JPS601748Y2 - Mask fixing device in mask testing equipment - Google Patents

Description

[Detailed description of the invention] The present invention is a mask used in a mask testing device that has a smooth surface on the test head used for mask performance testing, and allows for easy attachment and removal of the mask to the test head. It concerns a fixation device.

There are various types of masks depending on the purpose as respiratory protection equipment used to prevent the effects of organic substances on the human body in the working environment. It is stipulated that various performance tests such as , ventilation resistance test, and collection efficiency test be conducted.

When this performance test is conducted, a human head with a size specified by the JIS standard is used.
Since there are no regulations regarding the surface treatment of this human head,
Generally, silicone rubber is used, which resembles human skin as much as possible.

However, with silicone rubber, there are issues with process control and quality control on the mask production line, such as abrasion resistance, adhesion between the test head and the test mask, the complexity of putting on and taking off the mask, and corrosion resistance. There is a problem,
Furthermore, there was a risk of cross-contamination during performance testing of reusable masks.

The present invention solves these problems, eliminates the conventional method of fixing the test mask to the test person's head using head straps, improves the fit on the waist, and makes it easy to put on and take off, making it more efficient. The air suction tube inside the mask box of the mask testing device is made of a hard material such as ceramic or glass-lined metal installed inside the mask box. A mask fixing cylinder opened at the lip of the human head for testing and provided with a mask fixing member on the opposite side of the human head is disposed so as to be movable with respect to the human head. .

An embodiment of the mask fixing device in the mask testing device according to the present invention will be described with reference to the attached drawings.

In FIGS. 1 and 2, an inlet pipe 5 equipped with an aerosol inlet 3 and a clean air inlet 4 is attached to the upper side of the mask box 2, which has an openable lid 1 airtightly and freely openable and closable on the front surface. Mask box 2
An air suction tube 8 is attached to the lower side of the test head 7, which is opened at the lip of the test head 7 fixed on the test head attachment 6.

An upstream detector 9 for measuring the concentration of aerosol introduced into the mask box 2 is installed on the mask box side of the introduction tube 5, and an upstream detector 9 for measuring the concentration of aerosol introduced into the mask box 2 is installed in the air suction tube 8. A downstream detector 11 is installed for measuring the subsequent aerosol concentration.

Here, as the human head for testing 7, only the frontal region cut back and forth along the plane connecting both ears is formed of metal, the entire surface is lined with glass, and the head is placed on the human head mount for testing 6. A device fixed in the supine position is used.

On the side facing the test human head 7, that is, on the upper side of the mask box 2, there is a pair of mask fixing cylinders 12.1.
2 is airtightly arranged, and both mask fixing cylinders 12.
A mask face piece presser 14 made of a steel belt as a mask fixing member is stretched between the tips of the masks 12 via mounting attachments 13.13.

The mask fixing cylinder 12.12 is one that is raised and lowered by a torque motor 15 and that presses and fixes the test mask 10 onto the test human head 7 with a thrust of about 19 to 9, and the steel belt has a surface that is Those coated with synthetic resin such as vinyl chloride are used.

When the collection efficiency of the test mask 10 is measured by the above-mentioned device, the opening/closing lid 1 is first opened, the testing mask 10 is placed over the test human head 7 in the state of being used, and the opening/closing lid 1 is closed. .

Next, the torque motor 15 is activated, the mask fixing cylinder 7 cylinder 12.12 is lowered, and the mask 10 to be tested is strongly pressed against the test human head 7 by the mask face piece presser 14 and fixed.

After wearing the test mask 10, the aerosol collection efficiency is measured by a conventional method.

That is, although not shown, a suction pump connected to the lower end of the air suction pipe 8 is activated, and aerosol is introduced into the mask box 2 from the aerosol introduction port 3.

In the process, the aerosol first enters the mask box 2 after the concentration of the introduced aerosol is measured by the upstream detector 9 installed in the introduction pipe 5, and the aerosol enters the mask box 2 to be tested.
After passing through the absorption canister 16, the aerosol is sucked in by the air suction tube 8, and the concentration of the aerosol is measured by the downstream detector 11 installed in the air suction tube 8 after being collected by the absorption canister 16.

From the ratio of the aerosol concentration measured by the upstream detector 9 and the aerosol concentration measured by the downstream detector 11, the aerosol collection efficiency of the entire test mask 10 is determined.

Therefore, the aerosol collection efficiency of the absorber 16 of the test mask 10 is determined in advance before the test of the test mask 10, and this is compared with the collection efficiency determined from both of the detectors 9 and 11 described above. By doing this, if both collection efficiencies are equal, it is confirmed that there is no abnormality in the mask 10 to be inspected,
If the collection efficiency obtained from both the detectors 9 and 11 is lower than the collection efficiency of the absorption can 16, there is poor adhesion between the test mask 10 and the test human head 7, that is, the shape of the periphery of the test mask 10. Incompatibility or reused test mask 1
Regarding 0, it is possible that the surrounding rubber has deteriorated, so it is possible to check whether the mask 10 to be inspected itself can be used during work.

After the test of the test mask 10 is completed, the suction of the suction pump is stopped, the mask fixing cylinder 12.12 is raised by the torque motor 15, and the mask face piece presser 14 is separated from the test mask 10.

After that, clean air is introduced from the clean air inlet 4 to bring the inside of the mask box 2 to normal pressure, and then the opening/closing lid 1 is opened and the test mask 7 is removed from the test human head.

3 and 4 show a case where a half-face mask 17 is used as the test mask, and the half-face mask 17
When performing the performance test, the mask mask holder 14 described above is removed from the attachment 13.13, and the mask mask holder 14 is removed from the attachment 13.13, and a mask mask holder with a flat T-shaped metal holding plate 18a attached to the center of the same steel belt as described above is used. Both ends of the tool 18 are attached by attachments 13.13,
When the mask fixing cylinder 12.12 is lowered,
The half mask 17 is pressed by the metal holding plate 18a and fixed to the test head 7.

Other operations and measurement methods are the same as those for the test mask 10 described above.

As mentioned above, the test head in this invention is made of hard material such as ceramic or glass-lined metal, so it has superior durability and has a mirror-like surface compared to conventional silicone rubber ones. This increases smoothness, increases the airtightness and compatibility of the contact area with the test mask, contributes to improved test performance, and reduces corrosivity and adsorption to test aerosols. , easy to clean if the test head becomes contaminated.

For example, when testing the repeated use ability of a test mask, especially when testing the use ability of a test mask in cases related to radioactive materials, etc., if it is recognized that the test person is contaminated by the test mask, the following: In order to prevent the transfer of contamination to the masks to be tested, it is essential that test caps be easy to clean. It is extremely easy to remove contaminants compared to other products, and transfer of contaminants can be prevented as much as possible.

In addition, the test mask is attached to and removed from the test patient's head by simply pressing the test mask against the test patient's head and releasing the pressure using the mask fixing member by moving the mask fixing cylinder. Compared to the method of attaching and detaching the test mask to the human head for testing using a head strap, it is easier to attach and detach, and it is also easier to check the attachment status.
This is useful for improving operability and testing efficiency.

In addition, as shown in the examples, when the human head for testing consists only of the forehead, the volume of the mask box of the mask testing device can be reduced as much as possible.
It is possible to shorten the time for discharging aerosols and the like, and further shorten the test time for masks to be tested.

In addition, when the test head is placed on its back, the test mask can be easily attached, and it is stable.
Moreover, in combination with the lubricity of the surface of the human head for testing, the adhesion can be increased.

Furthermore, in the case where the mask fixing cylinder is made movable by a torque motor, the pressing force of the test mask against the test human head can be appropriately determined, which has the advantage of being highly versatile.

[Brief explanation of the drawing]

What is shown is an embodiment of the mask fixing device in the mask testing device according to the present invention. FIG. 1 is a sectional view showing the state of use, FIG. 2 is a sectional view of the main part, and FIG. A sectional view showing the state, and FIG. 4 is a plan view of one main part of FIG. 3. 2...Mask box, 7...Test head, 8...Air suction tube, 10...
Test mask, 12° 12...Mask fixing cylinder, 14...Mask face presser, 15...
... Torque motor, 17 ... Half mask, 18 ... Mask mask holder, 18a ...
・・Metal holding plate.

Claims (4)

[Scope of utility model registration request] (1) An air suction tube in a mask box in a mask testing device is opened to the lips of a human test subject made of a hard material such as ceramic or glass-lined metal installed in the mask box, and 1. A mask fixing device for a test apparatus, characterized in that a mask fixing cylinder equipped with a mask fixing member is disposed on a side opposite to the human head so as to be movable with respect to the human head. (2) A mask fixing device in a mask testing device according to claim (1), in which the human head for testing consists of only the forehead. (3) A mask fixing device in a mask testing device according to any one of claims (1) or (2), in which a human head for testing is placed on its back. (4) A mask fixing device in a mask testing device according to any one of claims (1) to (3), wherein the mask fixing cylinder is movable by a torque motor.