Injection mold for injection plug of leg wire of electronic detonator
By designing positioning pins, positioning columns, and support blocks, the problem of difficult positioning of inner and outer conductive springs in existing molds has been solved, enabling high-precision injection molding of electronic detonator leads, improving the versatility of the mold and reducing costs.
Patent Information
- Application Number
- CN202520403703.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Existing injection molds are unable to accurately position the inner and outer conductive springs, resulting in poor precision in electronic detonator lead wire products.
The design employs a positioning pin and positioning post structure. The first and second positioning posts at the front end of the positioning pin are used to position the inner and outer conductive springs respectively, ensuring coaxiality. Combined with the design of the support block and spring, this enables reliable assembly and convenient disassembly of the mold.
This ensures the coaxiality of the inner and outer conductive springs, improves the product precision of electronic detonator leads, enhances the versatility of molds, and reduces development costs.
Smart Images
Figure CN223777691U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and more specifically, to an injection mold for an electronic detonator lead wire injection plug. Background Technology
[0002] In the production process of electronic detonator lead wires, injection plugs need to be formed by injection molding on the outside of the inner conductive spring, the outside of the outer conductive spring, and the outside of the connection between the wire harness and the inner and outer conductive springs. Currently, the injection molds used for injection molding electronic detonator lead wire plugs on the market are difficult to position the inner and outer conductive springs, thus making it difficult to guarantee the coaxiality of the inner and outer conductive springs, resulting in poor precision of the electronic detonator lead wire products. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an injection mold for an electronic detonator lead plug, which can ensure the coaxiality of the inner and outer conductive springs after the electronic detonator lead plug is formed by injection molding, that is, can ensure the product precision of the electronic detonator lead.
[0004] This utility model provides an injection mold for an electronic detonator lead plug, including a lower mold and an upper mold detachably connected to the lower mold; at least one injection area is formed between the upper mold and the lower mold, and each injection area is provided with a plurality of cavities spaced apart from left to right; the upper mold is provided with injection gates corresponding to and communicating with the plurality of cavities; a support block is vertically fitted into the top of the rear side of the lower mold, and a positioning pin corresponding to the plurality of cavities is fixed on the front side of the support block; each positioning pin is inserted into the cavity at the corresponding position from back to front, and the front of each positioning pin... Each end is coaxially provided with a first positioning post whose outer diameter is smaller than that of the positioning pin. The front end of each first positioning post is coaxially provided with a second positioning post whose outer diameter is smaller than that of the first positioning post. The second positioning post is used to cooperate with the inner conductive spring in the electronic detonator lead wire to achieve the positioning of the inner conductive spring. The first positioning post is used to cooperate with the outer conductive spring in the electronic detonator lead wire to achieve the positioning of the outer conductive spring. When the plastic raw material is injected into the cavity through the injection gate, the plastic raw material located in the cavity is solidified with the inner conductive spring and the outer conductive spring to form the electronic detonator lead wire injection plug.
[0005] By adopting the above structure, this utility model enables the second positioning post and the first positioning post located at the front end of the positioning pin to position the inner conductive spring and the outer conductive spring respectively, thereby ensuring the coaxiality of the inner conductive spring and the outer conductive spring. After the electronic detonator lead plug is formed by injection molding in the cavity, the product accuracy of the electronic detonator lead can be ensured.
[0006] In one possible implementation, the support block is formed into a wedge-shaped structure that is wider at the top and narrower at the bottom. The lower mold is provided with a limiting groove that matches the support block. The support block is fitted into the limiting groove and is pressed onto the lower mold by the upper mold. With this structure, since the support block is formed into a wedge-shaped structure that is wider at the top and narrower at the bottom, and the lower mold is provided with a limiting groove that matches the support block, the support block can be reliably assembled onto the lower mold. Furthermore, the support block can be limited in front and behind by cooperating with the limiting groove.
[0007] In one possible implementation, springs are fixed at both ends of the limiting groove. The upper ends of the two springs abut against the bottom of the left and right ends of the support block and are used to apply an upward pushing force to the support block. With the springs, after the electronic detonator lead injection plug is injection molded and the upper mold is removed from the lower mold, the two springs can push the support block upward under the pushing force of the springs, so that the support block moves upward a certain distance, thereby facilitating the removal of the support block from the lower mold.
[0008] In one possible implementation, the bottom of the limiting groove is provided with a first slot corresponding vertically to each of the two springs. The lower end of each spring is inserted into the first slot at the corresponding position, and each spring is fixed to the lower mold by a bolt passing through the spring and threaded to the bottom of the first slot. The bottom of the support block is provided with a second slot corresponding vertically to each of the two springs. The upper end of each spring is inserted into the second slot at the corresponding position, and the top of each second slot is provided with a clearance hole for avoiding the upper end of the bolt. With this structure, the springs can be reliably fixed to the lower mold, and the first slots can reliably limit the horizontal movement of the springs. In addition, under the action of the second slots, after the support block is placed in the limiting groove, the upper end of the spring can be inserted into the second slot, thereby achieving horizontal limitation of the spring and the support block. This facilitates the assembly of the support block and the spring and improves the reliability when the support block and the spring are in contact. The clearance hole is used to avoid the bolt, so as to prevent the support block from interfering with the bolt during the downward movement.
[0009] In one possible implementation, the support block is provided with a plurality of first positioning holes spaced apart from left to right, and the lower mold is fixed with first positioning pins that are vertically corresponding to the plurality of first positioning holes. The upper end of each first positioning pin is inserted into the first positioning hole at the corresponding position. With this structure, the horizontal positioning of the support block and the limiting groove can be achieved by the cooperation of the first positioning holes and the first positioning pins, and the support block can be vertically guided when it moves up and down.
[0010] In one possible implementation, each positioning pin has an expansion portion with an outer diameter larger than the positioning pin at its rear end. The support block has countersunk holes corresponding to a plurality of positioning pins. Each positioning pin is inserted into the countersunk hole at its corresponding position from back to front. A screw is threaded to the rear end of each countersunk hole. The screw is used to press the expansion portion into the countersunk hole to secure the positioning pin to the support block. With this structure, when the screw presses the expansion portion into the countersunk hole, the positioning pin can be reliably fixed and limited on the support block. When the screw is removed, the positioning pin can be pulled out from the support block for easy replacement.
[0011] In one possible implementation, a first insert is embedded from bottom to top on the bottom of the lower mold and on the front side of each injection area. The first insert is pressed against the lower mold by a first pressure block located at the bottom of the first insert. A second insert is embedded from top to bottom on the top of the upper mold and on the front side of each injection area. The second insert is pressed against the upper mold by a second pressure block located at the top of the second insert. The injection gate is located on the second insert. The cavity at the tail end of the electronic detonator lead injection plug is formed between the first insert and the second insert. With this structure, when the shape or length of the tail end of the electronic detonator lead injection plug needs to be changed, only the corresponding first insert and second insert need to be replaced to meet the injection requirements of different types of electronic detonator lead injection plugs. This improves the versatility of the injection mold and reduces the development cost of the injection mold.
[0012] In one possible implementation, the lower mold is provided with a first insert hole for engaging with a first insert, one of the two opposing front and rear sides of the first insert forming a slope, and the first insert hole is adapted to the first insert; the upper mold is provided with a second insert hole for engaging with a second insert, one of the two opposing front and rear sides of the second insert forming a slope, and the second insert hole is adapted to the second insert; by adopting this structure, the first insert can be reliably inserted into the first insert hole, and the second insert can be reliably inserted into the second insert hole; in addition, under this fitting form, seams between the first insert and the lower mold and seams between the second insert and the upper mold can be avoided, thereby preventing flash from forming on the outer wall of the injection-molded plug of the electronic detonator lead wire after injection molding.
[0013] In one possible implementation, the lower mold has a second positioning pin vertically fixed at both ends, and the upper mold has a second positioning hole vertically provided at both ends. Each second positioning pin is inserted into the second positioning hole at the corresponding position. The left and right ends of the upper mold are locked or unlocked to the left and right ends of the lower mold by a locking assembly. With this structure, the positioning of the upper and lower molds can be conveniently and reliably achieved by the cooperation of the second positioning pins and the second positioning holes. In addition, the locking assembly can conveniently lock and unlock the upper and lower molds.
[0014] In one possible implementation, a plurality of glass ball screws are fixed on the lower mold, spaced apart in the circumferential direction around the lower mold, with the lower ends of the glass ball screws protruding from the lower end face of the lower mold. With this structure, under the action of the glass ball screws, during the process of the operator moving the injection mold, that is, during the process of the injection mold entering and leaving the injection molding machine, the friction between the injection mold and the support surface can be overcome, thereby facilitating the movement of the injection mold. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the first three-dimensional structure after the upper and lower molds are joined together.
[0016] Figure 2 This is a schematic diagram of the second three-dimensional structure after the upper and lower molds are joined together;
[0017] Figure 3 A schematic diagram of the three-dimensional structure of an electronic detonator lead plug after injection molding and opening of the upper and lower molds;
[0018] Figure 4 This is a schematic diagram of the three-dimensional structure after the support block and lower mold are separated.
[0019] Figure 5 for Figure 4 A magnified structural diagram of point A in the middle;
[0020] Figure 6 This is a cross-sectional view of the structure after the support block and the lower mold are assembled.
[0021] Figure 7 This is a schematic cross-sectional view of the upper and lower molds after they are joined together. Detailed Implementation
[0022] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.
[0023] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.
[0024] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0025] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0026] See Figure 1-7As shown in the embodiment of this application, an injection mold for an electronic detonator lead plug is disclosed, including a lower mold 1 and an upper mold 2 detachably connected to the lower mold 1; at least one injection area 3 is formed between the upper mold 2 and the lower mold 1, and each injection area 3 is provided with a plurality of cavities 31 spaced apart from left to right; the upper mold 2 is provided with injection gates 4 corresponding to and communicating with the plurality of cavities 31; a support block 5 is vertically fitted into the top of the rear side of the lower mold 1, and a positioning pin 6 corresponding to the plurality of cavities 31 is fixed on the front side of the support block 5; each positioning pin 6 is inserted into the cavity 31 at the corresponding position from back to front; the front end of each positioning pin 6 is coaxially provided with a first positioning post 61 with an outer diameter smaller than the positioning pin 6, and the front end of each first positioning post 61 is coaxially provided with a second positioning post 61 with an outer diameter smaller than the first positioning post 61. The second positioning post 62 is used to engage with the inner conductive spring in the electronic detonator lead wire to position the inner conductive spring. The first positioning post is used to engage with the outer conductive spring in the electronic detonator lead wire to position the outer conductive spring. When the plastic raw material is injected into the cavity 31 through the injection gate 4, the plastic raw material in the cavity 31 is solidified with the inner and outer conductive springs to form the electronic detonator lead wire injection plug 20. In addition, the front end of the first positioning post is provided with a first chamfered surface, and the front end of the second positioning post is provided with a second chamfered surface, so that the front end of the second positioning post can be inserted into the inner conductive spring in the electronic detonator lead wire and engage with the inner conductive spring for positioning, and so that the front end of the first positioning post can be inserted into the outer conductive spring in the electronic detonator lead wire and engage with the outer conductive spring for positioning.
[0027] The support block 5 forms a wedge-shaped structure that is wider at the top and narrower at the bottom. The lower mold 1 is provided with a limiting groove 11 that matches the support block 5. The support block 5 is fitted into the limiting groove 11 and is pressed onto the lower mold 1 by the upper mold 2. With this structure, since the support block 5 forms a wedge-shaped structure that is wider at the top and narrower at the bottom, and the lower mold 1 is provided with a limiting groove that matches the support block 5, the support block can be reliably assembled onto the lower mold. Furthermore, the support block can be limited in front and behind by cooperating with the limiting groove.
[0028] Springs 7 are fixed at both ends of the limiting groove 11. The upper ends of the two springs 7 abut against the bottom of the left and right ends of the support block 5 and are used to apply an upward pushing force to the support block 5. With the springs, after the electronic detonator lead injection plug is injection molded and the upper mold is removed from the lower mold, the two springs can push the support block upward under the pushing force of the springs, so that the support block moves upward a certain distance, thereby facilitating the removal of the support block from the lower mold. In addition, preferably, the distance by which the spring pushes the support block upward is 2mm.
[0029] The bottom of the limiting groove 11 is provided with a first slot 12 that corresponds vertically to the two springs 7. The lower end of each spring 7 is inserted into the first slot 12 at the corresponding position. Each spring 7 is fixed to the lower mold 1 by a bolt 71 that passes through the spring 7 and is threaded to the bottom of the first slot 12. The bottom of the support block 5 is provided with a second slot 51 that corresponds vertically to the two springs 7. The upper end of each spring 7 is inserted into the second slot 51 at the corresponding position. The top of each second slot 51 is provided with a clearance hole 5 for avoiding the upper end of the bolt 71. 2; By adopting this structure, the spring can be reliably fixed on the lower mold, and under the action of the first slot, the horizontal limit of the spring can be reliably achieved. In addition, under the action of the second slot, after the support block is placed in the limiting groove, the upper end of the spring can be inserted into the second slot, thereby achieving the horizontal limit of the spring and the support block. This facilitates the assembly of the support block and the spring and improves the reliability when the support block and the spring are in contact. The aforementioned clearance hole is used to avoid the bolt, so as to avoid interference between the support block and the bolt during the downward movement.
[0030] The support block 5 is provided with a number of first positioning holes 53 distributed from left to right. The lower mold 1 is fixed with first positioning pins 8 that are vertically corresponding to the number of first positioning holes 53. The upper end of each first positioning pin 8 is inserted into the first positioning hole 53 at the corresponding position. With this structure, the first positioning holes and the first positioning pins can be used to horizontally limit the support block and the limiting groove, and can also play a vertical guiding role when the support block moves up and down.
[0031] Each positioning pin 6 has an expansion portion 63 with an outer diameter larger than that of the positioning pin 6 at its rear end. The support block 5 has countersunk holes 54 corresponding to a number of positioning pins 6. Each positioning pin 6 is inserted into the countersunk hole 54 at its corresponding position from back to front. Each countersunk hole 54 has a screw 9 threaded to its rear end. The screw 9 is used to press the expansion portion 63 into the countersunk hole 54 to secure the positioning pin 6 to the support block 5. With this structure, when the screw presses the expansion portion into the countersunk hole, the positioning pin can be reliably fixed and limited on the support block. When the screw is removed, the positioning pin can be pulled out from the support block for easy replacement.
[0032] A first insert 13 is embedded from bottom to top on the bottom of the lower mold 1, which is located in front of each injection area 3. The first insert 13 is pressed against the lower mold 1 by a first pressure block 14 located at the bottom of the first insert 13. A second insert 21 is embedded from top to bottom on the top of the upper mold 2, which is located in front of each injection area 3. The second insert 21 is pressed against the upper mold 2 by a second pressure block 22 located at the top of the second insert 21. The injection gate 4 is located on the second insert 21. The cavity 31 at the tail end of the electronic detonator lead injection plug 20 is formed between the first insert 13 and the second insert 21. With this structure, when the shape of the tail end of the electronic detonator lead injection plug needs to be changed or the length of the tail end of the electronic detonator lead injection plug needs to be changed, only the corresponding first insert and second insert need to be replaced to meet the injection requirements of different types of electronic detonator lead injection plugs, thereby improving the versatility of the injection mold and reducing the development cost of the injection mold.
[0033] The lower mold 1 is provided with a first insert hole 15 for engaging with the first insert 13. One of the two opposing front and rear sides of the first insert 13 forms an inclined surface, and the first insert hole 15 is adapted to the first insert 13. The upper mold 2 is provided with a second insert hole 23 for engaging with the second insert 21. One of the two opposing front and rear sides of the second insert 21 forms an inclined surface, and the second insert hole 23 is adapted to the second insert 21. By adopting this structure, the first insert can be reliably inserted into the first insert hole, and the second insert can be reliably inserted into the second insert hole. In addition, under this fitting form, it is possible to avoid the formation of seams between the first insert and the lower mold, and to avoid the formation of seams between the second insert and the upper mold, thereby preventing flash from forming on the outer wall of the injection plug of the electronic detonator lead after injection molding.
[0034] The lower mold 1 has two vertically fixed second positioning pins 16 at both ends, and the upper mold 2 has two vertically set second positioning holes 24 at both ends. Each second positioning pin 16 is inserted into the corresponding second positioning hole 24. The left and right ends of the upper mold 2 are locked or unlocked to the left and right ends of the lower mold 1 by a locking assembly 25. With this structure, the positioning of the upper and lower molds can be conveniently and reliably achieved by the cooperation of the second positioning pins and the second positioning holes. In addition, the locking assembly can conveniently lock and unlock the upper and lower molds. The locking assembly is an existing component on the market and will not be described in detail here.
[0035] A number of glass ball screws 10 are fixed on the lower mold 1, which are spaced apart in the circumferential direction around the lower mold 1. The lower end of the glass ball screw 10 protrudes from the lower end face of the lower mold 1. With this structure, under the action of the glass ball screws, the friction between the injection mold and the support surface can be overcome during the process of the operator moving the injection mold, that is, during the process of the injection mold entering and leaving the injection molding machine, thereby facilitating the movement of the injection mold.
[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. An injection mold for an electronic detonator lead plug, comprising a lower mold (1) and an upper mold (2) detachably connected to the lower mold (1); characterized in that: At least one injection area (3) is formed between the upper mold (2) and the lower mold (1). Each injection area (3) is provided with a plurality of cavities (31) spaced apart from left to right. The upper mold (2) is provided with injection gates (4) that correspond one-to-one with and communicate with the plurality of cavities (31). A support block (5) is vertically fitted into the top of the rear side of the lower mold (1). The front side of the support block (5) is fixed with positioning pins (6) that correspond one-to-one with the plurality of cavities (31). Each positioning pin (6) is inserted from back to front into the cavity (31) at the corresponding position. The front end of each positioning pin (6) is coaxially provided with an outer... A first positioning post (61) with a diameter smaller than the positioning pin (6) is provided on the front end of each first positioning post (61) with a second positioning post (62) having an outer diameter smaller than the first positioning post (61). The second positioning post (62) is used to cooperate with the inner conductive spring in the electronic detonator lead wire to realize the positioning of the inner conductive spring. The first positioning post is used to cooperate with the outer conductive spring in the electronic detonator lead wire to realize the positioning of the outer conductive spring. When the plastic raw material is injected into the cavity (31) through the injection gate (4), the plastic raw material in the cavity (31) is solidified with the inner conductive spring and the outer conductive spring to form the electronic detonator lead wire injection plug (20).
2. The injection mold for the electronic detonator lead plug according to claim 1, characterized in that: The support block (5) forms a wedge-shaped structure that is wider at the top and narrower at the bottom. The lower mold (1) is provided with a limiting groove (11) that is compatible with the support block (5). The support block (5) is fitted into the limiting groove (11). The support block (5) is pressed onto the lower mold (1) by the upper mold (2).
3. The injection mold for the electronic detonator lead plug according to claim 2, characterized in that: Springs (7) are fixed at both ends of the limiting groove (11). The upper ends of the two springs (7) abut against the bottom of the left and right ends of the support block (5) and are used to apply an upward thrust to the support block (5).
4. The injection mold for the electronic detonator lead plug according to claim 3, characterized in that: The bottom of the limiting groove (11) is provided with a first slot (12) that is vertically corresponding to the two springs (7). The lower end of each spring (7) is inserted into the first slot (12) at the corresponding position. Each spring (7) is fixed to the lower mold (1) by a bolt (71) that passes through the spring (7) and is threaded to the bottom of the first slot (12). The bottom of the support block (5) is provided with a second slot (51) that is vertically corresponding to the two springs (7). The upper end of each spring (7) is inserted into the second slot (51) at the corresponding position. The top of each second slot (51) is provided with a clearance hole (52) for avoiding the upper end of the bolt (71).
5. The injection mold for the electronic detonator lead plug according to any one of claims 1-4, characterized in that: The support block (5) is provided with a number of first positioning holes (53) spaced from left to right. The lower mold (1) is fixed with first positioning pins (8) that are vertically corresponding to the number of first positioning holes (53). The upper end of each first positioning pin (8) is inserted into the first positioning hole (53) at the corresponding position.
6. The injection mold for the electronic detonator lead plug according to claim 1, characterized in that: Each of the positioning pins (6) has an expansion portion (63) with an outer diameter larger than that of the positioning pin (6) at its rear end. The support block (5) has countersunk holes (54) that correspond one-to-one with the positioning pins (6). Each positioning pin (6) is inserted into the countersunk hole (54) at the corresponding position from back to front. Each countersunk hole (54) has a screw (9) threaded to its rear end. The screw (9) is used to press the expansion portion (63) into the countersunk hole (54) so that the positioning pin (6) is fastened to the support block (5).
7. The injection mold for the electronic detonator lead plug according to claim 1, characterized in that: The lower mold (1) is fitted with a first insert (13) from bottom to top at the bottom of each injection area (3). The first insert (13) is pressed against the lower mold (1) by a first pressure block (14) at the bottom of the first insert (13). The upper mold (2) is fitted with a second insert (21) from top to bottom at the top of each injection area (3). The second insert (21) is pressed against the upper mold (2) by a second pressure block (22) at the top of the second insert (21). The injection gate (4) is set on the second insert (21). The cavity (31) at the tail end of the electronic detonator lead injection plug (20) is formed between the first insert (13) and the second insert (21).
8. The injection mold for the electronic detonator lead plug according to claim 7, characterized in that: The lower mold (1) is provided with a first inlay hole (15) for fitting with the first insert (13). One of the two front and rear facing surfaces of the first insert (13) forms an inclined surface. The first inlay hole (15) is adapted to the first insert (13). The upper mold (2) is provided with a second inlay hole (23) for fitting with the second insert (21). One of the two front and rear facing surfaces of the second insert (21) forms an inclined surface. The second inlay hole (23) is adapted to the second insert (21).
9. The injection mold for the electronic detonator lead plug according to claim 1, characterized in that: The lower mold (1) is vertically fixed with second positioning pins (16) at both ends, and the upper mold (2) is vertically provided with second positioning holes (24) at both ends. Each second positioning pin (16) is inserted into the second positioning hole (24) at the corresponding position. The left and right ends of the upper mold (2) are locked or unlocked with the left and right ends of the lower mold (1) by a locking assembly (25).
10. The injection mold for the electronic detonator lead plug according to claim 1, characterized in that: A plurality of glass ball screws (10) are fixed on the lower mold (1) and spaced apart in the circumferential direction around the lower mold (1). The lower end of the glass ball screws (10) protrudes from the lower end face of the lower mold (1).