Volume-variable mold for popcorn sole forming and forming assembly line and method

Abstract

A popcorn sole forming assembly line relates to the field of footwear manufacturing equipment and comprises a volume-variable mold for forming a popcorn sole, and compact textures on the surface of the sole are formed through a left compression mechanism, a right compression mechanism, a longitudinal compression mechanism and a heating mechanism which are arranged in a female mold containing cavity. The male mold and the female mold are closed to complete first-time injection molding, popcorn particles overflow out of the containing cavity to be formed among the left compression mechanism, the right compression mechanism and the protruding block, a large shoe sole is formed, and then the heating mechanism is used for heating and driving all the components to move in the direction close to the containing cavity so as to compress the shoe sole to complete second-time molding. The sole is blown out of the mold and falls on the conveying belt below in a blowing mode after the mold is opened, compact textures can be formed on the surface of the sole formed through the method, injection molding of the sole and formation of the compact textures can be completed through one-time processing, cost is greatly saved, the structure conforms to assembly line configuration, and production efficiency is greatly improved.

Description

[0001] A variable volume mold, forming line and method for forming popcorn soles Technical Field

[0002] The invention belongs to the field of footwear production equipment, and in particular relates to a variable volume mold, an assembly line and a method for forming a popcorn sole. Background Art

[0003] ETPU is a type of TPU material formed by supercritical foaming. Because its appearance resembles popcorn, the sports shoe midsole made of ETPU is called popcorn midsole. It has the advantages of excellent resilience, extremely low compression permanent deformation, good wearing experience, and environmentally friendly and efficient processing.

[0004] After the existing popcorn soles are produced, a granular texture will appear on the surface. Similar textures bring aesthetic fatigue to consumers, and the granular dark patterns also have a certain adverse effect on the appearance design of the shoe body. Therefore, there is a practical need in the industry to eliminate the granular dark patterns on the surface of popcorn soles. Among them, the existing solution is to open a dense texture on the inner wall of the mold, and to cover the granular texture on the surface of the sole by forming a dense concave-convex texture until it cannot be recognized by the naked eye. However, the cost of making a mold with a dense texture is relatively high. The technical solution of this application aims to form a concave-convex texture on the surface of the sole that can cover the granular texture by other means. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a variable volume mold, a molding line and a method for molding a popcorn sole.

[0006] The present invention adopts the following technical solution: A variable volume mold for forming a popcorn sole, comprising a female mold, a male mold, a left compression mechanism, a right compression mechanism, a longitudinal compression mechanism and a heating mechanism. The female mold is formed with a plurality of accommodating cavities, and the bottom of the accommodating cavity is formed with a through hole connected to the other side and through which popcorn particles can be introduced into the accommodating cavity, and a plurality of vent holes for inward ventilation; The male mold is formed with a plurality of protrusions corresponding to the accommodating cavities one by one, the protrusions can extend into the accommodating cavities, the sole is foamed and formed between the protrusions and the accommodating cavities, and the protrusions are formed with a plurality of exhaust holes for exhausting air; A sliding groove is formed in the mother mold and passes through each accommodating cavity in the vertical direction. The width of the sliding groove is consistent with the thickness of the desired molded sole. The left compression mechanism is arranged on the left side of the accommodating cavity for left-right movement, and the right compression mechanism is arranged on the right side of the accommodating cavity. The left compression mechanism and the right compression mechanism can move in opposite or opposite directions to move away from or close to the accommodating cavity to circumferentially compress the sole therein. The longitudinal compression mechanism is arranged on the male mold and connected to the protrusion to drive the protrusion to move further into the accommodating cavity to compress the space of the accommodating cavity; The heating mechanism is connected with the left compression mechanism, the right compression mechanism and the longitudinal compression mechanism to heat the surface of the sole to complete the compression.

[0007] Preferably, the accommodating cavities are arranged in a matrix on the mother mold, and the left compression mechanism includes a first transverse extension rod, a first longitudinal extension rod, a first special-shaped block and a first hydraulic cylinder, wherein the first transverse extension rod is horizontally arranged above the mother mold; a plurality of first longitudinal extension rods are provided, which correspond one-to-one to each column of the accommodating cavities and extend downward from under the first transverse extension rod and extend into the sliding groove; the first special-shaped block corresponds one-to-one to each row of the accommodating cavities and is arranged on the right side of the first longitudinal extension rod, and its right side surface is formed with an arc surface with the same contour as the left side of the accommodating cavity; the first hydraulic cylinder is connected to the first transverse extension rod and drives it to move left and right, so as to drive the first special-shaped block to approach or move away from the accommodating cavity.

[0008] Preferably, the right compression mechanism includes a second transverse extension rod, a second longitudinal extension rod, a second special-shaped block and a second hydraulic cylinder, the second transverse extension rod is horizontally arranged below the mother mold; a plurality of second longitudinal extension rods are provided, which correspond one-to-one to each column of the accommodating cavity and extend upward from the second transverse extension rod and extend into the sliding groove; the second special-shaped block is arranged on the left side of the second longitudinal extension rod in a one-to-one correspondence with each row of the accommodating cavity, and its left side surface is formed with an arc surface with the same contour as the right side of the accommodating cavity; the second hydraulic cylinder is connected to the second transverse extension rod and drives it to move left and right to drive the first special-shaped block to approach or move away from the accommodating cavity, and the first special-shaped block and the second special-shaped block move toward each other so that the ends of the two are fitted together to form a space with the same shape as the accommodating cavity.

[0009] Preferably, the sliding groove is further provided with baffles located on the top and bottom surfaces of the accommodating cavity respectively, the first special-shaped block and the second special-shaped block are movably arranged between the two baffles, and the baffles seal the gap between the ends of the first special-shaped block and the second special-shaped block.

[0010] Preferably, a first guide block is provided on the top surface of the mother mold, and a first guide groove is provided on the first guide block for guiding the movement of the first transverse extension rod; a second guide block may be provided on the bottom surface of the mother mold, and a second guide groove is provided on the second guide block for guiding the movement of the second transverse extension rod.

[0011] Preferably, the male mold includes a base, a mold base and a mold-closing cylinder, the base is fixedly arranged at a position opposite to the female mold; the mold base is movably arranged on the base and parallel to the female mold, and the protrusion is arranged on the mold base; the mold-closing cylinder is arranged on the base, and its piston rod is connected to the mold base to push it away from or close to and fit the female mold.

[0012] Preferably, the longitudinal compression mechanism includes a movable hole and a compression cylinder, the movable hole is formed on the mold base to allow the protrusion to move; the compression cylinder is arranged on the base, the stroke of the compression cylinder is greater than the stroke of the clamping cylinder, its piston rod passes through the movable hole and is connected to the protrusion, and the compression cylinder can be further extended to compress the sole after the clamping cylinder pushes the mold base to close the mold.

[0013] Preferably, the heating mechanism is respectively connected to the protruding block, the first special-shaped block and the second special-shaped block to heat them.

[0014] A sole foaming molding production line, based on a variable volume mold for forming popcorn soles as described in any of the above items, also includes a conveyor belt, and a plurality of variable volume molds are evenly spaced above the conveyor belt. After foaming molding, air is ventilated into the vent holes to blow the sole from the accommodating cavity onto the conveyor belt.

[0015] A sole foaming molding method, based on the above-mentioned sole foaming molding production line, comprises: (1) Before mold closing, the first hydraulic cylinder drives the first transverse extension rod to move to the left, driving the first special-shaped block to move away from the accommodating cavity in the sliding groove, and the second hydraulic cylinder drives the second transverse extension rod to move to the right, driving the second special-shaped block to move away from the accommodating cavity in the sliding groove. The first special-shaped block, the second special-shaped block and the baffle form a space in the sliding groove that is larger than the contour of the accommodating cavity; (2) Mold closing: the mold closing cylinder pushes the front mold gradually closer to and fits the mother mold, and the convex block enters the accommodating cavity. At this time, the compression cylinder and the mold closing cylinder extend synchronously, and the height of the space formed between the convex block and the bottom surface of the accommodating cavity is greater than the required thickness of the sole; (3) Injection molding, popcorn particles are fed into the receiving cavity through the through hole, and high-temperature steam is introduced into the vent hole to complete the primary molding; (4) Compressing the sole: the heating mechanism heats the first special-shaped block, the second special-shaped block and the protrusion to a preset temperature. The first hydraulic cylinder drives the first lateral extension rod to move rightward, driving the first special-shaped block to move rightward until its right arc surface coincides with the right side surface of the accommodating cavity. The second hydraulic cylinder drives the second lateral extension rod to move leftward, driving the second special-shaped block to move leftward until its left arc surface coincides with the left side surface of the accommodating cavity. The compression cylinder continues to extend forward, causing the protrusion to move forward so that the height of the accommodating cavity is compressed to the required sole thickness, thereby completing the secondary molding.

[0016] (5) Discharging: After injection molding, the first hydraulic cylinder, the second hydraulic cylinder, the mold clamping cylinder, and the compression cylinder are reset, and the external air supply mechanism inputs gas from the vent hole to blow the sole out of the accommodating cavity and drop it onto the conveyor belt below, which then transports the sole outward.

[0017] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects: the male mold and the female mold are combined to complete the first injection molding, and the popcorn particles overflow the accommodating cavity to be molded between the left compression mechanism, the right compression mechanism and the convex block to form a larger sole, and then the heating mechanism is used to heat and drive each component to move in the direction close to the accommodating cavity to compress the sole to complete the secondary molding. The sole molded by this method can form a dense texture on the surface, and the sole injection molding and the formation of the dense texture can be completed in one processing, which greatly saves costs and improves production efficiency. By distributing the first transverse extension rod and the second transverse extension rod up and down, and arranging a plurality of first special-shaped blocks and second special-shaped blocks corresponding to the accommodating cavities on the rod, the compression of the left and right sides of the sole is completed at the same time through an ingenious structure, and multiple soles can be formed at one time, thereby further improving production efficiency, making the layout reasonable, and reducing installation difficulty; The mold is opened after the sole is injection molded, and air is blown into the vent holes to make the sole in the accommodating cavity fall onto the conveyor belt below. This type of structural mold can be adapted to assembly line production to a great extent and can effectively improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a sole foaming molding production line of the present invention; Figure 2 The structure diagram of the master mold, the left compression mechanism and the right compression mechanism of the present invention is shown in FIG. Figure 1 ; Figure 3 The structure diagram of the master mold, the left compression mechanism and the right compression mechanism of the present invention is shown in FIG. Figure 2 ; Figure 4 The transverse cross-sectional view of the mold of the present invention is Figure 1 ; Figure 5 A longitudinal cross-sectional view of the mold of the present invention Figure 1 ; Figure 6 The transverse cross-sectional view of the mold of the present invention is Figure 2 ; Figure 7 A longitudinal cross-sectional view of the mold of the present invention Figure 2 ; Figure 8 It is a structural schematic diagram of the left compression mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the right compression mechanism of the present invention; Fig.10 for Figure 4 A partial enlarged view of the middle A; In the figure: 1-mother mold; 11-accommodating cavity; 12-through hole; 13-vent; 14-sliding groove; 15-baffle; 16-first guide block; 17-first guide groove; 18-second guide block; 19-second guide groove; 2-male mold; 21-base; 22-mold base; 23-bump; 24-mold clamping cylinder; 25-exhaust hole; 3-left compression mechanism; 31-first transverse extension rod; 32-first longitudinal extension rod; 33-first special-shaped block; 34-first hydraulic cylinder; 4-right compression mechanism; 41-second transverse extension rod; 42-second longitudinal extension rod; 43-second special-shaped block; 44-second hydraulic cylinder; 5-longitudinal compression mechanism; 51-movable hole; 52-compression cylinder; 6-heating mechanism; 7-conveyor belt.

[0019] Since there are many pipeline structures in this application, drawing all of them will affect the display of the structures in the drawings of the specification. The pipeline designs used in this application are all methods that can be directly derived by technical personnel in this specification, so all the pipelines used are hidden in the drawings. DETAILED DESCRIPTION

[0020] The present invention is further described below through specific implementation modes.

[0021] Reference Figures 1 to 10 As shown, a variable volume mold for forming a popcorn sole includes a female mold 1, a male mold 2, a left compression mechanism 3, a right compression mechanism 4, a longitudinal compression mechanism 5, and a heating mechanism 6.

[0022] The master mold 1 is formed with a plurality of accommodating cavities 11, which are arranged in a matrix on the master mold 1. The surface of the accommodating cavities 11 is formed with through holes 12 that are connected to the other side and can pass popcorn particles into the accommodating cavities 11, and a plurality of vent holes 13 for inward ventilation. The master mold 1 is formed with sliding grooves 14 that pass through the accommodating cavities 11 in the vertical direction, and the width of the sliding grooves 14 is consistent with the thickness of the desired molded sole.

[0023] The male mold 2 includes a base 21, a mold base 22, a protrusion 23 and a mold clamping cylinder 24. The base 21 is fixedly arranged at a position opposite to the female mold 1; the mold base 22 is movably arranged on the base 21 and is parallel to the female mold 1; the protrusion 23 on the mold base 22 corresponds to the accommodating cavity 11 one by one and has the same shape; the mold clamping cylinder 24 is arranged on the base 21, and its piston rod is connected to the mold base 22 to push it away from or close to and fit the female mold 1, driving the protrusion 23 to extend into the accommodating cavity 11. The sole is foamed and formed between the protrusion 23 and the accommodating cavity 11, and a plurality of exhaust holes 25 for exhausting air are formed on the protrusion 23. Specifically, the vents 13 and the exhaust holes 25 are both grille-shaped to prevent popcorn particles from escaping from the vents 13 or the exhaust holes 25 from the accommodating cavity.

[0024] The left compression mechanism 3 is arranged on the left side of the accommodating chamber 11 for left and right movement, and includes a first transverse extension rod 31, a first longitudinal extension rod 32, a first special-shaped block 33 and a first hydraulic cylinder 34. The first transverse extension rod 31 is horizontally arranged above the mother mold 1; a plurality of first longitudinal extension rods 32 are arranged, which correspond one-to-one to each column of the accommodating chamber 11 and extend downward from the bottom of the first transverse extension rod 31 and extend into the sliding groove 14; the first special-shaped block 33 is arranged on the right side of the first longitudinal extension rod 32 in a one-to-one correspondence with each row of the accommodating chamber 11, and its right side surface is formed with an arc surface with the same contour as the left side of the accommodating chamber 11; the first hydraulic cylinder 34 is connected to the first transverse extension rod 31 and drives it to move left and right, so as to drive the first special-shaped block 33 to approach or move away from the accommodating chamber 11.

[0025] The right compression mechanism 4 is arranged on the right side of the accommodating chamber 11, and the right compression mechanism 4 includes a second transverse extension rod 41, a second longitudinal extension rod 42, a second special-shaped block 43 and a second hydraulic cylinder 44. The second transverse extension rod 41 is horizontally arranged below the mother mold 1; there are a plurality of second longitudinal extension rods 42, which correspond one-to-one to each column of the accommodating chamber 11 and extend upward from the second transverse extension rod 41 and extend into the sliding groove 14; the second special-shaped block 43 is arranged on the left side of the second longitudinal extension rod 42 in a one-to-one correspondence with each row of the accommodating chamber 11, and its left side surface is formed with an arc surface with the same contour as the right side of the accommodating chamber 11; the second hydraulic cylinder 44 is connected to the second transverse extension rod 41 and drives it to move left and right, so as to drive the first special-shaped block 33 to approach or move away from the accommodating chamber 11, and the first special-shaped block 33 and the second special-shaped block 43 move toward each other so that the ends of the two are fitted together to form a space with the same shape as the accommodating chamber 11, thereby completing the compression of the side of the sole.

[0026] By distributing the first lateral extension rod 31 and the second lateral extension rod 41 up and down, and arranging a plurality of first special-shaped blocks 33 and second special-shaped blocks 43 corresponding to the accommodating cavity 11 thereon, through a clever structure and simultaneous completion of the compression of the left and right sides of the sole, and forming multiple soles at one time, the production efficiency is further improved, the layout is reasonable, and the difficulty of installation is reduced.

[0027] Specifically, baffles 15 are provided in the sliding groove 14 and are respectively located on the top and bottom surfaces of the accommodating cavity 11. The first special-shaped block 33 and the second special-shaped block 43 are movably arranged between the two baffles 15. The baffle 15 seals the gap between the ends of the first special-shaped block 33 and the second special-shaped block 43 to avoid overflow of popcorn particles.

[0028] Furthermore, the top surface of the mother mold 1 is provided with a first guide block 16, and the first guide block 16 is provided with a first guide groove 17 for guiding the movement of the first transverse extension rod 31; the bottom surface of the mother mold 1 can be provided with a second guide block 18, and the second guide block is provided with a second guide groove 19 for guiding the movement of the second transverse extension rod 41, which can effectively guide the horizontal movement of the first transverse extension rod 31 and the second transverse extension rod 41 to avoid the tilt caused by its own gravity and affect the sole molding. Among them, due to the particularity of the structure of the right compression mechanism 4, the second guide block 18 adopts a detachable structure. When installing, the second longitudinal extension rod 42 should be extended into the sliding groove 14 first, and then the second guide block 18 should be installed at the specified position of the mother mold 1, and finally the second transverse extension rod 41 should be placed in the second guide groove 19 to achieve the function of guiding it. In special cases (the extension rod is too long), two first hydraulic cylinders 34 and second hydraulic cylinders 44 can be respectively provided at both ends of the first transverse extension rod 31 and the second transverse extension rod 41 to synchronously drive the first transverse extension rod 31 and the second extension rod to move.

[0029] The longitudinal compression mechanism 5 is arranged on the male mold 2 and connected to the protrusion 23 to drive the protrusion 23 to move further into the accommodating cavity 11 to compress the space of the accommodating cavity 11. The longitudinal compression mechanism 5 includes a movable hole 51 and a compression cylinder 52. The movable hole 51 is formed on the mold base 22 to allow the protrusion 23 to move; the compression cylinder 52 is arranged on the base 21, and the stroke of the compression cylinder 52 is greater than the stroke of the mold clamping cylinder 24. Its piston rod passes through the movable hole 51 and is connected to the protrusion 23. The compression cylinder 52 can be further extended to compress the sole after the mold clamping cylinder 24 pushes the mold base 22 to close the mold.

[0030] The heating mechanism 6 is respectively connected to the protruding block 23, the first special-shaped block 33 and the second special-shaped block 43 and heats them. The heating mechanism 6 is a common resistance wire heater, and its heating end is built-in on the surface of the first special-shaped block 33, the second special-shaped block 43 and the protruding block 23. Since it is a built-in structure and a technical solution that can be obtained by those skilled in the art, its structure and selection will not be further described here.

[0031] A sole foaming molding production line (such as the attached Figure 1 As shown), it includes the above-mentioned variable volume mold for forming popcorn soles, and also includes a conveyor belt 7. Several variable volume molds are evenly spaced above the conveyor belt 7. After foaming and molding, air is ventilated into the vent holes 13 to blow the soles from the accommodating cavity 11 onto the conveyor belt 7. This type of structural mold is highly compatible with assembly line production and can greatly improve production efficiency.

[0032] A sole foaming molding method: (1) Before mold closing, the first hydraulic cylinder 34 drives the first transverse extension rod 31 to move leftward, driving the first special-shaped block 33 in the sliding groove 14 away from the accommodating cavity 11, and the second hydraulic cylinder 44 drives the second transverse extension rod 41 to move rightward, driving the second special-shaped block 43 in the sliding groove 14 away from the accommodating cavity 11, and the first special-shaped block 33, the second special-shaped block 43 and the baffle 15 form a space in the sliding groove 14 that is larger than the outline of the accommodating cavity 11; (2) Mold closing: the mold closing cylinder 24 pushes the front mold to gradually approach and fit the mother mold 1, and the protrusion 23 enters the accommodating cavity 11. At this time, the compression cylinder 52 and the mold closing cylinder 24 extend synchronously, and the height of the space formed between the protrusion 23 and the bottom surface of the accommodating cavity 11 is greater than the required thickness of the sole; (3) Injection molding: popcorn grains are introduced into the receiving cavity 11 through the through hole 12, and high-temperature steam is introduced into the vent hole 13. The high-temperature steam enters the receiving cavity 11 through the vent hole 13 and is discharged from the exhaust hole 25. The popcorn grains are molded once under the action of the high-temperature steam. (4) Compressing the sole: the heating mechanism 6 heats the first special-shaped block 33, the second special-shaped block 43 and the protrusion 23 to a preset temperature. The first hydraulic cylinder 34 drives the first transverse extension rod 31 to move rightward, driving the first special-shaped block 33 to move rightward until its right side arc surface coincides with the right side surface of the accommodating cavity 11. The second hydraulic cylinder 44 drives the second transverse extension rod 41 to move leftward, driving the second special-shaped block 43 to move leftward until its left side arc surface coincides with the left side surface of the accommodating cavity 11. The compression cylinder 52 continues to extend forward, causing the protrusion 23 to move forward so that the height of the accommodating cavity 11 is compressed to the desired sole thickness, thereby completing the secondary molding.

[0033] (5) Discharging: After injection molding, the first hydraulic cylinder 34, the second hydraulic cylinder 44, the mold clamping cylinder 24, and the compression cylinder 52 are reset, and the external air supply mechanism inputs gas from the vent 13 to blow the sole out of the accommodating cavity 11 and onto the conveyor belt 7 below, and the conveyor belt 7 transports the sole outward.

[0034] The male mold 2 and the female mold 1 are combined to complete the first injection molding, and the popcorn particles overflow the accommodating cavity 11 and are formed between the left compression mechanism 3, the right compression mechanism 4 and the protrusion 23 to form a larger sole, and then the heating mechanism 6 heats and drives each component to move in a direction close to the accommodating cavity 11 to compress the sole to complete the secondary molding. The sole molded by this method can form a dense texture on the surface, and the injection molding of the sole and the formation of a dense texture can be completed in one processing, which greatly saves costs and improves production efficiency.

[0035] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A variable volume mold for forming a popcorn sole, characterized in that: It includes a female mold, a male mold, a left compression mechanism, a right compression mechanism, a longitudinal compression mechanism and a heating mechanism. The female mold is formed with a plurality of accommodating cavities, and the bottom of the accommodating cavity is formed with a through hole connected to the other side and through which popcorn particles can be introduced into the accommodating cavity, and a plurality of vent holes for inward ventilation; The male mold is formed with a plurality of protrusions corresponding to the accommodating cavities one by one, the protrusions can extend into the accommodating cavities, the sole is foamed and formed between the protrusions and the accommodating cavities, and the protrusions are formed with a plurality of exhaust holes for exhausting air; A sliding groove is formed in the mother mold and passes through each accommodating cavity in the vertical direction. The width of the sliding groove is consistent with the thickness of the desired molded sole. The left compression mechanism is arranged on the left side of the accommodating cavity for left-right movement, and the right compression mechanism is arranged on the right side of the accommodating cavity. The left compression mechanism and the right compression mechanism can move in opposite or opposite directions to move away from or close to the accommodating cavity to circumferentially compress the sole therein. The longitudinal compression mechanism is arranged on the male mold and connected to the protrusion to drive the protrusion to move further into the accommodating cavity to compress the space of the accommodating cavity; The heating mechanism is connected with the left compression mechanism, the right compression mechanism and the longitudinal compression mechanism to heat the surface of the sole to complete the compression.

2. The variable volume mold for forming a popcorn sole according to claim 1, characterized in that: The accommodating cavities are arranged in a matrix on the mother mold, and the left compression mechanism includes a first transverse extension rod, a first longitudinal extension rod, a first special-shaped block and a first hydraulic cylinder. The first transverse extension rod is horizontally arranged above the mother mold; a plurality of first longitudinal extension rods are provided, which correspond one-to-one to each column of the accommodating cavities and extend downward from the bottom of the first transverse extension rod and extend into the sliding groove; the first special-shaped block is arranged on the right side of the first longitudinal extension rod in a one-to-one correspondence with each row of the accommodating cavities, and its right side surface is formed with an arc surface with the same contour as the left side of the accommodating cavity; the first hydraulic cylinder is connected to the first transverse extension rod and drives it to move left and right, so as to drive the first special-shaped block to approach or move away from the accommodating cavity.

3. The variable volume mold for forming a popcorn sole according to claim 2, characterized in that: The right compression mechanism includes a second transverse extension rod, a second longitudinal extension rod, a second special-shaped block and a second hydraulic cylinder. The second transverse extension rod is horizontally arranged below the mother mold; a plurality of second longitudinal extension rods are provided, which correspond one-to-one to each column of the accommodating cavity and extend upward from the second transverse extension rod and extend into the sliding groove; the second special-shaped block is arranged on the left side of the second longitudinal extension rod in a one-to-one correspondence with each row of the accommodating cavity, and its left side surface is formed with an arc surface with the same contour as the right side of the accommodating cavity; the second hydraulic cylinder is connected to the second transverse extension rod and drives it to move left and right to drive the first special-shaped block to approach or move away from the accommodating cavity, and the first special-shaped block and the second special-shaped block move toward each other so that the ends of the two are fitted together to form a space with the same shape as the accommodating cavity.

4. The variable volume mold for forming a popcorn sole according to claim 3, characterized in that: The sliding groove is also provided with baffles located at the top and bottom surfaces of the accommodating cavity respectively, the first special-shaped block and the second special-shaped block are movably arranged between the two baffles, and the baffles seal the gap between the ends of the first special-shaped block and the second special-shaped block.

5. The variable volume mold for forming a popcorn sole according to claim 2, characterized in that: The top surface of the mother mold is provided with a first guide block, and the first guide block is provided with a first guide groove for guiding the movement of the first transverse extension rod; the bottom surface of the mother mold may be provided with a second guide block, and the second guide block is provided with a second guide groove for guiding the movement of the second transverse extension rod.

6. The variable volume mold for forming a popcorn sole according to claim 1, characterized in that: The male mold includes a base, a mold base and a mold clamping cylinder. The base is fixedly arranged at a position opposite to the female mold; the mold base is movably arranged on the base and parallel to the female mold, and the protrusion is arranged on the mold base; the mold clamping cylinder is arranged on the base, and its piston rod is connected to the mold base to push it away from or close to and fit the female mold.

7. The variable volume mold for forming a popcorn sole according to claim 7, characterized in that: The longitudinal compression mechanism includes a movable hole and a compression cylinder. The movable hole is formed on the mold base to allow the protrusion to move. The compression cylinder is arranged on the base. The stroke of the compression cylinder is greater than the stroke of the clamping cylinder. Its piston rod passes through the movable hole and is connected to the protrusion. The compression cylinder can be further extended to compress the sole after the clamping cylinder pushes the mold base to close the mold.

8. The variable volume mold for forming a popcorn sole according to claim 3, characterized in that: The heating mechanism is respectively connected to the convex block, the first special-shaped block and the second special-shaped block to heat them.

9. A popcorn sole forming production line, characterized by: A variable volume mold for forming popcorn soles based on any one of claims 1-9 also includes a conveyor belt, and a plurality of variable volume molds are evenly spaced above the conveyor belt. After foaming and molding, air is ventilated into the vent holes to blow the soles from the accommodating cavity onto the conveyor belt.

10. A method for forming a popcorn sole, characterized in that: A sole foaming molding production line according to claim 9, comprising: (1) Before mold closing, the first hydraulic cylinder drives the first transverse extension rod to move to the left, driving the first special-shaped block to move away from the accommodating cavity in the sliding groove, and the second hydraulic cylinder drives the second transverse extension rod to move to the right, driving the second special-shaped block to move away from the accommodating cavity in the sliding groove. The first special-shaped block, the second special-shaped block and the baffle form a space in the sliding groove that is larger than the contour of the accommodating cavity; (2) Mold closing: the mold closing cylinder pushes the front mold gradually closer to and fits the mother mold, and the convex block enters the accommodating cavity. At this time, the compression cylinder and the mold closing cylinder extend synchronously, and the height of the space formed between the convex block and the bottom surface of the accommodating cavity is greater than the required thickness of the sole; (3) Injection molding, popcorn particles are fed into the receiving cavity through the through hole, and high-temperature steam is introduced into the vent hole to complete the primary molding; (4) Compressing the sole: the heating mechanism heats the first special-shaped block, the second special-shaped block and the protrusion to a preset temperature; the first hydraulic cylinder drives the first transverse extension rod to move rightward, driving the first special-shaped block to move rightward to a position where its right arc surface coincides with the right side surface of the accommodating cavity; the second hydraulic cylinder drives the second transverse extension rod to move leftward, driving the second special-shaped block to move leftward to a position where its left arc surface coincides with the left side surface of the accommodating cavity; the compression cylinder continues to extend forward, causing the protrusion to move forward so that the height of the accommodating cavity is compressed to the desired sole thickness, thereby completing secondary molding; (5) Discharging: After injection molding, the first hydraulic cylinder, the second hydraulic cylinder, the mold clamping cylinder, and the compression cylinder are reset, and the external air supply mechanism inputs gas from the vent hole to blow the sole out of the accommodating cavity and drop it onto the conveyor belt below, which then transports the sole outward.

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