Safety shoe insole injection molding equipment

Abstract

The present invention discloses an injection molding device for safety shoe insoles, comprising a machine body, a mold unit and a protective frame installed on the machine body, an injection end fixed to one side of the mold unit is arranged inside the protective frame, a material pipe extending laterally is fixed to the outside of the injection end, a delivery pipe connected to the inside of the material pipe is fixed to the upper end of the material pipe, a pushing unit for pushing molten plastic is installed inside the material pipe, a heating sleeve for heating is coated on the outside of the material pipe, and a driving part for pushing movement is arranged at the end of the material pipe. The present invention pushes the molten plastic laterally through a spiral push plate, and the molten plastic moves back from the gap between the spiral push plate and the material pipe, so that the molten plastic is relatively evenly heated, the spiral push plate and the negative pressure of the conical cavity work together to ensure that the conical cavity is filled, and the conical end moves outward to contact with more molten plastic, avoiding the generation of gaps inside the conical cavity.

Description

Technical Field

[0001] The invention relates to the technical field of insole processing, in particular to an injection molding device for safety shoe insoles. Background Art

[0002] Select the appropriate sole material, such as polyethylene, EVA polyvinyl chloride, modified polyvinyl chloride, SBS thermoplastic polyurethane, etc., place the plastic granules or block materials in the heating barrel, and heat them to melt and plasticize them. The molten plastic material needs to maintain a certain fluidity and temperature so that it can enter the mold smoothly during the injection process. Under the action of the high-pressure system of the injection machine, the molten plastic material is quickly injected into the closed mold through a screw or plunger. The mold usually has a cavity corresponding to the shape of the insole to ensure that the molded insole has the required shape and size. Finally, after the insole is cured, open the mold and take the insole out of the mold for subsequent processing.

[0003] When the molten plastic material passes through the injection machine, the molten plastic material is required to fill the entire cavity to ensure that no pores are generated when the molten plastic material is extruded into the mold. However, the fluidity of molten plastic is relatively poor. If bubbles are generated inside the molten plastic material in the injection machine, it is difficult to make the bubbles automatically move out of the molten plastic material. Even under the action of extrusion, bubbles still exist. In addition, when the molten plastic material is heated, the barrel is generally a component in the injection machine used to contain and heat the plastic material. When heated, it is heated from the outside to the inside. Therefore, the plastic in contact with the barrel is heated first, while the plastic in other positions is heated slowly. Based on this, the degree of heating of the plastic in the barrel is inconsistent, resulting in uneven heating. Therefore, the molten plastic injected into the mold will be difficult to fill the mold and will easily clog the injection hole. Summary of the invention

[0004] The object of the present invention is to provide a safety shoe insole injection molding device to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a safety shoe insole injection molding device, comprising a machine body, on which a mold unit and a protective frame are installed, an injection end fixed to one side of the mold unit is provided inside the protective frame, a laterally extending material pipe is fixed to the outside of the injection end, a delivery pipe connected to the inside of the material pipe is fixed to the upper end of the material pipe, a pushing unit for pushing molten plastic is installed inside the material pipe, the outside of the material pipe is covered with a heating jacket for heating, and a driving part for pushing movement is provided at the end of the material pipe.

[0006] Furthermore, the pushing unit includes a pushing shaft and a tapered end at the end, the tapered end is fixed at the end of the pushing shaft, the outer wall of the tapered end is fitted with the inner wall of the material tube, a pushing cavity is provided on the straight side of the tapered end, a one-way valve is installed in the pushing cavity, the outer side of the injection end has a tapered cavity matching the tapered end, the injection end is penetrated by an injection hole, the injection hole is used to connect the tapered cavity and the mold unit, a one-way valve is also installed in the injection hole, when the tapered end moves back and forth, the tapered cavity is filled with molten plastic and injected into the mold unit.

[0007] Furthermore, the injection end has a heating wire inside for maintaining the temperature of the molten plastic, and the injection end is made of metal.

[0008] Furthermore, the driving part includes a frame plate fixed in the protective frame, a support cylinder is fixed on one side of the frame plate, and the other side is fixed to the material tube, a motor for driving is fixed to the outer end of the support cylinder, a support shaft pointing to the axis of the support cylinder is fixed on the inner wall of the support cylinder, a driving shaft fixed to a push shaft is sleeved in the support cylinder, the push shaft passes through the frame plate, a spiral plate for cooperating with the support shaft is fixed on the outer wall of the drive shaft, the spiral plate is against the support shaft, and when the spiral plate rotates, it moves laterally along the support shaft;

[0009] The outer wall of the driving shaft has an anti-rotation block extending outward, and a support sleeve is fixed to the output end of the motor. The support sleeve is sleeved with the driving shaft and the anti-rotation block. A return spring supporting the driving shaft is provided in the support sleeve. When the motor drives the driving shaft to rotate, the driving shaft generates telescopic movement.

[0010] Furthermore, the spiral plate is semicircular in side view, and its outer surface is smooth.

[0011] Furthermore, a rigid spiral push plate is fixed to the straight side of the conical end. When the spiral push plate rotates, it is used to push the molten plastic. There is a gap between the edge of the spiral push plate and the material pipe.

[0012] Furthermore, a mounting ring is provided between the spiral push plate and the push shaft, an outer sleeve is sleeved in the mounting ring, and the inner and outer sides of the outer sleeve are in contact with the push shaft and the spiral push plate respectively;

[0013] A partition is fixed at the end of the outer sleeve, a through slot is opened at the lower end of the partition, and the through slot is used for molten plastic to pass through, and the upper end of the partition corresponds to the delivery pipe.

[0014] Furthermore, the push shaft is provided with a deformation port outside, and the deformation port is located at the end of the outer sleeve. When the push shaft telescopes, the deformation port changes in size.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0016] 1. The spiral push plate pushes the molten plastic laterally, and the molten plastic moves back from the gap between the spiral push plate and the material tube, which makes the molten plastic heated evenly. The spiral push plate and the negative pressure of the conical cavity work together to ensure that the conical cavity is filled. The conical end moves outward to contact with more molten plastic to avoid gaps inside the conical cavity.

[0017] 2. The push shaft reciprocates laterally, while the outer sleeve remains stationary. The spiral push plate scrapes back and forth along the outer sleeve, which to a certain extent avoids the solidification of the molten plastic between the spiral push plate and the outer sleeve, avoids local blockiness, and improves the quality of the insole to a certain extent.

[0018] 3. The plastic particles are melted inside the material tube and move from the through slot, which is filled with molten plastic to prevent gas from passing through the through slot. Under the reciprocating motion of the push shaft, the deformation port is deformed to achieve the compaction effect and avoid pores as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the protection frame of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of the material tube of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the driving part of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the pushing unit of the present invention;

[0025] Figure 6 It is a schematic diagram of the exploded structure of the pushing unit of the present invention;

[0026] Figure 7 It is a schematic diagram of the end surface structure of the push shaft and the spiral push plate of the present invention;

[0027] Figure 8 It is a schematic diagram of the outer sleeve and the partition structure of the present invention;

[0028] Fig. 9 It is a schematic diagram of the structure of the tapered end and the injection end of the present invention.

[0029] In the figure: 1. machine body; 2. mold unit; 3. protection frame; 4. material tube; 5. injection end; 51. conical cavity; 52. injection hole; 6. heating sleeve; 7. pushing unit; 71. pushing shaft; 711. mounting ring; 712. deformation port; 72. conical end; 721. pushing cavity; 722. one-way valve; 73. spiral push plate; 74. partition; 75. through groove; 76. outer sleeve; 8. delivery tube; 9. driving unit; 91. frame plate; 92. support cylinder; 93. support shaft; 94. driving shaft; 95. spiral plate; 96. anti-rotation block; 97. reset spring; 98. motor; 99. support sleeve. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-Figure 9 The present invention provides a technical solution: the injection molding process has the characteristics of high automation, which can greatly improve the production efficiency of insoles. Through precise mold design and efficient injection molding equipment, rapid and continuous production of insoles can be achieved, but there are still some problems. For this purpose, a safety shoe insole injection molding device is proposed, including a body 1, a mold unit 2 and a protective frame 3 are installed on the body 1, an injection end 5 fixed to one side of the mold unit 2 is provided inside the protective frame 3, a laterally extending material pipe 4 is fixed to the outside of the injection end 5, a delivery pipe 8 connected to the inside of the material pipe 4 is fixed to the upper end of the material pipe 4, a pushing unit 7 for pushing molten plastic is installed inside the material pipe 4, a heating sleeve 6 for heating is coated on the outside of the material pipe 4, and a driving part 9 for pushing movement is provided at the end of the material pipe 4. Under the action of the driving part 9, the pushing unit 7 is driven to move back and forth, so that after the reciprocating movement, the function of automatic injection is realized.

[0032] The pushing unit 7 includes a pushing shaft 71 and a tapered end 72 at the end. The tapered end 72 is fixed at the end of the pushing shaft 71. The outer wall of the tapered end 72 fits the inner wall of the material tube 4. A pushing cavity 721 is provided on the straight side of the tapered end 72. A one-way valve 722 is installed in the pushing cavity 721. The outer side of the injection end 5 has a tapered cavity 51 that cooperates with the tapered end 72. The injection end 5 is penetrated by an injection hole 52. The injection hole 52 is used to connect the tapered cavity 51 and the mold unit 2. A one-way valve 722 is also installed in the injection hole 52. When the tapered end 72 reciprocates, the tapered cavity 51 is filled with molten plastic and injected into the mold unit 2. The one-way valve 722 is provided on the liquid inlet and outlet sides of the tapered cavity 51. When the internal space of the tapered cavity 51 changes, the molten plastic is automatically filled and the injection is automatically realized. In addition, the molten plastic injection can also be quantitative, ensuring that the quality of the insoles produced each time is the same.

[0033] The injection end 5 has a heating wire inside to keep the molten plastic at a temperature, and the injection end 5 is made of metal. The molten plastic moving to the injection end 5 will have its temperature lowered if not heated, and during injection, the moving hole is relatively small, which may cause blockage under special circumstances, thus affecting the processing of the insole. Therefore, it is necessary to maintain a certain temperature during injection to avoid a decrease in the temperature of the molten plastic.

[0034] The driving part 9 includes a frame plate 91 fixed in the protective frame 3, a support tube 92 is fixed on one side of the frame plate 91, and the other side thereof is fixed to the material tube 4, a motor 98 for driving is fixed to the outer end of the support tube 92, a support shaft 93 pointing to the axis of the support tube 92 is fixed on the inner wall of the support tube 92, a drive shaft 94 fixed to the push shaft 71 is sleeved in the support tube 92, the push shaft 71 passes through the frame plate 91, a spiral plate 95 for cooperating with the support shaft 93 is fixed to the outer wall of the drive shaft 94, the spiral plate 95 is against the support shaft 93, when the spiral plate 95 rotates, it moves laterally along the support shaft 93, and the spiral plate 95 rotates with the drive shaft 94, When the driving shaft 94 rotates, the spiral plate 95 and the support shaft 93 are squeezed, and the position of the support shaft 93 remains unchanged, and the stressed spiral plate 95 will drive the driving shaft 94 to compress the reset spring 97, and then the spiral plate 95 will be reset under the action of the reset spring 97. After one circle of rotation, a reciprocating motion is realized. In addition, when the spiral plate 95 is squeezed along the support shaft 93, the driving shaft 94 moves. The movement is not instantaneous, so that the conical cavity 51 is slowly filled with molten plastic. After the reset spring 97 is squeezed and reset, it is instantaneous, and the molten plastic in the conical cavity 51 is quickly injected outward to fill the mold unit 2.

[0035] The outer wall of the drive shaft 94 has an anti-rotation block 96 extending outward, and a support sleeve 99 is fixed to the output end of the motor 98. The support sleeve 99 is sleeved with the drive shaft 94 and the anti-rotation block 96. The support sleeve 99 has a return spring 97 supporting the drive shaft 94. When the motor 98 drives the drive shaft 94 to rotate, the drive shaft 94 generates a telescopic movement, so that the motor 98 can drive the drive shaft 94 to rotate.

[0036] The spiral plate 95 is semicircular in side view, and its outer side surface is smooth, so that the spiral plate 95 moves along the support shaft 93 and reduces friction as much as possible.

[0037] A rigid spiral push plate 73 is fixed to the straight side of the conical end 72. When the spiral push plate 73 rotates, it is used to push the molten plastic. There is a gap between the edge of the spiral push plate 73 and the material pipe 4, which drives the molten plastic to move, and the molten plastic returns from the gap between the spiral push plate 73 and the material pipe 4, so that the molten plastic is fully heated and the molten plastic is mixed more evenly.

[0038] There is a mounting ring 711 between the spiral push plate 73 and the push shaft 71, and an outer sleeve 76 is sleeved inside the mounting ring 711. The inner and outer sides of the outer sleeve 76 are in contact with the push shaft 71 and the spiral push plate 73 respectively, so that the spiral push plate 73 can slide along the outer sleeve 76 to prevent the molten plastic at the angle from solidifying;

[0039] A partition 74 is fixed to the end of the outer sleeve 76, and a through groove 75 is opened at the lower end of the partition 74. The through groove 75 is used for the molten plastic to pass through. The upper end of the partition 74 corresponds to the delivery pipe 8. The molten plastic moves downward to block the through groove 75, preventing gas from passing through the through groove 75 and preventing the molten plastic from generating pores.

[0040] The push shaft 71 is provided with a deformation port 712 at the end of the outer sleeve 76. When the push shaft 71 moves in a telescopic manner, the deformation port 712 changes in size to achieve a compacting effect and avoid pores in the molten plastic as much as possible.

[0041] The working principle of the present invention is as follows: the push shaft 71 is driven to rotate by the motor 98, and under the action of the support shaft 93, the spiral plate 95 and the return spring 97, the drive shaft 94 is extended and retracted, and the tapered end 72 is extended and retracted. Due to the action of the one-way valve 722, the tapered cavity 51 is filled with molten plastic, and under the pushing action of the tapered end 72, the molten plastic moves into the mold unit 2. Each pushing of the tapered end 72 is the molding of the insole in the mold unit 2.

[0042] Among them, the molten plastic in the material pipe 4 is heated by the heating sleeve 6, and the molten plastic is pushed laterally under the rotation of the spiral push plate 73. When it is extruded close to the tapered end 72, it is blocked, so that the molten plastic moves back from the gap between the spiral push plate 73 and the material pipe 4, that is, the molten plastic close to the material pipe 4 is constantly moving, so that a large amount of molten plastic is heated, and the molten plastic is relatively heated evenly. In addition, the pushed molten plastic also moves from the pushing cavity 721, and the tapered cavity 51 generates negative pressure when the tapered end 72 is away, so that the molten plastic moves into the tapered cavity 51. The spiral push plate 73 and the negative pressure of the tapered cavity 51 work together to ensure that the tapered cavity 51 is filled. At the same time, the tapered end 72 moves outward to contact with more molten plastic to avoid the formation of gaps inside the tapered cavity 51.

[0043] In addition, the push shaft 71 reciprocates laterally while the outer sleeve 76 remains stationary. The angle formed by the spiral push plate 73 and the outer sleeve 76 makes it easy for the molten plastic to be stuck and solidified. Based on this, the spiral push plate 73 scrapes back and forth along the outer sleeve 76, which to a certain extent avoids the solidification of the molten plastic between the angle between the spiral push plate 73 and the outer sleeve 76. The molten plastic moved into the mold unit 2 is in a molten state, avoiding local blockiness, thereby improving the quality of the insole to a certain extent.

[0044] The plastic particles moving downward from the delivery tube 8 move to one side of the partition 74, and then melt inside the material tube 4. The molten plastic moves downward and can move through the through groove 75. Under the action of the rotation and reciprocating motion of the spiral push plate 73, the molten plastic moves, and the through groove 75 is filled with the molten plastic to prevent gas from passing through the through groove 75. The molten plastic moving inward does not have bubbles. The molten plastic on the outside of the partition 74 is melted first, and under the reciprocating motion of the push shaft 71, the deformation port 712 is deformed. The molten plastic on the outside of the partition 74 will also fill the deformation port 712. The deformation of the deformation port 712 achieves a compacting effect to avoid air holes as much as possible.

[0045] 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.

[0046] 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 safety shoe insole injection molding device, comprising a machine body (1), on which a mold unit (2) and a protective frame (3) are mounted, characterized in that: The protective frame (3) is provided with an injection end (5) fixed to one side of the mold unit (2), a transversely extending material pipe (4) is fixed to the outside of the injection end (5), a delivery pipe (8) connected to the inside of the material pipe (4) is fixed to the upper end of the material pipe (4), a pushing unit (7) for pushing molten plastic is installed inside the material pipe (4), the outside of the material pipe (4) is covered with a heating sleeve (6) for heating, and the end of the material pipe (4) is provided with a driving unit (9) for pushing movement; The pushing unit (7) comprises a pushing shaft (71) and a tapered end (72) at the end thereof, the tapered end (72) being fixed to the end of the pushing shaft (71), the outer wall of the tapered end (72) being in contact with the inner wall of the material tube (4), a pushing cavity (721) being provided through a straight side of the tapered end (72), a one-way valve (722) being installed in the pushing cavity (721), the outer side of the injection end (5) having a tapered cavity (51) cooperating with the tapered end (72), the injection end (5) being provided with an injection hole (52) through it, the injection hole (52) being used to connect the tapered cavity (51) and the mold unit (2), the one-way valve (722) being also installed in the injection hole (52), and when the tapered end (72) reciprocates, the tapered cavity (51) is filled with molten plastic and injected into the mold unit (2); The driving part (9) comprises a frame plate (91) fixed in the protection frame (3), a support tube (92) being fixed on one side of the frame plate (91), and the other side of the frame plate (91) being fixed to the material tube (4), a motor (98) for driving being fixed on the outer end of the support tube (92), a support shaft (93) pointing to the axis of the support tube (92) being fixed on the inner wall of the support tube (92), a drive shaft (94) fixed to the push shaft (71) being sleeved in the support tube (92), the push shaft (71) passing through the frame plate (91), a spiral plate (95) for cooperating with the support shaft (93) being fixed on the outer wall of the drive shaft (94), the spiral plate (95) being abutted against the support shaft (93), and when the spiral plate (95) rotates, it moves laterally along the support shaft (93); The outer wall of the driving shaft (94) has an anti-rotation block (96) extending outwards, and the output end of the motor (98) is fixed with a support sleeve (99), the support sleeve (99) being sleeved with the driving shaft (94) and the anti-rotation block (96), and the support sleeve (99) has a return spring (97) supporting the driving shaft (94), so that when the motor (98) drives the driving shaft (94) to rotate, the driving shaft (94) generates a telescopic movement.

2. The safety shoe insole injection molding equipment according to claim 1 is characterized in that: The injection end (5) has a heating wire inside for maintaining the temperature of the molten plastic, and the injection end (5) is made of metal.

3. The safety shoe insole injection molding equipment according to claim 1 is characterized in that: The spiral plate (95) is semicircular in side view, and its outer surface is smooth.

4. The safety shoe insole injection molding equipment according to claim 1, characterized in that: A rigid spiral push plate (73) is fixed to the straight side of the conical end (72). When the spiral push plate (73) rotates, it is used to push the molten plastic. There is a gap between the edge of the spiral push plate (73) and the material pipe (4).

5. The safety shoe insole injection molding equipment according to claim 4, characterized in that: A mounting ring (711) is provided between the spiral push plate (73) and the push shaft (71), an outer sleeve (76) is sleeved inside the mounting ring (711), and inner and outer sides of the outer sleeve (76) are in contact with the push shaft (71) and the spiral push plate (73) respectively; A partition plate (74) is fixed to the end of the outer sleeve (76), a through groove (75) is provided at the lower end of the partition plate (74), and the through groove (75) is used for molten plastic to pass through, and the upper end of the partition plate (74) corresponds to the delivery pipe (8).

6. The safety shoe insole injection molding equipment according to claim 5, characterized in that: The push shaft (71) is provided with a deformation port (712) on the outside. The deformation port (712) is located at the end of the outer sleeve (76). When the push shaft (71) moves in a telescopic manner, the deformation port (712) changes in size.

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