JPH0222815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inspecting sanitary ware for water leakage and air leakage under reduced pressure.

When using sanitary ware, there is a risk of water leakage,
There should be no air leaks. In order to maintain the quality of manufactured sanitary ware and sell ceramics with a certain quality on the market, manufactured sanitary ware is inspected for water leakage and air leakage. Conventionally, the method of testing sanitary ware for water and air leaks is to place the ware horizontally, fill the water reservoir in the trap of the porcelain with water, and check for water and air leaks by checking the changes in the water level on a manometer. A method was adopted to do so. According to this method, first hold the pottery horizontally, fill the reservoir in the trap with water, seal the drain opening of the drain channel with an iron plate coated with urethane resin or rubber, and then open the solenoid valve. When the water level on the manometer reached a certain level, the solenoid valve was closed, and after a certain period of time the water level on the manometer was checked to check for water leakage or air leakage from the pottery. However, with this method, the water leakage and air leakage tests are performed after filling the water reservoir in the pottery trap with water, so if there are any water or air leakage points in the pottery, the drainage channel must be checked before the inspection. There is a possibility that it will get wet, and if it gets wet, defects such as minute cracks and pinholes will be blocked by water, reducing inspection accuracy. In addition, it is only possible to inspect for water leakage and air leakage from drainage channels, and furthermore, with the current configuration, the pressure can only be applied to about 80 mm of water column, so the inspection accuracy is poor, and the depressurization method The drawback was that water flowed into the road, making inspection impossible.

The present invention eliminates the drawbacks in the prior art and
To provide a method for inspecting water leakage and air leakage from ceramics.

An object of the present invention is to provide an inspection method that does not use water in the inspection process, so sanitary ware does not get wet with water, and has high detection accuracy.

A feature of the present invention is that it is possible to inspect all water leakage and air leakage throughout the pottery.

A feature of the present invention is that the test pressure for reduced pressure can be increased (for example, about 2000 mm of water column), so water leakage and air leakage can be tested with high precision in a short time.

The feature of the present invention is that since it is a method of inspecting water leakage and air leakage by reducing pressure, sanitary ware can be sealed with a weak pressing force.

A further feature of the present invention is that the pressure within the sanitary ware can be stabilized quickly and the sanitary ware can be inspected for water leakage and air leakage in a short time. A further feature of the present invention is that the inspection accuracy is improved by reducing the internal volume of the sanitary ware using a box or the like.

In order to facilitate understanding of the present invention, prior art methods will first be described in detail. FIG. 3 shows a conventional method for testing sanitary ware for water leakage and air leakage. A Western-style toilet bowl will be explained as a representative example of sanitary ware. The sanitary ware 101 has a drainage channel 130,
The drainage channel 130 is separated from the water supply port by a ceramic wall 138, and has an upper opening 134 at the top and a lower opening, ie, a drain 136 at the bottom. Drain port 13
A sealing device 105 for sealing the iron plate 10
3, a sealing body 102 made of urethane resin or rubber, and an air cylinder 104, and a conduit 140 is provided to penetrate the sealing device 105. One end of the conduit 140 is connected to the manometer, and the other end communicates within the drainage channel. A conduit 142 branches from the conduit 140, and a solenoid valve 1
It is connected to one end of 10. The other end of the solenoid valve is connected to a pressure source (not shown).

The inspection process in the prior art is as follows. First, the sanitary ware 101 is placed horizontally, the internal trap reservoir 132 is filled with water, and the sealing body 102 is pressed against the drain port 136 by the air cylinder 104 to seal the drain channel 130. Next, the solenoid valve 110 is opened to pressurize the inside of the drain channel 130. When the water level on the manometer 120 reaches a certain water level B, the solenoid valve 110 is closed and a water leakage and air leakage test is started. When the water level of the manometer 120 is higher than the water level C after a certain period of time, it is determined that there is no leakage of water or air from the sanitary ware 101, and when it falls below the water level C, it is determined that there is a leakage of water or air. be done.

Next, a preferred embodiment of the invention of the present application will be described with reference to FIGS. 1 and 2.

FIG. 1 shows the sanitary ware 10 in a state before water leakage and air leakage testing is started, that is, before a pressure reducing device 20 and sealing devices 30, 40 are attached to the sanitary ware 10. In Figure 1, sanitary ware 1
0 has a ball top surface 12 that opens upward, a water supply port surface 14, and a drain port surface 16 that opens downward, and is placed on a pallet 19.

The pressure reducing device 20 includes a sealing part 15, an air cylinder 25, and solenoid valves 26, 27, and 28. , and a box 23 for reducing the internal volume of the sanitary ware 10. The box 23 is penetrated by conduits 29, 18, 19, and 58. One end of the conduit 29 is connected to one end of the electromagnetic valve 26, and the other end opens into the interior of the sanitary ware 10. The conduit 18 is of small diameter, one end of which is connected to one end of the solenoid valve 27, and the other end opening into the interior of the sanitary ware 10.
The conduit 19 is of small diameter, one end of which is connected to one end of the solenoid valve 28, and the other end connected to the sanitary ware 1.
It opens into the inside of 0. One end of the conduit 58 is connected to the second
As shown in the figure, it is connected to a water column pipe 54, and the other end is
It opens into the inside of the sanitary ware 10. In FIG. 2, a conduit 59 branches off from the conduit 58, and one end of the conduit 59 is connected to one end of the electromagnetic valve 56. The pressure reducing device 20 is configured such that its sealing body 21 can be pressed against the upper surface of the sanitary ware ball by an air cylinder 25 in a sealing manner.

The other end of the solenoid valve 26 is connected to a pressure reduction source, that is, a vacuum pump (not shown), and the solenoid valves 27, 28, 5
The other end of 6 is open to the atmosphere.

The conduits 18 and 19 and the solenoid valves 27 and 28 alleviate the pressure change inside the sanitary ware 10 when the inside of the sanitary ware 10 is depressurized, and the manometer 5
The purpose is to quickly stabilize the zero water level. However, devices for stabilizing the pressure, namely lines 18, 19 and solenoid valves 27, 28
Water leakage and air leakage can be inspected using the manometer 50 without providing any.

To be more specific, during the inspection, the pressure may be monotonically reduced until the water level in the manometer reaches position C (for example, water level 2000 mm), but the sealing body made of urethane resin or rubber and the iron plate may gradually be removed due to the reduced pressure. Moreover, because of the large deformation, it is known from experience that it takes a considerable amount of time to adjust the water level to position C by monotonous depressurization. Therefore, C
The position of B is slightly higher than the position of (for example, water level 2500
After reducing the pressure all at once to the vicinity of mm) and greatly deforming the sealing body and iron plate, the solenoid valves 27 and 28 were opened to gradually inject atmospheric air, but it was confirmed that the water level could be adjusted to position C in a short time. The inventors verified this through experiments.

The upper sealing device 30 is composed of an iron plate 34 , a sealing body 36 made of urethane resin, rubber, etc., and an air cylinder 32 . It can be pressed against the mouth surface 14 in a sealing manner.

The lower sealing device 40 is composed of an iron plate 44, a sealing body 46 made of urethane resin, rubber, etc., and an air cylinder 42. It is designed so that it can be pressed freely against the mouth surface for a seal.

Figure 2 shows a pressure reducing device 20, sealing devices 30 and 40.
The state shown is that it is set to sanitary ware. The manometer 50 connected to the pressure reducing device 20 is composed of a water tank 52 filled with water and a water column pipe 54, and the water level A indicates the atmospheric pressure before starting to reduce the pressure in the sanitary ware 10. . The water level B indicates the internal pressure of the sanitary ware 10 when the sanitary ware 10 is depressurized. The water level C is determined by closing the solenoid valve 28.
The internal pressure of the sanitary ware 10 is displayed when the internal pressure of the sanitary ware 10 is stabilized. Water level D
indicates the internal pressure of the sanitary ware 10 when the solenoid valve 28 and the solenoid valve 27 are also closed to stabilize the internal pressure of the sanitary ware 10. The water level E indicates the limit water level when determining whether there is water leakage or air leakage in the sanitary ware 10.

Next, a process of inspecting the sanitary ware 10 for water leakage and air leakage will be explained.

The pressure reducing device 20 is lowered by the air cylinder 25, and the ball upper surface 12 is sealed. Next, the upper sealing device 30 is lowered by the air cylinder 32 to seal the water supply port surface 14. Lower sealing device 40
is raised by the air cylinder 42, and the drain port surface is sealed. Open the solenoid valve 26 and remove the sanitary ware 10.
Depressurize the inside of the When the water level of the water column pipe 54 inserted into the water tank 25 rises to B, the solenoid valve 26 is closed, and at the same time the solenoid valves 27 and 28 are opened.
The pipes 18 and 19 are opened to the atmosphere to stabilize the pressure inside the sanitary ware 10. The water level of the water column pipe 54 is C
When the temperature drops to this point, the solenoid valve 28 is closed. When the water level in the water column pipe 54 has fallen to D, the electromagnetic valve 27 is closed to start testing the sanitary ware for water leakage and air leakage.
After a certain period of time has elapsed, if the water level in the water column pipe 54 is between D and E, it is determined that there is no water or air leakage in the sanitary ware 10, and if the water level in the water column pipe falls below E, then It is determined that the sanitary ware 10 has water leakage or a leakage device. Here, if the pressure is above D, the pressure has not fallen to the specified pressure, and if it has fallen below E, the product has a defect. In other words, when the test is between D and E, it is determined that the test is in a normal detection state and has passed.
When the inspection is completed in this way, the solenoid valve 56 is opened to bring the inside of the sanitary ware 10 and the inside of the manometer 50 to atmospheric pressure. Next, the air cylinder 42 is lowered and the air cylinders 25 and 32 are raised to return to the state before the start of the test. In addition, the water level (A, B,
The determinations of C, D, and E) are detected by known electrical and optical methods, and do not limit the present invention. As explained above, the features of the present invention are (1) sanitary ware does not get wet with water, and detection accuracy is high.

(2) All sanitary ware can be inspected for water and air leaks.

(3) Since the inspection pressure can be increased, inspection can be carried out in a short time and with high accuracy.

(4) Since a pressure reduction method is used, sealing is easy and reliable.

(5) By using a box and reducing the internal volume of the ceramic, pressure stabilization is quick and detection accuracy is improved.

(6) Since it is equipped with a pressure relief device, inspections can be carried out in a short time.

(7) This operation does not require much human effort, so
It greatly contributes to automation and labor saving.

[Brief explanation of drawings]

FIG. 1 shows the sanitary ware in a state before water leakage and air leakage testing is started, and shows a sectional view of the sanitary ware, a pressure reducing device for sealing it, and a sealing device. FIG. 2 shows a state in which sanitary ware is tested for water leakage and air leakage, and shows a sectional view of the sanitary ware, a pressure reducing device, a sealing device, a manometer, and a pressure relief device. FIG. 3 is a schematic diagram for explaining a conventional water leakage and air leakage testing method. ○A represents the state in which water is stored in the water reservoir inside the trap, and ○B represents the state in which the inside of the trap is pressurized. 10... Sanitary ware, 20... Pressure reducing device, 50...
...Manometer, 18, 19... Pipeline, 27, 28
...Solenoid valve, A, B, C, D, E...Water level.

Claims (1)

[Claims] 1. A method for inspecting sanitary ware for water leakage and air leakage, which includes sealing the entire opening of sanitary ware to reduce pressure, and reading changes in the water level of a manometer communicating with the inside of the sanitary ware after the pressure has been reduced. How to test for water leakage and air leakage. 2. In the method of testing sanitary ware for water leakage and air leakage, the sanitary ware is sealed and depressurized, then the pressure inside the sanitary ware is stabilized, and changes in the water level of a manometer communicating with the depressurized interior of the sanitary ware are read. A method for inspecting water leakage and air leakage according to claim 1.