Display stand column injection mold

Abstract

The utility model discloses a display stand column injection mold which comprises an upper mold and a lower mold, the upper mold comprises a top plate, a fixing plate and an upper mold plate which are sequentially bolted, a pouring gate is bolted in the middle of the top end of the top plate, the lower mold comprises a bottom plate, a material pushing plate, a supporting plate and a lower mold plate, and an upper mold core is bolted in the middle of the bottom end of the upper mold plate; the upper mold cavity, the lower mold cavity, the forming convex block, the forming boss, the forming convex strip and the forming strip plate are arranged in the upper mold core and the lower mold core and are matched with the short core column and the long core column, so that the mold can be used for injection molding of the stand column, and meanwhile, the stand column is inconvenient to produce due to the fact that the stand column is long. Therefore, the first core pulling mechanism and the second core pulling mechanism are adopted for bidirectional core pulling, meanwhile, the short core column and the long core column are matched with the forming protruding block and the forming boss to form the key groove part and the internal structure of the stand column, the demolding efficiency can be guaranteed through bidirectional core pulling, the integrity of the internal structure of the stand column is guaranteed, and the reject ratio is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a display column injection mold. Background Technology

[0002] Injection molding is a method of industrial product manufacturing. Products are typically manufactured using rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding compression molding and die casting. An injection molding machine is the main molding equipment used to create various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. Injection molding is achieved through an injection molding machine and molds.

[0003] With the continuous development and progress of social civilization, people's living standards are constantly improving, and display devices such as televisions and computers are gradually becoming commonplace in every household. Existing television and computer peripherals generally include a monitor, monitor casing, support column, and base. The column connects the base to the monitor and its casing, providing support. Currently, most columns are injection-molded into hollow shapes with a keyway-shaped cross-section, such as... Figure 1 As shown, the interior of the column is hollow, and one end of it has a keyway a and a mounting slot b. Inside, on the left side of the keyway a, there are two mounting holes c, four horizontal retaining strips d along the length direction, and connecting ribs e. Inside, on the right side of the keyway a, there are two vertical dividing strips f. All of these structures are produced by injection molding. However, the column has a thin wall and a long length, making demolding difficult and resulting in a high defect rate. Therefore, a display column injection mold is designed to overcome these technical defects. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a display column injection mold to solve the above-mentioned technical problems.

[0006] (2) Technical solution

[0007] To solve the above-mentioned technical problems, this utility model provides a display column injection mold, including an upper mold and a lower mold. The upper mold includes a top plate, a fixed plate and an upper template bolted together in sequence. A gate is bolted to the top center of the top plate. The lower mold includes a bottom plate, a push plate, a support plate and a lower template. An upper mold core is bolted to the bottom center of the upper template. A main runner communicating with the gate is provided in the middle between the upper template and the fixed plate. Branch runners are provided in the middle of both ends of the upper template and the middle of both ends of the upper mold core. A through upper mold cavity is provided in the middle of the bottom end of the upper mold core. A lower mold core is bolted to the middle of the top of the lower template. A through lower mold cavity is provided in the middle of the top of the lower mold core. A first core-pulling mechanism and a second core-pulling mechanism are respectively provided between the two ends of the upper template and the two ends of the lower template. One end of the first core-pulling mechanism and one end of the second core-pulling mechanism extend to the space between the upper mold core and the lower mold core to form a molding cavity.

[0008] Preferably, the upper mold cavity is arc-shaped, and the left end of the upper mold cavity is provided with a conical extrusion. A forming protrusion is integrally formed in the middle of the inner top wall of the upper mold cavity and on the side near the conical extrusion.

[0009] Preferably, a forming strip is integrally formed on the right end of the inner top wall of the upper mold cavity, and forming protrusions are provided on both sides of the forming strip at intervals. A round hole adapted to the corresponding branch channel is provided in the middle of the conical surface opening and on the side near the forming protrusion.

[0010] Furthermore, the lower mold cavity is arc-shaped, and a conical vent is provided at the left end of the inner top wall of the lower mold cavity. A forming boss is integrally formed in the middle of the lower mold cavity at a position corresponding to the forming protrusion, and the upper surface of the forming boss is in contact with the lower surface of the forming protrusion.

[0011] Furthermore, two symmetrically distributed frustums are integrally formed at the right end of the top wall of the lower mold cavity. The upper surface of the lower mold plate is provided with a first mounting groove and a second mounting groove at the two ends corresponding to the lower mold core. The size of the first mounting groove is smaller than that of the second mounting groove. A positioning block is integrally formed in the middle of the inner bottom wall of the second mounting groove.

[0012] Furthermore, the first core-pulling mechanism includes a first hydraulic cylinder, which is bolted to the left center of the lower template via a first mounting bracket. Steps are provided on both sides of the inner interior of the first mounting bracket and both sides of the inner interior of the first mounting groove, with guide strips bolted to the top of the steps. A first slider is mounted on the telescopic end of the first hydraulic cylinder, with its two ends slidably connected between the guide strips on both sides and the first mounting bracket, respectively. The end of the first slider away from the first hydraulic cylinder extends into the first mounting groove, and a first core seat is bolted to the center of the extended end of the first slider. The end away from the first slider is provided with a conical slope that matches the conical surface opening. The middle of the conical slope is provided with an oblique hole that communicates with the round hole. The end of the first core seat away from the first slider is also formed with a short core column. The middle of the end of the short core column away from the first core seat is provided with a first clearance groove that matches the forming protrusion. The gap between the first clearance groove and the outer left end of the forming protrusion is provided. The middle of the inner wall of the first clearance groove and the middle of the short core column are provided with two identical hole seat forming grooves. The middle of the opening end of the first clearance groove is integrally formed with a positioning boss.

[0013] Furthermore, the second core-pulling mechanism includes a second hydraulic cylinder, which is bolted to the inside of the second mounting groove via a second mounting bracket. The bottom end of the second mounting bracket is provided with a positioning groove that matches the positioning block. Steps are provided on both sides of the inside of the second mounting bracket, and guide strips are bolted to the steps. A limit block is bolted to the inside of the end of the second mounting bracket away from the second hydraulic cylinder. A second slider is installed on the telescopic end of the second hydraulic cylinder. The two ends of the second slider are slidably connected between the corresponding guide strips and the second mounting bracket. A long core column is bolted to the middle of the end of the second slider away from the second hydraulic cylinder via a second core seat. The end of the long core column away from the second core seat slides through the middle of the limit block and extends to the space between the upper mold cavity and the lower mold cavity.

[0014] Furthermore, the long core post has a second clearance groove at the middle of the end away from the second core seat, which is adapted to the forming protrusion. The second clearance groove is spaced apart from the outer right end of the forming protrusion. The inner wall of the second clearance groove has two symmetrically distributed dividing strip forming grooves. The middle of both sides of the long core post has two symmetrically distributed retaining strip forming grooves. The middle of the opening end of the second clearance groove has a positioning groove, and the positioning protrusion is slidably connected to the inside of the positioning groove. The long core post and the short core post are connected at the joint.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention, by setting an upper mold cavity, a lower mold cavity, a forming protrusion, a forming boss, a forming strip, and a forming plate within the upper and lower mold cores, along with short and long core pillars, enables the mold to injection mold the column. Since the column is relatively long and inconvenient to produce, a first and a second core-pulling mechanism are used for bidirectional core pulling. Simultaneously, the short and long core pillars, together with the forming protrusion and forming boss, form the keyway portion and internal structure of the column. This bidirectional core pulling not only ensures demolding efficiency but also guarantees the integrity of the column's internal structure, significantly reducing the defect rate. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the column product of this utility model;

[0019] Figure 2 This is a three-dimensional structural diagram of the mold used to produce the product in this utility model;

[0020] Figure 3 This is a cross-sectional view of the mold used to produce the product in this utility model.

[0021] Figure 4 This is an exploded structural diagram of the mold used to produce the product in this utility model;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the upper mold core in this utility model;

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the lower mold core of this utility model;

[0024] Figure 7 This is a three-dimensional structural diagram of the first core-pulling mechanism in this utility model;

[0025] Figure 8 This is a three-dimensional structural diagram of the second core-pulling mechanism in this utility model.

[0026] The markings in the attached diagram are as follows: a) Keyway; b) Mounting slot; c) Mounting hole seat; d) Locking strip; e) Connecting rib; f) Separator strip; 1. Upper mold; 101. Top plate; 102. Fixing plate; 103. Upper template; 104. Gate; 105. Main runner; 106. Branch runner; 2. Lower mold; 201. Base plate; 202. Push plate; 203. Support plate; 204. Lower template; 205. First mounting slot; 206. Second mounting slot; 3. First core-pulling mechanism; 301. First hydraulic cylinder; 302. First mounting bracket; 303. First slider; 4. Second core-pulling machine. Structure; 401, Second hydraulic cylinder; 402, Second mounting bracket; 403, Second slider; 404, Limiting block; 5, Upper mold core; 501, Upper mold cavity; 502, Forming protrusion; 503, Forming protrusion; 504, Forming strip; 6, Lower mold core; 601, Lower mold cavity; 602, Forming boss; 7, Guide strip; 8, First core seat; 801, Short core post; 802, First clearance groove; 803, Hole seat forming groove; 804, Positioning boss; 9, Long core post; 901, Second clearance groove; 902, Separator strip forming groove; 903, Clip strip forming groove; 904, Positioning groove. Detailed Implementation

[0027] This specific embodiment is a display column injection mold, the structural schematic diagram of which is shown below. Figures 1-8 As shown, the mold includes an upper mold 1 and a lower mold 2. The upper mold 1 includes a top plate 101, a fixed plate 102, and an upper mold plate 103 that are bolted together in sequence. A gate 104 is bolted to the top center of the top plate 101. The lower mold 2 includes a bottom plate 201, a push plate 202, a support plate 203, and a lower mold plate 204. An upper mold core 5 is bolted to the bottom center of the upper mold plate 103. A main runner 105 communicating with the gate 104 is provided in the middle between the upper mold plate 103 and the fixed plate 102. The upper mold plate 103 is located at both ends of the upper mold plate 103 and the middle of the upper mold. Both ends of the upper mold core 5 are provided with branch channels 106. The bottom end of the upper mold core 5 is provided with a through upper mold cavity 501. The top end of the lower mold plate 204 is bolted with a lower mold core 6. The top end of the lower mold core 6 is provided with a through lower mold cavity 601. The two ends of the upper mold plate 103 and the two ends of the lower mold plate 204 are respectively provided with a first core pulling mechanism 3 and a second core pulling mechanism 4. One end of the first core pulling mechanism 3 and one end of the second core pulling mechanism 4 extend to the space between the upper mold core 5 and the lower mold core 6 to form a molding cavity.

[0028] Specifically, the mold is installed on an injection molding machine. The controller on the injection molding machine controls the first core-pulling mechanism 3 and the second core-pulling mechanism 4 to extend and enter the upper mold cavity 501 and the lower mold cavity 601, forming the molding cavity for the product with the upper mold core 5, upper mold cavity 501, lower mold core 6, and lower mold cavity 601. Simultaneously, during injection, the molten material enters the main runner 105 through the gate 104, and then flows to both ends of the main runner 105 into the branch runners 106. The molten material is injected into the lower mold cavity 601 through the left-hand branch runner 106. The material enters the upper mold cavity 501 through the branch channel 106 at the right end. Bidirectional injection molding can improve production efficiency and ensure product quality. When the mold is opened, the upper mold 1 and the lower mold 2 are separated by the injection molding machine. At the same time, the upper mold 1 can pull the material head to make the top of the product part. Then the injection molding machine controls the first core pulling mechanism 3 and the second core pulling mechanism 4 to reset and separate from the inner cavity of the product to complete the core pulling. Finally, the product is ejected by the push plate 202. There are two push plates 202, and the middle of the two push plates 202 is provided with an ejector pin to eject the product out of the lower mold cavity 601.

[0029] Furthermore, the upper mold cavity 501 is arc-shaped, and a conical release opening is provided at the left end of the upper mold cavity 501. A forming protrusion 502 is integrally formed in the middle of the inner top wall of the upper mold cavity 501 and on the side near the conical release opening. The arc-shaped surface inside the upper mold cavity 501, together with the first core-pulling mechanism 3 and the second core-pulling mechanism 4, can form the top shape of the product. The conical release opening forms a certain angle with the middle inner wall of the upper mold cavity 501, which facilitates the first core-pulling mechanism 3 to pull the core and demold. The forming protrusion 502, together with the upper mold cavity 501, the first core-pulling mechanism 3, the second core-pulling mechanism 4 and the lower mold cavity 601, forms the keyway a of the product.

[0030] In addition, a forming strip 504 is integrally formed on the right end of the inner top wall of the upper mold cavity 501, and forming protrusions 503 are provided on both sides of the forming strip 504 at intervals. A round hole adapted to the corresponding branch channel 106 is provided in the middle of the conical opening and on the side near the forming protrusion 502. The forming strip 504 and the forming protrusions 503 on both sides, together with the second core pulling mechanism 4 and the upper mold cavity 501, can form the structure of the mounting slot b of the product.

[0031] Furthermore, the lower mold cavity 601 is arc-shaped, and a conical release opening is provided at the left end of the inner top wall of the lower mold cavity 601. A molding boss 602 is integrally formed in the middle of the lower mold cavity 601 at a position corresponding to the molding protrusion 502, and the upper surface of the molding boss 602 is in contact with the lower surface of the molding protrusion 502. The arc-shaped lower mold cavity 601 and the upper mold cavity 501 can form the shape of the product. The conical release opening on the upper mold cavity 501 and the conical release opening on the lower mold cavity 601 can cooperate with the first core pulling mechanism 3 to form the left end shape of the product and facilitate demolding. At the same time, the cross sections of the molding boss 602 and the molding protrusion 502 are the same as the cross section of the keyway a, so that the two form the keyway a during injection molding.

[0032] In addition, two symmetrically distributed frustums are integrally formed at the middle of the right end of the inner top wall of the lower mold cavity 601. The upper surface of the lower mold plate 204 is provided with a first mounting groove 205 and a second mounting groove 206 at the two ends corresponding to the lower mold core 6. The size of the first mounting groove 205 is smaller than that of the second mounting groove 206. A positioning block is integrally formed at the middle of the inner bottom wall of the second mounting groove 206. There are two positioning holes at the bottom right end of the product, and the frustum at the right end of the lower mold cavity 601 can form the positioning holes. During stripping, the pusher plate 202 drives the ejector pin to push the product out and separate it from the frustum. The first mounting groove 205 can be used to install and position the first core pulling mechanism 3, and the second mounting groove 206 can be used to install and position the second core pulling mechanism 4.

[0033] Furthermore, the first core-pulling mechanism 3 includes a first hydraulic cylinder 301, which is bolted to the middle left side of the lower template 204 via a first mounting bracket 302. Steps are provided on both sides of the interior of the first mounting bracket 302 and both sides of the interior of the first mounting groove 205, and guide strips 7 are bolted to the top of the steps. A first slider 303 is mounted on the telescopic end of the first hydraulic cylinder 301. The two ends of the first slider 303 are slidably connected between the guide strips 7 on both sides and the first mounting bracket 302, respectively. The first slider 303 is located away from the first... One end of a hydraulic cylinder 301 extends into a first mounting groove 205. A first core seat 8 is bolted to the middle of the extended end of a first slider 303. The end of the first core seat 8 away from the first slider 303 has a conical slope that matches the conical surface opening. The middle of the conical slope has an oblique hole that communicates with a round hole. A short core post 801 is formed together with the end of the first core seat 8 away from the first slider 303. The middle of the end of the short core post 801 away from the first core seat 8 has a first clearance groove 802 that matches the forming protrusion 502. A gap is provided between the first clearance groove 802 and the outer left end of the forming protrusion 502. Two identical hole-seat forming grooves 803 are provided in the middle of the inner wall of the first clearance groove 802 and the middle of the short core post 801. A positioning protrusion 804 is integrally formed in the middle of the opening end of the first clearance groove 802. During core pulling and demolding, after the upper mold 1 separates from the lower mold 2, the first hydraulic cylinder 301 resets and drives the first slider 303 to slide on the first mounting groove 205 and the first mounting bracket 302, causing the first slider 303 to... The first core seat 8 and the short core post 801 move to the left, causing the first core seat 8 to disengage from the two conical release holes and driving the short core post 801 to disengage from the inner cavity of the product. The short core post 801, in conjunction with the upper mold cavity 501 and the lower mold cavity 601, can form the left end shape of the product. The first clearance groove 802, together with the forming protrusion 502 and the forming boss 602, forms the shape of the keyway a of the product. The hole seat forming groove 803 is provided with a forming ejector pin, which, in conjunction with the other two, can form the mounting hole seat c and the H-shaped connecting rib e on the product.

[0034] Furthermore, the second core-pulling mechanism 4 includes a second hydraulic cylinder 401, which is bolted to the inside of the second mounting groove 206 via a second mounting bracket 402. The bottom end of the second mounting bracket 402 is provided with a positioning groove that matches the positioning block. Steps are provided on both sides of the inside of the second mounting bracket 402, and guide strips 7 are bolted to the steps. A limit block 404 is bolted to the inside of the end of the second mounting bracket 402 away from the second hydraulic cylinder 401. A second slider 403 is installed on the telescopic end of the second hydraulic cylinder 401, and the two ends of the second slider 403 slide. Connected between the corresponding guide strip 7 and the second mounting bracket 402, the middle of the end of the second slider 403 away from the second cylinder 401 is bolted with a long core column 9 through the second core seat. The end of the long core column 9 away from the second core seat slides through the middle of the limiting block 404 and extends to the space between the upper mold cavity 501 and the lower mold cavity 601. The middle of the end of the long core column 9 away from the second core seat is provided with a second clearance groove 901 adapted to the forming protrusion 502. The second clearance groove 901 is spaced apart from the outer right end of the forming protrusion 502. The inner wall has two symmetrically distributed partition strip forming grooves 902 in the middle, and two symmetrically distributed retaining strip forming grooves 903 on both sides of the long core column 9. The middle of the opening end of the second clearance groove 901 has a positioning groove 904, and the positioning boss 804 is slidably connected to the inside of the positioning groove 904. The long core column 9 and the short core column 801 are connected at the joint. The second oil cylinder 401 is reset and drives the second core seat to move to the right. The second core seat drives the long core column 9 to move to the right and perform core pulling. The long core column 9 cooperates with the upper mold cavity 501 and the lower mold cavity. 601 can form the right end shape of the product. The second clearance groove 901, together with the forming protrusion 502 and the forming boss 602, forms the right end shape of the keyway part a of the product. At the same time, the positioning groove 904 on the second clearance groove 901, together with the positioning boss 804, can ensure that the short core 801 and the long core 9 work together to ensure the quality of the product. Meanwhile, the separator strip forming groove 902 and the card strip forming groove 903, together with the long core 9, the upper mold cavity 501 and the lower mold cavity 601, form two separator strips f and four card strips d of the product.

[0035] All technical features in this embodiment can be freely combined according to actual needs.

[0036] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A display stand injection mold, comprising an upper mold (1) and a lower mold (2), the upper mold (1) comprising a top plate (101), a fixed plate (102) and an upper mold plate (103) sequentially bolted, the middle of the top end of the top plate (101) is bolted with a gate (104), the lower mold (2) comprising a bottom plate (201), a pushing plate (202), a supporting plate (203) and a lower mold plate (204), characterized in that, The bottom middle of the upper die plate (103) is bolted with an upper die core (5), the middle between the upper die plate (103) and the fixed plate (102) is provided with a main runner (105) communicated with a gate (104), the middle of both ends of the upper die plate (103) and the middle of both ends of the upper die core (5) are provided with branch runners (106), the bottom middle of the upper die core (5) is provided with a through upper die cavity (501), the top middle of the lower die plate (204) is bolted with a lower die core (6), the top middle of the lower die core (6) is provided with a through lower die cavity (601), the two ends of the upper die plate (103) and the two ends of the lower die plate (204) are respectively provided with a first core pulling mechanism (3) and a second core pulling mechanism (4), one end of the first core pulling mechanism (3) and one end of the second core pulling mechanism (4) respectively extend to between the upper die core (5) and the lower die core (6) and form a molding cavity.

2. A display stand injection mold according to claim 1, characterized in that: The upper die cavity (501) is arranged in an arc shape, and the left end of the upper die cavity (501) is provided with a taper demoulding, and the inner top wall of the upper die cavity (501) is integrally formed with a molding protrusion (502) near one side of the taper demoulding.

3. A display stand injection mold according to claim 2, characterized in that: The inner top wall of the upper die cavity (501) is integrally formed with a molding strip (504) at the right end, and the molding strip (504) is provided with a molding protruding strip (503) at both sides, and the middle of the taper demoulding is provided with a circular hole corresponding to the branch runner (106).

4. A display stand injection mold according to claim 3, characterized in that: The lower die cavity (601) is arranged in an arc shape, and the left end of the inner top wall of the lower die cavity (601) is provided with a taper demoulding, and the middle of the lower die cavity (601) is integrally formed with a molding boss (602) corresponding to the molding protrusion (502), and the upper surface of the molding boss (602) is in contact with the lower surface of the molding protrusion (502).

5. A display stand injection mold according to claim 4, characterized in that: The right middle of the inner top wall of the lower die cavity (601) is integrally formed with two symmetrically distributed circular tables, the upper surface of the lower die plate (204) is provided with a first installation groove (205) and a second installation groove (206) corresponding to the lower die core (6) at both ends, the size of the first installation groove (205) is smaller than the size of the second installation groove (206), and the inner bottom wall of the second installation groove (206) is integrally formed with a positioning block.

6. A display stand injection mold according to claim 5, characterized in that: The first core pulling mechanism (3) comprises a first oil cylinder (301), which is bolted to the middle part of the left side of the lower die plate (204) through a first mounting frame (302), the inner sides of the first mounting frame (302) and the inner sides of the first mounting groove (205) are provided with steps, and the top of the steps is bolted with a guide strip (7), the telescopic end of the first oil cylinder (301) is provided with a first sliding block (303), the two ends of the first sliding block (303) are respectively connected between the two guide strips (7) and the first mounting frame (302), the end of the first sliding block (303) away from the first oil cylinder (301) extends into the first mounting groove (205), the middle part of the extending end of the first sliding block (303) is bolted with a first core seat (8), the end of the first core seat (8) away from the first sliding block (303) is provided with a conical slope surface matched with the taper mouth, the middle part of the conical slope surface is provided with a inclined hole communicated with the circular hole, the end of the first core seat (8) away from the first sliding block (303) is integrally formed with a short core column (801), the middle part of the end of the short core column (801) away from the first core seat (8) is provided with a first air avoidance groove (802) matched with the forming protrusion (502), the first air avoidance groove (802) is arranged in a gap between the left end of the outer side of the forming protrusion (502), the inner wall of the first air avoidance groove (802) and the middle part of the short core column (801) are provided with two same hole seat forming grooves (803), and the middle part of the opening end of the first air avoidance groove (802) is integrally formed with a positioning boss (804).

7. A display stand injection mold according to claim 6, characterized in that: The second core pulling mechanism (4) comprises a second oil cylinder (401), which is bolted to the inside of the second mounting groove (206) through a second mounting frame (402), and the bottom end of the second mounting frame (402) is provided with a positioning groove matched with the positioning block, the inner sides of the second mounting frame (402) are provided with steps, and the steps are bolted with guide strips (7), the inside of the end of the second mounting frame (402) away from the second oil cylinder (401) is bolted with a limiting block (404), the telescopic end of the second oil cylinder (401) is provided with a second sliding block (403), the two ends of the second sliding block (403) are connected between the corresponding guide strips (7) and the second mounting frame (402), the middle part of the end of the second sliding block (403) away from the second oil cylinder (401) is bolted with a long core column (9) through a second core seat, and the end of the long core column (9) away from the second core seat slides through the middle part of the limiting block (404) and extends between the upper die cavity (501) and the lower die cavity (601).

8. A display stand injection mold according to claim 7, characterized in that: The middle part of the long core column (9) far away from the one end of the second core seat is provided with a second empty slot (901) matched with the shaped protrusion (502), the second empty slot (901) is provided with a gap on the outside of the right end of the shaped protrusion (502), the middle part of the inner wall of the second empty slot (901) is provided with two symmetrical distribution of the partition strip shaped slot (902), the middle part of the two sides of the long core column (9) is provided with two symmetrical distribution of the clamping strip shaped slot (903), the middle part of the opening end of the second empty slot (901) is provided with the positioning groove (904), and the positioning convex (804) is slidably connected to the inside of the positioning groove (904), and the long core column (9) is connected with the short core column (801).

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