Medicine feeding rod for shaped charge blasting, blasting assembly and application thereof

Abstract

The application belongs to the technical field of blasting, and particularly discloses a medicine feeding rod for shaped charge blasting, a blasting assembly and application thereof. The medicine feeding rod comprises a hollow adjusting rod and a control rod connected perpendicularly with the rod body at the rear part of the adjusting rod; the front end of the adjusting rod is connected with an adjusting head, the adjusting head comprises an adjusting shell and a bolt, the adjusting shell is provided with an adjusting assembly, the rear end of the bolt passes through the front end surface of the adjusting shell and is connected with the adjusting assembly, and the front end of the bolt is inserted with a shaped charge tube; an operation handle is hinged on the control rod, the operation handle is connected with the adjusting assembly through an adjusting pull wire, and when the adjusting pull wire is tightened, the adjusting assembly is contracted to make the bolt retract and be separated from the shaped charge tube. The medicine feeding tube has simple overall structure and is convenient to operate, can effectively adjust the direction of the shaped charge tube to realize precise blasting, and can reduce the disturbance to surrounding protective objects and improve the excavation effect when the medicine feeding rod and the shaped charge tube are combined and applied to the foundation pit shallow hole blasting.

Description

[Technical Field]

[0001] This invention relates to the field of blasting technology, and in particular to a shaped charge blasting feed rod, blasting assembly, and their applications. [Background Technology]

[0002] During blasting operations, the detonation of explosives in the blast hole generates a powerful shock wave and high-pressure gas, causing the surrounding rock mass to fracture and crack. In many engineering projects in my country, such as open-pit mine slopes, hydraulic structures, tunnels, building foundation pits, and the excavation of underground structures, it is necessary to control the blasting boundary to avoid over-excavation and under-excavation, while keeping the rock mass at the excavation boundary as intact and stable as possible.

[0003] Smooth blasting technology mainly uses shaped charge blasting to achieve directional pre-splitting and cutting of rocks. It can fully utilize the energy of explosives to generate directional cracks, control the expansion of blast cracks in a set direction, suppress cracks in unfavorable directions, reduce damage to the strength and integrity of surrounding rock in non-set directions, protect the stability of surrounding rock in non-set directions, increase the spacing between pre-splitting blast holes, and reduce the consumption of pre-splitting explosives. It is beneficial to reduce blasting disturbance to tunnel surrounding rock and slope rock mass, and is more conducive to the long-term stability of surrounding rock structure after excavation and unloading. Therefore, it has been widely used and vigorously developed in the construction of tunnels, slopes, hydropower stations, and building foundation pits.

[0004] When using shaped charge blasting technology, shaped charge explosive tubes are required. To achieve a good blasting effect, the shaped charge tube's charging groove needs to be aligned with the set blasting direction. However, currently there are no specialized adjustment tools for adjusting the position of the shaped charge explosive tube in the blast hole; instead, workers manually fill the blast holes. This method, lacking specialized equipment, is prone to errors during filling, causing the charging groove of the shaped charge explosive tube to misalign with the set blasting direction. This results in errors in the blasting cut direction, affecting the control of the blasting effect. [Summary of the Invention]

[0005] In view of the above, it is necessary to provide a delivery pipe, blasting components and their applications for shaped charge blasting. The delivery pipe has a simple overall structure and is easy to operate. It can effectively adjust the direction of the shaped charge blasting explosive pipe to achieve precise blasting. Furthermore, the combination of the delivery rod and the shaped charge blasting explosive pipe in shallow hole blasting of foundation pits can reduce the disturbance to the surrounding protected objects and improve the excavation effect.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A shaped charge delivery rod for explosive charges includes a hollow adjusting rod and a control rod. The control rod is perpendicularly connected to the rear section of the adjusting rod. An adjusting head is connected to the front end of the adjusting rod. The adjusting head includes an adjusting housing and a pin. The adjusting housing communicates with the adjusting rod and has an adjusting assembly. A through hole adapted to the pin is formed in the middle of the front face of the adjusting housing. The rear end of the pin is connected to the adjusting assembly through the through hole, and the front end of the pin is inserted into the rear end of the shaped charge explosive tube. An operating handle is hinged to the control rod. The operating handle is connected to the adjusting assembly via an adjusting cable. When the operating handle is turned, the adjusting cable tightens, causing the adjusting assembly to retract, thus retracting the pin into the adjusting housing and separating it from the shaped charge explosive tube.

[0008] Furthermore, the adjustment assembly includes a telescopic component and a limiting component. The telescopic component is connected to the pin to control the extension and retraction of the pin, and the limiting component is used to limit the telescopic component. The operating handle includes an unlocking handle and an exiting handle, which are respectively hinged to the left and right sides of the control lever. The exiting handle is connected to the telescopic component via one of the adjustment cables, and the unlocking handle is connected to the limiting component via another adjustment cable. When the unlocking handle is moved, the limiting component retracts and releases the limiting of the telescopic component. When the exiting handle is moved, the telescopic component retracts, causing the pin to retract into the adjustment housing.

[0009] Furthermore, the telescopic component includes a connecting seat, the front end of which is connected to the pin. A locking handle is vertically connected to each of the opposite sides of the middle portion of the connecting seat. An adjustment hole is formed along the length of each of the opposite sides of the adjusting housing. The free ends of the two locking handles extend out of the adjusting housing through the corresponding adjustment hole. A return spring is connected to the rear end of the connecting seat. A hanging rod is vertically connected between the inner walls of the opposite sides of the front end of the adjusting rod. The rear end of the return spring is connected to the hanging rod. An adjusting cable passes through the hanging rod and splits into two branches, each connected to the middle of one of the two locking handles. The return spring is in its natural state. When lowered, the pin extends out of the adjusting housing; the limiting component includes a limiting cylinder, a limiting spring, and a limiting rod. The limiting cylinder is located on the inner wall of the adjusting housing, with its lower end closed and its upper end open. The limiting spring is located inside the limiting cylinder, with its lower end connected to the bottom surface of the limiting cylinder. The upper end of the limiting spring is connected to the lower end of the limiting rod. Another adjusting pull line passes through the hanging rod and splits into two branches. The two branches pass through the bottom of the limiting cylinder and the limiting spring on the corresponding side in sequence and are connected to the lower end of the limiting rod. When the limiting spring is in its natural state, the limiting rod fixes the locking handle at the uppermost end of the adjusting hole.

[0010] Furthermore, the adjustment hole is shaped like the number 7, and the upper parts of the two adjustment holes face opposite directions laterally.

[0011] Furthermore, the connecting seat includes a front end plate, a rear end plate, and a turntable disposed between the front end plate and the rear end plate. The turntable is connected to the locking handle, and when the locking handle is subjected to force, the locking handle together with the turntable can rotate relative to the front end plate and the rear end plate.

[0012] Furthermore, the unlock handle and the exit handle are equipped with different color markings.

[0013] Furthermore, the adjusting rod is marked with a line corresponding to the position of the shaped charge slot of the shaped charge explosive tube.

[0014] Furthermore, the cross-section of the pin is trapezoidal.

[0015] The present invention also provides a blasting assembly, including the delivery rod and the shaped charge explosive tube. The shaped charge explosive tube has a V-shaped groove. The shaped charge explosive tube is filled with explosive and has an electronic digital detonator at its front end. The end face of the closed cap at the rear end of the shaped charge explosive tube has a plug interface adapted to the pin. The shaped charge explosive tube is connected to the delivery rod by plugging in through the plug interface and the pin.

[0016] This invention also provides an application of a blasting component in shallow hole blasting of foundation pits in complex environments, comprising the following steps:

[0017] (1) Opening holes: A ring of peripheral holes is evenly opened on the outline of the excavated foundation pit, a ring of slotting holes is evenly opened in the middle of the excavated foundation pit surface, and a ring of auxiliary holes is evenly opened between the peripheral holes and the slotting holes. The lines connecting the peripheral holes, the lines connecting the slotting holes and the lines connecting the auxiliary holes are parallel to each other.

[0018] (2) Loading: The shaped charge explosive tube is loaded into the peripheral hole, and the feeding rod is used to adjust so that the opening direction of the V-shaped groove is facing the same side of the excavation pit outline. The auxiliary hole and the slotting hole are filled with ordinary explosive tubes. The ordinary explosive tube includes a charging tube and explosives and electronic digital detonators installed in the charging tube.

[0019] (3) Blasting: The slotted hole, the auxiliary hole and the peripheral hole are detonated in sequence by the electronic digital detonator.

[0020] The present invention has the following beneficial effects:

[0021] 1. The delivery rod of the present invention can effectively adjust the direction of the shaped charge explosive tube, and after the direction is adjusted, it will not cause the direction of the explosive tube to change even if it is separated from the shaped charge explosive tube. In the end, the direction of the opening of the shaped charge slot corresponds to the set blasting direction, the blasting cut direction is accurate, and the blasting effect is well controlled.

[0022] 2. The delivery rod of this invention is scientifically designed with only four moving parts: an unlocking handle, a retraction handle, a limiting component, and a telescopic component. The adjustment housing has a small number of parts and a large gap in the structural distribution, which makes its internal space dispersed, thus reducing the likelihood of mechanical failure. Even if a failure occurs, simple on-site repair and troubleshooting can be performed. It has high reliability and is easy to operate. Users can get started without training, making it well-suited for construction site environments and improving the efficiency of explosive loading.

[0023] 3. In the process of shallow-hole blasting of foundation pits in complex environments with protected objects within a 200m range, the shaped charge explosive tubes of this invention, combined with the delivery rod, are used. During blasting, the directional shaped charge explosive tubes are filled in the holes around the foundation pit, which can form a jet penetration and rock-breaking effect along the centerline of the V-shaped groove. The shaped charge effect is used to form directional cracks, eliminating the need for simultaneous detonation of multiple holes or simultaneous detonation of the same row to form cracks. This minimizes the disturbance of the blast shock wave, effectively protecting adjacent objects and reducing the consumption of explosives per unit, thereby reducing blasting costs and improving economic efficiency. [Attached Image Description]

[0024] Figure 1This is a three-dimensional structural schematic diagram of a shaped charge delivery rod for shaped charge blasting according to the present invention.

[0025] Figure 2 This is a partially enlarged view of the adjustment head portion of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the adjustment head part of the present invention.

[0027] Figure 4 This is a schematic diagram of the structure of the limiting component of the present invention.

[0028] Figure 5 This is a schematic diagram of the structure of the telescopic component of the present invention.

[0029] Figure 6 This is a schematic diagram of the structure of the shaped charge explosive tube of the present invention.

[0030] Figure 7 This is a schematic diagram of the blast hole arrangement on the excavation face of the foundation pit according to the present invention.

[0031] Explanation of main component symbols

[0032] In the diagram, 1-adjusting rod, 2-control rod, 3-adjusting housing, 31-adjusting hole, 4-pin, 5-unlocking handle, 6-exit handle, 7-limiting component, 71-limiting cylinder, 72-limiting spring, 73-limiting rod, 8-telescopic component, 81-front end plate, 82-turntable, 83-rear end plate, 84-positioning handle, 85-positioning head, 86-retraction spring, 9-adjusting cable, 10-hanging rod, 100-shaped explosive tube, 101-V-groove, 102-sealing cap, 103-insertion interface, 104-peripheral hole, 105-auxiliary hole, 106-grooving hole.

[0033] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention.

Detailed Implementation Methods

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Reference Figure 1-5 In one embodiment of the present invention, a shaped charge delivery rod for explosive blasting includes a hollow adjusting rod 1 and a control rod 2. The control rod 2 is vertically connected to the rod body at the rear of the adjusting rod 1. Both the adjusting rod 1 and the control rod 2 are made of 304 stainless steel pipe, and the outer diameter, inner diameter and length of the adjusting rod 1 are 24mm, 22mm and 1000mm, respectively.

[0038] The front end of the adjusting rod 1 is connected to an adjusting head, which includes an adjusting housing 3 and a pin 4. Both the adjusting housing 3 and the pin 4 are made of stainless steel. The length of the adjusting housing 3 is 80mm, and it communicates with the interior of the adjusting rod 1. The adjusting housing 3 is provided with an adjusting assembly. A through hole (not shown in the figure) adapted to the pin 4 is opened in the middle of the front end face of the adjusting housing 3. The rear end of the pin 4 is connected to the adjusting assembly through the through hole, and the front end of the pin 4 is inserted into the rear end of the shaped charge tube 100. An operating handle is hinged to the control rod 2. The operating handle is connected to the adjusting assembly through an adjusting cable 9. When the operating handle is turned, the adjusting cable 9 tightens, causing the adjusting assembly to retract, so that the pin 4 retracts into the adjusting housing 3 and disengages from the shaped charge tube 100. By inserting the pin 4 into the shaped charge tube 100, the direction of the shaped charge tube 100 can be adjusted by rotating the delivery rod. During direction calibration, the pin 4 can be retracted directly along the length of the adjustment rod by using the operating handle in conjunction with the adjustment component, thereby stably disengaging from the shaped charge tube 100. This disengagement method does not cause the direction of the shaped charge tube 100 to change, ensuring the effectiveness of use.

[0039] The pin 4 has a trapezoidal cross-section. This trapezoidal structure ensures a more stable connection between the pin 4 and the shaped charge tube 100, preventing relative rotation between the pin and the shaped charge tube 100 when the delivery rod rotates, thus avoiding interference with the adjustment effect. Furthermore, to better determine the position of the shaped charge slot in the shaped charge tube 100, a marking line (not shown in the figure) is provided on the adjusting rod 1 corresponding to the position of the shaped charge slot in the shaped charge tube 100. This marking line allows for determination of whether the position of the shaped charge slot is consistent with the direction of the blasting cut.

[0040] The operating handles include an unlocking handle 5 and an exit handle 6, both made of stainless steel. They are hinged to the left and right sides of the control lever 2, respectively, and each handle has a different color marking for easy identification by the operator. The adjustment assembly includes a telescopic component 8 and a limiting component 7. The telescopic component 8 is connected to the pin 4 to control its extension and retraction, while the limiting component 7 limits the telescopic component 8. The exit handle 6 is connected to the telescopic component 8 via an adjustment cable 9, and the unlocking handle 5 is connected to the limiting component 7 via another adjustment cable 9. When the unlocking handle 5 is turned, the limiting component 7 retracts, releasing the locking of the telescopic component 8, allowing it to extend and retract under force. Then, turning the exit handle 6 causes the telescopic component 8 to retract, pulling the pin 4 back into the adjustment housing 3 and separating it from the shaped charge tube 100.

[0041] Specifically, the telescopic component 8 includes a connecting seat with a circular cross-section, also made of stainless steel. The front end of the connecting seat is connected to the pin 4. A locking handle 84 is vertically connected to each of the opposite sides of the middle of the connecting seat. An adjustment hole 31 is opened on each of the opposite sides of the adjusting housing 3 along its length. The free ends of the two locking handles 84 extend out of the adjusting housing 3 through the corresponding adjustment hole 31, and the ends of the locking handles 84 outside the adjusting housing 3 are connected to locking mechanisms. The head 85, the width of which is greater than the width of the adjusting hole 31, the locking handle 84 and the locking head 85 are both made of stainless steel, the rear end face of the connecting seat is connected to a return spring 86, a hanging rod 10 is vertically connected between the inner walls of the two opposite sides of the front end of the adjusting rod 1, the rear end of the return spring 86 is connected to the hanging rod 10, an adjusting pull wire 9 passes through the hanging rod 10 and splits into two branches, which are respectively connected to the middle of the two locking handles 84. When the return spring 86 is in its natural state, the... The pin 4 extends out of the adjusting housing 3; the limiting member 7 consists of two sets, which are symmetrically arranged on opposite sides of the inner wall of the adjusting housing 3. Each limiting member 7 includes a limiting cylinder 71, a limiting spring 72, and a limiting rod 73. The limiting cylinder 71 is located on the inner wall of the adjusting housing 3, with its lower end closed and its upper end open. The limiting spring 72 is located inside the limiting cylinder 71, and its lower end is connected to the bottom surface of the limiting cylinder 71. The upper end of the limiting spring 72 is connected to the lower end of the limiting rod 73. The limiting rod 73 is adapted to the limiting cylinder 71. The other adjusting pull line 9 passes through the hanging rod 10 and splits into two branches. The two branches pass through the bottom of the limiting cylinder 7 and the limiting spring 72 on the corresponding side and are connected to the lower end of the limiting rod 73. When the limiting spring 72 is in its natural state, the limiting rod 73 fixes the locking handle 84 at the uppermost end of the adjusting hole 31. At this time, the pin 4 is stably located outside the adjusting housing 3, and the telescopic member 8 is not retractable under force.

[0042] In a preferred embodiment, the adjustment hole 31 is shaped like a "7", with its upper horizontal portion slightly inclined upwards, and the upper horizontal portions of the two adjustment holes 31 facing opposite directions. When the limiting member 7 is in the limiting position, the limiting rod 73 blocks the uppermost end of the upper horizontal portion of the adjustment hole 31, resulting in a simple and stable limiting structure. Meanwhile, to be compatible with the adjustment hole 31, the connecting seat includes a front end plate 81, a rear end plate 83, and a turntable 82 disposed between the front end plate 81 and the rear end plate 83. The turntable 82 is connected to the locking handle 84, and when the locking handle 84 is under force, the locking handle 84, together with the turntable 82, can rotate relative to the front end plate 81 and the rear end plate 83. The rotatable locking handle 84 can only slide smoothly backwards along the adjustment hole 31 after the limiting position is removed, thereby separating the pin 4 from the shaped charge tube 100.

[0043] The delivery rod of this invention is made primarily of 304 stainless steel, which effectively prevents rust and mechanical failure caused by corrosion in humid environments, while also ensuring the structural strength of the delivery rod. Its working principle is as follows: the telescopic component 8, combined with the release handle 6, provides the power to pull out the pin 4. The limiting component 7 restricts the telescopic component 8 during adjustment, preventing premature retraction due to accidental contact. After adjustment, the telescopic component 8 is unlocked by first moving the unlocking handle 5, and then the pin 4 is retracted and disengaged from the shaped charge tube 100 by moving the release handle 6. After the pin 4 is disengaged, the release handle 6 and the unlocking handle 5 are released sequentially to restore the pin to its position outside the adjusting housing 4, ready for loading into the next borehole.

[0044] Referring again to 6, in Embodiment 2 of the present invention, a blasting assembly is also provided. The blasting assembly includes the aforementioned feed rod and a shaped charge explosive tube 100. The shaped charge slot of the shaped charge explosive tube 100 is a V-shaped slot 101. The shaped charge explosive tube 100 is filled with explosive and has an electronic digital detonator at its front end. The end face of the rear sealing cap 102 of the shaped charge explosive tube 100 has an insertion interface 103 adapted to the pin 4. The shaped charge explosive tube 100 is connected to the feed rod through the insertion interface 103 and the pin 4. This blasting assembly adjusts the orientation of the shaped charge explosive tube 100 in the borehole through the feed rod, ensuring that the direction of the shaped charge slot matches the direction of the blasting cut, thus guaranteeing the blasting effect.

[0045] Continue reading Figure 7 The present invention also provides an application of a blasting component in shallow hole blasting of foundation pits in complex environments, comprising the following steps:

[0046] (1) Preparation: Complete the blasting design according to the specific foundation pit excavation situation, and determine the delay parameters of the electronic digital detonator used in each blast hole (generally 10ms-30ms, that is, the blasting interval between two adjacent blast holes is 10ms-30ms) and the specifications of the explosive tube.

[0047] (2) Opening holes: A ring of peripheral holes 104 are evenly opened on the outline of the excavated foundation pit, a ring of slotting holes 106 are evenly opened in the middle of the excavated foundation pit surface, and a ring of auxiliary holes 105 are evenly opened between the peripheral holes 104 and the slotting holes 106, and the lines connecting the peripheral holes 104, the slotting holes 106 and the auxiliary holes 105 are parallel to each other.

[0048] (3) Loading: The shaped charge explosive tube 100 is loaded into the peripheral hole 104, and the feeding rod is used to adjust so that the opening direction of the V-groove 101 is facing the same side of the excavation pit outline. The auxiliary hole 105 and the slotting hole 106 are filled with ordinary explosive tubes. The ordinary explosive tube includes a loading tube and explosives and electronic digital detonators installed in the loading tube.

[0049] The specific steps for adjusting the shaped charge tube using the delivery rod are as follows:

[0050] S1. Preparation: On-site workers assemble and prepare the shaped charge explosive tubes required for shallow hole controlled blasting of the foundation pit according to the construction needs.

[0051] S2, Inserting and feeding explosive: After inserting the front end of the shaped charge explosive tube 100 into the borehole, hold the adjusting rod 1 in the feeding rod with one hand, and use the other hand to fully and stably insert the rear end insertion interface 103 of the shaped charge explosive tube 100 into the pin 4, and then push the shaped charge explosive tube 100 into the correct fixed position in the borehole.

[0052] S3. Adjustment: The worker checks the blast hole parameters on the construction drawing and rotates the feed rod according to the blast hole parameters so that the marking line on the adjusting rod 1 is consistent with the blasting direction.

[0053] S5. Separation: First, pull the unlocking handle 5, then pull the exit handle 6 to disengage the pin 4 from the shaped charge tube 100, then remove the delivery rod from the borehole and fill the borehole.

[0054] S6. Reset: Release the exit handle 6 and the unlock handle 5 in sequence, and the pin 4 will reset. At this time, the next shaped charge explosive tube 100 can be connected for adjustment.

[0055] (4) Blasting: The slotted hole 106, the auxiliary hole 105 and the peripheral hole 104 are detonated in sequence by the electronic digital detonator. The specific detonation methods are all existing technologies and have been mastered by those skilled in the art. To save space, the present invention will not be described in detail here.

[0056] When the peripheral holes 104 are detonated using the above-mentioned blasting method, a jet penetration and rock-breaking effect can be formed along the centerline of the V-shaped groove, thereby forming directional cracks. This eliminates the need for simultaneous detonation of multiple holes or simultaneous detonation of the same row to form cracks, thus minimizing the disturbance of the blasting shock wave. This not only effectively protects adjacent objects but also reduces the consumption of explosives, thereby reducing blasting costs and improving economic efficiency.

[0057] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A charging rod for shaped charge blasting, characterized in that: The device includes a hollow adjusting rod and a control rod, with the control rod perpendicularly connected to the rear section of the adjusting rod. An adjusting head is connected to the front end of the adjusting rod, and the adjusting head includes an adjusting housing and a pin. The adjusting housing communicates with the adjusting rod and has an adjusting assembly. A through hole adapted to the pin is formed in the center of the front face of the adjusting housing, and the rear end of the pin is connected to the adjusting assembly through the through hole. The front end of the pin is inserted into the rear end of a shaped charge tube. An operating handle is hinged to the control rod, and the operating handle is connected to the adjusting assembly via an adjusting cable. When the operating handle is moved, the adjusting cable tightens, causing the adjusting assembly to retract, thus retracting the pin to the desired position. The adjustment assembly is separated from the shaped charge tube within the housing. The adjustment assembly includes a telescopic member and a limiting member. The telescopic member is connected to the pin to control the extension and retraction of the pin, and the limiting member is used to limit the telescopic member. The operating handle includes an unlocking handle and a retraction handle, which are respectively hinged to the left and right sides of the control rod. The retraction handle is connected to the telescopic member via an adjustment cable, and the unlocking handle is connected to the limiting member via another adjustment cable. When the unlocking handle is moved, the limiting member retracts and releases the limiting of the telescopic member. When the retraction handle is moved, the telescopic member retracts, causing the pin to retract back into the adjustment housing.

2. The delivery rod for shaped charge blasting according to claim 1, characterized in that: The telescopic component includes a connecting seat, the front end of which is connected to the pin. A locking handle is vertically connected to each of the opposite sides of the middle portion of the connecting seat. An adjustment hole is formed along the length of each of the opposite sides of the adjusting housing. The free ends of the two locking handles extend out of the adjusting housing through the corresponding adjustment hole. A return spring is connected to the rear end of the connecting seat. A hanging rod is vertically connected between the inner walls of the opposite sides of the front end of the adjusting rod. The rear end of the return spring is connected to the hanging rod. An adjusting cable passes through the hanging rod and splits into two branches, each connected to the middle of one of the two locking handles. When the return spring is in its natural state... The pin extends out of the adjusting housing; the limiting component includes a limiting cylinder, a limiting spring, and a limiting rod. The limiting cylinder is located on the inner wall of the adjusting housing, with its lower end closed and its upper end open. The limiting spring is located inside the limiting cylinder, with its lower end connected to the bottom surface of the limiting cylinder. The upper end of the limiting spring is connected to the lower end of the limiting rod. Another adjusting pull line passes through the hanging rod and splits into two branches. The two branches pass through the bottom of the limiting cylinder and the limiting spring on the corresponding side, respectively, and then connect to the lower end of the limiting rod. When the limiting spring is in its natural state, the limiting rod fixes the locking handle at the uppermost end of the adjusting hole.

3. The charging rod for shaped charge blasting according to claim 2, characterized in that: The adjustment hole is shaped like the number 7, and the upper parts of the two adjustment holes face opposite directions laterally.

4. The charging rod for shaped charge blasting according to claim 3, characterized in that: The connecting seat includes a front plate, a rear plate, and a turntable disposed between the front plate and the rear plate. The turntable is connected to the locking handle, and when the locking handle is subjected to force, the locking handle together with the turntable can rotate relative to the front plate and the rear plate.

5. The charging rod for shaped charge blasting according to claim 2, characterized in that: The unlock handle and the exit handle are marked with different colors.

6. The charging rod for shaped charge blasting according to claim 1, characterized in that: The adjusting rod is marked with a line corresponding to the position of the shaped charge slot of the shaped charge explosive tube.

7. The charging rod for shaped charge blasting according to claim 1, characterized in that: The cross-section of the pin is trapezoidal.

8. A blasting assembly, characterized in that: it comprises a delivery rod as described in any one of claims 1-7 and a shaped charge explosive tube, wherein the shaped charge slot of the shaped charge explosive tube is a V-shaped slot, the shaped charge explosive tube is filled with explosive and has an electronic digital detonator at its front end, and the end face of the closed cap at the rear end of the shaped charge explosive tube has an insertion interface adapted to the pin, and the shaped charge explosive tube is connected to the delivery rod by insertion through the insertion interface and the pin.

9. The application of the blasting assembly as described in claim 8 in shallow hole blasting of foundation pits in complex environments, characterized in that, Includes the following steps: (1) Opening holes: A ring of peripheral holes is evenly opened on the outline of the excavated foundation pit, a ring of slotting holes is evenly opened in the middle of the excavated foundation pit surface, and a ring of auxiliary holes is evenly opened between the peripheral holes and the slotting holes, and the lines connecting the peripheral holes, the slotting holes and the auxiliary holes are parallel to each other. (2) Loading: The shaped charge explosive tube is loaded into the peripheral hole, and the feeding rod is used to adjust so that the opening direction of the V-shaped groove is facing the same side of the excavation pit outline. The auxiliary hole and the slotting hole are filled with ordinary explosive tubes. The ordinary explosive tube includes a loading tube and explosives and electronic digital detonators installed in the loading tube. (3) Blasting: The slotted hole, the auxiliary hole and the peripheral hole are detonated in sequence by the electronic digital detonator.

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