JPS6320653Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents compressed air from blowing out to the outside world when the lid that covers the opening provided in a pressurized airtight container to communicate with the outside world is removed. related to a device for

Generally, when conveying highly dust-producing powder, hazardous substances, or dangerous substances, a conveyor 3 is placed in a closed container 1 as shown in Figure 1 to prevent adverse effects on the human body and the surrounding environment. There is a closed conveyance device in which the inside of the closed container 1 is pressurized by installing such conveyance equipment. In the figure, 5 is a charging chute, 7 is a discharge chute, and an opening/closing gate 9 is provided at the opening of the charging chute 5 inside the closed container 1. Reference numeral 11 denotes a clean conveyor for conveying objects that have fallen from the conveyor 3 out of the conveyed objects supplied to the conveyor 3 from the input chute 5 to the discharge chute 7.

In such a closed conveyance device, depending on the type of conveyed object, the conveyed object may adhere to or become clogged in the input chute 5 and the discharge chute 7, making inspection, cleaning, removing clogs, etc. is necessary. For this work, all production lines to which this sealed conveyance device belongs are stopped, and a door is placed inside the sealed container 1.
From 3, a cleaning port is provided near the area where workers enter to clean and the area where adhesion or clogging is likely to occur, so that it communicates with the outside world, and this is covered. It is conceivable to open the lid and perform the work from the outside of the closed container 1 through the cleaning port. However, the former requires the production line to be stopped, causing a problem of reduced production, while the latter does not cause the problem of reduced production, but since the sealed container 1 is under pressure when the lid is opened, compressed air is At the same time, there was a problem that the conveyed objects were blown out from the cleaning port.

This idea solves each of the above problems.
To provide a device that prevents a conveyed object from being blown out together with compressed air even when a cleaning port provided in a part where adhesion or clogging is likely to occur is opened.

Hereinafter, the pressure blowout prevention device according to this invention will be explained in detail based on one embodiment. The pressure blow-out prevention device 15 is provided, for example, on the wall surface of the closed container 1 facing the discharge chute 7 as shown in FIG. It has a small diameter tubular body 17 provided in the.

The lower end of the large diameter tubular body 19 is airtightly connected to the upper end of the small diameter tubular body 17 . The inner circumferential surface of this large diameter tubular body 19 consists of a vertical surface 20 from the upper end to the middle and an inclined surface 21 from the middle to the lower end, and the inner diameter between the vertical surfaces 20 is smaller than the outer diameter of the small diameter tubular portion 17. The inner diameter of the inclined surface 21 gradually decreases from the inner diameter between the vertical surfaces 20 to the outer diameter of the short tubular body from the top to the bottom.

Inside the large diameter tubular body 19, a small diameter tubular body 23 having the same outer and inner diameters as the small diameter tubular body 17 is arranged concentrically with the small diameter tubular body 17 and forms a predetermined gap 25 between the lower end and the inclined surface 21. It is arranged so that
Note that the lower end portion of the small diameter tubular body 23 is inclined parallel to the inclined surface. A flange 27 is formed around the upper end of the small diameter tubular body 23, and this flange 27 is in contact with the upper end of the large diameter tubular body 19 via a packing 29. 23 is supported. Also, the large diameter tubular body 19
A chamber 30 is formed between the inner circumferential surfaces 19, 20 and the outer circumferential surface of the small diameter tubular portion 23, with only the gap 25 as an outlet.

A piping fitting 31 is airtightly attached to the wall portion of the small diameter tubular body 23 corresponding to the vertical surface 20, and this piping fitting 31 is connected to a compressed air source (not shown) having a higher pressure than the pressure inside the closed container 1. ing.

Above the small diameter tubular body 23, a small diameter tubular body 33 having the same inner and outer diameters is arranged concentrically with the small diameter tubular body 23. A flange 34 is formed around the lower end of this small diameter tubular body 33, and this flange 34 is in contact with the flange 27 via circular rubber sheets 37, 37 that function as packing. is connected to the upper end of the large diameter tubular body 19 by a screw (not shown). Therefore, the small diameter tubular bodies 17, 23, 33
and the large diameter tubular body 19 are hermetically coupled to each other. Note that a cross-shaped cut is made in the center portion of the rubber sheets 37, 37, as shown in FIG.
A lid 35 is detachably attached to the upper end of the small diameter tubular body 33 to cover it airtightly.

The pressure blowing device constructed in this manner is used as follows. When there is no conveyed object attached to the discharge chute 7 or there is no clogging, the lid body 35 airtightly covers the upper end of the small diameter tubular body 33.
The closed container 1 and the small diameter tubular body 17 are also airtightly connected, and the small diameter tubular bodies 17, 23, 33
Since the large-diameter tubular body 19 and the large-diameter tubular body 19 are also airtightly connected to each other, the compressed air inside the closed container 1 does not blow out to the outside.

In a state where objects to be conveyed are clogged or adhered, air at a pressure higher than the pressure inside the sealed container 1 is started to be supplied into the large diameter tubular body 19 via the piping fitting 31, and then the lid 35 is removed and the cleaning tool is removed. is inserted into the upper end of the small diameter tubular body 33 and cleaned. In this state, since the room 30 has only the gap 25 as an outlet, air with a higher pressure than the pressure inside the sealed container 1 blows out into the sealed container 1 through the gap 25, and the compressed air inside the sealed container 1 and The conveyed object is prevented from blowing out toward the outside of the closed container 1. In addition, since the rubber sheets 37, 37 having a cross-shaped notch in the center are used, blowing out is further prevented.

Therefore, by using the pressure blow-out prevention device according to this invention, it is possible to remove the adhesion of conveyed objects and clogging from the outside of the closed container 1, so there is no need to stop the production line to which the closed container 1 belongs, and this eliminates the problem of reduced productivity. does not occur. Moreover, even if the lid body 35 is removed for cleaning, compressed air or conveyed objects are not blown out, and the structure is simple and the manufacturing cost is low.

In the above embodiment, the pressure blowout prevention device according to this invention was provided on the wall of the closed container 1 facing the discharge chute 7, but it may also be attached to the discharge chute 7 itself as shown by the dashed line in FIG. , it may be provided in the charging chute 5 itself or in the chute portion connecting the charging chute 5 and the closed container 1. Further, although the rubber sheets 37, 37 having a cross-shaped notch in the central portion are used, an annular packing may be used instead. Moreover, the small diameter tubular body 23,
33 are formed separately, but they may be formed integrally, or the small diameter tubular body 17 may be removed and the large diameter tubular body 19 may be directly hermetically coupled to the closed container 1. Alternatively, the small diameter tubular body 23 may be removed and the lid 35 may be airtightly and removably provided at the upper end of the large diameter tubular body 19.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a sealed conveyance device implementing a pressure blow-out prevention device according to this invention, Fig. 2 is a longitudinal sectional view of the same pressure blow-out prevention device, and Fig. 3 is taken along line A-A in Fig. 2. It is a partially omitted cross-sectional view along. 1... airtight container, 5... charging chute, 7...
Discharge chute, 17, 19, 33...pipe body, 25
... Gap (spout), 30 ... Room, 31 ... Piping fittings, 35 ... Lid.

Claims (1)

[Scope of utility model registration request] One end of the tubular body is placed in a pressurized airtight container or an input chute or a discharge chute that is airtightly connected to the airtight container.
A lid is removably connected to the input chute or the discharge chute so as to communicate airtightly with the other end of the tubular body, and the lid is removably attached to the one end of the tubular body. A pressure blowout prevention device for a closed container, which comprises a chamber with a spout opening toward the container, input chute, or discharge chute, and a pipe that supplies pressure higher than the pressure inside the closed container connected to this room. .