delivery pump. The mixing ratio automatic control device that continuously transmits the output correction control for maintaining the predetermined mixing ratio by transmitting the control signal to the mixing ratio is naturally possible as a modern technology, but the electronic control by the electronic control becomes expensive. This is unavoidable, and is sometimes more expensive than the line body of the two-liquid mixing / delivery line, resulting in a significantly higher construction cost, and thus lacks practicality as a construction site device. In view of the above circumstances, there is a need in the art for the development of an inexpensive mixture ratio detection device having a simple structure.

The present invention solves the above-mentioned disadvantages of the prior art, and also provides a mixing ratio detecting device for a two-liquid mixing / delivery line which meets the demands of the technical field.

[0006]

To achieve the above object, a mixing ratio detecting apparatus according to the present invention comprises a "two-component mixing pump having a delivery pump for individually pumping A and B solutions and a mixing section for the A and B solutions. A mixing ratio detecting device to be mounted on the delivery line, comprising a cylinder body having a reciprocally operable piston provided therein and projecting a piston rod, and defining a cylinder inner chamber defined by the piston as a liquid A pool pass portion and a liquid B pool pass portion. And arranged in front of the mixing section on the delivery side of the delivery pump, so that the A liquid and the B liquid of the A liquid pool pass section and the B liquid pool pass section balance the piston under a predetermined pressure difference. A structure for maintaining the posture and detecting the good / bad mixing ratio of the liquid A and liquid B by detecting the displacement of the piston.

That is, the mixing ratio detecting device of the present invention detects the pressure difference state of the substitution characteristic of the mixing ratio of the liquid A and the liquid B in the mixing unit before the mixture is fed into the mixing unit, thereby detecting the mixing ratio in the mixing unit. It is characterized by a structure that makes it possible to detect the good / bad state of the two-liquid mixture ratio. The means for maintaining the piston in a neutral balance state under the predetermined pressure difference between the liquid A and liquid B is the effective pressure on both sides of the piston. Means for applying an urging force by an area ratio or an urging spring mounted on the piston is adopted.

[0008]

The mixing ratio detecting device according to the present invention having the above-described structure is provided with the following:
If the pressure difference between the liquid and the liquid B is in a normal state within a preset allowable range, the piston / piston rod maintains a stationary or fine operation state, so that the normality of the two-liquid mixing ratio can be accurately confirmed. If an alarm / stop switch is set on the piston rod, an alarm is activated when the fluid pressures of the liquid A and liquid B approach the limit of the permissible range due to any cause, and it is possible to detect an abnormal approach in advance. In addition, if it becomes an abnormal pressure difference state that brings about construction failure such as foaming failure and curing failure due to the mixture, by operating the stop switch set on the piston rod,
Emergency stop of the line operation can prevent the occurrence of defective construction. And since the main body of the device is a single piston / cylinder configuration, the structure can be simplified and the cost can be set low, so that the construction cost does not increase.

[0009]

Embodiments of the present invention will be described below. First, with reference to FIG. 1 showing the first embodiment of the present invention, the one shown in FIG. This is a mixing ratio detection device 10 to be mounted on a two-liquid mixing delivery line 1 that continuously supplies a coating part.

That is, the two-component mixing delivery line 1 is composed of a two-component urethane paint comprising isocyanate as a main component and a polyol as a curing agent, or bisphenol A (a resin having an epoxy side) as a main component and an amine as a curing agent. A two-component mixed epoxy resin paint (hereafter, the main agent is agent A and the hardener is agent B)
An A agent delivery section 4 including a tank 2A for the agent and a delivery pump 3A for sucking and delivering the A agent from the tank 2A, and a B agent delivery section 5 also including a tank 2B and a delivery pump 3B are provided side by side. The agent / B agent delivery sections 4 and 5 are connected to a mixing ratio detection device 10 (hereinafter simply referred to as a detection device 10) by a delivery hose 6 having a length of about 100 meters, and further mixed and delivered to a liquid discharge side of the detection device 10. The line configuration is provided with a gun 9.

More specifically, the detecting device 10 comprises a slightly longer cylinder 11 having a single piston 12 therein, and the piston 12 comprises two piston rods 13A and 13B protruding to both sides of the cylinder 11. As a result, it can slide freely within the cylinder 11. One of the cylinder inner chambers defined by the piston 12 is configured as an A agent pool pass portion 14 and the other is configured as a B agent pool pass portion 15. Each of the A agent and B agent pool pass portions 14 and 15 is connected to the delivery hose 6. It has a liquid inlet port 7 for connecting and injecting the agent A / B, and a liquid outlet port 8 connected to the mixing / dispensing gun 9 for sending the agent A / B, and was pumped by the delivery pumps 3A and 3B. The agent A and agent B are sequentially sent to the agent agent pool pass section 14 and the agent B pool pass section 15 and temporarily pooled, and then individually sent out from the liquid outlet port 8 to reach the mixing and delivery gun 9. I have.

Further, the detecting device 10 includes a micro-switch detector 16 attached to the distal ends of the piston rods 13A and 13B protruding to both sides, and a detecting unit 17 fixed to an operating range of the detector 16. A mixing ratio detecting mechanism 18 for the agent B is provided. The detecting unit 17 includes a normal zone A and an abnormal approaching zone B in which the mixing ratio of the agent A and the agent B is in a normal range.
When the detector 16 is in the normal zone A, the blue lamp with the normal mixture ratio is turned on, and when the detector 16 reaches the abnormal approach zone B, a red lamp and a buzzer alarm are generated. It is a detection process in which the delivery pumps 3A and 3B are stopped when the abnormal point C is reached and the line is urgently stopped.

The liquids A and B of the embodiment shown in FIG. 1 are supplied to the mixing / delivery gun 9 because of the uniform mixing ratio.
As for the liquid, the equal pressure is required, and the liquid A
The pressure difference of the liquid B is based on zero. Therefore, the piston rods 13A and 13B have the same diameter and the same effective pressure receiving area on both sides of the piston 12. Since the two-liquid mixing / dispensing line 1 is used for mixing / dispensing various kinds of liquids A and B, the cleaning agent is supplied to clean the inside of the line including the detecting device 10 to prevent trouble due to liquid change. The cleaning unit 21 is provided at a necessary place.

When the pressure difference between the liquids A and B is zero in the reference state, the detecting device 10 keeps the piston 12 at rest or in a neutral balance position with a slight displacement due to pump pulsation or the like. Exists in the normal zone A, and the normality of the mixture ratio is detected and displayed. If a pressure difference occurs between the agent A and the agent B for any reason, the piston 12 slides and displaces to the low pressure side, the detector 16 reaches the abnormal approach zone B, and an alarm is activated to notify the abnormal approach. Correction of the cause of abnormalities such as correction of the hose bending form and adjustment of the pump pressure is possible. If the abnormal approach cannot be eliminated immediately due to a serious cause such as a shortage of the A agent and the B agent in the tanks 2A and 2B, the detector 16 reaches the abnormal point C and stops the line 1 urgently. Poor painting work such as poor curing based on defects can be prevented.

Next, another embodiment of the present invention will be described with reference to FIGS. That is, the inner chamber of the cylinder 11 is partitioned by the piston 12 into the A agent pool pass portion 14 and the B agent pool pass portion 15, and the piston rod 13 is provided with a mixing ratio detecting mechanism 18 at the tip thereof. And the effective pressure receiving area on both sides of the piston 12 is set to an area ratio matching the pressure ratio of the agent A and agent B. When the liquid A and the liquid B have a predetermined pressure difference, the piston 12 assumes a neutral balance posture. It is designed to hold. The embodiment of FIG. 2 is used in a case where the pressure ratio of the agent A and the agent B is not equal. As a modification of the embodiment shown in FIG. 2, the piston rod 13 may be a pair of left and right having different rod diameters, and the area ratio of the effective pressure receiving area of the piston 12 may be adjusted to a predetermined pressure ratio depending on the difference in the rod diameter.

On the other hand, the one shown in FIG. 3 has a pair of piston rods 13A and 13B having the same rod diameter.
It has a structure in which an urging spring 20 capable of adjusting the urging force by setting a spring L by an adjusting nut 19 is fitted to either or one of the piston rods 13A and 13B. By applying a force to the piston 12, the piston 12 maintains the neutral balance posture even under the conditions of the liquid A and the liquid B having a pressure difference, and the detector 1
6 has a structure existing in the normal zone A. In FIG. 3, the pressure ratio of the agent A and the agent B is not limited and can be varied and set within a wide range. Therefore, the mixing ratio of the agent A and the agent B can be changed in the middle of the construction, or the mixing ratio can be varied. It can be usefully used for liquid mixing. When a pressure difference is applied to the A agent / B agent and mixing is performed, for example, Japanese Patent Application No. Hei 7-3
Mixing and delivery is performed by a mixing and delivering gun 9 having a two-part mixing and dispensing structure disclosed in Japanese Patent No. 49654.

The detecting device 10 of the present invention is not limited to the above-described embodiment, and the mixing ratio detecting mechanism 18 may have only the line stop function at the abnormal point C only, or may be the detector 16 of the proximity switch mechanism. is there.

[0018]

As described above, the mixing ratio detecting device for a two-liquid mixing delivery line according to the present invention provides a warning when the mixing ratio of the two-liquid mixing approaches a defective limit and a line stop when the defective limit is reached. It is possible to maintain the normal functioning of the line function by removing the cause of the abnormal approach, and to prevent the occurrence of defective works due to the liquid with a poor mixing ratio, and to repair the defective works. By eliminating labor and time, it is possible to reduce the construction cost and prevent the construction period from being lengthened.

In addition to preventing wasteful use of resources due to defective construction, the above-mentioned effects can be enjoyed without increasing the cost of construction due to the structural features that can be simplified and provided at a low cost. I can respond. There are various effects that are excellent in practicality as described above.

[Brief description of the drawings]

FIG. 1 shows a mixing ratio detecting device for a two-liquid mixing / delivery line according to an embodiment of the present invention. FIG. 1 (A) is a diagram of a two-liquid mixing / delivery line equipped with the mixing ratio detecting device, and FIG. Central sectional front view of ratio detection device

FIG. 2 is a front view in center section of a mixing ratio detecting device for a two-liquid mixing and sending line according to another embodiment of the present invention.

FIG. 3 is a front view in center section of a mixing ratio detecting device for a two-liquid mixing and sending line according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Two-liquid mixing and sending line 2A A agent tank 2B B agent tank 3A / 3B sending pump 4 A agent sending line 5 B agent sending line 6 Sending hose 7 Inlet port 8 Outlet port 9 Mixing and sending gun 10 Mixing ratio detecting device 12 Piston 13A / 13B Piston rod 14 A agent pool pass section 15 B agent pool pass section 16 Detector 17 Detector 18 Mixing ratio detecting mechanism 19 Adjustment nut 20 Bias spring A Normal zone B Abnormal approach zone C Abnormal point

Claims (2)

[Claims] 1. A reciprocatingly operable piston is provided as a delivery pump for individually pumping A liquid / B liquid and a mixing ratio detecting device attached to a two-liquid mixing / delivery line having a mixing section for the A liquid / B liquid. And a cylinder body protruding a piston rod. The cylinder inner chamber defined by the piston is constituted by a liquid A pool pass section and a liquid B pool pass section, and is disposed in front of the mixing section on the delivery side of the delivery pump. The liquid A and liquid B of the liquid A pool pass portion and the liquid B pool pass portion hold the piston in a neutral balance posture under a predetermined pressure difference, and the displacement of the liquid A and liquid B by the displacement of the piston. A mixing ratio detecting device for a two-liquid mixing and sending line, characterized by a structure for detecting a good / bad mixing ratio. 2. The area ratio of the effective pressure receiving area on both sides of the piston,
2. A two-liquid mixing / delivery line according to claim 1, further comprising a neutral balance means for holding the piston in a neutral balance posture under a predetermined pressure difference between the liquids A and B by the urging force of a urging spring mounted on the piston rod. Mixing ratio detector.