JP2010214964A - Aggregate discriminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device which can distinguish whether an aggregate which is dumped into an aggregate accepting hopper is gravel or sand at a point time when the aggregate is dumped. <P>SOLUTION: An air nozzle 15 is mounted to the side of the aggregate accepting hopper 3, and an air supply unit 17 is connected to the air nozzle 15 through an air supply pipe 16. An air pressure sensor 18 is mounted to a way position to the air supply pipe 16. Furthermore, a controller 20 which determines the operation stop of an aggregate conveying conveyor 6 by distinguishing whether the aggregate 2 is the gravel or the sand on the basis of the detected value of the air pressure sensor 18 is provided. When pressurized air is discharged from the air supply unit 17 into the aggregate accepting hopper 3 through the air nozzle 15, whether the aggregate 2 is the gravel or the sand is distinguished by the controller 20 on the basis of the detected value detected by the air pressure sensor 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an aggregate discriminating apparatus used for discriminating whether an aggregate put into an aggregate receiving hopper in a concrete manufacturing facility is gravel or sand.

  In general, gravel as coarse aggregate and raw aggregate as raw material of ready-mixed concrete in concrete production equipment is carried into the concrete production equipment by a vehicle, etc., and then the gravel and sand carried in are respectively When the ready-mixed concrete is produced, it is stored once in a separate gravel storage tank and sand storage tank. It is intended for use in ready-mixed concrete production. Therefore, in the above concrete manufacturing equipment, when the aggregate is carried in by a vehicle or the like, it is necessary to switch the storage tank to be stored depending on whether the carried aggregate is gravel or sand. There is.

  For this purpose, as shown in FIG. 3, a gravel storage tank 4 and a sand storage tank 5 (in the figure, 2 respectively) are provided downstream of the aggregate receiving hopper 3 that receives the aggregate 2 conveyed by the vehicle 1 or the like. And a belt conveyor 6 installed so as to reach above the storage tanks 4 and 5 from the lower end of the aggregate receiving hopper 3, and the storage tanks 4 and 5. On the upper side, the aggregate 2 transferred by the belt conveyor 6 is received, and the transfer destination (input destination) of the aggregate 2 is selectively selected as one of the gravel storage tank 4 and the sand storage tank 5. An aggregate distribution mechanism 8 provided with a shuttle belt conveyor 7 that can be switched to the above is provided. Further, although not shown, the aggregate receiving hopper 3 is put in the vicinity of the aggregate receiving hopper 3. An operation to indicate whether the aggregate 2 is gravel or sand Van is provided with, gravel in this operation panel, the shuttle belt conveyor 7 by an indication of sand are to be moved to a predetermined position.

  In the case where gravel and sand are sorted and stored using the aggregate distribution mechanism 8, when the aggregate 2 put into the aggregate receiving hopper 3 from the vehicle 1 or the like is gravel, Since the operator instructs the gravel to be gravel on the operation panel, the shuttle belt conveyor 7 of the aggregate distribution mechanism 8 is disposed so that the transfer destination is the gravel storage tank 4. The gravel accepted by the receiving hopper 3 can be transferred to the gravel storage tank 4 from the shuttle belt conveyor 7 by being transferred by the belt conveyor 6, and the aggregate 2 received by the aggregate receiving hopper 3 is In the case of sand, the shuttle belt conveyor 7 is arranged so that the transfer destination is the sand storage tank 5 according to the same instruction, so that the sand 2 received by the aggregate receiving hopper 3 is By transferring at Rutokonbeya 6 it is to be able to put into the sand storage tank 5 from the shuttle belt conveyor 7.

  However, in this case, the aggregate 2 actually put into the aggregate receiving hopper 3 is gravel due to the operator's misunderstanding or operation mistake, etc., but the operator instructs sand on the operation panel, or the reverse In addition, when the aggregate 2 actually put into the aggregate receiving hopper 3 is sand, but the operator instructs gravel on the operation panel, gravel is thrown into the sand storage tank 5, There is a risk that sand will enter the gravel storage tank 4 and the sand and gravel will be mixed. In this case, the mixture of sand and gravel as described above is supplied to the batcher plant from the storage tanks 4 and 5 without being noticed. If this happens, the quality of the ready-mixed concrete manufactured at the batcher plant will be deteriorated, or the product manufactured by using this poor-quality ready-mixed concrete or defects in the concrete construction will be caused. May occur. Even if you notice the mixing of sand and gravel before supplying to the batcher plant, it takes a lot of labor and time to separate the gravel and sand mixture put in the storage tanks 4 and 5. There is also a problem that it takes.

  Therefore, it is desirable to provide a device for discriminating whether the aggregate 2 received by the aggregate receiving hopper 3 is gravel or sand so as to prevent the above-described human error. Conventionally, the following has been proposed.

  As one of the conventionally proposed aggregate discriminating devices, for example, as shown in FIG. 4, a head chute 10 is provided at the downstream end of the belt conveyor 9 and a vibration detector 11 is attached to the head chute 10. Alternatively, an aggregate receiving hopper 12, a skirt 13 connected to the lower end of the aggregate receiving hopper 12, and collecting the aggregate that is dropped and supplied from the aggregate receiving hopper 12 to the belt conveyor 9, the skirt 13 The vibration detector 11 is attached to a transport amount adjusting member 14 or the like that is provided on the belt conveyor 9 to adjust the transport amount of the aggregate, and the head chute 10, the aggregate receiving hopper 12, the skirt 13, and the transport amount adjusting member. When the aggregate passes through 14 in contact with the aggregate, the vibration detector 11 detects vibrations generated in the members 10, 12, 13, and 14 due to the contact of the aggregate. Using the fact that the magnitude of vibration differs depending on the difference in mass between sand and gravel, the aggregate conveyed from the aggregate receiving hopper 12 to the storage tank is gravel or sand based on the magnitude of the vibration. There is one that determines whether or not there is (see, for example, Patent Document 1).

  In addition, when granular materials having different particle sizes such as gravel and sand are conveyed by a belt conveyor, the granular materials conveyed by the belt conveyor can be distinguished according to the particle size. An object is imaged with an imaging device such as a CCD camera, and the frequency distribution is obtained by Fourier transforming the gradation change of light and darkness of the obtained image data with an image processing device such as a computer, and the average frequency is obtained from the obtained frequency distribution. There is also proposed a method in which the average particle size is used to determine the particle size of the granular material (see, for example, Patent Document 2).

JP-A-8-57840 JP-A-6-180279

  However, in the one shown in Patent Document 1, the vibration detector 11 is used as the head chute 10 of the belt conveyor 9, the skirt 13 of the aggregate receiving hopper 12, or the transport amount adjusting member provided on the skirt 13. 14, there is a problem that due to the configuration, the aggregate can be discriminated only after the conveyance by the belt conveyor 9 is started, and the discrimination of the material is delayed accordingly. In particular, when the determination is made by the vibration detector 11 attached to the head chute 10, there is a possibility that the determination timing is too late to be in time for the next automatic processing. On the other hand, when the vibration detector 11 is installed in the aggregate receiving hopper 12, vibration is generated in the aggregate receiving hopper 12 when the aggregate 2 is loaded into the aggregate receiving hopper 12. In the same manner as described above, it is possible to determine whether the aggregate 2 is gravel or sand before being conveyed by the belt conveyor 9 by detecting with the vibration detector 11, but in this case, the inner circumference of the aggregate receiving hopper 12 is determined. A rubber member is usually used on the surface to prevent wear, and vibration due to the aggregate 2 being put into the hopper is difficult to be transmitted to the vibration detector 11, and there is a concern that the discrimination may be wrong. Further, after the time when the level of the aggregate 2 put into the hopper 12 passes through the installation position of the vibration detector 11 and becomes low, the vibration cannot be detected by the vibration detector 11 and the aggregate 2 cannot be identified. There is also a problem. Furthermore, the aggregate receiving hopper 12 is moved to the aggregate receiving hopper 12 depending on the dropping position of the aggregate 2 in the hopper when the aggregate is loaded from the conveying vehicle to the aggregate receiving hopper 12 or the speed (momentum) of loading the aggregate from the conveying vehicle. There is a concern that the generated vibration may change greatly, and accordingly, there is a concern that an error may occur in the determination result with the change of the vibration.

  The one disclosed in Patent Document 2 has a problem that it is expensive because it requires an imaging device such as a CCD camera and an image processing device such as a computer.

  Therefore, the present invention can determine whether the aggregate is gravel or sand at the time when the aggregate is input to the aggregate receiving hopper without being affected by the amount of aggregate and the manner of input, In addition, an aggregate discriminating apparatus that can reduce the installation cost is provided.

  In order to solve the above-mentioned problem, the present invention, corresponding to claim 1, is attached to the side portion of the aggregate receiving hopper with an air nozzle for discharging air into the aggregate in the hopper, and is connected to the air nozzle. An air pressure sensor is installed in the middle of the air supply pipe, and the aggregate conveyor is stopped by determining whether the aggregate is gravel or sand based on the detected value of the air pressure sensor. It is set as the structure provided with the control apparatus which judges this.

  Further, in accordance with claim 2, the control device having the above-described configuration includes a discriminating unit that predetermines an air pressure when the aggregate in the aggregate receiving hopper is gravel or sand and determines a boundary value of gravel or sand. And the judgment result of the judgment unit and the gravel or sand instruction content at the time of throwing the aggregate into the aggregate receiving hopper, and determining the information to issue an instruction to stop the operation of the aggregate transport conveyor if they do not match It is set as the structure which has a part.

According to the aggregate discrimination device of the present invention, the following excellent effects are exhibited.
(1) An air nozzle that discharges air into the aggregate in the hopper is attached to the side of the aggregate receiving hopper, an air pressure sensor is attached in the middle of the air supply pipe connected to the air nozzle, and the air The aggregate receiving hopper includes a control device that determines whether the aggregate is gravel or sand based on the detection value of the pressure sensor, and determines whether the aggregate conveyor is stopped. Because of the difference in the air pressure discharged into the aggregate thrown into the aggregate, the aggregate can be easily discriminated as gravel or sand without being affected by the amount of aggregate, and promptly deal with it Is possible. In addition, because of the air pressure discharged into the aggregate, there is little influence from external factors.
(2) In addition, the control device obtains an air pressure in advance when the aggregate in the aggregate receiving hopper is gravel or sand, and determines a boundary value of gravel or sand, and a discrimination in the discrimination unit Because it is configured to have an information judgment unit that judges the result and the gravel or sand instruction contents at the time of aggregate input to the aggregate receiving hopper, and issues an instruction to stop the operation of the aggregate conveying conveyor in the case of mismatch , It is possible to determine whether the air pressure exceeds a predetermined boundary value, whether gravel or sand, and automatically when it does not match the gravel or sand instructions before the aggregate is input to the aggregate receiving hopper Since the conveyor is stopped, gravel and sand are not mixed.

It is the schematic which shows one Embodiment of the aggregate discrimination device of this invention. It is a figure which shows the structural example of the control apparatus in the apparatus shown in FIG. It is the schematic which shows an example of the aggregate distribution mechanism in concrete manufacturing equipment. It is the schematic which shows an example of the aggregate discrimination device proposed conventionally.

  Embodiments for carrying out the present invention will be described below with reference to the drawings.

  1 and 2 show an embodiment of the aggregate discriminating apparatus of the present invention. As in the case shown in FIG. 3, an aggregate receiving hopper 3 is provided with an aggregate 2 conveyed by a vehicle or the like. It is transferred to the belt conveyor 6 from the aggregate receiving hopper 3 and sent to each storage tank for sand and gravel, and is transported by a vehicle or the like to a position near the aggregate receiving hopper 3. In the configuration in which the operation panel for instructing whether the aggregate 2 is sand or gravel is provided, air is passed from the outside of the hopper 3 to the inside of the hopper 3 at a required position on the side wall of the aggregate receiving hopper 3. A single or a plurality of air nozzles 15 for discharging the water are attached, and a level meter 19 is provided at a required height position. The air nozzle 15 is connected to an air supply device 17 such as an air pump through an air supply pipe 16 so that pressurized air is discharged from the air nozzle 15 into the aggregate receiving hopper 3. The level meter 19 is connected to the air supply device 17 so that air is discharged by a signal from the level meter 19.

  An air pressure sensor 18 for detecting the pressure of the discharged air is provided in the middle of the air supply pipe 16 so that a change in the air pressure in the air supply pipe 16 is detected and input to the control device 20. .

  As shown in FIG. 2, the control device 20 preliminarily determines the air pressure discharged from the air nozzle 15 when the aggregate 2 put into the aggregate receiving hopper 3 is gravel and sand. The boundary value between the pressure value for gravel and the pressure value for sand is determined as a set value by the sensor 18 and discharged from the air nozzle 15 to the aggregate 2 that is actually put into the aggregate receiving hopper 3. It is determined whether the air pressure exceeds the boundary value as the above set value or not, and when it exceeds the boundary value, it is determined as “gravel”, and when it does not exceed it, it is determined as “sand”. A discriminator 21 and an information discriminator 22 that discriminates whether or not the actual sand or gravel information discriminated by the discriminator 21 is coincident with the sand or gravel instruction signal instructed on the operation panel. And the information determination unit If the determination result in 2 is the same, the operation is continued without stopping the operation of the belt conveyor 6, and if it is not the same, an operation stop command is issued to the driving device of the belt conveyor 6, and an alarm device is provided. It has a structure having a function of giving an alarm generation command to

  When the aggregate 2 put into the aggregate receiving hopper 3 is gravel, since the particle size is larger than that of sand, there is a gap between the particles, and the gap between the aggregates 2 is large. On the other hand, when the aggregate 2 is sand, since the particle size is small, a gap between the particles is hardly generated, and the gap between the aggregates 2 is small. Therefore, when a certain amount of air is discharged from the side surface of the accumulated aggregate 2, the gravel is easier to escape to the outside than the sand, and the air pressure is relatively low in the case of gravel, In the case of sand, the air pressure is high.

  When discriminating the aggregate 2 using such a phenomenon, the operator is first transported before the aggregate 2 transported by the vehicle or the like is put into the aggregate receiving hopper 3. An instruction is given on the operation panel as to whether the aggregate 2 that has come is sand or gravel, and it can be stored in each storage tank of sand or gravel according to the instruction.

  Next, the conveyed aggregate 2 is put into the aggregate receiving hopper 3 and deposited from the bottom of the hopper 3.

  When the level of the aggregate 2 deposited on the aggregate receiving hopper 3 reaches a certain level, the level meter 19 is operated to give an air supply command to the air supply device 17. Thus, air pressurized to a predetermined pressure is discharged from the air supply device 17 toward the aggregate 2 in the aggregate receiving hopper 3 through the air nozzle 15. When the aggregate 2 is gravel, since the pressure of air discharged into the gravel is low, the pressure is detected by the air pressure sensor 18 and sent to the determination unit 21 of the control device 20. Since the predetermined boundary value is set in the determination unit 21, it is determined whether the pressure level from the input air pressure sensor 18 exceeds or does not exceed the boundary value, and the air pressure in the case of gravel is Since the boundary value is not exceeded, the determination unit 21 determines it as “gravel”. On the other hand, when the aggregate 2 in the aggregate receiving hopper 3 is sand, the air pressure discharged from the air nozzle 15 into the sand becomes high, so that the air pressure is detected by the air pressure sensor 18 and the control device It is sent to 20 discrimination units 21. The determination unit 21 determines whether or not the boundary value is exceeded. However, since the air pressure when the aggregate 2 is sand is high, the boundary value is exceeded, so the determination unit 21 determines “sand”. Is done.

  As described above, when the determination unit 21 determines “gravel” or “sand”, the information determination unit 22 determines whether it matches or does not match the instruction content on the operation panel. If the determination results match, the operation of the belt conveyor 6 is continued as it is. On the other hand, if the determination results do not match, an instruction is immediately sent to the drive device of the belt conveyor 6 to stop the operation and to issue a warning for attention.

  The present invention is not limited to the above-described embodiment. For example, a level meter 19 is provided on the side surface of the aggregate receiving hopper 3 near the installation position of the air nozzle 15 so that the aggregate receiving hopper 3 Although the case where the air supply is automatically performed when the aggregate 2 is thrown in is shown, the present invention can be implemented even without the level meter 19, and various other modifications can be made without departing from the scope of the present invention. Of course, changes can be made.

2 Aggregate 3 Aggregate receiving hopper 6 Belt conveyor 15 Air nozzle 16 Air supply pipe 18 Air pressure sensor 20 Controller 21 Discriminating unit 22 Information determining unit

Claims (2)

  An air nozzle that discharges air into the aggregate in the hopper is attached to the side of the aggregate receiving hopper, an air pressure sensor is attached in the middle of an air supply pipe connected to the air nozzle, and the air pressure sensor An aggregate discriminating apparatus comprising a control device that discriminates whether the aggregate is gravel or sand based on a detection value, and judges operation stop of the aggregate transport conveyor. .   The control device includes a discriminator that predetermines the air pressure when the aggregate in the aggregate receiving hopper is gravel or sand and determines the boundary value of gravel or sand, the discriminant result in the discriminator and the aggregate acceptance The bone according to claim 1, further comprising: an information determining unit that determines the gravel or sand instruction content when the aggregate is put into the hopper, and issues a command to stop the operation of the aggregate transport conveyor when there is a mismatch. Material discrimination device.

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