JPS5933840B2 - explosive loading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is such that when a packaged explosive is inserted through the supply port of a loading cylinder of an explosive loading machine, the packaged explosive can be pumped into the blast hole through a loading hose using air. This relates to improvements in explosive loading and equipment.

Conventionally, this type of explosive loading device has been known, in which packaged explosives are ejected forcefully into the blast hole one by one, the packaging is broken, and the gelatinous explosive itself is released sequentially from the bottom of the hole. I try to load them so that they are stacked.

By the way, when loading such explosives, first bring the tip of the loading hose as close as possible to the bottom of the blasting hole, and ensure that the pressure-fed packaging and explosives collide with the bottom of the hole. It is preferable to rub it once to break it, but if you bring the tip of the loading hose too close to the bottom of the hole, the distance between it and the previously loaded explosive will disappear and the package of the explosive to be loaded this time will be ruptured. As a result, the explosives inside cannot be stacked one by one in sequence, and as a result, effective blasting cannot be carried out.

For this reason, when loading the explosives, the loading hose can be retracted in this order (artificially), but this operation is difficult and requires some time.
However, it is practically impossible to set the amount of retraction exactly in accordance with differences in the diameter of the blasting holes, differences in the amount of explosives packed, etc.

The present invention has been made by focusing on such a problem, that is, the retraction control of the loading hose. The basic objective is to provide an explosive loading device that can

For this reason, the present invention) provides an explosive loading machine that pumps packaged explosives into a blast hole through a loading hose;
A hydraulic motor that can freely rotate forward and backward to move the loading hose forward and backward with respect to the blasting hole through one rotation of the roller;
A drive circuit (1) is provided to cut the reversal and stop of the hydraulic motor; a smell control valve (1) detects when a predetermined number of explosives have been supplied. a first detection means for outputting a loading signal; a second detection means for detecting a retraction amount of the loading hose from the rotation angle of the roller and outputting a retraction signal when the loading hose has retreated by a predetermined amount; Using the loading signal from the detection means 1 as input, the control valve is switched to the reverse side of the hydraulic motor (to the backward side of the loading hose), while the reverse signal from the second detection means 1 is input to switch the control valve to the reverse side of the hydraulic motor. It is equipped with a retraction control means for the loading hose that switches the stopping side once, and for each explosive loaded in a predetermined armpit, it is retracted by a fixed pitch corresponding to the loading thickness (layer thickness) of one explosive, and the end of the loading hose and the loaded It is characterized by being strained so that the distance between the inside of the blast hole and the explosives can be maintained at a constant distance, and the contents of the packaged explosives to be loaded next time can be stacked up securely.

Hereinafter, the present invention will be explained more specifically based on the illustrated embodiment 1.
I will explain this.

In the work vehicle shown in FIG. 1, 1 is the main body of two caterpillars, 2 is a rock drill supported on a guide cell 3 so as to be able to move forward and backward, 4 is a drive morph for the forward and backward movement of the rock drill 2, and 5
A boom supports the guide cell 3 from the vehicle body 1 via the support member 6, and the boom 5 is operated by a boom lift cylinder 7 and a boom swing cylinder 81 to be lifted and swung, respectively. , the guide cell 3 is adapted to be lifted and swung by a cell lift cylinder 9 and a cell swing cylinder 10), and a rock drill 2 is positioned at a desired location on the bedrock 11 to drill a blast hole 12. It constitutes a rock drilling device.

On the other hand, 13 is an explosive loading machine whose basic configuration will be explained below, 14 is a hose for loading explosives, and 15 is this loading hose 1.
A loading hose drive device 16 is installed at the rear of the guide cell 3 in order to drive the loading hose 14 through the blasting hole 12f. When a packaged cylindrical explosive (see FIG. 2, 19) is inserted through the supply port 18 of the loading tube 17 of the explosive loading machine 13, the packaged explosive is transferred through the loading hose 14. This constitutes an explosive loading device that pumps the explosives with air and releases them into the blast hole 12.

FIG. 2) As shown, the operation control circuit of the explosives loading device basically consists of an explosives loading circuit 20 for pumping the packaged explosives 19 with air, and a drive for driving the loading hose drive device 15. The circuit 21 and the control circuit 22 that receives signal inputs from the explosive loading circuit 20 and the 1 drive circuit 21 to control the drive of the loading hose drive device 15 respectively.
It consists of this.

The explosive loading machine 13 that cooperates with the explosive loading circuit 20 is provided at two positions in the passage of the loading cylinder 17, one near the supply port 18 and one downstream from it, as shown in simplified form in FIG. Two on-off valves 23 and 24 that normally open and a loading cylinder 17
A striker 25 for detecting explosives is provided between the opening/closing valves 23 and 24 so as to normally protrude into the passage.
and upstream and downstream air supply passages 26 and 27, each communicating with the passage of the loading cylinder 17 and opening toward the back when the opening/closing valve is in the open position, and air supplied from the air source 28. The air pilot type switching valve 29 switches between the upstream and downstream air supply paths 26.27 to supply F.
It's straining.

The air pilot type switching valve 29 has a spring 29a.
Normally, the downstream air supply path 27) is biased to supply air, and when the striker 25 is pushed up by the insertion of the packaged explosive 19, as shown by ■ in the figure,
This pushing-up operation causes the first detection valve 31 as the first detection means provided in the pilot circuit 30 to close to the spring 3.
1a, the pilot pressure is applied to the switching valve 291 via the gate or gate 32, and the spring 29
The switching valve 29 is switched to the upstream air supply path 26 in opposition to a, and the packaged explosive 19 is fed from the upstream air supply path 26 from the back side of the on-off valve 23 to the downstream on-off valve 24 side.

When the explosive 19 has completely passed through the striker 25, the striker 25 protrudes into the passage again, and at the same time, in conjunction with this operation, the first detection valve 31 is moved back by the spring force of the spring 31a, and the pilot pressure is reduced. , the switching valve 29 moves back by the spring force of the spring 29a to supply air to the downstream air supply path 271, and this air 1 is used for blasting through the loading hose 14 connected to the outlet of the loading cylinder 17. Explosive charge 19 is pumped into hole 12.

In the explosive loading circuit 20, 33 is a pressure reducing valve that appropriately reduces the pressure of the air supplied by the air source 28, 34 is a flow rate adjustment valve, and 35 is the first detection valve 3 of the pilot circuit 30.
A manually operated valve for testing is connected to the OR gate 321 in parallel with 1, and 36 is a loading detection circuit provided by branching off downstream of the OR gate 32 of the pilot circuit 30. The pilot pressure obtained when the first detection valve 31 is opened by the striker 25) is input to the control circuit 221 as a loading signal P.

Further, 37 and 38 are connected to the loading/detection circuit 36), and are a counter with a reset and an integration counter that count each time the loading signal P is input. The number of explosives 19 to be loaded is counted, and the integration counter 38 counts the total number of explosives 19 loaded.

Next, the drive circuit 21 provided for the loading hose drive device 15 will be explained.

The loading hose 1 drive device 15 has a hydraulic pressure system capable of forward and reverse driving, as shown in FIG. 2 and FIGS. The motor 39) is thus driven and the friction 1 causes the loading hose 1
4 and an air cylinder 411.
As a result, the loading hose 14 was biased and held between the drive roller 40 and the drive roller 40.

A driven roller 42 having the same frictional properties as the driving roller 40
, an indexing plate 43 that rotates in accordance with the rotation of the driven roller 42 that follows the loading hose 14 that is coaxial with the driven roller 42 (which is supported and drives the driving roller 40 ), and is moved forward and backward by the loading hose 14 ; 1 for each given rotation angle of
The second opening is operated against the spring force of the spring 44a.
A second detection valve 44 is provided as a detection means.

As shown in FIGS. 3 to 5, the first drive roller 40 is actually mounted on the underside of the loading hose 14, while the driven roller 42 is connected to the loading hose 14 and the first driving roller 40. One end of the shaft 46 is rotatably supported between the bearing fittings 45 attached to the plunger end of the air cylinder 41, which is set to have a diameter larger than the diameter t, and is installed downward. The above-mentioned index plate 43 is attached so as to be replaceable.

This indexing plate 43 has a diameter almost equal to the diameter of the driven roller 42, and as shown in FIG. Each time the index plate 43 is rotated by one pitch angle, the actuator 44b of the second detection valve 44 is pushed in to open the second detection valve 44.

The pitch angle of the indexing plate 43 is set in correspondence with the one-to-one backward pitch of the loading hose 14, and
If it is necessary to change the retraction pitch due to a difference in the hole diameter between the two, the index plate F having a pitch angle corresponding to the retraction pitch to be changed may be replaced.

Returning again to FIG. 2, the drive circuit 21 includes a hydraulic circuit 48, which is supplied with hydraulic pressure by the hydraulic pump 70, and which drives the hydraulic motor 39, which drives the drive roller 40, in the forward and reverse directions. 2 detecting valve 44, and when the loading hose 14 is retracted by one pitch, the control circuit 221 sends air from the air source 28 to the retract signal Q.
A hose retraction detection circuit 49 is provided.

In the drive circuit 21, 50 is a pressure reducing valve that reduces the pressure of air from the air source 28 and then supplies it to the air cylinder 41 that urges the driven roller 42.

Next, we will explain the control circuit 221 for controlling the forward and backward movement of the loading hose 14 and especially the backward movement of the fixed pitch.
The control circuit 22 includes a control valve 51 that is a bidirectional air pilot valve that controls switching of the hydraulic circuit 48;
A near pilot circuit 52 for constant pitch backward control of the control valve 51 (hereinafter referred to as a constant pitch backward pilot circuit).

), the basic component is an on-off valve 53 that opens the pilot circuit 52 in response to the explosive loading signal P from the explosive loading circuit 20 and closes it in response to the retreat signal Q from the drive circuit 21.

Further, 54 is a control valve 51) which is manually operated when the loading hose 14 is greatly advanced or retreated, and a pilot circuit 55 for manual advancement and retraction.
56 is a manually operated valve to which pilot pressure is applied from the air source 28; 57 is a manually operated valve 54;
When the is held in a neutral position, the pilot circuit 52 for constant pitch retraction is opened, and when the manual operation valve 54 is operated to the forward or backward side, the pilot circuits 55, 56 for manual forward movement and reverse are opened. An on-off valve 5 which cuts the middle of the pilot circuit 52 for fixed pitch retraction by pilot pressure 1 applied from either one of the
Reference numeral 8 designates an OR gate which is activated by the control valve 51 # when pilot pressure from either one of the pilot circuit 52 for constant pitch retraction and the pilot circuit 56 for manual rearward movement is applied.

Furthermore, reference numeral 59 is an on-off valve consisting of a near pilot tangent valve for turning on/off the retraction signal Q from the second detection valve 44 to the on-off valve 53 provided in the pilot circuit 52 for fixed pitch retraction. The on-off valve 59 has a throttle 60a and a check valve 60.
This pilot circuit 60 (therefore, after a predetermined delay time determined by the aperture 60a after the input of the reverse signal Q, the reverse signal Q is cut off, and then the reverse signal Q is cut off). This is done so that when the loading signal P is applied from the loading detection circuit 36 to the on-off valve 53, the pilot circuit 52 for constant pitch retraction can be opened in response.

Next, the operation of the above-mentioned explosive loading operation will be explained.

Figure 1 f) As shown in Figure 1, rock formation 1 is shown here.
When the loading hose 14 is positioned coaxially with the blast hole 12 drilled in the blast hole 12 and the manual operation valve 54 shown in FIG. The hydraulic circuit 48 is connected to the forward drive direction i of the hydraulic motor 39 to cause the hydraulic motor 39 to rotate forward.

The loading hose 14 is fed into the blast hole 12 by one drive of the one drive roller 40 by the hydraulic motor 39.

Since the length of the blasting hole 12 is known, this feeding stops just before the tip of the loading hose 14 reaches the bottom of the blasting hole 12, and thereafter the loading operation of the explosive 19 begins.

Now, put the first packaged explosive 19 into the supply port 1 of the explosive loading machine 13.
8, the striker 25 is activated, the first detection valve 31 is opened, and the pilot pressure from the pilot circuit 30 switches the switching valve 29 to open the upstream air supply circuit 2.
6 and starts pumping the packaged explosive 19 by supplying pressurized air supplied by an air source 28.

When the packaged explosive 19 has completely passed through the striker 25, the switching valve 29 moves back again by the spring force of the spring 29a, this time supplying pressurized air from the downstream air supply path 27, and the packaged explosive 19 passes through the loading hose 14. It is fed under pressure and is forcefully discharged from the tip of the loading hose 14 to the bottom of the blasting hole 12,
The package is removed and only the explosive inside sticks to the bottom of the hole.

During the loading of the explosive 19, simultaneously with the opening operation of the first detection valve 31 which is interlocked with the striker 251, the pilot pressure of the pilot circuit 30 is sent to the control circuit as a loading signal P via the loading detection circuit 36. 22, the on-off valve 53 opens the constant pitch after-pass pilot switch 52, and the pilot pressure is inputted to the control valve 5 through the or gate 58.
1 t was applied to the control valve 5, which had been in the neutral position until then.
1 to the backward side, and the hydraulic circuit 481 causes the hydraulic motor 39 to rotate in the reverse direction (in the backward direction of the loading hose 14).

Due to this reversal of the hydraulic motor 39, the loading hose 14 is retracted, but the driven roller 4 interlocked with the loading hose 14
2 rotates by one pitch angle as described above, the second detection valve 44 is opened by the index protrusion 47 of the index plate 43 that rotates together with the driven roller 42, and the hose retraction detection circuit 49 is thereby opened. Then, the reverse signal Q is turned on and off by the opening/closing valve 59.
through the on-off valve 5 of the pilot circuit 52 for fixed pitch retraction.
31 is applied, the on-off valve 53 is closed from this point, the pilot pressure of the pilot circuit 52 for constant pitch retreat is cut, the control valve 51 is moved back to the neutral position i, and the hydraulic circuit 4 is
81, the drive of the hydraulic motor 39 is stopped to stop the retraction of the loading hose 14.

In this case, the amount of retraction of the loading hose 14 is a predetermined amount preset by the index plate 43, and the next loading of the explosive 19 is retracted by a predetermined pitch to the most suitable position.

After a short period of time after the loading hose 14 stops retracting, the retraction signal Q that is still being output is applied as pilot pressure to the on-off valve 59 via the throttle 60a of the pilot circuit 60, and the on-off valve 59 is closed. When activated, a backward signal Q is sent to the on-off valve 53 of the fixed pitch backward pilot circuit 52.
cut.

The opening/closing valve 53 is held in that position even after the retreat signal Q is cut.
When input is received, the opening operation is responsive and the next reverse control is started.

(as above), loading explosives 19, loading hose 14
The counter 3 with reset is repeated while retracting by a fixed pitch.
71 Thus, the number of loaded explosives 19 is counted, and when the scheduled loading is reached, the supply of explosives 19 is stopped and the loading of explosives 19 to one blast hole 121 is completed.

When the loading of the explosive 19 is completed, the manual operation valve 5
4 to the backward side, and insert the loading hose 14 from the blasting hole 12.
Pull it out and complete one explosive loading operation.

Note that the present invention is not limited to the first embodiment described above, and for example, the loading hose may be set to be retreated by a fixed pitch once every two packed explosives are loaded. 43 (It goes without saying that this can be implemented in various ways, such as using a known rotation angle detection means such as an encoder instead.

As is clear from the above description, according to the present invention, when a predetermined amount of explosives is loaded, the loading hose can be automatically moved back by a predetermined pitch. By retreating at a fixed pitch, the advantage is obtained that only the contents can be loaded tightly from the bottom of the blast hole without leaving any gaps.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a working vehicle equipped with an explosive loading device according to the present invention, FIG. 2 is a circuit diagram of a drive control circuit for the explosive loading device according to the present invention, and FIG. 3 is a loading hose,
4 is a vertical cross-sectional view of the drive device, FIG. 4 is a view taken in the direction of arrow A in FIG. 3, and FIG. 5 is a cross-sectional view taken in the direction of line BB in FIG. 3. 12... Blasting" FL13... Explosive loading machine, 14... Loading hose, 15... Loading hose drive device, 17... Loading Tube, 18...
...Supply, 19...Explosives, 31...
...First detection valve, P... Loading signal, 39...
... Hydraulic motor, 40 ... Drive roller, 42
...Followed roller, 43... Index plate,
44...Second detection valve, 48...Hydraulic circuit, 51...Control valve, 53...Opening/closing valve, Q...Reverse signal.

Claims (1)

[Claims] 1. An explosive loading machine capable of supplying packaged explosives and pumping the explosive into the blast hole via a loading hose with air, and a forward/reverse rotation mechanism that moves the loading hose forward and backward with respect to the blast hole through the rotation of rollers. A flexible hydraulic motor and a drive circuit for the hydraulic motor are installed to switch between reverse rotation and stop of the hydraulic motor! llfM] valve, a first detection means for detecting the supply of a predetermined amount of explosives by the above-mentioned explosive loading machine and outputting a loading signal; A second detection means outputs a backward signal when the vehicle is moved backward, and the control valve is switched to the reverse side of the hydraulic motor by receiving the loading signal from the first detection means, and the second detection means outputs a backward signal when the motor moves backward. An explosives loading device comprising a loading hose retraction control means for switching a control valve to a hydraulic motor stop side in response to a signal input.