Rotational molding assembly line

Abstract

The invention discloses a rotational molding assembly line. The rotational molding assembly line comprises a base; the rotational molding trolley is arranged on the base, is movable and is used for mounting a workpiece to be machined; the drying oven unit is arranged on the base and is used for carrying out rotational molding processing on the workpiece to be processed on the rotational molding trolley; and the cooling unit is arranged on the base and used for cooling the machined part subjected to rotational molding. The method has the advantages that the unit time productivity is improved, the problems of uneven wall thickness, size deviation and the like caused by manual operation are reduced, the defective rate is reduced, energy waste is reduced, the smoothness of the whole process is improved, the labor cost is reduced, meanwhile, the influence of manual operation errors on the production progress is avoided, the universality and expansion capacity of equipment are improved, and the production efficiency is improved. And the production requirements of different scales are met.

Description

Technical Field

[0001] The present invention relates to the field of plastic processing, and in particular to a rotational molding production line. Background Art

[0002] In the field of plastic processing and manufacturing, rotational molding is widely used in industries such as water tanks, containers, and amusement facilities because it can produce large, complex-shaped, and uniformly thick plastic products. In the early days, rotational molding production was mainly based on single-machine operation, and the production process was discrete. Workers had to manually complete mold loading, transport the mold to the heating furnace, and manually unload the mold after cooling. Each link relied on manpower to connect. Under this model, production efficiency was extremely low, and the daily output of a single device was limited, which could not meet the needs of large-scale orders. In addition, manual operation errors were large, and the mold loading amount and heating time were not accurately controlled, resulting in frequent quality problems such as uneven wall thickness and dimensional deviation of the product, and the defective rate remained high, increasing the company's production costs. At the same time, when the single machine is in operation, the equipment operates independently, energy consumption is dispersed, and the heating furnace is frequently started. Stopping causes energy waste; in order to break through the bottleneck of a single machine, technical personnel in this field try to build a simple rotational molding production line, but on the one hand, the process planning is unreasonable, the functional division of the heating section, cooling section, loading and unloading section is vague, the process connection is not smooth, the mold is easily waiting and congested when transporting in each section, the production rhythm is chaotic, and the production capacity is difficult to release; and there is a lack of a buffer zone, which leads to a short-term failure in a certain section and causes the entire line to stagnate, and the production stability is poor; on the other hand, the equipment linkage is insufficient, and the operation rhythm of the rotational molding trolley does not match the heating and cooling process time. For example, heating requires precise temperature control for 16 minutes to fully plasticize the material. If the trolley's running speed is not coordinated with the heating cycle, it will cause uneven heating of the mold or energy waste, which will not only affect the quality of the product, but also increase production energy consumption.

[0003] Therefore, those skilled in the art are committed to providing a rotational molding line that can effectively solve the above technical problems. Summary of the Invention

[0004] To achieve the above-mentioned object, the present invention provides a rotational molding production line, comprising a base; A roto-molding trolley, which is movable on a base and used to mount workpieces to be processed; an oven unit, disposed on the base, for rotationally molding the workpieces on the rotationally molding trolley; The cooling unit is arranged on the base and is used to cool the rotationally molded workpiece.

[0005] Furthermore, the base is provided with an annular transfer track, and the rotational molding trolley moves on the base along the annular transfer track; The rotation molding trolley comprises a trolley frame, a moving wheel arranged at the lower end of the trolley frame and matched with the annular transfer track, a power unit arranged at one side of the trolley frame and used for driving the trolley frame to move along the annular transfer track, and a positioning assembly arranged on the trolley frame and used for positioning a workpiece to be processed.

[0006] Further, the positioning assembly comprises a temperature insulation plate, two vertical columns arranged at the upper end of the temperature insulation plate, a rotating arm arranged in the vertical column at the upper end of the vertical column and penetrating through the vertical column, and an arm head connected with each rotating arm, and two mold discs arranged at the outer end of the arm head and used for mounting the workpiece.

[0007] Further, a driving gear is arranged on the trolley frame, the driving gear is connected with the output end of a driving unit arranged on the trolley frame, the driving gear is engaged with a driven gear, the driven gear is sleeved on the lower end of a first transmission shaft, the upper half of the first transmission shaft rotates in the vertical column, a first bevel gear is arranged at the upper end of the first transmission shaft, the first bevel gear is engaged with a second bevel gear, the second bevel gear is sleeved on the outer side of a second transmission shaft, the middle section of the second transmission shaft rotates in the rotating arm, a third bevel gear is arranged on the inner side of the second transmission shaft in the arm head, the third bevel gear is engaged with a fourth bevel gear, the fourth bevel gear is sleeved on a third transmission shaft, the third transmission shaft rotates at the arm head and extends out of the arm head at both ends, and each mold disc is arranged at the two sides of the arm head and connected with the two ends of the third transmission shaft respectively.

[0008] Further, the mold disc comprises an outer circular ring, a rectangular reinforcing frame arranged in the outer circular ring, four corners of the rectangular reinforcing frame connected with the inner wall of the outer circular ring, an inner circular ring arranged in the rectangular reinforcing frame, and the rectangular reinforcing frame connected with the inner circular ring through a plurality of reinforcing rods.

[0009] Further, the oven unit comprises a plurality of oven assemblies and two buffer oven assemblies, each oven assembly is located between the two buffer oven assemblies, an isolation door is arranged at the connection between the inner side of the two buffer oven assemblies and the oven assemblies, oven doors are arranged at the outer sides of the two buffer oven assemblies, the plurality of oven assemblies are heating sections, the two buffer oven assemblies are respectively an entry buffer section and an exit buffer section, and the buffer section heating is independently controlled. The buffer oven assembly includes an oven, and the ovens of two adjacent oven assemblies are connected to each other. The bottom of each oven is provided with a support leg, and the lower end of each support leg is connected to the base. The bottom of the oven is provided with a through hole that passes through the oven, and the through holes on each oven are connected to each other to form a passage for the rotational molding trolley to pass through. The trolley frame is located below the oven; each oven is provided with a drying tunnel that passes through the oven, and each drying tunnel is provided with a burner; The buffer oven assembly has the same structure as the oven assemblies.

[0010] Furthermore, the cooling unit includes a cooling room and a pre-cooling area, the pre-cooling area is located at the input end of the cooling room, the cooling room is a segmented splicing structure, the annular transfer track runs through the cooling room, a number of rotational molding trolley stations are provided in the cooling room, a number of air vents are opened in the lower half of the cooling room, cooling fans used in conjunction with the air vents are provided on both sides of the cooling room, an exhaust duct is provided above the cooling room, and each exhaust duct is connected to the main pipeline at the same time.

[0011] Furthermore, it also includes upper and lower material sections, which are located at the input end of the oven unit and the output end of the cooling unit; Along the output end of the cooling unit to the input end of the oven unit, there are sequentially arranged a buffer preparation station, a first fixture removal station, a first robot grasping station, a second fixture removal station, a second robot grasping station, a first robot loading station, a first fixture loading station, a second robot loading station, a second fixture loading station and a maneuvering station.

[0012] Furthermore, the method further includes a circulating buffer section, and the annular transfer track also has a circulating buffer section, and the circulating buffer section is located between the maneuvering position and the vehicle entry buffer section.

[0013] Furthermore, it also includes a loading workshop arranged on the base, and internal material conveying lines are provided on both sides of the loading workshop, and the internal material conveying lines extend to the first manipulator loading station, the first fixture loading station, the second manipulator loading station and the second fixture loading station area, for conveying the workpieces to be processed to the loading and unloading sections; An external finished product conveyor line is provided on the outside of each of the internal incoming material conveyor lines, and each of the external finished product conveyor lines extends to the first fixture removal station, the first robot gripping station, the second fixture removal station and the second robot gripping station area, and is used to convey the processed workpieces.

[0014] The present invention has the following beneficial effects: 1. The continuous closed-loop operation of the rotational molding trolley is achieved through the circular transfer track. Combined with the coordinated layout of the oven unit, cooling unit and loading and unloading sections, an automated process of loading, heating, cooling and unloading is formed. The workstation cycle can be flexibly adapted to meet the different needs of annual production of 50,000, 80,000 and 100,000 pieces by adjusting the workstation cycle (for example, 320 seconds per trolley for 100,000 pieces and 640 seconds for 50,000 pieces). The total cycle time is stably controlled at around 20 minutes, greatly improving time and production capacity and breaking the efficiency bottleneck of traditional single-machine operation. 2. The positioning assembly precisely secures the workpiece through an outer ring, a rectangular reinforcement frame, and an inner ring. Simultaneously, through the linkage of multiple sets of bevel gears (the first to fourth bevel gears) and the drive shaft, the installed die plate drives the workpiece to rotate synchronously, ensuring uniform heating and consistent molding during the heating and cooling processes. This reduces problems such as uneven wall thickness and dimensional deviation caused by manual operation, thereby reducing the defective rate. 3. The oven unit adopts a segmented oven structure, with isolation doors and oven doors to reduce heat loss. The burner and variable frequency circulating fan work together to achieve efficient circulation of hot air, and the heating time is precisely controlled to 20 minutes, avoiding energy waste. The cooling unit uses several groups of forced air cooling fans and exhaust systems to complete workpiece shaping within 20 minutes, balancing cooling efficiency and energy consumption. Compared with the traditional single-unit frequent start-stop mode, this significantly reduces energy waste. 4. Set up inbound and outbound buffer sections and circulation buffer sections to coordinate the rhythm of heating, cooling, and loading and unloading to avoid a temporary failure in a certain section causing a stagnation of the entire line. The loading and unloading sections are connected in an orderly manner through multiple stations (such as fixture removal, robot grasping, assembly, etc.), combined with the material flow design of the internal incoming material and external finished product conveyor lines, to reduce process waiting and congestion, and improve the smoothness of the overall process; 5. Several manipulators complete loading and unloading, fixture installation and removal, and other operations, and cooperate with the power unit to drive the automatic transfer of the rotomolding trolley, reducing manual intervention. The linkage design between the loading workshop and the conveyor line realizes the automatic flow of workpieces to be processed and finished products, reducing labor costs and preventing the impact of human operation errors on production progress. 6. The drying oven of the drying unit and the cooling room of the cooling unit both adopt a segmented assembly structure. The number of heating stations (e.g., 3 heating stations for a production of 100,000 tons and 2 heating stations for a production of 50,000 tons) and cooling stations can be flexibly adjusted according to production requirements, thereby improving the versatility and scalability of the equipment to meet the production needs of different scales. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the locally enlarged structure at point A in the middle.

[0017] Figure 3 It is a structural schematic diagram of the oven unit in the present invention.

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 5 yes Figure 4 Schematic diagram of the locally enlarged structure at point B in the middle.

[0020] Figure 6 It is a structural schematic diagram of the cooling unit in the present invention.

[0021] Figure 7 yes Figure 6 Schematic diagram of the partially enlarged structure at point C in the middle.

[0022] Figure 8 yes Figure 6 Schematic diagram of the locally enlarged structure at point D in the middle.

[0023] Figure 9 It is a structural diagram of the rotationally molded car and other parts.

[0024] Figure 10 It is a structural diagram of the cooperation between the first bevel gear and the second bevel gear and other components.

[0025] Figure 11 yes Figure 10 Schematic diagram of the locally enlarged structure at point E in the middle.

[0026] Figure 12 It is a structural schematic diagram of components such as the column and the rotating arm in the present invention.

[0027] Figure 13 It is a structural schematic diagram of the mold tray installed in the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Base; 2. Roto-molding trolley; 3. Oven unit; 5. Cooling unit; 6. Annular transfer track; 7. Carriage; 8. Moving wheel; 9. Positioning assembly; 10. Insulation board; 11. Column; 12. Rotating arm; 13. Arm head; 15. Mould plate; 16. Driving gear; 17. Power unit; 18. Driven gear; 19. First transmission shaft; 20. First bevel gear; 21. Second bevel gear; 22. Second transmission shaft; 23. Third bevel gear; 25. Fourth bevel gear; 26. Third transmission shaft; 27. Outer ring; 28. Rectangular reinforcement frame; 29. ​​Reinforcement rod; 30. Inner ring; 31. Oven assembly; 32. Isolation door; 33. Buffer oven assembly; 33a. Inlet buffer section; 33b. Outlet Buffer section; 35. Oven; 36. Support legs; 37. Through-hole; 38. Oven tunnel; 39. Burner; 50. Cooling room; 51. Pre-cooling area; 52. Ventilation port; 53. Cooling fan; 55. Exhaust duct; 56. Main duct; 57. Loading and unloading section; 58. Buffer preparation station; 59. First fixture removal station; 60. First robot gripping station; 61. Second fixture removal station; 62. Second robot gripping station; 63. First robot assembly station; 64. First fixture assembly station; 65. Second robot assembly station; 66. Second fixture assembly station; 67. Maneuvering station; 70. Circulation buffer section; 71. Loading workshop; 72. Internal incoming material conveyor line; 73. External finished product conveyor line; 80. Oven door. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments: In the description of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] like Figures 1 to 13As shown, a rotational molding production line includes a base 1; The rotational molding trolley 2 is movably provided on the base 1 and is used for mounting the workpiece to be processed; An oven unit 3 is provided on the base 1 and is used for rotationally molding the workpiece on the rotationally molding trolley 2; The cooling unit 5 is provided on the base 1 and is used to cool the workpiece after the rotational molding process.

[0032] The base 1 is provided with an annular transfer track 6, and the rotational molding trolley 2 moves on the base 1 along the annular transfer track 6; The rotational molding trolley 2 includes a frame 7, and the lower end of the frame 7 is provided with a moving wheel 8 used in conjunction with the circular transfer track 6. A power unit 17 is provided on one side of the frame 7, and the power unit 17 is used to drive the frame 7 to move along the circular transfer track 6. A positioning component 9 is provided on the frame 7, and the positioning component 9 is used to position the workpiece to be processed.

[0033] The positioning assembly 9 includes a thermal insulation plate 10, and two columns 11 are provided at the upper end of the thermal insulation plate 10. A rotating arm 12 is provided at the upper end of the column 11 and is connected to the column 11. Each rotating arm 12 is connected to an arm head 13 at the same time, and mold plates for installing workpieces are provided on both sides of the outer end of the arm head 13.

[0034] The frame 7 is provided with a driving gear 16, and the driving gear 16 is connected to the output end of the drive unit installed at A1. In this embodiment, the drive unit is a motor, and the drive unit is provided on the frame 7. The driving gear 16 is meshed with a driven gear 18, and the driven gear 18 is sleeved on the lower end of the first transmission shaft 19. The upper half of the first transmission shaft 19 is rotated in the column 11, and a first bevel gear 20 is provided at the upper end. The first bevel gear 20 is meshed with a second bevel gear 21, and the second bevel gear 21 is sleeved. It is arranged on the outside of the second transmission shaft 22, and the middle section of the second transmission shaft 22 is rotatably located in the rotating arm 12. The inner side of the second transmission shaft 22 is provided with a third bevel gear 23 located in the arm head 13. The third bevel gear 23 is meshed with the fourth bevel gear 25. The fourth bevel gear 25 is sleeved on the third transmission shaft 26. The third transmission shaft 26 is rotatably installed at the arm head 13, and the two ends extend out of the arm head 13. Each of the die plates 15 is respectively located on both sides of the arm head 13 and is respectively connected to the two ends of the third transmission shaft 26. In this embodiment, as a preference, a triangular reinforcement rib can be added at the connection corner of the rectangular reinforcement frame 28 and the outer ring 27.

[0035] In the present invention, there are no special requirements for the structural features of the mold plate, and it can be designed as needed to meet the needs of supporting the mold and the product. The mold plate 15 in this embodiment includes but is not limited to an outer ring 27, and a rectangular reinforcement frame 28 is provided inside the outer ring 27. The four corners of the rectangular reinforcement frame 28 are connected to the inner wall of the outer ring 27, and an inner ring 30 is provided inside the rectangular reinforcement frame 28. The rectangular reinforcement frame 28 is connected to the inner ring 30 through a number of reinforcement rods 29.

[0036] The oven unit 3 includes several oven assemblies 31 and two oven buffer oven assemblies 33. Each oven assembly 31 is located between the two buffer oven assemblies 33. An isolation door 32 is provided at the connection between the inner side of the two buffer oven assemblies 33 and the oven assembly 31. The outer side of the two buffer oven assemblies 33 is provided with an oven door 80. Among them, several oven assemblies 31 are heating sections, and the two buffer oven assemblies 33 are respectively an inlet buffer section 33a and an outlet buffer section 33b. In this embodiment, the heating of the buffer sections is independently controlled.

[0037] The buffer oven assembly 33 includes an oven 35. The ovens 35 of two adjacent oven assemblies 31 are connected to each other. A support leg 36 is provided at the bottom of each oven 35. The lower end of each support leg 36 is connected to the base 1. A through-hole 37 is provided at the bottom of each oven 35, and the through-holes 37 on each oven 35 are connected to each other to form a passage for the rotational molding cart 2 to pass through. The cart frame 7 is located below the oven 35. A drying tunnel 38 is provided on each oven 35, which passes through the oven 35. A burner 39 is provided on each drying tunnel 38. The buffer oven assembly 33 has the same structure as the oven assemblies 31 .

[0038] The cooling unit 5 includes a cooling room 50 and a pre-cooling zone 51. The pre-cooling zone 51 is located at the input end of the cooling room 50. The cooling room 50 is a segmented splicing structure. The annular transfer track 6 runs through the cooling room 50. Several rotational molding trolley stations are provided in the cooling room 50. Several ventilation holes 52 are opened in the lower half of the cooling room 50. Cooling fans 53 used in conjunction with the ventilation holes 52 are provided on both sides of the cooling room 50. An exhaust duct 55 is provided above the cooling room 50. Each exhaust duct 55 is connected to the main pipeline 56 at the same time.

[0039] The present invention further includes an upper and lower material section 57, which is located at the input end of the oven unit 3 and the output end of the cooling unit 5; Along the output end of the cooling unit 5 to the input end of the oven unit 3, there are sequentially arranged a buffer preparation station 58, a first fixture removal station 59, a first robot grasping station 60, a second fixture removal station 61, a second robot grasping station 62, a first robot loading station 63, a first fixture loading station 64, a second robot loading station 65, a second fixture loading station 66 and a maneuverable station 67. Among them, the maneuverable station 67 can be set to a detection position according to specific needs when in use.

[0040] The circular transfer track 6 further includes a circulating buffer section 62 . The circular transfer track 6 further includes a circulating buffer section 70 . The circulating buffer section 70 is located between the maneuvering position 67 and the vehicle entry buffer section 33 a .

[0041] The present invention further includes a loading workshop 71 disposed on the base 1. Internal material conveying lines 72 are disposed on both sides of the loading workshop 71. The internal material conveying lines 72 extend to the first manipulator loading station 63, the first fixture loading station 64, the second manipulator loading station 65, and the second fixture loading station 66, and are used to convey the workpieces to be processed to the loading and unloading sections 57. An external finished product conveyor line 73 is provided on the outside of each of the internal incoming material conveyor lines 72, and each of the external finished product conveyor lines 73 extends to the first fixture removal station 59, the first robot grasping position 60, the second fixture removal station 61 and the second robot grasping position 62 area, for conveying the processed workpieces.

[0042] The present invention comprises a heating section (oven unit), a cooling section (cooling unit), a loading and unloading section, a circulation buffer section and a loading workshop 71. The rotational molding trolley runs on a circular transfer track 6 (in the present invention, the circular transfer track is a steel rail). The full circle is expected to take 20 minutes. In specific use, the number of roto-molding trolleys can be set according to actual conditions. In this embodiment, 15 roto-molding trolleys are set in the heating section, 15 roto-molding trolleys are set in the cooling section, 8 roto-molding trolleys are set in the loading and unloading sections, and 7 roto-molding trolleys are set in the buffer section, totaling 45 trolleys.

[0043] The optimal working principle of the present invention is as follows: The rotomolding trolley 2 moves in a closed loop along the circular transfer track 6 on the base 1. The moving wheels 8 are driven by the power unit 17, with a maximum travel speed of 30 meters per minute. The power is provided by a 380V 5-wire busbar. The entire line includes a heating section, a cooling section, a loading and unloading section, a circulating buffer section, and a loading room, forming a complete cycle of loading, heating, cooling, and unloading. The total cycle is adjusted according to the production demand (about 16 minutes per cycle for a production of 100,000, and a corresponding increase for a production of 50,000). The positioning assembly 9 of the rotational molding trolley 2 carries the workpiece through the mold plate 15. The mold plate 15 fixes the workpiece through the outer ring 27, the rectangular reinforcement frame 28 and the inner ring 30. The driving unit drives the driven gear 18 through the driving gear 16, transmits power through the first transmission shaft 19, and changes the transmission direction by the first bevel gear 20 and the second bevel gear 21. Then, the third transmission shaft 26 is driven to rotate through the second transmission shaft 22, the third bevel gear 23 and the fourth bevel gear 25, so that the mold plate 15 drives the workpiece to rotate synchronously during the processing to ensure uniform heating; the oven unit 3 consists of 1 The oven assembly consists of three oven assemblies 31 and two buffer oven assemblies 33. The buffer oven assembly is divided into an inlet buffer section 33a and an outlet buffer section 33b. The heat loss is reduced by the isolation door 32 and the oven door 80. The heat generated by the burner 39 enters the oven 35 through the drying tunnel 38. The circulating fan frequency conversion control realizes the hot air circulation. The insulation board 10 of the rotational molding trolley 2 enters the heating area through the through hole 37 at the bottom of the oven 35. The frame 7 is located under the oven 35. The heating time is fixed at 20 minutes to meet the material plasticization requirements. The heated workpiece first enters the pre-cooling zone 51 , and then enter the cooling room 50; the cooling room 50 contains 15 trolley stations, including 3 natural cooling stations and 12 forced air cooling stations. 13 groups of cooling fans 53 (a total of 26 2.2kw fans) deliver cold air through the vents 52, and 6 2.2kw exhaust fans exhaust hot air through the exhaust duct 55 and the main duct 56. The cooling time is 20 minutes to ensure that the workpiece is shaped; the loading and unloading section 57 is sequentially provided with a buffer preparation station 58, a first fixture removal station 59, a second fixture removal station 61, a first manipulator grasping station 60, and a second manipulator grasping station 62, the first manipulator loading station 63, the second manipulator loading station 65, the first fixture station 64, the second fixture station 66 and the mobile station 67, through 16 manipulators to complete the workpiece loading and unloading; the internal incoming material conveyor line 72 of the loading workshop 71 delivers the workpieces to be processed to the loading station, and the external finished product conveyor line 73 transports the finished products out, and the circulating buffer section 70 coordinates the rhythm of each process to avoid congestion; through the automated linkage of the above-mentioned processes, the present invention can realize the flexible production of 50,000, 80,000 and 100,000 products per year on the assembly line, taking into account both efficiency and product quality stability.

[0044] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A rotational molding production line, characterized in that: including a base (1); A rotational molding trolley (2) is movably arranged on the base (1) and is used for mounting the workpiece to be processed; an oven unit (3), arranged on the base (1), and used for performing rotational molding on the workpiece to be processed on the rotational molding trolley (2); A cooling unit (5) is provided on the base (1) and is used to cool the rotationally molded workpiece.

2. The rotational molding line according to claim 1, characterized in that: An annular transfer track (6) is provided on the base (1), and the rotational molding trolley (2) moves on the base (1) along the annular transfer track (6); The rotomolding trolley (2) comprises a frame (7), a moving wheel (8) for use with the annular transfer track (6) is provided at the lower end of the frame (7), a power unit (17) is provided on one side of the frame (7), and the power unit (17) is used to drive the frame (7) to move along the annular transfer track (6), and a positioning component (9) is provided on the frame (7), and the positioning component (9) is used to position the mold plate.

3. The rotational molding line according to claim 2, characterized in that: The positioning assembly (9) includes a heat-insulating plate (10), two columns (11) are provided at the upper end of the heat-insulating plate (10), and rotating arms (12) connected to the columns (11) are provided inside the upper ends of the columns (11). Each rotating arm (12) is simultaneously connected to an arm head (13), and mold plates (15) for mounting workpieces are provided on both sides of the outer ends of the arm head (13).

4. The rotational molding line according to claim 3, characterized in that: The frame (7) is provided with a driving gear (16), the driving gear (16) is connected to the output end of the driving unit (the driving unit is installed at A1), the driving unit is provided on the frame (7), the driving gear (16) is meshed with the driven gear (18), the driven gear (18) is sleeved on the lower end of the first transmission shaft (19), the upper half of the first transmission shaft (19) is rotatably located in the column (11), and a first bevel gear (20) is provided at the upper end, the first bevel gear (20) is meshed with the second bevel gear (21), the second bevel gear (21) is sleeved on the second transmission shaft ( The outer side of the second transmission shaft (22), the middle section of the second transmission shaft (22) is rotatably located in the rotating arm (12), the inner side of the second transmission shaft (22) is provided with a third bevel gear (23) located in the arm head (13), the third bevel gear (23) is meshed with the fourth bevel gear (25), the fourth bevel gear (25) is sleeved on the third transmission shaft (26), the third transmission shaft (26) is rotatably installed at the arm head (13), and both ends extend out of the arm head (13), each of the die plates (15) is respectively located on both sides of the arm head (13), and is respectively connected to both ends of the third transmission shaft (26).

5. The rotational molding line according to claim 4, characterized in that: The mold plate (15) includes an outer ring (27), a rectangular reinforcement frame (28) is provided inside the outer ring (27), four corners of the rectangular reinforcement frame (28) are connected to the inner wall of the outer ring (27), an inner ring (30) is provided inside the rectangular reinforcement frame (28), and the rectangular reinforcement frame (28) is connected to the inner ring (30) through a plurality of reinforcement rods (29).

6. The rotational molding line according to claim 5, characterized in that: The oven unit (3) comprises a plurality of oven assemblies (31) and two buffer oven assemblies (33), each oven assembly (31) being located between the two buffer oven assemblies (33), an isolation door (32) being provided at the connection between the inner sides of the two buffer oven assemblies (33) and the oven assembly (31), and an oven door (80) being provided on the outer sides of the two buffer oven assemblies (33), wherein the oven assembly (31) is a heating section, and the two buffer oven assemblies (33) are respectively an inlet buffer section (33a) and an outlet buffer section (33b), and the heating of the buffer sections is independently controlled; The buffer oven assembly (33) includes an oven (35), the ovens (35) of two adjacent oven assemblies (31) are connected to each other, the bottom of each oven (35) is provided with a support leg (36), the lower end of each support leg (36) is connected to the base (1), the bottom of the oven (35) is provided with a through-hole (37) passing through the oven (35), the through-holes (37) on each oven (35) are connected to each other to form a passage for the rotational molding trolley (2) to pass through, and the trolley frame (7) is located below the oven (35); each oven (35) is provided with a drying channel (38) passing through the oven (35), and each drying channel (38) is provided with a burner (39); The buffer oven assembly (33) has the same structure as each of the oven assemblies (31).

7. The rotational molding line according to claim 6, characterized in that: The cooling unit (5) includes a cooling room (50) and a pre-cooling zone (51), wherein the pre-cooling zone (51) is located at the input end of the cooling room (50), the cooling room (50) is a segmented splicing structure, the annular transfer track (6) runs through the cooling room (50), a plurality of rotational molding trolley stations are arranged in the cooling room (50), a plurality of ventilation openings (52) are opened in the lower half of the cooling room (50), cooling fans (53) used in conjunction with the ventilation openings (52) are arranged on both sides of the cooling room (50), an exhaust pipe (55) is arranged above the cooling room (50), and each exhaust pipe (55) is connected to the main pipeline (56) at the same time.

8. The rotational molding line according to claim 7, characterized in that: It also includes upper and lower material sections (57), the upper and lower material sections (57) being located at the input end of the drying oven unit (3) and the output end of the cooling unit (5); Along the output end of the cooling unit (5) to the input end of the oven unit (3), a buffer preparation station (58), a first fixture removal station (59), a first robot grasping station (60), a second fixture removal station (61), a second robot grasping station (62), a first robot loading station (63), a first fixture loading station (64), a second robot loading station (65), a second fixture loading station (66) and a maneuvering station (67) are sequentially arranged.

9. The rotational molding line according to claim 8, characterized in that: The said device further comprises a circulating buffer section (62), and the said circular transfer track (6) further comprises a circulating buffer section (70), wherein the said circulating buffer section (70) is located between the said maneuvering position (67) and the said vehicle entry buffer section (33a).

10. The rotational molding line according to claim 9, characterized in that: It also includes a loading workshop (71) arranged on the base (1), and internal material conveying lines (72) are provided on both sides of the loading workshop (71), and the internal material conveying lines (72) extend to the first manipulator loading station (63), the first fixture loading station (64), the second manipulator loading station (65) and the second fixture loading station (66) area, and are used to convey the workpiece to be processed to the loading and unloading sections (57); A finished product conveying line (73) is provided outside each of the incoming material conveying lines (72), and each of the outer finished product conveying lines (73) extends to the first fixture removal station (59), the first manipulator grasping position (60), the second fixture removal station (61) and the second manipulator grasping position (62) area for conveying the processed workpieces.

Images