Variable volume mold for forming a popcorn shoe sole, forming line and method

Abstract

The application discloses a popcorn shoe sole forming assembly line, and relates to the field of footwear manufacturing equipment, which comprises a variable-volume mold for forming a popcorn shoe sole, wherein a left compression mechanism, a right compression mechanism, a longitudinal compression mechanism and a heating mechanism are arranged in a female mold accommodating cavity to realize the forming of a dense texture on the surface of the shoe sole. A male mold is combined with the female mold to complete first injection molding, popcorn particles overflow the accommodating cavity to be formed between the left compression mechanism, the right compression mechanism and a protrusion, thereby forming a larger shoe sole, then the heating mechanism is heated and each component is driven to move along the direction close to the accommodating cavity to compress the shoe sole and complete secondary molding, then the mold is opened, the shoe sole is blown out of the mold in a blowing manner and falls on a conveying belt below, the shoe sole formed by the method can form a dense texture on the surface, the injection molding of the shoe sole and the forming of the dense texture can be completed in one processing, cost is greatly saved, the structure is consistent with the assembly line configuration, and production efficiency is greatly improved.

Description

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

[0002] This invention belongs to the field of footwear production equipment, specifically a variable volume mold, production line, and method for forming popcorn shoe soles. Background Technology

[0003] ETPU is a type of TPU material that is formed into beads through supercritical foaming. Because its shape resembles popcorn, the midsole of sports shoes made of ETPU is called popcorn midsole. It has advantages such as excellent resilience, extremely low compression permanent deformation, good wearing experience, and environmentally friendly and efficient processing.

[0004] Existing popcorn-patterned shoe soles, after production, exhibit a granular texture on the surface. This similar texture leads to consumer fatigue, and the subtle granular pattern also negatively impacts the shoe's overall design. Therefore, there is a real need within the industry to eliminate the granular texture on the popcorn-patterned shoe sole surface. Current solutions involve creating a dense texture on the inner wall of the mold, covering the granular texture on the sole surface to the point that it is no longer visible to the naked eye. However, the molds used to create this dense texture are expensive. The purpose of this application is to create a textured surface on the sole that can cover the granular texture through other methods. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a variable volume mold, molding production line and method for forming popcorn shoe soles.

[0006] The present invention adopts the following technical solution:

[0007] A variable-volume mold for forming popcorn shoe soles includes a female mold, a male mold, a left compression mechanism, a right compression mechanism, a longitudinal compression mechanism, and a heating mechanism.

[0008] The master mold has several receiving cavities formed on it. The bottom of each receiving cavity has a through hole that communicates with the other side and allows popcorn kernels to be introduced into the receiving cavity, as well as several vent holes for air to pass through.

[0009] The male mold has several protrusions that correspond one-to-one with the receiving cavity. The protrusions can extend into the receiving cavity. The shoe sole is foamed between the protrusions and the receiving cavity. The protrusions have several vent holes for venting air.

[0010] The female mold is formed with sliding grooves penetrating through each accommodating cavity in the vertical direction, the width of the sliding grooves is consistent with the thickness of the required molded sole, the left compression mechanism is arranged on the left side of the accommodating cavity, the right compression mechanism is arranged on the right side of the accommodating cavity, and the left compression mechanism and the right compression mechanism can move in opposite or same directions to move away from or close to the accommodating cavity to compress the sole in the accommodating cavity in the circumferential direction;

[0011] The longitudinal compression mechanism is arranged on the male mold and connected with the protrusion to drive the protrusion to further move into the accommodating cavity to compress the space of the accommodating cavity.

[0012] 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.

[0013] Preferably, the accommodating cavity matrix is arranged on the female mold, the left compression mechanism comprises a first transverse extension rod, a first longitudinal extension rod, a first special-shaped block and a first hydraulic oil cylinder, the first transverse extension rod is horizontally arranged above the female mold; the first longitudinal extension rod is provided with a plurality of first longitudinal extension rods corresponding to each column of the accommodating cavity and extending downward from the first transverse extension rod and extending into the sliding groove; the first special-shaped block is arranged on the right side of the first longitudinal extension rod corresponding to each row of the accommodating cavity, and the right side surface thereof is formed with an arc surface with the same profile as the left side of the accommodating cavity; and the first hydraulic oil cylinder is connected with the first transverse extension rod and drives the first transverse extension rod to move left and right, so as to drive the first special-shaped block to move close to or away from the accommodating cavity.

[0014] Preferably, the right compression mechanism comprises a second transverse extension rod, a second longitudinal extension rod, a second special-shaped block and a second hydraulic oil cylinder, the second transverse extension rod is horizontally arranged below the female mold; the second longitudinal extension rod is provided with a plurality of second longitudinal extension rods corresponding to each column of the accommodating cavity and extending upward from the second transverse extension rod and extending into the sliding groove; the second special-shaped block is arranged on the left side of the second longitudinal extension rod corresponding to each row of the accommodating cavity, and the left side surface thereof is formed with an arc surface with the same profile as the right side of the accommodating cavity; and the second hydraulic oil cylinder is connected with the second transverse extension rod and drives the second transverse extension rod to move left and right, so as to drive the first special-shaped block to move close to or away from the accommodating cavity, and the first special-shaped block and the second special-shaped block move towards each other to make the end portions thereof fit to form a space with the same shape as the accommodating cavity.

[0015] Preferably, the sliding groove is further provided with baffles located on the top surface and the bottom surface of the accommodating cavity respectively, and 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 end portions of the first special-shaped block and the second special-shaped block.

[0016] Preferably, the top surface of the female 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; and the bottom surface of the female mold can 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.

[0017] Preferably, the male mold comprises a base, a mold seat and a mold closing cylinder, the base is fixedly arranged at a position opposite to the female mold; the mold seat is movably arranged on the base and is parallel to the female mold, the protruding block is arranged on the mold seat; the mold closing cylinder is arranged on the base, the piston rod of the mold closing cylinder is connected with the mold seat and can push the mold seat away from or close to the female mold.

[0018] Preferably, the longitudinal compression mechanism comprises a movable hole and a compression cylinder, the movable hole is formed in the mold seat and can be used by the protruding block; the compression cylinder is arranged on the base, the stroke of the compression cylinder is greater than the stroke of the mold closing cylinder, the piston rod of the compression cylinder is connected with the protruding block through the movable hole, and the compression cylinder can be further elongated after the mold closing cylinder pushes the mold seat to close the mold to compress the sole.

[0019] Preferably, the heating mechanism is connected with and heats the protruding block, the first special-shaped block and the second special-shaped block respectively.

[0020] A sole foaming forming assembly line based on the variable volume mold for forming a popcorn sole according to any one of the above, further comprising a conveying belt, a plurality of variable volume molds are uniformly and spacedly arranged above the conveying belt, and the sole is blown off from the containing cavity into the conveying belt after being foamed and formed and being ventilated into the ventilation hole.

[0021] A sole foaming forming method based on the sole foaming forming assembly line according to the above, comprising:

[0022] (1) Before closing the mold, the first hydraulic cylinder drives the first transverse extension rod to move left, drives the first special-shaped block to move away from the containing cavity in the sliding groove, the second hydraulic cylinder drives the second transverse extension rod to move right, drives the second special-shaped block to move away from the containing cavity in the sliding groove, and the first special-shaped block, the second special-shaped block and the baffle form a space larger than the profile of the containing cavity in the sliding groove;

[0023] (2) Closing the mold, the mold closing cylinder pushes the front mold to gradually close and fit the female mold, the protruding block enters the containing cavity at the same time, the compression cylinder is elongated synchronously with the mold closing cylinder, and the height of the space between the protruding block and the bottom surface of the containing cavity is greater than the thickness of the required sole;

[0024] (3) Injection molding, popcorn particles are input into the containing cavity from the through hole, and high-temperature steam is ventilated into the ventilation hole to complete one forming;

[0025] (4) compress the shoe sole, the heating mechanism heats the first special-shaped block, the second special-shaped block and the convex block to a preset temperature, the first hydraulic oil cylinder drives the first transverse extension rod to move right, drives the first special-shaped block to move right to a position where the right side arc surface of the first special-shaped block coincides with the right side surface of the accommodating cavity, the second hydraulic oil cylinder drives the second transverse extension rod to move left, drives the second special-shaped block to move left to a position where the left side arc surface of the second special-shaped block coincides with the left side surface of the accommodating cavity, the compression oil cylinder continues to stretch forward, the convex block moves forward, the height of the accommodating cavity is compressed to the required thickness of the shoe sole, and the secondary forming is completed.

[0026] (5) discharging, after injection molding, the first hydraulic oil cylinder, the second hydraulic oil cylinder, the mold closing oil cylinder and the compression oil cylinder are reset respectively, gas is input from the air hole by the external gas conveying mechanism, the shoe sole is blown out of the accommodating cavity and falls on the conveying belt below, and the shoe sole is conveyed outward by the conveying belt.

[0027] From the description of the application, compared with the prior art, the beneficial effects of the application are that: the mold and the mold are closed to complete the first injection molding, the popcorn particles overflow the accommodating cavity and are formed between the left compression mechanism and the right compression mechanism and the convex block, forming a larger shoe sole, then heating the heating mechanism and driving each part to move in the direction close to the accommodating cavity to compress the shoe sole to complete the secondary forming, the shoe sole formed by this method can form a dense texture on the surface, the injection molding of the shoe sole and the formation of the dense texture can be completed at one time, which greatly saves the cost and improves the production efficiency;

[0028] By arranging the first transverse extension rod and the second transverse extension rod in an up-down distribution mode and arranging a plurality of first special-shaped blocks and second special-shaped blocks corresponding to the accommodating cavity on the first transverse extension rod and the second transverse extension rod, the left side and the right side of the shoe sole are compressed at the same time through the ingenious structure, and a plurality of shoe soles can be formed at one time, thereby further improving the production efficiency, the layout is reasonable, and the installation difficulty is reduced;

[0029] After the mold is opened after the injection molding of the shoe sole, gas is blown into the air hole, and the shoe sole in the accommodating cavity falls into the conveying belt below. The mold structure can greatly adapt to the assembly line production, and the production efficiency can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure diagram of the shoe sole foaming forming assembly line of the application;

[0031] Figure 2 It is a structure diagram of the mold, the left compression mechanism and the right compression mechanism of the application Figure 1 ;

[0032] Figure 3 It is a structure diagram of the mold, the left compression mechanism and the right compression mechanism of the application Figure 2 ;

[0033] Figure 4 A transverse sectional view of the mold clamping of the present application Figure 1 ;

[0034] Figure 5 A longitudinal sectional view of the mold clamping of the present application Figure 1 ;

[0035] Figure 6 A transverse sectional view of the mold clamping of the present application Figure 2 ;

[0036] Figure 7 A longitudinal sectional view of the mold clamping of the present application Figure 2 ;

[0037] Figure 8 A structure schematic view of the left compression mechanism of the present application

[0038] Figure 9 A structure schematic view of the right compression mechanism of the present application

[0039] Figure 10 A Figure 4 partial enlarged view of A in the middle

[0040] In the figure: 1-male mold; 11-housing cavity; 12-through hole; 13-vent hole; 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 oil cylinder; 25-vent hole; 3-left compression mechanism; 31-first transverse extension rod; 32-first longitudinal extension rod; 33-first special-shaped block; 34-first hydraulic oil cylinder; 4-right compression mechanism; 41-second transverse extension rod; 42-second longitudinal extension rod; 43-second special-shaped block; 44-second hydraulic oil cylinder; 5-longitudinal compression mechanism; 51-moving hole; 52-compression oil cylinder; 6-heating mechanism; 7-conveying belt.

[0041] Due to the fact that there are many pipeline structures in the present application, all of which will affect the display of the structure in the drawings of the specification, the pipeline design used in the present application is a way that can be directly obtained by those skilled in the art through the present specification, so all the pipelines used in the drawings are hidden. DETAILED DESCRIPTION

[0042] The present application will be further described below through specific embodiments.

[0043] Referring to Figures 1 to 10 the figure, a variable volume mold for forming a popcorn shoe 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.

[0044] The plurality of accommodating cavities 11 are arranged on the female mold 1 in a matrix, and the accommodating cavities 11 are provided with a plurality of through holes 12 and a plurality of air holes 13 on the side surface. The through holes 12 are communicated with the other side and can be used to pour the popcorn particles into the accommodating cavities 11. The air holes 13 are used to ventilate the accommodating cavities 11. The female mold 1 is provided with a plurality of sliding grooves 14 which are vertically arranged through the accommodating cavities 11. The width of the sliding grooves 14 is consistent with the thickness of the required shoe sole.

[0045] The male mold 2 comprises a base 21, a mold seat 22, a protrusion 23 and a mold closing oil cylinder 24. The base 21 is fixedly arranged at a position opposite to the female mold 1. The mold seat 22 is movably arranged on the base 21 and is parallel to the female mold 1. The protrusions 23 are arranged on the mold seat 22 and correspond to the accommodating cavities 11. The mold closing oil cylinder 24 is arranged on the base 21. The piston rod of the mold closing oil cylinder 24 is connected with the mold seat 22 and can push the mold seat 22 away from or close to the female mold 1, so as to drive the protrusions 23 to extend into the accommodating cavities 11. The shoe sole is foamed and formed between the protrusions 23 and the accommodating cavities 11. The protrusions 23 are provided with a plurality of air exhaust holes 25. Specifically, the air holes 13 and the air exhaust holes 25 are both designed as grating type, so as to avoid the popcorn particles from escaping from the air holes 13 or the air exhaust holes 25.

[0046] The left compression mechanism 3 is arranged on the left side of the accommodating cavities 11 and comprises a first horizontal extension rod 31, a first vertical extension rod 32, a first special-shaped block 33 and a first hydraulic oil cylinder 34. The first horizontal extension rod 31 is horizontally arranged above the female mold 1. The first vertical extension rod 32 is provided with a plurality of rods which correspond to the rows of the accommodating cavities 11 and extend downward from the first horizontal extension rod 31 and into the sliding grooves 14. The first special-shaped block 33 is arranged on the right side of the first vertical extension rod 32 and corresponds to the rows of the accommodating cavities 11. The right side surface of the first special-shaped block 33 is provided with an arc surface which is consistent with the left side profile of the accommodating cavities 11. The first hydraulic oil cylinder 34 is connected with the first horizontal extension rod 31 and drives the first horizontal extension rod 31 to move leftward or rightward, so as to drive the first special-shaped block 33 to move close to or away from the accommodating cavities 11.

[0047] The right compression mechanism 4 is arranged on the right side of the accommodating cavities 11 and comprises a second horizontal extension rod 41, a second vertical extension rod 42, a second special-shaped block 43 and a second hydraulic oil cylinder 44. The second horizontal extension rod 41 is horizontally arranged below the female mold 1. The second vertical extension rod 42 is provided with a plurality of rods which correspond to the rows of the accommodating cavities 11 and extend upward from the second horizontal extension rod 41 and into the sliding grooves 14. The second special-shaped block 43 is arranged on the left side of the second vertical extension rod 42 and corresponds to the rows of the accommodating cavities 11. The left side surface of the second special-shaped block 43 is provided with an arc surface which is consistent with the right side profile of the accommodating cavities 11. The second hydraulic oil cylinder 44 is connected with the second horizontal extension rod 41 and drives the second horizontal extension rod 41 to move leftward or rightward, so as to drive the first special-shaped block 33 to move close to or away from the accommodating cavities 11. The first special-shaped block 33 and the second special-shaped block 43 move towards each other, so that the end portions of the first special-shaped block 33 and the second special-shaped block 43 are close to each other and form a space which is consistent with the shape of the accommodating cavities 11, thereby completing the compression of the side surface of the shoe sole.

[0048] By distributing the first transverse extension rod 31 and the second transverse extension rod 41 in an up-down manner and arranging a plurality of first special-shaped blocks 33 and second special-shaped blocks 43 corresponding to the accommodating cavities 11, the left and right sides of the shoe sole are compressed simultaneously through the ingenious structure, and a plurality of shoe soles can be formed at one time, thereby further improving the production efficiency, reasonably arranging the layout, and reducing the installation difficulty.

[0049] Specifically, the sliding groove 14 is further provided with baffles 15 located at the top surface and the bottom surface of the accommodating cavities 11, respectively, and the first special-shaped blocks 33 and the second special-shaped blocks 43 are movably arranged between the two baffles 15. The baffle 15 seals the gap between the end portions of the first special-shaped block 33 and the second special-shaped block 43, so as to avoid causing the popcorn particles to overflow.

[0050] Further, the top surface of the female 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 female 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. The horizontal movement of the first transverse extension rod 31 and the second transverse extension rod 41 can be effectively guided, so as to avoid the inclination caused by the gravity of the first transverse extension rod 31 and the second transverse extension rod 41 from affecting the molding of the shoe sole. Since the structure of the right compression mechanism 4 is special, the second guide block 18 adopts a detachable structure. When installed, the second longitudinal extension rod 42 should be first inserted into the sliding groove 14, then the second guide block 18 is installed at the specified position of the female mold 1, and finally the second transverse extension rod 41 is placed into the second guide groove 19 to realize the guiding function. In a special case (the extension rod is too long), two first hydraulic oil cylinders 34 and two second hydraulic oil cylinders 44 can be arranged at both ends of the first transverse extension rod 31 and the second transverse extension rod 41 respectively, so as to synchronously drive the first transverse extension rod 31 and the second extension rod to move.

[0051] The longitudinal compression mechanism 5 is arranged on the male mold 2 and connected with the protrusion 23, so as to drive the protrusion 23 to further move into the accommodating cavity 11 to compress the space of the accommodating cavity 11. The longitudinal compression mechanism 5 comprises a movable hole 51 and a compression oil cylinder 52. The movable hole 51 is formed in the mold base 22 and can be used for the movement of the protrusion 23. The compression oil cylinder 52 is arranged on the base 21, and the stroke of the compression oil cylinder 52 is greater than that of the clamping oil cylinder 24. The piston rod of the compression oil cylinder 52 is connected with the protrusion 23 through the movable hole 51. After the mold base 22 is clamped by the clamping oil cylinder 24, the compression oil cylinder 52 can be further elongated to compress the shoe sole.

[0052] Heating mechanism 6 is connected to and heats protrusion 23, first irregular block 33 and second irregular block 43 respectively. Heating mechanism 6 is a common resistance wire heater, and its heating end is built into the surface of first irregular block 33, second irregular block 43 and protrusion 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 described in detail here.

[0053] A foam molding production line for shoe soles (as shown in the attached document) Figure 1 As shown, the variable volume mold for forming popcorn shoe soles includes a conveyor belt 7. Several variable volume molds are evenly spaced above the conveyor belt 7. After foaming and molding, air is introduced into the ventilation holes 13 to blow the shoe soles from the receiving cavity 11 onto the conveyor belt 7. This type of mold structure is highly compatible with assembly line production and can greatly improve production efficiency.

[0054] A method for foam molding of shoe soles:

[0055] (1) Before the mold is closed, the first hydraulic cylinder 34 drives the first transverse extension rod 31 to move to the left, causing the first irregular block 33 to move away from the receiving cavity 11 in the sliding groove 14. The second hydraulic cylinder 44 drives the second transverse extension rod 41 to move to the right, causing the second irregular block 43 to move away from the receiving cavity 11 in the sliding groove 14. The first irregular block 33, the second irregular block 43 and the baffle 15 form a space in the sliding groove 14 that is larger than the outline of the receiving cavity 11.

[0056] (2) Mold closing: The mold closing cylinder 24 pushes the front mold to gradually approach and fit against the mother mold 1, and the protrusion 23 enters the receiving 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 receiving cavity 11 is greater than the required thickness of the shoe sole.

[0057] (3) Injection molding: Popcorn pellets are fed 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 pellets are formed in one step under the action of high-temperature steam.

[0058] (4) Compress the sole. The heating mechanism 6 heats the first irregular block 33, the second irregular block 43 and the protrusion 23 to the preset temperature. The first hydraulic cylinder 34 drives the first transverse extension rod 31 to move to the right, which in turn moves the first irregular block 33 to the right until its right arc surface coincides with the right side of the receiving cavity 11. The second hydraulic cylinder 44 drives the second transverse extension rod 41 to move to the left, which in turn moves the second irregular block 43 to the left until its left arc surface coincides with the left side of the receiving cavity 11. The compression cylinder 52 continues to extend forward, which moves the protrusion 23 forward and compresses the receiving cavity 11 to the required sole thickness, thus completing the secondary molding.

[0059] (5) Discharge, after injection molding, the first hydraulic cylinder 34, the second hydraulic cylinder 44, the mold oil cylinder 24, the compression cylinder 52 reset, by the external gas from the vent hole 13 input gas, the sole cavity 11 and fall in the lower part of the conveying belt 7, by the conveying belt 7 to the outside of the sole conveying.

[0060] The public mold 2 and the female mold 1 are combined to complete the first injection molding, and the popcorn particles overflow the cavity 11 to be formed between the left compression mechanism 3 and the right compression mechanism 4 and the protrusion 23, forming a larger sole, and then heated by the heating mechanism 6 and driven to move in the direction of approaching the cavity 11 to compress the sole to complete the second molding. The sole formed by this method can form a dense texture on the surface. The injection molding of the sole and the formation of the dense texture can be completed in one process, greatly saving the cost and improving the production efficiency.

[0061] The above is only a preferred embodiment of the present application, and therefore cannot limit the scope of the present application. Any equivalent changes and modifications made in accordance with the scope of the present application and the content of the specification shall still be within the scope of the present application.

Claims

1. A variable volume mold for forming a popcorn shoe sole, characterized by: The mold comprises 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 provided with a plurality of accommodating cavities, and the bottom of each accommodating cavity is provided with a through hole communicating with the other side and allowing popcorn particles to enter the accommodating cavity and a plurality of air vents for air intake; The male mold is provided with a plurality of protrusions corresponding to the accommodating cavities, the protrusions can extend into the accommodating cavities, the shoe sole is foamed between the protrusions and the accommodating cavities, and the protrusions are provided with a plurality of air vents for discharging air; The female mold is provided with a sliding groove penetrating through each accommodating cavity in the vertical direction, the thickness of the sliding groove is consistent with the thickness of the shoe sole to be formed, the left compression mechanism is arranged on the left side of the accommodating cavity, the right compression mechanism is arranged on the right side of the accommodating cavity, and the left compression mechanism and the right compression mechanism can move away from or close to the accommodating cavity in opposite directions to compress the shoe sole in the accommodating cavity in the circumferential direction; The longitudinal compression mechanism is arranged on the male mold and connected with the protrusions to drive the protrusions to further move into the accommodating cavities to compress the space of the accommodating cavities. 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 shoe sole to complete the compression.

2. A variable volume mold for forming a popcorn shoe sole according to claim 1, wherein: The accommodating cavities are arranged in a matrix on the female mold, the left compression mechanism comprises a first transverse extension rod, a first longitudinal extension rod, a first special-shaped block and a first hydraulic oil cylinder, the first transverse extension rod is horizontally arranged above the female mold, the first longitudinal extension rod is provided with a plurality of rods corresponding to each column of accommodating cavities and extending downward from the first transverse extension rod and into the sliding groove, the first special-shaped block is arranged on the right side of the first longitudinal extension rod corresponding to each row of accommodating cavities, and the right side surface of the first special-shaped block is provided with an arc surface with the same profile as the left side of the accommodating cavities, and the first hydraulic oil cylinder is connected with the first transverse extension rod and drives the first transverse extension rod to move left and right to drive the first special-shaped block to move close to or away from the accommodating cavities.

3. A variable volume mold for forming a popcorn shoe sole according to claim 2, wherein: The right compression mechanism comprises a second transverse extension rod, a second longitudinal extension rod, a second special-shaped block and a second hydraulic oil cylinder, the second transverse extension rod is horizontally arranged below the female mold, the second longitudinal extension rod is provided with a plurality of rods corresponding to each column of accommodating cavities and extending upward from the second transverse extension rod and into the sliding groove, the second special-shaped block is arranged on the left side of the second longitudinal extension rod corresponding to each row of accommodating cavities, and the left side surface of the second special-shaped block is provided with an arc surface with the same profile as the right side of the accommodating cavities, and the second hydraulic oil cylinder is connected with the second transverse extension rod and drives the second transverse extension rod to move left and right to drive the first special-shaped block to move close to or away from the accommodating cavities, and the first special-shaped block and the second special-shaped block move towards each other to make the end surfaces of the two blocks fit together to form a space with the same shape as the accommodating cavities.

4. A variable volume mold for forming a popcorn shoe sole according to claim 3, wherein: The sliding groove is further provided with baffles on the top surface and the bottom surface of the accommodating cavities, 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 end surfaces of the first special-shaped block and the second special-shaped block.

5. A variable volume mold for forming a popcorn shoe sole according to claim 3, wherein: The top surface of the female mold is provided with a first guide block, the first guide block is provided with a first guide groove for guiding the movement of the first transverse extension rod, and the bottom surface of the female mold is provided with a second guide block, the second guide block is provided with a second guide groove for guiding the movement of the second transverse extension rod.

6. A variable volume mold for forming a popcorn shoe sole according to claim 1, wherein: The male mold comprises 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 is parallel to the female mold, the protruding block is arranged on the mold base; the mold closing cylinder is arranged on the base, the piston rod of the mold closing cylinder is connected with the mold base and can push the mold base away from or close to the female mold.

7. A variable volume mold for forming a popcorn shoe sole according to claim 6, wherein: The longitudinal compression mechanism comprises a movable hole and a compression cylinder, the movable hole is formed on the mold base and can be used for the movement of the protruding block; the compression cylinder is arranged on the base, the stroke of the compression cylinder is greater than the stroke of the mold closing cylinder, the piston rod of the compression cylinder is connected with the protruding block through the movable hole, and the compression cylinder can be further elongated after the mold base is pushed by the mold closing cylinder to close the mold, so as to compress the sole.

8. A variable volume mold for forming a popcorn shoe sole according to claim 3, wherein: The heating mechanism is connected with the protruding block, the first special-shaped block and the second special-shaped block respectively and heats them.

9. A corn on the cob sole forming assembly line characterized by: The variable-volume mold for forming a popcorn sole according to any one of claims 1-8 further comprises a conveying belt, a plurality of variable-volume molds are uniformly and spacedly arranged above the conveying belt, and the sole is blown from the containing cavity into the conveying belt on the conveying belt after being foamed and formed and being ventilated into the ventilation hole.

10. A method of forming a popcorn shoe sole, characterized by: The sole foaming forming assembly line according to claim 9 comprises: Before the mold is closed, the first hydraulic cylinder drives the first transverse extension rod to move left, drives the first special-shaped block to move away from the containing cavity in the sliding groove, the second hydraulic cylinder drives the second transverse extension rod to move right, drives the second special-shaped block to move away from the containing cavity in the sliding groove, and the first special-shaped block, the second special-shaped block and the baffle form a space larger than the profile of the containing cavity in the sliding groove; When the mold is closed, the mold closing cylinder pushes the front mold to gradually close to and abut against the female mold, the protruding block enters the containing cavity, the compression cylinder is elongated synchronously with the mold closing cylinder, and the height of the space formed between the protruding block and the bottom surface of the containing cavity is greater than the thickness of the required sole; Injection molding, popcorn particles are input into the containing cavity from the through hole, and high-temperature steam is input into the ventilation hole to complete the first forming; Compression of the sole, the heating mechanism heats the first special-shaped block, the second special-shaped block and the protruding block to a preset temperature, the first hydraulic cylinder drives the first transverse extension rod to move right, drives the first special-shaped block to move right to a position where the right arc surface of the first special-shaped block coincides with the right side surface of the containing cavity, the second hydraulic cylinder drives the second transverse extension rod to move left, drives the second special-shaped block to move left to a position where the left arc surface of the second special-shaped block coincides with the left side surface of the containing cavity, the compression cylinder is continuously elongated forward, the protruding block is moved forward, the containing cavity is compressed to the required sole thickness, and the second forming is completed; Discharge, after the injection molding, the first hydraulic cylinder, the second hydraulic cylinder, the mold closing cylinder and the compression cylinder are reset respectively, the gas is input from the ventilation hole by the external gas input mechanism, the sole is blown out of the containing cavity and falls on the conveying belt below, and the sole is conveyed outward by the conveying belt.

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