JPH0118207B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention allows water and air to be sent into the pit when drilling underground with a polling rod, and to spray a chemical solution such as cement milk around the drilling hole when pulling out the polling rod. This invention relates to a rotary injection device that performs injection.

This type of device attached to the spindle supplies low-pressure water to the bit side during drilling, and pumps high-pressure cement milk during extraction, as disclosed in, for example, Japanese Utility Model Application Publication No. 128632/1983. Then, the passage is automatically switched and cement milk is injected around the device, but according to the valve structure of the prior art, the pipe for water and the pipe for cement milk, etc. It becomes necessary to install the pipes separately (double pipes), which increases the weight due to the long pipe structure, which is disadvantageous in transportation and handling, and also leads to increased manufacturing costs. .

In view of these conventional drawbacks, this invention is designed to spray a chemical solution such as cement milk over a wide range with a strong jetting force, and effectively mix and stir the chemical solution and earth and sand. It is an object of the present invention to enable switching between the use of low-pressure fluids such as water or air and the use of high-pressure chemical solutions such as cement milk while using one passage.

The present invention has taken the following solution in order to eliminate the drawbacks of the above-mentioned prior art.

That is, the rotary injection device according to the present invention has a main body 1
consists of a central main part 8, a connecting sleeve 9 for connecting to the spindle, and a mounting sleeve 10 for the bit,
Further, a fluid passage 2 is formed passing through these in a substantially longitudinal direction, and the connecting sleeve 9 in the passage 2 is formed.
A cavity 17 is formed adjacent to the cavity 17, and an axial flow type impeller 4 is provided in the cavity 17 so as to be rotatable around the longitudinal axis of the main body 1, and a worm 18 is installed in the impeller 4. A worm gear 19 is engaged with the worm 18, a spur gear 20 is engaged with the worm gear 19, another spur gear 21 is engaged with the spur gear 20, and the spur gear 21 is engaged with the rotor. 5, the rotor 5 is located in a recess 22 formed on the outer periphery of the main body 1, and the shaft 5a penetrates in a direction orthogonal to the longitudinal direction of the main body 1. Further, a hollow passage 6 is formed in the rotor 5, and the hollow passage 6 has an inlet 6a formed in the shaft portion 5a, and a spout 6b formed at an eccentric position on the exposed end surface. The inlet 6a communicates with the passage 2 via a branch passage 7, and the cavity 17 is connected to the pressure chamber 16 by a passage portion 23, and the pressure chamber 16 has a A hollow shaft-shaped holder 11 is provided, and the holder 11
A valve body 12 is provided so as to pass through the through hole 15 in the longitudinal direction thereof, and is slidably slidable in the longitudinal direction of the main body 1, and is positioned in the pressure chamber 16 with one end surface thereof as a pressure receiving surface. and is positioned so that the other end face is opposed to the valve seat 13 with a distance therebetween,
In addition, when using high pressure fluid, the valve body 12
by displacing the through hole 15 by the valve seat 13.
It is characterized in that it is provided with a spring 14 that closes the opening, and when low-pressure fluid is used, it is configured to flow through the through hole 15 and into the mounting sleeve 10.

With the above configuration, when applying low-pressure fluid such as water or air during boring, the passage 2 (empty space 1
7. Even if the fluid that has passed through the passage 23) and reached the pressure chamber 16 acts on one end surface of the main body 12, which is the pressure receiving surface, the spring 14 is not displaced, and the other end surface is the valve seat 1.
3 and flows into the mounting sleeve 10 through the through hole 15 formed in the valve body 12. However, when a chemical solution such as cement milk is injected at high pressure, the pressure receiving surface of the valve body 12 High pressure acts on one end surface of the valve body 12 to displace the spring 14 and bring the other end surface into contact with the valve seat 13, thereby closing the through hole 15.
Automatic switching to the flow path leading to the rotor inflow path 6a via the branch path 7 is performed. This switching can be done simply by changing the chemical solution used, without requiring any special double pipes.

In other words, by providing a valve body 12 with a through hole 15 and biased by a spring 14 in one passage 2, a low pressure fluid such as water or air and a high pressure fluid such as a chemical liquid such as cement milk can be transferred. , they can be switched and used while using one common passage 2.

The details of this invention will be explained below based on one embodiment shown in the drawings. The main body 1 includes a central main part 8, a connecting sleeve 9 for connecting to the spindle, and a mounting sleeve 1 for the bit.
0, etc., and a fluid passage 2 is formed to pass through these in a substantially longitudinal direction. The shutoff valve 3 is interposed in front of the mounting sleeve 10, and consists of a valve body 12 having a hollow shaft shape and supported by a holder 11, and a valve seat 13 located opposite the rear end of the valve body 12. When high pressure is applied to the front end of the valve body 12 (the left end in FIG. 1), the valve body 12 retreats against the elasticity of the spring 14, and the passage 15 inside the valve body 12 is blocked by contact with the valve seat 13. I'm starting to do that. 16 is a pressure chamber from which the front end of the valve body 12 emerges. A cavity 17 is formed in the fluid passage 2 of the main body 1 in the vicinity of the connecting sleeve 9, and an impeller 4 is installed in this cavity 17.
is axially mounted in the same axial direction as the longitudinal direction of the main body 1. This impeller 4 is of an axial flow type. This impeller 4
and the rotor 5 are the worm 1 coaxial with the impeller 4.
8. They are interlocked via a worm gear 19, a spur gear 20 coaxial with the worm gear 19, and a spur gear 21 meshing with the spur gear 20, and the spur gear 21 is fixed to the shaft portion 5a of the rotor 5. . The rotor 5 is located in a recess 22 formed on the outer periphery of the main body portion 8, and its shaft portion 5a passes through the main body portion 8 in a direction perpendicular to its longitudinal direction. The hollow channel 6 of the rotor 5 has an inlet 6a in the shaft portion 5a, and has an ejection port 6b at an eccentric position on the exposed end surface. This hollow channel 6
The inlet 6a communicates with the passage 2 passing through the main body 2 via a branch passage 7, and FIG. 2 shows a part of the branch passage 7. 23 is a part of the passage 2, which connects the cavity 17 and the pressure chamber 16, and the branch flow passage 7 branches from this.

In the above configuration, relatively low-pressure water is supplied to the fluid passage 2 during drilling, so that water is ejected through the passage 2 toward the bit 24 side. That is, vacant room 1
Since the water flowing into the pressure chamber 16 through the pressure chamber 16 through the pressure chamber 7 and the passage 23 is at a low pressure, the shutoff valve 3 is kept open, so that this water flows out through the through hole 15 of the valve body 12 to the bit 24 side. .

Next, when the entire boring rod is pulled out, when high-pressure cement milk is pumped, the pressure applied to the front end of the shutoff valve 3 increases and the valve body 12 retreats.
A passage is blocked between the valve seat 13 and the valve seat 13. Therefore, the cement milk in the passage 2 flows into the hollow passage 6 of the rotor 5 through the branch passage 7, and is injected outward in the radial direction of the rotor 5 from the jet hole 6b in the exposed end face of the rotor 5. Since the rotor 5 rotates in conjunction with the impeller 4, which is rotated by the flow of cement milk, the cement milk is injected while drawing a circular trajectory. Furthermore, since the entire device rotates together with the spindle, the direction of jetting the cement milk extends around the entire circumference of the main body 1.

According to the rotary injection device according to the present invention, although it is configured to be able to inject chemical liquids such as cement and milk over a wide range at high pressure, it can also be used when low-pressure fluids such as water or air are used during boring, and when chemical liquids such as cement milk are injected at high pressure. When injecting, the supply passage can be used in combination, and thereby the conventional double pipe for supplying high and low fluids can be reduced to one simple pipe configuration, This made it possible to reduce weight and cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the device of the present invention, FIG. 2 is a cross-sectional view of the main part along a direction perpendicular to FIG. 1, and FIG. 3 is a schematic perspective view for explaining the operation. 1... Main body, 2... Passage, 3... Shutoff valve, 4...
...Impeller, 5...Rotor, 6...Hollow channel, 7...
...branch flow path.

Claims (1)

[Claims] 1 The main body 1 is composed of a central main part 8, a spindle connection sleeve 9, and a bit mounting sleeve 10, and a fluid passage 2 passing through these in a substantially longitudinal direction is formed, and the passage 2 A cavity 17 is formed adjacent to the connection sleeve 9 in the cavity 17, and an axial flow type impeller 4 is provided in the cavity 17 so as to be rotatable around the longitudinal axis of the main body 1. 4 is connected to a worm 18, a worm gear 19 is meshed with the worm 18, and the worm gear 1
A spur gear 20 is meshed with the spur gear 9, and another spur gear 21 is meshed with the spur gear 20, and the spur gear 21 is connected to the shaft portion 5a of the rotor 5. The rotor 5 is located in a recess 22 formed on the outer periphery of the rotor 5, and the shaft portion 5a penetrates in a direction orthogonal to the longitudinal direction of the main body 1, and a hollow flow path 6 is formed in the rotor 5. The hollow flow path 6 is
An inlet 6a is formed in the shaft portion 5a, and a spout 6b is formed at an eccentric position on the exposed end surface thereof.
The inflow port 6a communicates with the passage 2 via a branch passage 7, and the cavity 17 is connected to the passage portion 2.
3 to the pressure chamber 16, the pressure chamber 1
6 is provided with a hollow shaft-shaped holder 11, and the holder 11 is provided with a valve body 12 which is provided so as to pass through a through hole 15 in the longitudinal direction of the main body 1, so as to be slidable in the longitudinal direction of the main body 1. , and is located in the pressure chamber 16 with one end surface as a pressure receiving surface, and is located with the other end surface facing the valve seat 13 with a distance therebetween, and when high pressure fluid is used, the valve A spring 14 is provided for displacing the body 12 to close the through hole 15 by the valve seat 13, and is configured to allow low pressure fluid to flow through the through hole 15 and into the mounting sleeve 10 when low pressure fluid is used. A rotary injection device characterized by: