Connecting device of detonating cord and detonator, pushing device and pushing method

Abstract

The present application relates to the technical field of blasting, and discloses a connecting device of detonating cord and detonator, a pushing device and a pushing method. The connecting device comprises a connecting device body and a limiting part. The connecting device body has a containing cavity, and a side wall is provided with an opening communicating with the containing cavity. The connecting device body is sleeved on the detonating cord through the opening and can slide along the detonating cord. The limiting part is arranged at the front end of the connecting device body. The front end of the detonator abuts against the limiting part after being loaded into the containing cavity. The detonating cord and the detonator are jointly clamped in the containing cavity and cannot fall off from the opening. The pushing device comprises a pushing guide rod, and the front end of the pushing guide rod is provided with a crescent-shaped pushing head with a crescent groove. The pushing method comprises the following steps: sleeving the connecting device body on the detonating cord, loading the detonator, and pushing the connecting device body and the detonator to a predetermined position along the detonating cord through the crescent-shaped pushing head. The present application realizes that the detonator freely slides along the detonating cord to a predetermined detonation position in the hole, avoids the risk of bending the detonating cord, and improves the blasting safety.

Description

Technical Field

[0001] This invention relates to the field of blasting technology, specifically to a connection device, pushing device, and pushing method for a detonating cord and a detonator. Background Technology

[0002] In underground coal mine depressurization blasting and various engineering blasting operations, detonating cords are typically used in conjunction with detonators to ignite explosives. The detonating cord, as a linear incendiary device that transmits the detonation wave, needs to be detonated by the detonator to propagate the detonation wave along its axis, ultimately igniting the explosive in the blast hole. Currently, there are two main methods for connecting the detonating cord and the detonator: one is to use tape to wrap and fix the detonator and detonating cord side-by-side; the other is to use detonator lead wire wrapped around the detonating cord to fix itself. However, both of these connection methods share a common drawback—once the detonator and detonating cord are connected, they are locked and cannot be moved or adjusted relative to each other along the detonating cord. More seriously, because the detonator is fixed to the detonating cord, during the process of inserting the connected detonating cord and detonator into the blast hole, if it encounters resistance from the hole wall or a bend in the duct, the fixed detonator cannot slide along the detonating cord to adaptively adjust its posture. This forces the detonating cord to bend at a sharp angle at the fixing point, directly affecting the normal transmission of the detonation wave along the detonating cord, and in severe cases, even causing a misfire.

[0003] To address the aforementioned issues, relevant technologies have proposed improvement solutions. For example, Anhui University of Science and Technology's invention patent application (CN108662957A) filed in 2018 discloses a detonating cord / detonating wire connection device, including a detonating cord / detonating wire slot, a detonating wire slot, a sealing slot, and a sealing post. The detonating cord / detonating wire slot and the detonating wire slot are tangent. After the detonator is inserted into the detonator slot and the detonating wire is inserted into the detonating wire slot, the sealing post is inserted into the sealing slot to compact and fix it. This solution achieves a fixed connection between the detonator and the detonating wire without the need for adhesive tape. However, this device still has the following shortcomings: First, after the detonator and detonating cord are installed into their respective slots and secured by sealing posts, they are locked in place, preventing the detonator from moving or adjusting its position along the detonating cord's axis. There is still a risk of the detonating cord bending when the entire device is inserted into the borehole. Second, the device consists of multiple independent components, including detonating cord slots, detonating cord slots, sealing slots, and sealing posts, resulting in a complex structure and cumbersome on-site operation. Third, the slot diameter is designed to be "slightly larger" than the diameters of the detonator and detonating cord, meaning one specification can only accommodate detonators and detonating cords of specific diameters, lacking versatility. Fourth, the device can only be inserted into the borehole after connection is completed outside the borehole; it cannot be used to retrofit and push the detonator to the predetermined detonation position inside the borehole if the detonating cord has already been pre-embedded in the borehole. Furthermore, none of the existing solutions address the protection of the detonator lead wire during the pushing process.

[0004] In engineering blasting, the position of the detonator within the borehole has a significant impact on the blast effect. The position of the detonator determines the distribution of explosive energy along the axial direction of the borehole. According to blasting operation procedures, the detonating charge should be placed at a predetermined position along the entire length of the charge, and the detonator's shaped charge cavity should point in the direction of detonation propagation. If the detonator is only connected at the borehole opening, it is highly susceptible to ignition and explosion when encountering flammable and explosive gases such as methane at the mining site, and detonation at the borehole opening can easily generate safety hazards such as flying rocks. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a connection device, a pushing device, and a pushing method for detonating cord and detonator. It has advantages such as the detonator being able to slide freely along the detonating cord and its position being adjustable, thus solving the problem in existing technologies where the detonator cannot be moved to the predetermined detonation position inside the hole after being fixedly connected to the detonating cord.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: The first aspect of the present invention provides a connection device for a detonating cord and a detonator, comprising: The connecting device body has a receiving cavity for accommodating detonating cord and detonator. The side wall of the connecting device body has an opening communicating with the receiving cavity. The connecting device body is sleeved on the detonating cord through the opening and can slide along the detonating cord. The rear end of the connecting device body is for the detonator to be inserted into the receiving cavity. A limiting part is provided at the front end of the connecting device body, and after the detonator is inserted into the receiving cavity, its front end abuts against the limiting part; After the detonator is inserted into the receiving cavity, the detonating cord and the detonator are locked together in the receiving cavity, and the detonator and the detonating cord cannot fall out of the opening.

[0007] The opening extends through the body of the connecting device along its axial direction.

[0008] The connecting device body is an elliptical tubular structure, and the opening is located at the top end of the elliptical tubular structure along its minor axis.

[0009] The limiting part is a baffle plate fixedly installed on one side wall of the receiving cavity, and the baffle plate is made of the same material as the body of the connecting device.

[0010] The connecting device body is made of an anti-static, insulating, non-metallic elastic material, preferably flame-retardant ABS engineering plastic.

[0011] A second aspect of the present invention provides a pushing device for pushing the connecting device of the first aspect above, thereby driving the internal detonator to a predetermined detonation location, including a pushing guide rod, the front end of which is provided with a crescent-shaped push head; The crescent-shaped pusher has a crescent groove that is adapted to the outer wall of the detonating cord. The crescent-shaped pusher engages with the detonating cord through the crescent groove and can slide along the detonating cord. The front end of the crescent-shaped pusher is used to abut against the front end of the connecting device body and the limiting part to push the connecting device body along the detonating cord; the length of the pusher rod is adjustable.

[0012] A third aspect of the present invention provides a method for pushing a detonating cord and a detonator, using the pushing device described in the second aspect to move the connecting device, comprising the following steps: S1: The connecting device body is fitted onto the detonating cord through the opening in its side wall; S2: Insert the detonator into the receiving cavity from the rear end of the connecting device body, so that the front end of the detonator abuts against the limiting part at the front end of the connecting device body, and the detonating cord and the detonator are locked together in the receiving cavity. S3: Adjust the length of the push guide rod according to the predetermined position; S4: The crescent-shaped pusher of the pusher rod is engaged with the detonating cord through the crescent groove, so that the front end of the crescent-shaped pusher abuts against the front end of the connecting device body and the limiting part, and pushes the connecting device body along the axial direction of the detonating cord, so that the connecting device body and the detonator slide together to the predetermined position.

[0013] The process of inserting the detonator into the receiving cavity also includes the step of straightening the detonator leads.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a connection device, a pushing device, and a pushing method for connecting detonating cord and detonator, which has the following beneficial effects: The detonating cord and detonator connection device, pushing device, and pushing method, through which the connecting device body is sleeved on the detonating cord and can slide along the detonating cord, allows the detonator to be freely adjusted to the predetermined detonation position inside the hole, overcoming the defect of existing technologies where the detonator cannot be moved after being fixedly connected to the detonating cord; by pushing along the detonating cord with the crescent-shaped pusher head of the pushing guide rod, the detonator can be installed after the detonating cord is pre-embedded and pushed into the hole, solving the limitation of existing devices that can only be inserted as a whole from outside the hole; during the pushing process, the connecting device can adaptively adjust its posture with the natural direction of the detonating cord, avoiding the risk of the detonating cord bending; the detonator does not contact the hole wall during the installation and pushing process at the hole opening, effectively protecting the detonator and lead wire, and improving blasting safety; at the same time, pushing the detonator to the predetermined detonation position inside the hole improves the blasting effect and explosive utilization rate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the combined structure of the connecting device and the pushing device of the present invention in use; Figure 2 This is a schematic diagram of the structure of the connecting device combined with the detonating cord and detonator in this invention; Figure 3 This is a schematic diagram of the pushing device in this invention; Figure 4 This is a flowchart of the method of the present invention; In the figure: 100, connecting device body; 101, receiving cavity; 102, opening; 200, limiting part; 300, push guide rod; 301, push head; 302, crescent groove. Detailed Implementation

[0016] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] Example 1 Please see Figure 1-2 The first aspect of the present invention provides a connection device for a detonating cord and a detonator, comprising: The connecting device body 100 has a receiving cavity 101 for accommodating detonating cord and detonator. The connecting device body 100 has a tubular structure with an elliptical cross-section. The receiving cavity 101 extends along the axial direction of the connecting device body 100. An opening 102 communicating with the receiving cavity 101 is formed in the side wall of the connecting device body 100. The opening 102 is located at the top end of the elliptical tubular structure along its minor axis and extends through the connecting device body 100 along its axial direction. The connecting device body 100 is fitted onto the detonating cord through the opening 102 and can slide along the detonating cord. Specifically, after aligning the opening 102 of the connecting device body 100 with the detonating cord, it is pressed radially so that the detonating cord enters the receiving cavity 101 through the opening 102. The original width of the opening 102 is slightly smaller than the outer diameter of the detonating cord. After being fitted, the connecting device body 100 is held by the elastic restoring force of its material to the outer circumference of the detonating cord, preventing it from falling off on its own and allowing it to slide smoothly along the detonating cord when subjected to axial thrust. The rear end of the connecting device body 100 is for inserting a detonator into the receiving cavity 101. After the detonator is inserted, a locking mechanism is formed between the detonator and the detonating cord on the left and right sides of the receiving cavity 101, making it difficult for the connecting device body 100 to detach from the opening 102, but without hindering the sliding of the connecting device body 100 along the detonating cord.

[0020] A limiting part 200 is disposed at the front end of the connecting device body 100. After the detonator is inserted into the receiving cavity 101, its front end abuts against the limiting part 200. The limiting part 200 is a baffle fixedly disposed on the inner wall of the front end of the connecting device body 100. The baffle only covers a part of the cross-section of the receiving cavity 101. The detonating cord can pass through the side of the baffle, while the front end of the detonator is in contact with the rear end of the baffle, thereby limiting the insertion position of the detonator.

[0021] After the detonator is inserted into the receiving cavity 101, the detonating cord and the detonator are locked together within the receiving cavity 101, and neither the detonator nor the detonating cord can detach from the opening 102. Specifically, the detonating cord and the detonator are arranged side by side laterally within the receiving cavity 101, and their mutual compression causes a slight elastic deformation of the connecting device body 100, thereby fixing the connecting device body 100, the detonating cord, and the detonator relatively in place. Since the detonating cord occupies the space at the opening 102, the detonator cannot detach from the opening 102.

[0022] Furthermore, the connecting device body 100 has an elliptical tubular structure, and the opening 102 is located at the top end of the elliptical tubular structure along its minor axis. The inner diameter of the elliptical tubular structure along its minor axis is slightly smaller than its inner diameter along its major axis, allowing the detonating cord and detonator to be close to each other and generate moderate compression when arranged side by side in the receiving cavity 101, which is beneficial to improving the stability of the snap-fit.

[0023] Furthermore, the limiting part 200 is a baffle plate fixedly disposed on one side wall of the receiving cavity 101, and the baffle plate is made of the same material as the connecting device body 100. The size of the baffle plate should ensure that it does not affect the movement of the detonating cord while providing axial limiting of the front end of the detonator. The rear end face of the baffle plate serves as the axial limiting surface when the detonator is inserted.

[0024] Furthermore, the connecting device body 100 is made of an antistatic, insulating, non-metallic elastic material, preferably flame-retardant ABS engineering plastic. Using this material allows the connecting device body 100 to possess elastic deformation capability, insulating and antistatic properties, and sufficient structural strength, enabling safe use in underground coal mine environments. Simultaneously, the material's elasticity allows for the insertion and holding of the detonating cord and the snap-fit ​​fixing of the detonator without the need for additional locking components. In addition, the connecting device body 100 and the baffle can also be made of other antistatic, insulating, elastic materials that meet the safety requirements for non-metallic products in underground coal mines, such as flame-retardant and antistatic modified nylon (PA).

[0025] Example 2 Please see Figure 3 The second aspect of the present invention provides a pushing device for pushing the connecting device of the first aspect, thereby driving the internal detonator to a predetermined detonation location, including a pushing guide rod 300, the pushing guide rod 300 being a slender rod-shaped structure, the length of which can be adjusted according to the depth of the borehole and the predetermined detonation position, and a handle can be further provided at the rear end of the pushing guide rod 300 for the operator to hold and apply pushing force.

[0026] The front end of the push guide rod 300 is provided with a crescent-shaped push head 301; the cross-section of the crescent-shaped push head 301 is crescent-shaped, and its front end face is flat, which is used to abut against the front end face of the connecting device body 100 and the limiting part 200.

[0027] The crescent-shaped pusher 301 has a crescent groove 302 that is adapted to the outer wall of the detonating cord. The crescent-shaped pusher 301 cooperates with the detonating cord through the crescent groove 302 and can slide along the detonating cord. The inner arc surface of the crescent groove 302 fits against the outer wall of the detonating cord. When the pusher rod 300 slides along the axial direction of the detonating cord, the crescent groove 302 always keeps in contact with the detonating cord to ensure the stability of the pushing direction.

[0028] In other embodiments, the inner arc surface of the crescent groove 302 is provided with a sliding pad made of a low coefficient of friction material to reduce friction during pushing.

[0029] The front end of the crescent-shaped pusher 301 is used to abut against the front end of the connecting device body 100 and the limiting part 200 to push the connecting device body 100 along the detonating cord. Specifically, when pushing, the operator holds the handle at the rear end of the pusher rod 300 and slides the crescent-shaped pusher 301 along the detonating cord toward the hole until the front end of the crescent-shaped pusher 301 abuts against the front end of the limiting part 200. Continuing to apply the pushing force will push the entire connecting device body 100 to slide along the detonating cord toward the hole.

[0030] The length of the push guide rod 300 is adjustable. Preferably, the push guide rod 300 is a telescopic rod structure, composed of multiple interlocking rod segments, with adjacent segments fixed by locking devices to achieve stepless or stepped adjustment of the length. In other embodiments, the push guide rod 300 may also be composed of multiple detachably connected rod segments, with the appropriate number of segments selected for assembly according to the required length.

[0031] Example 3 Please see Figure 4 The third aspect of the present invention provides a method for pushing a detonating cord and a detonator, using the pushing device of the second aspect described above to move the connecting device, comprising the following steps: S1: The connecting device body 100 is fitted onto the detonating cord through the opening 102 on its side wall; specifically, firstly, a blast hole is drilled in the blast body, the explosive and the detonating cord are loaded into the bottom of the blast hole, and the end of the detonating cord extends outward from the blast hole opening by a predetermined length. Then, outside the hole opening, the opening 102 of the connecting device body 100 is aligned with the extended section of the detonating cord, and the connecting device body 100 is fitted onto the detonating cord radially. The connecting device body 100 is held on the outer periphery of the detonating cord by elastic restoring force, and remains in the current position when no external force is applied. At the same time, it can slide smoothly along the detonating cord under the push of external force.

[0032] S2: Insert the detonator into the receiving cavity 101 from the rear end of the connecting device body 100, so that the front end of the detonator abuts against the limiting part 200 at the front end of the connecting device body 100. The detonating cord and the detonator are together engaged in the receiving cavity 101. Specifically, insert the detonator into the receiving cavity 101 from the rear end of the connecting device body 100 and push it forward axially until the front end face of the detonator abuts against the rear end face of the limiting part 200. At this point, the detonator has reached the predetermined installation position in the receiving cavity 101. The detonating cord and the detonator are arranged side by side laterally in the receiving cavity 101. The mutual compression between the two causes the connecting device body 100 to undergo elastic deformation, thereby fixing the three relatively. After inserting the detonator, straighten and align the detonator lead along the extension direction of the detonating cord to ensure that the lead does not become tangled or snagged during subsequent pushing.

[0033] S3: Adjust the length of the push guide rod 300 according to the predetermined position; specifically, calculate the pushing distance according to the borehole depth and the detonation position required by the design, and adjust the length of the push guide rod 300 accordingly so that the length of the push guide rod 300 is adapted to the pushing distance, ensuring that the push guide rod 300 can push the connecting device to the predetermined detonation position required by the design.

[0034] S4: The crescent-shaped pusher 301 of the pusher rod 300 is engaged with the detonating cord through the crescent groove 302, so that the front end of the crescent-shaped pusher 301 abuts against the front end of the connecting device body 100 and the limiting part 200, and pushes the connecting device body 100 along the axial direction of the detonating cord, so that the connecting device body 100 and the detonator slide together to the predetermined position. Specifically, the operator holds the handle at the rear end of the push rod 300, and places the crescent-shaped groove 302 of the crescent-shaped pusher 301 against the outer wall of the detonating cord. The operator slides the push rod 300 along the detonating cord towards the hole, causing the front face of the crescent-shaped pusher 301 to abut against the front faces of the connecting device body 100 and the limiting part 200. Axial thrust is then applied, and the crescent-shaped pusher 301, through the limiting part 200, pushes the connecting device body 100 to slide along the detonating cord towards the hole. The detonator inside the connecting device body 100 moves along with it until the predetermined detonation position is reached. During the pushing process, the connecting device body 100 and the detonating cord are in a sliding engagement, allowing the device to adaptively adjust its posture according to the natural direction of the detonating cord without forcing it to bend at an acute angle. After pushing is complete, the push rod 300 is removed from the detonating cord, and subsequent detonation operations can then proceed.

[0035] Furthermore, after the detonator is inserted into the receiving cavity 101, the procedure also includes straightening the detonator leads. The specific lead-straightening steps include: the operator first confirms that the detonator leads have not twisted or crossed after being led out from the rear end of the detonator; then, the leads are naturally extended along the direction of the detonating cord, ensuring they are parallel to and alongside the detonating cord, preventing the leads from getting tangled in the cord; and the operator gently runs their fingers along the length of the leads from the rear end of the detonator to the end of the leads, ensuring the leads are straight, without folds, twists, or knots.

[0036] After the lead wire is organized, it can be fixed to the push guide rod 300 with tape, so that the lead wire moves synchronously with the push guide rod 300 during the push process. When applying the tape, the lead wire should be in a natural straight state. After application, the lead wire should still have an appropriate degree of slack to prevent the detonator from shifting due to tension during the push process. Alternatively, an elastic clamping device can be set on the push guide rod 300. After the lead wire is straightened, it can be inserted into the clamping port of the elastic clamping device. The clamping force will temporarily fix the lead wire to the push guide rod 300. After the push is completed, the lead wire can be removed from the clamping port. This method does not consume tape and can be reused.

[0037] Compared to traditional methods of fixing with tape or lead wire, the connecting device 100 of this invention is fitted onto the detonating cord through an opening 102 and can slide freely along the detonating cord. After the detonator is inserted, it can be flexibly adjusted to the predetermined detonation position inside the hole according to the blasting design, solving the problem that the detonator cannot be moved once fixed in the traditional method. At the same time, since the connecting device 100 and the detonating cord are slidably fitted together, the pushing force is smoothly transmitted along the axis of the detonating cord, and there is no torque that forces the detonating cord to bend due to the fixed connection. This avoids the problem in the traditional method where the detonating cord is forced to bend at an acute angle when the detonator is fixed on the detonating cord and pushed as a whole, which affects the normal transmission of the detonation wave or even causes a misfire. In addition, this invention can realize the dual functions of detonating cord fitting and detonator housing with a single connecting device body 100. The structure is simple and does not require auxiliary fixing parts such as tape, lead wire, or sealing pins, making it easy to operate. The detonator is inserted and pushed outside the hole without contacting the hole wall, effectively protecting the detonator and lead wire and improving the safety of blasting operations.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection device for detonating cord and detonator, characterized in that, include: The connecting device body has a receiving cavity for accommodating detonating cord and detonator. The side wall of the connecting device body has an opening communicating with the receiving cavity. The connecting device body is sleeved on the detonating cord through the opening and can slide along the detonating cord. The rear end of the connecting device body is for the detonator to be inserted into the receiving cavity. A limiting part is provided at the front end of the connecting device body, and after the detonator is inserted into the receiving cavity, its front end abuts against the limiting part; After the detonator is inserted into the receiving cavity, the detonating cord and the detonator are locked together in the receiving cavity, and the detonator and the detonating cord cannot fall out of the opening.

2. The connecting device according to claim 1, characterized in that, The opening is provided to extend through the body of the connecting device along its axial direction.

3. The connecting device according to claim 1, characterized in that, The connecting device body is an elliptical tubular structure, and the opening is located at the top end of the elliptical tubular structure along its minor axis.

4. The connecting device according to claim 1, characterized in that, The limiting part is a baffle plate fixedly installed on one side wall of the receiving cavity, and the baffle plate is made of the same material as the body of the connecting device.

5. The connecting device according to claim 4, characterized in that, The main body of the connecting device is made of an anti-static, insulating, non-metallic elastic material, preferably flame-retardant ABS engineering plastic.

6. A pushing device for actuating the connecting device according to any one of claims 1 to 5, characterized in that, Includes a push guide rod, the front end of which is provided with a crescent-shaped push head; The crescent-shaped pusher has a crescent groove that is adapted to the outer wall of the detonating cord. The crescent-shaped pusher engages with the detonating cord through the crescent groove and can slide along the detonating cord. The front end of the crescent-shaped pusher is used to abut against the front end of the connecting device body and the limiting part to push the connecting device body along the detonating cord; the length of the pusher rod is adjustable.

7. A method for pushing detonating cord and detonator, using the pushing device described in claim 6, characterized in that, Includes the following steps: S1: The connecting device body is fitted onto the detonating cord through the opening in its side wall; S2: Insert the detonator into the receiving cavity from the rear end of the connecting device body, so that the front end of the detonator abuts against the limiting part at the front end of the connecting device body, and the detonating cord and the detonator are locked together in the receiving cavity. S3: Adjust the length of the push guide rod according to the predetermined position; S4: The crescent-shaped pusher of the pusher rod is engaged with the detonating cord through the crescent groove, so that the front end of the crescent-shaped pusher abuts against the front end of the connecting device body and the limiting part, and pushes the connecting device body along the axial direction of the detonating cord, so that the connecting device body and the detonator slide together to the predetermined position.

8. The push method according to claim 7, characterized in that, After the detonator is inserted into the receiving cavity, the process also includes straightening the detonator leads.

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