JPH06174399A - Charging device of explosive - Google Patents

Abstract

PURPOSE:To execute a charging operation safely and correctly by providing a prescribed-quantity supply mechanism in a storage tank, by applying a pressure required for charging an explosive in the storage tank into a blast hole by a charging tube or a pressure slightly higher than this pressure, by driving a supply impeller blade in a non-load state substantially and by charging the explosive thereby in a prescribed quantity. CONSTITUTION:A creamlike explosive is put inside a storage tank 1 and the inside of the storage tank 1 is sealed up. Compressed air regulated to have a pressure slightly higher than a pressure required for discharging the explosive from a charging tube is supplied into the storage tank 1 from a compressed air supply pipe by a pressure controller, so that the inside of the tank be put in a pressurized state. When a rotating shaft 29 is made to rotate by driving a drive motor 9, the explosive is pressed into a prescribed-quantity supply mechanism part 12 from an explosive supply part 30 by the operation of supply impeller blades 28A and 28B and sent under pressure to a delivery tube 13. On the occasion, the drive motor 9 is driven so that the explosive in a prescribed quantity to be charged in one blast hole may be supplied, and after the prescribed quantity of explosive is transferred by the supply impeller blades 28A and 28B, the drive motor 9 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosive loading device for loading explosives into a blast hole formed in a rock or the like,
In particular, the present invention relates to an explosive loading device capable of safely and accurately measuring a fixed amount of explosive and loading it into a blast hole.

[0002]

2. Description of the Related Art Conventionally, as a device for mechanically loading explosives into a blast hole in a rock mass, a granular explosive, for example, an ammonium nitrate oil explosive or the like is metered by rotation of a rotor and loaded by compressed air (special (Kaisho 63-96500) and a device for feeding and loading a cream-like explosive, for example, a water-containing explosive by a piston (Japanese Patent Publication No. 44-31958).
Are known.

[0003]

However, the above-mentioned piston type loading device has a problem due to friction due to friction in the piston and continuous supply. Further, the water-containing explosive is in the form of a cream or a slurry, which is a relatively safe explosive as compared with the dynamite-based explosive, but it is generally 10 to several tens kg /
When pressurized above a certain pressure of about cm ² , the performance as an explosive deteriorates because the micro voids in the components are destroyed.
There is also a risk of self-destruction if pressurized at a higher pressure. Furthermore, the water-containing explosive is highly viscous so that it will not flow out of the blast hole under its own weight between the time it is loaded into the blast hole and the time it detonates. Although it is possible to carry out pressure feeding by a high-pressure metering pump, the dangerous pressure is easily exceeded, and it has not been put to practical use from the viewpoint of safety. The object of the present invention is to solve the above-mentioned problems of the prior art described above, and to safely and accurately load an amount under all conditions regardless of the size of the blast hole, the type of water hole, etc. To provide an explosive loading device that can be operated by a worker.

[0004]

SUMMARY OF THE INVENTION The present invention is an explosive loading device for loading a cream-like explosive contained in a storage tank with compressed air into a blast hole through a loading pipe, and a compressed air supply pipe at the upper portion. A reservoir having, a delivery pipe having an explosive supply unit and a fixed amount supply mechanism unit connected to the bottom of the reservoir, and a drive motor provided at an end of the delivery pipe on the explosive supply unit side,
The present invention relates to an explosive loading device, characterized in that the explosive loading device is connected to the drive motor and has a rotating shaft provided with a spiral feed vane penetrating a feed pipe.

The above-mentioned cream-like explosive is a soft, sticky, and fluid explosive, and also includes a slurry-like explosive. As such a creamy explosive,
For example, water-containing explosives represented by emulsion explosives and slurry explosives can be mentioned.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of the explosive loading device of the present invention, and FIG. 2 is a partial cross-sectional view showing the main part thereof. First, in FIG. 1, a compressed air supply pipe 3 provided with pressure controllers 2A and 2B is provided in an upper part of a storage tank 1, and a lower part thereof is connected to an inflow pipe 5 through an inflow hole 4. A lid 7 is capped on the upper opening of the storage tank 1 via a packing 6 and fastened by a nut 8. A drive motor 9 is provided at one end of the feed pipe 5, and the drive motor 9 is connected to two drive pipes 11A and 11B extending from the control box 10 to perform controlled rotation drive. In addition, in the other end of the feeding pipe 5, a fixed amount supply mechanism unit 12 is provided.
Is provided, and a fixed amount of explosive is discharged by the controlled rotational drive of the drive motor 9. A delivery pipe 13 and a loading pipe 14 are connected to the tip of the constant amount supply mechanism 12 via an opening / closing valve 15. Further, the delivery pipe 13 is provided with a safety device 18 having a safety valve 16 and a rupture plate 17, the opening / closing valve 15 via an opening / closing operation circuit 19, and the safety valve 16 is a pressurizing circuit 20.
Each of them is connected to the control box 10 via. still,
Limit valve 21 provided on the rear surface of the drive motor 9
Are connected via a signal circuit 22 to a calculation mechanism (not shown) in the control box 10. The control of each mechanism can be performed by the operation button 25 of the operation box 24 extending from the operation tube 23.

Next, the main part of the explosive loading device of the present invention will be described with reference to FIG. In this example, a screw-type fixed amount supply mechanism unit 12 is adopted. The fixed amount supply mechanism unit 12 includes an outer cylinder 26 and an inner cylinder 27 fixedly provided on the inner circumference of the outer cylinder 26.
And a rotary shaft 29 having a spiral feed blade 28A rotatably provided in close contact with the inner surface of the inner cylinder 27 and fixed to the outer circumference. Then, a spiral supply blade 28B having an outer diameter larger than that of the supply blade 28A is fixed to the outer periphery of the rotary shaft 29 of the explosive supply unit 30. A slight gap is provided between the outer periphery of the supply vane 28B of the explosive supply unit 30 and the inner diameter of the delivery pipe 5. Also,
The drive shaft 9 side of the rotary shaft 29 is supported by a pair of sealed bearings 31, and the rear end of the rotary shaft 29 is connected to the drive motor 9 side.
Is integrally connected to the drive shaft 32 by a key.

The inner cylinder 27 is made of a special composite material such as Teflon containing fiber, which has a small frictional resistance with the outer circumference of the supply vane 28A.
The outer peripheral portion of the supply blade 28A, which is in close contact with the inner peripheral surface of the inner cylinder 27, is rotatably supported. Moreover, as the drive motor 9, a hydraulic motor, a pneumatic motor, or the like can be used.
Further, as the measuring mechanism, various metering pumps such as a mono type and a vane type can be used. However, the discharge is discontinuous like the plunger pump and gear pump,
It is not possible to use a device in which the maximum discharge pressure in one cycle is higher than the discharge average pressure.

Further, the rear surface of the drive motor 9 is shown in FIG.
The limit valve 21 is attached as shown in FIG. 2, the limit valve 21 faces the cam piece 33 fixed to the rear end of the rotary shaft 29 of the drive motor 9, and is connected to the signal circuit 22 of the limit valve 21 (see FIG. 2). ). 2 and 3
The other reference numerals have the same configurations as the same reference numerals in FIG.

The explosive loading device of the present invention having the above-mentioned structure has the following actions. First, a creamy explosive is put in the storage tank 1, the lid member 7 is capped, and the nut 8
And the inside of the storage tank 1 is sealed. Then, by the pressure controller 2A, compressed air adjusted to a pressure slightly higher than the pressure required to discharge the explosive from the loading pipe 14 is supplied from the compressed air supply pipe 3 to the inside of the storage tank 1 to be in a pressurized state. To do.

Next, when the operation button 25 of the operation box 24 is operated to drive the drive motor 9 by the sequence circuit of the control box 10 to rotate the rotary shaft 29, the explosive acts from the explosive supply section 30 to the supply vanes 28A and 28B. Then, it is press-fitted into the fixed amount supply mechanism section 12 and sent to the delivery pipe 13. At this time, the drive motor 9 is driven so that a predetermined amount of explosive charged in one blast hole is pumped, and the supply vane 28 is fed.
After A and 28B have moved a certain amount of explosive, the drive motor 9 is stopped. Therefore, if the tip of the loading pipe 14 is inserted into the blast hole of rock, a fixed amount of explosive measured by the constant amount supply mechanism unit 12 is loaded, and the loading amount does not become insufficient or excessive.

When the opening / closing valve 15 is opened / closed in response to the driving / stopping of the drive motor 9, the pressure feeding and the stopping of the explosive are further clarified, and the accuracy of weighing is improved. Further, since the on-off valve 15 is closed while the drive motor 9 is stopped, the explosive in the apparatus can always maintain a constant pressurized state, and the start of the drive motor 9 can be pressure-fed at the same time without delay.

As a structure for showing the above operation, the on-off valve 15 has a structure which is closed when a high air pressure is supplied into the valve. While the drive motor 9 is being driven, the pressure controller 2B causes the pressure controller 2A to
Compressed air having a pressure slightly lower than that is supplied to the opening / closing operation circuit 19 to open the opening / closing valve 15, and when the drive motor 9 is stopped, the pressure controller 2B compresses the pressure slightly higher than the pressure controller 2A. Air is supplied to the opening / closing operation circuit 19 to close the opening / closing valve 15. Such control is performed by the sequence circuit in the control box 10.

Further, the on-off valve 15 and the safety valve 16 described above can prevent the internal pressure of the apparatus from rising when an abnormal pressure is generated. That is, as described above, the open / close valve 15 is closed by being supplied with high air pressure when the drive motor 9 is stopped, but is supplied with a pressure slightly higher than the normal pressure supplied from the pressure controller 2A. Therefore, even if an abnormality occurs, it opens in response to a pressure rise sensitively and suppresses the rise of the pressure inside the device. On the other hand, the safety valve 16 is constantly closed by the pressure controller 2B during operation of the apparatus by supplying compressed air having a pressure slightly higher than the normal pressure supplied by the pressure controller 2A to the pressurizing circuit 20. . The safety valve 16, like the on-off valve 15, opens in response to an increase in pressure even when an abnormality occurs, so that the internal pressure of the device is prevented from increasing. Further, in the safety device 18, when the control pressure of the pressure controller 2A is exceeded, the disc-shaped rupture plate 17 is ruptured and opened, and the rise of the pressure inside the device can be prevented.

In the operation described above, if the number of times of loading of explosives is set in advance in the counter provided inside the control box 10, after the explosives are loaded a predetermined number of times by the sequence circuit, the drive motor 9 is automatically driven. It is also possible to perform control such that the explosive is stopped, and a fixed amount of explosive can be automatically loaded. Further, if the number of times of loading for a plurality of blast holes is set in advance, it is possible to automatically load the explosive suitable for each blast hole in sequence.

[0016]

As described above, according to the present invention, the fixed amount supply mechanism is provided in the lower portion of the storage tank, and the explosive in the storage tank is charged to the blast hole by the loading pipe, or slightly lower than this pressure. It is possible to pressurize to a high pressure, to drive the supply vane with almost no load, and to charge explosives in a fixed amount. Therefore, the length and inner diameter of the feed pipe and the flow velocity of the explosive in the feed pipe can be appropriately selected, and pressure can be fed and discharged at a pressure that does not reduce the performance of the explosive or self-destruction. In addition, the loading operation can be performed accurately. Further, since the explosive loading device of the present invention has a simple structure, it can be automatically controlled by appropriately interlocking with each other, and an operator can quickly obtain an appropriate amount of explosive for each blast hole. And it can be loaded accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an explosive loading device of the present invention.

FIG. 2 is a partial cross-sectional view showing a main part of FIG.

3 is a side view showing a drive motor portion of FIG. 1. FIG.

[Explanation of symbols]

 1 Reservoir 3 Compressed Air Supply Pipe 5 Inlet Pipe 9 Drive Motor 12 Constant Supply Mechanism 28A, 28B Supply Blade 29 Rotating Shaft 30 Explosive Supply 1 Storage Tank 2A, 2B Pressure Controller 3 Compressed Air Supply Pipe 4 Inlet 5 Inlet pipe 6 Packing 7 Lid material 8 Nut 9 Drive motor 10 Control box 11A, 11B Drive pipe 12 Fixed amount supply mechanism section 13 Delivery pipe 14 Loading pipe 15 Open / close valve 16 Safety valve 17 Bursting disc 18 Cutout 19 Open / close operation circuit 20 Pressurization Circuit 21 Limit valve 22 Signal circuit 23 Operation tube 24 Operation box 25 Operation button 26 Outer cylinder 27 Inner cylinder 28A, 28B Supply vane 29 Rotating shaft 30 Explosive supply section 31 Sealed bearing 32 Drive shaft 33 Cam piece

Claims (1)

[Claims] 1. An explosive loading device for loading a cream-like explosive stored in a storage tank with compressed air into a blast hole via a loading tube, the storage tank having a compressed air supply pipe in an upper portion thereof, and the storage device. A feed pipe having an explosive supply unit and a constant amount supply mechanism unit connected to the bottom of the tank, a drive motor provided at the end of the feed pipe on the explosive supply unit side, and a feed pipe connected to the drive motor And an axis of rotation having a spiral feed vane penetrating therethrough.