JPS5938151B2 - Safety device for hopper with stirring device - Google Patents

Description

[Detailed Description of the Invention] Conventionally, in a hopper equipped with an agitating device, a screen is appropriately placed under the hopper opening for safety reasons, but workers often forget to remove the screen and operate the hopper. When the operator accidentally drops his belongings into the hopper while driving, he may accidentally remove the screen while driving and stick his hand into the hopper, resulting in an unexpected injury.

As the above-mentioned countermeasure, it is possible to install a limit switch inside the hopper and cut off the operation circuit by removing the screen, but if the agitated material being handled is mortar, etc., install a limit switch similar to the above-mentioned limit switch inside the hopper. This has been a problem since malfunctions occur due to sticking of mortar, etc., making it useless.In view of the above-mentioned current situation, the present invention provides a screen that can be opened and closed by rotating the screen provided below the hopper opening. None, by making the rotating shaft protrude outside the hopper and engaging and disengaging the rotating member provided at the tip of the shaft with the transmitting member fixed to the outer surface of the hopper, the screen can be rotated slightly from the closed position. This relates to a safety device for a hopper with an agitator that detects and shuts off the agitating blade driving circuit, and the detecting part when the screen is rotated is placed outside the hopper to ensure and easily protect the detecting part with an appropriate cover device. The purpose is to provide a safety device that will not malfunction.

To explain in detail the embodiment shown in the figure, 1 is a hopper having an opening 1a at the top, a rotary shaft 3 which is supported through the lower center and has an appropriate number of stirring blades 2, and a motor 4 provided externally. It is provided so as to be rotatable in the direction of the arrow in FIG. Reference numeral 5 denotes a screen, which is formed into a rectangular lattice shape and arranged so as to be able to open upwards with the vicinity of one end as a pivot point, and its tip is supported in a horizontal state by a support base 6 provided in the hopper 1 to keep it in a closed state. .

5a and 5b are short and long rotation shafts that serve as pivot points, respectively, and are integrally fixed to the back surface of the screen.

Reference numeral 1 designates a bearing for supporting the short rotating shaft 5a, which can be fixed from the outside of the hopper 1 with appropriate screws, etc., and reference numeral 8 designates a rubber ring which serves as a seal and also serves to prevent the shaft 5a from moving in the axial direction.

Reference numeral 9 denotes a rubber ring having the same purpose as the rubber ring 8, and 10 denotes a cover, through which the rotating shaft 5b is inserted into a hole provided in the inner refracting plate 10a, and can be screwed to the outer surface of the hopper 1 as appropriate on the outside. When it is fixed at 1, only the bottom is open.

Reference numeral 11 denotes a seal support ring, into which the seal 12 is fitted, and which is fitted onto the end of the long rotation shaft 5b.

A cam 13 is connected and fitted on the outside of the seal support ring 11, and is fixed to the elongated rotation shaft 5b with appropriate screws.

The screen 5 has a bearing 7 and a rubber ring 8 on the short rotation shaft 5a side, and a rubber ring 9, a cover 10, a seal 12, a seal support ring 11, and a cam 13 on the long rotation shaft 5b side.
With each attached, the side plate of the hopper 1 is held between the cover inner refraction plate 10a and the seal support ring 11, as shown in FIG. , the bearing 7 and the cover 10 are fixed from the outside of the hopper 1 by suitable screws.

Reference numeral 14 designates a limit switch, which is fixed to the bracket opening 5 fixed to the hopper 1, and when engaged with the cam 13, closes the contact at a position where the screen 5 rotates slightly from the closed position, thereby interrupting the driving circuit of the motor 4. It is as follows.

FIG. 5 shows a second embodiment, in which a rotary ring 113 with a light receiving plate 113a is attached to the tip of a long rotary shaft 5b as a rotary member.
is fixed, and a phototube 114 is used as the transmitting member.
is in the closed position, and rotating it to the two-dot chain line position cuts off the operating circuit.

FIG. 6 shows a third embodiment, in which the side plate of the hopper 201 is not provided with the groove 1b as in the first embodiment, and the screen rotation shaft 205a is made of one long material. 2
01 from one side and is fixed to the screen 205 by a split ring 205b provided on the screen 205.

209 is a rubber ring, 210 is a cover and inner refracting plate 21
0a is provided vertically at an appropriate length from the end of the hopper opening 201a.

211 is a seal support ring that also serves as a bearing, and can be screwed to the outer plate of the hopper 201 as appropriate; 212 is a seal;
3 is a cam, 214 is a limit switch, and 215 is a bracket.

Therefore, in this embodiment, the rotating shaft 205a is inserted from the outside of the hopper 201, and the rubber ring 209 and the screen 205 are fitted and fixed inside the hopper 201, and fitted into a bearing (not shown) on the other end. , Seal 21 from the outside
2. After fitting and fixing the bearing/seal support ring 211 and the cam 213, placing a bracket 215 on the outer surface of the hopper 201 and fixing the limit switch 214, the cover 210 is slid in and fixed from above. In the device of the present invention constructed as described above, the rotating member and the transmitting member as the operation stop means are all placed outside and can be completely isolated from the inside of the hopper by a seal and a cover, so that the mortar during stirring can be completely isolated from the inside of the hopper. The mortar does not stick to the operation stop means due to scattering, etc., and can be made into an extremely reliable safety device.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of the device of the present invention, of which Figure 1 is a plan view, and Figures 2 and 3 are A in Figure 1.
-A cross-sectional view and B-B arrow view, Fig. 4 is a C-C cross-sectional view in Fig. 3, and Figs. 5 and 6 are second cross-sectional views showing only the main parts.
and a third example. In the figure, 1 is a hopper, 2 is a stirring blade, 5 is a screen, 6 is a support stand, 10 is a cover, 11 is a seal support ring, 13 is a cam,
14 indicates a limit switch.

Claims (1)

[Scope of Claims] 1. A rotating shaft that passes through the lower part of the hopper with an upward opening is provided with an appropriate stirring blade, and the stirring blade can be opened and rotated upward using a pivot point near one end at a suitable position in the hopper above the stirring blade. A screen is placed in the screen, and at least one of the rotating shafts of the screen is made to protrude outside the hopper, and the screen is brought into a closed state by engaging and disengaging the rotating member provided at the tip with the transmitting member fixed outside the hopper. 1. A safety device for a hopper with an agitation device, characterized in that when the agitation blade rotates slightly, the agitation blade operation circuit is cut off by detecting this. 2. The safety device for a hopper with an agitation device according to claim 1, wherein the rotating member is a cam of an appropriately shaped shape, and the transmitting member is a limit switch. 3. A safety device for a hopper with a stirring device according to claim 1, wherein the rotating member is a light receiving plate of an appropriate size, and the transmitting member is a photoelectric tube. 4. A safety device for a hopper with an agitation device according to claim 1, wherein the upper surfaces of the rotating member and the transmitting member are appropriately covered with a cover.