JP3493244B2 - Simple cleaning system for mold water pipeline - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an apparatus for cleaning rust, scale, mold and the like generated on the inner wall of a heat retaining water pipe or the inner wall of a cooling water pipe of molds such as plastic molding dies and hot cold presses.

[0002]

2. Prior Art and Problems As shown in FIG. 5, a cleaning liquid tank 1 '
To the liquid inlet 4'of the cooling circuit 3'of the mold 2'through the pressure pump 7 ', and the filter 6'and drain switching valve 8'from the liquid outlet of the cooling circuit. It is known that a cleaning system for a water conduit of a mold is provided in which a liquid supply pipe 4'is piped again to the cleaning liquid tank 1'through the above and the order.

In this prior art, the pressure feed pump 7'is operated to remove the cleaning liquid in the cleaning liquid tank 1'from the water pipe 3'of the mold 2 '.
The rust, scale, mold, etc., generated on the inner wall of the water pipe are removed by pressure feeding into the water pipe, and the contaminated liquid mixed with these impurities is filtered by the filter 6 ', and then discharged by the operation of the drain switching valve 8'. It is a cleaning means that pressure feeds to the caustic or cleaning liquid tank 1 '.

According to such a conventional technique, since the pressure feed pump 7'used is generally a pump that cannot be idled, after the pump is operated, the water pipe 3 ', the liquid feed pipe 4', etc. Is filled with the cleaning liquid, and the recovery of the residual cleaning liquid cannot be expected. Therefore, it is necessary to perform dangerous work such as processing the residual cleaning liquid and transferring the cleaning liquid to the cleaning liquid tank 1 ′. In addition, there is a concern that the use of the pressure feed pump may cause an accident such as disconnection of the liquid supply pipe due to the pressure feed of the cleaning liquid, a jetting and scattering of the cleaning liquid due to the disconnection of the liquid supply pipe, and a disaster such as the bathing of the cleaning liquid by the worker.

If the maintenance of the water pipe of the mold is neglected because the recovery of the residual cleaning liquid cannot be expected, the inner diameter of the water pipe will be narrowed by scales and molds.
The heat exchange, which is the original function of the water pipe, is not performed as expected,
The heat exchange efficiency decreases, the cooling is incomplete during the molding of plastics, die-casting, etc., the deformation and shrinkage rate after taking out the product become large, and the defective product production rate becomes high. Further, in the cold press and the like, if maintenance is neglected, uneven cooling is partially generated, and if the product is taken out as it is, it causes complicated warpage and the like.

The present invention was devised by focusing on the problems found in the above-mentioned water pipe cleaning system. It eliminates dangerous cleaning liquid processing work and cleaning liquid transfer work, and disconnects the liquid supply pipe. It is possible to prevent the occurrence of accidents such as accidents and spouting of cleaning liquid and the bathing of cleaning liquid by workers, and it is easy to maintain the mold water pipeline and reduce the production rate of defective products. The purpose is to propose a simple cleaning system for water pipes of various dies.

[0007]

[Technical Means for Solving Problems] The technical means taken by the present invention to achieve the above-mentioned object is to pump the cleaning liquid to the entire circuit such as the water pipeline of the mold and the piping system of the liquid delivery pipeline. That is, a suction circulation system and / or a suction discharge system by a suction pump capable of self-priming and idle operation are avoided, avoiding circulation or pressure discharge. The cleaning liquid tank and the water cleaning tank can be replaced with respect to the entire circuit such as the piping system of the liquid supply pipe. In addition, a cleaning liquid tank and a water washing tank are connected to the piping system of the liquid supply pipe via a three-way valve, so that the cleaning liquid and the water for washing can be switched and used.

[0008]

[Operation] If the suction pump is operated with the air intake valve closed to wash or neutralize the water pipe of the mold, the entire circuit, such as the water pipe and the liquid feed pipe, will have a negative pressure. Become. Since the cleaning liquid tank and the water washing tank can be replaced with respect to the piping system using the liquid supply pipe, if the air intake valve is closed and the suction pump is operated while the cleaning liquid tank is connected, The entire circuit such as the piping system by the liquid pipe is washed, and the polluted cleaning liquid is filtered and purified by the filter and collected in the cleaning liquid tank. After this cleaning is completed, while the suction pump continues to operate, the air intake valve is opened to absorb the residual cleaning liquid of the entire circuit, and the liquid is filtered with a filter.
Purify and collect in the cleaning liquid tank.

As soon as the work of sucking the residual cleaning liquid is completed, the cleaning liquid tank is replaced with a water cleaning tank, the air intake valve is closed, and the suction pump is operated. The whole is washed with water (or neutralized with a neutralization treatment liquid), and the polluted water (or the pollution treatment liquid) is filtered and purified by a filter and collected in a washing tank. When this washing (or neutralization) is completed, the air intake valve is opened while the suction pump continues to operate, and the residual polluted water (or the residual polluted treatment liquid) in the entire circuit such as the water pipeline and the piping system is absorbed. Filter with a filter, purify and collect in a washing tank. Therefore, it becomes possible to perform the cleaning liquid processing work, the cleaning liquid transfer work, and the like by operating the exchange suction pump of the cleaning liquid tank and the water washing tank, and opening / closing the air intake valve.

However, in the above-described cleaning liquid treatment work, cleaning liquid transfer work, etc., the suction pump is operated and the air intake valve is opened / closed by connecting the liquid supply pipe to the cleaning liquid tank and the water washing tank through the three-way valve. This can be done by switching the three-way valve together with the operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Claims 1 and 2 will be described with reference to FIGS. 1 is an explanatory view of claims 1 and 2, wherein a cleaning liquid tank 1 is a cleaning liquid capable of mold cleaning (for example, a commercially available Nissho pipe cleaner NA.
-P, other cleaning liquid), which is a poly container filled with a well-known hose holder 12 to which the liquid supply pipe 4 is detachably connected.

The mold 2 is a plastic molding mold, a hot cold press, and other molds, and has a well-known structure having a water pipe 3 such as a heat retaining water pipe and a cooling water pipe inside. The water pipe 3 in the mold 2 has a liquid feed pipe 4 connected to the liquid inlet 3-1 and a liquid feed pipe 4 connected to the liquid outlet 3-2 so that the cleaning liquid circulates in the water pipe 3. Configure to get.

The liquid supply pipe 4 is composed of a cleaning liquid tank 1 → a well-known manifold 13 → a water pipe line 3 of a mold 2 → the manifold 13 →
The filter 6 → the suction pump 7 → the waste liquid switching valve 8 → the cleaning liquid tank 1 is piped, and the cleaning liquid in the tank is sucked by the suction pump 7.
When the washing liquid tank 1 is replaced with the washing tank 9, the water or the neutralization treatment liquid in the tank is constructed as described above. It is configured so that the entire circuit can be circulated.

The air intake valve 5 sucks the residual cleaning liquid or the residual polluted water (or the residual pollutant treatment liquid) inside the water pipe 3 of the mold 2 and the entire circuit such as the piping system by the liquid feed pipe 4 by a suction pump 7.
A well-known valve such as a ball valve (illustrated example) or a butterfly valve, provided that it is a member that is arranged to discharge it out of the circuit in cooperation with Even if it exists, it does not matter even if it is the valve developed according to the use of the present invention.

The air intake valve 5, in cooperation with the suction pump 7, absorbs the residual cleaning liquid or the residual polluted water (or the residual pollutant treatment liquid) in the water pipeline 3 of the mold 2, and at the same time, the air is sucked into the water pipeline 3 described above. In order to replace the residual cleaning liquid or the residual polluted water (or the residual pollutant treatment liquid) with the inside of the cleaning pipe, the cleaning liquid tank 1 is attached to the manifold 13 in front of the liquid inlet 3-1 of the water pipe 3 (a portion near the cleaning liquid tank).
From the liquid pipe 4 to the water pipe 3 so as to communicate therewith.
The air intake valve 5 should be used when the entire circuit such as the piping system including the water pipe 3 and the liquid feed pipe 4 of the mold 2 is washed with a washing liquid or is washed with water (or treated with a neutralization treatment liquid). Work safely with negative pressure in the entire circuit.

The air intake valve 5 is used when the residual cleaning liquid or residual polluted water (or residual pollutant treatment liquid) in the entire circuit is discharged outside the circuit, and the air is introduced into the entire circuit. The suction pump 7 is operated to absorb the residual cleaning liquid or the residual polluted water (or the residual pollutant treatment liquid), and at the same time, the entire circuit is sucked in to replace the cleaning liquid, and the cleaning liquid treatment work, the cleaning liquid transfer work, etc. can be performed safely. Do it promptly.

The filter 6 is a member for cleaning the water pipe 3 of the mold 2 to filter and purify the contaminated cleaning liquid from which rust, scale, mold and the like have been removed. An intermediate portion from the liquid outlet 3-2 to the suction pump 7 (specifically, a manifold 13 in which the liquid delivery pipe 4 is piped at a portion closer to the suction pump 7 than the liquid outlet 3-2 of the water pipe 3 of the mold 2).
Next, the liquid supply pipe 4 is piped, and the contaminated cleaning liquid for cleaning the water pipe 3 is introduced by the operation of the suction pump 7 to filter and purify impurities. The filter 6 is a commercially available product having a structure in which a filter medium is arranged in a tubular shape inside a filter housing 6-1 and a tubable head 6-2 is detachably attached to an upper opening thereof. The liquid pipe 4 is piped, and the dirty cleaning liquid is introduced into the tubular filter medium inside the filter housing 6-1. The filter 6 filters and purifies not only the pollutant washing liquid but also impurities in the polluted water (or the polluted treatment liquid) obtained by washing (or neutralizing) the water conduit 3 of the mold 2.

The suction pump 7 is capable of self-priming for emptying and circulating the cleaning liquid or water (or the neutralization liquid) throughout the entire circuit such as the piping system of the water pipe 3 of the mold 2 and the liquid feed pipe 4 and the idle operation. A device (as an example, a bellows type pump called Velopon manufactured by Nikkiso Eiko Co., Ltd.)
The cleaning liquid tank 1 is disposed closer to the cleaning liquid tank 1 than the filter 6, and the liquid supply pipe 4 is installed, and the cleaning liquid or water (or the neutralization treatment liquid) filtered and purified by the filter 6 is sucked,
The liquid is sent to the drainage switching valve 8 and the cleaning liquid tank 1. As the suction pump 7, a gear pump, a piston pump, a diaphragm pump, a tube pump, or the like can be used as long as it is a pump capable of self-priming and idling.

The drainage switching valve 8 is filtered by the filter 6,
A device used when the purified cleaning liquid or water (or the neutralization liquid) is discharged to the cleaning liquid tank 1 or the washing tank 9 without being collected, and is disposed between the suction pump 7 and the cleaning liquid tank 1. When the cleaning liquid or water (or the neutralization treatment liquid) is not collected, the liquid supply pipe 4 is connected, and the recovery circuit is switched to the discharge circuit. When the discharge work is completed, the recovery circuit is switched again to prepare for the recovery of the next work. The drainage switching valve 8 may be a well-known three-way valve as long as it can shut off liquid and gas.

In FIG. 1, the purpose of connecting the liquid delivery pipe 4 to the cleaning liquid tank 1 by means of the hose holder 12 is to make it easy to replace the cleaning liquid tank 1 with the rinsing tank 9 and to transfer the rinsing tank The purpose is to simply connect to the pipe 4 so that a predetermined cleaning liquid processing operation (water washing operation or neutralization processing operation) can be performed safely and quickly. If the hose holder 12 is a commercially available product, it is used.

The manifold 13 is used for simplifying the piping of the liquid supply pipe 4, facilitating maintenance, improving operability, and the like. Like the well-known manifold, the manifold 13 communicates with a plurality of openings. It is configured as a manifold having a plurality of flow passages. (FIG. 4 exemplifies seven openings and four flow paths communicating with these openings.)

Next, claim 3 will be described with reference to FIG. Prior to the description, the same members, devices, structures, etc. as described in claims 1 and 2 will be denoted by the same reference numerals in FIG. 2 and redundant description will be omitted. Claim 3 different from the system of claim 1
The system of (1) is such that two three-way valves 10 and 11 are interposed in the liquid feeding pipe 4, both the washing liquid tank 1 and the water washing tank 9 are detachably connected to the liquid feeding pipe 4.

One of the three-way valves 10 is connected to the liquid feed pipe 4 on the way from the washing liquid tank 1 to the manifold 13, and the liquid feed pipe 4 is also piped from the three-way valve to the water washing tank 9 to make the three-way valve 1
By switching 0 and operating the suction pump 7, the cleaning liquid in the cleaning liquid tank 1 and the water (or the neutralization processing liquid) in the washing tank 9 can be alternately circulated in the water pipe 3 of the mold 2. To configure.

The other three-way valve 11 is connected to the liquid feed pipe 4 on the way from the drainage switching valve 8 to the cleaning liquid tank 1, and the liquid feed pipe 4 is also connected from the three-way valve to the water washing tank 9. Three-way valve 1
By switching 1 and operating the suction pump 7, it is possible to alternately collect the contaminated cleaning liquid and the contaminated water (or the contaminated treatment liquid) that has cleaned the remaining cleaning liquid in the cleaning liquid tank 1 and the cleaning tank 9. .

Even though the two three-way valves 10 and 11 have the same structure as a known three-way cock used for switching the flowing direction of gas, liquid, etc., they were developed according to the application of the present invention. It does not matter whether it is a three-way valve or not.

Next, the usage will be described. Two 3-way valves 1
Both 0 and 11 are communicated with the cleaning liquid tank 1, the air intake valve 5 is closed, and the suction pump 7 is operated.
Then, the cleaning liquid in the cleaning liquid tank 1 is sucked and circulated through the three-way valve 10 to the whole of the negative pressure circuit formed by the water pipe 3 of the mold 2 and the liquid supply pipe 4 and the like, and the entire circuit is cleaned, and the dirty cleaning liquid Is filtered and purified by the filter 6 and collected in the cleaning liquid tank 1 via the three-way valve 11. When this cleaning is completed, the air intake valve 5 is opened in the continuous operation of the suction pump 7 to absorb the residual cleaning liquid of the entire circuit,
At the same time, it replaces the sucked air with the cleaning liquid.
Filter and purify with, and wash solution tank 1 via three-way valve 11.
To collect.

As soon as the remaining cleaning liquid removal operation is completed, the two three-way valves 10 and 11 are both switched to communicate with the water washing tank 9, the air intake valve 5 is closed, and the suction pump 7 is operated. Then, the water in the washing tank 9 or the neutralization treatment liquid is sucked through the three-way valve 10 and circulated through the entire negative pressure circuit formed by the water pipe 3 of the mold 2 and the liquid feed pipe 4, The entire circuit is washed or neutralized, the polluted water or the polluted solution is filtered and purified by the filter 6, and is collected in the flush tank 9 via the three-way valve 11. When this washing or neutralization process is completed, the air intake valve 5 is opened while the suction pump 7 continues to operate, and the residual polluted water or residual polluted treatment liquid of the entire circuit is sucked and replaced with the sucked air at the same time. The treatment liquid is filtered and purified by the filter 6 and collected in the water washing tank 9 via the three-way valve 11.
Next, examples will be described.

1. Experimental Example-1 For cleaning a plastic molding die (for 5 ounces) that has not been used for 12 months or more, a cleaning liquid (Nissho Pipe Cleaner NA-P) contained in a 4 l plastic tank and tap water for cleaning contained in a 4 l plastic tank were used. And the washing solution was circulated for 10 minutes, the filter was markedly stained dark brown. After that, when tap water for cleaning was circulated for 5 minutes and the water passage effect of the water pipeline was confirmed, it took 8 minutes to discharge 4 liters of water through the water pipeline before cleaning. ,
It was just under 1 minute after washing. When the dirt washed out with the washing liquid is examined by atomic absorption spectrometry, iron, calcium, magnesium, etc. are found to be large in quantity, and are thus determined as iron rust and scale components.

2. Experimental Example-2 A molding die different from Experimental Example-1 was used for a 5 ounce plastic molding die which has not been used for 10 months or more, and a cleaning liquid for a 4 l plastic tank (Nissho Pipe Cleaner NA.
After performing the suction cleaning treatment in -P), the red rust was not promptly washed out as in Experimental Example-1, and the black paste-like substance began to cover the filter wall. As a result of examination, it was a black mold that propagated in the water pipe. Then, after circulating the antifungal agent for 5 minutes and switching to normal washing water, the same results as in Experimental Example-1 were obtained.

[0030]

[Effects] Since the present invention is configured as described above, the following effects are exhibited. If the air intake valve is closed and the suction pump is operated, the entire circuit formed by the water pipe and liquid transfer pipe of the mold becomes negative pressure. Therefore, accidents such as disconnection of the liquid supply pipe during work are unlikely to occur, and it is possible to prevent the accidental scattering of the cleaning liquid due to this accident and the accident of bathing the cleaning liquid by the workers, and performing cleaning work, cleaning liquid recovery work, and water washing work. Alternatively, it is possible to safely perform a conventionally dangerous work such as a neutralization treatment work and a collection work of polluted water or a polluted treatment liquid, which can increase the collection rate by the collection work. And since the cleaning liquid tank and the water washing tank can be exchanged, it is dangerous to replace the tanks, open / close the air intake valve, operate the suction pump, etc. It is possible to safely and quickly perform work accompanied by.

Further, since the washing liquid tank and the water washing tank are connected to the liquid feeding pipe via the three-way valve, the above-mentioned various works include the switching of the three-way valve, the opening / closing operation of the air intake valve, the operation of the suction pump, etc. This can be done by a simple device operation, maintenance management becomes easy, and it is possible to reduce the production rate of defective products.

Further, by improving the recovery rate of the cleaning liquid, it is possible to eliminate the risk of the cleaning liquid being mixed in the waste water when the system is washed with water, and to discharge the water as safe water. Furthermore, several types of cleaning liquids with different qualities (for example, liquids that are dangerous when mixed) can be easily exchanged by replacing the tank, so if you use a cleaning liquid dedicated to the removal target, the removal work time will be significantly increased. It can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of a cleaning system of the present invention.

FIG. 2 is another example of the system.

FIG. 3 is an explanatory diagram of piping in an example of the system.

FIG. 4 is an explanatory diagram of piping using a manifold.

FIG. 5 is a schematic explanatory view of a conventional technique.

[Explanation of symbols]

1 ... Cleaning liquid tank 2 ... Mold 3 ... Water pipeline 4 ... Liquid transfer pipe 5 ... Air intake valve 6 ... Filter 7 ... Suction pump 8 ... Drainage switching valve 9 ... Washing tank 10, 11 ... 3-way valve

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B03B 1/00-13/06 B08B 3/00-3/14 B01J 4/00 B29C 33/00-33/76

Claims (3)

(57) [Claims] 1. A liquid feed pipe is connected from a cleaning liquid tank to a liquid inlet of a mold water pipe, and an air intake valve is connected to the liquid pipe at a portion closer to the cleaning liquid tank than the liquid pipe inlet. From the liquid outlet of the water pipe, through a filter, pipe a liquid feed pipe to the suction port of a suction pump capable of self-priming and idle operation, and from the discharge port of the suction pump via a drain switching valve. A simple cleaning system for water pipes of a mold in which a liquid delivery pipe is connected to the cleaning liquid tank again. 2. A simple cleaning for a water pipe line of a mold according to claim 1, wherein the suction port and the discharge port of the liquid supply pipe are detachably connected to a cleaning liquid tank, and the cleaning liquid tank is replaceable with a water cleaning tank. system. Wherein the cleaning liquid tank via a three-way valve to piping feeding tube liquid inlet port of the water lines of the mold, and then piping the liquid feed tube in the washing tank from the three-way valve, further wherein the water tube Connect an air intake valve to the liquid delivery pipe at a position closer to the cleaning liquid tank than the liquid inlet of the channel, and from the outlet of the water channel to a suction port of a suction pump that can self-prime and run idle through a filter. the liquid feed tube and pipe, via a switching valve for drainage from the discharge port of the suction pump liquid feed tube piping in the cleaning liquid tank, liquid feed pipe on the way leading to the cleaning solution tank from the liquid discharge switching valve A simple cleaning system for a water pipe line of a mold in which a three-way valve different from the above-mentioned three-way valve is provided, and a liquid delivery pipe is detachably attached from the three-way valve to the water washing tank.