JP2000145145A - Material supply equipment and spray machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit safe spray work or the like safely and also long-distance carriage by permitting quantitative and continuous mixture of a desired amount of spraying material with carrying air thereby making the rise of spraying machine easier, and eliminating the clogging, twist, meandering and pulsation in discharge. SOLUTION: This material supply equipment comprises a carrying cylinder 10 having a cylindrical internal shape with a material tank 1 attached at one end, a screw 12 stored in a freely rotatable manner in a mixing pipe, a rotation mechanism which rotates the screw 12 and sends a material introduced to one end side of the carrying cylinder 10 from the material tank 1 to other end side of the carrying cylinder 10, a pressured air introducing piping 22a for sending pressured air 22, 23 to other end portion of the carrying cylinder 10 to which the material is sent by the rotation of the screw 12, and discharge pipe connected to a carrying hose 7 for sending the material sent out by pressured air 22 to the carrying cylinder 10. Then, this material supply equipment is used for a spray machine spraying the concrete material and the spray material is discharged from a discharge nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material supply device for constantly supplying a concrete material or the like at a desired flow rate, and a spraying machine for receiving the material from the material supply device to a transfer hose and discharging the material from a nozzle. More specifically, a material supply device that constantly conveys a required amount while finely mixing a fine granular material such as a mixture of cement and aggregate in a wet or dry system, and a spraying machine using the same About.

[0002]

2. Description of the Related Art In the field of civil engineering, for example, a material made of a mixture of cement and aggregate is used to reinforce a slope (slope) of a mark obtained by cutting a ground for laying a road or a railway. Is sprayed on the slope. In addition, primary lining of tunnels, facing of earth and rock walls, brickwork,
Similar spraying works are widely used for coating masonry and concrete surfaces, reinforcing and repairing various concrete structures, and the like.

[0003] In such a spraying work, aggregates such as cement and sand necessary for spraying and water are put into a material tank of a spraying machine, and the spraying material is pushed from a discharge port of the material tank by pressure applied to the material. The material is transported by a flow of transport air formed by pressurized air to a flexible transfer hose. The material is conveyed to a spray nozzle through a transfer hose, and the material is discharged from the spray nozzle and sprayed.

[0004] In the conventional spraying machine, as shown in FIG. 4, after the spraying material is charged into the material tank 1 from the charging port 5, the charging port is closed, and the blowing port is closed via a pressure air introducing pipe having a valve 2. The pressurized air 3 is introduced into the material tank 1. The discharge port 4 at the lower part of the material tank 1 is
Connected to.

[0005] The material in the material tank 1 is dropped into the mixing cylinder 6 through the discharge port 4 in the lower part of the material tank 1 due to the pressure difference between the upper part and the lower part in the material tank 1, and the compressed air 3 introduced into the mixing cylinder 6 And is conveyed to a spray nozzle (not shown) through a flexible transfer hose 7. Then, the spray material is discharged from the spray nozzle, and spraying is performed.

[0006]

In the spraying operation using such a conventional spraying machine, the sealability and weight of the sprayed material are determined by the water content of the material, the particle size distribution of the material, and the uniformity of mixing of cement, aggregate and water. It fluctuates constantly due to gender. Even when the spraying material is conveyed at the same pressure, if the sealing property of the material changes, the amount of the material to be injected into the mixing cylinder 6 due to the pressure difference also changes. For example, as the water content increases, the material becomes heavier and the sealing property of the material increases. At this time,
The mixing amount of the material into the mixing cylinder 6 due to the air pressure difference should be reduced, but in the conventional spraying machine, the injection amount of the blowing material into the mixing cylinder 6 increases.

[0007] However, if the blowing material is introduced into the transfer hose 7 through the mixing tube 6 beyond the transfer capacity of the transfer air, the transfer hose 7 is closed. Thereby, work efficiency is reduced. In addition, in the case of spraying work with a poor scaffolding, such as spraying work on a slope, if the spray material is blocked in the transfer hose 7, the transfer hose 7 is twisted or meandering. Also,
Due to fluctuations in the discharge pressure of the spray material discharged from the nozzle,
The reaction force received from the slope fluctuates greatly, which causes pulsation of the transfer hose 7 and, in the worst case, the danger that the spray operator having the spray nozzle is shaken off.

[0008] Further, due to the variation in the particle size distribution of the material and the variation in the uniformity of the mixture of the cement, the aggregate and the water, the amount of the material introduced into the carrier air is not continuous and uniform, but always fluctuates. As a result, the lump of material and air flow irregularly in the transfer hose 7, and pulsation occurs due to fluctuations in the discharge pressure from the spray nozzle. This leads to deterioration of workability.

Further, since the mass of the sprayed material is pushed by the carrier air while clogging the inside of the carrier hose 7,
The flow frictional resistance of the spray material in the transfer hose 7 is large,
Transport over a long transport distance is not possible. When the conveying distance of the spraying material is long, the conveying hose 7 is frequently clogged, so that the working efficiency of the spraying operation is extremely reduced. In particular, the pulsation of the transfer hose 7 puts a heavy burden on the spraying operator, and when the scaffold is poor, an accident may occur in which the spraying operator drops due to the twisting or meandering of the transfer hose 7. Conversely, in order to shorten the conveying distance of the spraying material, the spraying machine must be frequently moved during the spraying work, and there is a problem that the place where the spraying work can be performed is restricted.

In view of the problems of the conventional spraying machine and the material supply apparatus for supplying the material to the conventional spraying machine, the present invention is not affected by the particle size, moisture, uniformity of the mixing, etc. of the spraying material charged into the material tank. The desired amount of material can be quantitatively and continuously mixed with the carrier air, so that the spraying machine can be easily started up, clogging of the material such as a carrier hose,
It is an object of the present invention to provide a material transporting device which can eliminate twisting, meandering, and discharge pulsation, perform a spraying operation or the like safely, and can transport a long distance, and a spraying machine using the same.

[0011]

According to the present invention, as a means for achieving the above-mentioned object, a forced quantitative supply function is provided in place of a delivery method of a spray material by a pressure difference lacking in quantitativeness and reliability. It uses a screw feeder. That is, the screw feeder is connected to the conventionally used material tank 1 so that the amount of material supplied from the material tank 1 can be controlled by adjusting the rotation speed of the screw 12 of the screw feeder. . The rotation of the screw 12 enables the desired spray material to be constantly conveyed, and can be sent out to the conveying hose 7 by the pressure of the compressed air 22 and 23. As a result, the desired spray material mixed with air is constantly transferred to the transfer hose 7.
In this way, the rising time at which spraying and spraying can be started is shortened, the clogging of the hose and the pulsation of the discharge from the spraying nozzle 36 are eliminated, and long-distance conveyance is enabled.

A material supply apparatus according to the present invention receives a material from a material tank 1 containing the material, mixes the material with pressurized air 22 and 23, and conveys the material by the pressure of the pressurized air 22 and 23. 7.
The material supply device includes a transport cylinder 10 having a cylindrical internal shape connected to one end of a material tank 1, a screw 12 rotatably housed in a mixing tube 10, and rotating the screw 12 to rotate the material. A rotating mechanism for feeding the material introduced from the tank 1 to one end of the transfer tube 10 to the other end of the transfer tube 10, and pressurized air is supplied to the other end of the transfer tube 10 to which the material is sent by the rotation of the screw 12. And a discharge pipe 27 connected to the transfer hose 7 and sending out the material sent from the transfer tube 10 by the pressurized air 22 and 23 to the transfer hose 7. .

In such a material supply apparatus, the amount of the material to be fed is determined by the rotation speed of the screw 12, and therefore, the material is fed from one end of the transport cylinder 10 to the other end by the rotation speed of the screw 12. The amount can be controlled. A pressure air introduction pipe 2 for introducing pressure air 22 and 23 as carrier air to the other end of the carrier tube 10.
By connecting 2a, 23a and the discharge pipe 27 for sending out the material sent from the transfer tube 10 to the transfer hose 7, it becomes possible to send a desired amount of material to the target place through the transfer hose 7. As a result, the desired material can be constantly transferred through the transfer hose 7.

By using such a material supply device as a spraying machine for spraying a concrete material, a desired material can be constantly conveyed through the transfer hose 7, and the material is discharged from the nozzle 36 at the tip of the transfer hose 7. The discharge amount and discharge pressure of the material are stabilized. Therefore, pulsation of discharge from the spray nozzle 36 is eliminated, and stable spraying can be performed.

A balance pipe 16 is provided for communicating several places in the longitudinal direction of the transfer tube 10 and for equalizing the internal pressure in the longitudinal direction of the transfer tube 10. This balance pipe 16
Can make the pressure in the transfer tube 10 uniform and stabilize the feeding of the material in the transfer tube 10. Transfer tube 10
A discharge space 17 is formed before the tip of the screw 12 of the first embodiment, and the pressure air introduction pipes 22a and 23a and the discharge pipe 27 are connected to the discharge space 17. Then, the compressed air introduction pipes 22a, 23a of the transport cylinder 10
The feed blade 26 pushes the material back toward the discharge space 17 before the discharge space 17 to which the discharge pipe 27 is connected.
Is provided. Thus, the material is smoothly sent out to the discharge pipe 27 by the pressurized air introduced into the discharge space 17.

Further, a surge space 19 for temporarily storing a material is provided further ahead of the position where the reverse wing 26 of the transport cylinder 10 is provided. Discharge space 1 of transfer tube 10
When a large amount of material is suddenly sent to the side 7, some of the material temporarily enters the surge space 19. When the amount of the material in the discharge space 17 returns to a normal state, the material in the surge space 19 returns to the discharge space 17 by the reciprocating blade 26.
And is sent out from the discharge pipe 27 to the transfer hose 7. This alleviates a sudden supply excess of the material and enables a stable supply of the material.

[0017]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings.
1 and 2 show an embodiment of a material supply apparatus according to the present invention.
Shown in Below the material tank 1 as a pressure vessel, a material receiving port 11 provided on one end side of the transport cylinder 10 is connected via a flange joint. The transfer cylinder 10 has a cylindrical internal space, and has an auger-shaped screw 12 on its central axis.
Is rotatably supported. The proximal end of the screw shaft 13 is rotatably supported by a bearing housed in the shaft sealing portion 9, and the bearing side is sealed by the shaft sealing portion 9 with the inner space of the transport cylinder 10 in a watertight manner. Further, a motor 8 is connected to one end of the screw shaft 13 via a speed reducer 15, and the motor 8 drives the screw shaft 13 to rotate.

The distal end of the screw shaft 13 is not supported and is free, and a reverse feed blade 18 for feeding the material in a direction opposite to the feed when the screw 13 rotates is provided at the distal end. The space where the screw 12 is located in the transfer tube 10 is a mixing space 14, and the space between the screw 12 and the backward feeding blade 18 is a discharge space 17. Further, the portion without the screw shaft 13 ahead of the reverse wing 18 is
A surge space 19 is provided, and an end of the transport cylinder 10 on the surge space 19 side is closed by a lid 20. In the illustrated example, the screw shaft 13 has a one-end support structure in which only one end is supported. However, in order to suppress deflection and runout of the screw shaft 13, both ends where the screw shaft 13 is rotatably supported also on the lid 20 side. A support structure may be employed.

The mixing space 14 and the discharge space 17 of the transport cylinder 10 are connected by a bypass balance pipe 16, and the balance pipe 16 is connected to a plurality of locations of the transport cylinder 10. Pressure air introduction pipes 22a and 23a are connected to one side of the discharge space 17 of the transfer cylinder 10, and the compressed air 22 and 23 are supplied from the compressor (not shown) into the discharge space 17 of the transfer cylinder 10 through the pressure air introduction pipes 22a and 23a. 23 is pumped. Pressure air introduction pipe 2
Flow control valves 21 and 24 are provided in 2a and 23a, respectively, and compressed air 22 introduced into the discharge space 17 is provided.
23 can be adjusted.

A discharge pipe 27 is connected to a lower portion of the other side of the discharge space of the transfer tube 10, and the flexible transfer hose 7 is connected to the discharge pipe 27. This discharge pipe 27
A pressure air introduction port 26 is provided in the middle of the process, and the flow rate of the pressure air introduced from the pressure air introduction port 26 to the discharge pipe 27 is adjusted by the flow rate adjustment valve 25. On the other hand, in the upper part of the material tank 1, there is a charging port 5 for charging a spray material or the like.
A pressure air introduction pipe having a valve 2 is connected to the inlet 5, and pressurized air is introduced into the material tank 1 via the pressure air introduction pipe 2.

Next, the operation of the material supply apparatus having such a configuration will be described together with its use. The discharge port at the lower part of the conventionally used material tank 1 described above is connected to the material receiving port 11 on the base end side of the transport cylinder 10 via a flange joint. In this state, for example, a spray material obtained by mixing an aggregate such as cement and sand or water is stored in the material tank 1 through the charging port 5, and the charging port 5 is closed. Then, the valves 2, 21, and 24 are adjusted so that the inside of the material tank 1 and the mixing space 14 of the transport cylinder 11 have the same pressure. The material receiving port 11 and the discharge space 1 inside the transfer tube 10
When the pressure fluctuations 7 occur, these pressures are maintained by the balance pipe 16 so as to be equalized.

The material stored in the material tank 1 is introduced through the material receiving port 11 to the base end of the transport cylinder 10, and the material is supplied to the mixing space 14 of the transport cylinder 10 by a screw 12 rotated by a motor 8. The inside is carried toward the discharge space 17. During this time, cement, aggregate, water and the like contained in the material are further mixed. Discharge space 1 of transfer tube 10
The material conveyed to 7 is mixed with the pressurized air 22 and 23 sent from the pressure pipes 22a and 23a, and sent out to the discharge pipe 27 by the pressure. Then, the air is accelerated by the pressurized air introduced into the discharge pipe 27 from the pressurized air introduction port 26 provided in the discharge pipe 27, sent to the spray nozzle side (not shown) through the transfer hose 7, and discharged from there.
Thereby, for example, the spraying work of the spraying material is performed.

For example, in the spraying operation, the material transporting ability changes depending on the length of the transfer hose 7. Therefore, by adjusting the number of rotations of the motor 8 according to the transport capacity, the amount of material supplied to the discharge space 17 by the screw 12 can be appropriately adjusted. As a result, the necessary amount of the material is sent to the discharge space 17 side, and the material is sent out to the discharge pipe 27 by the transport airs 22 and 23 by that amount, and is pushed out to the transfer hose 7 by the compressed air introduced from the air inlet 26. it can. The flow rate of the pressurized air introduced from the air inlet 26 is adjusted by the valve 25.

In the spraying operation, the water content of the material,
Subtle fluctuations in the material transport capacity occur due to fluctuations in the particle size distribution, the movement of the spray nozzle, the runout of the transfer hose 7, and the like.
In the above-mentioned material supply device, since the surge space 19 is provided adjacent to the tip of the discharge space 17 of the transport cylinder 10, the supply of the material sent from the mixing space 14 side of the transport cylinder 10 suddenly becomes excessive. , The surplus material once enters the surge space 19. After that, when the supply of material returns to normal,
The material in the surge space 19 is returned to the discharge space 17 by the reciprocating blade 18 and sent from the discharge pipe 27 to the transfer hose 7 side. In this way, fluctuations in the transport amount of the material in the transport tube 10 can be buffered, and stable material supply can be performed.

This material supply device can be used to dry not only a wet material such as a material in which cement and aggregate are mixed with water, but also a single material such as a material in which only cement and aggregate are mixed or a thick base material. They can be mixed and transported. FIG. 3 shows an example of construction in which cement and aggregate are sent to the spray nozzle 36 by such dry mixing, mixed with water by the spray nozzle 36, and sprayed onto the slope 37.

First, the aggregate 32, which is sand, is placed in the measuring hopper 31.
And a fixed amount of aggregate is sent to the next weighing hopper 31 by the conveyor 30. In the latter weighing hopper 31, cement is injected from the cement input machine 33,
A predetermined amount of cement and aggregate together with the aggregate are charged into the material tank 1 of the spraying machine 29 by the conveyor. The material tank 1 shown in FIG. 3 is of a two-stage series type, and the material tanks 1 as shown in FIG. 1 are stacked in two stages in series. Cement and aggregate are supplied from the upper material tank 1 and compressed air supplied by the air compressor 34 causes the lower material tank 1 to transfer the above-described transport cylinder 10 (FIGS. 1 and 2).
(See Reference Material).

The material supply device 28 receives the supply of the pressurized air from the air compressor 34 and sends out cement and aggregate to the transfer hose 7 and sends it to the spray nozzle 36 by the above-described operation. Spray nozzle 3 from water pump 35
Water is pressure-fed to 6 and the cement and the aggregate are mixed with the water at the spray nozzle 36 and sprayed on the slope 37 to reinforce the slope.

In this spraying work, the cement and the aggregate are sent from the material supply device 28 to the spray nozzle 36 in a dry manner, where the cement and the aggregate are mixed with water and sprayed onto the slope 37. Was. On the other hand, in a state where the cement and the aggregate are mixed with water in advance, the spraying nozzle 3 is wet.
6, and spraying work can be performed.

[0029]

As described above, in the material supply apparatus according to the present invention, a desired amount of material can be quantitatively determined without being affected by the particle size of the material to be charged into the material tank, moisture, uniformity of mixing, and the like. And, it can be continuously mixed with the carrier air and sent out to the carrier hose 7, which makes it easy for the spraying machine to start up and eliminates clogging of the material of the carrier hose and pulsation of discharge of the material from the spray nozzle 36, In addition, long-distance transport can be performed.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional side view showing a material supply device according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a schematic diagram showing an example of a slope spraying work using the material supply device according to the present invention.

FIG. 4 is a side view showing a conventional example of a material supply device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 material tank 5 reduction gear 7 transfer hose 8 motor 10 transfer tube 12 screw 16 balance pipe 17 discharge space 19 surge space 22 pressurized air 23 pressurized air 22a pressurized air inlet pipe 23a pressurized air inlet pipe 26 reverse wing 27 discharge pipe 36 spraying nozzle

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D044 DC05 2E172 AA05 BA22 BA25 CA16 CA37 DC02 4F042 AA16 AA27 AB00 AB05 CA00 CB03 CB05 CB27 ED09 4G056 AA07 CB02 CC22 CD34

Claims (6)

[Claims] 1. A material is supplied from a material tank (1) containing the material, and compressed air (22), (2) is supplied to the material.
3) and the compressed air (22), (2)
In the material supply device for feeding the material to the transfer hose (7) by the pressure of 3), a transfer tube (10) having a cylindrical internal shape connected to one end of the material tank (1) and a transfer tube (10) are provided. Screw (12) housed rotatably
A rotating mechanism for rotating the screw (12) to feed the material introduced from the material tank (1) to one end of the transfer tube (10) to the other end of the transfer tube (10); Pressure air introduction pipes (22a) and (23a) for feeding compressed air (22) and (23) to the other end of the transport cylinder (10) to which the material is sent by the rotation of 12), and the transport hose (7). ), Said compressed air (22),
And a discharge pipe (27) for feeding the material sent from the transfer tube (10) to the transfer hose (7) by (23). 2. A balance pipe (16) for communicating several points in the longitudinal direction of the transfer tube (10) and equalizing the internal pressure in the longitudinal direction of the transfer tube (10). 2. The material supply device according to 1. 3. The pressure air introduction pipes (22a) and (23a) and the transfer hose (7) are connected to a discharge space (17) beyond a tip of a screw (12) of the transfer tube (10). The material supply device according to claim 1, wherein the material supply device is provided. 4. A discharge space (17) which is further ahead of a discharge space (17) in which the pressure air introduction pipes (22a) and (23a) of the transfer cylinder (10) and the transfer hose (7) are connected. 4) The material supply device according to claim 3, wherein a back feeding blade (26) for pushing back the material is provided on the side of). 5. A surge space (19) for temporarily storing a material, further ahead of a position of the transport cylinder (10) where the reverse wing (26) is provided. The material supply device according to item 1. 6. A spraying machine for spraying a material from a spray nozzle (36) provided at an end of a transfer hose, wherein the material is supplied from the material supply device according to any one of claims 1 to 5 to the transfer hose (7). And supply it to the spray nozzle (36)
A spraying machine characterized by discharging from