SU1425357A1 - Rack for testing mine alarm initiators under pressure - Google Patents

Abstract

The invention relates to mining automation and is intended for testing mine signaling devices of mine air composition used in coal mines at gas control points. In order to simplify the design, a sealed vessel (HS) 6 of variable volume is installed at the bottom of the hermetic chamber (BG) 1 with sealing doors 5, and a static load 7 is attached to it. 21, one inlet of which is connected to the environment, and the second through a valve 22 to a source 23 of compressed air. The mine alarm 12 for mine air is installed in HA 1 and connected to external monitoring devices. the degree of filling of the HS 6, it is possible with high accuracy to set the required pressure value in the HA, recorded by the pressure gauge 29. Depending on the need to test the detector 12, the pressured by pressure or vacuum is released or filled with air of HS 6. Then CL 1 is closed by door 5. The required quantity of the component of the gaseous medium is started from cylinder 31. It is agitated by the fan 8 installed in HA 1 and monitored by composition by composition meter 30. 2 h. apt. 2 Il. wed (L

Description

5 and

four

Yu

sd

SAZ SL

25

Fiel

The invention relates to mining automatics and safety engineering, and more specifically to methods and devices for testing mine signaling devices of mine air composition, and can be applied at mining automation plants, in coal mines and at gas contact points. | roll.

The aim of the invention is to simplify 1 stand construction.

FIG. 1 shows the layout of the proposed stand; in fig. 2 - possible 1: | implementation of static load.

The test bench for testing of iodine shaft signaling devices by pressure consists of a closed hermetic chamber 1 divided by a partition with partition 2 into first 3 and second 4 parts.

The sealed chamber I is equipped with sealing doors 5, ensuring that it is sealed by them. In the second part 4 of the cage: 1, there is a vessel 6 with a variable volume, on which the static load 7 is located. If necessary, measure the gaseous medium on one of the walls of the sealed chamber 1, the fan 8 is fixed, the axis 9 of which is through the un; introduced into the first part 3 of the hermetic chamber, the gaseous medium in which, if necessary, is displaced by the impeller 1 1 of the fan 8. On a rigid partition 2 in the first part 3 of the chamber 1 there is a mine air detector 12 which is connected to the chamber 13-15, the number of which can be large, insulated from the case of the sealed chamber 1 by bushings 16-18 and used to connect the detector 12 to the external devices to ensure its operation and control parameters (no indicator). The outlet 19 of the vessel 6 with a variable volume is first pneumatically and the inlet of the hermetic chamber 1 formed by the pneumatic fitting 20 is connected to the outlet of a three-way valve 21, the first inlet of which is connected via a valve 22 to a source of compressed air 23, for example connected via a reducer 25 to a valve 22. In addition to fitting 20, fittings 26-28 are provided in the stand, which form the subsequent pneumatic inputs of chamber 1, through which, if necessary, connect, for example, a pressure gauge 29, a gauge 30 in the gaseous medium in the closed chamber 1, the cylinders 31 (the number of cylinders, as the number of pneumatic inlets, can be increased depending on the number of variable components of the gaseous medium) with components of the gaseous medium that can, if necessary, be changed during the tests of the detector 12. Unused specific test pneumatic inputs

(one such input is shown in Fig. 1 as an example) 32 is sealed with a plug 33. Static load 7 consists of individual weights 34 strung together

on flexible ti 35 and fastened to them with screws 36.

Testing of mine signaling devices of mine air composition for a change in pressure is implemented by the following sequence of operations.

Mine detector composition of mine air is installed in a sealed chamber. Connect the detector to external control devices. In a sealed chamber set sealed

5 vessel of varying volume. In a sealed chamber, the prescribed composition of the mine air is established according to its methane, carbon monoxide and carbon dioxide content, humidity, dust, and other components. Increase the volume of a sealed vessel that

0 results in an increase in pressure in the hermetic chamber while maintaining the composition of the mine air (constant relative content of all components). Reduce (if necessary) the volume of the hermetic vessel, which leads to a decrease in the pressure in the chamber while maintaining the composition of the mine air in it.

The stand works as follows. The indicator 12 is scrambled on a rigid partition 2 in the first part 3 of the sealed chamber 1. The indicator 12 can be connected to the terminal m 13-15 to connect it, for example, to a power source and means to control any parameter (not shown). If necessary, testing of the detector 12 with an overpressure in the initial state, a three-way valve 21 connects the outlet 19 of the vessel 6 to the atmosphere. Under the action of a static load and due to the pressure difference in the vessel 6 and the atmosphere, compressed

 - the air from the vessel 6 with variable ms. The volume of the output is IT, and the vessel 6 receives its minimum volume (in Fig. 1 the dotted line is shown). After that, the chamber 1 is closed by sealing doors 5,

5 provide sealing chamber 1. Then, with a three-way valve 21, the outlet of the vessel 6 with a variable volume is connected through an open valve 22 to a source 23 of compressed air. At the same time, through valve 22, a three-way valve 21, unit 20 and inlet 19, pressurized air enters vessel 6, under the action of which the volume of the vessel begins to increase, the upper plane of which, together with static load 7, begins to move towards rigid partition 2. This reduces the volume occupied by the mine air in the sealed chamber 1, and the pressure in the chamber increases proportionally, which is recorded

A pressure gauge 29 connected to the hermetic chamber 1 through the nipple 26. At the same time, by changing the degree of filling of the vessel 6 of the changing volume, it is possible to set the required pressure in chamber 1 with high precision, the maximum value of which is determined by the ratio of the volumes of the sealed chamber 1 and vessel 6 variable volume. In this case, the composition of the mine air in the hermetic chamber 1 relative to the initial state remains unchanged.

If necessary, the test of the detector 12 and under reduced pressure in the initial state, the vessel 6 of the changing volume must be filled with compressed air from the source 23 of compressed air in the manner described. Then, the hermetic chamber 1 is sealed with sealing doors 5, which ensure the sealing of the closed chamber 1. The valve 22 is closed, which prevents the inflow of compressed air from the source 23 of compressed air into the vessel 6 of variable volume. The three-way valve 21 is installed in a position connecting the outlet 19 of the vessel 6 with the atmosphere. As a result of the pressure difference in vessel 6 and the atmosphere and under the action of static load 7, air from vessel 6 is released into the atmosphere, and the volume of vessel 6 is reduced, which results in an increase in the volume of mine air in a sealed chamber and a proportional decrease in pressure of mine air in a sealed chamber 1 changes in the composition of the mine air, which is recorded by the pressure gauge 29. The maximum range of measurement of vacuum in the case of using a cylindrical sealed (closed) chamber (as the most rational from the point of view of manufacturability and obtaining strength characteristics), and consequently, increasing the efficiency of the stand is increased by performing a static load in the form of individual weights 34 strung on flexible The rods are 35 and fastened to them with screws 36. This is achieved due to the fact that the static load 7 in the extremely low position is located along the cylindrical tion surface sealed (closed) chamber 1 with a gap defined by the design parameters of the vessel 6 (e.g., stiffness and thickness of the material from which the vessel is made 6). In the case of making a static load 6 in the form of a solid plate, its lower position is limited by the width of the static load plate 7, which is in its extreme lower position the chord of the circumference of the cylindrical body sealed (closed) chamber 1,

0

and the decrease in the volume of the vessel 6 is limited by the volume, defined by the width of the plate, the diameter of the body of the closed chamber 1 and the length of the vessel 6

volume.

If it is necessary to test the detector 12 with an overpressure m or with dilution of mine air, with a change in one (or several) components (for example, CH4, CO, CO2, etc.), a pressure bottle is connected to the sealed (closed) chamber 1 via nozzles 27 and 28 31 (if necessary, several through additional unions) with a component of mine air that has been changed and a meter 30 of composition

5 mine air, respectively. When this detector 12 is placed on a rigid partition 2 sealed (closed) chamber 1. Depending on. the need for testing by overpressure or vacuum is released and 1 and 1

0 by air vessel 6. Thereafter, the closed chamber 1 is closed by a sealing

the door 5. From the cylinder 31, the required amount of the variable component of the gaseous medium is started, which is not alternated by the fan 8 and is monitored by composition by the composition meter 30. Further tests are carried out as described.

thirty

Claims (3)

Invention Formula . A test bench for testing pressure signaling shaft detectors containing a sealed chamber with sealing doors isolated from the camera body to the lemmas of connection of the test signaling device installed in the pressure chamber and connected to the terminals of the fan The choke points of the hermetic chamber are sources with components of mine air, characterized in that. in order to simplify the design, it is equipped with a hermetic vessel of variable volume, a static load and a series-connected compressed air source, a valve and a three-way valve, the other entrance of which 5 is connected to the environment, and the outlet is connected to an airtight vessel that changes the volume, e-state volume, which is installed at the bottom of the sealed chamber, and a static load is fixed on the airtight vessel of variable volume. 0 2. A stand according to claim 1, characterized in that the sealed vessel of a changing volume is made in the form of an elastic chamber. 3. The stand according to claim 1, characterized in that the static load is made as separate weights connected one to another. It is flexible, made, for example, in the form of cables. 3 3534 J4 J5 35 Sigi 2 J4 Y & 35 35 35