JP7419657B2 - Chain conveyor device and its operating method - Google Patents

Description

The present invention relates to a chain-type conveyor device that can continuously convey granular materials such as coal, gypsum, wood flour, and grains, and a method of operating the same.

A chain conveyor is a device that transports granular materials such as coal, gypsum, wood flour, and grain in a nearly horizontal direction. This chain-type conveyor receives powder and granular material, which is a conveyed object, into the space of a duct with a rectangular cross section that is formed long in the conveyance direction, and conveys and moves it within the duct space (for example, disclosed in Patent Documents 1 and 2). .
FIG. 3 is an explanatory diagram of a conventional chain conveyor device, in which (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 of the duct 1, and conveyor plates 3 that push the powder and granules in the conveying direction are attached to the left and right sides of the conveyor chain 2, and the conveyor chains 2 are connected endlessly to the longitudinal direction of the duct 1 space. Powder is received from one side and discharged to the other destination (see Fig. 3 (1)).
The discharge section generally has a structure in which an opening is provided at the bottom of the space and the powder and granules scraped together by the conveyor chain 2 and the conveyor plate 3 are dropped.
At this time, the amount of conveyance per unit time is determined by the amount of filling of the space in which the granular material is conveyed. When the amount of filling is large (the conveyance load is large), the powder and granules are conveyed while sliding on the inner wall of the square cross section, and the conveyor chain 2 and conveyance plate 3 are freed by the reaction force in the direction of movement of the powder and their own weight. The conveyor chain 2 is conveyed and moved in the tensile direction without any movement.

Since the inside of the duct is filled with powder, the sliding noise between 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) can be suppressed by the force of pushing the inner wall of the transported object, so the influence of noise and vibration is small.
However, when the amount of filling in the conveyance space decreases (the conveyance load (hereinafter simply referred to as load) is small), the sliding noise of the conveyor chain 2 and the side of the rail attached to the bottom of the inner wall is absorbed by the filling. The negative effects of noise become apparent without being suppressed. When the internal space increases, the sliding noise generated inside is further amplified by the effect of the resonance box.
For example, when the chain rollers are worn due to movement and the height of the rollers becomes smaller, the link plates of the conveyor chain 2 and the conveyance plate 3 come into contact with each other internally, increasing the chance of noise generation (see FIG. 3 (2)). Furthermore, when the amount of conveyance decreases, it becomes difficult for the powder and granules introduced into the duct 1 to fall evenly on the left and right sides of the conveyor chain 2, resulting in an unbalanced load. (See Figure 3 (3)).
As a result, the conveyor chain 2 meanderes, and the link plates of the conveyor chain 2 come into contact with the side surfaces of the chain rails, producing a rubbing noise. When the load is low, the inner wall of the duct 1 vibrates, causing a problem in which noise is generated like a resonance box. In addition, due to the rotational force acting on the conveyor plate 3, the link plates of the conveyor chain 2 and the conveyor plate 3 move in the rotational direction, increasing the chances of contact with the inner wall, which is a main cause of noise generation.

JP2003-237924A Patent No. 5931651

The problem to be solved by the present invention is to provide a chain-type conveyor device and its operating method that can reduce the noise of the conveyor operation, which changes depending on the conveyance load condition of the chain-type conveyor, in view of the above-mentioned problems of the prior art. .

As a first means for solving the above problems, the present invention provides a duct having a powder supply port at one end and a discharge port at the other end, a driving sprocket and a driven sprocket disposed in the duct, and a driving sprocket and a driven sprocket arranged in the duct. A conveyor chain that circulates around a driving sprocket and a driven sprocket, and a conveyor chain that is fixed to both sides of link plates of the conveyor chain and extends in a direction intersecting the conveyance direction and that is attached to the inside of the duct as the conveyor chain circulates. a conveyor plate that pushes out the powder or granular material in the conveyance direction,
a measuring unit that measures the conveyance amount of the powder and granular material supplied from the supply means connected to the supply port;
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 a set conveyance load, the speed is set higher than the set speed of the drive motor, and the set conveyance is increased. a control unit that controls the speed to be lower than the set speed when the load is lower than the set speed;
An object of the present invention is to provide a chain-type conveyor device characterized by comprising:
According to the first means, it is possible to effectively prevent noise such as metal scraping noise that occurs when the conveyance load is reduced.

As a second means for solving the above problems, the present invention provides a duct having a powder supply port at one end and a discharge port at the other end, a driving sprocket and a driven sprocket disposed in the duct, and a driving sprocket and a driven sprocket arranged in the duct. A conveyor chain that circulates across a driving sprocket and a driven sprocket, and a conveyor chain that is fixed to both sides of link plates of the conveyor chain and extends in a direction intersecting the conveyance direction and that is attached to the inside of the duct as the conveyor chain circulates. A method for operating a chain conveyor device, comprising: a conveyor plate that pushes out the powder or granular material in a conveyance direction;
a step of measuring the conveyance amount of the powder and granular material supplied from the supply means connected to the supply port;
When the measured value of the powder or granular material is larger than the set transport load, the speed is set higher than the set speed of the drive motor connected to the drive sprocket , and when it is lower than the set transport load, the speed is controlled to be lower than the set speed. process and
An object of the present invention is to provide a method of operating a chain type conveyor device, which is characterized by having the following.
According to the second means, it is possible to effectively prevent noise such as metal scraping noise that occurs when the conveyance load decreases.

According to the present invention, the load supplied to the conveyor is measured by the upstream equipment, and the conveyance speed of the conveyor device is controlled to be slowed when the load is equal to or less than the set conveyance load. This is effective in saving energy, improving wear life, reducing noise, etc.

1 is a schematic configuration diagram of a chain conveyor device of the present invention. It is a graph showing the relationship between conveyance speed and conveyance load. FIG. 2 is an explanatory diagram of a conventional chain conveyor device.

Embodiments of the chain type conveyor device and its operating method of the present invention will be described in detail below with reference to the drawings.
[Chain conveyor device 10]
FIG. 1 is a schematic configuration diagram of a chain conveyor device of the present invention. As shown in the figure, a chain type conveyor device 10 (hereinafter simply referred to as conveyor device 10) of the present invention includes a duct 1 having a supply port 22 for powder and granular material 12 at one end and a discharge port 24 at the other end. a driving sprocket 30 and a driven sprocket 32 disposed within the conveyor chain 1; a conveyor chain 2 that circulates across the driving sprocket 30 and the driven sprocket 32; and a conveyor chain 2 extending from both sides of the conveyor chain 2 in a direction intersecting the conveyance direction. a conveyor plate 3 that pushes out the powder or granular material 12 in the duct 1 in the conveyance direction; and a measuring section 50 that measures the conveyance amount of the powder or granular material 12 supplied from the supply means 14 connected to the supply port 22. , the measuring section 50 is electrically connected to the driving motor 31 connected to the driving sprocket 30, so that when the measured value of the measuring section 50 is larger than the set conveyance load, the speed is lower than the set speed of the driving motor 31. and a control unit 60 that performs control to increase the speed and reduce the speed to below the set speed when the transport load is below the set conveyance load.

The measuring unit 50 measures the conveyance amount of the powder or granular material 12 supplied from the supply means 14 such as a conveyor, hopper, or chute connected to the supply port 22 . The supply means 14 of this embodiment is conveyance equipment such as a conveyor, hopper, chute, bucket, or wheel loader that is fed from a ship, vehicle, freight car, or the like. The load caused by the powder and granular material supplied from such conveyance equipment to the conveyor device 10 is not constant but fluctuates. The amount of conveyance in this embodiment is regarded as the load (conveyance load) of the transported powder or granular material on the conveyor device 10, and when the amount of conveyance is large, the conveyance load is large, and when the amount of conveyance is small, the conveyance load is small.

The control section 60 is electrically connected to the measuring section 50 and the drive motor 31 that is connected to the drive sprocket 30 . The control unit 60 controls the rotational speed of the drive motor 31 (the conveyance speed of the conveyor chain 2) based on the conveyance amount, which is the measured value of the measuring unit 50, in other words, the conveyance load. More specifically, the control unit controls the meandering of the conveyor plate with uneven loads on the left and right sides that occur when the amount of input to the conveyor chain 2 is small, in other words, when the amount of conveyance is small, and the metal contact with the side wall of the duct 1. Control is applied to the drive motor 31 to slow down the conveyance speed to prevent scraping noises and metal scraping noises caused by the reaction force acting on the conveyor plate that causes the link plate fixing the conveyor plate to lift up and make local contact with the bottom surface of the conveyor plate. send a signal.
FIG. 2 is a graph showing the relationship between conveyance speed and conveyance load. As an example, the control signal is such that a set conveyance load (A in FIG. 2) and a set conveyance speed B at this time are set in advance, and when the measured value is larger than the set conveyance load A, the set conveyance speed ( It is transported faster than B) in FIG. For example, the conveyance speed is set to increase in proportion to the increase in conveyance load. In addition, it may be conveyed at any constant speed faster than the set speed. When the measured value is less than or equal to the set conveyance load, the conveyance speed is set to be lower than or equal to the set conveyance speed.

[How to operate chain conveyor device 10]
A method of operating the chain conveyor device of the present invention having the above configuration will be described below.
As shown in FIG. 1, the conveyor device 10 of this embodiment is used by being installed in a storage silo that stores fuel coal or biomass in a power plant or the like. Coal and biomass fuels (e.g., wood flour, wood pellets, etc.) are transported by ships, vehicles, and freight cars from all over the country and are received in hoppers. This delivery is not continuous, but is once received in a yard or large container, where it is mixed for the purpose of adjusting the moisture content and calorific value of coal and biomass fuel, which have different physical properties depending on the production area. After this adjustment, the fuel is stored in a storage silo by the conveyor device 10 and transported to subsequent fuel-using equipment (power plant, heat utilization factory, etc.). At this time, the coal and biomass fuel are discharged from the storage silos in a metered amount to match the amount of heat required by the fuel-using equipment, and are blended and used as fuel.
Conventionally, in a common method of operating a conveyor device, in order to keep the amount of conveyance constant, the conveyance speed is set to be high when there are few objects to be conveyed.
Fuel is received into the storage silo depending on the type of transportation means, the amount of fuel delivered, and the time of delivery, and is usually carried out during the day. Storage silos must be stocked with a certain amount of fuel so that the fuel will not run out of supply. The conveyor device of this embodiment is a conveyor that transports powder and granular materials from a yard to a storage silo, and can be stopped at night due to noise problems. However, in power plants and the like, where continuous supply is required, the conveyor equipment between the yard and the silo is operated continuously. In this case, since nighttime is also assumed, operation control is required to prevent noise generation.

A measuring section 50 measures the conveyed amount of powder and granular material supplied from the yard. The measured value is sent to the control section 60. The control unit 60 performs the following transport control according to the transport load.
The set transport load A and the set transport speed B at this time are determined in advance. At this time, noise such as rubbing noise is not generated regardless of the presence or absence of powder or granules.
When the measured value of the conveyance amount is larger than the set conveyance load A, the conveyance is carried out faster than the set conveyance speed B. For example, the conveyance speed is set to increase in proportion to the increase in conveyance load. In addition, it may be conveyed at any constant speed faster than the set speed.
Then, when the amount of powder and granular material decreases and the conveyance load is less than the set conveyance load A, control is performed to reduce the conveyance speed to a lower value than the set conveyance speed.
This makes it possible to reduce the noise caused by conveyor operation caused by changes in the conveyance load of the conveyor chain 2. For example, when the amount of conveyance decreases, the load on the left and right sides of the conveyance plate 3 becomes uneven and it tends to meander, causing metal to come into contact with the side wall of the duct 1 and causing metal scraping noise, but this noise can be avoided.
Furthermore, when the conveyance amount decreases, a reaction force that causes the conveyance plate 3 to tilt acts, and the link plate fixing the conveyance plate 3 is lifted up. Although the link plate and the conveying plate 3 locally come into metal contact with the bottom surface and a metal scraping sound is generated, the conveying plate 3 does not tilt even if the amount of conveyance decreases, and the link plate does not lift up.
Therefore, the amount of sliding wear of each part can be reduced, and maintenance frequency and aging deterioration can be reduced. Also, noise generation can be reduced. Furthermore, the power consumption of the drive motor can be reduced, resulting in energy savings for the entire device.
In addition, by controlling the conveyance speed at a low speed when the conveyance load is below the set conveyance load, the torque of the conveyor chain drive increases and the tension increases, so meandering can be avoided and noise such as scraping noise will not be generated.

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

The chain-type conveyor device and its operating method of the present invention have industrial applicability, particularly in storage and transportation facilities for granular materials such as coal, gypsum, wood flour, and grains.

1 Duct 2 Conveyor chain 3 Conveying plate 10 Chain conveyor device 22 Supply port 24 Discharge port 30 Drive sprocket 31 Drive motor 32 Followed sprocket 50 Measuring section 60 Control section

Claims (2)

a duct having a supply port for powder and granular material at one end and a discharge port at the other end; a driving sprocket and a driven sprocket arranged in the duct; a conveyor chain that circulates across the driving sprocket and the driven sprocket; and the conveyor chain. a conveyance plate fixed to both sides of a link plate of the chain and extending in a direction intersecting the conveyance direction to push out the powder and granular material in the duct in the conveyance direction as the conveyor chain circulates; In type conveyor equipment,
a measuring unit that measures the conveyance amount of the powder and granular material supplied from the supply means connected to the supply port;
The measuring unit is electrically connected to a drive motor connected to the driving sprocket, and when the measured value of the measuring unit is larger than a set conveyance load, the speed is set higher than the set speed of the drive motor, and the set conveyance is increased. a control unit that controls the speed to be lower than the set speed when the load is lower than the set speed;
A chain conveyor device characterized by being equipped with. a duct having a supply port for powder and granular material at one end and a discharge port at the other end; a driving sprocket and a driven sprocket arranged in the duct; a conveyor chain that circulates across the driving sprocket and the driven sprocket; and the conveyor chain. a conveyance plate fixed to both sides of a link plate of the chain and extending in a direction intersecting the conveyance direction to push out the powder and granular material in the duct in the conveyance direction as the conveyor chain circulates; In the method of operating a type conveyor device,
a step of measuring the conveyance amount of the powder and granular material supplied from the supply means connected to the supply port;
When the measured value of the powder or granular material is larger than the set transport load, the speed is set higher than the set speed of the drive motor connected to the drive sprocket , and when it is lower than the set transport load, the speed is controlled to be lower than the set speed. process and
1. A method of operating a chain conveyor device, comprising:

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