JPH0487645A - Explosion-proof crusher - Google Patents

Abstract

PURPOSE:To effectively prevent explosion due to sparks in crushing with a small amt. of inert gas by blowing an inert gas such as steam directly into the crushing zone from the blowoff port to a feed hood or the crusher main body within an effective distance on the upstream side of the crushing zone. CONSTITUTION:The crusher main body 3 and a feed hood 2 having a charge material inlet 1 on the upstream side are provided. A blowoff port 12 is furnished to the hood 2 or main body 3 within an effective distance on the upstream side of the crushing zone where air flows downward. An inert gas such as steam and nitrogen is blown directly into the crushing zone from the blowoff port 12. Consequently, explosion due to sparks in crushing is effectively prevented with a small amt. of the inert gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blast-proof crusher that blows steam into a crushing zone.

[Conventional technology]

When various solid wastes are crushed by a crusher, collisions between dangerous substances contained in the waste, such as flammable or explosive substances such as organic solvents, peroxides, and explosives, occur inside the crusher.
Sparks from abrasion may cause an explosion.

As a conventional explosion-proof crusher equipped with a mechanism to prevent such explosions, steam is blown into the inside of the crusher body, and
In order to prevent steam blown into the crusher from leaking out and condensing into white smoke, a crusher is known in which high temperature dry air is blown into the inlet and outlet sides of the crusher.

[Problem to be solved by the invention]

However, in the configuration of the conventional blast-proof crusher described above,
Steam is blown directly into the crusher body, and high-temperature dry air to prevent condensation and white smoke is blown near the crusher inlet and outlet, so there is no air flow between the crusher body and the inlet area. The steam that leaks out condenses into white smoke.

For this reason, when monitoring the crushing situation inside the crusher with a television camera installed above the crusher entrance, the camera's view is obstructed, and this is insufficient as a measure to prevent steam from condensing into white smoke.

Furthermore, in addition to the piping inside the crusher main body, external piping is required to blow high-temperature dry air around the inlet and outlet of the crusher, resulting in a problem that the apparatus as a whole becomes complicated.

This invention was made in view of the current state of the conventional blast-proof crushers mentioned above, and its first purpose is to efficiently apply steam or an inert gas such as nitrogen to the crushing zone of the crusher body. An object of the present invention is to provide a blast-proof crusher capable of preventing explosions caused by sparks.

A second object is to provide a blast-proof crusher which converts inert gas into steam, utilizes the high temperature of this steam to keep the inside of the hood warm, and prevents the steam from condensing into white smoke due to rapid cooling.

[Means to solve the problem]

Therefore, in this invention, as a means for solving the above first problem, the crusher body is provided with an input hood having an input material supply port upstream of the crusher main body, and an air flow is provided upstream from the crushing zone where air flows from the upper part to the lower part. A blast-proof crusher configuration was adopted in which an air outlet was provided on the input hood or the crusher body within the effective distance of the crusher, and steam or inert gas such as nitrogen was blown directly into the crushing zone from this air outlet. .

It is preferable that the effective distance range is 400 mm upstream of the crushing zone.

Further, as a means for solving the second problem, in contrast to the configuration of the first invention, the input hood has a double structure with inner and outer walls, and steam is passed between the inner and outer walls and the steam is blown out from the outlet. The structure of the blast-proof crusher was adopted so that the blast could be released.

Furthermore, in place of the above-mentioned solution, a blast-proof crusher may be used in which a heat-retaining tube is wrapped around the outer wall of the charging hood, and steam is passed through the tube and the steam is blown out from the outlet.

[Effect]

The explosion-proof effect of the explosion-proof crusher of the first invention configured as described above is achieved by blowing non-containing gas such as steam or nitrogen directly into the crushing zone from the outlet provided in the immediate vicinity of the inlet of the crusher main body. It is obtained by lowering the oxygen partial pressure in the crushing zone with an active gas.

In this case, the effective distance range is determined by the interrelationship between the speed of the air flowing through the crushing zone and the flow rate and pressure of the steam or inert gas blown out, and is the distance at which the most effective explosion-proofing effect can be obtained.

Generally, it is effective to set this effective distance range to approximately 400 yen.

Further, in the third invention, the input hood is formed as a double wall structure, and steam is passed between the walls to keep the space inside the hood warm from the outside, thereby preventing the steam from cooling rapidly.

Therefore, the blown-out brown air is prevented from condensing into white smoke.

In place of the double wall structure of the third invention, the fourth invention provides a heat-retaining tube to cover the outer wall of the input hood to obtain the same effect.

Therefore, in this case as well, the steam is prevented from condensing into white smoke.

〔Example〕

Embodiments of the present invention will be described below with reference to the attached sections.

FIG. 1 is a diagram showing the overall schematic configuration of a blast-proof crusher according to a first embodiment.

This blast-proof crusher has a charge hood 2 having a charge supply port 1 for receiving charge fed from a conveyor C.
and a crusher main body 3 connected to the lower end of the hood, further provided with a discharge chute 5 connected to an opening 4 provided laterally at the bottom of the crusher main body, and a mounting base 6 at the lower end. A television camera 7 for monitoring is provided above the input hood 2.

As shown in the figure, the input hood 2 is formed as a heavy-walled structure with inner and outer walls 8. It is blown out laterally from the outlet 12.

Although not shown in the drawings, members are provided between the inner and outer walls 8 and 9 of the double-walled structure in order to obtain structural strength, and these connecting members are provided in a lattice pattern to separate each space. They may also communicate through small holes.

The outlet 12 at the lower end of the input hood 2 is provided at an appropriate position above the crushing zone to prevent an explosion even if sparks are produced during crushing in the crusher main body 3.

The air outlet 12 can be provided at the lower end of the input hood or at the crusher main body 3 within a range of about 400s+n from the upper surface of the breaker (described later) at the upper end of the crushing zone where air flows from the top to the bottom.

Although the crusher main body 3 is a vertical shell nodder in the illustrated example, it goes without saying that the type of the crusher is not limited to this example.

This crusher main body 3 has a shell liner 14 appropriately laid inside a shallow tapered shell 13 with a wide upper part, and a breaker 16, a flaker liner 17, and A rotor disk 18 is attached below, and a plurality of grinders 19 are attached between the rotor disks. 20.21 is a sweeper and a sweeper liner. Further, a drive device 22 is provided below the rotor shaft 15.

The discharge chute 5 is formed as a chute that sends out the crushed materials discharged from the opening 4 downward, and the crushed materials are discharged by a conveyor C' provided below. A dust collection duct 23 is provided at the upper part of the discharge unit 5 to collect dust from the crusher.

The explosion-proof effect of the explosion-proof crusher of this embodiment constructed as described above can be obtained as follows.

The waste input from the conveyor C passes through the input material supply port 1 of the input hood 2 and is sent to the crusher main body 3 below. The input material is blown away by the breaker 16 and breaker liner 17 rotating inside the crusher main body 3, and is thrown into the liner 1 inside the shell 13.
4 and is crushed, moved downward and further crushed into fine pieces by the grinder 19 and liner 14, and then discharged from the opening 4 at the bottom.

Since the input materials are continuously input and processed, subsequent input materials are input one after another even during crushing within the crusher main body 3. Therefore,
Sparks generated due to impact, friction, etc. during the above-mentioned crushing may ignite the hazardous substances contained in the subsequent input material and cause an explosion.

However, in the crusher of this embodiment, the tea air is passed through the space 10 between the double walls of the input hood 2, and is blown out laterally from the outlet 12. This steam-containing exhaust gas is sucked downward, thereby lowering the oxygen partial pressure in the crushing zone where sparks occur, thereby preventing the risk of explosion.

In this case, the steam used is blown out just near the inlet of the crusher body 3, so there is no need to fill the upper part of the hood and the exhaust port of the crusher body 3 with steam as in the conventional case. Usage amount can be reduced. Note that other inert gases such as nitrogen may be used as the steam.

In addition, when using steam instead of inert gas, the input hood 2 has a double structure with inner and outer walls 8 and 9, and the steam is passed through the space 10 between them, so that the air inside the input hood 2 is not exposed to the outside. is kept warm. Therefore, since the steam blown into the hood is not cooled, the steam in the hood is prevented from condensing into white smoke, and the visibility of the monitoring television camera 7 installed at the top is not obstructed.

FIG. 2 is a diagram showing the overall schematic configuration of a blast-proof crusher according to a second embodiment.

This embodiment differs from the first embodiment in that the input hood 2 of the first embodiment has a double structure with inner and outer walls, but a heat insulating tube 11' is wrapped around the outer wall 8 of the input hood 2 so as to cover it. . Other members that are the same as those in the first embodiment are designated by the same reference numerals and their explanations will be omitted.

In this embodiment, high-temperature steam is passed through a heat-retaining tube 11' wrapped around the outer wall 8 of the input hood 2 to keep the outer wall warm, so that the same effect as in the first embodiment can be obtained.

〔effect〕

As explained in detail above, in the blast-proof crusher of the first and second inventions, inert gas such as steam is supplied to the crushing zone from the input foot or the outlet provided in the crusher body within an effective distance upstream of the crushing zone. Since the material is blown out directly, explosions during crushing can be effectively prevented with a small amount of steam or inert gas. In the third and fourth inventions, in addition to having the above-mentioned explosion-proof effect, the inert gas is vaporized, the input hood is formed with a double wall structure or a heat insulating tube on the outer wall, and the insulating tube inside the double wall or the heat insulating tube is formed. Since the inside is kept warm by the tea air passing through and the steam inside is prevented from cooling rapidly, the advantage is that the steam can be prevented from condensing into white smoke and monitoring with a television camera can be carried out effectively.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of a first embodiment of a blast-proof crusher according to the present invention, and FIG. 2 is an overall schematic diagram of a second embodiment. 2...Input foot, 3...Crushing machine main body, 5...Discharge unit, 7...TV camera, 8.9...Inside Outer wall, 10・
...Space, 12...Blowout outlet,

Claims (4)

[Claims] (1) Equipped with a crusher main body and a charging hood having a charging material supply port upstream thereof, air is blown into the charging hood or the crusher main body within an effective distance upstream of the crushing zone where air flows from the top to the bottom. A blast-proof crusher characterized by having an outlet and blowing steam or an inert gas such as nitrogen directly into a crushing zone from the outlet. (2) The effective distance range is 400 mm upstream of the crushing zone.
The explosion-proof crusher according to claim (1), characterized in that: (3) The input hood has a double structure with inner and outer walls, and steam is passed between the inner and outer walls and is blown out from the outlet. Blast-proof crusher. (4) Claim (1) or (2) characterized in that a heat insulating tube is wrapped around the outer wall of the input hood, and steam is passed through the tube and the steam is blown out from the outlet.
Explosion-proof crusher described in .