Circular rubber injection equipment and method for rubber shoes based on annular rotation and dynamic temperature control

Abstract

The invention discloses circular rubber injection equipment and method for rubber shoes based on annular rotation and dynamic temperature control, and belongs to the field of rubber shoe production equipment.The circular rubber injection equipment is provided with an annular rotary multi-station mold set, seamless circular connection and parallel operation of rubber injection, vulcanization, cooling and demolding procedures are achieved, and the production efficiency is improved. The problem of low production efficiency caused by long vulcanization time of a traditional single mold is solved, the mold group is arranged to be in a turnover type, the mold group is slightly swung left and right in a short time before rubber is not crosslinked in the initial stage of vulcanization, on one hand, uniform circulation of rubber in a mold cavity is promoted, on the other hand, the temperature uniformity is improved through rubber flowing, and in the vulcanization process, the production efficiency is improved. The temperature of rubber in a cavity is monitored in real time through a thermocouple, dynamic temperature compensation is conducted on a mold set according to the real-time temperature, in addition, a heat exchange assembly communicates with a heating cavity and a refrigerating cavity in a circulating treatment box through a heat source pipe and a cold source pipe correspondingly, and rapid switching of a heat source and a cold source is achieved according to different stages.

Description

Technical Field

[0001] The present invention relates to the field of rubber shoe production equipment, and more particularly to a rubber shoe circulating glue injection device and method based on annular rotation and dynamic temperature control. Background Art

[0002] Rubber shoes are made of engineering plastics as the main raw material. They have good wear resistance, toughness and waterproofness. They are widely used in products such as rain boots, labor protection shoes and outdoor shoes, and are widely used in daily life.

[0003] The molding process of rubber shoe soles requires a mold to shape the injected rubber. Currently, single-mold production is often used. Due to the long vulcanization time, the waiting time for each step is too long, and the production efficiency is low.

[0004] At the same time, after the injection molding machine injects liquid rubber into the mold, the mold is in a relatively static state, and the liquid rubber is prone to uneven circulation in the mold, resulting in inconsistent temperatures in different parts of the mold, and then causing uneven vulcanization of the rubber, which will lead to unqualified quality of the rubber shoes produced.

[0005] To this end, in response to practical problems in the prior art, a rubber shoe circulating glue injection device and method based on circular rotation and dynamic temperature control are proposed. Summary of the Invention

[0006] The purpose of the present invention is to solve the existing problems and provide a rubber shoe circulating glue injection device and method based on circular rotation and dynamic temperature control compared to the existing technology.

[0007] The object of the present invention can be achieved through the following technical solutions: a rubber shoe circulating glue injection device based on circular rotation and dynamic temperature control, comprising an operating table and a rotating ring table rotatably driven on its upper part, wherein four groups of molding components are annularly installed in the circumferential direction of the rotating ring table, wherein the operating table is located on one side of the rotating ring table and is set as a glue injection station, wherein an injection molding machine adapted to the molding components is installed at the glue injection station by a support frame, and the operating table is adjacent to the glue injection station and is vertically arranged as a demolding station;

[0008] The molding assembly includes a rotating frame rotatably embedded in a rotating ring table, a mold group with upper and lower ends extending outward is installed in the rotating frame, the mold group includes a fixed mold and a movable mold, the fixed mold is fixed to the inner wall of the outer side of the rotating frame, and an electric push cylinder for horizontally driving the fixed mold is fixed to the inner end wall of the rotating frame;

[0009] The top of the fixed mold is provided with a glue injection port that is adapted to the position of the glue injection nozzle of the injection molding machine. A heat exchange component is fixedly installed on the end wall of the fixed mold away from the movable mold, and a dynamic temperature control component that cooperates with the heat exchange component is fixedly installed on the outer peripheral end wall of the rotating ring table.

[0010] Furthermore, a material discharge chute with an outer end opening is provided at the demoulding station, and a conveyor belt extending outward is provided below the material discharge chute.

[0011] Furthermore, a rotating motor for rotating and swinging the rotating frame left and right is fixedly embedded in the inner end wall of the rotating ring platform, and a rotating cavity with an inner end opening for the rotating frame to swing left and right is opened on the end wall of the rotating ring platform.

[0012] Furthermore, both the fixed mold and the movable mold have mold grooves on their inner end walls, and the mold groove depth inside the movable mold is greater than the groove mold depth inside the fixed mold. After the two mold grooves are combined, a cavity suitable for the shoe product is formed. A plurality of thermocouples arranged adjacent to the mold grooves are installed inside the movable mold.

[0013] Furthermore, the heat exchange assembly includes an upper connecting box and a lower connecting box fixedly installed on the upper and lower ends of the fixed mold. A plurality of heat exchange tubes that are arranged in contact with the outer end wall of the fixed mold are fixedly installed between the upper connecting box and the lower connecting box, and adjacent heat exchange tubes are fixedly connected by heat conducting plates.

[0014] Furthermore, the dynamic temperature control component includes a circulation treatment box fixed on the outer wall of the rotating ring table. The interior of the circulation treatment box is divided into a heating chamber and a cooling chamber by a partition. The cooling chamber and the heating chamber are distributed inside and outside. The cooling chamber and the heating chamber are connected to the heat exchange pipe through the cold source pipe and the heat source pipe respectively.

[0015] Furthermore, the partition is embedded with a semiconductor refrigeration plate with a cooling end and a heating end extending to the cooling cavity and the heating cavity respectively, and an electric heater acting on the heating cavity is also installed on the outer end wall of the circulation treatment box.

[0016] Furthermore, the cold source pipe includes an upper cold pipe connected to the upper connecting box and the upper part of the refrigeration cavity, and a lower cold pipe connected to the lower connecting box and the lower part of the refrigeration cavity. The heat source pipe includes an upper heat pipe connected to the upper connecting box and the upper part of the heating cavity, and a lower heat pipe connected to the lower connecting box and the lower part of the heating cavity.

[0017] The present invention also proposes a method for circular glue injection of rubber shoes based on circular rotation and dynamic temperature control, comprising the following steps:

[0018] Step 1: Mold preheating: After the mold group is closed, it rotates with the rotating ring table to the injection station, and the mold group is circulated and preheated by the cooperation between the heat exchange component, the heat source pipe and the circulation treatment box;

[0019] Step 2: Injection molding and vulcanization: After preheating, lower the injection molding machine until the injection nozzle is aligned with the injection port, inject a fixed amount of rubber liquid into the mold cavity, lift the injection molding machine upward, rotate the rotating table 90 degrees, and rotate the next molding assembly to the injection station;

[0020] After the injection, the mold set rotates to the next station. In the early stage of vulcanization, before the rubber is cross-linked, the mold set is slightly swung left and right for a short time. This not only promotes the uniform circulation of rubber in the cavity, but also improves the temperature uniformity through the flow of rubber.

[0021] During the vulcanization process, the temperature of the rubber in the cavity is monitored in real time using thermocouples, and the mold set is temperature compensated based on the real-time temperature.

[0022] Step 3: Cooling and demoulding: Switch the connection between the heat exchange component and the circulation treatment box to the cold source pipe, and use circulation cooling to achieve the shaping of the shoe product. When the mold group rotates to the demoulding station, slightly rotate the mold group inward, and then use the injection molding machine to push the movable mold outward to separate it from the fixed mold. After demoulding, the shoe product falls onto the conveyor belt and is transported out.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] 1. This solution is to set up a circular rotary multi-station mold group to achieve seamless cycle connection and parallel operation of injection, vulcanization, cooling and demoulding processes, so as to solve the problem of low production efficiency caused by the long single vulcanization time of traditional single molds. In addition, the mold group is set to be flippable. In the early stage of vulcanization, before the rubber material is cross-linked, the mold group is slightly swung left and right for a short time. On the one hand, it promotes the uniform circulation of rubber in the mold cavity, and on the other hand, it improves the temperature uniformity through the flow of rubber.

[0025] 2. This solution sets a heat exchange component on the outer end wall of the fixed mold. The heat exchange component is connected to the heating cavity and the cooling cavity in the circulation treatment box through the heat source pipe and the cold source pipe respectively. The heat source and the cold source can be quickly switched according to the different stages of injection molding. During the vulcanization process, the rubber temperature in the cavity is monitored in real time by a thermocouple. According to the real-time temperature, the mold group is temperature compensated by the combination of semiconductor refrigeration sheet and electric heater, thereby controlling the vulcanization time of the rubber and effectively improving the product quality. During the cooling and demolding process, the connection between the heat exchange component and the circulation treatment box is switched to the cold source pipe, and the shoe product is finalized by circulating cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the external structure of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the joint between the rotating ring platform and multiple groups of forming components of the present invention;

[0028] Figure 3 A bottom view of the joint between the rotating ring platform and the multiple forming components of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the molding assembly of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the mold assembly of the present invention when it is separated from the rotating frame;

[0031] Figure 6 This is a structural schematic diagram of the mold assembly and the heat exchange component of the present invention when they are detached;

[0032] Figure 7 It is a schematic structural diagram of the present invention when working.

[0033] Description of the numbers in the figure:

[0034] 1. Operating table; 101. Material discharge slot; 102. Annular guide groove; 2. Rotating ring table; 201. Guide wheel; 3. Rotating frame; 4. Mold assembly; 41. Fixed mold; 421. Glue injection port; 42. Moving mold; 422. Guide plate; 5. Rotating motor; 6. Electric push cylinder; 7. Injection molding machine;

[0035] 8. Heat exchange assembly; 81. Heat exchange tube; 82. Upper connecting box; 83. Lower connecting box; 84. Heat conducting plate; 9. Circulation treatment box; 901. Upper cooling tube; 902. Lower cooling tube; 903. Upper heat pipe; 904. Lower heat pipe; 10. Semiconductor cooling plate; 11. Electric heater; 12. Conveyor belt. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0037] Example 1: In view of the low productivity of traditional single-mold production and the problem that traditional static molds are prone to uneven flow of liquid rubber in the mold, resulting in inconsistent temperatures at different locations in the mold and subsequently uneven rubber vulcanization, the following technical solution is proposed:

[0038] In this embodiment, there is a rubber shoe cycle glue injection device based on circular rotation and dynamic temperature control, please refer to Figure 1-Figure 3 , including an operating table 1 and a rotating ring table 2 driven to rotate on its upper part. A driving motor for rotating the rotating ring table 2 is fixedly installed at the bottom of the operating table 1. A plurality of guide wheels 201 are distributed at the bottom end of the rotating ring table 2. An annular guide groove 102 adapted to the guide wheel 201 is opened on the upper end wall of the operating table 1 to improve the rotation stability of the rotating ring table 2.

[0039] Four groups of molding components are installed in a circular shape in the circumferential direction of the rotating ring table 2. The operating table 1 is located on one side of the rotating ring table 2 and is set as a glue injection station. An injection molding machine 7 adapted to the molding components is installed at the glue injection station through a support frame. The operating table 1 is adjacent to the glue injection station and is vertically set as a demoulding station. A discharge slot 101 with an outer end opening is opened at the demoulding station, and a conveyor belt 12 extending outward is set below the discharge slot 101.

[0040] The other two workstations are vulcanization and cooling respectively. The four workstations are distributed in a cross shape, realizing seamless cycle connection and parallel operation of injection, vulcanization, cooling and demoulding processes, so as to solve the problem of low production efficiency of traditional single molds due to long single vulcanization time.

[0041] See also Figure 2-Figure 6 The molding assembly includes a rotating frame 3 rotatably embedded in the rotating ring platform 2, and a rotating motor 5 for rotating and swinging the rotating frame 3 left and right is fixedly embedded in the inner end wall of the rotating ring platform 2. A rotating cavity for the rotating frame 3 to swing left and right and open at the inner end is opened on the end wall of the rotating ring platform 2, and a mold group 4 with the upper and lower ends extending outward is installed in the rotating frame 3;

[0042] The mold assembly 4 includes a fixed mold 41 and a movable mold 42. The fixed mold 41 is fixed to the inner wall of the outer side of the turret 3. An electric push cylinder 6 is fixed to the inner end wall of the turret 3 to horizontally drive the fixed mold 41. Guide plates 421 are fixed to the left and right sides of the movable mold 42 and are slidably mounted on the upper and lower end surfaces of the turret. A glue injection port 411 is opened at the top of the fixed mold 41 to match the glue injection nozzle position of the injection molding machine 7.

[0043] Both the fixed mold 41 and the movable mold 42 have mold grooves on their inner end walls, and the mold groove depth inside the movable mold 42 is greater than the groove mold depth inside the fixed mold 41. When the two mold grooves are combined, they form a cavity that is compatible with the shoe product. Multiple thermocouples adjacent to the mold grooves are installed inside the movable mold 42.

[0044] See also Figure 7 , set the mold group to be flippable left and right. In the early stage of vulcanization, before the rubber is cross-linked, slightly swing the mold group 4 left and right for a short time. On the one hand, it promotes the uniform circulation of rubber in the cavity, and on the other hand, it improves the temperature uniformity by the flow of rubber.

[0045] Example 2: Please refer to Figure 4-Figure 6 The end wall of the fixed mold 41 away from the movable mold 42 is fixedly installed with a heat exchange component 8, and the outer peripheral end wall of the rotating ring table 2 is fixedly installed with a dynamic temperature control component that cooperates with the heat exchange component 8;

[0046] The heat exchange assembly 8 includes an upper connecting box 82 and a lower connecting box 83 fixedly mounted on the upper and lower ends of the fixed mold 41. A plurality of heat exchange tubes 81 are fixedly mounted between the upper connecting box 82 and the lower connecting box 83 and are arranged in contact with the outer end wall of the fixed mold 41. Adjacent heat exchange tubes 81 are fixedly connected by heat conducting fins 84.

[0047] The dynamic temperature control component includes a circulation treatment box 9 fixed on the outer wall of the rotating ring table 2. The interior of the circulation treatment box 9 is divided into a heating chamber and a cooling chamber by a partition. The heating chamber and the cooling chamber are both filled with heat transfer oil. The cooling chamber and the heating chamber are distributed inside and outside. The cooling chamber and the heating chamber are connected to the heat exchange pipe 81 through the cold source pipe and the heat source pipe respectively.

[0048] Before glue injection, in the preheating stage, the upper connecting box 82 and the lower connecting box 83 are connected to the heat source pipe, and the heated heat transfer oil is pumped into the upper connecting box 82 through the upper heat pipe 903. The heat transfer oil flows downward along multiple heat exchange tubes 81, is collected by the lower connecting box 83, and then returns to the heating cavity through the lower heat pipe 904. During the circulation of the heat transfer oil, heat is transferred to the mold cavity. Since the mold cavity in the fixed mold 41 is deeper than the mold cavity in the movable mold 42, it is only necessary to add a heat exchange component 8 on the outside of the fixed mold 41 to evenly transfer the heat source to the mold cavity.

[0049] During the vulcanization process, the temperature of the rubber in the cavity is monitored in real time using a thermocouple, and the mold assembly 4 is temperature compensated according to the real-time temperature, thereby controlling the vulcanization time of the rubber and effectively improving product quality.

[0050] During the cooling and shaping process, the connection between the heat exchange component 8 and the circulation treatment box 9 is switched to the cold source pipe, and the moderately cooled heat transfer oil is pumped into the heat exchange component 8 to achieve rapid switching of the heat source and the cold source, and the shoe product is shaped by circulating cooling.

[0051] As can be seen from the first and second embodiments, the present invention further proposes a method for circularly injecting glue into rubber shoes based on circular rotation and dynamic temperature control, comprising the following steps:

[0052] Step 1: Mold preheating: After the mold assembly 4 rotates to the glue injection station along with the rotating ring table 2 after mold closing, the mold assembly 4 is subjected to cyclic preheating treatment by utilizing the cooperation between the heat exchange component 8, the heat source pipe and the circulation treatment box 9;

[0053] Step 2: Injection molding and vulcanization: After preheating, lower the injection molding machine 7 until the injection nozzle docks with the injection port 411, inject a fixed amount of rubber liquid into the cavity of the mold assembly 4, lift the injection molding machine 7 upward, rotate the rotating ring table 2 90 degrees, and rotate the next group of molding components to the injection station;

[0054] After the injection of the rubber, the mold group 4 rotates to the next station. In the early stage of vulcanization, before the rubber is cross-linked, the mold group 4 is slightly swung left and right for a short time. On the one hand, it promotes the uniform circulation of the rubber in the cavity, and on the other hand, it improves the temperature uniformity through the flow of the rubber.

[0055] During the vulcanization process, the temperature of the rubber in the cavity is monitored in real time using a thermocouple, and the mold assembly 4 is temperature compensated according to the real-time temperature;

[0056] Step 3, cooling and demoulding: switch the connection between the heat exchange component 8 and the circulation treatment box 9 to the cold source pipe, and use circulation cooling to achieve the shaping of the shoe product. When the mold group 4 rotates to the demoulding station, slightly rotate the mold group 4 inward, and then use the injection molding machine 7 to push the movable mold 42 outward to separate it from the fixed mold 41. After demoulding, the shoe product falls onto the conveyor belt 12 for transportation.

[0057] In summary, a circular rotary multi-station mold assembly is set up to achieve seamless cycle connection and parallel operation of injection, vulcanization, cooling and demoulding processes, so as to solve the problem of low production efficiency caused by the long single vulcanization time of traditional single molds. In addition, the mold assembly is set to be flippable left and right. In the early stage of vulcanization, before the rubber compound is cross-linked, the mold assembly is slightly swung left and right for a short time.

[0058] On the one hand, it promotes the uniform circulation of rubber in the cavity, and on the other hand, it improves the temperature uniformity and vulcanization effect through the flow of rubber. At the same time, during the vulcanization process, the temperature of the rubber in the cavity is monitored in real time by thermocouples. The temperature compensation of the mold group 4 is performed according to the real-time temperature, thereby controlling the vulcanization time of the rubber and effectively improving the product quality.

[0059] In addition, the mold group 4 is set to be reversible. During the demoulding process, the mold group 4 can be tilted and flipped downward toward the movable mold 42 before opening the mold. This is conducive to demoulding the shoe product and smoothly falling onto the conveyor belt 12, thereby improving the demoulding and unloading efficiency.

[0060] The above are only preferred specific implementation methods of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved conception of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A rubber shoe circulating glue injection device based on circular rotation and dynamic temperature control, comprising an operating table (1) and a rotating ring table (2) rotatably driven on the upper portion thereof, characterized in that: The rotating ring platform (2) is provided with four groups of molding components in a circular manner in the circumferential direction. The operating platform (1) is located on one side of the rotating ring platform (2) and is set as a glue injection station. An injection molding machine (7) adapted to the molding components is installed at the glue injection station via a support frame. The operating platform (1) is adjacent to the glue injection station and is vertically arranged as a demoulding station. The molding assembly comprises a rotating frame (3) rotatably embedded and mounted on a rotating ring platform (2); a mold group (4) with upper and lower ends extending outward is mounted in the rotating frame (3); the mold group (4) comprises a fixed mold (41) and a movable mold (42); the fixed mold (41) is fixed to the outer inner wall of the rotating frame (3); An electric push cylinder (6) for horizontally driving the fixed mold (41) is fixed on the inner end wall of the rotating frame (3); a glue injection port (411) adapted to the position of the glue injection nozzle of the injection molding machine (7) is opened on the top of the fixed mold (41); a heat exchange component (8) is fixedly installed on the end wall of the fixed mold (41) away from the movable mold (42); and a dynamic temperature control component coordinated with the heat exchange component (8) is fixedly installed on the outer peripheral end wall of the rotating ring platform (2).

2. The rubber shoe circulating glue injection equipment based on circular rotation and dynamic temperature control according to claim 1 is characterized in that: The demoulding station is provided with a material discharge slot (101) with an outer end opening, and a conveyor belt (12) extending outward is provided below the material discharge slot (101).

3. The rubber shoe circulating glue injection equipment based on circular rotation and dynamic temperature control according to claim 1 is characterized in that: The fixed mold (41) and the movable mold (42) are both provided with mold grooves on their inner end walls, and the mold groove depth inside the movable mold (42) is greater than the groove mold depth inside the fixed mold (41). After the two mold grooves are combined, a cavity adapted to the shoe product is formed. A plurality of thermocouples arranged adjacent to the mold grooves are installed inside the movable mold (42).

4. The rubber shoe circulating glue injection equipment based on circular rotation and dynamic temperature control according to claim 1 is characterized in that: The heat exchange assembly (8) comprises an upper connecting box (82) and a lower connecting box (83) fixedly mounted on the upper and lower ends of the fixed mold (41); a plurality of heat exchange tubes (81) fixedly mounted between the upper connecting box (82) and the lower connecting box (83) and arranged in contact with the outer end wall of the fixed mold (41); and adjacent heat exchange tubes (81) are fixedly connected via heat conducting fins (84).

5. The rubber shoe circulating glue injection equipment based on circular rotation and dynamic temperature control according to claim 1 is characterized in that: The dynamic temperature control component comprises a circulation treatment box (9) fixed on the outer wall of the rotating ring platform (2); the interior of the circulation treatment box (9) is divided into a heating chamber and a cooling chamber by a partition; the cooling chamber and the heating chamber are distributed inside and outside; the cooling chamber and the heating chamber are connected to the heat exchange pipe (81) through a cold source pipe and a heat source pipe respectively.

6. The rubber shoe circulating glue injection equipment based on circular rotation and dynamic temperature control according to claim 1 is characterized in that: The partition is embedded with a semiconductor refrigeration plate (10) with a cooling end and a heating end extending to the cooling cavity and the heating cavity respectively, and an electric heater (11) acting on the heating cavity is also installed on the outer end wall of the circulation treatment box (9).

7. The rubber shoe circulating glue injection equipment based on circular rotation and dynamic temperature control according to claim 1 is characterized in that: The cold source pipe comprises an upper cold pipe (901) connected to an upper connecting box (82) and an upper portion of the refrigeration cavity, and a lower cold pipe (902) connected to a lower connecting box (83) and a lower portion of the refrigeration cavity; the heat source pipe comprises an upper heat pipe (903) connected to an upper connecting box (82) and an upper portion of the heating cavity, and a lower heat pipe (904) connected to a lower connecting box (83) and a lower portion of the heating cavity.

8. A method for circularly rotating and dynamically controlling the temperature of rubber shoes, comprising: a method for circularly rotating and dynamically controlling the temperature of rubber shoes, wherein the method comprises: The following steps are involved: Step 1: Preheating the mold: After the mold assembly (4) is rotated to the injection station after the mold is closed, the mold assembly (4) is cyclically preheated by using the heat exchange component (8) and the heat source pipe; Step 2: Injection molding and vulcanization: lower the injection molding machine (7) to inject a fixed amount of rubber liquid into the mold cavity of the mold group (4), lift the injection molding machine (7) upward, rotate the rotating ring table (2) by 90 degrees, and rotate the next group of molding components to the injection station; At the initial stage of vulcanization (before the rubber is cross-linked), the mold assembly (4) is slightly swung left and right for a short time to promote the uniform circulation of the rubber in the cavity and to improve the temperature uniformity by the flow of the rubber; During the vulcanization process, the temperature of the rubber in the cavity is monitored in real time using a thermocouple, and the mold assembly (4) is temperature compensated according to the real-time temperature; Step 3, cooling and demoulding: the connection between the heat exchange component (8) and the circulation treatment box (9) is switched to a cold source pipe, and the shoe product is shaped by using circulation cooling. When the mold group (4) rotates to the demoulding station, the mold group (4) is slightly rotated inward, and the shoe product falls onto the conveyor belt (12) after being demoulded by the mold group (4).

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