JPH0245199Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a bridge breaker for hopper of powder and granular materials, and more specifically, it is applicable to the bridge breaker for powder and granular materials, etc. This method prevents particles, etc. (hereinafter referred to as powder or granular materials, etc.) from causing a bridging phenomenon and adhering to the inner wall surface of the lower part of the hopper or blocking the discharge port, or forcibly destroying these bridging, adhesion, and clogging. This invention relates to a bridge breaker that smoothly discharges powder and granular materials.

BACKGROUND OF THE INVENTION In a series of devices for handling powder, granular materials, etc., regardless of whether they are continuous type or batch type, a storage tank is provided to buffer the flow of powder, granular materials, etc. A hopper whose side wall is slanted and constricted toward the lower discharge port is often used to discharge powder and granular materials from the storage tank. Depending on the physical properties of the powder or granules handled at this time, a bridging phenomenon that impedes discharge often occurs in the hopper, interfering with the smooth operation of the entire apparatus.

In order to eliminate these obstacles, conventional methods include applying vibration or impact from the outside (vibration impact method),
A method in which air is blown into the hopper at the end of the tube or as a surface (aeration method), a method in which a blade is rotated along the inner wall surface of the hopper or near the outlet (wall agitation method), a method in which a movable wall is provided at the bottom of the hopper (wall fluctuation method) method), a method in which a flexible chute is provided at the bottom of the hopper and the chute is deformed (discharge port extrusion method), an elastic membrane or elastic bag is provided at the bottom of the hopper and fluid is fed in and discharged, or a cylinder, cam, etc. A method of expanding and contracting an elastic body (expansion and contraction method) and the like have been implemented.

However, these methods require the hopper to be processed to a corresponding degree, which may result in the creation of a resistance object inside the hopper that obstructs the discharge of powder or granules, or may prevent leakage of powder or granules. be the cause of
In addition, the structure became complicated, and remarkable effects were not necessarily obtained despite the ingenuity.

Problems to be solved by the invention This invention is one of the so-called expansion and contraction methods mentioned above, and several such methods have been proposed in the past. Among these, for example, there is a known method disclosed in Japanese Patent Application Laid-open No. 111165/1983, in which a flexible member is provided at the bottom of the hopper, and this flexible member is expanded and contracted by a movable piece or a cam. Another method is to provide multiple flexible bags, connect pipes to them, and inflate and contract the flexible bags by supplying and discharging fluid. Problems include the complicated attachment and connection between the bag and the pipe.

In addition to this, Utility Model No. 49-82472, Utility Model No. 51
-102178, in which a flexible body is provided at the lower slope of the hopper and fluid is introduced and discharged to expand and contract the flexible body. When mounting with bolts, etc., the locking piece is exposed in the hopper, and there are slopes with flexible bodies and slopes without, and the slopes as a whole are not smooth and become uneven. Therefore, there is a problem in that it actually encourages the formation of bridges in powder and granules.

Furthermore, there is a system disclosed in Japanese Utility Model Application Publication No. 54-24875, in which a diaphragm cylinder is installed on the inclined surface of the lower part of the hopper, which allows for a large degree of expansion without friction between the flexible bag that is expanded and contracted and powder, etc. Although a combination is provided, if the locking piece for attaching the diaphragm tube to the hopper is exposed, it will inevitably have a negative effect on preventing bridging of powder and granular material, as in the case described above. or,
There is also the problem that the attachment of these flexible bags and diaphragm tubes to the hoppers is unavoidable, and cleaning of powder and granules adhering to the flexible bags is also troublesome.

As mentioned above, the known expansion and contraction method is effective in directly applying an external force to the powder, but on the other hand, the installation of the expansion and contraction member, which is the means for expanding and contracting, is complicated, and the sealing This may cause problems with wear and sealing of the parts, or because these expansion/contraction members give the sloped surfaces inside the hopper a complicated shape, they may even encourage bridge formation or reduce the bridge breaking force. There are various problems such as.

The purpose of this invention is to eliminate the problems caused by these conventional devices and provide a bridge breaker that has a simple structure, can prevent the occurrence of bridges, and can reliably destroy them even if they occur. It's about doing.

Means for Solving the Problem In order to achieve the above-mentioned object, this invention provides a reverse cutting method for preventing or destroying bridging, which has two upper and lower flanges on the lower inclined wall portion including the discharge portion of the hopper. A cone portion having a conical shape is provided, and a flexible film is attached to the inner wall of the cone portion using the two flanges as attachment portions, and the flexible film is attached to the inner wall of the cone portion. It is characterized in that a cone section is provided with a flow pipe for pumping and discharging fluid between the membrane and the membrane.

Function: Powder or granules are placed in a hopper, and a fluid such as compressed air is continuously pumped and discharged from the feed/discharge pipe between the inner wall of the cone and the flexible membrane at controlled intervals for a controlled period of time. If this is done, this flexible membrane will repeatedly expand and contract toward the center of the cone, and the powder, etc. in the cone will be compressed inward, released outward, and It is subject to both vertical displacement and external force. The action of these external forces prevents the powder, granules, etc. in the hopper from forming bridges, or forcibly destroys the bridges that have already formed, allowing the powder, granules, etc. to flow smoothly through the discharge port. Make it more discharged.

Embodiment A preferred example of this invention will be described below with reference to FIG.

FIG. 1 is a longitudinal sectional front view of an embodiment of the invention, in which the supply section 1 is connected to the flange 6 of the cone section 3 by a flange 4 at its lower part. The lower flange 7 of the cone part 3 is connected to the flange 5 of the discharge part 2. A band-shaped flexible film 8 made of, for example, a rubber material film is adhered to the entire surface of the inclined inner wall of the cone portion 3,
Its upper edge is inserted between the flange 4 of the supply part 1 and the flange 6 of the cone part 3, while its lower edge is inserted between the flange 7 of the cone part 3 and the flange 5 of the discharge part 2.
It is inserted between. In this way, the supply section 1,
The cone portion 3 and the discharge portion 2 are fastened with bolts 11 and nuts 12 with the flexible membrane 8 sandwiched between their respective flanges to form a hopper. The feed/discharge pipe 13 is provided near the midpoint of the wall of the cone section, and a fluid such as air is controlled by a timer 15 via a solenoid valve 14 to flow between the cone section 3 and the flexible membrane 8. Pumped and discharged. The flexible membrane 8 shown by the solid line in FIG. 1 shows the state in which the fluid is discharged and the membrane is contracted, and the flexible membrane 8' shown by the dotted line shows the state in which the fluid is pumped and the film is expanded. There is.

In addition, when the supply section 1, cone section 3, and discharge section 2 are fastened with flanges as described above, in order to minimize unevenness on the inner surface of the hopper that promotes bridge formation of powder and granular material, the inner surface of the supply section 1 and It is preferable to set and fasten the flanges 4 and 6 between the inner surface of the flexible membrane 8 attached to the cone part 3 so as to prevent the flexible membrane 8 from protruding inward and forming a step when stored. . It goes without saying that the connection between the cone part 3 and the discharge part 2 should also be made so that the discharge part 2 does not protrude inward.

An example using a hopper equipped with a bridge breaker as described above will be described. Inclination angle of hoppa
60°, the direct diameter of the upper opening of the cone part 3 is 210 mm, the direct diameter of the discharge part 2 is 100 mm, the height of the cone part 3 is 100 mm, the height of the entire hopper is 250 mm, and the flexible membrane 8 has a thickness of 2 mm. Particle size is 325 mesh as powder in a hopper using a polyurethane soft film, moisture 8%
After confirming that (weight) of white clay will not be ejected even if it is compacted and struck with a hammer from the outside,
Air of 0.5Kg/cm ² G is supplied to timer 15 via a solenoid valve.
When the flexible membrane 8 was expanded and contracted by pressure feeding for 0.5 seconds and discharging for 5 seconds using the settings, the entire powder in the hopper was raised up and the powder was pumped for 5 seconds. The entire amount of powder and granules was easily discharged by repeating the discharge for two cycles.

Effects of the invention This invention is as described above, and the inner surface of the cone part between the supply part and the discharge part is covered with a flexible membrane,
A flow pipe for pumping and discharging fluid is provided between the inner surface of the cone part and the flexible membrane, and it does not have a complicated expansion and contraction mechanism unlike conventional ones, so there is no risk of wear and tear caused by these and seals. The simple structure has no unevenness on the hopper's inner surface, and the flexible membrane expands and contracts while being integrated with the hopper's inner wall, so it does not cause complicated expansion or contraction. It has the excellent effect of effectively preventing the occurrence of blisters without requiring the complication of attaching the shrinkable member, as well as reliably destroying the bridging that occurs and easily discharging powder and granules that are prone to bridging. It is something that brings.

The bridge breaker according to this invention can be applied to hoppers of any shape, such as hoppers of cylindrical, prismatic, eccentric cylindrical, or eccentric prismatic shapes, as well as straight or flaring hoppers. Of course.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an embodiment of this invention. 1... Supply section, 2... Discharge section, 3... Cone section, 4,
5, 6, 7...flange, 8...flexible membrane, 13...transmission/discharge pipe.

Claims (1)

[Scope of utility model registration request] A bridge breaking cone part 3 having a flange 6 and a flange 7 is provided between a supply part 1 having a flange 4 and a discharge part 2 having a flange 5,
A band-shaped flexible membrane 8 is attached to the inside of the cone portion 3,
Between the flanges 4 and 6 and between the flanges 5 and 7, the upper end 9 and the lower end 1 of the flexible membrane 8
0, and then the flanges 4 and 6 and the flanges 5 and 7 are fastened, and a flow pipe 13 for pumping and discharging fluid is installed in the gap between the cone part 3 and the flexible membrane 8. Hoppa's bridge breaker is characterized by being attached to the cone part 3.