JPS61102991A - Rock driller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a rock drill.

(Prior Art) Conventionally, a shank 1 has been used as a rock drill, and has a main body driving means for advancing, retracting and stopping the main body, and a threaded portion provided slidably and rotatably inside the main body and screwed into a joint sleeve at the tip. a striking piston installed inside the main body that strikes and slides the rear end surface of the shank rod, and shank rod rotation means that rotates the shank rod while allowing it to slide. 0 holes drilled through the sleeve
．． It is known that holes are connected to each other to form a predetermined length for drilling work.

In the above-mentioned rock drilling machine, when recovering the drilling rod after drilling work, the operator first manually strikes the rear end of the shank rod with a striking piston to connect the threaded part of the shank rod to the joint. Loosen the screw with the sleeve,
Pull up the drilling rod to be recovered (hereinafter referred to as the recovery rod), and clamp the joint sleeve 103 screwed onto the lower end of the recovery rod 102 using the hydraulic chuck 101 (
(See Figure J fal).

After that, the shank rod 104 protruding from the main body 105
Joint sleeve 1 connecting the collection rod 102 and the collection rod 102
Open the sleeve clamp 107 provided at a position corresponding to 06 and the rod clamp 108 provided at a position corresponding to the lower part of the collection rod 102, and
Deflate 08.

Then, both clamps 107 and 108 are turned toward the collection rod 102, and both clamps 107 and 108 are extended (see FIG. 5).

Next, the rod clamp 108 is operated to clamp the recovery rod 102. As shown in FIG.
4. Tighten the screw part 4 to the joint sleeve 106 (see Fig. J fdl).

After that, the rod clamp 108 is unclamped to the holding state (refer to Figure J, te+), and the shank rod 10
4, move the main body 105 backward, and connect the lower end threaded part 102a of the recovery port 1 door 102 with the joint sleeve 10.
3 (see Figure j if)).

Then, actuate the sleeve clamp 107 and the rod clamp 108 to clamp the joint sleeve 106 and the vicinity of the lower end of the collection rod 102 (see FIG. 5(q)), and while the shank rod 104 is reversed, the main body 104
, and threaded part 104a of shank rod 104.
and unscrew the joint sleeve 106 (see Figure J fhl).

Then, both clamps 107 and 108 are rotated to store the collection rod 102 in the magazine. Then, the next collection rod is sequentially stored in the same manner.

However, in the above-mentioned rod recovery work, retightening work is performed by moving the main body forward for a certain set time and rotating the shank rod in the normal direction. Since the shank rod is slidable and the position of the shank rod differs depending on the drilling direction, and since loosening the screw is done manually, the loosening state of the screw differs depending on the operator, so it is possible to retighten the screw reliably in all cases. The setting time is set long enough. Therefore, during retightening work, if the shank rod is rotated in the normal direction while the main body is automatically advanced for a set time, the main body may advance more than the required amount, and in that case, the amount of advance beyond the required amount will be recovered. A large compressive force acts on the rod, causing the retrieval rod to curve into a bow shape, and when the threaded portion of the lower end of the retrieval rod and the joint sleeve are unscrewed, the rotation of the shank rod is efficiently extended to the threaded portion of the lower end of the retrieval rod. It doesn't communicate well, and the screwing mentioned above can't be released properly.

Therefore, conventionally, when the recovery rod is curved into an arch shape as described above, the operator has to manually move the main body back to remove the curve of the recovery rod, which is extremely inefficient.

(Objective of the Invention) An object of the present invention is to provide a rock drill that can automatically perform retightening work without bending the rod into a bow shape.

(Structure of the Invention) The present invention includes a non-position detecting means for detecting the position of the shank rod, and a main body that detects the position of the shank rod according to a position signal from the position detecting means when the threaded portion of the shank rod is screwed into the joint sleeve. The invention is characterized in that it has a control means for controlling the drive means.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes the main body of the rock drill, which is moved forward, backward, and stopped by a cylinder 21 (see FIG. 2) serving as a main body driving means.

Inside the main body 1, there is a joint sleeve 10 at the tip.
6 (see FIG. 5) is rotatably and slidably provided. This shank rod 2 slides when its rear end surface 2a is struck by a striking piston 3 provided inside the main body 1, and the teeth 5a of a sleeve 5 connected to the rear of the shank rod 2 via a bushing 4. It meshes with a gear 6 rotated by a motor 22 (see FIG. 2) serving as shank rod rotation means, thereby allowing the shank rod 2 to rotate while allowing it to slide.

The shank rod 2 is also supported by a front head 8 via a front bushing 7. The shank rod 2 is still provided with a central air hole 2b for milling, and a blow tube 9 extending from the rear end of the main body 1 through the striking piston 6 is fitted into the central air hole 2b. ing.

Further, the shank rod 2 is radially bored with a detection hole 2C (position detection means) communicating with the central air hole 2b.
The detection hole 2C is connected to a control means as shown in FIG. 2 via an air passage 10 passing through the sleeve 4 and the like.

That is, in FIG. 2, 21 is a cylinder (main body driving means) that moves the main body 1 forward, backward, and stopped, and 22 is a motor (shank rod rotating means) that rotates the shank rod 2 while allowing it to slide.

The above cylinder 21 is! Port 2 position electromagnetic shut-off valve 2
6, the motor 22 is connected to a seventh electromagnetic switching valve 24 of a 3-position type port, and the motor 22 is connected to a second electromagnetic switching valve 25 of a 3-position type port, and is supplied with hydraulic oil from a hydraulic source 26. It looks like this. The first electromagnetic switching valve 24 is
The second electromagnetic switching valve 25 has a forward rotation position 24a, a stop position 24b, and a retreat position 24c, while the second electromagnetic switching valve 25 has a forward rotation position 24a, a stop position 24b, and a retreat position 24c.
It has one stop position 25b and a retreat position 25C, and both switching valves 24,25 are controlled simultaneously.

On the other hand, the electromagnetic on-off valve 23 has a communication position 25a and a cutoff position 2.
3b, and when the detection hole 2C detects air from the blow tube 9, it is excited using this as a signal and moves to the communication position 23a, causing the cylinder 21 to extend and move the main body 1 forward. .

With the above configuration, when retightening is performed during rod recovery work, both the switching valves 24 and 25 are switched to the forward position 24a and the rotational position 25a for a set time, but the distance between the shank rod 2 and the striking piston 3 When L1 is below the set value, the detection hole 2C is closed by the blow tube 9 and no air is taken out, so the on-off valve 23 is not energized and is at the cutoff position 23b, so the main body 1 does not move forward. The shank rod 2 moves forward relative to the main body 1 while rotating.

On the other hand, the distance L1 between the shank rod 2 and the striking piston 6
If exceeds the set value, the detection hole 2C is opened and the air flowing through the blow tube 9 and the share passage 10 is taken out.
It becomes a. Accordingly, the main body 1 moves forward while the shank rod 2 rotates.

Note that when the above-mentioned interval L1 becomes less than the set value due to the movement of the main body 1, the on-off valve 23 is demagnetized and the shutoff position 23b
becomes.

In this way, the main body 1 is advanced in small steps by the minimum necessary amount, so that the movement of the shank rod 2 and the recovery rod 102
No unnecessary compressive force is applied to the retrieval rod 102, and the retrieval rod 102 does not curve into an arched shape due to additional tightening. Therefore, the rod recovery work can be performed with good work efficiency.

In addition, in the case of upward drilling work, when the screw is loosened, the rod and the shank rod 2 fall under their own weight, so the distance L1 between the shank rod 2 and the striking piston 3 is less than the set value, so the main body 1 does not move forward and shank rod 2
However, when the forward rotation causes the shank rod 2 to move forward relative to the main body 1 and the distance L1 exceeds the set value, the shank rod 2 rotates as in the case described above. The main body 1 will move forward appropriately,
Retightening work will be carried out.

In the above embodiment, the position detection means for detecting the position of the shank rod detects the position of the shank rod by detecting air flowing through the central air hole provided in the shank rod for milling through the detection hole. Although it is designed to detect the position of the shank rod, any other device (such as a limit switch) that can detect the position of the shank rod can be applied.

(Effects of the Invention) According to the present invention, during retightening work, the drive of the main body is controlled according to the position of the shank rod, so even if the main body is tilted, the work can be performed without bending the recovery rod. This can be done automatically and accurately, improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of the main part of a rock drill, FIG. 2 is a circuit diagram showing an example of the control means, FIGS. 3 and 7 are action explanatory diagrams, and FIG. J figure fat ~ Makoto)
It is an explanatory view of recovery work of a drilling rod. 1... Body, 2... Shank rod,
2c...detection hole, 3...impact piston, 9...blow tube, 21...cylinder, 22-old...motor, 23... ...Electromagnetic on-off valve Fig. 5, page 1, i gate 2'-': S (double 2, no double plate, Fig. 127-t', page 2, clean SC, no change) Procedure amendment (Method) % Formula % 1988 Patent Application No. 2237gj 2 Name of the invention Rock drill 3 Relationship with the case of the person making the amendment Patent applicant address 3-1 Shochi, Fuchu-cho, Aki-gun, Hiroshima Name ( 313
) Mazda Motor Corporation Representative Ken Yamamoto - 4 Agent Postal code 650 Address Asahi Seimei Sannomiya Building 1-3-11 Sannomiya-cho, Chuo-ku, Kobe, Hyogo Prefecture Showa Otsu 0 February 2015 (Delivery date ≦ o, 2 ..2 Otsu)6
Target of correction (1) Drawing 7 Contents of correction Figures 5 (b) to (b) of the drawing will be corrected as shown in the attached sheet. 8 List of attached documents

Claims (1)

[Claims] (1) A main body driving means for advancing, retracting and stopping the main body, a shank rod that is slidably and rotatably provided inside the main body and has a threaded portion at its tip that is screwed into the joint sleeve, and a shank rod that is provided inside the main body and has a threaded portion that is screwed into the joint sleeve. A rock drill equipped with a striking piston that strikes and slides the rear end surface of the rod, and a shank rod rotation means that rotates the shank rod while allowing the shank rod to slide. When screwing the threaded part of the rod into the joint sleeve,
A rock drill comprising: a control means for controlling the main body drive means in accordance with a position signal from the position detection means.