An underground metal mine exploitation blasting charging device and method thereof

Abstract

The present application relates to the technical fields of mining blasting, in particular to a kind of underground metal mine exploitation blasting charging device and method thereof.The underground metal mine exploitation blasting charging device includes two symmetrical arc-shaped plates, the top of the two arc-shaped plates is connected with a fixed seat on the side away from each other, a first telescopic rod is connected between the fixed seat and the arc-shaped plate, a first spring is sleeved outside the first telescopic rod, and a support is connected between the top of the two fixed seats.The present application can achieve the effect of pushing the arc-shaped plate to expand and extrude the inner wall of blast hole by setting upper support mechanism, lower support mechanism, arc-shaped plate and fixed seat.On the one hand, the arc-shaped plate compacts the soil and gravel of the inner wall of blast hole, expanding the charging space in blast hole;On the other hand, the arc-shaped plate isolates the rough inner wall of blast hole, so that the medicine bag contacts the smooth inner wall of arc-shaped plate and falls smoothly, which can effectively avoid the situation of blockage caused by the medicine bag skewing during charging process, making the blast hole charging more quickly and conveniently.

Description

Technical Field

[0001] This invention relates to the field of blasting technology, specifically to a blasting charging device and method for underground metal mining. Background Technology

[0002] Deep-hole blasting in metal mines typically involves drilling on a pre-prepared bench. Drilling is generally divided into two types: vertical drilling and inclined drilling. The drilling rig drills at pre-planned fixed points, and the resulting holes are usually called blast holes. Then, explosive charges are placed in the standard blast holes. In vertical blast holes, the loading process usually involves placing an explosive charge with a detonation circuit at the bottom of the blast hole, and then stacking other explosive charges without circuits in sequence. The explosive charges fall into the blast hole by their own gravity.

[0003] Because the inner wall of the borehole is rough, the explosive charge is prone to tilting during its descent, causing blockage. Currently, a common method to clear the blockage is to insert a ram into the borehole to push the explosive charge down. However, the ram must be removed quickly after each clearing, otherwise it will block the insertion of subsequent explosive charges. This results in problems such as easy blockage of the explosive charge, time-consuming clearing, and low work efficiency. In addition, since the explosive charge with the detonation circuit is located at the bottom of the borehole, and the detonation circuit is placed along the inner wall of the borehole, other explosive charges are prone to squeezing the detonation circuit during their descent, which can easily damage the circuit during clearing and affect the smooth detonation of the borehole. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention provides a blasting charging device and method for underground metal mining.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A blasting charging device for underground metal mining includes two symmetrically arranged arc-shaped plates with their concave arc surfaces facing each other. A fixed seat is connected to the top of each arc-shaped plate on the side furthest from each other. A first telescopic rod is connected between the fixed seat and the corresponding arc-shaped plate, and a first spring is sleeved on the first telescopic rod. A bracket is connected between the tops of the two fixed seats. Grooves are provided at the upper and lower ends of each arc-shaped plate near their front and rear edges. Upper support mechanisms are installed in the two grooves on the front and rear sides of the upper ends of the two arc-shaped plates, respectively. Lower support mechanisms are installed in the two grooves on the front and rear sides of the lower ends of the two arc-shaped plates, respectively. Clamping mechanisms are connected to the top of the front and rear side walls of the left and right arc-shaped plates. A detonation circuit protection mechanism is installed on the inner wall of one of the arc-shaped plates.

[0007] Both the upper and lower support mechanisms include a first support rod, a second support rod, a first pin, and a second pin. The first pin passes through one end of the first support rod and one end of the second support rod, and the two ends are rotatably connected by the first pin. A first torque spring is sleeved on the outside of the first and second support rods, with one end connected to the end of the first pin and the other end connected to one end of either the first or second support rod. The other ends of the first and second support rods are far apart from each other, with the other end of the first support rod rotatably positioned in a groove on the right side via the second pin, and the other end of the second support rod rotatably positioned in a groove on the left side via the second pin. A second torque spring is sleeved on the outside of each second pin, with one end connected to the inner wall of the corresponding groove and the other end connected to the other end of the corresponding first or second support rod. The first pins on the upper and lower support mechanisms are far apart from each other in the vertical direction.

[0008] As a preferred embodiment of the present invention, the bottom of the fixed seats on both the left and right sides are fixedly connected with ground cones, one end of the first telescopic rod is embedded in the fixed seat on the corresponding side, and the other end of the first telescopic rod is connected to the arc plate on the corresponding side. The fixed seat is connected to the arc plate on the corresponding side through the first telescopic rod.

[0009] In a preferred embodiment of the present invention, the other end of the first support rod is rotatably connected to the inner wall of the corresponding groove on the right side via a second pin on the right side, and the other end of the second support rod is rotatably connected to the inner wall of the corresponding groove on the left side via a second pin on the left side.

[0010] In a preferred embodiment of the present invention, there are two supports, symmetrically distributed front and back, and the supports are U-shaped. The bottom sides of each support are welded and fixed to two fixed seats respectively. The inner walls of the supports are provided with vertical grooves on both the left and right sides. A lifting frame is provided inside the support, and sliders are provided on the left and right sides of the lifting frame. The sliders on the left and right sides of the lifting frame are inserted into the corresponding grooves and slide in cooperation with the corresponding grooves. Fixed cylinders are vertically provided on the front and rear sides of the lifting frame. A through groove is provided at the top of the support. A locking block is provided near the bottom on the inner wall of the through groove. A bearing is provided at the upper part of the through groove, and a screw is vertically inserted through the bearing. The screw rotates in cooperation with the support through the bearing. A traction mechanism is installed at the middle of the top of the support.

[0011] As a preferred embodiment of the present invention, the lifting frame has a rectangular frame structure, and sliders are provided at the four corners of the lifting frame. The lifting frame is slidably connected to the bracket by the sliders at the four corners engaging in the corresponding sliding grooves. The bottom of the lifting frame is in contact with the top of the upper support mechanism.

[0012] As a preferred embodiment of the present invention, the inner hole of the fixed cylinder is configured as an internal threaded hole, and a slot is vertically provided on the side wall of the fixed cylinder. The locking block is inserted into the corresponding slot. The bottom of the fixed cylinder is welded and fixed to the lifting frame. The top of the fixed cylinder slides up and down with the through groove. The lower part of the screw is inserted into the threaded hole and forms a threaded connection with the fixed cylinder.

[0013] As a preferred embodiment of the present invention, the traction mechanism includes a guide wheel and a traction rope. A guide wheel is rotatably mounted on the top middle part of each bracket. One end of the traction rope is connected to the first pin of the upper support mechanism on the corresponding side, and the other end of the traction rope passes around the guide wheel on the corresponding side and is connected downward to the first pin of the lower support mechanism.

[0014] As a preferred embodiment of the present invention, the clamping mechanism includes fixing ears and bolts. Fixing ears are fixedly provided on the front and rear sides of the top ends of the two arc-shaped plates, and a through hole is provided in the middle of each fixing ear. One bolt passes through the through holes on the two fixing ears on the front side, and another bolt passes through the through holes on the two fixing ears on the rear side.

[0015] In a preferred embodiment of the present invention, the detonation circuit protection mechanism includes a second telescopic rod, a second spring, a hook, and a connecting rod. Multiple second telescopic rods are sequentially arranged from top to bottom on the inner wall of one of the arc-shaped plates. The connecting rod is vertically arranged and close to the inner wall of the arc-shaped plate on which the second telescopic rods are installed. One end of the second telescopic rod is connected to the inner wall of the corresponding arc-shaped plate, and the other end of the second telescopic rod is connected to a hook. The hook is connected to the connecting rod. A second spring is sleeved on the second telescopic rod. One end of the second spring is connected to the inner wall of the arc-shaped plate on the corresponding side, and the other end of the second spring is connected to the hook. A lever is connected to the top of the connecting rod.

[0016] A method for blasting explosives in underground metal mining, the method employing the aforementioned blasting explosives device for underground metal mining, the method comprising the following steps:

[0017] S1: Before loading the explosive, insert the unexpanded arc plate into the borehole, clear the borehole with the arc plate and insert it into the bottom of the borehole, step on the fixing seat with your foot so that the ground cone at the bottom of the borehole is inserted into the ground;

[0018] S2: Rotate the screw, which rotates in the screw hole inside the fixed cylinder, driving the lifting frame to move downward. The lifting frame presses against the top of the upper support mechanism, pushing the first support rod and the second support rod on the upper support mechanism to rotate relative to the two arc-shaped plates, and the included angle between the first support rod and the second support rod on the upper support mechanism increases. At the same time, the first pin on the upper support mechanism moves downward, pulling one end of the traction rope on the corresponding side downward. The other end of the traction rope pulls the first pin on the lower support mechanism on the corresponding side upward. The first support rod and the second support rod on the lower support mechanism rotate relative to the two arc-shaped plates, and the included angle between the first support rod and the second support rod on the lower support mechanism increases. As the upper support mechanism and the lower support mechanism expand, they push the two arc-shaped plates to press against the inner wall of the blast hole in a direction away from each other.

[0019] S3: Insert a charge with an initiation circuit into the hole between the two arc plates. The charge falls to the bottom of the borehole under the action of gravity.

[0020] S4: By pulling the lever, the connecting rod moves toward the center of the borehole. The connecting rod pulls several hooks to move. The second telescopic rod and the second spring extend, so that the hooks hook the detonation circuit of the detonating charge. Then, the lever is released, and the rebound force of the second spring pulls the hooks back to their original position. The hooks pull the detonation circuit to the inner wall of the arc plate close to the corresponding side for protection.

[0021] S5: Then, charge packages without detonation circuits are successively placed in the borehole, and multiple charge packages are stacked in sequence to fill the borehole until the specified number is reached;

[0022] S6: When too many explosive charges are put in or the detonation circuit is damaged, the screw is rotated in the opposite direction to drive the fixed cylinder and the lifting frame to move up and reset. The first torque spring and the second torque spring rebound to drive the first support rod and the second support rod on the upper support mechanism and the lower support mechanism to retract, so that the two arc plates move closer to each other. Then, the two fixing ears on the corresponding sides are tightened by bolts to keep the two arc plates stable. The two arc plates carry out the internal detonation explosive charge for replacement.

[0023] S7: After the charge is completed, pull the arc plate to move the arc plate upward relative to the charge package and remove the arc plate in the expanded state from the borehole;

[0024] S8: Plug the gun hole with a wooden stopper to complete the charging.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] 1. The underground metal mine blasting charging device and method of the present invention, by setting up an upper support mechanism, a lower support mechanism, an arc plate and a fixed seat, and by moving the lifting frame down in the support, pushes the upper support mechanism to expand. The upper support mechanism drives the lower support mechanism to expand through the traction mechanism. The upper and lower support mechanisms respectively push the upper and lower ends of the two arc plates away from each other, so as to achieve the effect of pushing the arc plate to expand and compress the inner wall of the blast hole. On the one hand, the arc plate compacts the soil and gravel on the inner wall of the blast hole, expanding the charging space in the blast hole. On the other hand, the arc plate isolates the rough inner wall of the blast hole, so that the explosive charge contacts the smooth inner wall of the arc plate and falls smoothly. This can effectively avoid the situation of the explosive charge tilting and causing blockage during the charging process, making the charging of explosives in the blast hole faster and more convenient.

[0027] 2. The underground metal mining blasting charging device and method of the present invention, through the set traction mechanism, during the expansion of the upper support mechanism, the first support rod and the second support rod rotate relative to each other, the included angle between them increases, and at the same time the first pin moves down and pulls one end of the traction rope down, while the other end of the traction rope pulls the first pin on the lower support mechanism up. With the arc plate as a whole still, the first pin on the lower support mechanism moves up and pulls the lower support mechanism to expand, so as to achieve the effect of simultaneous and stable expansion of both ends of the arc plate.

[0028] 3. The underground metal mine blasting charging device and method of the present invention, by setting up a detonation circuit protection mechanism, after the explosive charge with the detonation circuit is placed in, the connecting rod is moved towards the center of the blast hole by a lever, the connecting rod moves several hooks, the second telescopic rod and the second spring extend, so that the hooks hook the detonation circuit of the explosive charge. Then the lever is released, and the rebound force of the second spring pulls the hooks back to their original position. The hooks pull the detonation circuit to the side close to the inner wall of the arc plate for protection. On the one hand, the hooks position the detonation circuit to prevent the detonation circuit from moving and rubbing against the inner wall of the blast hole. On the other hand, the hooks separate other explosive charges from the detonation circuit to prevent the explosive charge from falling and squeezing the detonation circuit during the charging process, thus achieving the protective effect of the explosive charge detonation circuit.

[0029] 4. The underground metal mine blasting charging device and method of the present invention, by setting a clamping mechanism, when too many explosive charges are put in or the detonation circuit is damaged, the screw rotates in the opposite direction to drive the fixed cylinder and the lifting frame to move upward and reset. The first torque spring and the second torque spring rebound to drive the upper support mechanism and the lower support mechanism to contract, so that the two arc plates are brought closer to each other. Then, the fixing lugs are tightened by bolts to keep the two arc plates stable. The detonation charge inside the blast hole is taken out and replaced by the clamping action of the two arc plates, thereby increasing the replaceable explosive charge function of the device. Attached Figure Description

[0030] Figure 1 A schematic cross-sectional view of a blasting charging device for underground metal mining.

[0031] Figure 2 A schematic diagram of the structure in the expanded state of two arc-shaped plates;

[0032] Figure 3 A three-dimensional structural schematic diagram of a blasting charging device for underground metal mining;

[0033] Figure 4 This is a structural diagram of the upper support mechanism and the traction mechanism;

[0034] Figure 5 This is a schematic diagram of the structure connecting the support frame and the lifting frame;

[0035] Figure 6 This is an exploded view of the upper support mechanism.

[0036] Figure 7 This is a schematic diagram of the detonation circuit protection mechanism.

[0037] In the diagram, 1—arc plate; 2—fixed seat; 21—first telescopic rod; 22—first spring; 23—ground cone; 3—bracket; 31—slide groove; 32—lifting frame; 33—slider; 34—fixed cylinder; 341—screw hole; 342—slot; 35—through groove; 36—block; 37—screw; 38—bearing; 39—traction mechanism; 391—guide wheel; 392—traction rope; 4—groove; 5—upper support mechanism; 51—first support rod; 52—second support rod; 53—first pin; 54—first torque spring; 55—second pin; 56—second torque spring; 6—lower support mechanism; 7—clamping mechanism; 71—fixed ear; 72—through hole; 73—bolt; 8—detonation circuit protection mechanism; 81—second telescopic rod; 82—second spring; 83—hook; 84—connecting rod; 85—pulling block. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, an underground metal mine blasting charging device includes two symmetrically arranged arc-shaped plates 1. The concave arc surfaces of the two arc-shaped plates 1 correspond to each other, and the gaps between the front and rear sides of the two arc-shaped plates 1 are both smaller than the outer diameter of the explosive charge. Fixed seats 2 are connected to the top of the two arc-shaped plates 1 on opposite sides; that is, a fixed seat 2 is connected to the left side of the left arc-shaped plate 1, and another fixed seat 2 is connected to the right side of the right arc-shaped plate 1. A first telescopic rod 21 connects the fixed seat 2 to the corresponding arc-shaped plate 1. The fixed seat 2 is connected to the corresponding arc-shaped plate 1 via the first telescopic rod 21, and a first spring 22 is sleeved on the first telescopic rod 21. Figure 4As shown, after the fixed base 2 is fixed, the arc-shaped plate 1 can expand and move towards one side of the fixed base 2 by the extension and retraction of the first spring 22. A bracket 3 is connected between the tops of the two fixed bases 2; there are two brackets 3, as shown... Figure 3 and Figure 5 As shown, two supports 3 are symmetrically distributed between the tops of two fixed seats 2, and the supports 3 are inverted U-shape (i.e., door frame structure). The bottom sides of the supports 3 are welded and fixed to the two fixed seats 2 respectively. Grooves 4 are provided at the upper and lower ends of the two arc-shaped plates 1 near the front and rear edges. Upper support mechanisms 5 are installed in the two grooves 4 on the front side and the two grooves 4 on the rear side of the upper end of the two arc-shaped plates 1, respectively, to support the upper expansion of the two arc-shaped plates 1. Lower support mechanisms 6 are installed in the two grooves 4 on the front side and the two grooves 4 on the rear side of the lower end of the two arc-shaped plates 1, respectively, to support the lower expansion of the two arc-shaped plates 1. Clamping mechanisms 7 are connected to the top of the front and rear side walls of the left and right arc-shaped plates 1. An initiation circuit protection mechanism 8 is installed on the inner wall of one of the arc-shaped plates 1, which is used to protect the initiation circuit.

[0040] Both the upper support mechanism 5 and the lower support mechanism 6 include a first support rod 51, a second support rod 52, a first pin 53, and a second pin 55, as shown below. Figure 6 As shown. A first pin 53 passes through one end of a first support rod 51 and one end of a second support rod 52. One end of the first support rod 51 and one end of the second support rod 52 are rotatably connected by the first pin 53. A first torque spring 54 is sleeved on the outside of the first pin 53 and the second support rod 52. One end of the first torque spring 54 is connected to the end of the first pin 53, and the other end of the first torque spring 54 is connected to one end of the first support rod 51 or the second support rod 52. The other ends of the first support rod 51 and the second support rod 52 are far apart from each other, and the other end of the first support rod 51 is rotatable through the second pin 55. The second support rod 52 is placed in the groove 4 on the right side, and the other end of the second support rod 52 is rotatably set in the groove 4 on the left side via the second pin 55. A second torque spring 56 is sleeved on the outer side of each second pin 55. One end of the second torque spring 56 is connected to the inner wall of the corresponding groove 4, and the other end is connected to the other end of the corresponding first support rod 51 or second support rod 52. The first torque spring 54 and the second torque spring 56 are in a normally stretched state when the first support rod 51 and the second support rod 52 retract. The first torque spring 54 and the second torque spring 56 are used to drive the retraction of the extended upper support mechanism 5 and the lower support mechanism 6. When the upper support mechanism 5 and the lower support mechanism 6 are in a free state, the first pin 53 on the upper support mechanism 5 and the first pin 53 on the lower support mechanism 6 are vertically separated from each other, such as... Figure 1 As shown.

[0041] The bottom of the fixing bases 2 on both the left and right sides are fixedly connected to ground cones 23, such as Figure 1 and Figure 2 As shown, the ground cone 23 is used to stably position the fixed seat 2 on the outer side of the top of the blast hole. During use, the user steps on the fixed seat 2, allowing the arc plate 1 to move stably relative to the fixed seat 2 when it expands. One end 21 of the first telescopic rod is embedded in the fixed seat 2 on the corresponding side, and the other end 21 of the first telescopic rod is connected to the arc plate 1 on the corresponding side. The fixed seat 2 is connected to the arc plate 1 on the corresponding side through the first telescopic rod 21. When the arc plate 1 expands, the first spring 22 is compressed, and the first telescopic rod 21 retracts. When the arc plate 1 loses the thrust of the first support rod 51 and the second support rod 52, the first spring 22 rebounds and pushes the arc plate 1 back to its original position.

[0042] The other end of the first support rod 51 is rotatably connected to the inner wall of the corresponding groove 4 on the right side via the second pin 55 on the right side, and the other end of the second support rod 52 is rotatably connected to the inner wall of the corresponding groove 4 on the left side via the second pin 55 on the left side. The two arc-shaped plates 1 are connected by the first support rod 51 and the second support rod 52. During the movement of the first pin 53 toward one side of the arc-shaped plate 1 (i.e., the first pin 53 on the upper support mechanism 5 moves down and the first pin 53 on the lower support mechanism 6 moves up), one end of the first support rod 51 and one end of the second support rod 52 rotate relative to each other, and the other end of the first support rod 51 and the other end of the second support rod 52 rotate relative to the arc-shaped plate 1 on the corresponding side. The included angle between the first support rod 51 and the second support rod 52 increases, thereby pushing the two arc-shaped plates 1 away from each other.

[0043] The bracket 3 has vertically arranged grooves 31 on both the left and right sides of its inner wall. A lifting frame 32 is installed inside the bracket 3, and sliders 33 are provided on both the left and right sides of the lifting frame 32. The cross-sections of the sliders 33 and the grooves 31 are both T-shaped. The sliders 33 on the left and right sides of the lifting frame 32 are inserted into the corresponding grooves 31 and slide in cooperation with them. Fixed cylinders 34 are vertically arranged on the front and rear sides of the lifting frame 32, and both front and rear fixed cylinders 34 are hollow cylindrical. A through groove 35 is provided at the top of the bracket 3. A locking block 36 is provided near the bottom of the inner wall of the through groove 35. A bearing 38 is provided at the upper part of the through groove 35, and a screw 37 is vertically inserted through the bearing 38. The screw 37 rotates with the bracket 3 through the bearing 38. A traction mechanism 39 is installed in the middle of the top of the bracket 3.

[0044] The lifting frame 32 has a rectangular frame structure, and sliders 33 are provided at each of the four corners of the lifting frame 32. Figure 5As shown, the lifting frame 32 is slidably connected to the bracket 3 by the sliders 33 at its four corners engaging with the corresponding grooves 31, thus enabling the lifting frame 32 to slide up and down within the bracket 3. The bottom of the lifting frame 32 contacts the top of the upper support mechanism 5. As the lifting frame 32 moves downward within the bracket 3, it presses against the top of the upper support mechanism 5, causing the first pin 53 to move downward, and the first support rod 51 and the second support rod 52 to rotate and expand.

[0045] The inner hole of the fixed cylinder 34 is configured as an internal threaded hole 341. A slot 342 is vertically provided on the side wall of the fixed cylinder 34. A locking block 36 is inserted into the corresponding slot 342. The width of the locking block 36 is adapted to the width of the slot 342. When the top of the fixed cylinder 34 is inserted into the through slot 35, the locking block 36 is inserted into the slot 342, increasing the stability of the fixed cylinder 34 in raising and lowering. The bottom of the fixed cylinder 34 is welded and fixed to the lifting frame 32. The top of the fixed cylinder 34 slides up and down with the through slot 35. The lower part of the screw 37 is inserted into the threaded hole 341 and forms a threaded connection with the fixed cylinder 34. By rotating the screw 37, the screw 37 drives the fixed cylinder 34 to move down through the threaded hole 341. The fixed cylinder 34 drives the lifting frame 32 to move down, and the lifting frame 32 presses against the upper support mechanism 5.

[0046] The traction mechanism 39 includes a guide wheel 391 and a traction rope 392. One traction mechanism 39 is respectively installed on each of the front and rear supports 3. Figure 1 and Figure 2 As shown, a guide wheel 391 is rotatably mounted at the top center of each bracket 3. One end of the traction rope 392 is connected to the first pin 53 of the upper support mechanism 5 on the corresponding side, and the other end of the traction rope 392 passes around the guide wheel 391 on the corresponding side and connects downward to the first pin 53 of the lower support mechanism 6. During the process of the lifting frame 32 pushing the upper support mechanism 5 to expand, the first pin 53 moves downward. At this time, the first pin 53 pulls one end of the traction rope 392 on the corresponding side to move downward. Since the traction rope 392 is in a taut state, the other end of the traction rope 392 pulls the first pin 53 on the lower support mechanism 6 to move upward. The upward movement of the first pin 53 on the lower support mechanism 6 pulls the lower support mechanism 6 to expand, achieving the effect of simultaneous and stable expansion of the upper and lower ends of the two arc-shaped plates 1.

[0047] The clamping mechanism 7 includes a fixing lug 71 and a bolt 73, such as Figure 3 , Figure 4 and Figure 7As shown, two curved plates 1 are respectively fixed with fixing ears 71 on the front and rear sides of the top end. Each fixing ear 71 has a through hole 72 in the middle. A bolt 73 passes through the through hole 72 on the two fixing ears 71 on the front side. The two fixing ears 71 on the front side are connected by a bolt 73 and a nut. Another bolt 73 passes through the through hole 72 on the two fixing ears 71 on the rear side. The two fixing ears 71 on the rear side are connected by another bolt 73 and another nut. When too many explosive charges are placed in the device or the detonation circuit is damaged, the upper support mechanism 5 and the lower support mechanism 6 are controlled to retract. The two arc-shaped plates 1 are pressed against the explosive charges by the rebound force of the first spring 22. To prevent relative movement between the arc-shaped plates 1 and the explosive charges, the fixing ears 71 are fastened by bolts 73 to maintain the stability of the two arc-shaped plates 1. The detonating explosive charges inside the borehole are brought out and replaced through the clamping action of the two arc-shaped plates 1, increasing the replaceable explosive charge function of the device. During the tightening of the fixing ears 71, care should be taken not to clamp too tightly to avoid excessive squeezing of the explosive charges by the two arc-shaped plates 1.

[0048] The detonation circuit protection mechanism 8 includes a second telescopic rod 81, a second spring 82, a hook 83, and a connecting rod 84, such as Figure 7 As shown, multiple second telescopic rods 81 are arranged sequentially from top to bottom on the inner wall of one of the arc-shaped plates 1. A connecting rod 84 is vertically arranged and close to the inner wall of the arc-shaped plate 1 on which the second telescopic rods 81 are installed. One end of the second telescopic rod 81 is connected to the inner wall of the corresponding arc-shaped plate 1. In this embodiment, a cavity is provided on the inner wall of the arc-shaped plate 1. One end of the second telescopic rod 81 is embedded in the cavity. The other end of the second telescopic rod 81 is connected to a hook 83. The hook 83 is connected to the connecting rod 84. A second spring 82 is sleeved on the second telescopic rod 81. One end of the second spring 82 is connected to the inner wall of the arc-shaped plate 1 on the corresponding side. The other end of the second spring 82 is connected to the hook 83. A lever 85 is connected to the top of the connecting rod 84. Hook 83 pulls the detonation line closer to the inner wall of the arc plate 1 for protection. On the one hand, hook 83 positions the detonation line to prevent it from moving and rubbing against the inner wall of the borehole. On the other hand, hook 83 separates other explosive charges from the detonation line to prevent the explosive charges from falling and squeezing the detonation line during the loading process, thus achieving the protection of the explosive charge detonation line.

[0049] A method for blasting explosives in underground metal mining, comprising the above-mentioned underground metal mining blasting explosive charging device, wherein the operator installs the underground metal mining blasting explosive charging device above a vertical deep hole in the metal mine to be blasted, and the method includes the following steps:

[0050] S1: Before loading the explosive, insert the two unexpanded arc plates 1 into the borehole, clear the borehole with the arc plates 1 and insert them into the bottom of the borehole, and step on the fixing seat 2 with your foot so that the ground cone 23 at the bottom of the borehole is inserted into the ground.

[0051] S2: Rotate screw 37. Screw 37 rotates in screw hole 341 inside fixed cylinder 34, driving lifting frame 32 to move downward. Lifting frame 32 presses against the top of upper support mechanism 5, pushing the first support rod 51 and second support rod 52 on upper support mechanism 5 to rotate relative to the two arc plates 1, and the included angle between the first support rod 51 and second support rod 52 on upper support mechanism 5 increases. At the same time, the first pin 53 on upper support mechanism 5 moves downward, pulling one end of the traction rope 392 on the corresponding side downward. The other end of 2 pulls the first pin 53 on the corresponding side of the lower support mechanism 6 to move upward. The first support rod 51 and the second support rod 52 on the lower support mechanism 6 rotate relative to the two arc plates 1, and the included angle between the first support rod 51 and the second support rod 52 on the lower support mechanism 6 increases. While the upper support mechanism 5 and the lower support mechanism 6 expand, they push the two arc plates 1 to squeeze the inner wall of the blast hole in a direction away from each other. The two arc plates 1 compact the soil and gravel on the inner wall of the blast hole, expanding the charging space inside the blast hole.

[0052] S3: Insert a charge with an initiation circuit into the hole between the two arc plates 1. The inner walls of the two arc plates 1 are relatively smooth, which facilitates the smooth fall of the charge. The charge falls freely into the bottom of the borehole under the action of gravity.

[0053] S4: Pull the connecting rod 84 towards the center of the blast hole by the lever 85. The connecting rod 84 pulls several hooks 83 to move. The second telescopic rod 81 and the second spring 82 extend, so that the hooks 83 hook the detonation circuit of the detonating charge. Then release the lever 85. The rebound force of the second spring 82 pulls the hooks 83 back to their original position. The hooks 83 pull the detonation circuit to the inner wall of the arc plate 1 on the corresponding side for protection.

[0054] S5: Then, charge packages without detonation circuits are successively placed in, and multiple charge packages are stacked in sequence to fill the blast hole until the specified number is reached.

[0055] S6: When too many explosive charges are put in or the detonation circuit is damaged, the screw 37 is rotated in the opposite direction to drive the fixed cylinder 34 and the lifting frame 32 to move upward and reset. The first torque spring 54 and the second torque spring 56 rebound to drive the first support rod 51 and the second support rod 52 on the upper support mechanism 5 and the lower support mechanism 6 to retract, so that the two arc plates 1 move closer to each other. Then, the two fixed ears 71 on the corresponding sides are tightened by the bolts 73 to keep the two arc plates 1 stable. The two arc plates 1 carry out the internal detonation explosive charge for replacement.

[0056] S7: After the charge is completed, slowly pull the support 3 upwards. The ground cone 23 at the bottom of the fixed seat 2 is pulled out of the ground. Continue to pull the arc plate 1 upwards so that the arc plate 1 moves upwards relative to the charge package. Remove the arc plate 1 from the borehole in the expanded state.

[0057] S8: Plug the gun hole with a wooden stopper to complete the charging.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A blasting charging device for underground metal mining, characterized in that: The device includes two symmetrically arranged arc-shaped plates (1), with their concave arc surfaces corresponding to each other. A fixed seat (2) is connected to the top of each of the two arc-shaped plates (1) on opposite sides. A first telescopic rod (21) connects the fixed seat (2) to the corresponding arc-shaped plate (1), and a first spring (22) is fitted onto the first telescopic rod (21). A bracket (3) connects the tops of the two fixed seats (2). Concave arcs are provided at the upper and lower ends of the two arc-shaped plates (1) near their front and rear edges. The groove (4) is equipped with an upper support mechanism (5) in the two grooves (4) on the front side of the upper end of the two arc plates (1) and the two grooves (4) on the rear side. The grooves (4) on the front side of the lower end of the two arc plates (1) and the two grooves (4) on the rear side are equipped with a lower support mechanism (6). The top of the front side wall and the top of the rear side wall of the two arc plates (1) are connected with clamping mechanisms (7). The inner wall of one of the arc plates (1) is equipped with an initiation circuit protection mechanism (8). Both the upper support mechanism (5) and the lower support mechanism (6) include a first support rod (51), a second support rod (52), a first pin (53), and a second pin (55). The first pin (53) passes through one end of the first support rod (51) and one end of the second support rod (52). One end of the first support rod (51) and one end of the second support rod (52) are rotatably connected by the first pin (53). A first torque spring (54) is sleeved on the outside of the first support rod (51) and the second support rod (52). One end of the first torque spring (54) is connected to the end of the first pin (53), and the other end of the first torque spring (54) is connected to one end of the first support rod (51) or the second support rod (52). The other end of the support rod (51) is far away from the other end of the second support rod (52), and the other end of the first support rod (51) is rotatably set in the groove (4) on the right side through the second pin (55), and the other end of the second support rod (52) is rotatably set in the groove (4) on the left side through the second pin (55). A second torque spring (56) is sleeved on the outside of each second pin (55). One end of the second torque spring (56) is connected to the inner wall of the corresponding groove (4), and the other end of the second torque spring (56) is connected to the other end of the corresponding first support rod (51) or second support rod (52). The first pin (53) on the upper support mechanism (5) and the first pin (53) on the lower support mechanism (6) are far away from each other in the vertical direction. There are two brackets (3), which are symmetrically distributed front and back, and the brackets (3) are inverted U-shapes. The bottom sides of the brackets (3) are welded and fixed to two fixed seats (2) respectively. The inner walls of the brackets (3) are provided with vertical grooves (31) on both the left and right sides. A lifting frame (32) is provided inside the brackets (3). The left and right sides of the lifting frame (32) are provided with sliders (33). The sliders (33) on the left and right sides of the lifting frame (32) are inserted into the corresponding grooves (31) and are connected to the corresponding sliders. The groove (31) is slidably fitted; a fixed cylinder (34) is vertically installed on the front and rear sides of the lifting frame (32); a through groove (35) is provided on the top of the bracket (3); a locking block (36) is provided on the inner wall of the through groove (35) near the bottom; a bearing (38) is provided on the upper part of the through groove (35); a screw (37) is vertically inserted in the bearing (38); the screw (37) is rotatably fitted with the bracket (3) through the bearing (38); and a traction mechanism (39) is installed in the middle part of the top of the bracket (3). The traction mechanism (39) includes a guide wheel (391) and a traction rope (392). A guide wheel (391) is rotatably mounted on the top middle part of each bracket (3). One end of the traction rope (392) is connected to the first pin (53) of the upper support mechanism (5) on the corresponding side. The other end of the traction rope (392) passes around the guide wheel (391) on the corresponding side and is connected downward to the first pin (53) of the lower support mechanism (6).

2. The blasting charging device for underground metal mining according to claim 1, characterized in that: The bottom of the fixed seats (2) on both the left and right sides is fixedly connected with ground cones (23). One end of the first telescopic rod is embedded in the fixed seat (2) on the corresponding side. The other end of the first telescopic rod is connected to the arc plate (1) on the corresponding side. The fixed seat (2) is connected to the arc plate (1) on the corresponding side through the first telescopic rod (21).

3. The blasting charging device for underground metal mining according to claim 2, characterized in that: The other end of the first support rod (51) is rotatably connected to the inner wall of the corresponding groove (4) on the right side via the second pin (55) on the right side, and the other end of the second support rod (52) is rotatably connected to the inner wall of the corresponding groove (4) on the left side via the second pin (55) on the left side.

4. The blasting charging device for underground metal mining according to claim 3, characterized in that: The lifting frame (32) has a rectangular frame structure. Slider (33) is provided at each of the four corners of the lifting frame (32). The lifting frame (32) is connected to the bracket (3) by the slider (33) at the four corners in the corresponding groove (31). The bottom of the lifting frame (32) is in contact with the top of the upper support mechanism (5).

5. The blasting charging device for underground metal mining according to claim 4, characterized in that: The inner hole of the fixed cylinder (34) is set as an internal threaded hole. A slot (342) is vertically provided on the side wall of the fixed cylinder (34). The locking block (36) is inserted into the corresponding slot (342). The bottom of the fixed cylinder (34) is welded and fixed to the lifting frame (32). The top of the fixed cylinder (34) slides up and down with the through groove (35). The lower part of the screw (37) is inserted into the screw hole (341) and forms a threaded connection with the fixed cylinder (34).

6. The blasting charging device for underground metal mining according to claim 5, characterized in that: The clamping mechanism (7) includes a fixing ear (71) and a bolt (73). The front and rear sides of the top of the two arc plates (1) are respectively fixed with fixing ears (71). Each fixing ear (71) has a through hole (72) in the middle. One bolt (73) passes through the through hole (72) on the two fixing ears (71) on the front side, and another bolt (73) passes through the through hole (72) on the two fixing ears (71) on the rear side.

7. The blasting charging device for underground metal mining according to claim 6, characterized in that: The detonation circuit protection mechanism (8) includes a second telescopic rod (81), a second spring (82), a hook (83), and a connecting rod (84). Multiple second telescopic rods (81) are arranged sequentially from top to bottom on the inner wall of one of the arc-shaped plates (1). The connecting rod (84) is vertically arranged and close to the inner wall of the arc-shaped plate (1) on which the second telescopic rods (81) are installed. One end of the second telescopic rod (81) is connected to the inner wall of the corresponding arc-shaped plate (1). The other end of the second telescopic rod (81) is connected to a hook (83). The hook (83) is connected to the connecting rod (84). A second spring (82) is sleeved on the second telescopic rod (81). One end of the second spring (82) is connected to the inner wall of the arc-shaped plate (1) on the corresponding side. The other end of the second spring (82) is connected to the hook (83). A lever (85) is connected to the top of the connecting rod (84).

8. A method for blasting explosives in underground metal mining, characterized in that, This method employs the blasting charging device for underground metal mining as described in claim 7, and includes the following steps: S1: Before loading the explosive, insert the unexpanded arc plate (1) into the borehole, clear the borehole with the arc plate (1) and insert it into the bottom of the borehole, step on the fixing seat (2) with your foot to insert the ground cone (23) at the bottom into the ground; S2: Rotate the screw (37), which rotates in the screw hole (341) inside the fixed cylinder (34), driving the lifting frame (32) to move down. The lifting frame (32) presses against the top of the upper support mechanism (5), pushing the first support rod (51) and the second support rod (52) on the upper support mechanism (5) to rotate relative to the two arc plates (1), and the included angle between the first support rod (51) and the second support rod (52) on the upper support mechanism (5) increases. At the same time, the first pin (53) on the upper support mechanism (5) moves down and pulls the corresponding... One end of the traction rope (392) on the side moves down, and the other end of the traction rope (392) pulls the first pin (53) on the corresponding side of the lower support mechanism (6) to move up. The first support rod (51) and the second support rod (52) on the lower support mechanism (6) rotate relative to the two arc plates (1), and the included angle between the first support rod (51) and the second support rod (52) on the lower support mechanism (6) increases. While the upper support mechanism (5) and the lower support mechanism (6) expand, they push the two arc plates (1) to squeeze the inner wall of the blast hole in a direction away from each other. S3: Insert a charge with an initiation circuit into the hole between the two arc plates (1), and the charge falls into the bottom of the borehole under the action of gravity; S4: Pull the connecting rod (84) towards the center of the blast hole by using the lever (85). The connecting rod (84) pulls several hooks (83) to move. The second telescopic rod (81) and the second spring (82) extend, so that the hooks (83) hook the detonation line of the detonating charge. Then release the lever (85). The rebound force of the second spring (82) pulls the hooks (83) back to their original position. The hooks (83) pull the detonation line to the inner wall of the arc plate (1) close to the corresponding side for protection. S5: Then, charge packages without detonation circuits are successively placed in the borehole, and multiple charge packages are stacked in sequence to fill the borehole until the specified number is reached; S6: When too many explosive charges are put in or the detonation circuit is damaged, the screw (37) is rotated in the opposite direction to drive the fixed cylinder (34) and the lifting frame (32) to move up and reset. The first torque spring (54) and the second torque spring (56) rebound to drive the first support rod (51) and the second support rod (52) on the upper support mechanism (5) and the lower support mechanism (6) to retract, so that the two arc plates (1) are close to each other. Then, the two fixed ears (71) on the corresponding sides are tightened by bolts (73) to keep the two arc plates (1) stable. The two arc plates (1) will carry out the internal detonation explosive charge for replacement. S7: After the charge is completed, pull the arc plate (1) to move the arc plate (1) upward relative to the charge package and remove the arc plate (1) in the extended state from the borehole; S8: Plug the gun hole with a wooden stopper to complete the charging.

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