JP2019043100A - Fiber charging device and method for cement mixture - Google Patents

Abstract

To provide a fiber charging device and a fiber charging method for a cement mixture where a fiber for reinforcement is mixed into a ceramic mixture.SOLUTION: Provided is a fiber charging device for a cement mixture comprises: a tip part 11a inserted into a drum 2; a receiving part 11b connected to the tip part 11a and gradually narrowly formed toward the discharge direction D of a liquid; and an air nozzle 12 jetting compressed air toward a fiber for reinforcement charged to the inside of the receiving part 11b.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an apparatus and method for injecting a mixture of fibers into a cement mixture, and more particularly to an apparatus and method for mixing reinforcing fibers into a mixture of cement loaded on an agitator.

  A cement mixture such as concrete or mortar is produced in a concrete plant and then loaded on an agitator car and transported to a placement site.

  For such a cement mixture, it is widely known to knead admixtures such as thickeners and reinforcing fibers with the cement mixture in order to improve the workability and the strength of the cement mixture. The addition and mixing operations of such admixtures may be performed at the casting site. Specifically, after the admixture is charged into the drum of the agitator wheel, the drum is rotated to stir and mix the cement mixture and the admixture.

  Patent Document 1 discloses a feeding device for feeding a powder admixture into a drum of an agitator vehicle. Such a feeding device includes a funnel portion fitted to the drum inlet of the agitator vehicle, and a chute portion which can be inserted into the drum continuously to the funnel portion. Also, the chute portion is drawn so as to be able to be charged with the powder admixture to the bottom of the drum where the cement mixture is located.

JP, 2015-123693, A

  However, when reinforcing fibers are added to and mixed with a cement mixture using the feeding device disclosed in Patent Document 1, the reinforcing fibers fall within the cement mixture when the density of the fibers decreases and the amount of reinforcing fibers added increases. May form entangled massive fiber balls.

  In such a fiber ball, since the cement and the aggregate do not penetrate properly to the inside, there is a possibility that the quality of the fiber reinforced concrete produced by kneading the cement mixture and the reinforcing fiber may be significantly reduced.

  Then, the technical subject which should be solved in order to mix the fiber for reinforcement in a cement mixture arises, and an object of the present invention is to solve this subject.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a fiber feeding device for feeding reinforcing fibers into a drum of an agitator car, which can be inserted into the drum A fiber input of a cement mixture comprising: a feeding pipe for dropping the reinforcing fiber toward the cement mixture in the drum; and a fluid discharge means for discharging a fluid toward the reinforcing fiber in the feeding pipe Provide an apparatus.

  According to this configuration, the fluid discharged by the fluid discharge device is biased toward the drum while disengaging the reinforcing fibers, whereby the fine reinforcing fibers are locally localized in the cement mixture located at the bottom of the drum. Because the particles are dispersed without being mixed, the generation of fiber balls can be suppressed.

  In addition to the structure of the invention of claim 1, the invention according to claim 2 provides a fiber injection apparatus of a cement mixture in which the injection pipe discharges the fluid along the longitudinal direction of the injection pipe.

  According to this configuration, since the direction in which the reinforcing fiber slides down into the feeding pipe coincides with the direction in which the fluid discharge means biases the reinforcing fiber, the reinforcing fiber can be efficiently biased.

  The invention according to claim 3 provides, in addition to the constitution of the invention according to claim 1 or 2, the fiber feeding device for a cement mixture in which the fluid is compressed air.

  According to this configuration, the reinforcing fiber in a dry state can be added to the cement mixture, and the generation of fiber balls can be suppressed while maintaining the water content of the cement mixture.

  In the invention according to a fourth aspect, in addition to the configuration according to any one of the first to third aspects, the feeding pipe can receive a tip end portion inserted into the drum, and the reinforcing fiber. And a receiving portion connected to the tip end and formed to have a gradually narrowing width in the discharge direction of the fluid.

  According to this configuration, the reinforcing fiber randomly introduced into the large diameter opening is finely divided by the fluid in the receiving part and biased by the fluid as it moves from the receiving part to the small diameter tip. Therefore, fine reinforcing fibers can be efficiently introduced into the cement mixture located at the bottom of the drum, and the generation of fiber balls can be suppressed.

  The invention according to claim 5 is a fiber charging method for charging reinforcing fibers into a drum of an agitator car, wherein the reinforcing fibers are directed toward the cement mixture in the drum through a charging pipe inserted into the drum. A fiber input method of a cement mixture is provided, including a step of charging and a step of discharging a fluid toward reinforcing fibers in a charging pipe.

  According to this configuration, the fluid discharged by the fluid discharge device is biased toward the drum while disengaging the reinforcing fibers, whereby the fine reinforcing fibers are locally localized in the cement mixture located at the bottom of the drum. Because the particles are dispersed without being mixed, the generation of fiber balls can be suppressed.

  According to the present invention, the fluid discharged by the fluid discharge means is locally biased in the cement mixture located at the bottom of the drum by biasing the fluid discharged from the fluid discharge means toward the drum while disengaging the reinforcing fibers. Without being mixed and mixed, it is possible to obtain high quality fiber reinforced concrete in which the cement mixture and the reinforcing fibers are sufficiently kneaded.

BRIEF DESCRIPTION OF THE DRAWINGS The partial cross-section front view which shows the structure of the agitator vehicle which applies the fiber injection | throwing-in apparatus of the cement mixture which concerns on one Example of this invention. The bottom view and front view of the fiber injection | throwing-in apparatus of the cement mixture shown in FIG. The bottom view and front view which show the flow of the compressed air in the fiber injection | throwing-in apparatus of a cement mixture. The schematic diagram which shows a mode that the fiber for reinforcement is thrown in in a drum.

  SUMMARY OF THE INVENTION The present invention is a fiber input device for a cement mixture, wherein the reinforcing fibers are introduced into the drum of the agitator car to achieve the purpose of incorporating the reinforcing fibers into the cement mixture, which can be inserted into the drum. This is achieved by providing a feeding pipe for dropping reinforcing fibers toward the cement mixture in the drum, and a fluid discharging means for discharging a fluid toward the reinforcing fibers in the loading pipe.

  Further, the present invention is a method for introducing a fiber of a cement mixture into which a fiber for reinforcement is injected into a drum of an agitator car to achieve the purpose of mixing the fiber for reinforcement into a cement mixture, and the fiber is inserted into the drum. This is realized by including the steps of: dropping reinforcing fibers toward the cement mixture in the drum via the charging pipe; and discharging fluid toward the reinforcing fibers in the charging pipe.

  Hereinafter, a fiber charging apparatus (hereinafter, referred to as a "fiber charging apparatus") 10 of a cement mixture according to an embodiment of the present invention will be described based on the drawings. In the following examples, when referring to the number, numerical value, amount, range, etc. of constituent elements, unless specifically indicated otherwise and in principle when clearly limited to a specific number, The number is not limited and may be more or less than a specific number.

  In addition, when referring to the shapes of components, etc., and positional relationships, those that are substantially similar or similar to the shapes etc., unless specifically stated otherwise or where it is considered to be otherwise clearly apparent in principle Including.

  In the drawings, characteristic parts may be enlarged or enlarged to make features easy to understand, and dimensional ratios of constituent elements are not necessarily the same as in actuality. In addition, in the cross-sectional view, hatching of some components may be omitted in order to make the cross-sectional structure of the components intelligible.

  FIG. 1 is a front view, partly in section, showing an agitator 1 to which a fiber feeding device 10 is applied. FIG. 2A is a bottom view showing the fiber feeding device 10. FIG. 2 (b) is a front view showing the fiber feeding device 10.

  The agitator vehicle 1 loads the cement mixture C manufactured by the concrete plant on the drum 2 and transports it to the placement site. The cement mixture C is obtained by mixing and kneading cement, water and aggregate in an arbitrary ratio. The agitator vehicle 1 has a known configuration.

  A stirring blade 3 is provided on the inner periphery of the drum 2. As the drum 2 rotates, the stirring blades 3 knead the cement mixture C.

  A fiber feeding device 10 for feeding reinforcing fibers is attached to the feeding port 2 a of the drum 2. The reinforcing fibers accommodated in the fiber hopper 4 are injected into the fiber input device 10 through the belt conveyor 5.

  The belt conveyor 5 is provided with a windproof cover (not shown) in order to prevent scattering of reinforcing fibers during conveyance by wind. The reinforcing fibers are not limited to those fed to the fiber feeding device 10 by the belt conveyor 5 but may be manually fed to the fiber feeding device 10 by an operator. Further, the belt conveyor 5 is supported by the legs 5a. The length and angle of the legs 5 a can be arbitrarily changed, and the height and position of the belt conveyor 5 can be adjusted according to the agitator wheel 1.

  The fiber feeding device 10 includes a feeding pipe 11 and an air nozzle 12 as a fluid discharge unit. The input pipe 11 is provided with a tip end portion 11 a and a receiving portion 11 b. The total length l1 of the input pipe 11 viewed from the bottom is set to about 90 cm.

  The tip 11 a is inserted into the drum 2. The tip 11a is formed in a cylindrical shape. The front end portion 11 a is not limited to one extended in the longitudinal direction L, and may be bent or curved according to the shape of the drum 2. The inner diameter of the tip 11a is preferably 100 to 300 mm. Moreover, it is preferable that the length of the tip part 11a is set to 0.1 to 2.0 m. When the length of the tip 11a is shorter than 0.1 m, reinforcing fibers introduced from the tip 11a into the drum 2 are easily accumulated in the bottom of the drum 2 where the cement mixture C is located. The inner diameter d1 of the tip 11a is set to 20 cm, and the length l2 is set to 30 cm.

  The receiving portion 11 b is formed in a funnel shape. One end of the receiving portion 11 b formed in a small diameter is in communication with the tip end 11 a. An opening 11 c is formed at the other end of the receiving portion 11 b formed to have a large diameter. Further, the inner diameter d2 of the opening 11c is set to 60 cm, and the length l3 is set to about 70 cm.

  The input amount of reinforcing fibers supplied from the belt conveyor 5 to the input pipe 11 is appropriately adjusted according to the desired strength and the like to be applied to the cement mixture C. The fiber input amount is set at 10 kg / min or less, preferably at 6 kg / min or less. In the present embodiment, the fiber input amount is set to 4.0 kg / min.

  The reinforcing fibers are widely used as fibers to be mixed into the cement mixture C, and examples thereof include organic fibers such as vinylon, polypropylene, polyethylene, and aramid, and inorganic fibers such as carbon, glass, and steel.

  The air nozzle 12 discharges compressed air along the inner circumferential surface of the receiving portion 11b. The air nozzle 12 is connected to a compressor (not shown). The mounting position of the air nozzle 12 may be the peripheral edge of the opening 11 c or the tip of the belt conveyor 5. Compressed air is discharged along the longitudinal direction L of the feed pipe 11.

  The compressed air may be discharged so as to be inclined in the width direction W and the vertical direction V perpendicular to the longitudinal direction L of the input pipe 11. Thereby, the flow of compressed air can be changed into an arbitrary shape (for example, a spiral along the inner peripheral surface of the receiving portion 11b) in the receiving portion 11b. The inclination of the air nozzle 12 in the width direction W with respect to the longitudinal direction L is preferably 0 to 70 °. The inclination of the air nozzle 12 in the vertical direction V with respect to the longitudinal direction L is preferably 0 to 85 °. Moreover, the installation number of the air nozzle 12 is not limited to one, You may be provided with two or more.

  The pressure and flow rate of the compressed air which the air nozzle 12 discharges can be suitably adjusted according to the injection amount of the fiber for reinforcement. The pressure of the compressed air is set to 0.5 to 1.5 Mpa, preferably to 0.6 to 1.0 Mpa. In this embodiment, the pressure of the compressed air is set to 0.7 Mpa, and the flow rate of the compressed air is set to 2 to 3 m 3 / minute. The fluid discharged by the fluid discharge means is not limited to compressed air.

  Next, the operation of the fiber feeding device 10 will be described based on the drawings. FIG. 3A is a bottom view showing the flow of compressed air in the fiber feeding device 10. FIG. 3 (b) is a front view showing the flow of compressed air in the fiber feeding device 10. FIG. 4 is a schematic view showing how reinforcing fibers are introduced into the drum 2.

  When the air nozzle 12 is activated, a flow of compressed air is formed in the input pipe 11. In the present embodiment, the air nozzle 12 is disposed so as to discharge the compressed air along the longitudinal direction L of the input pipe 11, and the compressed air as shown by the arrows in FIGS. 3 (a) and 3 (b). A flow is formed.

  Next, when the belt conveyor 5 is activated, reinforcing fibers are introduced into the receiving portion 11b through the opening 11c. The reinforcing fibers randomly introduced from the belt conveyor 5 are an assembly in which fine fibers are intertwined with each other, and are finely divided by the flow of compressed air in the receiving portion 11b. Further, the reinforcing fibers are vigorously transferred from the receiving portion 11b toward the tip portion 11a by being biased by the compressed air.

  Since the funnel-shaped receiving portion 11b is connected to the tip portion 11a, the flow of compressed air is formed without causing a dead zone at the connection portion between the tip portion 11a and the receiving portion 11b, so that reinforcing fibers Is suppressed.

  Specifically, the diameter of the receiving portion 11b is reduced in the width direction W along the discharge direction D of the compressed air so that the tip portion 11a and the receiving portion 11b are connected smoothly, the tip portion 11a and the receiving portion It is suppressed that a dead zone of a flow of compressed air arises in a connection portion with 11b, and it is possible to transfer reinforcing fibers in the receiving portion 11b to the drum 2 without leakage.

  Further, by forming the tip end portion 11a to have an inner diameter of 100 to 300 mm, it is possible to suppress that the reinforcing fiber is unnecessarily stagnated at the connection portion between the tip end portion 11a and the receiving portion 11b.

  Then, the reinforcing fibers are vigorously dropped from the tip 11a into the drum 2 so as to reach the cement mixture C located at the bottom of the drum 2 along a locus shown by the arrow in FIG. By using compressed air, reinforcing fibers can be introduced into cement mixture C in a dry state, and the water content of cement mixture C can be maintained before and after the introduction of reinforcing fibers.

  As the drum 2 rotates, the stirring blade 3 mixes the cement mixture C with the reinforcing fiber. The reinforcing fibers are preferably introduced into the drum 2 while the drum 2 is rotating. As a result, the reinforcing fibers are mixed into the cement mixture C without being locally deposited in the drum 2, so the generation of fiber balls can be further suppressed.

  Thus, in the fiber feeding device 10 according to the present embodiment, the compressed air is finely disintegrated in the receiving portion 11b for the reinforcing fiber, which is thrown into the opening portion 11c having a large diameter without intention, and the receiving portion 11b The fine reinforcing fibers are dispersed and introduced into the cement mixture C located at the bottom of the drum 2 without being localized locally by being biased as it moves from the tip to the small diameter tip 11a. As a result, the generation of massive fiber balls is suppressed, and high-quality fiber-reinforced concrete in which the cement mixture C and the reinforcing fibers are sufficiently kneaded can be obtained.

  Moreover, the present invention can be modified in various ways without departing from the spirit of the present invention other than those described above, and it goes without saying that the present invention extends to those modified.

1 ... agitator wheel 2 ... drum 3 ... stirring blade 4 ... fiber hopper 5 ... belt conveyor 10 ... fiber insertion device 11 ... feeding pipe 11a ... front end of the cement mixture Portion 11b: Receiving portion 11c: Opening 12: Air nozzle (fluid discharge means)

Claims (5)

What is claimed is: 1. A fiber input device for a cement mixture for inserting reinforcing fibers into the drum of an agitator car, comprising:
A feeding tube which can be inserted into the drum and which drops the reinforcing fibers towards the cement mixture in the drum;
Fluid discharge means for discharging fluid toward reinforcing fibers in the input pipe;
A fiber input device for a cement mixture, comprising:   The fiber input device for a cement mixture according to claim 1, wherein the input pipe discharges the fluid along a longitudinal direction of the input pipe.   The fiber feeding device for a cement mixture according to claim 1 or 2, wherein the fluid is compressed air. The input pipe is
A tip inserted into the drum;
A receiving portion provided with an opening capable of receiving the reinforcing fiber and connected to the tip and formed to have a gradually narrow width in the discharge direction of the fluid;
The fiber input device for a cement mixture according to any one of claims 1 to 3, further comprising: A fiber injection method of a cement mixture in which reinforcing fibers are injected into a drum of an agitator car,
Dropping the reinforcing fibers toward the cement mixture in the drum via a feeding pipe inserted into the drum;
Discharging the fluid towards the reinforcing fibers in the input pipe;
A method of fiber injection of a cement mixture comprising: