JPH0213359Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a slider gate mainly used as an outlet from a powder storage tank to an air transport path.

[Background of the invention] In general, grains such as wheat or other granular materials are divided into several storage tanks and stored, and when necessary, they are taken out by dropping them from the outlet at the bottom of the storage tank, and then taken out by an appropriate conveyance means. Equipment that sends the material to the next stage of processing is often used. FIG. 6 shows an example of such powder transport equipment, in which slider gates 2, 2, 2 which can be opened and closed as appropriate are provided at the bottom of the powder storage tanks 1, 1, 1 of Nos. 1 to 3. The granular material dropped from the gate is conveyed through the air transport pipe 3 under negative pressure by the suction type blower 4, and is introduced into the next stage mixing tank 5.

By the way, the slider gate as described above is generally provided with a slider that advances and retreats in the horizontal direction below the outlet, but when this slider is advanced to close the outlet, There have been cases in which the powder particles deposited on the slider become clogged between the slider and the lower edge of the outlet, impeding the closing operation of the slider.

Furthermore, in the above-mentioned powder and granular material conveyance equipment, it is common to arrange a valve gate for airtightness to form a pair with the slider gate of each storage tank. Figure 6 No.
When extracting powder from only one storage tank, if the other storage tanks (No. 2, No. 3) are not airtight, powder from the other storage tanks may be mixed in or transportation may become unstable. However, in this case, it goes without saying that if the slider gate itself has an airtight maintenance function, there is no need for a valve gate for airtightness maintenance, and from this point of view, slider gates with an airtightness maintenance function have also been proposed. There is.

Moreover, in this case as well, there is the problem that powder and granules are placed on the slider when it is closed, as described above, and the powder and granules are caught in the sealing part, resulting in poor sealing and damage to sealing members such as seal rings. be.

[Purpose of invention]

The present invention has been made from the above-mentioned viewpoints, and its purpose is to provide a slider gate used at a powder outlet of a powder storage tank that has improved operating performance.

Another object of the present invention is to provide a slider gate having a structure that can easily provide airtight sealing properties by simply improving the existing slider gate.

[Summary of the idea]

In order to achieve the above-mentioned object, the powder and granular material storage tank according to the present invention has a powder and granular material outlet formed by a fixed cylindrical portion at the lower part, and a horizontal direction from the lower position of this outlet is provided. In a slider gate provided with a slider so as to be able to move forward and backward in the horizontal direction between a retracted position where the outlet is retracted outward to open the outlet and an advanced position where the lower side is closed, a first guiding means for guiding the movement of the slider to a position near the advancing position; and a second guiding means for guiding the slider to move upward near the advanced position.
a ring cylinder provided inside the outlet in a floating manner and having an outer diameter dimension substantially touching the inner circumferential surface of the outlet and capable of vertical movement within a certain range in the vertical direction; a seal ring that annularly engages with the upper surface of the slider guided upward by the first guide means to airtightly seal the outlet, and the lower floating limit position of the ring cylinder is moved by the first guide means. The structure is such that the lower end of the ring cylinder is spaced apart from the upper surface of the slider with a minute gap being maintained.

[Example of idea]

The present invention will be described below based on an embodiment of a slider gate of the airtight seal type shown in the drawings.

1 and 2 are longitudinal sectional views of the slider gate, with FIG. 1 showing the outlet when it is closed and FIG. 2 showing it when it is open.

FIG. 3 shows a plan view including a partial cross section of the slider gate.

In these figures, 12 is a short fixed cylindrical body forming an outlet, and the storage tank 1 located above
It is fixed at the bottom end of 1. Reference numerals 14 and 15 are slider gate housing cases that are integrally fixed to the lower end of the fixed cylindrical body 12.

Reference numeral 16 denotes a slider arranged so as to be able to reciprocate within the storage cases 14 and 15 from the position shown in FIG. 1 to the second position, and in the position shown in FIG. It has a flat plate shape that can be covered.

Reference numeral 17 denotes a screw drive device disposed inside the storage case 15, in which a female screw 20 assembled to the slider 16 is connected to a male screw shaft 19 which rotates by transmitting the rotational force of the forward/reverse rotation motor 18. The slider 1 is screwed together in a non-rotational manner, and the slider 1 is rotated by the rotation of the male threaded shaft 19.
6 to reciprocate. The female screw 20 and the slider 16 are preferably attached in such a way that the slider 16 is allowed to tilt slightly in the vertical direction in FIG. It's okay. Furthermore, in this example, the reciprocating movement of the slider 16 is performed by the screw drive device 17, but this may be done by other means such as an air cylinder device. 2
Reference numerals 1 and 21 designate rotary driven rollers disposed within the storage case 14, which are arranged as a pair on both sides of the outlet 13 as shown in the figure so as not to interfere with powder falling from the outlet 13. It constitutes a first guide means for guiding the motion. The rotation driven rollers 21, 21 cooperate with inclined cams 22, 23 fixed to the lower surface of the slider 16 to prevent the slider 16 from moving upward when the outlet is closed (see FIGS. 1 and 3). The seal drive mechanism also serves as a second guide means for causing the sealing. That is, the slider 16 moves from the position shown in FIG.
direction, the outlet 13 gradually begins to close, and just before the final stage of closing, the inclined cam 22,
23 are engaged with the rotating driven rollers 21, respectively, and as the slider 16 continues to advance, the slider 16 is pushed upward along the taper of the inclined cams 22 and 23. Then, the upper surface of the slider 16 comes into contact with the fixed seal ring 24 made of an elastic body on the side of the fixed cylindrical part 12, and when the pressing force reaches a predetermined pressure, the advancing movement is stopped and an airtight seal is achieved. Closing of the outlet port 13 is completed.

In order to prevent the slider 16 from jumping during the advance movement of the slider 16 as described above, the inclined cam 22 on the advancing front side and the inclined cam 23 on the advancing rear side are positioned in the axial direction of the rotary driven roller 21. It is desirable that the rotary driven roller 21 on the right side of FIG. 1 and the inclined cam 22 be provided so as not to engage with each other.

As described above, in the slider gate, in this example, the following ring cylinder 25 is further attached to the fixed cylinder part 1.
It has the characteristic of being placed within 2.

The ring cylinder 25 of this example is provided as a cylindrical body with an outer diameter that faces the inner circumferential wall of the fixed cylindrical part 12 with a slight gap, and is arranged downwardly at the circumferential portions of the upper and lower edges. It is formed to have a cone-shaped taper portion whose diameter gradually decreases toward . Further, a plurality of hanging arms 26 each having a T-shaped upper end are attached to a part of the upper edge of the outer circumference of the ring cylinder 25, and these hanging arms 26 are attached to a stopper bracket 27 fixed to the inner wall of the fixed cylindrical part 12. By engaging with the ring cylinder 25, the downward movement limit of the ring cylinder 25 is set. The details of this structure are shown enlarged in FIG.

The ring cylinder 25 of this example is supported by a stopper bracket 27 in the takeout port open state in which the slider 16 has been retracted as shown in FIG. At the same time, when the slider 16 is advanced below the outlet 13, the slider 1
6 and can move freely upwards.

In the slider gate configured as described above, in which the ring cylinder is installed inside the opening, when the slider 16 is advanced downward to the opening 13 to close the opening, the lower end of the ring cylinder is connected to the upper surface of the slider. Since the powder and granules falling onto the slider 16 are regulated by the lower end of the ring cylinder 25, the amount of spreading outward from the ring cylinder 25 is suppressed to an extremely small amount. Since the amount of powder falling from between the inner circumferential wall of the fixed cylindrical portion 12 and the outer circumferential wall of the ring cylinder 25 is small, the amount of powder particles falling from between the inner circumferential wall of the fixed cylindrical portion 12 and the outer circumferential wall of the ring cylinder 25 is small, so that it is The amount of intervening powder and granules becomes sufficiently small, and therefore sealing failure due to entrapment of the powder and granules in this abutment area.
The risk of damage to the seal member has been significantly reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but in short, a ring cylinder is placed on the slider that advances to close the outlet to prevent the powder from spreading on the slider. It is sufficient that the presence of the ring cylinder minimizes the amount of powder and granules that get in the way when airtight sealing is performed between the upper surface and the fixed part via the sealing member. It goes without saying that various aspects of the initial engagement between the advancing slider and the ring cylinder can be selected.

Furthermore, the structure for imparting airtight sealing properties is not limited to that of the embodiment described above, and any suitable structure may be adopted as necessary.

[Effect of idea]

As described above, according to the present invention, it is possible to provide a slider gate with a configuration that improves operation, and in addition, in the conventional slider gate that also serves as an airtight seal, it is formed like a blind alley for sealing. There is a problem that powder and granules gradually accumulate in the sliding part, which makes the operation heavy as the opening and closing are repeated.However, in the slider gate of the present invention, the ring cylinder is installed in a floating manner independent of the slider. Therefore, when the slider is opened, both the inner and outer sides of the ring cylinder are completely opened downward, and the powder and granules that are placed on the ring cylinder as the slider moves are regulated by the lower end of the ring cylinder. Therefore, as a result, accumulation of powder and granules does not occur as in the conventional device, and the occurrence of seal failures can be reduced and durability can be improved.

Further, as in the example described in the above-mentioned embodiment, there is an effect that an airtight sealing property can be easily provided to an existing slider gate only by adding a ring cylinder and its suspension means.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views of an embodiment of the slider gate according to the present invention, with FIG. 1 showing the gate when it is closed and FIG. 2 showing the gate when it is open. Third
4 is a perspective view of the ring cylinder, FIG. 5 is a partially enlarged front view, and FIG. 6 is a diagram showing an example of powder conveyance equipment. 1... Powder storage tank (storage tank), 2... Slider gate, 3... Air transport pipe, 4... Suction blower,
5...Mixing tank, 11...Powder storage tank (storage tank), 1
2... Fixed cylindrical part, 13... Outlet, 14, 15
... Accommodation case, 16 ... Slider, 17 ... Screw drive device, 18 ... Forward/reverse rotation motor, 19 ...
Male screw shaft, 20... Female thread, 21... Rotating driven roller, 22, 23... Inclined cam, 24... Seal ring, 25... Ring cylinder, 26... Hanging arm, 2
7...Stotsupa bracket.

Claims (1)

[Claim for Utility Model Registration] With respect to the powder/granular material outlet formed by a fixed cylindrical part at the lower part of the powder/granular material storage tank, the outlet is retracted horizontally outward from a position below this outlet. In a slider gate provided with a slider so as to be able to move forward and backward in the horizontal direction between a retracted position for opening and an advanced position for closing the lower part, the slider is guided to move from the retracted position to the vicinity of the advanced position. a first guide means for moving and guiding the slider upward in the vicinity of the advanced position; a ring cylinder provided in a floating manner so as to be able to move up and down within a certain range of directions; and a seal ring that annularly engages the upper surface of the slider guided upward by the second guide means to airtightly seal the outlet. The lower floating limit position of the ring cylinder is set at a position where the lower end of the ring cylinder is spaced apart from the upper surface of the slider moved by the first guide means with a minute gap maintained. Gate.