JPS582142B2 - Solid material supply control device into the storage tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the supply of solids into a storage tank.

In order to control the supply of solids into the storage tank, it is necessary to detect the level of solids in the storage tank.

In conventional level detection devices, a weight is attached to one end of a rope, the other end of the rope is wrapped around a drum, and the weight is lowered into a storage tank until the weight reaches the upper surface of the solid matter in the storage tank. The rope tension decreases when this point is reached, which is detected, and the solids level is detected based on the amount of rope lowering during this time.

Once the level detection is completed, the weight is hoisted up and left above the storage tank for the required time, and the weight is lowered again in the same way to detect the level and measure changes in level. .

However, since this is an intermittent detection device that detects the level at required time intervals, it cannot follow rapid changes in the solids level, and the solids in the residual tank reach a certain level and become solid. Even if it becomes necessary to supply solid matter, there is a problem in that the continuous operation of supplying solid matter cannot be carried out accurately and quickly in order to detect the level.

This invention was made in view of the above circumstances, and
An object of the present invention is to provide a control device for supplying solids into a storage tank, which can continuously detect the level of solids in the storage tank and accurately supply solids based on the detected level. .

A detailed explanation will be given below with reference to the drawings.

In FIG. 1, the storage tank 1 has a rectangular cylindrical shape with a rectangular cross section at the lower part, and is located on the right side of the upper part, with one side wall 1a slanting upward and outward.

A solid material S is loaded into the storage tank 1, which is picked up by a packet 2a of a crane (solid material supply device 2) placed above the storage tank 1.

A storage chamber 11 for the weight vehicle 4 is provided at the upper end of the inclined wall 1a, and a pulley 10 is provided here, and a rope 3 is hung on this.

In addition, the heavy vehicle 4 is pulled up into the storage room 11.
A limit switch 12 for detecting the upper limit of winding is provided to detect when the upper limit of the winding is within the range.

A weight wheel 4 on an inclined wall 1a is attached to one end of the rope 3, and the other end of the rope 3 is wound around a winding drum 5 disposed below or to the side of the storage tank 1.

The weight vehicle 4 has a contact plate 4a at the front, which is in contact with a part of the upper surface of the solid material S in the storage tank 1.

Further, the weighted vehicle 4 is equipped with wheels so that it can be moved on the inclined wall 1a by its own weight.

The winding drum 5 is equipped with a winding motor 6, a brake 7, a torque motor 8, and a rotation amount detector 9.

The hoisting motor 6 rotates the hoisting drum 5 to pull up the weight wheel 4 along the inclined wall 1a.

The brake 7 applies a braking force to the rotating shaft of the winding drum 5 in order to temporarily stop the weighted car 4 that has been pulled up and placed in the storage chamber 11.

The torque moke 8 has the function of allowing the weight car 4 to fall naturally due to its own weight without hoisting it up, and giving a reverse rotational torque to the winding drum 5 so that a tension to the extent that the rope 3 does not loosen is applied to the rope 3.

Here, the reverse rotation torque refers to a torque that rotates the winding drum 5 in the opposite direction, with the direction in which the winding drum 5 rotates due to the weight of the weight wheel 4 being lowered as normal rotation.

The output shafts of the hoisting motor 6 and torque motor 8 are connected to the winding drum 5.
is connected to the rotating shaft.

The rotation amount detector 9 is a so-called rotation transducer that outputs the rotation amount of the winding drum in the positive direction, that is, the rotation angle or the rotation speed, as a digital or analog signal.

FIG. 2 is a block diagram of the control circuit of each of the above devices.

In this figure, the same parts as in FIG. 1 are given the same reference numerals.

Since the forward rotation amount of the winding drum 5 corresponds to the height position of the weight car 4, the output of the rotation amount detector 9 can be used as a level sign A indicating the level of the solids S in the storage tank 1. .

This signal A is sent to the display device 13 and the recording device 14, and is output as visible information and is also recorded on recording paper or the like.

Furthermore, level signal A is sent to comparator 15.

The comparator 15 is preset with a lower limit level L at which solids should be supplied when the level reaches that level, and when the level signal A matches this lower limit level L, the detection signal B is set.
is output.

This detection. The signal B is input to the flip-flop 16 as a set signal, and is also sent to the solid material feeder 2 as a feed preparation signal C.

The supply device 2 includes the above-mentioned crane, the packet 2a, and its control device, and in response to the preparation signal C, the packet 2a grabs solids piled up elsewhere, for example, and transports them to above the storage tank 1.

Then, when the storage signal D from the limit switch 12 is input as the supply permission signal E, the bucket 2a is opened and the solids are thrown into the storage tank 1.

If necessary, repeat this loading operation multiple times. When the supply operation is completed, a supply end signal F is output.

This signal F is sent to flip-flop 16 as a reset signal.

On the other hand, the output of the flip-flop 16 and the inverted signal of the storage signal D are sent to the AND circuit 17, and the winding motor 6 is driven based on the output of the AND circuit 17.

Furthermore, the output of the flip-flop 16 is connected to the NOT circuit 18.
The signal is inputted to one input terminal of the OR circuit 19 through the .

The output of the AND circuit 17 is sent to the other input terminal of the OR circuit 19, and based on the output of the OR circuit 19, the braking of the brake machine 7 is released.

It is now assumed that the level of solid matter S in the storage tank 1 is higher than the lower limit level L, as shown in FIG.

The weight vehicle 4 keeps the contact plate 4a in constant contact with a part of the upper surface of the solid material S, and as the level of the solid material S decreases, it rolls on the inclined wall 1a due to its own weight and descends.

As the weight car 4 descends, the rope 3 wound around the winding drum 5 is sequentially unwound.

At this time, the reverse rotation torque of the torque motor 8 applies tension to the rope 3 to the extent that it does not loosen.

Therefore, the rope 3 is reeled back by the distance that the weight car 4 has descended, and the output of the rotation amount detector 9 accurately indicates the solids level.

When the solid matter level reaches the lower limit level L, the comparator 15 outputs a detection signal B, the flip-flop 16 is set, and the supply device 2 prepares to supply the solid matter.

On the other hand, since the weight vehicle 4 is near the lower limit level L, the limit switch 12 in the storage chamber 11 is off, and the storage signal D has not been output yet.

Therefore, flip-flop 16 also has logic signal "1".
However, the limit switch 12 outputs the inverted signal “1” of “0”.
” is input to the AND circuit 17, so the AND circuit 17
A signal "1" is output from the hoisting motor 6, the hoisting motor 6 starts rotating, and the weight car 4 is pulled up toward the storage chamber 11.

When the weight vehicle 4 is stored in the storage chamber 11, the limit switch 12 is turned on, so the storage signal D (logic "1") is turned on.
is output, the output of the AND circuit 17 becomes "0", and the motor 6 stops.

At the same time, supply of the plowed solids to the storage tank 1 is started in response to the supply permission signal E.

By the way, the output of the flip-flop 16 is "1", therefore the output of the NOT circuit 18 is "0", and on the other hand, when the motor 6 is driving, the output of the AND circuit 17 is "1". The output of the OR circuit 19 is "1", and at this time the braking of the brake machine 7 is released.

Then, when the output of the AND circuit 17 becomes "0" and the motor 6 stops, the output of the OR circuit 19 becomes "0" and the brake 7 is driven to move the lifted weighted vehicle 4 into the storage room.
Stop within 1.

When the supply of solids is completed and the end signal F (logic "1") is output, the flip-flop 16 is reset, so its output is "0" and the output of the NOT refill 18 is "1".
As a result, the output of the OR circuit 19 becomes "1", and as a result, the braking by the brake machine 7 is released, and the heavy vehicle 4 is caused to move due to its own weight.
The level is lowered to the level of the supplied solids, and the level detection operation is repeated again.

It should also be noted here that when the solid material is supplied, the weight vehicle 4 is pulled up to the upper end of the inclined wall 1a to prevent it from being buried in the solid material and being damaged.

In addition, in the above, a single rope is used to suspend the weight car, but multiple ropes can be attached to the weight car in parallel at required intervals, and the length of the winding drum in the axial direction can be adjusted. If the length is longer than the distance between multiple ropes, or if each rope is equipped with a winding drum and connected by the same rotating shaft, the weight vehicle will always maintain a horizontal state and will not tilt. Therefore, stable and more accurate detection is possible.

Further, one side wall of the storage tank is inclined and the weight car is lowered along this inclined surface, but of course it may be lowered vertically.

In this case wheels would not be necessary.

It is even more preferable to provide a guide in the storage tank to guide the vertical descent of the weight.

This invention provides stability when applied to a storage tank used to continuously feed solids to a processing device when the solids are various types of solid waste including vegetable scraps, glass pieces, etc. As a result of accurate detection, the solid material can be fed without interruption, which is extremely suitable.

Of course, the present invention can be applied to various other solid materials.

As explained in detail above, in this invention, the weight is suspended from one end and the other end is placed in contact with the solid material in the storage tank while ensuring that the rope wrapped around the drum does not loosen. Since the level of solids is detected by the amount of descent, the level of solids can be detected continuously and accurately.

From this point on, solids can be accurately supplied when the solids level in the storage tank reaches a predetermined lower limit level.

Moreover, since the weight is pulled up to its storage position when the solid material is supplied, burying in the solid material and damage thereof are prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the invention, and FIG. 2 is a block diagram showing its control circuit. 1...Storage tank, 2...Solid supply device, 3...Rope,
4... Weight car (weight), 5... Winding drum, 6... Winding motor, 7... Brake, 8... Torque motor, 9... Rotation amount detector, 12... For detecting upper limit of winding 16...Flip-flop, 17...AND circuit, 1
8...NOT circuit, 19...OR circuit, S...solid object.

Claims (1)

[Scope of Claims] 1. A weight attached to one end of the rope, a winding drum around which the other end of the rope is wound, and a winding drum that allows the weight to descend under its own weight and exerts enough tension on the rope to prevent the rope from loosening. A torque generator that keeps the weight always in contact with the upper surface of the solid object by applying a reverse rotation torque to A hoisting upper limit detector that detects the dead weight, a feeding device that supplies solids to storage tank C, a level detector that detects the level of solids in the storage tank based on the amount of forward rotation of the winding drum, and a solids level. A comparator that detects that the current level matches a predetermined lower limit level and outputs a lower limit detection signal, a hoist control circuit that operates the hoist to raise the weight based on the lower limit detection signal, and a hoist upper limit detection A supply control device for controlling the supply of solids into a storage tank, comprising: a supply control circuit that starts supplying solids by a supply device in response to a signal;