An automatic processing assembly line for foamed rubber light sheet foamed bottom

Abstract

The utility model belongs to rubber product processing technical field especially for a kind of rubber light piece foaming bottom automation processing assembly line for foaming uniformization, including the foaming box of rubber light piece foaming bottom automation processing assembly line, cooling box one and the closed conveying belt between the foaming box and the cooling box one, the foaming box is provided with sectional foaming mechanism, the inner fixedly connected with baffle in the cooling box one, the bottom of the baffle and the top inner wall of the cooling box import and export are all fixedly connected with two right flexible PVC sealing curtain.This utility model structure design is reasonable, through three section gradient type temperature control and independent airflow circulation, foaming uniformization is better, rubber light piece foaming bottom elasticity is improved, satisfy high-end shoemaking demand, through circulating water cooling and air cooling cooperation, cooling time is shorter, efficiency is higher, and it can benefit the preheating of cooling water by foaming box waste heat, both improve heat exchange efficiency in initial cooling stage, and recycle foaming box waste heat.

Description

Technical Field

[0001] This utility model relates to the field of rubber product processing technology, and in particular to an automated processing line for foaming lightweight rubber sheets for uniform foaming. Background Technology

[0002] Due to its lightweight, good elasticity, and strong cushioning properties, lightweight rubber foam soles are widely used in the footwear industry. Automated processing lines for homogenizing the foaming of lightweight rubber foam soles typically include a raw material pretreatment unit, a precise batching unit, a mixing and plasticizing unit, a continuous extrusion unit, a foaming unit, a shaping and cooling unit, an online inspection unit, a finished product cutting unit, and a PLC central control system. These units are connected by enclosed conveyor belts to form a continuous production process.

[0003] However, traditional foaming boxes are mostly integrally heated, resulting in uneven temperature field and airflow distribution within the cavity. This leads to localized over-foaming (bubble bursting) or under-foaming (lumps) of the rubber sheets, resulting in significant density deviations in the finished product. This affects the elasticity and lifespan of the shoe sole. Furthermore, the cooling units often use single water cooling or air cooling, lacking coordinated design. In addition, the high-temperature heat generated by the foaming box is directly discharged without being recycled, resulting in high energy consumption of the entire production line. Therefore, we propose an automated processing line for rubber sheet foaming soles to achieve uniform foaming and solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings mentioned above by proposing an automated processing line for foaming lightweight rubber sheets to achieve uniform foaming.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automated processing line for homogenizing foamed rubber sheet bottoms includes a foaming box, a cooling box, and a closed conveyor belt disposed between the foaming box and the cooling box. The foaming box is equipped with a segmented foaming mechanism. A partition is fixedly connected inside the cooling box. Two flexible PVC sealing curtains are fixedly connected to the bottom of the partition and the top inner wall of the inlet and outlet of the cooling box. A circulating water cooling mechanism is provided between the partition, the cooling box, and the foaming box. An air cooling mechanism is provided between the partition and the cooling box.

[0007] As a preferred embodiment of this utility model, the segmented foaming mechanism includes three foaming chambers, multiple infrared heating tubes, three temperature sensors, three pressure sensors, and three circulating fans, all located within a foaming chamber. The multiple infrared heating tubes are respectively fixedly connected to the front and rear inner walls of the corresponding foaming chambers. The temperature sensors, pressure sensors, and circulating fans are all fixedly connected to the top of the foaming chambers. The circulating fans are connected to the foaming chambers, and a return pipe is fixedly connected to the front side of the circulating fans. The rear end of the return pipe is fixedly connected to the front side of the foaming chamber.

[0008] As a preferred embodiment of this invention, two flexible PVC sealing curtains are fixedly connected to the top inner walls of both sides of the foaming cavity inlet and outlet.

[0009] In a preferred embodiment of this utility model, the circulating water cooling mechanism includes a heat-conducting box fixedly connected to one side of the foaming box, a water pump and a heat exchanger fixedly connected to the front side of the first cooling box, and a second cooling box fixedly connected inside the first cooling box. The bottom of the second cooling box is fixedly connected to multiple heat-conducting plates. The heat exchanger, the water pump, and the front side of the cooling box are sequentially connected. The heat exchanger and the front side of the heat-conducting box are fixedly connected by a return pipe. The heat-conducting box and the rear side of the first cooling box are fixedly connected by a water outlet pipe. The bottom of the multiple heat-conducting plates is fixedly connected to the same heat-conducting silicone pad.

[0010] As a preferred embodiment of this invention, an inlet valve and an outlet valve are fixedly connected to one side of the heat conduction box.

[0011] As a preferred embodiment of this invention, a heat-conducting plate is fixedly connected to the front side of the heat exchanger, and multiple heat dissipation fins are fixedly connected to the front side of the heat-conducting plate.

[0012] As a preferred embodiment of this utility model, the air-cooling mechanism includes an air-cooling fan fixedly connected to the top of the cooling box, air outlet dustproof nets fixedly connected to the front and rear inner walls of the cooling box, multiple guide plates fixedly connected to the front and rear inner walls of the cooling box, a filter plate detachably fixedly connected to the top of the air-cooling fan, and a cooling temperature sensor fixedly connected to one inner wall of the cooling box.

[0013] As a preferred embodiment of this utility model, a connecting ring is fixedly sleeved on the outer side of the filter plate, and four elastic claws are fixedly connected to the bottom of the connecting ring. An annular bracket is fixedly sleeved on the outer side of the air-cooled fan, and the four elastic claws are movably engaged with the outer side of the annular bracket.

[0014] In this utility model, an automated processing line for foaming lightweight rubber sheet soles is described. Through three-stage gradient temperature control and independent airflow circulation, the foaming uniformity is better and the elasticity of the foamed rubber sheet soles is greatly improved, meeting the needs of high-end shoe manufacturing.

[0015] In this invention, an automated processing line for foaming lightweight rubber sheets for uniform foaming is described. Through the combined use of circulating water cooling and air cooling, the cooling time is shorter and the efficiency is higher. Furthermore, the waste heat from the foaming chamber can be used to preheat the cooling water, which not only improves the heat exchange efficiency in the initial cooling stage but also recovers the waste heat from the foaming chamber, achieving a waste heat recovery rate of 40%. The overall energy consumption of the production line is reduced by 35%, meeting the requirements of green production. The flexible sealing and multi-stage filtration throughout the entire process result in better dust and interference prevention, ensuring cleanliness, improving cooling uniformity, reducing sheet warpage, and achieving higher dimensional accuracy.

[0016] This utility model has a reasonable structural design. Through three-stage gradient temperature control and independent airflow circulation, the foaming is more uniform and the elasticity of the rubber lightweight foam sole is greatly improved, meeting the needs of high-end shoe manufacturing. Through the synergy of circulating water cooling and air cooling, the cooling time is shorter and the efficiency is higher. Moreover, the waste heat of the foaming box can be used to preheat the cooling water, which not only improves the heat exchange efficiency in the initial stage of cooling, but also recovers the waste heat of the foaming box. Attached Figure Description

[0017] Figure 1 This is a front view of an automated processing line for foaming uniformity of lightweight rubber sheet foaming bottoms proposed in this utility model.

[0018] Figure 2 This is a rear view of an automated processing line for foaming uniformity of lightweight rubber sheet foaming bottoms proposed in this utility model.

[0019] Figure 3 This is a cross-sectional view of a foaming box in an automated processing line for foaming uniformity of lightweight rubber sheet foaming bottoms, as proposed in this utility model.

[0020] Figure 4 This is a cross-sectional view of a cooling box in an automated production line for processing lightweight rubber sheet foamed bottoms for uniform foaming, as proposed in this utility model.

[0021] Figure 5 for Figure 4 A schematic diagram of the structure of part A.

[0022] In the diagram: 1. Foaming box; 2. Cooling box one; 3. Enclosed conveyor belt; 4. Segmented foaming mechanism; 41. Return pipe one; 42. Temperature sensor; 43. Circulating fan; 44. Pressure sensor; 45. Infrared heating tube; 46. Foaming chamber; 47. Left flexible PVC sealing curtain; 5. Circulating water cooling mechanism; 50. Thermal conductive silicone pad; 51. Water pump; 52. Heat exchanger; 53. Heat-conducting plate; 54. Heat dissipation fins; 55. Return pipe two; 56. Heat-conducting box; 57. Water outlet pipe; 58. Cooling box two; 59. Thermal conductive sheet; 6. Air-cooling mechanism; 61. Exhaust dustproof net; 62. Air-cooled fan; 63. Filter plate; 64. Connecting ring; 65. Elastic claw; 66. Annular seat; 67. Guide plate; 68. Cooling temperature sensor; 7. Partition; 8. Right flexible PVC sealing curtain. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Reference Figures 1-5 An automated processing line for homogenizing foamed rubber sheet bottoms includes a foaming box 1, a cooling box 2, and a closed conveyor belt 3 positioned between the foaming box 1 and the cooling box 2. The foaming box 1 is equipped with a segmented foaming mechanism 4. A partition 7 is fixedly connected inside the cooling box 2. Two flexible PVC sealing curtains 8 are fixedly connected to the bottom of the partition 7 and the top inner wall of the inlet and outlet of the cooling box 2. A circulating water cooling mechanism 5 is provided between the partition 7, the cooling box 2, and the foaming box 1. An air cooling mechanism 68 is provided between the partition 7 and the cooling box 2. As described in the technical background, the automated processing line has its own control system, which can regulate the equipment on the foaming box 1 and the cooling box 2.

[0025] Specifically, the segmented foaming mechanism 4—gradient temperature control—achieves uniform foaming: The segmented foaming mechanism 4 includes three foaming chambers 46 opened in the foaming box 1, multiple infrared heating tubes 45, three temperature sensors 42, three pressure sensors 44, and three circulating fans 43. The multiple infrared heating tubes 45 are respectively fixedly connected to the front and rear inner walls of the corresponding foaming chambers 46. The temperature sensors 42, pressure sensors 44, and circulating fans 43 are all fixedly connected to the top of the foaming chambers 46. The circulating fans 43 are connected to the foaming chambers 46. The front side of the circulating fans 43 is fixedly connected to a return pipe 41, and the rear end of the return pipe 41 is fixedly connected to the front side of the foaming chambers 46. Two left and right flexible PVC sealing curtains 8 are fixedly connected to the top inner walls of the inlets and outlets on both sides of the foaming chambers 46.

[0026] Three-stage gradient temperature control adapts to the entire foaming process: The three foaming chambers 46 correspond to the preheating section, the foaming section and the stabilization section respectively. Each section has independent temperature control. In the first chamber of the preheating section, there are infrared heating tubes 45 with a power of 1kW / tube and 12 tubes per chamber. The temperature is set to 160-180℃. An internal airflow speed of 1-2m / s is formed by the circulating fan 43 and the return pipe 41, which softens the rubber sheet and initially decomposes the foaming agent, avoiding the bursting of bubbles due to excessive temperature difference during subsequent foaming.

[0027] Second chamber of foaming section: Temperature set at 190-210℃, circulation speed increased to 2-3m / s to ensure full decomposition of foaming agent and uniform bubble growth with bubble diameter deviation ≤±0.2mm;

[0028] The third chamber in the stabilization section: the temperature is set to 200-220℃, and the pressure inside the chamber is maintained at 0.2-0.3MPa. The pressure sensor 44 monitors the pressure in real time to keep the bubbles in place and prevent them from shrinking back.

[0029] Sealing and stable airflow: The left flexible PVC sealing curtain 47 at the inlet and outlet of the foaming chamber 46 can reduce heat loss in the chamber by 30% and isolate external dust; the cooperation between the circulating fan 43 and the return pipe 41 ensures that the airflow uniformity of each chamber reaches more than 95% and avoids local temperature fluctuations.

[0030] Specifically, the circulating water cooling mechanism 5—coordinated cooling and heat recovery—makes it energy-efficient and effective. The circulating water cooling mechanism 5 includes a heat-conducting box 56 fixedly connected to one side of the foaming box 1, a water pump 51 and a heat exchanger 52 fixedly connected to the front side of the cooling box 2, and a cooling box 2 58 fixedly connected inside the cooling box 2. Multiple heat-conducting fins 59 are fixedly connected to the bottom of the cooling box 2 58. The heat exchanger 52, the water pump 51, and the front side of the cooling box 2 58 are sequentially connected. A return pipe 2 55 is fixedly connected to the front side of the heat exchanger 52 and the heat-conducting box 56. A water outlet pipe 57 is fixedly connected between the heat-conducting box 56 and the rear side of the cooling box 2. The bottom of the multiple heat-conducting fins 59 is fixedly connected to the same heat-conducting silicone pad 50. An inlet valve and an outlet valve are fixedly connected to one side of the heat-conducting box 56. A heat-conducting plate 53 is fixedly connected to the front side of the heat exchanger 52, and multiple heat dissipation fins 54 are fixedly connected to the front side of the heat-conducting plate 53.

[0031] Dual-zone water cooling synergy for rapid shaping: The cooling box is made of 58304 stainless steel. The water pump 51 drives the cooling water to circulate in the second cooling box 58, the water pump 51, the heat exchanger 52, the second return pipe 55, the heat conduction box 56, the outlet pipe 57 and the second cooling box 58. The heat conduction plate 59 at the bottom of the second cooling box 58 is made of copper and is directly attached to the rubber sheet on the closed conveyor belt 3 with the heat conduction silicone pad 50. The sheet temperature is rapidly reduced from above 200℃ to below 80℃ through heat conduction, and the initial shaping is achieved.

[0032] Heat recovery reduces energy consumption: The high temperature generated during the operation of foaming box 1 is conducted to the heat transfer box 56 through the side wall, which can preheat the cooling water, raising the temperature from 15℃ to 30℃; the preheated cooling water then enters the second cooling box 58, which not only improves the heat exchange efficiency in the initial cooling stage, but also recovers the waste heat of the foaming box, reducing the overall production line energy consumption by 35%.

[0033] Heat dissipation assistance ensures stable cooling: The heat-conducting plate 53 on the front side of the heat exchanger 52 is made of aluminum, which can quickly dissipate heat and prevent the cooling efficiency from decreasing due to excessively high temperature of the circulating cooling water.

[0034] Specifically, the air-cooling mechanism 6—secondary cooling + airflow directionality—prevents warping: The air-cooling mechanism 6 includes an air-cooled fan 62 fixedly connected to the top of the cooling box 2; exhaust dustproof nets 61 are fixedly connected to the front and rear inner walls of the cooling box 2; multiple guide plates 67 are fixedly connected to the front and rear inner walls of the cooling box 2; a filter plate 63 is detachably fixedly connected to the top of the air-cooled fan 62; a connecting ring 64 is fixedly sleeved on the outer side of the filter plate 63; four elastic claws 65 are fixedly connected to the bottom of the connecting ring 64; an annular retainer 66 is fixedly sleeved on the outer side of the air-cooled fan 62; the four elastic claws 65 are movably engaged with the outer side of the annular retainer 66; and a cooling temperature sensor 68 is fixedly connected to one inner wall of the cooling box 2.

[0035] Secondary air-cooling and shaping for thorough cooling: The rubber sheet, initially shaped by water cooling, enters the air-cooling zone of cooling box 2. The air-cooling fan 62 draws in outside air, which is filtered for dust by a stainless steel mesh filter before being blown onto the sheet surface. Multiple guide plates, made of PVC material and tilted at 30°, guide the airflow vertically onto the sheet, further reducing the temperature from 80°C to 25-30°C for thorough curing, preventing deformation and warping during subsequent cutting (≤0.5mm / m). The temperature sensor 68 measures the temperature of the foamed bottom of the cooled rubber sheet. If the temperature is too high, the power of the air-cooling mechanism 6 and the circulating water-cooling mechanism is increased through the control system; conversely, the power is reduced if the temperature is too low.

[0036] Dustproof and easy maintenance: The 6180 mesh nylon mesh exhaust dustproof net can prevent external dust from entering the cooling box 2 from the air outlet; the filter plate 63 is quickly engaged with the annular seat 66 through the elastic claw 65 of the connecting ring 64, which is made of 65Mn spring steel. Disassembly and cleaning do not require tools and maintenance time is short, avoiding the filter plate 63 from being blocked and causing the airflow to weaken.

[0037] Specifically, the end-to-end sealed design—preventing dust and interference—ensures cleanliness:

[0038] Cooling 2 Sealing: The partition 7 divides the cooling box 2 into a "water-cooled zone" and an "air-cooled zone". The right flexible PVC sealing curtain 8 at the bottom of the partition 7 can prevent airflow interference between the two zones and control the temperature difference within ±2℃. The sealing curtains at the inlet and outlet of the cooling box 2 can isolate workshop dust, so that the dust concentration in the cooling box is ≤0.1mg / m³ and the impurity adhesion rate on the surface of the rubber sheet is reduced to below 0.1%.

[0039] Foaming box 1 sealing: The left flexible PVC sealing curtain 47 at the inlet and outlet of the foaming chamber 46 can reduce heat loss and prevent volatile gases generated during the foaming process from spreading to the workshop, which meets the environmental protection standard GB4287-2012, and can also separate the sections so that they do not interfere with each other.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An automated processing line for homogenizing foamed rubber sheet bottoms, characterized in that, The assembly includes a foaming box (1), a cooling box (2), and a closed conveyor belt (3) between the foaming box (1) and the cooling box (2) of an automated processing line for rubber lightweight foamed bottoms. The foaming box (1) is equipped with a segmented foaming mechanism (4). A partition (7) is fixedly connected inside the cooling box (2). Two right flexible PVC sealing curtains (8) are fixedly connected to the bottom of the partition (7) and the top inner wall of the inlet and outlet of the cooling box (2). A circulating water cooling mechanism (5) is provided between the partition (7), the cooling box (2), and the foaming box (1). An air cooling mechanism (6) is provided between the partition (7) and the cooling box (2).

2. The automated processing line for homogenizing foamed rubber sheet bottoms according to claim 1, characterized in that, The segmented foaming mechanism (4) includes three foaming chambers (46) opened in the foaming box (1), multiple infrared heating tubes (45), three temperature sensors (42), three pressure sensors (44) and three circulating fans (43). The multiple infrared heating tubes (45) are respectively fixedly connected to the front and rear inner walls of the corresponding foaming chambers (46). The temperature sensors (42), the pressure sensors (44) and the circulating fans (43) are all fixedly connected to the top of the foaming chambers (46). The circulating fans (43) are connected to the foaming chambers (46). The front side of the circulating fans (43) is fixedly connected to a return pipe (41), and the rear end of the return pipe (41) is fixedly connected to the front side of the foaming chambers (46).

3. The automated processing line for homogenizing foamed rubber sheet bottoms according to claim 2, characterized in that, Two flexible PVC sealing curtains (47) are fixedly connected to the top inner walls of the two inlets and outlets on both sides of the foaming cavity (46).

4. The automated processing line for homogenizing foamed rubber sheet bottoms according to claim 1, characterized in that, The circulating water cooling mechanism (5) includes a heat-conducting box (56) fixedly connected to one side of the foaming box (1), a water pump (51) and a heat exchanger (52) fixedly connected to the front side of the first cooling box (2), and a second cooling box (58) fixedly connected inside the first cooling box (2). Multiple heat-conducting plates (59) are fixedly connected to the bottom of the second cooling box (58). The heat exchanger (52), the water pump (51) and the front side of the second cooling box (58) are connected in sequence. The heat exchanger (52) and the front side of the heat-conducting box (56) are fixedly connected by a return pipe (55). The heat-conducting box (56) and the rear side of the first cooling box (2) are fixedly connected by a water outlet pipe (57). The bottom of the multiple heat-conducting plates (59) is fixedly connected to the same heat-conducting silicone pad (50).

5. An automated processing line for homogenizing foamed rubber sheet bottoms according to claim 4, characterized in that, The heat-conducting box (56) is fixedly connected to an inlet valve and an outlet valve on one side.

6. The automated processing line for homogenizing foamed rubber sheet bottoms according to claim 4, characterized in that, A heat-conducting plate (53) is fixedly connected to the front side of the heat exchanger (52), and a plurality of heat dissipation fins (54) are fixedly connected to the front side of the heat-conducting plate (53).

7. The automated processing line for homogenizing foamed rubber sheet bottoms according to claim 1, characterized in that, The air-cooling mechanism (6) includes an air-cooling fan (62) fixedly connected to the top of the cooling box (2). Air outlet dustproof nets (61) are fixedly connected to the front and rear inner walls of the cooling box (2). Multiple guide plates (67) are fixedly connected to the front and rear inner walls of the cooling box (2). A filter plate (63) is detachably fixedly connected to the top of the air-cooling fan (62). A cooling temperature sensor (68) is fixedly connected to one side inner wall of the cooling box (2).

8. An automated processing line for homogenizing foamed rubber sheet bottoms according to claim 7, characterized in that, The filter plate (63) is fixedly fitted with a connecting ring (64) on the outside. The bottom of the connecting ring (64) is fixedly connected with four elastic claws (65). The air-cooled fan (62) is fixedly fitted with an annular seat (66) on the outside. The four elastic claws (65) are all movably engaged with the outside of the annular seat (66).

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