JP6595667B2 - Light aggregate supply device and light aggregate supply method - Google Patents

Description

  The present invention relates to a lightweight aggregate supply device and supply method in a ready-mixed concrete production plant.

  Conventionally, ready-mixed concrete production plants have been provided with a plurality of aggregate storage tanks in the aggregate storage yard, and necessary aggregates are carried out by a drawer conveyor below each storage tank, and the aggregates taken out are inclined conveyors. Then, the materials such as cement, admixture, and water are put into each measuring tank and weighed separately, and the measured raw materials are kneaded by the mixer. After being mixed, it will be thrown into a live concrete car on the ground.

  Among the above aggregates, lightweight aggregates having a specific gravity of about 1.6 (for example, natural light aggregates such as pumice, volcanic gravel, etc.) need to be sufficiently water-absorbed (watered) by watering or flooding in advance. Wetting), the above-mentioned conventional aggregate storage tank is also used having watering equipment.

  In order to make the surface water ratio of the aggregate uniform, a lightweight aggregate is put into the aggregate storage bottle, and a conveyor is installed to return the aggregate from the lower open / close gate of the measuring instrument to the aggregate storage tank. There has been proposed an apparatus for making the surface water rate of the aggregate uniform by mixing the aggregate in the aggregate storage tank by introducing the aggregate from the upper part of the tank (Patent Document 1).

JP-A-9-155850

  If the lightweight aggregate is stored in a storage tank or an aggregate storage bottle in a manufacturing plant for a long time, all or part of the aggregate is solidified and cannot be taken out from the lower open / close gate of the storage bottle. There was a problem that storage was difficult.

  That is, if the lightweight aggregate is used in a ready-mixed concrete manufacturing plant, there is no dedicated storage bottle for lightweight aggregate. For example, the sand storage bottle is emptied and the sand storage bottle is used. It is conceivable that the light weight aggregate after addition of water is put into the storage bottle, but if the light weight aggregate that has been added is placed in a stationary state where it is not discharged for a long time (for example, one day) in the storage bottle of the plant, Even if the lightweight aggregate partially solidifies and then the discharge gate is opened, there is a problem that the dead stock of the measurement aggregate is generated in the storage bottle, and it is not smoothly discharged.

  The device of Patent Document 1 has an effect of making the surface water ratio of the aggregate uniform, but since the aggregate is once put into the aggregate storage bottle, the aggregate stays in the storage bottle for a long time. Thus, solidification in the storage bottle may occur. Therefore, even if this apparatus of Patent Document 1 is applied to a lightweight aggregate, the problem that the lightweight aggregate after addition of water in the aggregate storage bottle is solidified as a result cannot be solved.

  The present invention has been made in view of the above-described conventional problems, and in a ready-mixed concrete production plant, it is possible to directly add the light aggregate after hydration from the lightweight aggregate hopper to the measuring tank. By returning to the lightweight aggregate hopper, the lightweight aggregate circulates in the supply device, so that the lightweight aggregate does not stop and solidify, and the lightweight aggregate supply device It aims to provide a method.

In order to achieve the above object, the present invention
1stly, it is the lightweight aggregate supply apparatus which supplies a lightweight aggregate to a ready-mixed concrete manufacturing plant, Comprising: The lightweight aggregate hopper which accepts the lightened lightweight aggregate is provided, The said lightweight bone is provided from the said lightweight aggregate hopper. There is provided a first conveyor for carrying out the material, and elevating and lowering means for conveying the lightweight aggregate carried out by the first carry-out conveyor to a height at which it can be supplied to the weighing tank of the ready-mixed concrete production plant, A second conveyor that receives the lightweight aggregate conveyed by the elevating and conveying means from the upper opening is provided, and the second conveyor is connected to the measuring tank at its tip and is rotated forward. The necessary amount of light aggregate transported by the lifting and transporting means is directly put into the measuring tank from the front end portion , and is reversed so that the second transport conveyor enters the second transport conveyor. Residual That is intended to convey a lightweight aggregate in the opposite direction, conveying means for connecting the lower opening and the lightweight aggregate hopper end of the reverse conveying side of the second transfer conveyor is provided, wherein The transport means is configured such that the lightweight aggregate remaining in the second transport conveyor is thrown from the lower opening when the second transport conveyor is reversed, and the lightweight bone thrown from the lower opening is It is comprised by the supply apparatus of the lightweight aggregate which returns a material to the said lightweight aggregate hopper.

  The first transport conveyor can be constituted by, for example, a screw conveyor (17). The elevating / conveying means can be constituted by, for example, a bucket elevator (18). The said 2nd conveyance conveyor can be comprised by the forward / reverse screw conveyor (21), for example. The said conveyance means can be comprised by a chute pipe (23), for example. If comprised in this way, the light-weight aggregate added with water can be directly measured and used for a measurement tank, and the light-weight aggregate after addition other than the lightweight aggregate input into the measurement tank is 2nd. By reversing the transport conveyor, the route of the transport means, lightweight aggregate hopper, first transport conveyor, lifting transport means, and second transport conveyor can be circulated and stored in one storage tank for a long time Therefore, the required amount of lightweight aggregate can be used at any time.

  2ndly, the said light-weighted aggregate is watered in the aggregate storage tank which has the watering equipment in an aggregate storage yard, and the said lightweight aggregate is the said lightweight bone from the said aggregate storage tank. It is comprised by the supply apparatus of the said lightweight aggregate of said 1st thing conveyed by a 3rd conveyance conveyor to a material hopper.

  The third transfer conveyor can be constituted by, for example, a transfer screw conveyor (15c). If comprised in this way, it can add water suitably in the aggregate storage tank in the said lightweight aggregate storage yard, and takes in the required amount of lightweight aggregate after addition to a lightweight aggregate hopper with a 3rd conveyance conveyor suitably. be able to.

  Thirdly, each of the first transport conveyor and the second transport conveyor is configured by the lightweight aggregate supply device according to the first or second aspect, which is configured by a screw conveyor.

  4thly, the said raising / lowering conveyance means is a bucket elevator, It is comprised by the lightweight aggregate supply apparatus in any one of said 1st-3rd characterized by the above-mentioned.

Fifth, a lightweight aggregate supply method using the lightweight aggregate supply apparatus according to the first aspect, wherein the lightweight aggregate hydrated by the lightweight aggregate hopper is received, and the lightweight aggregate hopper receives the aggregate. the lightweight aggregate is unloaded at the first conveyance conveyor, high that the lightweight aggregate is carried out by the first conveyance conveyor can be supplied to the measuring tank the raw concrete manufacturing plant in the elevator conveying means The required amount of the lightweight aggregate received from the elevating and conveying means is put into the measuring tank by rotating the second conveying conveyor forward, and the lightweight bone is put in the measuring tank. The material is weighed and the second transport conveyor is reversed to transport the lightweight aggregate remaining in the second transport conveyor in the reverse direction, and the second transport conveyor is reversed to perform the reverse operation. Transported in the direction above the remaining above The amount aggregate was charged into the conveying means, by returning to the lightweight aggregate hopper through the conveying means, the lightweight aggregate to the remaining, the lightweight aggregate hopper, the first conveyor, the lifting conveyor means The second aggregate is constituted by a method for supplying a lightweight aggregate which is circulated to the lightweight aggregate hopper via the second conveyor and the conveyor .

The present invention, as described above, can be used by directly weighing the lightweight aggregate that has been added to the weighing tank and using it, and after adding the lightweight aggregate other than the lightweight aggregate charged in the weighing tank , By reversing the second conveyor, it can be circulated in the supply device, preventing the lightweight aggregate from being stored for a long time in one storage tank (dead stock), and the required amount Lightweight aggregate can be used at any time.

  Further, water can be appropriately sprinkled in the aggregate storage tank in the lightweight aggregate storage yard, and a necessary amount of light aggregate after addition of water can be appropriately taken into the lightweight aggregate hopper by the third transport conveyor.

It is the front view which made a part of supply apparatus of the lightweight aggregate concerning the present invention a section. It is a side view which made a part of apparatus same as the above into a section. It is a cross-sectional view of the vicinity of the weighing tank of the apparatus. It is an enlarged front view of the vicinity of the weighing tank of the apparatus. It is an enlarged side view of the measuring tank vicinity of the apparatus same as the above. It is explanatory drawing of the lightweight aggregate storage tank with a watering function of the aggregate storage yard in an apparatus same as the above. It is an electrical block diagram of an apparatus same as the above. It is a flowchart which shows the operation | movement procedure of the control part of an apparatus same as the above.

  Hereinafter, a lightweight aggregate supply device and a lightweight aggregate supply method according to the present invention will be described in detail.

  1 and 2, reference numeral 1 denotes a ready-mixed concrete production plant, and a casing 2 having a vertically long rectangular parallelepiped shape is provided on a rectangular base frame 4, and leg portions are provided at the four corners of the rectangular base frame 4. 3 are provided, and the casing 2 is constructed on the ground G in a standing state by the legs 3.

  In the housing 2, a plurality of storage bottles 5a, 5b and the like for storing aggregates for each type are provided in the upper part. A turn chute 6 is provided on the upper part of these storage bottles 5a and 5b, and the aggregate carried by the inclined conveyor from the aggregate storage tank in the aggregate storage yard (not shown) is the upper part 6a of the turn chute 6. The aggregate is put into each of the corresponding aggregate storage bottles 5a and 5b by the turn chute 6 for each type.

  Opening / closing gates 7 are respectively provided at the lower portions of the storage bottles 5a, 5b, and the opening / closing gates 7 are opened / closed by driving of the cylinders 7a. It is comprised so that it can throw in into the lower weighing tank 8.

  The weighing tank 8 measures the charged aggregate with a load cell, and sends the measured value to a control unit 25 (see FIG. 7) described later. In addition, as shown in FIG. 3, the measuring tank 8 includes a measuring tank 8a, 8b for aggregates (fine aggregate, coarse aggregate), a measuring tank (8c, 8d, etc.) are provided, and each weighing tank 8 is configured so that necessary materials are measured.

  An open / close gate 9 and a drive cylinder 10 for the open / close gate 9 are provided in the lower part of the measuring tank 8. After the measurement, the open / close gate 9 is opened and measured by the cylinder 10 under the control of the control unit 25. Raw material such as aggregate is put into the lower mixer 11.

  In addition, as described above, in each measuring tank for measuring cement, water, admixture, admixture, etc., when the raw materials measured by each measuring machine reach a predetermined measuring value, According to a predetermined order, the open / close gate 9 is opened, and raw materials are manufactured by putting each raw material into the lower mixer 11 and kneading.

  The produced ready-mixed concrete is put into the lower hopper 12 of the mixer 11 and loaded into the ready-mixed vehicle 30 from the outlet 13 of the loading hopper 12 via the loaded hopper or the like.

Next, the configuration of the lightweight aggregate supply device according to the present invention will be described.
14 is a lightweight aggregate hopper installed on the ground G adjacent to the above-mentioned ready-mixed concrete production plant 1, and the lightweight aggregate after addition of water is put inside.

  As shown in FIG. 6, the lightweight aggregate is stored in a lightweight aggregate storage tank 15 with a watering facility 15 a in a conventional aggregate storage yard. When using an aggregate with a high water supply rate such as a lightweight aggregate, water is uniformly supplied to the lightweight aggregate 31 in the lightweight aggregate storage tank 15 in advance from the watering equipment 15a in advance. Need to wet (prewetting). Since lightweight aggregate has a very high water supply rate, water will not penetrate into the aggregate unless water is absorbed sufficiently. Therefore, before use, water is sprayed by the watering equipment, and for example, the water is sufficiently absorbed until the aggregate is wet.

Here, the lightweight aggregate is an aggregate used for the production of ready-mixed concrete, and includes both natural lightweight aggregates such as pumice and volcanic gravel, and artificial lightweight aggregates. The lightweight aggregate in the present invention is a lightweight aggregate defined in, for example, JIS A 5002 (structural lightweight concrete aggregate), that is, an absolute dry density (g / cm ³ ) (that is, specific gravity) is “fine aggregate”. In the case of “L”, the division L is less than 1.3, the division M is 1.3 or more and less than 1.8, the division H is 1.8 or more and less than 2.3. L is less than 1.0, section M is 1.0 or more and less than 1.5, and section H is 1.5 or more and less than 2.0. In raw concrete JIS, it is said that, among the lightweight concrete aggregates for construction, only the sections M and H based on the absolute dry density can be used for the artificial lightweight aggregate. Incidentally, the density of ordinary aggregate is about 2.40 to 2.80 (g / cm ³ ), and the density of heavy aggregate is 3.0 (g / cm ³ ) or more.

  The aggregate storage tank 15 is provided with a water outlet 15 b on the bottom surface thereof, and is configured to spray water on the lightweight aggregate 31 stored in the storage tank 15. And it is comprised so that a required quantity can be thrown into the said lightweight aggregate hopper 14 from the said lightweight aggregate storage tank 15 with the screw conveyor 15c for conveyance (refer FIG. 6, FIG. 2).

  The lightweight aggregate hopper 14 is installed on the ground G by the machine frame 16, and the screw conveyor 17 is connected to the hopper so that the starting end 17 a of the screw conveyor 17 is located below the outlet 14 a at the lower part. 14 is provided horizontally at a lower end, and a terminal end 17b of the screw conveyor 17 is connected to a lower inlet 18a of a known bucket elevator (elevating and lowering conveying means) 18 (see FIG. 2).

  A casing 18 ′ of the bucket elevator 18 is provided in the vertical direction adjacent to the ready-mixed concrete production plant 1 and parallel to the casing 2 of the plant 1. The bucket elevator 18 has a known configuration, and a sprocket (see the uppermost sprocket 18b, see FIGS. 2 and 5) is provided in the lowermost and uppermost parts in the casing 18 ′. A chain 32 is hung between the sprockets (see FIG. 5), a plurality of buckets 33 are attached to the chain 32 at regular intervals, and the upper sprocket 18b is driven by a drive motor 28, thereby rotating the chain 32. When driven, the plurality of buckets 33 are rotationally driven from below to above, so that the lightweight aggregate 31 introduced from the insertion port 18a can be conveyed upward.

  The height of the bucket elevator 18 is slightly higher than the lower opening / closing gate 7 of the storage bottles 5a, 5b of the ready-mixed concrete production plant 1 (position higher than the upper opening 8a ″ of the measuring tank 8, that is, the lightweight aggregate 31). ) And a lightweight aggregate 31 from a bucket 33 inverted by the upper sprocket 18b on the side surface of the upper end portion of the casing 18 ′. A chute 19 for feeding to the conveyor 21 is connected (see FIGS. 2 and 5).

  Between the lower opening 19a of the chute 19 and the upper part of the measuring tank 8 of the ready-mixed concrete production plant 1, a forward / reverse screw conveyor 21 that can be driven forward / reversely is provided horizontally. The opening 19a is connected to the upper opening 21a at one end of the screw conveyor 21 (see FIG. 1). The other end 21d of the screw conveyor 21 is provided with a chute 22, and the lower opening 22a of the chute 22 is connected to the upper opening 8a '' of the hopper 8a 'of the weighing tank 8, The lightweight aggregate 31 is configured so that it can be directly put into the measuring tank 8 (see FIG. 4).

  Accordingly, when the bucket 33 is reversed by the upper sprocket 18b of the bucket elevator 18, the lightweight aggregate 31 in the bucket 33 is introduced into the forward / reverse screw conveyor 21 through the chute 19 from the upper opening 21a, The screw conveyor 21 is forwardly rotated to the other end 21d of the conveyor 21 so that the lightweight aggregate 31 can be put into the measuring tank 8 through the chute 22. .

  One end of the forward / reverse screw conveyor 21 has an extension 21b that extends from the upper opening 21a to the opposite side of the ready-mixed concrete production plant 1 (FIGS. 1 and 3). reference). A lower opening 21c is formed at the end of the extension 21b (see FIG. 1), and an upper end opening 23a of a chute pipe (conveying means) 23 is connected to the lower opening 21c. The other end opening (lower end opening) 23b of the pipe 23 is connected to the upper opening 14b of the lightweight aggregate hopper 14 (see FIG. 1 and FIG. 2, FIG. 2 shows the chute pipe 23 by a one-dot chain line). .

  After a predetermined amount of the lightweight aggregate 31 is put into the measuring tank 8 by forward rotation of the forward / reverse screw conveyor 21, the lightweight aggregate remaining in the screw conveyor 21 is reversed with respect to the forward / reverse screw conveyor 21. Thereby, it conveys to the reverse direction of this forward / reverse screw conveyor 21, and it is comprised so that it can throw in in the said chute | pipe 23 from the lower opening part 21c of the said extension part 21b.

  The chute pipe 23 is composed of a cylindrical chute, and the lightweight aggregate introduced into the chute pipe 23 from the upper end opening 23a descends by its own weight in the chute pipe 23, and the lower end opening. The lightweight aggregate hopper 14 is inserted into the lightweight aggregate hopper 14 from 23b, and the lightweight aggregate 31 can be returned into the lightweight aggregate hopper 14. The chute pipe 23 may be a conveying means such as a conveyor or a bucket elevator.

  As described above, the lightweight aggregate supply device according to the present invention is supplied from the lightweight aggregate lightweight hopper 14 to the measuring tank 8 and then from the forward / reverse screw conveyor 21 to the lightweight aggregate hopper 14. The circulation route is formed, and the lightweight aggregate is constantly circulated in the above route to prevent solidification (dead stock) due to storage (stationary) in one place as before. In addition, it is configured so that a necessary amount of lightweight aggregate can always be used. Further, if necessary, the light aggregate that has been pre-wet can be introduced into the lightweight aggregate hopper 14 from the lightweight aggregate storage tank 15 by the screw conveyor 15c for conveyance. It is possible to replenish fresh lightweight aggregate after it has been prewetting.

  FIG. 7 is an electrical block diagram of a control device for driving and controlling the lightweight aggregate supply device. These devices are in a control chamber (not shown) provided adjacent to the casing 2. Is provided. In the figure, reference numeral 25 denotes a control unit which drives a drive motor 26 of the screw conveyor 17, a forward / reverse drive motor 27 of the forward / reverse screw conveyor 21, and a drive motor 28 of the bucket elevator 18 based on the operation procedure shown in FIG. The forward / reverse screw conveyor 21 is forward / reverse driven controlled based on the weighing data sent from the weighing tank 8. Reference numeral 29 denotes an operation panel.

  Next, the operation of the embodiment of the lightweight aggregate supply device according to the present invention will be described with reference to the flowchart of FIG.

  The lightweight aggregate 31 is housed in the lightweight aggregate storage tank 15 of the aggregate storage yard, and the sprinkler 15a sprays water from the outlet 15b to the entire lightweight aggregate 31 in the tank. It shall be in the prewetting state (henceforth a hydration state).

  When it is necessary to produce ready-mixed concrete containing lightweight aggregate, the conveying screw conveyor 15c is driven to take out the pre-wetting lightweight aggregate from the lightweight aggregate storage tank 15, and the conveying screw conveyor. A predetermined amount of the lightweight aggregate 31 is put into the lightweight aggregate hopper 14 through the upper opening 14b by 15c (see FIG. 2).

  When the lightweight aggregate 31 is put into the lightweight aggregate hopper 14, the controller 25 first drives the bucket elevator drive motor 28 to start driving the bucket elevator 18 (see S1 in FIG. 8). Accordingly, in the casing 18 ′, a circulating operation of raising (lowering in the direction of arrow A) and lowering (in the direction of arrow B) of the plurality of buckets 33 is started.

  Thereafter, the control unit 25 starts driving the loading screw conveyor 17 (see FIG. 8S2), and forwardly drives the forward / reverse drive motor 27 to forwardly drive the forward / reverse screw conveyor 21 (see FIG. 8S3).

  Then, the lightweight aggregate 31 in the lightweight aggregate hopper 14 is introduced into the screw conveyor 17 from the outlet 14a by the screw conveyor 17 and from the inlet port 18a below the bucket elevator 18 from the terminal end portion 17b. It is put into the elevator 18. Since the buckets 33 sequentially arrive at the charging port 18a from below, the lightweight aggregates 31 are sequentially loaded into the bucket 33, and the bucket 33 is lifted (in the direction of arrow A). The lightweight aggregate in the bucket 33 is thrown into the forward / reverse screw conveyor 21 from the upper opening 21a of the forward / reverse screw conveyor 21 through the chute 19 by being inverted by the upper sprocket 18a at the upper end. .

  At this time, since the forward / reverse screw conveyor 21 is driven forward, the charged lightweight aggregate is conveyed toward the front end by the forward rotation of the forward / reverse screw conveyor 21 (arrow C direction), and the forward / reverse screw conveyor 21 is rotated forward. The reverse screw conveyor 21 is introduced into the measuring tank 8 (8a) through the chute 22 from the tip 21d.

  At this timing, the control unit 25 starts weighing (see S4 in FIG. 8), and the measurement value by the load cell of the weighing tank 8 (8a) is sent from the weighing tank 8 (8a) to the control unit 25. The control unit 25 recognizes the measured value from the weighing tank 8 (8a) and maintains the forward / reverse driving of the forward / reverse screw conveyor 21 until the necessary measured value is reached (see S4 and S5 in FIG. 8). In this case, it is assumed that the measurement value of the lightweight aggregate is input in advance to the control unit 25 from the operation panel 29, and is stored and grasped in the data memory by the control unit 25 as the reference measurement value.

  When the controller 25 recognizes that the measured value of the lightweight aggregate 31 matches the value stored in advance in the data memory, the controller 25 stops the forward drive of the drive motor 27 of the forward / reverse screw conveyor 21 ( Immediately, the forward / reverse drive motor 27 starts to reversely rotate (see S6 and S7 in FIG. 8). When the forward / reverse screw conveyor 21 is stopped, the required lightweight aggregate is accurately measured in the measuring tank 8 (8a).

  In the meantime, in the ready-mixed concrete production plant 1, normal control is performed, and other necessary aggregates, cement, water, admixture, etc. are measured in the measuring tank 8, and then the measuring tank 8 is used. Is fed to the mixer 11, and after stirring in the mixer 11, ready-mixed concrete using a predetermined amount of lightweight aggregate is manufactured.

  When the measuring operation is finished and the forward / reverse screw conveyor 21 is driven reversely after the stop, the measured aggregate 31 remaining from the upper opening 21a to the tip 21d is in the reverse direction. It is transported in the direction of arrow D and fed into the chute pipe 23 from the lower opening 21c of the extension 21b of the forward / reverse screw conveyor 21.

  At this time, the lightweight aggregate 31 is sequentially conveyed upward by the bucket elevator 18 and turned upside down to be fed into the forward / reverse screw conveyor 21 from the upper opening 21a. Since 21 is reversely driven, the lightweight aggregate newly put into the forward / reverse screw conveyor 21 is also conveyed in the reverse direction (arrow D direction), and sequentially from the lower opening 21c of the extension 21b, It is thrown into the chute pipe 23.

  The lightweight aggregate 31 introduced into the chute pipe 23 descends through the chute pipe 23 and is introduced into the lightweight aggregate hopper 14 from the lower end 23b. Therefore, at this time, the lightweight aggregate is returned to the lightweight aggregate hopper 14 via the chute pipe 23 and circulates again through the circulation path of the screw conveyor 17, bucket elevator 18, and forward / reverse screw conveyor 21.

  The control unit 25 detects whether or not there is a next weighing command (see S8 in FIG. 8). If there is a next weighing command, the control unit 25 returns to step S3 to drive the forward / reverse screw conveyor 21 in the forward direction ( (See FIG. 8 S3).

  Accordingly, the lightweight aggregate 31 introduced from the upper opening 21a into the forward / reverse screw conveyor 21 from the bucket elevator 18 is conveyed in the forward direction (arrow C direction), and from the tip end portion 21d via the chute 22 to the measuring tank 8. (8a) (see FIG. 8 S3). At this timing, the control unit 25 starts weighing, and the measurement value by the load cell of the measurement tank 8 (8a) is sent from the measurement tank 8 (8a) to the control unit 25. The control unit 25 recognizes the measured value from the weighing tank 8 (8a) and maintains the forward / reverse driving of the forward / reverse screw conveyor 21 until the necessary measured value is reached (see S4 and S5 in FIG. 8).

  When the control unit 25 recognizes that the measured value of the measured aggregate coincides with the value stored in advance in the data memory, the forward rotation of the drive motor 27 of the forward / reverse screw conveyor 21 is performed. The driving is stopped (see S6 in FIG. 8), and the forward / reverse driving motor 27 is immediately started in reverse rotation (see S7 in FIG. 8). When the forward / reverse screw conveyor 21 is stopped, the required lightweight aggregate is accurately measured in the measuring tank 8 (8a).

  Then, as long as the next measurement operation continues, the control unit 25 can continuously perform the measurement operation of the measurement aggregate 31 by repeatedly performing the operations from step S3 to step S8 in FIG.

  At this time, the lightweight aggregate 31 is weighed from the lightweight aggregate hopper 14 via the screw conveyor 17 and lifted by the bucket elevator 18, and only necessary measurement values are directly measured via the forward / reverse screw conveyor 21. Since the lightweight aggregate remaining in the tank 8 (8a) is returned to the lightweight aggregate hopper 14 by the chute pipe 23, the lightweight aggregate 31 is stored in the storage tank or the like for a long time (stopped). The lightweight aggregate that is not necessary for measurement and is not required for measurement is a lightweight aggregate that can be continuously circulated between the lightweight aggregate hopper 14 and the forward / reverse screw conveyor 21 and is prewetting. Without solidifying, it is possible to take out only a necessary amount of the measured aggregate and use it.

  Accordingly, when the control unit 25 determines that there is no next weighing operation (see S8 and S9 in FIG. 8), the control unit 25 returns to step S7 and continues the reverse rotation operation of the forward / reverse screw conveyor 21 (see FIG. 8 S9). Accordingly, when there is no next weighing operation, the forward / reverse screw conveyor 21 is driven in reverse, so that the lightweight aggregate 31 that has been lifted by the bucket elevator 18 is moved in the reverse direction by the forward / reverse screw conveyor 21. It is conveyed and can be lowered in the chute pipe 23 and returned to the lightweight aggregate hopper 14.

  Therefore, even if the next weighing operation is not performed, the lightweight aggregate is transferred from the lightweight aggregate hopper 14 via the screw conveyor 17, bucket elevator 18, forward / reverse screw conveyor 21, and chute pipe 23. Therefore, the light weight aggregate is not stored in one place in the aggregate storage bottle for a long time. Without solidification, it can be taken out at any time and kept in a measurable state.

  In this lightweight aggregate circulation state, when the control unit 25 receives a command with a weighing operation (see S8 in FIG. 8), the control unit 25 always returns to step S3 and rotates the forward / reverse screw conveyor 21 to start the weighing operation. can do.

  When there is no next metering, the control unit 25 determines whether or not the process can be further terminated. When the process is terminated, the control motor 25 of the loading screw conveyor 17 and the forward / reverse screw conveyor 21 The driving of the forward / reverse drive motor 27 and the drive motor 28 of the bucket elevator 18 is stopped (see S10, S11, S12 in FIG. 8), and the process ends.

  In the control of the above embodiment, the forward / reverse screw conveyor 21 is stopped and reversed at the end of the measurement in step S5. However, this is separated from the measurement operation, and the lightweight aggregate is put into the measurement tank 8 and the measurement is performed. When it is detected by a sensor or the like that the lightweight aggregate in the tank 8 has reached a predetermined amount (for example, full), the forward / reverse screw conveyor 21 is configured to stop and reverse, and in steps S8 and S9, When the amount of the lightweight aggregate in the measuring tank 8 is not more than a predetermined amount, not a command for the next weighing operation, this is detected by a sensor or the like, and the forward / reverse screw conveyor 21 is rotated forward to measure the weighing tank 8. It may be configured such that lightweight aggregate can be charged (supplemented). In the case of this embodiment, the weighing operation of the lightweight aggregate in the measuring tank 8 and the supply operation of the lightweight aggregate can be separated. When the light aggregate in the light aggregate hopper 14 is reduced by repeating the above operation, the control unit 25 drives the conveying screw conveyor 15c to freshly prewet the light aggregate storage tank 15. Lightweight aggregate can be refilled into the lightweight aggregate hopper 14 at any time.

  As described above, according to the present invention, it is possible to use the light weight aggregate that has been hydrated, for example, by directly adding the necessary amount to the measuring tank 8 and measuring it. The lightweight aggregate is transported by the reverse of the second transport conveyor (forward / reverse screw conveyor 21), the transport means (chute pipe 23), the lightweight aggregate hopper 14, the first transport conveyor (screw conveyor 17), the lift transport means (bucket elevator). 18) The route of the second conveyor (forward / reverse screw conveyor 21) can be circulated, and solidification of the lightweight aggregate (dead stock) by keeping it in a storage tank or the like for a long time. The required amount of lightweight aggregate can be used at any time.

  Moreover, it can be added appropriately in the aggregate storage tank 15 in the lightweight aggregate storage yard, and a necessary amount of lightweight aggregate is appropriately transferred to the lightweight aggregate hopper 14 by the third transport conveyor (transport screw conveyor 15c). Can be incorporated. In FIG. 6, 34 is a watering pump.

  According to the lightweight aggregate supply device of the present invention, a light-weight aggregate that has been difficult to handle due to solidification in the ready-mixed concrete production plant can be easily handled and is extremely effective.

DESCRIPTION OF SYMBOLS 1 Ready-mixed concrete production plant 8 Measuring tank 14 Lightweight aggregate hopper 15 Aggregate storage tank 15 Sprinkling equipment 15c Screw conveyor for conveyance (3rd conveyance conveyor)
17 Screw conveyor (first conveyor)
18 Bucket elevator (lifting and lowering means)
21 Forward / reverse screw conveyor (second conveyor)
23 Chute pipe (conveying means)

Claims (5)

A lightweight aggregate supply device for supplying lightweight aggregate to a ready-mixed concrete manufacturing plant,
A lightweight aggregate hopper is provided to accept the hydrated lightweight aggregate;
A first conveyor is provided to carry out the lightweight aggregate from the lightweight aggregate hopper;
Elevating and lowering conveying means for conveying the lightweight aggregate carried out by the first carry-out conveyor to a height at which it can be supplied to the weighing tank of the ready-mixed concrete production plant is provided,
A second conveyor that receives the lightweight aggregate conveyed by the elevating and conveying means from the upper opening is provided, and the second conveyor is connected to the measuring tank at its tip and is rotated forward. The necessary amount of light aggregate transported by the lifting and transporting means is directly put into the measuring tank from the front end portion , and is reversed so that the second transport conveyor enters the second transport conveyor. which carry the lightweight aggregate remaining in the opposite direction,
Conveying means for connecting the lower opening of the end of the second conveying conveyor on the reverse conveying side and the lightweight aggregate hopper is provided, and the conveying means is configured by reversing the second conveying conveyor. The lightweight aggregate remaining in the second transport conveyor is input from the lower opening, and the lightweight aggregate input from the lower opening is returned to the lightweight aggregate hopper. Material supply device. The light weight aggregate that has been hydrated is one that has been hydrated in an aggregate storage tank having watering equipment in the aggregate storage yard.
The lightweight aggregate supply apparatus according to claim 1, wherein the lightweight aggregate is conveyed from the aggregate storage tank to the lightweight aggregate hopper by a third conveyor.   The lightweight aggregate supply device according to claim 1 or 2, wherein the first conveyor and the second conveyor are each constituted by a screw conveyor.   The lightweight aggregate supply apparatus according to any one of claims 1 to 3, wherein the elevating / conveying means is a bucket elevator. A lightweight aggregate supply method using the lightweight aggregate supply device according to claim 1,
Accepts lightweight aggregate hydrated with the above lightweight aggregate hopper,
The lightweight aggregate material is unloaded at the first conveyance conveyor from the lightweight aggregate hopper,
Conveying the lightweight aggregate is carried out by the first conveyance conveyor to a height capable of supplying the measuring tank the raw concrete manufacturing plant in the elevator conveying means,
By rotating the second conveyor forward , a required amount of the lightweight aggregate received from the lifting and conveying means is put into the measuring tank, and the lightweight aggregate is metered in the measuring tank. And
By reversing the second transport conveyor, transport the lightweight aggregate remaining in the second transport conveyor in the reverse direction,
The remaining light-weight aggregate transported in the reverse direction by the second transport conveyor being reversed is put into the transport means, and returned to the light-weight aggregate hopper through the transport means , so that the residual Supply of lightweight aggregate such that lightweight aggregate is circulated to the lightweight aggregate hopper via the lightweight aggregate hopper, the first transport conveyor, the lifting transport means, the second transport conveyor, and the transport means. Method.

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