A shoe sole forming device

Abstract

The present invention relates to the field of sole processing technology. The present invention discloses a sole molding device, including a base, a sliding frame capable of sliding is installed on the base, an injection mold is installed on the sliding frame, an injection part for injecting into the injection mold is provided at the upper end of the injection mold, a separation unit is also installed at the upper end of the base, and the separation unit is used to separate the injection mold; the injection mold includes multiple groups of mold blocks, the multiple groups of mold blocks are arranged in two rows to form the sole, and the outer sides of the multiple groups of mold blocks are provided with ferrules. The present invention can disperse the force borne by each mold block relatively, which helps to reduce the tearing force generated on the molded sole during the demoulding process, so that the sole molding effect is good, the two rows of mold blocks can move along the slide bar and the metal shaft, and the two rows of mold blocks are relatively limited to avoid deviation of the injection molded sole, and also improve the convenience of operation.

Description

Technical Field

[0001] The invention relates to the technical field of sole processing, in particular to a sole molding device. Background Art

[0002] Injection molding is a molding method that combines injection and molding, also known as injection molding plasticization. The general injection molding method is to put the granules or powders of the polymer components into the barrel of the injection molding machine, and then homogenize and melt the materials through heating, compression, shearing, mixing and conveying. This process is also called plasticization. Then, the screw is used to apply pressure to the melted polymer melt, and the high-temperature melt is injected into the pre-closed low-temperature mold cavity through the nozzle in front of the barrel and the runner system of the mold. After cooling and shaping, the mold can be opened and the product can be ejected, thus obtaining a plastic product with a certain geometric shape and precision.

[0003] Injection molding of soles usually uses materials such as thermoplastics and thermoplastic elastomers. The pretreated raw materials are placed in the barrel of the injection molding machine, heated to a molten state, and the molten plastic is injected into the mold cavity of the mold through a screw. At the same time, a certain pressure and temperature are applied and maintained for a certain period of time to allow the plastic to fully cool and solidify in the mold. The mold is opened and the molded sole is taken out.

[0004] The injection pressure, temperature, time and other parameters of the injection machine need to be precisely controlled. If the injection pressure is insufficient, the material may not be able to completely fill the mold cavity, resulting in sticking between the sole and the mold. If the temperature is too high or the cooling time is insufficient, the material may not be completely solidified, which will also cause sticking problems. Therefore, during the processing of the sole, there is a situation where the sole adheres to the mold. If the mold is opened directly, it is easy to cause the solidified sole to tear or be defective, and the sole will be scrapped. It is more likely to cause the plastic to adhere to the mold and be difficult to remove, and the mold needs to be further cleaned. Summary of the invention

[0005] The object of the present invention is to provide a sole molding device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a sole molding device, comprising a base, a sliding frame capable of sliding is installed on the base, an injection mold is installed on the sliding frame, an injection part for injecting into the injection mold is provided at the upper end of the injection mold, and a separation unit is also installed at the upper end of the base, and the separation unit is used to separate the injection mold;

[0007] The injection mold comprises a plurality of groups of mold blocks, which are arranged in two rows and are used to mold the soles, and the outer sides of the plurality of groups of mold blocks are provided with ferrules;

[0008] The separation unit comprises two groups of metal shafts, the two groups of metal shafts are respectively sleeved with the outer rings of the two rows of mold blocks, and the two rows of mold blocks are respectively moved along the two groups of metal shafts to achieve separation.

[0009] Furthermore, the sliding frame is slidably installed on the upper end of the base, the sliding frame is divided into two halves, a sliding rod is fixed between the two halves of the sliding frame, and multiple groups of mold blocks have sliding openings at the lower ends, the sliding rod cooperates with the sliding openings, two rows of mold blocks are slidably installed on the sliding rod, and one sliding rod has two matching mold blocks.

[0010] Furthermore, the slide bar and the slide opening are both arranged in a "T" shape, which are used to limit the mold block so that it can only slide horizontally.

[0011] Furthermore, the ring on the outside of the mold block is hingedly connected to the mold block, and the separation unit also includes two groups of support plates, both of which are fixed to the base, and both of which are fixed between the two groups of support plates. The two groups of metal shafts are symmetrically arranged and both have bent parts. When the sliding frame slides, the ring slides along the metal shaft, so that the metal shaft drives the two rows of mold blocks to separate.

[0012] Furthermore, the metal shaft includes metal segment 1, metal segment 2 and metal segment 3, the outer ends of the metal segment 2 and metal segment 3 are respectively fixed to the support plates on both sides, the metal segment 1 is connected between the metal segment 2 and the metal segment 3, and the metal segment 1 is sleeved with the ferrule;

[0013] The metal segment 2 is located on the extension line of the metal segment 1, and the portion of the metal segment 2 close to the metal segment 1 has a protrusion protruding outward, and the protrusion can only accommodate one mold block, and the metal segment 3 is parallel to the metal segment 1, and the metal segment 3 is located outside the metal segment 1;

[0014] The second metal segment is used to separate a group of relative mold blocks in two rows of mold blocks, and as the two rows of mold blocks move, multiple groups of mold blocks are first separated from the sole, and the third metal segment is used to separate both rows of mold blocks and take out the sole.

[0015] Furthermore, the injection molding part includes a support frame fixed on the base, and two groups of symmetrical extrusion frames are fixed at the lower end of the support frame. The inner side of the extrusion frame clamps an extrusion block, and the extrusion block is used to push the mold block on one side, so that the inside of the extrusion frame is also fixed with a telescopic shaft connected to the extrusion block, and the telescopic shaft is used to push the extrusion block. The corners of the extrusion frame and the extrusion block that are first extruded with the mold block are rounded.

[0016] Furthermore, there is a gap between the metal shaft passing through the ferrule and the ferrule.

[0017] Furthermore, the injection molding part also includes a support frame fixed at the lower end of the support frame, the support frame has an injection molding structure inside, the support frame is provided with a frame opening at the lower end, the inner wall of the frame opening has a vertical guide strip, a matching piece is slid inside the frame opening, the edge of the matching piece cooperates with the guide strip, a support spring is fixed between the upper end surface of the matching piece and the inner wall of the lower end of the frame opening, the lower end surface of the matching piece close to the two ends is inclined, an injection molding tube body is fixed in the support frame, the matching piece is penetrated by an injection molding hole from top to bottom, the lower end of the injection molding tube body is connected with the injection molding hole, the edge of the injection molding hole has a second bevel, an injection molding end is fixed to the upper end of one of the mold blocks, the upper end of the injection molding end has a first bevel, the first bevel cooperates with the second bevel, and the two are extruded.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] 1. The force borne by each mold block will be relatively dispersed, which helps to reduce the tearing force on the molded sole during the demoulding process and achieve a good sole molding effect. The two rows of mold blocks can move along the slide bar and the metal shaft, and the two rows of mold blocks are relatively limited to avoid deviation of the injection molded sole and improve the convenience of operation.

[0020] 2. Move multiple sets of mold blocks along the metal axis, first push them toward metal segment 2 and then toward metal segment 3, to ensure that the sole will not stick to the mold. Multiple sets of mold blocks are also easy to piece together, with high flexibility.

[0021] 3. When the injection mold moves along the metal axis, it can also be clamped by the extrusion blocks on both sides to ensure that the two rows of mold blocks fit each other to avoid looseness, which is convenient for subsequent processing. After the injection mold moves to the metal segment 1, the bevel 1 and the bevel 2 are also matched to ensure the injection. The injection mold can be clamped and injection can be performed during the movement process, which improves efficiency and saves operating steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a side view structural schematic diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the top view of the separation unit of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the injection mold of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the injection molding part of the present invention;

[0028] Figure 6 This is a schematic diagram of a half-section structure of a support frame of the present invention;

[0029] Figure 7 It is a schematic diagram of the local structure of the support frame of the present invention;

[0030] Figure 8 The present invention Figure 7 A is a schematic diagram of the partially enlarged structure of the middle part;

[0031] Fig. 9 It is a schematic diagram of the structure of the injection hole and the injection end of the present invention.

[0032] In the figure: 1. base; 2. sliding frame; 21. sliding rod; 22. sliding mouth; 3. injection mold; 31. mold block; 32. ferrule; 33. injection end; 331. bevel one; 4. separation unit; 41. support plate; 42. metal shaft; 421. metal segment one; 422. metal segment two; 423. metal segment three; 5. injection molding part; 51. support frame; 52. extrusion frame; 53. telescopic shaft; 54. extrusion block; 55. support frame; 551. frame mouth; 552. guide strip; 553. matching piece; 554. support spring; 555. injection tube; 556. injection hole; 557. bevel two. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 9 , the present invention provides a technical solution: if the injection pressure is insufficient, the material may not be able to completely fill the mold cavity, resulting in sticking between the sole and the mold. If the temperature is too high or the cooling time is insufficient, the material may not be completely solidified, which will also cause sticking problems. Based on this, a sole molding device is proposed, such as Figure 1 As shown, it includes a base 1, a sliding frame 2 that can slide is installed on the base 1, an injection mold 3 is installed on the sliding frame 2, an injection part 5 for injecting into the injection mold 3 is provided at the upper end of the injection mold 3, and a separation unit 4 is also installed at the upper end of the base 1. The separation unit 4 is used to separate the injection mold 3. After injection molding in the injection mold 3, the separation unit 4 moves along the separation unit 4 to separate the sole in the injection mold 3, and then moves in the reverse direction to open the injection mold 3 and take out the sole inside.

[0035] like Figure 4 As shown, in order to reduce the tearing force generated when the sole is separated, the injection mold 3 includes multiple groups of mold blocks 31, and the multiple groups of mold blocks 31 are arranged in two rows for molding the sole. The outer sides of the multiple groups of mold blocks 31 are provided with rings 32. The multiple mold blocks 31 can be separated separately, and only one group of mold blocks 31 is separated each time, which reduces the resistance and friction during demoulding, thereby reducing the risk of damage to the sole. Separating the mold blocks 31 one by one can also reduce the tearing force on the sole during demoulding;

[0036] like Figure 2 As shown, a separation unit 4 is required to guide the movement of the injection mold 3. The separation unit 4 includes two sets of metal shafts 42. The two sets of metal shafts 42 are respectively connected to the outer rings 32 of the two rows of mold blocks 31. The two rows of mold blocks 31 move along the two sets of metal shafts 42 to achieve separation.

[0037] like Figure 4 As shown, the sliding frame 2 is slidably installed on the upper end of the base 1, and the sliding frame 2 is divided into two halves. A sliding rod 21 is fixed between the two halves of the sliding frame 2. The lower ends of the multiple groups of mold blocks 31 have sliding openings 22, and the sliding rods 21 cooperate with the sliding openings 22. Two rows of mold blocks 31 are slidably installed on the sliding rods 21. One sliding rod 21 has two matching mold blocks 31, so that the symmetrical mold blocks 31 can be separated from each other and moved in translation. The mold blocks 31 in a row are also arranged to fit together to avoid the generation of gaps that may affect the molding of the sole, so that the two rows of mold blocks 31 can mold the sole.

[0038] The slide bar 21 and the slide opening 22 are both T-shaped, which are used to limit the mold block 31 so that it can only slide horizontally and can only slide along the slide bar 21, making it easy to separate and match the mold block 31 with the opposite mold block 31.

[0039] like Figure 2 As shown, the ring 32 on the outside of the mold block 31 is hingedly connected to the mold block 31, and the separation unit 4 also includes two groups of support plates 41, and the two groups of support plates 41 are fixed to the base 1, and the two groups of metal shafts 42 are fixed between the two groups of support plates 41. The two groups of metal shafts 42 are symmetrically arranged and both have bent parts. When the sliding frame 2 slides, the ring 32 slides along the metal shaft 42, so that the metal shaft 42 drives the two rows of mold blocks 31 to separate, and the support plate 41 limits the metal shaft 42.

[0040] like Figure 3 As shown, the metal shaft 42 includes a metal segment 1 421, a metal segment 2 422 and a metal segment 3 423. The outer ends of the metal segment 2 422 and the metal segment 3 423 are respectively fixed to the support plates 41 on both sides. The metal segment 1 421 is connected between the metal segment 2 422 and the metal segment 3 423. The metal segment 1 421 is sleeved with the ferrule 32.

[0041] The second metal segment 422 is located on the extension line of the first metal segment 421. The part of the second metal segment 422 close to the first metal segment 421 has a protrusion protruding outward, and the protrusion can only accommodate one mold block 31. When multiple mold blocks 31 move along the second metal segment 422, two opposite mold blocks 31 protrude outward. With the movement, the protruding mold block 31 will also be replaced by the next one, so that the mold block 31 is separated from the sole and tearing is reduced. The third metal segment 423 is parallel to the first metal segment 421. The third metal segment 423 is located on the outside of the first metal segment 421. Multiple mold blocks 31 move along the third metal segment 423, so that the multiple mold blocks 31 are separated in two rows. After the two rows of mold blocks 31 are separated, it is convenient to take out the formed sole.

[0042] The second metal segment 422 is used to separate a group of opposite mold blocks 31 in the two rows of mold blocks 31, and as the two rows of mold blocks 31 move, multiple groups of mold blocks 31 are first separated from the sole, and the third metal segment 423 is used to separate both rows of mold blocks 31 and take out the sole.

[0043] like Figure 5 As shown, the injection molding part 5 includes a support frame 51 fixed on the base 1, and two groups of symmetrical extrusion frames 52 are fixed at the lower end of the support frame 51. Extrusion blocks 54 are clamped inside the extrusion frames 52. The extrusion blocks 54 are used to push the mold block 31 on one side, so that the inside of the extrusion frame 52 is also fixed with a telescopic shaft 53 connected to the extrusion block 54. The telescopic shaft 53 is used to push the extrusion block 54. The extrusion frame 52 and the extrusion block 54 are first squeezed with the mold block 31 to form rounded corners. When the injection mold 3 moves along the separation unit 4 and moves to the lower end of the support frame 55, the extrusion blocks 54 on both sides clamp the injection mold 3 in the middle to achieve the limiting function. At the same time, the rounded edges of the extrusion blocks 54 are first squeezed with the injection mold 3, so that the injection mold 3 is gradually clamped to complete the limiting.

[0044] There is a gap between the metal shaft 42 passing through the ring 32, so that the metal shaft 42 is fixed, while the ring 32 can move inwards and outwards to a certain extent, so that the injection mold 3 can move inwards and outwards to a certain extent, ensuring that the two rows of mold blocks 31 are in a clamped state under the action of the extrusion block 54.

[0045] like Figure 6 , Figure 8 and Fig. 9As shown, the injection molding part 5 also includes a support frame 55 fixed at the lower end of the support frame 51, and the support frame 55 has an injection molding structure inside. The support frame 55 is provided with a frame opening 551 at the lower end, and the inner wall of the frame opening 551 has a vertical guide bar 552. A matching piece 553 is slidably arranged inside the frame opening 551, and the edge of the matching piece 553 matches the guide bar 552. A support spring 554 is fixed between the upper end surface of the matching piece 553 and the inner wall of the lower end of the frame opening 551. The lower end surface of the matching piece 553 near the two ends is inclined, so that the injection mold 3 can The matching piece 553 is pushed upward to squeeze the support spring 554. An injection molding tube 555 is fixed in the support frame 55. The matching piece 553 is penetrated from top to bottom with an injection molding hole 556. The lower end of the injection molding tube 555 is connected with the injection molding hole 556. The injection molding tube 555 is an injection molding pipe. The edge of the injection molding hole 556 has a second bevel 557. An injection molding end 33 is fixed at the upper end of one of the mold blocks 31. The upper end of the injection molding end 33 has a first bevel 331. The first bevel 331 cooperates with the second bevel 557, and the two are extruded.

[0046] The injection end 33 at the upper end of the moving injection mold 3 is abutted against the matching piece 553, and the matching piece 553 is pressed upward, so that there is an extrusion force between the injection end 33 and the matching piece 553, and the first bevel 331 is matched with the second bevel 557 to increase the contact area, so that the injection molding is completed. When the first bevel 331 is matched with the second bevel 557, the injection mold 3 moves, and the first bevel 331 and the second bevel 557 are staggered, which is convenient for separation.

[0047] The working principle of the present invention is as follows: the injection end 33 on the injection mold 3 is matched with the injection hole 556, thermoplastic plastic is injected into the injection mold 3, and the thermoplastic plastic is solidified in the mold block 31 to achieve the molding of the sole, wherein the specific details are as follows:

[0048] The injection mold 3 is composed of a plurality of mold blocks 31, which can be separated along the slide bar 21. The injection mold 3 is opened and closed, and the slide bar 21 is moved, and the position of the injection mold 3 is changed to realize whether it is clamped between the two groups of extrusion blocks 54 or not, thereby realizing the opening and closing of the injection mold 3, and the plurality of mold blocks 31 can be connected to the metal shaft 42 through the collar 32. During the deformation of the metal shaft 42, the mold block 31 can move along the slide bar 21 to change its position. Based on this, after the sole is formed inside the injection mold 3, the slide frame 2 is moved, and the collar 32 moves along the metal segment 42. 22 moves, causing multiple groups of mold blocks 31 to move along with it. The protrusion of the metal segment 2 422 causes one group of mold blocks 31 to move outward, while the other mold blocks 31 are still in the state of clamping the sole. As it moves, the mold blocks 31 moving outward along the slide bar 21 will change one by one, causing the mold blocks 31 at different positions to move outward in succession, reset after passing the protrusion, and then move in the opposite direction, so that the rings 32 of the multiple groups of mold blocks 31 cooperate with the metal segment 3 423. The metal segment 3 423 separates the two rows of mold blocks 31 and takes out the sole inside.

[0049] Among them, when the mold blocks 31 are passed through the protruding part of the metal segment 2 422 one by one, the two rows of mold blocks 31 limit the sole, and the mold blocks 31 that move outward one by one and reset separate the mold blocks 31 from the sole, and other positions of the sole are still limited. The force borne by each mold block 31 will be relatively dispersed, which helps to reduce the tearing force generated on the molded sole during the demolding process, so that the sole molding effect is good. Secondly, the two rows of mold blocks 31 can move along the slide bar 21 and the metal shaft 42, and the two rows of mold blocks 31 are relatively limited, so as to avoid deviation of the injection-molded sole and improve the convenience of operation.

[0050] In addition, multiple groups of mold blocks 31 are moved along the metal shaft 42, first pushed toward the metal segment 2 422 and then pushed toward the metal segment 3 423, so that the multiple groups of mold blocks 31 are first separated from the sole, and then the two rows of mold blocks 31 are opened to ensure that the sole will not stick to the mold. Multiple groups of mold blocks 31 are also easy to assemble, with high flexibility.

[0051] When the injection mold 3 moves along the metal shaft 42, it can also be clamped by the extrusion blocks 54 on both sides to ensure that the two rows of mold blocks 31 fit together to avoid looseness, which is convenient for subsequent processing. After the injection mold 3 moves to the metal segment 1 421, the injection end 33 also squeezes the matching piece 553 upward to make the matching piece 553 move upward so that there is an extrusion force between the matching piece 553 and the injection end 33. At the same time, the bevel 1 331 and the bevel 2 557 cooperate to ensure the injection molding. The injection mold 3 is clamped and injection molding can be performed during the movement process, which improves efficiency and saves operating steps.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shoe sole molding device, comprising a base (1), a sliding frame (2) being mounted on the base (1), an injection mold (3) being mounted on the sliding frame (2), an injection portion (5) being provided at the upper end of the injection mold (3) for injecting into the injection mold (3), characterized in that: A separation unit (4) is also installed at the upper end of the base (1), and the separation unit (4) is used to separate the injection mold (3); The injection mold (3) comprises a plurality of sets of mold blocks (31), the plurality of sets of mold blocks (31) being arranged in two rows and being used to mold the sole, and the outer sides of the plurality of sets of mold blocks (31) are each provided with a collar (32); The separation unit (4) comprises two groups of metal shafts (42), the two groups of metal shafts (42) are respectively sleeved with the outer rings (32) of the two rows of mold blocks (31), and the two rows of mold blocks (31) move respectively along the two groups of metal shafts (42) to achieve separation; The collar (32) on the outside of the mold block (31) is hingedly connected to the mold block (31), and the separation unit (4) further comprises two groups of support plates (41), the two groups of support plates (41) are fixed to the base (1), and the two groups of metal shafts (42) are fixed between the two groups of support plates (41). The two groups of metal shafts (42) are symmetrically arranged and both have a bent portion. When the sliding frame (2) slides, the collar (32) slides along the metal shaft (42), so that the metal shaft (42) drives the two rows of mold blocks (31) to separate; The metal shaft (42) comprises a metal segment 1 (421), a metal segment 2 (422) and a metal segment 3 (423); the outer ends of the metal segment 2 (422) and the metal segment 3 (423) are respectively fixed to the support plates (41) on both sides; the metal segment 1 (421) is connected between the metal segment 2 (422) and the metal segment 3 (423); and the metal segment 1 (421) is sleeved with the ferrule (32); The second metal segment (422) is located on the extension line of the first metal segment (421), and the portion of the second metal segment (422) close to the first metal segment (421) has a protruding portion protruding outward, and the protruding portion can only accommodate one mold block (31) therein, and the third metal segment (423) is parallel to the first metal segment (421), and the third metal segment (423) is located outside the first metal segment (421); The second metal segment (422) is used to separate a group of opposite mold blocks (31) in the two rows of mold blocks (31), and as the two rows of mold blocks (31) move, the multiple groups of mold blocks (31) are first separated from the sole, and the third metal segment (423) is used to separate both rows of mold blocks (31) to take out the sole.

2. The sole molding equipment according to claim 1, characterized in that: The sliding frame (2) is slidably mounted on the upper end of the base (1); the sliding frame (2) is divided into two halves; a sliding rod (21) is fixed between the two halves of the sliding frame (2); the lower ends of the plurality of groups of mold blocks (31) are provided with sliding openings (22); the sliding rods (21) cooperate with the sliding openings (22); two rows of mold blocks (31) are slidably mounted on the sliding rods (21); and one sliding rod (21) has two matching mold blocks (31).

3. The sole molding device according to claim 2, characterized in that: The slide bar (21) and the slide opening (22) are both T-shaped and are used to limit the mold block (31) so that it can only slide horizontally.

4. The sole molding equipment according to claim 1, characterized in that: The injection molding part (5) comprises a support frame (51) fixed on the base (1), two groups of symmetrical extrusion frames (52) are fixed at the lower end of the support frame (51), an extrusion block (54) is clamped inside the extrusion frame (52), and the extrusion block (54) is used to push the mold block (31) on one side, so that a telescopic shaft (53) connected to the extrusion block (54) is also fixed inside the extrusion frame (52), and the telescopic shaft (53) is used to push the extrusion block (54), and the corners of the extrusion frame (52) and the extrusion block (54) that are first extruded with the mold block (31) are rounded.

5. The sole molding device according to claim 4, characterized in that: A gap is formed between the metal shaft (42) passing through the ferrule (32) and the ferrule (32).

6. The sole molding device according to claim 4, characterized in that: The injection molding part (5) further comprises a support frame (55) fixed at the lower end of the support frame (51), the support frame (55) having an injection molding structure inside, a frame opening (551) being opened at the lower end of the support frame (55), an inner wall of the frame opening (551) having a vertical guide bar (552), a matching piece (553) sliding inside the frame opening (551), an edge of the matching piece (553) matching with the guide bar (552), a support spring (554) being fixed between the upper end surface of the matching piece (553) and the inner wall of the lower end of the frame opening (551), and the matching piece (55 3) The lower end surface is arranged in an inclined surface near the two ends, an injection molding tube body (555) is fixed in the support frame (55), an injection molding hole (556) is penetrated from top to bottom in the matching piece (553), the lower end of the injection molding tube body (555) is connected with the injection molding hole (556), and the edge of the injection molding hole (556) has a second bevel (557), an injection molding end (33) is fixed at the upper end of one of the mold blocks (31), and the upper end of the injection molding end (33) has a first bevel (331), and the first bevel (331) cooperates with the second bevel (557), and the two are arranged in an extruded manner.

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