JP2000257393A - Rotary concrete spray device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the direction of the projection of concrete by providing an index displaying an opening part position on any one of a guide sleeve and the fixing part of the circumference of the guide sleeve, and providing a detecting means detecting the index on the other hand. SOLUTION: A proximity sensor for position detection S1 is embedded and set on the rear end cover 23 of a guide sleeve 20 in the rear end of a spray device 10 at a prescribed part, and a proximity sensor for rotary angle detection S2 is embedded and set. In rotating the sleeve 20, opening part position information, rotary angle information and the present position information of the sleeve 20 are transmitted from the proximity sensors S1, S2 and a present position detection sensor through a signal cable (c) to a programmable controller PC respectively. Furthermore, the controller PC processes information such as a rotary angle from the rotary direction, rotary speed and present position of the opening part of the sleeve 20 and displays them on a display part D. Thereby the direction of the projection of concrete can be easily confirmed even from the outside of the spray device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary concrete spraying apparatus.

[0002]

2. Description of the Related Art A rotary spraying device is a device in which a centrifugal force is applied to concrete by rotating an impeller in the manner of a centrifugal pump, and the centrifugal force projects the concrete toward a spraying surface. This device is airless in comparison with the conventional blowing device that uses compressed air as a carrier medium, so it eliminates problems such as dust generation and rebound dross, and also reduces the blowing surface. It has an excellent advantage that it can be finished smoothly. For this reason, it has recently been used for lining various tunnels from small-section tunnels to large-section tunnels and other wall protection works.

FIG. 3 shows a conventional rotary concrete spraying apparatus 60. In the figure, 61 is a concrete supply pipe provided with a concrete intake in the center,
The concrete is pumped toward the impeller device 63 arranged at the tip of the supply pipe 61 through the internal pressure feed path 62, and the concrete is further placed between the inside impeller 63a and the outside impeller 63b of the impeller device 63. The conveyed concrete is conveyed to the intervening guide sleeve 64, and the conveyed concrete is supplied to the impeller device 63 at a predetermined rotation speed from an opening formed in a predetermined opening shape by partially notching the peripheral surface of the guide sleeve 64 or the like. Then, due to the centrifugal force generated by the rotation of the impeller device 63,
It is configured to project concrete to the target construction position.

[0004]

However, the conventional rotary concrete spraying apparatus has the following problems.

[0005] That is, the rotary type concrete spraying device supplies concrete to a rotating impeller device, and the impeller device splashes the concrete toward the outside of the rotation circle of the impeller by centrifugal force and projects the concrete on the surface to be sprayed. Because it is a device that sprays concrete, the projection direction of the concrete to be sprayed depends on the properties of the concrete, and the mutual effects of the rotation speed and shape of the impeller device projecting blades that are in direct contact with the concrete, the mounting angle, etc. Changes.

That is, since the projection direction is likely to change, the operator frequently checks the operation status of the spraying device, and confirms and grasps the concrete projection direction and the amount of projection, so that the predetermined spraying direction and spraying can be performed. It is necessary to maintain the quantity.

[0007] However, as described above, the projection speed of the concrete that is splashed and projected from the impeller is quite high, and in addition, the visibility is poor due to the fine particles of the shotcrete floating in the work space. Often
It is difficult to visually confirm the projection status such as the concrete projection direction from the impeller.

In order to cope with such a situation, a means for confirming the projection direction of the concrete by grasping the position of the opening of the guide sleeve for supplying the concrete to the impeller device described above is employed. Since it is interposed between the inside impeller and the outside impeller, it is originally difficult for the operator during work to check the opening from outside the spraying device and to grasp the concrete projection direction. The projection direction was occasionally known by sparks generated when the aggregates in the attached concrete accidentally collided. Even with such a method, it is unknown where the opening is located in the spraying device that once stopped spraying work, and the position where concrete is first projected when restarting spraying work is also unknown. , It may adversely affect the accuracy and efficiency of work.

Accordingly, the present invention has been made in view of such a conventional problem, and a rotary concrete capable of easily confirming a concrete projection direction even from the outside of a spraying device during a spraying operation or while the operation is stopped. A spraying device is provided.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and is intended to transfer concrete fed through a concrete supply pipe to a rotatable guide sleeve provided at the tip of the supply pipe. In a rotary spraying machine that supplies the impeller device through an opening that opens a part of the direction to the projection range defined by the opening position by rotating the impeller device, the guide sleeve and An index indicating the position of the opening is provided on one of the fixed portions around the guide sleeve, and a detecting means for judging the position of the opening by detecting the index is provided on the other. I do.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of the rotary concrete spraying device of the present invention.

In the figure, a rotary concrete spraying device 10 includes a casing 11, a casing sleeve 12 disposed through the casing 11 and projecting to the rear, and a concrete supply sleeve 13 inserted into the casing sleeve 12. , An impeller device 14 protruding from the front surface of the casing 11, and a rotation drive mechanism portion 11 a in the casing 11, which is coaxially supported on the outer periphery of the casing sleeve 12 and rotationally drives the impeller device 14. ing.

The concrete supply sleeve 13 is coaxially arranged with a predetermined gap d inside the casing sleeve 12, and has a double pipe structure as a whole. The concrete supply sleeve 13 protrudes from the rear end of the casing sleeve 12 and is detachably connected to the elbow pipe 16. Concrete is supplied to the inside by a concrete pump or the like (not shown), and the concrete is supplied toward the impeller device 14. Discharge. Also, both sleeves 14,
A plurality of quick-setting agent pipes 17 are piped in parallel in the gap d of 16, the tip nozzle 17 a thereof is located at the end of the impeller device 14 on the side of the concrete supply sleeve, and the rear ends are rapidly connected via the elbows 18 respectively. It is connected to the agent hose 19.

By the above-mentioned mechanism, the liquid quick-setting agent is injected from the nozzle 22 immediately before the impeller device 14 by the supply pressure of a supply pump (not shown) connected to the quick-setting agent hose 19, and is fed through the concrete supply sleeve 13. Mixed in concrete.

The impeller device 14 mainly includes an impeller portion 15 divided into two parts, an inside impeller 15a and an outside impeller 15b, and a guide sleeve 20 which rotates relative to the impeller portion 15. The impeller 15 and the guide sleeve 20 are driven to rotate by two drive motors 21 and 22 disposed at the rear of the casing 11 via a rotation drive mechanism 11a. The inside impeller 15a and the outside impeller 15b have, for example, radially formed projection blades for concrete projection therein.
It is coaxially fixed via bolts and the like. The guide sleeve 20 is provided between the impellers 15a and 15b, and has an opening (not shown) at the outer periphery thereof, and a rear end connected to the drive mechanism. That is, the inside impeller 15a, the guide sleeve 20, and the outside impeller 15b are concentrically mounted in this order from near the center of the cross section of the spraying device 10.

The direction of rotation of the impeller 15 and the direction of rotation of the guide sleeve 20 are, for example, opposite to each other, and the concrete-setting agent mixture supplied into the inside impeller 15a is removed by the inside impeller 1.
At the opening position of the guide sleeve 20, the concrete-setting agent mixture is opened by receiving the centrifugal force of the inside impeller 15a while the guide sleeve 20 prevents the guide sleeve 20 from jumping outward due to the centrifugal force caused by the rotation of 5a. Then, it is projected outward by passing through the outer impeller 15b, and is further projected by receiving the centrifugal force due to the rotation of the outside impeller 15b.

FIG. 2 shows a state in which a proximity sensor S is attached as a detecting means T to the rotary concrete spraying device 10 having the above-described configuration so that the concrete projecting direction can be easily confirmed even from the outside of the spraying device 10. It is shown in FIG. FIG. 2 is a rear view of the rotary concrete spraying device 10 of the present invention.

In order to check the concrete projection direction, it is necessary to recognize the position at which the concrete to be projected is projected from the outside impeller 15b. For this purpose, the concrete impingement from the concrete supply sleeve 13 to the outside impeller 15b is required. It is necessary to detect the position of the opening of the guide sleeve 20 which mediates and supplies concrete. Therefore, for example, as shown in the figure, as the detecting means T, a position detecting proximity sensor S1 is embedded and installed at a predetermined position on the rear end cover 23 of the guide sleeve 20 at the rear end of the spraying device 10, A rotation angle detecting proximity sensor S2 for counting the rotation angle is embedded and installed in the rear end cover 23 of the guide sleeve 20.

Each of these proximity sensors S1 and S2 emits magnetic flux from the tip of the sensor. When a detection object to be detected approaches the sensor, a magnetic flux change is generated, and the magnetic flux change is converted into an electric signal. To obtain the detection data. Therefore, on the circumference of the end surface of the guide sleeve 20, for example, a metal piece or the like is attached at an appropriate interval for detecting a rotation angle, and is used as an index R (not shown). Measures are taken to obtain it. In addition, the same index R is appropriately provided in the opening of the guide sleeve 20 according to the detection situation.

Although not shown, the above proximity sensor S
Aside from 1, S2, an original position detecting sensor for detecting the original rotational position of the guide sleeve 20 is attached to the guide sleeve 20. When the guide sleeve 20 rotates, it is obtained from the rotation angle detecting proximity sensor S2. The information of the rotation angle, the opening position information detected by the position detection proximity sensor S1, and the original position information of the guide sleeve 20 obtained from the original position detection sensor are combined with the guide sleeve 20 at present. Can be recognized in which direction and how much the opening is located. In addition, not only during the rotation of the guide sleeve 20 but also when the operation is stopped and the rotation is stopped. Also detects the opening of the guide sleeve 20 and
It is possible to know the rotational position situation of zero.

The information obtained from the detection sensor as described above is first passed through a signal cable C as an electric signal to a programmable controller PC having various arithmetic analysis functions.
The arithmetic processing is performed by being transmitted to. Therefore, the programmable controller PC is provided with the guide sleeve 20.
Information such as the rotation direction, rotation speed, and rotation angle of the opening from the original position is integrated and processed and output to the display unit D.

As shown in the figure, the display unit D is a light-weight, box-shaped light-emitting body L such as a light-emitting diode, for example.
The light-emitting body L emits light according to the position of the opening based on the signal from The display unit D is lightweight and small, and can clearly display the position of the opening using the light emitting body L. Therefore, the display unit D can be installed at any place that is easy for the operator of the spraying device 10 to see, and has sufficient illumination. Therefore, the position of the opening can be easily and reliably recognized even in an environment where the visibility is poor due to the drift of dust and the like.

When the concrete spraying operation is performed using the rotary concrete spraying apparatus of the present invention as described above, the operation environment such as poor visibility due to dust and rebound from the sprayed object is hardly affected. At the beginning of the spraying operation
Even before the rotation starts, the position of the opening, that is, the concrete projection direction can be easily checked, and even during the work, of course, the concrete projection direction can be easily and reliably checked. The operator can operate the spraying device according to the condition and shape of the wall surface to be sprayed, adjust the concrete projection direction, spray amount, etc., and carry out the optimum spraying work it can.

When the rotary concrete spraying apparatus of the present invention is provided with an automatic control device, the position of the opening in the guide sleeve 20 is detected by the detecting means T,
By transmitting the detection result to an automatic control device or the like, it is possible to automatically control the spraying direction, spraying range, construction speed, and the like.

In this embodiment, the display unit D using the light emitting diode is shown. However, the present invention is not limited to this. Any display type can be selected according to the device and working environment. Various display forms, such as those displayed on the display of the above, can be selected. Further, the present invention is not limited to only display means for visually indicating the position of the opening, and it is also possible to employ any means for causing an operator to recognize the sound or vibration, for example.

[0026]

As described above in detail, in the rotary concrete spraying apparatus of the present invention, an index indicating the position of the opening is provided on one of the guide sleeve and the fixed portion around the guide sleeve. On the other hand, since it is provided with a detecting means for judging the position of the opening by detecting this index, the fine particles of the concrete which is splashed and projected from the rotating impeller, or the object to be sprayed. Even in a work environment where rebound from the surface floats in the work space and visibility is poor, the position of the opening is clearly displayed to the operator by displaying the opening position information obtained from the detection means on, for example, a display device. The operator can optionally check the operation status of the spraying device, and can easily and reliably confirm and grasp the concrete projection direction and the amount of projection. To become. Therefore, it is possible to easily secure a predetermined spraying direction, a spraying amount, and the like for the spraying target.

Further, even in the spraying device in which the spraying operation has been stopped, it is clear where the opening is located by checking the opening position information obtained from the detecting means. The position where concrete is first projected when restarting is also clear, which can improve work accuracy and work efficiency.

In addition, the detecting means used in the rotary concrete spraying apparatus of the present invention has a basically simple structure, such as a proximity sensor, for performing detection in a non-contact state with respect to a detection target. By adopting a material that is durable and inexpensive with almost no risk of abrasion, the cost of parts and mounting is low, so that it can be used in a wide range of work sites. It can contribute to improvement of work efficiency and cost.

Further, for example, if a small and lightweight display device is used to indicate the position of the opening, it can be easily installed at any place of the operator who is operating the spraying device, and the progress of the work and the work It can be moved freely according to the environment, which leads to maintaining good work efficiency.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary concrete spraying device of the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a sectional view showing an example of a conventional rotary concrete spraying device.

[Explanation of symbols]

 T detecting means R indicator S proximity sensor D display unit 14 impeller device 15a inside impeller 15b outside impeller 20 guide sleeve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatomo Nakajima 2-15-2 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Kozo Hayashi 422 Kuramochi Akeno-cho, Makabe-gun, Ibaraki Prefecture (72) Inventor Shigeo Yamaguchi 422 Kuramochi, Akano-cho, Makabe-gun, Ibaraki Prefecture Koyo Seiki F-term (reference) 2D044 DC05 2D055 DB04 2E172 DB13 DC02 DC08 HA03 3H034 AA05 AA20 BB01 BB06 CC03 DD02 DD28 EE09 EE15 3H079 AA30 BB10 CC03 CC17 CC21 DD48

Claims (1)

[Claims] 1. A concrete fed through a concrete supply pipe is supplied to an impeller device through an opening in a part of a rotatable guide sleeve provided at a tip end of the supply pipe in a circumferential direction, and In a rotary spraying machine configured to project by rotation of the impeller device toward a projection range defined by an opening position, the opening position is set to one of the guide sleeve and a fixed portion around the guide sleeve. A rotary concrete spraying apparatus characterized by providing an index to be indicated and, on the other hand, detecting means for judging the position of the opening by detecting the index.