JP2020132378A - Chain type conveyor device and its operation method - Google Patents

Abstract

To provide a chain type conveyor device capable of reducing noise of conveyor operation changing depending on a conveyance load condition of a chain type conveyor, and its operation method.SOLUTION: A chain type conveyor device contains a duct 1 having a supply port 22 of particulate matter 12 on one end and a discharge port 24 on the other end, a drive sprocket 30 and a driven sprocket 32 arranged in a duct, a conveyor chain 2 bridged between the drive sprocket and the driven sprocket for circulating movement, and a conveyance plate 3 which is extended from both side surfaces of the conveyor chain in a direction crossing to a conveyance direction to push out the particulate matter in the duct in the conveyance direction with circulating movement of the conveyor chain, and comprises a weighing part 50 for measuring a conveyance amount of the particulate matter supplied from supply means 14 connected to the supply port, and a control part which controls so that, when a measurement value of the weighing part is larger than a setting conveyance load, speed is made faster than setting speed of a drive motor, and, when equal to or smaller than the setting conveyance load, the speed is made to the low speed equal to or lower than the setting speed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a chain type conveyor device capable of continuously transporting powders and granules such as coal, gypsum, wood flour, and grains, and an operation method thereof.

There is a chain type conveyor as a device for transporting powdered coal, gypsum, wood flour, grains, etc. in an almost horizontal direction. This chain type conveyor accepts powders and granules to be transported into the space of a duct having a square cross section formed long in the transport direction and transports and moves them in the duct space (for example, disclosed in Patent Documents 1 and 2). ..
3A and 3B are explanatory views of a conventional chain type conveyor device, where (1) is a partially enlarged plan view, (2) is a partially enlarged side view, and (3) is a partially enlarged front view. A conveyor chain 2 is attached to the bottom surface of the duct 1, and a conveyor plate 3 that pushes powder or granular material in the transport direction is attached to the left and right sides of the conveyor chain 2, and the conveyor chain 2 is connected endlessly in the longitudinal direction of the duct 1 space. The powder or granular material is received from one side and discharged to the other destination (see FIG. 3 (1)).
As the discharge portion, a structure is generally adopted in which an opening is provided at the bottom of the space and the powder or granular material scraped by the conveyor chain 2 and the transport plate 3 is dropped.
At this time, the transport amount per unit time is determined by the filling amount of the space for transporting the powder or granular material. When the filling amount is large (the transport load is large), the powder particles are transported while sliding on the inner wall of the square cross section, and the conveyor chain 2 and the transport plate 3 are freed by the reaction force and its own weight in the moving direction of the powder particles. The conveyor chain 2 is conveyed and moved in the pulling direction without any movement.

Since the inside of the duct is filled with powder or granular material, the sliding noise of the conveyor chain 2 and the inner wall of the space is insulated. Furthermore, the vibration of the inner wall of the space (suppressing the movement of the inner wall) is also suppressed by the force pushing the inner wall of the transported object, so the influence of noise and vibration is small.
However, when the filling amount in the transport space is reduced (the transport load (hereinafter, may be simply referred to as a load) is small), the sliding noise of the side surface of the rail attached to the conveyor chain 2 and the bottom of the inner wall is absorbed by the filling. The adverse effect of noise becomes apparent without being suppressed. When the internal space increases, the sliding sound generated inside is further amplified by the effect of the resonance box.
For example, when the chain roller is worn due to movement and the roller height dimension is reduced, the link plate and the conveyor plate 3 of the conveyor chain 2 come into contact with each other inside, and the chance of noise generation increases (see FIG. 3 (2)). Further, when the amount of transportation is reduced, it becomes difficult for the powder or granular material charged into the duct 1 to fall evenly on the left and right sides of the conveyor chain 2, and the powder or granular material is biased to either the left or right side, resulting in an unbalanced load. (See FIG. 3 (3)).
As a result, the conveyor chain 2 meanders, and the link plate of the conveyor chain 2 and the side surface of the chain rail come into contact with each other to generate a rubbing noise. In a state where the load is small, the inner wall of the duct 1 vibrates, causing a trouble that noise is generated like a resonance box. In addition, the rotational force acting on the conveyor plate 3 causes the link plate and the conveyor plate 3 of the conveyor chain 2 to move in the rotational direction, increasing the chances of contact with the inner wall, which has been a major cause of noise generation.

Japanese Unexamined Patent Publication No. 2003-237924 Japanese Patent No. 5931651

An object to be solved by the present invention is to provide a chain type conveyor device and an operation method thereof that can reduce the noise of conveyor operation that changes depending on the transport load condition of the chain type conveyor in view of the above-mentioned problems of the prior art. ..

According to the present invention, as a first means for solving the above problems, a duct having a powder / granule supply port at one end and a discharge port at the other end, a drive sprocket and a driven sprocket arranged in the duct, and the above-mentioned A conveyor chain that circulates across the drive sprocket and the driven sprocket, and the powder particles in the duct that extend from both sides of the conveyor chain in a direction intersecting the transport direction and circulate in the conveyor chain. In a chain type conveyor device having a transport plate extruded in the transport direction.
A measuring unit that measures the amount of the powder or granular material transported from the supply means connected to the supply port, and
The measuring unit is electrically connected to a drive motor connected to the drive sprocket, and when the measured value of the measuring unit is larger than the set transfer load, the speed is made faster than the set speed of the drive motor, and the set transfer is performed. A control unit that controls the speed to be lower than the set speed when the load is lower than the load.
It is an object of the present invention to provide a chain type conveyor device characterized by the above.
According to the first means, it is possible to effectively prevent noise such as metal rubbing noise generated when the transport load is reduced.

In the present invention, as a second means for solving the above problems, a duct having a powder / granule supply port at one end and a discharge port at the other end, a drive sprocket and a driven sprocket arranged in the duct, and the above-mentioned A conveyor chain that circulates across the drive sprocket and the driven sprocket, and the powder particles in the duct that extend from both sides of the conveyor chain in a direction intersecting the transport direction and circulate in the conveyor chain. In the operation method of the chain type conveyor device having the transport plate extruded in the transport direction,
A step of measuring the amount of the powder or granular material transported from the supply means connected to the supply port, and
When the measured value of the powder or granular material is larger than the set transport load, the speed is faster than the set speed of the drive motor, and when the measured value is less than the set transport load, the speed is controlled to be lower than the set speed.
It is an object of the present invention to provide a method of operating a chain type conveyor device, which comprises the above.
According to the second means, noise such as metal rubbing noise generated when the transport load is reduced can be effectively prevented.

According to the present invention, the load supplied to the conveyor is measured by the upstream equipment, and the conveyor device is controlled to slow down when the load is equal to or less than the set transfer load. This is effective for energy saving, improvement of wear life, noise reduction, and the like.

It is a schematic block diagram of the chain type conveyor device of this invention. It is a graph which shows the relationship between the transport speed and the transport load. It is explanatory drawing of the conventional chain type conveyor device.

An embodiment of the chain type conveyor device and its operation method of the present invention will be described in detail below with reference to the drawings.
[Chain type conveyor device 10]
FIG. 1 is a schematic configuration diagram of the chain type conveyor device of the present invention. As shown in the figure, the chain type conveyor device 10 of the present invention (hereinafter, may be simply referred to as a conveyor device 10) has a duct 1 having a supply port 22 for powder particles 12 at one end and a discharge port 24 at the other end, and the duct. The drive sprocket 30 and the driven sprocket 32 arranged in 1 and the conveyor chain 2 that circulates and moves across the drive sprocket 30 and the driven sprocket 32, and extends from both side surfaces of the conveyor chain 2 in a direction intersecting the transport direction. A transport plate 3 that pushes the powder particles 12 in the duct 1 in the transport direction, and a measuring unit 50 that measures the transport amount of the powder particles 12 supplied from the supply means 14 connected to the supply port 22. When the measuring unit 50 is electrically connected to the drive motor 31 connected to the drive sprocket 30 and the measured value of the measuring unit 50 is larger than the set transfer load, the speed is higher than the set speed of the drive motor 31. It is provided with a control unit 60 that controls the speed to be faster and lower than the set transport load when the speed is lower than the set transport load.

The measuring unit 50 measures the amount of the powder or granular material 12 supplied from the supply means 14 such as the conveyor, hopper, and chute connected to the supply port 22. The supply means 14 of the present embodiment is a conveyor, a hopper, a chute, a bucket, a wheel loader, or the like, which is input from a ship, a vehicle, a freight car, or the like. The load due to the powder or granular material supplied from such a transport facility to the conveyor device 10 is not constant but fluctuates. The transport amount of the present embodiment is regarded as the load of the powder and granules to be transported to the conveyor device 10 (convey load), and the transport load is large when the transport amount is large and the transport load is small when the transport amount is small.

The control unit 60 is electrically connected to the measuring unit 50 and the drive motor 31 connected to the drive sprocket 30. The control unit 60 controls the rotation speed of the drive motor 31 (the transport speed of the conveyor chain 2) based on the transport amount which is the measured value of the measuring unit 50, in other words, the transport load. More specific control of the control unit is the meandering of uneven load on the left and right sides of the conveyor plate that occurs when the amount of input to the conveyor chain 2 is small, in other words, the amount of transfer is small, and the metal that contacts the side wall of the duct 1. Control to slow down the transfer speed to the drive motor 31 so that the link plate fixing the transfer plate is lifted by the rubbing noise and the reaction force tilting to the transfer plate and does not come into local contact with the bottom surface to generate metal rubbing noise. Send a signal.
FIG. 2 is a graph showing the relationship between the transport speed and the transport load. As an example, the control signal has a set transport load (A in FIG. 2) and a set transport speed B at this time set in advance, and when the measured value is larger than the set transport load A, the set transport speed (A) Transport faster than B) in FIG. For example, the transport speed is set to increase in proportion to the increase in the transport load. In addition, it may be conveyed at an arbitrary constant speed faster than the set speed. Then, when the measured value is equal to or less than the set transfer load, the speed is set to be lower than the set transfer speed.

[Operation method of chain type conveyor device 10]
The operation method of the chain type conveyor device of the present invention having the above configuration will be described below.
As shown in FIG. 1, the conveyor device 10 of the present embodiment is installed and used in a storage silo that stores coal or biomass as fuel in a power plant or the like. Coal and biomass fuel (for example, wood flour, wood pellets, etc.) are transported by ship, vehicle, freight car, etc. from various places and accepted by the hopper. This delivery is not continuous, but once it is received in a yard or a large container, it is mixed for the purpose of adjusting the water content and calorific value of coal and biomass fuel, which have different physical properties depending on the production area. After this adjustment, it is stored in a storage silo by the conveyor device 10 and transported to a fuel-using facility (power plant, heat utilization factory, etc.) in the subsequent stage. At this time, the coal and biomass fuel are weighed and discharged from the storage silos, respectively, and blended to be used as fuel so as to meet the calorific value required by the fuel-using equipment.
Conventionally, in a general operation method of a conveyor device, in order to keep the amount of transportation constant, the transportation speed is set high when the amount of goods to be transported is small.
Fuel is received into the storage silo during the daytime, as the type of transportation means, the amount of fuel, and the time of delivery are not constant. Storage silos must be stocked above a certain level so that fuel users will not run out of supply. The conveyor device of the present embodiment is a conveyor that conveys powder or granular material from the yard to the storage silo, and can be stopped at night due to noise problems. However, since power plants and the like must supply the conveyors continuously, the conveyor device between the yard and the silo is operated continuously. In this case, since nighttime is also assumed, operation control is required so as not to generate noise.

The measuring unit 50 measures the amount of powder or granular material transported from the yard. The measured value is sent to the control unit 60. The control unit 60 performs the following transport control according to the transport load.
The set transfer load A and the set transfer speed B at this time are determined in advance. At this time, no noise such as rubbing noise is generated regardless of the presence or absence of powder or granular material.
When the measured value of the transport amount is larger than the set transport load A, the transport is carried out faster than the set transport speed B. For example, the transport speed is set to increase in proportion to the increase in the transport load. In addition, it may be conveyed at an arbitrary constant speed faster than the set speed.
Then, when the amount of powder or granular material is small and the set transport load A or less is small, the speed is controlled to be lower than the set transport speed.
This makes it possible to reduce the noise of conveyor operation generated by the change in the transport load of the conveyor chain 2. For example, when the amount of transport is small, the left and right loads of the transport plate 3 become non-uniform and meander easily, and the side wall of the duct 1 comes into contact with metal to generate a metal rubbing noise, but this noise can be avoided.
Further, when the transport amount is reduced, a reaction force that tilts the transport plate 3 acts to lift the link plate fixing the transport plate 3. Then, the link plate and the transport plate 3 locally contact the bottom surface with metal to generate a metal rubbing noise, but the transport plate 3 does not tilt and the link plate does not lift even if the transport amount is small.
Therefore, the amount of sliding wear of each part can be reduced, and the maintenance frequency and aging deterioration can be reduced. In addition, noise generation can be reduced. Further, the power consumption of the drive motor can be reduced, and the energy saving of the entire device can be achieved.
Further, since the torque for driving the conveyor chain is increased and the tension is also increased by controlling the transfer speed at a low speed when the transfer load is equal to or less than the set transfer load, meandering can be avoided and noise such as rubbing noise is not generated.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, and can be implemented by various combinations.

The chain type conveyor device and its operation method of the present invention have industrial applicability, especially in the storage and transportation equipment for powders such as coal, gypsum, wood flour, and grains.

1 Duct 2 Conveyor chain 3 Conveyor plate 10 Chain type conveyor device 22 Supply port 24 Discharge port 30 Drive sprocket 31 Drive motor 32 Driven sprocket 50 Weighing unit 60 Control unit

Claims (2)

A duct having a powder and granule supply port at one end and a discharge port at the other end, a drive sprocket and a driven sprocket arranged in the duct, a conveyor chain that circulates across the drive sprocket and the driven sprocket, and the conveyor. In a chain type conveyor device having a transport plate extending from both side surfaces of the chain in a direction intersecting the transport direction and extruding the powders and granules in the duct in the transport direction as the conveyor chain circulates.
A measuring unit that measures the amount of the powder or granular material transported from the supply means connected to the supply port, and
The measuring unit is electrically connected to a drive motor connected to the drive sprocket, and when the measured value of the measuring unit is larger than the set transfer load, the speed is made faster than the set speed of the drive motor, and the set transfer is performed. A control unit that controls the speed to be lower than the set speed when the load is lower than the load.
A chain type conveyor device characterized by being equipped with. A duct having a powder and granule supply port at one end and a discharge port at the other end, a drive sprocket and a driven sprocket arranged in the duct, a conveyor chain that circulates across the drive sprocket and the driven sprocket, and the conveyor. A method of operating a chain type conveyor device having a transport plate extending from both side surfaces of the chain in a direction intersecting the transport direction and extruding the powder particles in the duct in the transport direction as the conveyor chain circulates. In
A step of measuring the amount of the powder or granular material transported from the supply means connected to the supply port, and
When the measured value of the powder or granular material is larger than the set transport load, the speed is faster than the set speed of the drive motor, and when the measured value is less than the set transport load, the speed is controlled to be lower than the set speed.
A method of operating a chain-type conveyor device, which comprises.

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