PET foamed sheet rolling forming device

Abstract

A PET foamed sheet calendaring forming device comprises two calendaring rollers distributed in parallel, each calendaring roller comprises a rolling cylinder with an opening in one end and a positioning shaft installed in the rolling cylinder, a plurality of medium cavities are formed in each rolling cylinder, two second partition plates are fixedly arranged on the outer side wall of each positioning shaft, and a plurality of second partition plates are fixedly arranged on the outer side wall of each second partition plate. Each medium cavity is divided into a first heat exchange cavity and a second heat exchange cavity in the circumferential direction through the corresponding second partition plate, two cavities are adopted, electric heating parts are arranged in the second heat exchange cavities and used for heating heat conduction oil, the heated heat conduction oil is mixed with the heat conduction oil subjected to heat exchange and then pumped into the first heat exchange cavities, and the second heat exchange cavities are communicated with the first heat exchange cavities. The mixed oil liquid participates in heat exchange in the foaming material rolling and pressing process, higher-precision temperature control can be achieved through the proportion of the mixed oil liquid, and meanwhile compared with an external electric heating mode, oil way distribution can be reduced, heat energy loss can be reduced, and heat efficiency can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of foaming and forming, and in particular relates to a PET foaming plate calendering and forming device. Background Art

[0002] PET foam material is a new type of high-performance green recyclable lightweight material made from polyethylene terephthalate (PET) through a foaming process. It has excellent thermal stability, fatigue resistance, thermal insulation, flame retardancy, low smoke and non-toxicity, and environmental friendliness. It is widely used in wind power, rail transportation, aerospace, shipbuilding and other fields, and plays an important role as a structural core material and sandwich material. Among them, after extrusion, the PET foam sheet uses a calender to calender the extruded PET foam material into a uniform sheet. During the calendering process, the roller is a component that directly contacts and handles the material, and its temperature stability has a decisive influence on the quality of the product. By accurately controlling the temperature of the roller, it can be ensured that the calendering process is carried out in a stable temperature environment, thereby improving the quality and consistency of the product.

[0003] At present, the cavity of the roller of the calendering machine is filled with a heat-conducting medium, and an electric heating component is installed inside the roller. The heat-conducting medium is heated to a set temperature by the electric heating component to heat the roller. However, the temperature may be uneven. The temperature of the area close to the electric heating component is relatively high, while the temperature of the remaining areas is relatively low. In addition, since the temperature of the electric heating component changes slowly, temperature adjustment is not convenient. Therefore, a calendering forming device with a roller that can adjust the temperature with high precision is urgently needed. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention creatively adopts a PET foam board calendering molding device to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted is as follows: The present invention proposes a PET foam board calendering molding device, comprising two parallel calendering rollers, both of which are rotatably mounted on a frame, and both of which are equipped with a driving motor capable of driving the calendering rollers to rotate, so that the two calendering rollers can rotate relative to each other to calender the foam material into a board body; The calendering roller comprises a roller cylinder with an opening at one end and a positioning shaft installed inside the roller cylinder, the roller cylinder can be driven by the driving motor to rotate outside the positioning shaft, and at least one first partition is fixed on the outer wall of the positioning shaft in the axial direction, and the first partition divides the inner cavity of the roller cylinder into a plurality of medium cavities; Two second partitions are fixedly provided on the outer side wall of the positioning shaft, and the second partitions divide each of the medium cavities in the circumferential direction into a first heat exchange cavity and a second heat exchange cavity. Along the axial direction, the two ends of the positioning shaft corresponding to each of the medium cavities are respectively provided with a first guide hole and a second guide hole for connecting the first heat exchange cavity and the second heat exchange cavity, and a third guide hole is provided between the first guide hole and the second guide hole. A pump valve is installed in the positioning shaft, and the pump valve is configured to extract heat transfer medium from the first guide hole or the third guide hole and transport it to the first heat exchange cavity.

[0006] Furthermore, a temperature sensor is provided in the first heat exchange chamber, and an electric heating component is provided in the second heat exchange chamber. The pump valve can adjust the proportion of the heat transfer medium extracted from the first flow guide hole or the third flow guide hole according to the detection value of the temperature sensor and the target temperature value, so that the temperature of the heat transfer medium delivered to the first heat exchange chamber reaches the target temperature value.

[0007] Furthermore, a radial partition plate and a first axial partition plate are provided inside the first heat exchange chamber, and the radial partition plate is fixedly connected to the inner walls of two second partitions and two first partitions adjacent to each other in the axial direction on all sides, so that a contact chamber is formed between the radial partition plate and the rolling cylinder, and the first axial partition plate is fixedly connected to the outer wall of the positioning shaft, the inner wall of the radial partition plate and the inner walls of the two first partitions on all sides, and a mixing liquid supply chamber connected to the first guide hole and a reflux chamber connected to the second guide hole are axially separated between the radial partition plate and the positioning shaft, a first plate hole connecting the mixing liquid supply chamber and the contact chamber is provided on the radial partition plate, and a second plate hole connecting the contact chamber and the reflux chamber is provided on the radial partition plate.

[0008] Furthermore, a first guide plate is provided inside the mixed liquid supply chamber along the direction from the first guide hole to the first plate hole, so that the heat transfer medium flowing out of the first guide hole flows to the first plate hole after being guided by the first guide plate. The first guide plate is arranged on the connecting line between the first guide hole and the first plate hole, and is constructed as an arc-shaped plate.

[0009] Furthermore, the volume ratio of the reflux chamber to the mixing liquid supply chamber is greater than 1, and along the axial direction, the distance between the radial partition plate and the inner wall of the rolling cylinder is equal, or from the first plate hole to the second plate hole, the distance between the radial partition plate and the inner wall of the rolling cylinder gradually decreases, and the angle between the two second partitions is set at 120°-180°.

[0010] Furthermore, a second axial partition plate is provided inside the second heat exchange chamber, and the second axial partition plate is configured as a fan-shaped plate, and the second axial partition plate is fixed on the outer wall of the positioning shaft, and the two sides of the second axial partition plate are respectively fixedly connected to the two first partition plates, and the second heat exchange chamber is divided in the axial direction into a heating chamber and a liquid supply chamber that are interconnected, wherein the heating chamber is located on one side of the first guide hole, and the liquid supply chamber is located on one side of the second guide hole.

[0011] Furthermore, a second guide plate is provided inside the liquid supply chamber along the direction from the second guide hole to the heating chamber, so that the heat-conducting medium flowing out of the second guide hole flows into the heating chamber after being guided by the second guide plate, and the second guide plate is constructed as an arc-shaped plate. The second guide plate is arranged in multiple layers from the inside to the outside along the radial direction, and a tortuous channel for the heat-conducting medium to flow is formed between the multiple layers of the second guide plates.

[0012] Furthermore, the volume ratio of the liquid supply chamber to the heating chamber is greater than 1, and the surface of the second guide plate is fixedly provided with the electric heating component, and the electric heating component includes an electric heating wire or an electric heating film.

[0013] Furthermore, the first heat exchange chambers in the two rolling cylinders are both oriented toward the gap between the two rolling cylinders, and the two first heat exchange chambers are symmetrically distributed along the direction of the connecting line of the rotation axes of the two rolling cylinders.

[0014] Furthermore, end caps are installed on the two axial ends of the calendering roller corresponding to the outer side of the frame, and a lifting rod is installed between the two end caps on the same side. The lifting rod is connected to the external control system and is used to adjust the distance between the two calendering rollers.

[0015] The beneficial effects achieved by the present invention are as follows: The present invention adopts two chambers, wherein an electric heating component is arranged in the second heat exchange chamber for heating the heat transfer oil. The heated heat transfer oil is mixed with the heat transfer oil after heat exchange and then pumped into the first heat exchange chamber to participate in the heat exchange during the foaming material rolling process. By adjusting the ratio of the mixed oil, higher precision temperature control can be achieved. At the same time, compared with the external electric heating method, the oil circuit distribution can be reduced, the heat energy loss can be reduced, and the thermal efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a PET foam plate calendering molding device proposed in an embodiment of the present invention; Figure 2 A schematic side view of a PET foam plate calendering forming device according to an embodiment of the present invention; Figure 3 A schematic diagram of the three-dimensional structure of a calendering roller is provided for an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the half-section structure; Figure 5 A schematic diagram of the internal structure of a calendering roller is provided for an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along the AA direction; Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure along the BB direction; Figure 8 The present invention provides a schematic diagram of the rolling state of the calendering roller.

[0017] Among them, 001, calendering roller; 002, frame; 003, end cap; 004, lifting rod; 005, driving motor; 10, rolling cylinder; 100, medium cavity; 11, power shaft; 20, positioning shaft; 201, first guide hole; 202, second guide hole; 203, third guide hole; 21, end cover; 22, end cap shaft; 30, first partition plate; 31, second partition plate; 40, pump valve; 50, first heat exchange cavity; 501, mixing liquid supply cavity; 502, contact cavity; 503, reflux cavity; 51, radial partition plate; 511, first plate hole; 512, second plate hole; 52, first axial partition plate; 53, first guide plate; 60, second heat exchange cavity; 601, heating cavity; 602, liquid supply cavity; 61, second axial partition plate; 62, second guide plate.

[0018] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0021] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a PET foam board rolling forming device is provided, which aims to improve the accuracy of roller temperature control. The device mainly includes two parallelly distributed rolling rollers 001, and the two rolling rollers 001 are both rotatably installed on the frame 002. The two rolling rollers 001 are both equipped with a driving motor 005 that can drive the rolling rollers 001 to rotate, so that the two rolling rollers 001 can rotate relative to each other to roll the foam material into a board body.

[0022] Furthermore, end caps 003 are installed on the outer sides of the two axial ends of the calendering roller 001 corresponding to the frame 002, and a lifting rod 004 is installed between the two end caps 003 on the same side. The lifting rod 004 is connected to the external control system and is used to adjust the distance between the two calendering rollers 001.

[0023] In some embodiments, the end cap 003 is constructed as a cylindrical cap structure with holes, and the calendering roller 001 can rotate in the end cap 003. The end cap 003 is mainly used to control the distance between the two calendering rollers 001 through the lifting rod 004. The lifting rod 004 is electrically or hydraulically controlled. The two lifting rods 004 are raised and lowered synchronously. The driving motor 005 is a servo motor. The precise control function of the servo motor is used to realize the synchronous drive of the two calendering rollers 001 through programming and control algorithms. The servo motor control system can monitor the speed and position information of the two calendering rollers 001 in real time, and adjust them as needed to ensure that they always keep in sync.

[0024] like Figure 3 and Figure 4 As shown, the rolling roller 001 includes a rolling cylinder 10 with an opening at one end and a positioning shaft 20 installed inside the rolling cylinder 10, wherein a power shaft 11 is fixedly arranged on the side of the rolling cylinder 10 away from the open end, and the output end of the driving motor 005 is transmission-connected to the power shaft 11, so that the rolling cylinder 10 can be driven by the driving motor 005 to rotate outside the positioning shaft 20.

[0025] Furthermore, the positioning shaft 20 is provided with an end cover 21 at the open end of the rolling cylinder 10 for sealing the opening of the rolling cylinder 10, and an end cap shaft 22 is provided on the outer side of the end cover 21 so that the end cap shaft 22 can be rotatably mounted on the end cap 003 to adjust the spacing between the two calendering rollers 001. At least one first partition 30 is fixed along the axial direction on the outer side wall of the positioning shaft 20, and the first partition 30 divides the inner cavity of the rolling cylinder 10 into a plurality of medium cavities 100. Two second partitions 31 are fixedly provided on the outer side wall of the positioning shaft 20, and the second partitions 31 separate each medium cavity 100. The cavity 100 is divided into a first heat exchange cavity 50 and a second heat exchange cavity 60 in the circumferential direction. Along the axial direction, the two ends of each medium cavity 100 on the positioning shaft 20 are respectively provided with a first guide hole 201 and a second guide hole 202 for connecting the first heat exchange cavity 50 and the second heat exchange cavity 60. A third guide hole 203 is provided between the first guide hole 201 and the second guide hole 202. A pump valve 40 is installed in the positioning shaft 20. The pump valve 40 is configured to extract heat transfer medium from the first guide hole 201 or the third guide hole 203 and transport it to the first heat exchange cavity 50.

[0026] In this way, the roller cylinder 10 is divided into a plurality of medium chambers 100 by the first partition plate 30 , and each medium chamber 100 can be filled with a heat-conducting medium (thermal oil can be selected), thereby avoiding the temperature drop caused by the excessively long path of the thermal oil in the axial direction.

[0027] Furthermore, a temperature sensor is provided in the first heat exchange chamber 50, and an electric heating component is provided in the second heat exchange chamber 60. The pump valve 40 can adjust the proportion of the heat transfer medium extracted from the first flow guide hole 201 or the third flow guide hole 203 according to the detection value of the temperature sensor and the target temperature value, so that the temperature of the heat transfer medium delivered to the first heat exchange chamber 50 reaches the target temperature value.

[0028] In some embodiments, since the temperature of the heat-conducting medium on one side of the third flow guide hole 203 is lower than that on the other side, the pump valve 40 can adopt a double-inlet and single-outlet pump valve 40, so that one side of the first heat exchange chamber 50 is close to the rolling direction of the foaming material, so that the heat-conducting medium in the first heat exchange chamber 50 is directly in contact with the roller cylinder 10 and the part of the foaming material that is in contact with the rolling material, so as to ensure that the heat-conducting medium in the first heat exchange chamber 50 is within the set target temperature value. When the target temperature value changes, the proportion of the heat-conducting medium extracted from the first flow guide hole 201 or the third flow guide hole 203 can be adjusted to make the temperature of the heat-conducting medium delivered to the first heat exchange chamber 50 reach the target temperature value.

[0029] like Figure 4 and Figure 5 As shown, a radial partition plate 51 and a first axial partition plate 52 are provided inside the first heat exchange chamber 50 .

[0030] The radial partition plate 51 is fixedly connected around the inner walls of two second partition plates 31 and two first partition plates 30 adjacent to each other in the axial direction, so that a contact cavity 502 is formed between the radial partition plate 51 and the rolling cylinder 10 .

[0031] Furthermore, the first axial partition plate 52 is fixedly connected to the outer wall of the positioning shaft 20, the inner wall of the radial partition plate 51 and the inner walls of the two first partition plates 30 on all sides, and a mixing liquid supply chamber 501 connected to the first guide hole 201 and a reflux chamber 503 connected to the second guide hole 202 are axially separated between the radial partition plate 51 and the positioning shaft 20. The radial partition plate 51 is provided with a first plate hole 511 connecting the mixing liquid supply chamber 501 and the contact chamber 502, and the radial partition plate 51 is provided with a second plate hole 512 connecting the contact chamber 502 and the reflux chamber 503.

[0032] In some embodiments, the radial partition plate 51 is constructed as an arc-shaped plate, and the first axial partition plate 52 is constructed as a fan-shaped plate. The radial partition plate 51 and the first axial partition plate 52 divide the first heat exchange chamber 50 into a mixed liquid supply chamber 501, a contact chamber 502 and a reflux chamber 503. When in use, the pump valve 40 introduces the heat transfer oil from the first guide hole 201 into the mixed liquid supply chamber 501, so that the heat transfer oils with different temperatures are mixed evenly in the mixed liquid supply chamber 501 and then introduced into the contact chamber 502. The temperature in the contact chamber 502 is fed back through a temperature sensor. If the temperature cannot reach the target temperature, the proportion of the mixed heat transfer oil with a high temperature is increased so that the heat transfer oil in the contact chamber 502 reaches the target temperature. After heat exchange, the temperature of the heat transfer oil in the contact chamber 502 decreases and flows into the reflux chamber 503, and finally flows into the second heat exchange chamber 60 for heating or remixing with relatively hot heat transfer oil, and then enters the mixed liquid supply chamber 501 again.

[0033] like Figure 6 and Figure 8 As shown, further, a first guide plate 53 is provided inside the mixed liquid supply chamber 501 along the direction from the first guide hole 201 to the first plate hole 511, so that the heat transfer medium flowing out of the first guide hole 201 flows to the first plate hole 511 after being guided by the first guide plate 53. The first guide plate 53 is arranged on the connecting line of the first guide hole 201 and the first plate hole 511, and is constructed as an arc plate. In this way, the cold and hot mixed heat transfer oils can be fully mixed in the mixed liquid supply chamber 501 after being guided by the first guide plate 53, so that the temperature of the mixed oil is more uniform.

[0034] In some embodiments, the volume ratio of the reflux chamber 503 to the mixing supply chamber 501 is greater than 1, so that the volume of the reflux chamber 503 is larger than the volume of the mixing supply chamber 501, so as to reduce the residence time of the mixed oil in the mixing supply chamber 501, keep the oil quickly entering the contact chamber 502 to participate in heat exchange, and extend the residence time of the oil after heat exchange in the reflux chamber 503.

[0035] Furthermore, along the axial direction, the distance between the radial partition plate 51 and the inner wall of the rolling cylinder 10 is equal, or from the first plate hole 511 to the second plate hole 512, the distance between the radial partition plate 51 and the inner wall of the rolling cylinder 10 gradually decreases. When the distance between the radial partition plate 51 and the inner wall of the rolling cylinder 10 is equal, the flow rate of the heat transfer oil in the contact chamber 502 is uniform. When the distance between the radial partition plate 51 and the inner wall of the rolling cylinder 10 gradually decreases, the flow rate of the heat transfer oil in the contact chamber 502 gradually increases, prompting the heat transfer oil after heat exchange to flow to the reflux chamber 503, avoiding a large temperature difference of the heat transfer oil in the axial direction of the contact chamber 502, and the angle between the two second partitions 31 is set at 120°-180°.

[0036] Furthermore, a second axial partition plate 61 is provided inside the second heat exchange chamber 60, and the second axial partition plate 61 is constructed as a fan-shaped plate. The second axial partition plate 61 is fixed on the outer wall of the positioning shaft 20, and the two sides of the second axial partition plate 61 are respectively fixedly connected to the two first partitions 30, and the second heat exchange chamber 60 is divided in the axial direction to form a heating chamber 601 and a liquid supply chamber 602 that are interconnected, wherein the heating chamber 601 is located on one side of the first guide hole 201, and the liquid supply chamber 602 is located on one side of the second guide hole 202.

[0037] Furthermore, Figure 7 and Figure 8 As shown, a second guide plate 62 is provided inside the liquid supply chamber 602 along the direction from the second guide hole 202 to the heating chamber 601, so that the heat-conducting medium flowing out of the second guide hole 202 flows into the heating chamber 601 after being guided by the second guide plate 62. The second guide plate 62 is constructed as an arc-shaped plate. The second guide plate 62 is provided with multiple layers from the inside to the outside along the radial direction, and a tortuous channel for the heat-conducting medium to flow is formed between the multiple layers of the second guide plates 62. The volume ratio of the liquid supply chamber 602 and the heating chamber 601 is greater than 1. An electric heating component is fixedly provided on the surface of the second guide plate 62, and the electric heating component includes an electric heating wire or an electric heating film.

[0038] In this way, the coolant after heat exchange that flows into the liquid supply chamber 602 from the second guide hole 202 is guided by the multi-layer second guide plate 62 and contacts the electric heating components on the second guide plate 62, and is reheated, so that the heat transfer oil in the liquid supply chamber 602 can be heated to the target temperature or a state slightly higher than the target temperature, and then enters the heating chamber 601, and is sucked by the pump valve 40 through the first guide hole 201 and introduced into the first heat exchange chamber 50.

[0039] Compared with heating the heat transfer oil by electric heating in a single chamber, the present invention adopts two chambers, wherein an electric heating component is arranged in the second heat exchange chamber 60 for heating the heat transfer oil. The heated heat transfer oil is mixed with the heat transfer oil after heat exchange and then pumped into the first heat exchange chamber 50 to participate in the heat exchange of the foaming material during the rolling process. Through the proportion of the mixed oil, higher precision temperature control can be achieved. At the same time, compared with the external electric heating method, the oil circuit distribution can be reduced, the heat energy loss can be reduced, and the thermal efficiency can be improved.

[0040] like Figure 8 As shown, the first heat exchange chambers 50 in the two roller cylinders 10 are both oriented toward the gap between the two roller cylinders 10, and the two first heat exchange chambers 50 are symmetrically distributed along the direction of the connecting line of the rotating axes of the two roller cylinders 10. In this way, parts of the two first heat exchange chambers 50 are located in the part where the roller cylinder 10 contacts the foaming material, so that the heat transfer oil in the first heat exchange chamber 50 can be temperature-controlled with high precision.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A PET foam sheet rolling forming device, characterized in that: The invention comprises two parallel calendering rollers (001), the two calendering rollers (001) are both rotatably mounted on a frame (002), and the two calendering rollers (001) are both mounted with a driving motor (005) capable of driving the calendering rollers (001) to rotate, so that the two calendering rollers (001) can rotate relative to each other to calender the foaming material into a plate body; The calendering roller (001) comprises a rolling cylinder (10) having an opening at one end and a positioning shaft (20) installed inside the rolling cylinder (10); the rolling cylinder (10) can be driven by the driving motor (005) to rotate outside the positioning shaft (20); at least one first partition plate (30) is fixed on the outer wall of the positioning shaft (20) along the axial direction; the first partition plate (30) divides the inner cavity of the rolling cylinder (10) into a plurality of medium cavities (100); Two second partitions (31) are fixedly provided on the outer wall of the positioning shaft (20), and the second partitions (31) divide each medium cavity (100) in the circumferential direction into a first heat exchange cavity (50) and a second heat exchange cavity (60). In the axial direction, two ends of the positioning shaft (20) corresponding to each medium cavity (100) are respectively provided with a first guide hole (201) and a second guide hole (202) for connecting the first heat exchange cavity (50) and the second heat exchange cavity (60), and a third guide hole (203) is provided between the first guide hole (201) and the second guide hole (202). A pump valve (40) is installed in the positioning shaft (20), and the pump valve (40) is configured to extract heat transfer medium from the first guide hole (201) or the third guide hole (203) and transport it to the first heat exchange cavity (50).

2. The PET foam sheet rolling forming device according to claim 1, characterized in that: A temperature sensor is provided in the first heat exchange chamber (50), and an electric heating component is provided in the second heat exchange chamber (60). The pump valve (40) can adjust the proportion of the heat transfer medium extracted from the first flow guide hole (201) or the third flow guide hole (203) according to the detection value of the temperature sensor and the target temperature value, so that the temperature of the heat transfer medium transported to the first heat exchange chamber (50) reaches the target temperature value.

3. The PET foam sheet rolling forming device according to claim 2, characterized in that: A radial partition plate (51) and a first axial partition plate (52) are provided inside the first heat exchange chamber (50); the radial partition plate (51) is fixedly connected to two second partition plates (31) and inner walls of two first partition plates (30) adjacent to each other in the axial direction on all sides, so that a contact chamber (502) is formed between the radial partition plate (51) and the rolling cylinder (10); the first axial partition plate (52) is fixedly connected to the outer wall of the positioning shaft (20), the inner wall of the radial partition plate (51) and the inner walls of the two first partition plates (30) on all sides. The inner wall is fixedly connected, and a mixing liquid supply chamber (501) communicating with the first guide hole (201) and a reflux chamber (503) communicating with the second guide hole (202) are separated axially between the radial partition plate (51) and the positioning shaft (20); a first plate hole (511) for connecting the mixing liquid supply chamber (501) and the contact chamber (502) is provided on the radial partition plate (51); and a second plate hole (512) for connecting the contact chamber (502) and the reflux chamber (503) is provided on the radial partition plate (51).

4. The PET foam sheet calendering molding device according to claim 3, characterized in that: A first guide plate (53) is provided inside the mixed liquid supply chamber (501) along the direction from the first guide hole (201) to the first plate hole (511), so that the heat transfer medium flowing out of the first guide hole (201) flows to the first plate hole (511) after being guided by the first guide plate (53); the first guide plate (53) is arranged on a line connecting the first guide hole (201) and the first plate hole (511) and is constructed as an arc-shaped plate.

5. The PET foam board calendering molding device according to claim 3, characterized in that: The volume ratio of the reflux chamber (503) to the mixed liquid supply chamber (501) is greater than 1, and along the axial direction, the distance between the radial partition plate (51) and the inner wall of the roller cylinder (10) is equal, or from the first plate hole (511) to the second plate hole (512), the distance between the radial partition plate (51) and the inner wall of the roller cylinder (10) gradually decreases, and the angle between the two second partition plates (31) is set at 120°-180°.

6. The PET foam board calendering molding device according to claim 2, characterized in that: A second axial partition plate (61) is provided inside the second heat exchange chamber (60), and the second axial partition plate (61) is constructed as a fan-shaped plate. The second axial partition plate (61) is fixed on the outer wall of the positioning shaft (20), and the two sides of the second axial partition plate (61) are respectively fixedly connected to the two first partition plates (30), and the second heat exchange chamber (60) is divided in the axial direction to form a heating chamber (601) and a liquid supply chamber (602) that are interconnected, wherein the heating chamber (601) is located on one side of the first guide hole (201), and the liquid supply chamber (602) is located on one side of the second guide hole (202).

7. The PET foam board calendering molding device according to claim 6, characterized in that: A second guide plate (62) is provided inside the liquid supply chamber (602) along the direction from the second guide hole (202) to the heating chamber (601), so that the heat-conducting medium flowing out of the second guide hole (202) flows into the heating chamber (601) after being guided by the second guide plate (62). The second guide plate (62) is constructed as an arc-shaped plate. The second guide plates (62) are arranged in multiple layers from the inside to the outside in the radial direction, and a tortuous channel for the heat-conducting medium to flow is formed between the multiple layers of the second guide plates (62).

8. The PET foam board calendering molding device according to claim 7, characterized in that: The volume ratio of the liquid supply chamber (602) to the heating chamber (601) is greater than 1, and the surface of the second guide plate (62) is fixedly provided with the electric heating component, which includes an electric heating wire or an electric heating film.

9. The PET foam board calendering molding device according to any one of claims 1 to 8, characterized in that: The first heat exchange chambers (50) in the two roller cylinders (10) are both oriented towards the gap between the two roller cylinders (10), and the two first heat exchange chambers (50) are symmetrically distributed along the direction of the connecting line of the rotation axes of the two roller cylinders (10).

10. The PET foam board calendering molding device according to claim 1, characterized in that: End caps (003) are installed at the two axial ends of the calendering roller (001) corresponding to the outer sides of the frame (002), and a lifting rod (004) is installed between the two end caps (003) on the same side. The lifting rod (004) is connected to an external control system and is used to adjust the distance between the two calendering rollers (001).

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