JP6947391B2 - Weighing device, powder transport device, and weighing method - Google Patents

Description

The present invention relates to a powder / granular material measuring device, a powder / granular material transporting device, and a powder / granular material measuring method.

Conventionally, a measuring device for measuring a predetermined amount of powder or granular material such as a resin pellet has been known. The weighing device is used, for example, to weigh each material such as a resin pellet, a pulverized material, a masterbatch, and an additive to be supplied to a molding machine for producing a resin molded product. A conventional weighing device is disclosed in, for example, Patent Document 1. In the measuring device described in Patent Document 1, the powder or granular material temporarily stored in the raw material hopper is supplied to the measuring hopper, and the powder or granular material is weighed in the measuring hopper. Then, the powder or granular material of a desired weight measured by the measuring hopper is discharged to a supply destination such as a mixer or a molding machine. Such weighing and discharging are repeated.

Japanese Patent No. 5809855

In such a measuring device, there is a problem that the powder or granular material remains inside the raw material hopper that temporarily stores the powder or granular material to be supplied to the measuring hopper after the supply of the powder or granular material to the supply destination is completed. rice field. When the powder or granular material remains inside the raw material hopper, it becomes necessary to discharge the powder or granular material from the raw material hopper. In addition, the powder or granular material may have to be discarded. Therefore, in such a case, labor and waste occur.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique capable of suppressing the amount of powder or granular material remaining in each part of the measuring device in the measuring device for powder or granular material.

In order to solve the above problems, the first invention of the present application is a measuring device for measuring a powder or granular material, a first material storage unit for temporarily storing the powder or granular material, and the powder temporarily. A second material storage unit for storing the granular material, a transportation means for transporting the powder or granular material from the material supply source to the first material storage unit, and a transportation means for transporting the powder or granular material material from the first material storage unit to the second material storage unit. The control unit has a supply means for supplying the powder or granular material, a measuring means for measuring the powder or granular material stored in the second material storage unit, and a control unit for controlling each unit. Is a mass signal acquisition unit to which a mass signal is input from the measuring means, an operation control unit for controlling the operation of the transport means and the supply means, a command signal acquisition unit to which a command signal is input from the outside, and the above. The operation control unit includes the remaining required supply amount calculation unit that calculates the remaining required supply amount to the second material storage unit based on the command signal, and the operation control unit fills the transportation means with the first material storage unit. A transportation step of transporting the powder or granular material from the material supply source, and a supply step of causing the supply means to supply a predetermined amount of the powder or granular material from the first material storage unit to the second material storage unit. , the repetition is executed, if the controller determines that the remaining required supply amount is equal to or less than the maximum storage amount of the first material reservoir, wherein the operation control unit is the transport process is stopped in the vehicle , The supply process by the supply means is performed a required number of times .
The second invention of the present application is the measuring device of the first invention, and the control unit determines whether or not the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit in the supply step. This is performed after the completion and before the start of the transportation process.
The third invention of the present application is the measuring device of the first invention, and the control unit determines whether or not the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit in the supply step. After the end, before the start of the transportation process and during the period of the supply process, the control unit performs the remaining required supply amount during the period of the supply process, and the remaining required supply amount is the maximum storage amount of the first material storage unit. When it is determined that the following is determined, the operation control unit interrupts the supply process, causes the transportation means to perform the transportation process only once, and then stops the transportation process in the transportation means, thereby causing the supply means. The above-mentioned supply process is performed as many times as necessary.

The fourth invention of the present application is the measuring device according to any one of the first invention to the third invention , and the first material storage unit is the maximum storage of the powder and granule material stored in the first material storage unit. The control unit includes a sensor for detecting the height or mass of time, and the control unit stores the first material based on the raw material level acquisition unit into which the level signal from the sensor is input, the mass signal, and the level signal. It also has a charge amount calculation unit that calculates the maximum storage amount of the unit.

The fifth invention of the present application is the measuring device according to any one of the first invention to the fourth invention, and has a plurality of the first material storage portions.

The sixth invention of the present invention is the measuring device of the fifth invention, which is a stirring device arranged below the second material storage unit and agitating the powder or granular material material discharged from the second material storage unit. Have more.

The seventh invention of the present application includes a measuring device according to any one of the first to sixth inventions, a transport pipe for suction transportation for transporting the powder or granular material material discharged from the measuring device to a transport destination, and the like. It is a powder or granular material transport device having an air flow generator for generating an air flow from the measuring device to the transport destination inside the transport pipe.

According to the eighth invention of the present application, in a measuring device for measuring a powder and granule material, the powder and granule material temporarily stored in the first material storage unit is transported to the second material storage unit, and the second material storage unit is stored. It is a measuring method in which the powder / granule material is weighed a plurality of times in a unit, a) a step of transporting the powder / granule material from a material supply source to the first material storage unit, and b) the first. While supplying the powder / granule material from the material storage unit to the second material storage unit, the powder / granule material supplied to the second material storage unit is weighed, and a predetermined amount of the powder / granule material is used. includes a step of supplying the second material reservoir, wherein the step a) and said step b) repeatedly while the the steps of the command signal from c) externally input, d) in accordance with the command signal, It has a step of calculating the remaining required supply amount for the second material storage unit and a step of determining whether or not the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit. , The steps a) and b) are repeatedly executed, and while the steps a) and b) are repeatedly executed, the steps c), d) and e) are executed. When it is determined in the step e) that the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit, the step a) is stopped and the step b) is performed a required number of times. ..
The ninth invention of the present application is the measuring method of the eighth invention, and the step e) is executed after the completion of the step b) and before the start of the step a).
The tenth invention of the present application is the measuring method of the eighth invention, and the step e) is executed after the end of the step b) and before the start of the step a), and the step b). If it is determined that the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit during the period of the step b), the step b) is interrupted. The step a) is executed only once, then the step a) is stopped, and the step b) is executed a required number of times.

The eleventh invention of the present application is the measuring method according to any one of the eighth invention to the tenth invention, and the step a) is a maximum storage amount in the first material storage section before a1) the step b). By the step of transporting the powder and granule material and a2) the step b), the transportation of the powder and granule material to the first material storage portion is stopped until the first material storage portion is emptied. A step of calculating the maximum charge amount of the first material storage unit when the first material storage unit is emptied after the step and a3) the step a2), and a4) the step of the step a3). Later, the step of transporting the powder / granule material to the first material storage unit again is included .

The twelfth invention of the present application is the measuring method according to any one of the eighth invention to the eleventh invention , wherein the measuring device has a plurality of the first material storage portions, and the plurality of the first material storage portions. , The steps a) to e) are carried out, respectively.

The thirteenth invention of the present application is the measuring method of the twelfth invention, in which f) the step of stirring the powder or granular material material supplied from and measured from the plurality of first material storage portions in the step b). Further has.

According to the first to thirteenth inventions of the present application, the amount of powder or granular material remaining in each part of the measuring device can be suppressed.

In particular, according to the fourth invention and the eleventh invention of the present application, the maximum charge amount of the first material storage unit can be calculated while performing the weighing step.

It is the schematic of the powder or granular material transport system which concerns on one Embodiment. It is a block diagram which shows the electrical structure of the powder or granular material transport system which concerns on one Embodiment. It is a flowchart which shows the flow of the weighing process which concerns on one Embodiment. It is a flowchart which shows the flow of the initial transportation process which concerns on one Embodiment. It is a flowchart which shows the flow of the measurement process of the 1st material which concerns on one Embodiment. It is a block diagram which shows the electric structure of the measuring apparatus which concerns on one modification. It is a flowchart which shows the flow of the weighing process of the 1st material which concerns on one modification. It is a flowchart which shows the flow of the weighing process of the 1st material which concerns on other modification. It is a flowchart which shows a part of the flow of the weighing process of the 1st material which concerns on other modification. It is a flowchart which shows the flow of the weighing process of the 1st material which concerns on other modification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. Powder / granular material transportation system according to one embodiment>
<1-1. Configuration of powder and granular material transportation system>
FIG. 1 is a schematic view of a powder or granular material transport system 1 according to an embodiment of the present invention. The powder or granular material transport system 1 includes a material supply unit 2, an air flow generation unit 3, a measuring unit 4, a stirring device 5, a transport unit 6, a powder or granular material transport destination 7, and a control unit 10. In the powder or granular material transport system 1 of the present embodiment, the powder or granular material material supplied from the material supply unit 2 is weighed by the measuring unit 4, the measured powder or granular material is stirred by the stirring device 5, and then the powder or granular material is stirred. It is vigorously transported to the powder / granular material transport destination 7.

The material supply unit 2 has a first material supply unit 21 and a second material supply unit 22. The first material supply unit 21 supplies the resin pellets, which are the main material, to the measurement hopper 41 described later in the measurement unit 4. The second material supply unit 22 supplies additives such as a masterbatch to the measurement hopper 41 of the measurement unit 4. Hereinafter, the powder or granular material material supplied by the first material supply unit 21 is referred to as a first material, and the powder or granular material material supplied by the second material supply unit 22 is referred to as a second material.

The first material supply unit 21 includes a first material supply source 211, a first raw material hopper 212, a first supply pipe 213, and a screw feeder 214. The first material is stored in the first material supply source 211. The first raw material hopper 212 is a first material storage unit in which the first material supplied from the first material supply source 211 is temporarily stored. A first level sensor 215 for detecting whether or not the first material has reached a predetermined height is provided above the first raw material hopper 212. In the present embodiment, the first level sensor 215 detects whether or not the first raw material hopper 212 is full.

The first supply pipe 213 is a pipe for power transportation that connects the lower end of the first material supply source 211 and the first raw material hopper 212. The screw feeder 214 is a supply means for supplying the first material stored inside the first raw material hopper 212 to the measuring unit 4 while adjusting the supply amount. The operation of the screw feeder 214 is controlled by the control unit 10.

The second material supply unit 22 includes a second material supply source 221, a second raw material hopper 222, a second supply pipe 223, and a screw feeder 224. The second material is stored in the second material supply source 221. The second raw material hopper 222 is a first material storage unit in which the second material supplied from the second material supply source 221 is temporarily stored. A level sensor 225 for detecting whether or not the second material has reached a predetermined height is provided on the upper portion of the second raw material hopper 222. In the present embodiment, the second level sensor 225 detects whether or not the second raw material hopper 222 is full.

The second supply pipe 223 is a pipe for power transportation that connects the lower end portion of the second material supply source 221 and the second raw material hopper 222. The screw feeder 224 is a supply means for supplying the second material stored inside the second raw material hopper 222 to the measuring unit 4 while adjusting the supply amount. The operation of the screw feeder 224 is controlled by the control unit 10.

The supply means 12 for supplying the powder or granular material from the first raw material hopper 212 and the second raw material hopper 222 to the measuring unit 4 is not limited to the screw feeders 214 and 224. The supply means 12 for supplying the powder or granular material from the first raw material hopper 212 or the second raw material hopper 222 to the measuring unit 4 is, for example, an opening / closing lid provided at the bottom of the first raw material hopper 212 or the second raw material hopper 222. It may be an air cylinder or the like that opens and closes.

The airflow generating unit 3 includes a suction blower 31, an exhaust pipe 32, a switching unit 33, a fine powder removing unit 34, and a filter 35. The suction blower 31 is an air flow generator that sucks the gas inside the exhaust pipe 32. The airflow generating unit 3 is not limited to the configuration in which the airflow is generated by the suction blower 31. The airflow generating unit 3 may be configured to generate an airflow by, for example, a vacuum pump or an ejector using compressed air. Further, the airflow generating unit 3 is not limited to the one that generates the airflow by suction, and may be configured to generate the airflow by the pressure feeding method.

The exhaust pipe 32 is an air flow pipe that connects the inside of the first raw material hopper 212, the second raw material hopper 222, and the supply hopper 71 described later with the suction blower 31. The exhaust pipe 32 has a main pipe 321, a first exhaust pipe 322, a second exhaust pipe 323, and a third exhaust pipe 324. The main pipe 321 connects the suction blower 31 and the switching portion 33. The first exhaust pipe 322 connects the inside of the first raw material hopper 212 with the switching portion 33. The second exhaust pipe 323 connects the inside of the second raw material hopper 222 with the switching portion 33. Further, the third exhaust pipe 324 connects the inside of the supply hopper 71 and the switching portion 33.

The switching unit 33 is a flow path switching device that switches the connection state between the main pipe 321 and each exhaust pipe 322 to 324. The switching unit 33 has an exhaust port connected to the main pipe 321 and three intake ports connected to each of the exhaust pipes 322 to 324. The switching unit 33 cuts off the communication between the main pipe 321 and each of the exhaust pipes 322 to 324, or causes the main pipe 321 and any of the exhaust pipes 322 to 324 to communicate with each other in accordance with a command from the control unit 10.

A fine powder removing portion 34 and a filter 35 are interposed in the main pipe 321. As a result, a part of solid components such as fine powder and volatile components contained in the gas flowing into the main pipe 321 from each exhaust pipe 322 to 324 is removed. Therefore, the adhesion of these components to the suction blower 31 is suppressed.

When the suction blower 31 is driven and the switching unit 33 communicates the main pipe 321 and the first exhaust pipe 322, the gas in the first raw material hopper 212 passes through the first exhaust pipe 322, the switching unit 33, and the main pipe 321. Is sucked into the suction blower 31. Then, an air flow is generated from the first material supply source 211 through the first supply pipe 213 into the first raw material hopper 212. As a result, the first material stored in the first material supply source 211 is supplied to the first raw material hopper 212 via the first supply pipe 213. Then, when the control unit 10 drives the screw feeder 214, the first material stored in the first raw material hopper 212 is supplied to the measuring hopper 41.

Further, when the suction blower 31 is driven and the switching unit 33 communicates the main pipe 321 and the second exhaust pipe 323, the gas in the second raw material hopper 222 becomes the second exhaust pipe 323, the switching unit 33, and the main pipe 321. It is sucked into the suction blower 31 through. Then, an air flow is generated from the second material supply source 221 through the second supply pipe 223 into the second raw material hopper 222. As a result, the second material stored in the second material supply source 221 is supplied to the second raw material hopper 222 via the second supply pipe 223. Then, when the control unit 10 drives the screw feeder 224, the second material stored in the second raw material hopper 222 is supplied to the measuring hopper 41.

In the present embodiment, the two types of powder / granular material materials supplied by the two material supply units 21 and 22 are the main material and the additive material, respectively, but the present invention is not limited to this. The two types of powder or granular material may be a resin pellet as a main material and another type of resin pellet for mixing with the main material.

Further, the measuring device 100 of the present invention may measure one kind of powder or granular material, or may measure three or more kinds of powder or granular material. That is, the material supply unit 2 may have another material supply unit in addition to the two material supply units 21 and 22. The other material supply unit supplies, for example, other types of additives, defective molding products, and crushed materials (recycled materials) obtained by crushing sprue, runners, and the like.

The measuring unit 4 has a measuring hopper 41 and a weight sensor 42. The measuring hopper 41 is a second material storage unit that temporarily stores the powder or granular material (first material and second material) supplied from the first material supply unit 21 and the second material supply unit 22. At the lower end of the measuring hopper 41, a discharge port 410 for discharging the powder or granular material in the measuring hopper 41 is provided. The discharge port 410 opens and closes according to a command from the control unit 10 described later.

The weight sensor 42 measures the weight of the measuring hopper 41 and the powder or granular material stored inside the measuring hopper 41. The weight sensor 42 of this embodiment is a load cell. However, the weight sensor 42 may be a weighing device other than the load cell.

In this way, the flow path in the material supply unit 2 and the air flow generation unit 3 allow the powder particles from the material supply sources 211,221 to the first raw material hopper 212 and the second raw material hopper 222, which are the first material storage units. The transportation means 11 for transporting the body material is configured. The screw feeders 214 and 224 are supply means 12 for supplying the powder or granular material from the first raw material hopper 212 and the second raw material hopper 222, which are the first material storage portions, to the measuring hopper 41, which is the second material storage portion, respectively. To configure. Further, the weight sensor 42 constitutes a measuring means for measuring the powder or granular material stored in the measuring hopper 41 which is the second material storage unit.

Then, the first raw material hopper 212 and the second raw material hopper 222 which are the first material storage parts, the measuring hopper 41 which is the second material storage part, the transportation means 11, the supply means 12, and the weight sensor which is the measuring means. The weighing device 100 of the present invention is configured by the 42 and the control unit 10 that controls each unit.

The stirring device 5 is arranged below the measuring unit 4. When the discharge port 410 of the measuring hopper 41 is opened, the powder or granular material material stored in the measuring hopper 41 is discharged into the stirring device 5. The stirring device 5 is provided with a stirring blade 51 that is rotationally driven by a motor (not shown) inside the stirring device 5. When the stirring blade 51 is driven, the first material and the second material supplied from the measuring hopper 41 are stirred and uniformly mixed. Further, a discharge port 52 that can be opened and closed is provided in the lower part of the stirring device 5 in order to discharge the powder or granular material material stored inside.

The transport unit 6 is a portion for transporting the powder or granular material from the stirring device 5 to the powder or granular material transport destination 7. The transport unit 6 has a transport hopper 61 and a transport pipe 62. The transport hopper 61 is arranged below the stirring device 5. When the discharge port 52 of the stirring device 5 is opened, the powder or granular material stored inside the stirring device 5 is discharged into the transport hopper 61.

The transport pipe 62 is a transport pipe for transporting the powder or granular material from the transport hopper 61 to the powder or granular material transport destination 7. One end of the transportation pipe 62 is connected to the lower end of the transportation hopper 61. Further, the other end of the transport pipe 62 is connected to a supply hopper 71, which will be described later, of the powder or granular material transport destination 7.

The powder or granular material transport destination 7 has a supply hopper 71 and a molding machine 72. The supply hopper 71 is a temporary storage unit for supplying the powder or granular material material transported via the transport pipe 62 to the molding machine 72. The molding machine 72 of the present embodiment is an injection molding machine that performs injection molding using the powder or granular material as a material.

With such a configuration, when the suction blower 31 is driven and the switching unit 33 communicates the main pipe 321 and the third exhaust pipe 324, the gas in the supply hopper 71 becomes the third exhaust pipe 324, the switching unit 33, and the main pipe. It is sucked into the suction blower 31 through the pipe 321. Then, the pressure inside the supply hopper 71 is reduced, so that an air flow is generated from the transportation hopper 61 toward the supply hopper 71 via the transportation pipe 62. As a result, the powder or granular material material stored inside the transport hopper 61 is transported to the supply hopper 71 through the transport pipe 62. The powder or granular material material transported to the supply hopper 71 is used in the molding machine 72.

In the present embodiment, the stirring device 5 is arranged on the upstream side of the transport unit 6, that is, on the measuring unit 4 side. However, the stirring device 5 may be arranged on the downstream side of the transport unit 6, that is, on the powder / granular material transport destination 7 side. Further, the apparatus included in the powder or granular material transport destination 7 is not limited to the injection molding machine 72. Instead of the injection molding machine 72, the powder or granular material transport destination 7 is another molding device such as an extrusion molding machine, a blow molding machine or a compression molding machine, or another powder or granular material processing device such as a dryer. May be good.

The control unit 10 controls each unit of the powder or granular material transport system 1. FIG. 2 is a block diagram showing an electrical configuration of a powder or granular material transport system. The control unit 10 includes a computer including a CPU, RAM, ROM, and the like. The control unit 10 may be configured by a microcomputer.

The control unit 10 includes a raw material level acquisition unit 101, a mass signal acquisition unit 102, a command signal acquisition unit 103, an operation control unit 104, and a remaining required supply amount calculation unit 105. Each unit 101 to 105 of the control unit 10 is a function processing unit realized by software by program processing by the CPU.

Level signals are input to the raw material level acquisition unit 101 from the first level sensor 215 and the second level sensor 225. Specifically, when the powder or granular material in the first raw material hopper 212 reaches the height at which the first level sensor 215 is provided, the first level signal S215 indicating that the first raw material hopper 212 is in a full state is the raw material level acquisition unit 101. Is entered in. Further, when the powder or granular material in the second raw material hopper 222 reaches the height at which the second level sensor 225 is provided, a second level signal S224 indicating that the second raw material hopper 222 is in a full state is input to the raw material level acquisition unit 101. NS.

A mass signal S42 corresponding to the total weight of the contents of the weighing hopper 41 and the weighing hopper 41 itself is input to the mass signal acquisition unit 102 from the weight sensor 42. The mass signal acquisition unit 102 obtains the weight Δm of the powder or granular material contained in the measuring hopper 41 based on the mass signal S42 in the state where the inside of the measuring hopper 41 acquired in advance is empty and the current mass signal S42. calculate.

The command signal S72 is input to the command signal acquisition unit 103 from the molding machine 72 outside the weighing device 100. The command signal S72 may not be input from the molding machine 72, but may be input by the operator to the control unit 10. The command signal S72 of the present embodiment is end notice information for notifying the remaining number of times of molding or the weight of the remaining required material until the end of molding in the molding machine 72.

The operation control unit 104 controls the operations of the transportation means 11, the supply means 12, and the stirring device 5. Specifically, the operation control unit 104 includes a suction blower 31 and a switching unit 33 of the airflow generation unit 3, screw feeders 214 and 224 of the supply means 12, discharge ports 410 of the measuring hopper 41, and discharge ports 52. The operation with the stirring device 5 is controlled.

The remaining required supply amount calculation unit 105 calculates the remaining required supply amount Mr to be transported to the powder or granular material transport destination 7 by the end of molding of the molding machine 72 based on the command signal S72 input to the command signal acquisition unit 103. do.

<1-2. Operation in the measuring section>
Next, the weighing operation in the measuring unit 4 will be described with reference to FIGS. 3 to 5. FIG. 3 is a flowchart showing the flow of the weighing process in the measuring unit 4. FIG. 4 is a flowchart showing a detailed flow of the initial transportation process included in the weighing process of FIG. FIG. 5 is a flowchart showing a detailed flow of the measurement process of the first material included in the measurement process of FIG.

In this powder or granular material transport system 1, a predetermined amount of powder or granular material is weighed by the measuring unit 4, and is stirred and mixed by the stirring device 5. After that, the operation of supplying the agitated powder or granular material to the powder or granular material transport destination 7 is repeated. One weighing operation performed by the measuring unit 4 is referred to as "1 batch". In the following, the weight of the powder or granular material to be weighed in one batch is referred to as MB. Further, the ratio of the first material contained in the powder or granular material to be supplied to the powder or granular material transport destination 7 is r1, and the ratio of the second material contained in the powder or granular material to be supplied to the powder or granular material transport destination 7 is r2. do. Further, when the first raw material hopper 212 is full, the weight of the first material stored in the first raw material hopper 212 is the maximum charge amount Q1, and when the second raw material hopper 222 is full, the second raw material hopper 222 is used. The weight of the second material stored therein is referred to as the maximum charge amount Q2. In the present embodiment, both the maximum charge amount Q1 and the maximum charge amount Q2 are known in advance.

When supplying the powder or granular material to the powder or granular material transport destination 7, first, an initial transportation step of supplying the powder or granular material to all the raw material hoppers 212 and 222 is performed (step S100).

As shown in FIG. 4, in the initial transportation step of step S100, the control unit 10 first determines whether or not the first raw material hopper 212 is full (step S101). Specifically, the control unit 10 determines whether or not the first level signal S215 has been input from the first level sensor 215 to the raw material level acquisition unit 101, so that the first material in the first raw material hopper 212 can be pressed. It is determined whether or not the height of the first level sensor 215 has been reached.

If it is determined in step S101 that the first raw material hopper 212 is not full, the operation control unit 104 transports the first material to the first raw material hopper 212 (step S102). Specifically, the operation control unit 104 communicates the main pipe 321 and the first exhaust pipe 322 in the switching unit 33 while driving the suction blower 31. As a result, the first material is transported from the first material supply source 211 into the first raw material hopper 212. Subsequently, the control unit 10 makes the determination in step S101 again.

When the control unit 10 determines in step S101 that the first raw material hopper 212 is full, the process proceeds to step S103. At this time, when the material is being transported to the first raw material hopper 212, the operation control unit 104 cuts off the main pipe 321 and the first exhaust pipe 322 in the switching unit 33 to the first raw material hopper 212. Stop the transportation of the first material.

The transport of the powder or granular material in step S102 may be performed intermittently or continuously. For example, in the case of intermittent operation, the determination in step S101 may be performed each time the main pipe 321 and the first exhaust pipe 322 are communicated with each other for a predetermined time in step S102. Further, in the case of continuous operation, the determination in step S101 may be performed at predetermined intervals while the powder or granular material material is being transported in step S102.

Next, the control unit 10 transports the second material to the second raw material hopper 222 in the same manner as the transport of the first material to the first raw material hopper 212 in steps S101 to S102. The control unit 10 determines whether or not the second raw material hopper 222 is full (step S103). Specifically, the control unit 10 determines whether or not the second level signal S225 has been input from the second level sensor 225 to the raw material level acquisition unit 101, so that the second material in the second raw material hopper 222 is released. It is determined whether or not the height of the second level sensor 225 has been reached.

If it is determined in step S103 that the second raw material hopper 222 is not full, the operation control unit 104 transports the second material to the second raw material hopper 222 (step S104). Specifically, the operation control unit 104 communicates the main pipe 321 and the second exhaust pipe 323 with the switching unit 33 while driving the suction blower 31. As a result, the second material is transported from the second material supply source 221 into the second raw material hopper 222. Subsequently, the control unit 10 makes the determination in step S103 again.

When the control unit 10 determines in step S103 that the second raw material hopper 222 is full, the control unit 10 ends the initial transportation step S100 and proceeds to the first material weighing step in step S200. At this time, when the material is being transported to the second raw material hopper 222, the operation control unit 104 cuts off the main pipe 321 and the second exhaust pipe 323 in the switching unit 33, and the second raw material hopper Stop transporting material to 222. As described above, the initial transportation step in step S100 is completed.

When the initial transportation step in step S100 is completed, the control unit 10 subsequently performs a first material weighing step (step S200) and a second material weighing step (step S300). In step S200, the first material of r1 * MB, which is the weight of the first material per batch, is supplied from the first raw material hopper 212 to the measuring hopper 41. Further, in step S300, the second material of r2 * MB, which is the weight of the second material per batch, is supplied from the second raw material hopper 222 to the measuring hopper 41. The detailed steps in steps S200 and S300 will be described later.

The control unit 10 discharges the first material of r1 * MB and the second material of r2 * MB stored in the measuring hopper 41 to the stirring device 5 (step S400). The first material and the second material discharged to the stirring device 5 are stirred in the stirring device 5 and become a mixed material of MB in which the first material and the second material are mixed in a desired ratio. After that, the mixed material is transported to the supply hopper 71 of the powder or granular material transport destination 7 via the transport unit 6.

When the powder or granular material is discharged from the measuring hopper 41 in step S400, the control unit 10 determines whether or not the command signal S72 is input from the molding machine 72 to the command signal acquisition unit 103 (step S500).

If it is determined in step S500 that the command signal S72 has not been input, the control unit 10 returns to step S200 and supplies, measures, and discharges the first material and the second material in steps S200 to S400.

On the other hand, in step S500, when the control unit 10 determines that the command signal S72 is input to the command signal acquisition unit 103, the remaining required supply amount calculation unit 105 determines that the powder or granular material is transported to the molding machine 72 by the end of molding. The remaining required supply amount Mr to be transported to No. 7 is calculated (step S600). Specifically, the command signal S72 in the present embodiment is end notice information for notifying the remaining number of moldings or the remaining required material weight until the end of molding in the molding machine 72.

Specifically, in step S600 for the first time after the input of the command signal S72, the remaining required supply amount Mr is calculated based on the command signal S72. For example, when the command signal S72 is the remaining number of moldings, the remaining required supply amount Mr is calculated from the weight of the powder or granular material used for one molding in the molding machine 72 and the remaining number of moldings. When the command signal S72 is the remaining required material weight, the weight is set as the remaining required supply amount Mr.

Further, in the second and subsequent steps S600 after the input of the command signal S72, the batch amount MB discharged from the weighing hopper 41 per batch is reduced from the remaining required supply amount Mr obtained in the previous step S500. That is, (Mr-MB) is updated as a new Mr.

Following step S600, the control unit 10 determines whether or not the remaining required supply amount Mr is 0 or less (step S700). If it is determined in step S500 that the remaining required supply amount Mr is larger than 0, the control unit 10 returns to step S200 and weighs each material. On the other hand, if it is determined in step S500 that the remaining required supply amount Mr is 0 or less, the control unit 10 ends the weighing process in the weighing device 100.

Subsequently, a detailed flow of the measurement step of the first material in step S200 will be described below. Since the measurement step of the second material in step S300 is the same as the measurement step of the first material in step S200, the description thereof will be omitted.

In the first material weighing step, first, the control unit 10 determines whether or not the first raw material hopper 212 is full (step S201). Specifically, it is determined whether or not the first level signal S215 is input from the first level sensor 215 to the raw material level acquisition unit 101.

When it is determined in step S201 that the first raw material hopper 212 is full, the control unit 10 starts supplying the first material to the measuring hopper 41 in step S205.

Further, if it is determined in step S201 that the first raw material hopper 212 is not full, the control unit 10 determines whether or not the remaining required supply amount Mr has been calculated by the command signal acquisition unit 103 (step S202). As for "whether or not the remaining required supply amount Mr has been calculated" in step S202, it is determined that the command signal S72 has been input in step S500, and the remaining required supply amount Mr has been calculated by the remaining required supply amount calculation unit 105. Means that.

When the control unit 10 determines in step S202 that the remaining required supply amount Mr has not been calculated, the operation control unit 104 transports the material to the first raw material hopper 212 (step S204). Specifically, the operation control unit 104 communicates the main pipe 321 and the first exhaust pipe 322 in the switching unit 33 while driving the suction blower 31. As a result, the first material is transported from the first material supply source 211 into the first raw material hopper 212. Subsequently, the control unit 10 makes a determination in step S201 again for the first raw material hopper 212. Then, step S202, step S204, and step S201 are repeated until the first raw material hopper 212 is full.

On the other hand, if it is determined in step S202 that the remaining required supply amount Mr has been calculated, the control unit 10 determines that the remaining required supply amount r1 * Mr of the first material is equal to or less than the maximum charge amount Q1 of the first raw material hopper 212. Whether or not it is determined (step S203).

In step S203, when it is determined that the remaining required supply amount r1 * Mr of the first material is larger than the maximum charge amount Q1 of the first raw material hopper 212, the control unit 10 proceeds to step S204, and the operation control unit 104 first The material is transported to the raw material hopper 212. Then, step S201, step S202, step S203 and step S204 are repeated until the first raw material hopper 212 is full. After that, when the raw material hopper 212 reaches full, the process proceeds from step S201 to step S205.

If it is determined in step S203 that the remaining required supply amount r1 * Mr of the first material is equal to or less than the maximum charge amount Q1 of the first raw material hopper 212, the control unit 10 proceeds to step S205.

In step S205, the operation control unit 104 drives the screw feeder 214 to supply the first material from the first raw material hopper 212 to the measuring hopper 41. Then, when the supply of the first material is started, the control unit 10 monitors the weight Δm of the powder or granular material material input from the weight sensor 42 to the mass signal acquisition unit 102. Specifically, the control unit 10 calculates the current weight Δm1 of the first material from the difference between the current weight Δm and the weight Δm before the start of supply of the first material. Then, the control unit 10 determines whether or not the weight Δm1 of the first material is the required amount r1 * MB of the first material per batch (step S206).

If it is determined in step S206 that the weight Δm1 of the first material is not the required amount r1 * MB of the first material per batch, the process returns to step S205 and the supply of the first material is continued.

On the other hand, in step S206, when it is determined that the weight Δm1 of the first material has reached the required amount r1 * MB of the first material per batch, the supply of the first material is stopped and the weighing step of the first material in step S200 is performed. finish. When it is determined in step S206 that the weight Δm1 of the first material is larger than r1 * MB, the weighing step of the first material in step S200 is immediately completed, and the weight Δm1 of the first material is a predetermined tolerance. It may be determined whether or not it is within the range, and if the excess amount exceeds a predetermined tolerance ε, a warning operation such as displaying an error message may be performed.

The supply of the first material in step S205 may be performed intermittently or continuously. For example, when performing intermittently, the screw feeder 214 may be driven and stopped for a predetermined time to make a determination in step S206. Further, in the case of continuous operation, the determination in step S206 may be performed at predetermined intervals while the first material is being supplied in step S205.

By supplying the first material in the above procedure, after the command signal S72 is input from the molding machine 72 and the remaining required supply amount Mr is calculated, the first material exceeding the amount required until the molding is stopped is the first material. 1 Not transported to the raw material hopper 212. Further, since the supply step of the second material in step S300 is the same, the second material exceeds the amount required until the molding is stopped after the command signal S72 is input from the molding machine 72 and the remaining required supply amount Mr is calculated. The material is not transported to the second raw material hopper 222. Therefore, it is possible to suppress the residue of the powder or granular material in each part of the measuring device 100.

The remaining required supply amount r1 * Mr of the first material is updated by subtracting the amount of the first material supplied from the first raw material hopper 212 to the measuring hopper 41. In this case, at the same time as calculating the weight Δm1 of the current first material in step S205, the value obtained by subtracting the weight Δm1 of the current first material from r1 * Mr before the start of step S205 is required to remain in the current first material. It may be calculated as the supply amount r1 * Mr. Further, at the end of step S200, the value obtained by subtracting the first material required amount r1 * MB per batch from r1 * Mr before the start of step S205 is updated as the new remaining required supply amount r1 * Mr of the first material. You may.

<2. Modification example>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

FIG. 6 is a block diagram showing an electrical configuration of the weighing device according to a modified example. FIG. 7 is a flowchart showing the flow of the first material supply step (step S200) in the powder or granular material transfer device of the example of FIG. In the above embodiment, the maximum charge amounts Q1 and Q2 of the raw material hoppers 212 and 222 were known. However, different types of powder or granular material have different densities. Therefore, since the maximum charge amounts Q1 and Q2 are determined by weight, when the fullness is determined using the heights of the level sensors 215 and 225, the maximum charge amounts Q1 and Q2 at the time of fullness differ depending on the type of the powder or granular material.

Therefore, in the weighing device of the example of FIG. 6, as shown in FIG. 7, while performing the first material supply step, the first material weighing step (step S200) for estimating the maximum charge amount Q1 is performed. In the weighing device of the example of FIG. 6, the control unit 10 includes a raw material level acquisition unit 101, a mass signal acquisition unit 102, a command signal acquisition unit 103, an operation control unit 104, and a remaining required supply amount calculation unit 105. It has a charge amount calculation unit 106. Each unit 101 to 106 of the control unit 10 is a function processing unit realized by software by program processing by the CPU.

The charge amount calculation unit 106 is the maximum charge amount which is the maximum storage amount of the raw material hoppers 212 and 222 based on the mass signal S42 input from the weight sensor 42 and the level signals S215 and S225 input from the level sensors 215 and 225. Calculate the amount. Since steps S201 to S206 in FIG. 7 are the same as steps S201 to S206 in the above embodiment, the description thereof will be omitted.

In the examples of FIGS. 6 and 7, in the initial setting before starting the weighing process, the maximum charge amount Q1 is set to Q1 = 0 in the charge amount calculation unit 106, and the maximum charge amount Q1 is fixed. It is set that there is no such thing. In this way, in the charge amount calculation unit 106 of the control unit 10, whether or not the maximum charge amount Q1 is fixed is stored in addition to the value of Q1.

When the first material supply step S200 is started, the control unit 10 first determines whether or not the maximum charge amount Q1 of the first raw material hopper 212 is determined (step S207). In step S207, when the control unit 10 determines that the maximum charge amount Q1 has not been determined, the control unit 10 proceeds to step S208. Since the maximum charge amount Q1 has not been determined in the initial stage, the process proceeds to step S208 until the maximum charge amount Q1 is determined.

In step S208, similarly to step S205, the operation control unit 104 drives the screw feeder 214 to supply the first material from the first raw material hopper 212 to the measuring hopper 41. Then, when the supply of the first material is started, the control unit 10 monitors the weight Δm of the powder or granular material material input from the weight sensor 42 to the mass signal acquisition unit 102. Specifically, the control unit 10 calculates the current weight Δm1 of the first material from the difference between the current weight Δm and the weight Δm before the start of supply of the first material.

While supplying the first material in step S208, the control unit 10 determines whether or not the inside of the first raw material hopper 212 is empty and the first material is not insufficient (step S209). The determination may be made based on a signal from the sensor provided in the first raw material hopper 212 to detect an empty cup. Further, the judgment is that the first material is insufficient when the weight Δm input from the weight sensor 42 does not increase even after a lapse of a predetermined time even though the screw feeder 214 is driven. You may decide.

When it is determined in step S209 that the first material is not insufficient, the control unit 10 determines whether or not the weight Δm1 of the first material is the required amount r1 * MB of the first material per batch (step). S210).

If it is determined in step S210 that the weight Δm1 of the first material is not the required amount r1 * MB of the first material per batch, the process returns to step S208 and the supply of the first material is continued.

On the other hand, in step S206, when the control unit 10 determines that the weight Δm1 of the first material has reached the required amount r1 * MB of the first material per batch, the supply of the first material is stopped, and the charge amount calculation unit 106 , The value of the maximum charge amount Q1 is changed to the value Q1 + Δm1 obtained by adding the weight Δm1 of the first material supplied to the measuring hopper 41 to the value of Q1 up to that point (step S211). Then, the control unit 10 ends the step of measuring the first material in step S200.

In step S210, as in step S206, when the weight Δm1 of the first material becomes larger than r1 * MB and the excess amount exceeds a predetermined tolerance, an error message is displayed, etc. The warning operation may be performed.

In this way, when the maximum charge amount Q1 is not determined, the weight of the first material supplied to the weighing hopper 41 is added to the value of the maximum charge amount Q1 each time the supply of the first material for one batch is completed. I will do it.

On the other hand, when the control unit 10 determines in step S209 that the first material is insufficient, the charge amount calculation unit 106 first sets the value of the maximum charge amount Q1 to the value of Q1 up to that point, and the weighing hopper 41. The value is changed to Q1 + Δm1 by adding the weight Δm1 of the first material supplied to the above (step S212). As a result, the value of the maximum charge amount Q1 becomes the total weight of the first material supplied to the measuring hopper 41 until the first raw material hopper 212 is emptied. Then, the control unit 10 determines the value of the maximum charge amount Q1 (step S213).

After that, the control unit 10 causes the operation control unit 104 to start transporting the material to the first raw material hopper 212 (step S214), and proceeds to step S201. As a result, the process proceeds to steps S201 to S206, which are conventional steps when the maximum charge amount Q1 is fixed.

Further, when the maximum charge amount Q1 is determined when the supply step of the first material in step S200 is started, in step S207, the control unit 10 performs steps S201 to S206 as in the above embodiment. I do.

As in the examples of FIGS. 6 and 7, the first material supply step S200 may have a step for determining the maximum charge amount Q1 as shown in steps S207 to S214. The second material supply step S300 may also have a similar step. Further, when one of the maximum charge amount Q1 of the first raw material hopper 212 and the maximum charge amount Q2 of the second raw material hopper 222 is known and the other is unknown, only the supply process for the other raw material hopper is shown in FIG. And, as in the example of FIG. 7, it may have a step for determining the maximum charge amount Q1.

FIG. 8 is a flowchart showing the flow of the first material supply step (step S200) according to another modification. Steps S201 to S206 in the first material supply step of the example of FIG. 8 are the same as steps S201 to S206 of the above embodiment. In the example of FIG. 8, the control unit 10 executes step S215 after step S205 and before step S206.

In the first material supply step of the example of FIG. 8, first, as in the above embodiment, the first material stored inside the first raw material hopper 212 is filled or filled by steps S201 to S204. Alternatively, the remaining required supply amount of the first material is r1 * Mr.

After that, in step S205, the operation control unit 104 drives the screw feeder 214 to supply the first material from the first raw material hopper 212 to the measuring hopper 41. Then, when the supply of the first material is started, the control unit 10 monitors the weight Δm of the powder or granular material material input from the weight sensor 42 to the mass signal acquisition unit 102. Specifically, the control unit 10 calculates the current weight Δm1 of the first material from the difference between the current weight Δm and the weight Δm before the start of supply of the first material. At the same time, the value obtained by subtracting the weight Δm1 of the current first material from r1 * Mr before the start of step S205 is calculated as the current remaining required supply amount r1 * Mr of the first material. As a result, while the first material is being supplied from the first raw material hopper 212 to the measuring hopper 41, the remaining required supply amount r1 * Mr of the first material is sequentially updated.

Then, when Mr has already been calculated, the control unit 10 has a value (r1 * Mr−Δm1) obtained by subtracting the current weight Δm1 of the first material from the remaining required supply amount r1 * Mr of the first material as the first raw material. It is determined whether or not the maximum charge amount of the hopper 212 is Q1 or less (step S215). If Mr has not been calculated, the control unit 10 proceeds to step S206 without performing step S215.

If it is determined in step S215 that the remaining required supply amount r1 * Mr of the first material is larger than the maximum charge amount Q1 of the first raw material hopper 212, the control unit 10 proceeds to step S206.

On the other hand, if it is determined in step S215 that the remaining required supply amount r1 * Mr of the first material is equal to or less than the maximum charge amount Q1 of the first raw material hopper 212, the control unit 10 proceeds to step S800. FIG. 9 is a flowchart showing the flow of step S800.

As shown in FIG. 9, in step S800, when the first material is continuously supplied from the first raw material hopper 212 to the measuring hopper 41, the operation control unit 104 supplies the first material. Stop (step S801). Subsequently, the control unit 10 determines whether or not the first raw material hopper 212 is full (step S802).

If it is determined in step S802 that the first raw material hopper 212 is not full, the operation control unit 104 transports the first material to the first raw material hopper 212 (step S803). Subsequently, the control unit 10 makes the determination in step S802 again. Then, step S802 and step S803 are repeated until the first raw material hopper 212 is full.

When the control unit 10 determines in step S802 that the first raw material hopper 212 is full, the process proceeds to step S804. At this time, when the material is being transported to the first raw material hopper 212, the operation control unit 104 stops the transportation of the first material to the first raw material hopper 212.

Then, the control unit 10 resumes the supply of the first material from the interrupted first raw material hopper 212 to the measuring hopper 41 (step S804). At this time, similarly to step S205, the control unit 10 monitors the weight Δm of the powder or granular material material input from the weight sensor 42 to the mass signal acquisition unit 102. Then, the weight Δm1 of the first material and the remaining required supply amount r1 * Mr of the first material are sequentially updated.

Subsequently, the control unit 10 determines whether or not the weight Δm1 of the first material is the required amount r1 * MB of the first material per batch (step S805). If it is determined in step S805 that the weight Δm1 of the first material is not the required amount r1 * MB of the first material per batch, the process returns to step S205 and the supply of the first material is continued.

On the other hand, in step S805, when it is determined that the weight Δm1 of the first material has reached the required amount r1 * MB of the first material per batch, the supply of the first material is stopped, and the first material in steps S800 and S200 The weighing process is completed. In step S805, as in steps S206 and S210, when the weight Δm1 of the first material becomes larger than r1 * MB and the excess amount exceeds a predetermined tolerance, an error message is displayed. A warning operation such as displaying may be performed.

In the example of FIG. 8, while the first material is being supplied from the first raw material hopper 212 to the measuring hopper 41, the remaining required supply amount r1 * Mr of the first material is the maximum charge amount of the first raw material hopper 212. When Q1 is reached, the first raw material hopper 212 is filled. As a result, the first raw material hopper 212 can be supplied with just the exact amount of the required first material. Therefore, the residue of the powder or granular material in the first raw material hopper 212 can be suppressed as much as possible.

In step S215, it may be determined whether or not the remaining required supply amount r1 * Mr of the first material is Q1 + e or less. Q1 + e is a value slightly larger than the maximum charge amount Q1 of the first raw material hopper 212. In this way, the first raw material hopper 212 is supplied with a slightly larger amount of the first material than just the exact amount of the required first material. As a result, it is possible to prevent a shortage of the first material to be supplied to the measuring hopper 41 due to a measuring error or the like.

FIG. 10 is a flowchart showing the flow of the first material supply step (step S200) according to another modification. In the example of FIG. 10, a step for determining the maximum charge amount Q1 shown in steps S207 to S214 is provided as in the example of FIG. 6, and steps S215 and S800 (as in the example of FIG. 8) It has a step for finely adjusting the supply amount of the first material shown in FIG. 9). In this way, various steps may be combined.

Further, in the above embodiment, the remaining required supply amount Mr calculated in step S600 is the powder or granular material to be transported to the powder or granular material transport destination 7 by the end of molding of the molding machine 72 at the time of executing step S600. It was a quantity. However, in step S600, the weight of the powder or granular material contained in the lines after the measuring device 5 including the stirring device 5, the transport unit 6, and the supply hopper 71 is subtracted from the amount of the powder or granular material, and the remaining required supply amount Mr. May be calculated. In this way, the amount of powder or granular material remaining in the powder or granular material transport device 1 can be suppressed even on the downstream side of the measuring device 4.

Further, in the above-described embodiment and modification, two types of powder or granular material materials are weighed. However, the measuring device of the present invention may measure one kind of powder or granular material, or may measure three or more kinds of powder or granular material.

Further, the detailed shapes of the weighing device and the powder or granular material transfer system may be different from the shapes shown in the respective figures of the present application.

Further, the elements appearing in the above-described embodiments and modifications may be appropriately combined as long as there is no contradiction.

1 Powder and granular material transportation system 2 Material supply unit 3 Air flow generator 4 Measuring device 5 Stirring device 6 Transportation unit 7 Powder and granular material transportation destination 10 Control unit 11 Transportation means 12 Supply means 21 First material supply unit 22 Second material supply unit 41 Weighing hopper 42 Weight sensor 72 Molding machine 100 Weighing device 101 Raw material level acquisition unit 102 Mass signal acquisition unit 103 Command signal acquisition unit 104 Operation control unit 105 Remaining required supply amount calculation unit 211 1st material supply source 212 1st raw material hopper 214 Screw feeder 215 1st level sensor 221 2nd material source 222 2nd raw material hopper 224 Screw feeder 225 2nd level sensor

Claims (13)

It is a measuring device that measures powder and granular material.
A first material storage unit that temporarily stores the powder or granular material, and
A second material storage unit that temporarily stores the powder or granular material, and
A transportation means for transporting the powder or granular material from the material supply source to the first material storage unit, and
A supply means for supplying the powder or granular material from the first material storage unit to the second material storage unit, and
A measuring means for measuring the powder or granular material stored in the second material storage unit, and
A control unit that controls each unit and
Have,
The control unit
A mass signal acquisition unit to which a mass signal is input from the measuring means,
An operation control unit that controls the operation of the transportation means and the supply means,
A command signal acquisition unit that receives a command signal from the outside,
A residual required supply amount calculation unit that calculates the remaining required supply amount to the second material storage unit based on the command signal, and a residual required supply amount calculation unit.
Including
The motion control unit
A transportation step of transporting the powder or granular material from the material supply source to the transportation means until the first material storage portion is full.
A supply step of causing the supply means to supply a predetermined amount of the powder or granular material from the first material storage unit to the second material storage unit.
To be executed repeatedly,
When the control unit determines that the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit , the operation control unit stops the transportation process in the transportation means , and the supply means is used. A weighing device that allows the supply process to be performed the required number of times. The weighing device according to claim 1.
The control unit is a weighing device that determines whether or not the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit after the end of the supply process and before the start of the transportation process. The weighing device according to claim 1.
The control unit determines whether or not the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit after the end of the supply process and before the start of the transportation process and in the supply process. During the period and
When the control unit determines that the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit during the period of the supply process, the operation control unit interrupts the supply process and transports the transport. A weighing device that causes a means to perform the transportation process only once, and then stops the transportation process in the transportation means to perform the supply process by the supply means a required number of times. The weighing device according to any one of claims 1 to 3.
The first material storage unit is
A sensor that detects the maximum storage height or mass of the powder or granular material material stored in the first material storage unit.
With
The control unit
The raw material level acquisition unit to which the level signal from the sensor is input and
Charge amount calculation unit that calculates the maximum storage amount of the first material storage unit based on the mass signal and the level signal.
Further, a weighing device. The weighing device according to any one of claims 1 to 4.
A weighing device having a plurality of the first material storage units. The weighing device according to claim 5.
A stirring device arranged below the second material storage unit and agitating the powder or granular material material discharged from the second material storage unit.
Further, a weighing device. The weighing device according to any one of claims 1 to 6,
A transport pipe for suction transport, which transports the powder or granular material material discharged from the measuring device to a transport destination, and
An airflow generator that generates an airflow from the weighing device to the transport destination inside the transport pipe, and an airflow generator.
A powder or granular material transport device having. In the measuring device for measuring the powder or granular material, the powder or granular material temporarily stored in the first material storage is transported to the second material storage, and the powder or granular material is transported in the second material storage. Is a weighing method that weighs multiple times.
a) A step of transporting the powder or granular material from the material supply source to the first material storage unit, and
b) While supplying the powder or granular material from the first material storage to the second material storage, the powder or granular material supplied to the second material storage is weighed and a predetermined amount of the powder is measured. The process of supplying the granular material to the second material storage unit and
c) The process of inputting a command signal from the outside and
d) A step of calculating the remaining required supply amount to the second material storage unit based on the command signal, and
e) A step of determining whether or not the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit, and
Have,
While repeating the steps a) and b),
While the steps a) and b) are repeatedly executed, the steps c), d) and e) are executed.
When it is determined in the step e) that the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit, the step a) is stopped and the step b) is performed a required number of times. Weighing method. The weighing method according to claim 8.
The measuring method, wherein the step e) is executed after the completion of the step b) and before the start of the step a). The weighing method according to claim 8.
The step e) is executed after the end of the step b) and before the start of the step a), and is also executed during the period of the step b).
If it is determined that the remaining required supply amount is equal to or less than the maximum storage amount of the first material storage unit during the period of the step b), the step b) is interrupted and the step a) is executed only once. Then, the measuring method in which the step a) is stopped and the step b) is executed a required number of times. The weighing method according to any one of claims 8 to 10.
In step a),
a1) Prior to the step b), a step of transporting the powder or granular material to the first material storage section up to the maximum storage amount, and
a2) According to the step b), the step of stopping the transportation of the powder or granular material to the first material storage section until the first material storage section is emptied.
a3) After the step a2), when the first material storage section is emptied, a step of calculating the maximum charge amount of the first material storage section and
a4) After the step a3), the step of transporting the powder or granular material to the first material storage unit again, and
Weighing methods, including. The weighing method according to any one of claims 8 to 11.
The weighing device has a plurality of the first material storage units, and has a plurality of the first material storage units.
A weighing method for carrying out the steps a) to e) for each of the plurality of first material storage units. The weighing method according to claim 12.
f) In the step b), the step of stirring the powder or granular material supplied from the plurality of first material storage portions and weighed.
A weighing method that further comprises.

Images