JPH0227255Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an emergency shutoff valve used in scrap processing equipment, etc., which has the function of crushing scraps such as automobiles and other scraps and sorting them into iron, non-ferrous metals, non-metals, etc.

In such equipment, combustible materials such as fuel may remain in the scrapped vehicle, and there is a risk that this combustible material will ignite and explode due to sparks generated within the shredder. Furthermore, when an explosion occurs in the shredder, there is a risk that a secondary explosion may occur in the cyclone or bag filter of the dust collector.

Japanese Patent Laid-Open Publication No. 1973-11 was developed as a device aimed at minimizing damage in the event of an explosion accident such as the one mentioned above.
There is one described in Publication No. 63569.

This known technique includes a shutoff valve that rotates by explosion to close one duct in the joint of orthogonally connected ducts, and a locking device that locks the shutoff valve in the closed position, and a locking device that locks the shutoff valve in the closed position. A mesh-like opening is provided in the chamber, which is covered with an aluminum plate, and the aluminum plate is blown off by an explosion, allowing exhaust to be exhausted through the opening.

In the case of the conventional device described above, when an explosion occurs, the blast wave is released into the atmosphere from the middle of the duct, which is effective in minimizing disasters, but in the event of a violent explosion, the isolation valve There is a risk that the locking device will not operate reliably, and there is also the problem that in the case of a fire that does not involve a blast, the shutoff valve will not operate and the opening section will not open.

Furthermore, there is the problem that the ducts cannot be installed unless they are perpendicular to each other, and if the aluminum plate is blown off by a blast, it will take a lot of effort to restore it.

The purpose of this invention is to solve the problems of the conventional devices as described above.

In other words, this invention provides an opening in one side wall of the duct in the middle of a straight section of the duct, and a rotatable valve plate that opens and closes the opening using the upstream side of the opening as a fulcrum. In the closed position, it is flush with the side wall of the duct opening formation part,
At the position where the valve plate opens the opening and blocks the duct, the free end of this valve plate hits the inner surface of the duct side wall facing the opening and is held in an inclined shape, blocking the duct and blocking the flow from the upstream side. In order to guide the gas coming into the opening, the length from the fulcrum side end of the valve plate to the free end is made longer than the distance between the opening forming side wall of the duct and the opposite side wall, and the duct The outer side of the valve plate is engaged with an engaging member of the valve plate when the valve plate is in the open and closed position, and when an emergency signal from an explosion detection device or a fire detector is received, this engaging member is released and the valve plate is released under its own weight. Or, it is provided with a locking means that is set to the blocking position by a spring.

The details of this invention will be explained below based on an embodiment shown in the accompanying drawings.

Figure 1 shows a scrap processing facility using this invention. 1 is an apron conveyor for receiving unshredded scraps such as scrap cars, and there is a receiving box 2 on the entrance side of the apron conveyor, and the scraps put into this box 2 are is the entrance 4 of the next pre-shredder 3
sent to.

The pressure shredder 3 has, for example, three crushing shafts, and the rotation of a large number of crushing teeth provided on each of the crushing shafts coarsely crushes the scraps and drops them into the entrance of the supply apron conveyor 5.

The outlet of the supply apron conveyor 5 faces the input port 7 of the main shredder 6. The main shredder 6 has, for example, a vertical rotating shaft in the center of the shell, and finely crushes scrap between a striker provided on the rotating shaft and a shell liner inside the shell.

Therefore, it enters the input port 7 by the apron conveyor 5, is fed into the main shredder 6 by the supply vibrating sieve 8, and the finely crushed crushed material is dropped from the outlet 9 via the vibrating conveyor 10 to the inlet of the discharge conveyor 11.

The crushed materials placed on the discharge conveyor 11 are sorted by the sorting device 1
Sent to 2. This device 12 has vibrating conveyors 13, 14 and magnetic separators 15, 16, and is used to separate metals into nonmetals, iron, and nonferrous metals.

the pre-shredder 3, the main shredder 6,
Ducts 17, 18, 1 communicating with the sorting device 12
9 and 20 are the cyclone separators 2 of the dust collector 22
It communicates with entrances 5, 26, and 27. Further, the duct 28 communicating with the outlets of the cyclone separators 25 and 26 communicates with the inlet of the bag filter 29.
This baggage filter 29 and the cyclone separator 2
Ducts 30 and 31 which respectively communicate with the outlets of 7 communicate with the suction ports of exhaust fans 32 and 33, respectively.

A is an emergency shutoff valve provided in the duct 28 leading to the inlet of the bag filter 29, and has a structure as shown in FIGS. 2 and 3. In this figure, 35 is a rectangular opening provided on the upper side of the duct 28, and a receiving plate 36 is provided on the outer periphery of the opening, and the duct 28 has a rectangular cross section in this portion. Numeral 37 is a valve plate that closes the opening 35 from the inside, and a gasket 38 is fixed to the inner surface of the receiving plate 36 so as to be in close contact with the periphery of the valve plate 37.

A plurality of protrusions 39 are provided on the outside of one end of the valve plate 37, and the protrusions 39 are rotatably attached to a plurality of protrusions 40 provided on the outside of the duct 28 by means of a shaft 41. An engaging member 45 is provided on the outside of the free end side of the valve plate 37.
A support stand 46 is fixed to the outside of the duct 28, and the engagement hole 49 in which the reciprocating rod 48, which is removably fitted to the guide tube 47 fixed to the support stand 46, is removably engaged is connected to the engagement hole 49. It is provided in the member 45.

The advance/retreat rod 48 is connected by a shaft to the piston rod of an air cylinder 50 which is swingably mounted on the support base 46, and the control valve of the air cylinder 50 is provided in the main shredder 6.
The circuit is configured to be activated by an emergency signal from the fire detector C or fire detector C.

In the above configuration, the air cylinder 50 does not work during normal operation, and at this time, as shown in FIG. held in the closed position.

In this state, if an explosion or fire occurs in the main shredder 6, the explosion detection device B or the fire detection device C will operate and issue an emergency signal, the control valve of the air cylinder 50 will operate, and the air cylinder 5
0, the retractable rod 48 is pulled out from the hole 49.

Therefore, the valve plate 37 is brought into a closed position as shown by the chain line in FIG. 3 due to its own weight or the action of a spring. Also, at this time, since the airflow in the duct 28 is flowing in the direction of the arrow in FIG. to prevent it from burning out.

Further, when the valve plate 37 shuts off the duct 28 in this manner, the opening 35 is opened, the main shredder 6 side of the duct 28 is opened to the atmosphere, and combustion gas and the like are discharged to the atmosphere.

This idea is installed in the straight part of the duct as mentioned above, and an opening is provided in one side wall of the duct.
A rotatable valve plate is provided to open and close the opening using the upstream side of the opening as a fulcrum, and when the opening is closed, this valve plate is flush with the side wall of the opening forming part of the duct, so when the opening is closed. In this case, the valve plate is not likely to act as a resistance to the airflow passing through the duct, and can be provided at any position in the straight part of the duct.

Further, the outside of the duct is engaged with an engaging member of the valve plate when the valve plate is in the open and closed position, and when an emergency signal from an explosion detection device or a fire detector is received, this engaging member is opened and the valve is opened. Since a locking means is provided to set the plate to the cutoff position by its own weight or a spring, it is safe because the duct is cut off not only in the case of an explosion but also in the case of a fire without a blast.

Further, at the position where the valve plate opens the opening and blocks the duct, the free end of the valve plate hits the inner surface of the duct side wall facing the opening, and is held in an inclined shape.
In addition to blocking the duct, it has the effect of guiding gas flowing from the upstream side to the opening, so the single valve plate acts to discharge blasts and hot air and prevent these blasts and hot air from flowing into the bag filter, etc. Both functions of preventing flow can be performed at the same time. Moreover, after the explosion or fire has subsided, the valve plate can be returned to its original position simply by placing it in the open and closed position and locking the engaging member of the valve plate using the locking means, making recovery work easier. be.

[Brief explanation of the drawing]

Fig. 1 is a side view of a scrap processing facility as an example of a facility implementing this invention, Fig. 2 is a partially cutaway cross-sectional plan view showing an embodiment of the emergency shutoff valve of this invention, and Fig. 3 is the same as above. It is a partially cutaway vertical side view. 28...Duct, 35...Opening, 37...Valve plate, 45...Engaging member.

Claims (1)

[Scope of utility model registration request] An opening is provided in one side wall of the straight section of the duct that leads to a place where there is a risk of explosion or fire, such as a scrap processing facility. A valve plate is provided, and at the position where the valve plate closes the opening,
The valve plate is flush with the side wall of the opening forming part of the duct, and at the position where the valve plate opens the opening and blocks the duct, the free end of this valve plate hits the inner surface of the duct side wall facing the opening, and is held in an inclined shape. The length from the fulcrum side end of the valve plate to the free end is the same as the side wall of the opening forming part of the duct, so that the duct is blocked and the gas flowing from the upstream side is guided to the opening. The outer side of the duct is engaged with the engaging member of the valve plate in the open and closed position of the valve plate, and when an emergency signal from an explosion detection device or a fire detector is received, The emergency shutoff valve is provided with a locking means that opens the engaging member and sets the valve plate to the shutoff position by its own weight or a spring.