JPS585222Y2 - Pocket level detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-pocket level detection device that detects the level of a stored object (hereinafter referred to as an object) consisting of a lump, a powder, or a mixture thereof in a pocket.

Conventionally used pocket level detection devices are generally divided into two types: mechanical type and electrode type.

First, as a mechanical type, a steel pipe or chain is suspended from the end of the reduction shaft of a vertical small electric motor, and a blade is fixed to the tip of the chain, as shown in Figure 1 (a), (b), rotary level meter, and the rotation of the motor is transmitted to the blade. When the object in the pocket accumulates during rotation, the point in time when the rotating blade is buried in the object and is about to be restrained is detected, and the detection pole attached to the deceleration main shaft of the motor operates or the load current of the motor is used to detect the upper limit of the accumulation of objects in the pocket. There is a device that detects the level, and the lower limit level is detected by the detection electrode at the point in time when the blade starts to rotate to expose when the object is pulled out of the pocket.

However, in terms of strength, these steel pipes or chains cannot be made long, and the length is at most less than 5 m, making them unsuitable for detecting objects in pockets at the lower limit level.

In particular, it is unsuitable for use with hard and critical materials such as ores, as they are easily damaged.

Next, the electrode type includes the microcurrent type shown in FIG. 2 and the capacitance type shown in FIG.

This can detect objects in the pocket at both the upper and lower limits and at any intermediate level, but since a sand bar is used to insulate the electrodes, malfunctions are likely to occur due to a drop in the insulation of the sand bar due to dust or moisture. Not reliable for use in pockets.

The present invention eliminates the drawbacks of the mechanical and electrical devices mentioned above, is suitable for the lower limit of 5 meters or more, and is not affected by dust or moisture.

The present invention is a device that detects the level of a lump, powder, or a mixture of these objects when it is carried into a pocket, and is equipped with a suspension device with a weight attached to the tip from the upper framework in the pocket. In order to move the suspension device up and down, a mechanism is provided to change the rotational movement of the main shaft of the reduction motor into vertical movement, and the load on the reduction motor is in a state where the weight that moves up and down by the mechanism is buried in the object carried into the pocket. The purpose is to detect the level of the object inside the pocket by detecting the current.

Examples of the present invention are shown in Figure 4 (front view) and Figure 5 (side view).
This is explained by:

The suspension device consists of a rope 2 and a weight 1 at the lower end of the rope, and if necessary, a metal fitting 13 for hanging the rope is provided at the upper end of the rope 2.

The upper end of the rope 2 is ring-shaped and the pocket upper framework 1
It is connected with play to a rope hanging fitting 13 from a shackle 14 attached to 5.

A weight 1 is fixed to the lower end of the rope, but since the weight is not very bulky, for example, a short steel pipe slightly larger than the rope diameter is inserted into the rope, external pressure is applied, and the rope (preferably a crimped one) is inserted into the rope. be.

On the other hand, the main shaft 10 of a small reduction motor 12 is installed in the pocket upper framework 15 as a mechanism for converting rotational motion into vertical motion.
The ball bearing 7 is fitted onto a bearing support bolt 9 attached to one location on the outer surface of the flange 11 fitted to the flange 11, and the ball bearing 7 is covered from the outer surface with a bearing cover 6 having a bolt hole drilled in the center. , the bearing cover fixing nut 8 is screwed into the head of the bearing support bolt 9 protruding from the center of the bearing cover 6, and the bearing cover 6 is fixed to the outer ring of the ball bearing 7.

A spring hanging metal fitting 5 is welded to the outer periphery of the bearing cover 6, and the upper end of the spring 4 is attached to it, and the lower end of the spring is fixed to the ring-shaped play part of the upper end of the rope 2. .

However, in the movement of the device of the present invention having the above-mentioned structure, when the small reduction motor 12 starts rotating, the bearing support bolt 9 supporting the ball bearing 7 rotates around the main shaft of the small reduction gear.

The weight of a rope 2, a weight 1, and a spring 4 are applied to the lower part of the bearing cover 6 via a spring hanging metal fitting 5.
The bearing support bolt 9 smoothly repeats the vertical movement of the length equal to the rotational diameter of the rotational movement.

The amplitude of the vertical movement, that is, the rotational diameter of the rotational movement is optimally between 3Q mm and 50 m1n, and a flanch for the main shaft of the small reduction gear motor with a diameter that is suitable for this may be adopted.

The tension of the spring leg 4 is set to be equal to or slightly weaker than the rotational force of the small reduction motor 12, and when the object in the pocket suddenly falls due to some unknown reason while the ronib is rising, a large pulling force is applied to the rope 2. Even if this happens, the main shaft of the motor will not be subject to any large force, just because the spunong 4 is extended.

This means that the force that is pulled down more than during the vertical movement of the o-nib 2 is supported by the pocket upper frame 15 via the rope plate 2, the rope suspension fitting 13, and the shackle 14, which is more than necessary for a small reduction motor. No force is applied.

Note that instead of the spring 4 described above, it is also possible to use an elastic body 4 such as a rubber rope or a rubber membrane.

Next, FIG. 6 shows an example in which the present invention is used in a pocket.

The length of the rope 2 is selected depending on a certain height at which it is desired to detect whether objects have accumulated up to a certain height in the pocket 16, and a suspension device that moves up and down is provided.

When the level of the object in the pocket rises and the weight 1 becomes buried in the object, the small reduction motor detects an overload and stops as described above.

This shows that the objects in the pocket have accumulated to the set level.

In addition, in this invention, when the object level falls and the weight changes from a buried state to a released state, such as by pulling out an object from a pocket, the small reduction gear motor becomes able to operate under the normal load and starts operating, and the suspension device resumes its up-and-down motion, indicating that the object level in the pocket is below the position of the weight.

Another example of the use of the present invention in a pocket is to provide a suspension device with a predetermined length of rope 2, for example three weights 1, attached to the upper framework of the pocket, so that the upper limit ( It is known whether the object is above or below the respective level (the pocket is near full), the lower limit (the pocket is empty), and any intermediate levels.

In addition, using the signal detected by this invention, pocket 1
It is also possible to control operations such as starting and stopping of the belt conveyor 17 that carries objects into the pocket 6, the feeder 18 that extracts objects from pockets, the drawer conveyor 19, and the like.

The conditions for the vertically moving weight 1 to be buried in the stored object are the type and amount of the stored object carried into the pocket, and the vertical movement of the suspension device relative to this. Although it depends on the magnitude of the amplitude, the length of the period, etc., in the present invention, it is achieved under the condition that the weight 1 is buried in the storage object, and thereby a sufficient and reliable effect can be obtained.

The electrical method for detecting the level of an object in a pocket will be described in detail as follows.

FIG. 7 is an embodiment of a relay wiring diagram of the pocket level detection device.

When AC 100V is supplied to the circuit shown in FIG. 7, this circuit starts operating.

Due to the operation of relay R1, timer T1 operates relay R2 after the set time (contact R2 is activated at the same time as relay R2 is activated).
b), relay R1 becomes inoperable), and contact R21a operates magnetic switch M for the small reduction motor to put the small reduction motor in the operating state, that is, wire rope 2
Starts the monitoring state in which the robot moves up and down.

Timer T2 that prevents instantaneous operation if the weight 1 is not buried in an object and is not restrained when the magnet switch M operates.
Relay R3 operates after the set time.

When the weight 1 is buried and restrained by an object, the wire rope 2 is restrained, the small reduction motor 12 is overloaded, and the overcurrent relay OC is activated, and the relay R3 is disconnected.

On the other hand, relay R1 is operated by contact R3lb, and timer T
After the set time of 1, the magnet switch 0 circuit is checked by contact R21a.

Thereafter, the small reduction motor 12 rotates until the object comes to the level of the weight 1 again, and continues monitoring the pocket level.

T3 is a compensation timer for the starting current of the small speed reduction motor, and T4 is a compensation timer for power-on of this circuit.

It goes without saying that the output of the small reduction motor used can be changed appropriately depending on the size and specific gravity of the object in the pocket, and if the two sets for the upper limit and lower limit are used together, both the upper and lower limit levels can be adjusted. can be detected.

Of course, it may also be used to detect an intermediate level between the upper and lower limit levels.

As described above, according to the present invention, the suspension device can be
It detects the level of the object inside the pocket at m or more, and in terms of strength, it is stronger than the conventional mechanical type and will not be damaged.

In addition, the force from the suspension device is not applied directly to the reduction motor, and can be perceived as a smooth change in load current.

In addition, like the conventional electrode type, there is no dust in the pocket.
There is no possibility of malfunction of level detection due to deterioration of the insulation of the insulator due to moisture.

[Brief explanation of drawings]

Figure 1 is a rotary level meter, Figure 2 is a microcurrent level meter,
FIG. 3 shows a capacitive level meter, FIG. 4 is a front view of the pocket level detection device, and FIG. 5 is a side view thereof. FIG. 6 shows an example in which the present invention is used in a pocket, and FIG. 7 is a wiring diagram of the relay board of the pocket level detection device. 1... Weight, 2... Rope, 3...
...Clamp, 4...Spring, 5...
...Spring hanging metal fittings, 6...Bearing cover, 7...Bearing, 8...
・Bearing cover fixing nut, 9...Bearing support bolt, 10...Small reduction motor main shaft, 11...Small reduction motor main shaft clamp,
12... Small reduction motor, 13... Rope hanging fitting, 14... Shackle, 15
... Pocket upper framework, 16 ... Pocket, 17 ... Belt conveyor, 18 ...
...Feeder, 19...Drawer belt conveyor, R□...Relay, T1...Timer, R2...Relay, M...・Magnetic switch for small reduction motor, T2 instantaneous operation prevention timer R3...Relay, T3...Starting current compensation timer OC...Overcurrent relay, Ll
...Full release indicator light, R2...Full indicator light, T4...Compensation timer at power-on, Rtla
etc...A contact, Rz b etc...B contact.

Claims (2)

[Scope of utility model registration request] (1) In a device for detecting the level of a stored object consisting of lumps, powder, or a mixture thereof in a pocket,
A suspension device with a weight 1 attached to the tip of the upper framework 15 of the pocket is provided, and in order to move the suspension device up and down, a mechanism is provided to change the rotational movement of the main shaft of the reduction motor 12 into vertical movement. An in-pocket level detection device detects the level of the stored object in the pocket by detecting the state in which the moving weight 1 is buried in the stored object carried into the pocket 16 as a load current of the deceleration motor 12. (2) The pocket level detection device according to claim 1, wherein the main shaft of the reduction motor 12 is connected to a suspension device via the elastic body 4.