JP3130174U - Hopper scale dust control equipment - Google Patents

Abstract

An object of the present invention is to prevent floating dust from adhering to and accumulating on the outer surface of a discharge chute or a supply chute.
In a hopper scale, an air blowing device for blowing down floating dust Pa generated when a powder P is discharged from a discharge chute 12 of a weighing hopper 1 (or a supply chute 21 of a supply device 2). 3 (or 4).
[Selection] Figure 2

Description

  The present invention relates to a hopper scale for measuring a granular material containing fine powder called a loose load, particularly in the vicinity of a discharge chute of the measuring hopper and a supply chute for supplying the granular material in the measuring hopper. It is related with the dust control apparatus of the hopper scale for preventing the dust isolate | separated from the granular material from adhering to (or removing the dust adhering temporarily).

  FIG. 5 shows a general hopper scale for measuring powder particles. The hopper scale shown in FIG. 5 is configured to remove a predetermined amount of powder particles P from the supply chute 21 of the supply device 2 by the cut gate 22. It cuts out one by one and is sequentially supplied into the weighing hopper 1, the powder P in the weighing hopper 1 is weighed by each load cell 16, 16, and discharged when the weight of the powder in the weighing hopper 1 reaches a predetermined amount. The discharge gate 13 of the chute 12 is opened so that the granular material P in the weighing hopper 1 is dropped and accommodated in a receiver (for example, a storage bag) Y.

  By the way, in the granular material P to be weighed, fine powder is contained, and when the granular material P is dropped and discharged from the supply chute 21 of the supply device 2, the discharge chute 12 of the weighing hopper 1, etc., The fine powder floats in the air as dust Pa. In the supply chute 21 portion, dust Pa floating in the air adheres to the outer surface near the outlet of the supply chute 21 and the outer surface near the supply port 11 of the weighing hopper 1, while in the discharge chute 12 portion of the weighing hopper 1. The dust Pa floating in the air comes to adhere to the outer surface near the outlet of the discharge chute 12. In this way, the dust Pa adhering to the outer surface near the outlet of the supply chute 21 (and the outer surface near the outlet 11 of the weighing hopper 1) and the outer surface near the outlet of the discharge chute 12 is gradually increased with the passage of days. Accumulate.

  However, in the case where dust Pa adheres and accumulates on the outer surface near the outlet of the supply chute 21 and the discharge chute 12 as described above, it is necessary to periodically stop the operation to remove the adhering dust. There is a problem that the loss due to the above occurs and the removal work of the adhering dust is troublesome.

  On the other hand, if the dust adheres to the outer surface of the supply chute, the outer surface of the discharge chute, etc., dust and germs in the air may be mixed into the adhering dust, May contain impurities. Further, in the case where the dust Pa in the granular material P to be treated deteriorates with the passage of days, if the dust Pa adheres to the outer surface of the supply chute, the outer surface of the discharge chute, etc. as described above, the dust Pa deteriorates with the passage of days. And, if dust mixed with impurities or deteriorated dust adhering to the outer surface of the supply chute or the discharge chute is peeled off during operation, the peeled dust may be mixed into normal (clean) granular material. In that case, there is a problem that a defective product is mixed in the product without noticing.

  Therefore, the present invention prevents (or temporarily adheres) dust in the granular material from adhering to the outer surface of the supply chute, discharge chute, etc. when measuring the granular material using a hopper scale. The present invention has been made for the purpose of providing a dust control device for removing dust).

  The present invention has the following configuration as means for solving the above problems. The present invention is directed to a dust control device in a hopper scale that handles powder particles.

Invention of Claim 1 of the Present Application The hopper scale used in the invention of claim 1 of the present application is mainly used for measuring a predetermined amount of a granular material (for example, feed) called a bulk load. The hopper scale used in this device measures the granular material supplied into the weighing hopper, then discharges the measured granular material from the discharge chute of the weighing hopper, and places it below the receiving hopper scale. It is stored in a container (for example, a storage bag).

  By the way, when the granular material falls from the discharge chute, a part of the dust (fine powder) in the granular material comes to float in the air near the outlet of the discharge chute.

  In the dust control apparatus according to claim 1 of the present application, when the granular material is discharged from the discharge chute, the dust separated from the granular material in the vicinity of the outlet of the discharge chute adheres to the outer surface near the outlet of the discharge chute. The dust control device according to the first aspect of the present invention is configured to prevent the dust separated from the granular material in the vicinity of the outlet of the discharge chute downward. It is equipped with an air blowing device for blowing it away.

  As this air blowing device, a plurality of (for example, 10 to 14) air nozzles are arranged around the discharge chute of the weighing hopper, and air from an air source (compressor) is supplied to each air nozzle. Can be adopted. Each air nozzle is directed so that air is blown downward in the vicinity of the outer peripheral surface near the outlet of the discharge chute. The air supply to each air nozzle may be performed by operating a solenoid valve by providing a solenoid valve in the middle of the air supply pipe.

  The dust control apparatus according to claim 1 of the present application can blow air downward from each air nozzle of the air blowing device during operation or at the end of operation.

  In addition, when operating an air blowing apparatus during a driving | operation, air can be blown off from each air nozzle in synchronization with discharge | emission of the measured granular material in a measurement hopper from a discharge chute. In this way, when the operation of the air blowing device is synchronized with the discharge of the granular material from the discharge chute, the dust separated from the discharged granular material and suspended in the air is lowered by the blown air from each air nozzle ( The dust suspended in the air is not attached to the outer surface near the outlet of the discharge chute.

  In addition, when the air blower is operated only at the end of operation (at the time of lunch break or at the end of a day's work, etc.), part of the floating dust generated during operation temporarily adheres to the outer surface near the discharge chute outlet. However, the amount of adhering dust is generated in a short time of about half a day or one day, so it is relatively small. By operating the air blowing device, the adhering dust can be easily blown off. Can do.

Invention of claim 2 of the present application The hopper scale used in the invention of claim 2 of the present application is provided with a supply chute for supplying powder particles in the weighing hopper, and the powder particles supplied from the supply chute to the measurement hopper are measured. After that, it is configured to discharge from the discharge chute of the weighing hopper. In the hopper scale used in the invention of claim 2 of the present application, when the granular material falls from the supply chute, a part of the dust in the granular material is near the outlet of the supply chute (near the supply port of the weighing hopper) ) To float in the air.

  In the dust control device according to claim 2 of the present application, when the granular material is discharged from the supply chute, the dust separated from the granular material in the vicinity of the outlet of the supply chute adheres to the outer surface near the outlet of the supply chute. The dust control device of this second device is for blowing down dust floating in the vicinity of the outlet of the supply chute to prevent the dust from adhering (or to remove dust adhering temporarily). An air blowing device is provided.

  The air blowing device according to claim 2 also has a plurality (for example, 6 to 8) of air nozzles arranged around the supply chute so that air from an air source (compressor) is supplied to each air nozzle. Can be used. Each air nozzle is directed so that air is blown downward at a position near the outer peripheral surface near the outlet of the supply chute. In this case as well, the air supply to each air nozzle may be performed by operating an electromagnetic valve by providing an electromagnetic valve in the middle of the air supply pipe.

  And the dust control apparatus of this invention of Claim 2 can blow off air downward from each air nozzle of the air blowing device during operation or at the end of operation as in the case of Claim 1 above. The floating dust generated near the outlet of the supply chute is prevented from adhering to the outer surface of the supply chute, or the temporarily adhering dust can be easily blown off.

  Of course, the dust control device (for supply device) according to claim 2 can be used in combination with the dust control device (for discharge device of the weighing hopper) according to claim 1.

  Thus, the hopper scale dust control device according to each claim of the present application is configured to blow out dust generated when discharging particulates from the discharge chute of the weighing hopper, the supply chute to the weighing hopper, etc. from the air blowing device. Since the air can be forcibly blown downward, the floating dust can be prevented from adhering to the outer surface near the outlet of the discharge chute and the supply chute, or the temporarily adhering dust can be easily removed.

  Accordingly, in each device of the present application, dust hardly adheres to the outer surface of the discharge chute and the supply chute, so that it is not necessary to remove the adhered dust that was necessary in the past, and it is not necessary to stop the operation for the dust removal work. There is an effect of becoming (no loss of time). In addition, since dust does not adhere to the outer surface of the discharge chute and the supply chute, there is an effect that generation of deteriorated dust or contamination of impurities (dust or bacteria) due to passage of days can be prevented.

  A hopper scale dust control apparatus according to an embodiment of the present invention will be described with reference to FIGS. In addition, the hopper scale used in this embodiment is mainly used for measuring a granular material (for example, a feed) called a bulk load, and in the granular material to be processed, a specific gravity of Light fine powder (dust) is mixed.

  As shown in FIGS. 1 and 2, the hopper scale includes a weighing hopper 1 and a supply device 2 that supplies powder particles into the weighing hopper 1.

  The weighing hopper 1 measures the weight of the granular material P (FIG. 3) supplied into the hopper main body 10 with the load cell 16 (four in total).

  The hopper body 10 is provided with a powder supply port 11 at the top and a discharge chute 12 at the bottom. The lower end opening of the discharge chute 12 is opened and closed by a discharge gate 13. The discharge gate 13 is opened and closed by an air cylinder 14.

  At the upper part of the weighing hopper 1, there is provided a supply device 2 for cutting out and supplying the granular material P (FIG. 4) into the hopper body 10 by a predetermined small amount. In the supply device 2, a supply chute 21 is provided in the cover body 20, and a lower end opening of the supply chute 21 is opened and closed by a discharge gate 22. The discharge gate 22 is opened and closed by an air cylinder 23. Note that the lower end opening of the supply chute 21 is provided at a position immediately above the supply port 11 of the hopper body 10.

  In the vicinity of the hopper scale, a dust suction device 5 is installed as shown in FIG. The dust suction device 5 includes an air duct 51 that is opened near the outlet of the discharge chute 12, a dust collector 52 that separates and absorbs dust from the dust-mixed air that passes through the air duct 51, and a suction blower. 53.

  The hopper scale of this embodiment functions as follows. A receiver (for example, a storage bag) Y is installed below the discharge chute 12 of the hopper body 10. When the operation is started, the discharge gate 13 of the weighing hopper 1 is closed, and the discharge gate 22 of the supply device 2 repeatedly opens and closes sequentially as shown in FIG. P is sequentially supplied into the hopper body 10 through the supply port 11 of the hopper body 10 in a predetermined small amount. When a predetermined amount of the granular material P is supplied into the hopper body 10, the discharge gate 13 is shown by a chain line in FIG. 3 based on a measurement expiration signal from a controller (not shown) based on a measurement signal from the load cell 16. The opening operation is performed as shown (reference numeral 13 '), and the granular material P in the hopper main body 10 is dropped and discharged from the lower end opening of the discharge chute 12 into the receiver Y, and one weighing operation is completed. Thereafter, the receiver Y is replaced and the weighing operation is sequentially performed in the same manner.

  By the way, as shown in FIG. 3, when the granular material P falls from the discharge chute 12 of the hopper body 10, a part of the dust in the granular material P is near the outlet of the discharge chute 12 as indicated by symbol Pa. Will float in the air. Also, as shown in FIG. 4, when the granular material P falls from the supply chute 21 of the supply device 2, the outlet of the supply chute 21 so that a part of the dust in the granular material P is indicated by the symbol Pa. It floats in the air in the vicinity. The dust Pa floating near the outlets of the discharge chute 12 and the supply chute 21 adheres to the outer surfaces (including the discharge gates 13 and 22) near the outlets of the discharge chute 12 and the supply chute 21 as they are, and the number of days has elapsed. It accumulates sequentially with this. When the dust Pa adheres to and accumulates on the outer surfaces of the discharge chute 12 and the supply chute 21 as described above, various problems as described in the above “Problems” section arise.

  Therefore, in this embodiment, a dust control device is provided on the hopper scale so that the floating dust Pa does not adhere to the vicinity of the outer surfaces of the discharge chute 12 of the weighing hopper 1 and the supply chute 21 of the supply device 2. In this embodiment, dust control devices are respectively installed in the discharge chute 12 portion of the weighing hopper 1 and the supply chute 21 portion of the supply device 2. In the following description, the dust control device on the weighing hopper 1 side is referred to as a first dust control device, and the dust control device on the supply device 2 side is referred to as a second dust control device.

  As shown in FIG. 3, the first dust control device is for blowing down dust Pa (FIG. 3) generated near the outlet of the discharge chute 12, and this first dust control device is shown in FIG. An air blowing device 3 shown in FIG. 2 is provided.

  A plurality of air blowing devices 3 of the first dust control device are provided on each of four surfaces around the discharge chute 12 of the weighing hopper 1 (in the illustrated example, four on the long diameter surface and two on the short diameter surface for a total of 12). Are arranged so that air A is supplied from an air source (compressor) 30 through an air supply pipe 31 to each of the air nozzles 34, 34. In the middle of the air supply pipe 31, a pressure tank 32 and an electromagnetic valve 33 are provided. By opening the electromagnetic valve 33 at a timing described later, high-pressure air in the pressure tank 32 is supplied to each air nozzle 34, It is distributed to 34 ..

  Each air nozzle 34, 34,... Of the first dust control device employs a rod-like flexible tube having an appropriate length (for example, about 40 to 50 cm), and the direction of the nozzle tip can be freely set. It can be adjusted. Each of the air nozzles 34, 34,... Is attached to a mounting base 15 provided on the outer periphery of the hopper body 10 so as to extend downward, and the tip of each nozzle is located near the outlet of the discharge chute 12, respectively. It is arranged in a posture directed to the vicinity of the outer peripheral surface.

  On the other hand, as shown in FIG. 4, the second dust control device is for blowing down dust Pa floating near the outlet of the supply chute 21, and the second dust control device is shown in FIGS. 1 and 2. The air blowing device 4 shown in FIG.

  The air blowing device 4 of the second dust control device is provided with a plurality of air nozzles 44, 44,... On the two opposing surfaces of the supply chute 21 of the supply device 2 (a total of eight in the illustrated example). The air A is supplied from the air source (compressor) 30 through the air supply pipe 41 to each of the air nozzles 44, 44. The air source 30 shares that of the first dust control device. A pressure tank 42 and an electromagnetic valve 43 are provided in the middle of the air supply pipe 41. By opening the electromagnetic valve 43 at a timing described later, high pressure air in the pressure tank 42 is supplied to each air nozzle 44, 44 .... is distributed and blown out.

  Each air nozzle 44, 44,... Of the second dust control device employs a rod-like flexible tube having an appropriate length (for example, about 15 to 20 cm), and the direction of the nozzle tip can be freely set. It can be adjusted. The air nozzles 44, 44,... Extend through the cover body 20 of the supply device 2 to a position close to the opposing outer surface of the supply chute 21, as shown in FIG. The supply chute 21 is arranged in a posture directed to the vicinity of the outer peripheral surface near the outlet.

  And each 1st and 2nd dust control apparatus of this Example functions as follows, respectively. Each of the dust control devices can be operated during operation or after the operation is completed.

  First, in the case of operating during operation, in the first dust control device, the discharge gate 13 of the weighing hopper 1 is opened as shown by a chain line (reference numeral 13 ') in FIG. The electromagnetic valve 33 of the air blowing device 3 is opened. Then, as the powder P in the hopper body 10 falls through the discharge chute 12 (accommodated in the receiver Y), one of the dust in the powder P near the outlet of the discharge chute 12 is obtained. Although the part Pa floats, the air A and A are blown downward from the air nozzles 34, 34... To the vicinity of the outer surface near the outlet of the discharge chute 12, and the floating dust Pa is blown into each blown air. A and A are blown downward. Then, the suspended dust Pa blown downward is accommodated in the receiver Y together with the falling powder P. In the air blowing device 3, the solenoid valve 33 is closed after a predetermined timer (for example, after the discharge gate 13 is closed), and the air blowing from the air nozzles 34, 34,.

  On the other hand, in the second dust control device, the electromagnetic valve 43 of the air blowing device 4 is opened in synchronism with the opening operation of the discharge gate 22 of the supply device 2 as shown by the chain line (reference numeral 22 ') in FIG. Make it work. Then, as the granular material P in the supply chute 21 falls (supplied into the hopper main body 10 from the supply port 11 of the hopper main body 10), the dust in the granular material P near the outlet of the supply chute 21. The air Pa is blown downward from the air nozzles 44, 44... Toward the outer surface near the outlet of the supply chute 21 in synchronism therewith. Blowing air A, A will blow off downward. The suspended dust Pa blown down is accommodated in the hopper body 10 from the supply port 11 of the hopper body 10 together with the falling powder body P. In the air blowing device 4, the electromagnetic valve 43 is closed after a predetermined timer (for example, after the discharge gate 22 is closed), and the air blowing from the air nozzles 44, 44,.

  In addition, when each dust control device is operated only after the operation is finished, it is considered that a small amount of dust Pa temporarily adheres to each outer surface of the discharge chute 12 or the supply chute 21, but each dust control device (air By operating the blowing devices 3 and 4), the dust Pa adhering to the outer surfaces of the discharge chute 12 and the supply chute 21 can be easily blown off.

  In the hopper scale with a dust control device of this embodiment, the first dust control device can prevent floating dust from adhering to the vicinity of the outer surface of the discharge chute 12, and the second dust control device can supply the supply chute 21. As a result, it is possible to prevent airborne dust from adhering to the outer surface of the product, so that it is not necessary to remove the adhering dust as in the past, and the dust does not remain attached for a long time. Even if it mixes with regular granular material P, it does not become inferior goods.

It is a front view of a hopper scale with a dust control device of an example of the present application. It is a left view of FIG. It is the III-III expanded sectional view of FIG. It is IV-IV expanded sectional drawing of FIG. It is the schematic of the conventional common hopper scale.

Explanation of symbols

  1 is a weighing hopper, 2 is a supply device, 3 is an air blowing device, 4 is an air blowing device, 10 is a hopper body, 11 is a supply port, 12 is a discharge chute, 21 is a supply chute, 30 is an air source, and 31 is air A supply pipe, 33 is an electromagnetic valve, 34 is an air nozzle, 41 is an air supply pipe, 43 is an electromagnetic valve, 44 is an air nozzle, P is a granular material, and Pa is floating dust.

Claims (2)

After weighing the granular material (P) supplied into the weighing hopper (1), the measured granular material (P) is discharged from the discharge chute (12) of the weighing hopper (1). In the hopper scale,
Air for blowing down dust (Pa) separated from the powder (P) in the vicinity of the outlet of the discharge chute (12) when the powder (P) is discharged from the discharge chute (12) Equipped with a blowing device (3),
A hopper-scale dust control device characterized by that. A supply chute (21) for supplying the granular material (P) is provided in the weighing hopper (1), and the granular material (P) supplied from the supply chute (21) into the weighing hopper (1) is weighed. Later, in a hopper scale configured to discharge from the discharge chute (12) of the weighing hopper (1),
Air for blowing down dust (Pa) separated from the powder (P) in the vicinity of the outlet of the supply chute (21) when the powder (P) is supplied from the supply chute (21) Equipped with a blowing device (4),
A hopper-scale dust control device characterized by that.

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