Cooling and drying joint production system for EPP (Expanded Polypropylene) forming part

Abstract

The utility model discloses an EPP formed part cooling and drying joint production system which comprises a spraying room and a drying room, and the spraying room is provided with a spraying frame used for spraying water to cool an undemoulded EPP formed part and a first water collecting pool used for collecting spraying water; the drying room comprises an air supply assembly used for supplying air to the drying room to dry the demolded EPP formed part and a heat exchanger used for heating cold air introduced by the air supply assembly into hot air. The first water collecting tank is provided with a first water outlet, the heat exchanger is provided with a heat exchanger inlet, the first water outlet is communicated with the heat exchanger inlet, and spray water collected by the first water collecting tank can be driven to enter the heat exchanger and exchanges heat with cold air introduced by the air supply assembly; the air supply assembly and the heat exchanger are arranged in the drying room, and meanwhile the first water collecting pool is arranged to collect spraying water and convey the spraying water to the heat exchanger to serve as a hot working medium to heat cold air so as to achieve the purpose of drying EPP formed parts through hot air. The waste heat of the cooling water is effectively utilized, the production cost is reduced, and the resource utilization rate is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of EPP material molding, and relates to a combined production system for cooling and drying EPP molded parts. Background Art

[0002] EPP (Expanded polypropylene), also known as expanded polypropylene, is the abbreviation of a new type of foam plastic. EPP polypropylene plastic foam material is a highly crystalline polymer / gas composite material with excellent performance. With its unique and superior performance, it has become the fastest growing environmentally friendly new type of pressure-resistant buffering and heat-insulating material. EPP is also an environmentally friendly material that can be recycled and reused. Compared with EPS (expanded polystyrene), EPP has higher mechanical strength, which greatly expands the application scenarios of foam plastics. The EPP raw material needs to be initially formed by high-temperature foaming in the mold, and then the entire mold is cooled and demolded to obtain the EPP molded part. In the common molding and production process of EPP materials, cooling and demolding are mostly carried out by water cooling, which results in a large amount of water stains remaining on the surface of the EPP molded parts after demolding. Therefore, a corresponding drying room is required to dry the EPP molded parts.

[0003] At present, domestic EPP molding workshops use new steam from molding boilers to bake and shape EPP products, which consumes a lot of energy and has high production costs. The temperature of the cooling water during demoulding of EPP molded parts will rise to about 70°C after cooling the EPP molded parts. The heated cooling water needs to be cooled before the next cycle of cooling can be carried out, which results in waste of waste heat of cooling water and increases production costs.

[0004] In order to solve the above problems, a production system is needed that can effectively utilize the waste heat of cooling water as a heat source in a drying room to heat and dry EPP molded parts, so as to reduce production costs and improve resource utilization. Utility Model Content

[0005] In view of this, the present invention provides a combined production system for cooling and drying EPP molded parts. An air supply component and a heat exchanger are arranged in the drying room. At the same time, a first water collection tank is arranged to collect spray water and transport it to the heat exchanger as a hot medium to heat cold air to achieve the purpose of hot air drying EPP molded parts. This system effectively utilizes the waste heat of cooling water, reduces production costs, and improves resource utilization.

[0006] The utility model discloses a combined production system for cooling and drying EPP molded parts, comprising:

[0007] A spray room, wherein the spray room is provided with a spray rack for spraying water to cool down the undemolded EPP molded parts and a first water collection tank for collecting the spray water;

[0008] A drying room, the drying room comprising an air supply assembly for supplying air to the drying room to dry the demoulded EPP molded parts and a heat exchanger for heating the cold air introduced by the air supply assembly into hot air;

[0009] The first water collecting tank is provided with a first water outlet, the heat exchanger has a heat exchanger inlet, the first water outlet is communicated with the heat exchanger inlet, and the spray water collected in the first water collecting tank can be driven into the heat exchanger and perform heat exchange with the cold air introduced by the air supply component.

[0010] Furthermore, it also includes a cooling water pool, the cooling water pool has a cooling water return pipe and a cooling water outlet pipe, the spray rack is provided with a spray water inlet pipe, the heat exchanger is provided with a heat exchanger outlet, the cooling water outlet pipe is connected to the spray water inlet pipe, and the heat exchanger outlet is connected to the cooling water return pipe.

[0011] Furthermore, the spray room also includes a spray room body and a middle partition, at least two middle partitions are provided, the two middle partitions are arranged in parallel in the spray room body and divide the spray room body into a primary spray room, a secondary spray room and a tertiary spray room, the spray rack is installed in the spray room body and passes through the primary spray room, the secondary spray room and the tertiary spray room, the first water collecting tank is arranged at the bottom of the primary spray room for collecting the spray water of the primary spray room; the spray room body is also provided with a second water collecting tank, the second water collecting tank is located at the bottom of the secondary spray room and the tertiary spray room for collecting the spray water of the spray room and the tertiary spray room; the second water collecting tank is provided with a second water outlet, and the second water outlet is connected to the cooling water return pipe.

[0012] Furthermore, the spray room is also provided with a conveying assembly for conveying undemolded EPP molded parts, the conveying assembly comprising a transmission chain, a connecting rod and a driving wheel, the transmission chains are symmetrically arranged in two pieces, the two transmission chains are connected by a plurality of connecting rods to form a conveyor belt having a spatial grid structure, the driving wheel is installed on the spray room body, and the driving wheel can be driven to rotate to drive the conveyor belt to rotate; the conveyor belt passes through the first-level spray room, the second-level spray room and the third-level spray room in sequence from the outside of the spray room body, and then extends to the opposite outside of the spray room body, the spray rack comprises a plurality of spray pipes, and the plurality of spray pipes are arranged in a ring shape and surround the conveyor belt.

[0013] Furthermore, the spray rack also includes a connecting branch pipe for connecting multiple spray pipes, the multiple spray pipes include an upper spray pipe arranged above the conveyor belt, a lower spray pipe arranged below the conveyor belt, and a side spray pipe arranged outside the conveyor belt, and the upper spray pipe and the lower spray pipe are respectively connected to the side spray pipe through the connecting branch pipe.

[0014] Furthermore, any of the spray pipes is equipped with a plurality of spray heads along the rotation direction of the conveyor belt, and the spraying direction of any of the spray heads passes through the central axis of the top surface of the conveyor belt.

[0015] Furthermore, the drying room also includes a drying room body, and a shelf for placing demolded EPP molded parts is arranged in the drying room body. The heat exchanger is installed on the drying room body, and the heat exchanger has a heat exchanger air inlet and a heat exchanger air outlet. The air supply component includes a first air supply fan and a second air supply fan, and the first air supply fan and the second air supply fan are both arranged at the heat exchanger air inlet, and the first air supply fan is located below the second air supply fan. The heat exchanger air outlet is arranged at the top of the drying room body in a downward opening manner, and a secondary fan is installed at the heat exchanger air outlet.

[0016] Furthermore, the drying room is also provided with an induced draft fan, which is installed at the lower part of the drying room body. The induced draft fan has an induced draft fan air inlet, which is arranged in the drying room body in an upward opening manner and is located at the bottom of the drying room body. The induced draft fan air inlet is provided with an induced draft guide plate, which is an arc-shaped surface with the middle part concave toward the bottom surface of the drying room body.

[0017] Furthermore, the heat exchanger includes a heat exchange tube and a heat exchanger bracket. The heat exchange tube is installed on the drying room body through the heat exchanger bracket. The heat exchange tube is a flat tube. The heat exchange tube is bent continuously from bottom to top for multiple times to form a serpentine coil structure. The heat exchanger inlet is located at the lower part of the heat exchange tube, and the heat exchanger outlet is located at the upper part of the heat exchange tube.

[0018] Furthermore, the air outlet of the heat exchanger is provided with an upper air supply guide plate and a lower air supply guide plate, and the upper air supply guide plate is composed of a first guide surface and a second guide surface, the first guide surface is a plane inclined from front to rear, the front end of the first guide surface is inclined upward, and the rear end of the first guide surface is inclined downward and naturally transitioned to the second guide surface; the second guide surface is an arc surface with the middle part concave toward the top of the drying room body.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a combined production system for cooling and drying EPP molded parts, in which an air supply component and a heat exchanger are arranged in the drying room, and a first water collection pool is arranged to collect spray water and transport it to the heat exchanger as a hot medium to heat the cold air to achieve the purpose of hot air drying EPP molded parts; the spray room of the utility model is designed with a multi-stage spray structure, and the spray water of the first-stage spray is collected in a targeted manner for waste heat utilization, ensuring the drying effect; the drying room is equipped with a heat exchanger and an air supply component, which can use waste heat to heat the incoming air by itself, without the need for external hot air, effectively reducing the use cost. The system effectively utilizes the waste heat of cooling water, reduces production costs, and improves resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the system structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the spray room;

[0023] Figure 3 for Figure 2 Sectional view at AA;

[0024] Figure 4 It is a structural schematic diagram of the spray rack;

[0025] Figure 5 It is a schematic diagram of the structure of the transmission belt;

[0026] Figure 6 This is the main structural diagram of the drying room;

[0027] Figure 7 for Figure 6 Sectional view at the middle BB;

[0028] Figure 8 for Figure 7 Sectional view at CC. DETAILED DESCRIPTION

[0029] It should be noted that, in the description of this specification, the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The arrows in the figures all point to the medium flow direction of the corresponding medium. In the present embodiment, the various inlet and outlet structures are connected through pipelines, and valves and other structures can be correspondingly set on the pipeline to control the on-off of the pipeline. This is understandable to those skilled in the art and will not be elaborated here.

[0030] As shown in the figure, the utility model discloses a combined production system for cooling and drying EPP molded parts, including:

[0031] A spray room 1, wherein the spray room 1 is provided with a spray rack for spraying water to cool down the un-demolded EPP molded parts and a first water collection tank 15 for collecting the spray water;

[0032] A drying room 2, the drying room 2 comprising an air supply assembly for supplying air to the drying room 2 to dry the EPP molded parts after demoulding and a heat exchanger 32 for heating the cold air introduced by the air supply assembly into hot air;

[0033] The first water collecting tank 15 is provided with a first water outlet 18, and the heat exchanger 32 has a heat exchanger inlet 28. The first water outlet 18 is connected to the heat exchanger inlet 28. The spray water collected by the first water collecting tank 15 can be driven into the heat exchanger 32 and exchange heat with the cold air introduced by the air supply component. The air supply component and the heat exchanger 32 are provided in the drying room 2. At the same time, the first water collecting tank 15 is provided to collect the spray water and transport it to the heat exchanger 32 as a hot medium to heat the cold air to achieve the purpose of hot air drying the EPP molded parts. After the spray water sprays and cools the un-demolded EPP molded parts, it is transported to the heat exchanger 32 as a heat source to heat the cold air, effectively utilizing the waste heat of the spray water, reducing production costs and improving resource utilization.

[0034] In this embodiment, a cooling water pool 3 is also included, wherein the cooling water pool 3 has a cooling water return pipe and a cooling water outlet pipe, the spray rack is provided with a spray water inlet pipe 17, the heat exchanger 32 is provided with a heat exchanger outlet 29, the cooling water outlet pipe is connected to the spray water inlet pipe 17, and the heat exchanger outlet 29 is connected to the cooling water return pipe. Such a setting enables the spray water to form a complete cycle, ensuring that the spray water is not wasted. The spray water can be pressurized by setting a water pump during the circulation process to make its flow smoother; in the process of recycling, the spray water will inevitably produce consumption losses, so a water replenishment pipeline can be set in the cooling water pool 3 to ensure the total amount of spray water. A cooling heat exchanger 32 can also be set in the cooling water return pipe to further cool the return water of the spray water to improve the cooling effect during subsequent use.

[0035] In this embodiment, the spray room 1 also includes a spray room body 4 and a middle partition 5, at least two of the middle partitions 5 are provided, and the two middle partitions 5 are arranged in parallel in the spray room body 4 and divide the spray room body 4 into a primary spray room 11, a secondary spray room 12 and a tertiary spray room 13. The spray rack is installed in the spray room body 4 and passes through the primary spray room 11, the secondary spray room 12 and the tertiary spray room 13. The first collecting pool 15 is arranged at the bottom of the primary spray room 11 to collect the spray water of the primary spray room 11; the spray room body 4 is also provided with a second collecting pool 16, and the second collecting pool 16 is located at the bottom of the secondary spray room 12 and the tertiary spray room 13 to collect the spray water of the spray room and the tertiary spray room 13; the second collecting pool 16 is provided with a second water outlet 19, and the second water outlet 19 is connected to the cooling water return pipe. As shown in the figure, after the spray room 1 in this embodiment is separated by the middle partition 5, a three-stage spray cooling structure is formed. The step-by-step spray cooling can improve the cooling effect and shorten the cooling time. At the same time, the first-level spray room 11 is the first-level cooling spray structure. The spray water at this position has the highest temperature when it is recovered, and it is most suitable as a heat source to provide to the drying room 2. Therefore, a first water collection tank 15 is set here to provide hot working medium for the heat exchanger 32. The subsequent second and third-level spray rooms 13 are for further cooling to achieve the purpose of demoulding. The undemolded EPP molded parts have been cooled when entering the second and third-level spray rooms 13. Therefore, the temperature of the spray water recovered by the second and third-level spray rooms 13 is lower than that of the first-level spray room 11, so it is concentratedly recovered through the second water collection tank 16 and pumped back to the cooling water pool 3. The second water outlet 19 in this embodiment will merge with the outlet of the heat exchanger 29 and flow back to the cooling water pool 3 together. In the embodiment, the second water collecting pool 16 is composed of two parts, which are respectively arranged on the bottom surfaces of the secondary spray chamber 12 and the tertiary spray chamber 13 and are connected through the through hole 20 .

[0036] In this embodiment, the spray room 1 is also provided with a conveying assembly for conveying un-demolded EPP molded parts, and the conveying assembly includes a transmission chain 10, a connecting rod 23 and a driving wheel 9. The transmission chains 10 are symmetrically arranged in two pieces, and the two transmission chains are connected by a plurality of connecting rods 23 to form a conveyor belt with a spatial grid structure. The driving wheel 9 is installed on the spray room body 4, and the driving wheel 9 can be driven to rotate to drive the conveyor belt to rotate; the conveyor belt passes through the first-level spray room 11, the second-level spray room 12 and the third-level spray room 13 from the outside of the spray room body 4 in sequence, and then extends to the opposite outside of the spray room body 4. The opposite here refers to the starting position of the conveyor belt. If the transmission belt starts from the outside on the left, it ends at the outside on the right. The rest of the situations are the same and will not be repeated here. The spray rack includes a plurality of spray pipes, and the plurality of spray pipes are arranged in a ring and surround the conveyor belt. The driving wheel 9 in this embodiment is a toothed disc, and the transmission chain 10 is a chain that cooperates with the toothed disc. The transmission belt of this embodiment is designed as a spatial grid structure composed of the transmission chain 10 and the connecting rod 23 as shown in the figure, which can ensure the support of the un-demolded EPP molded parts while reducing the contact area and increasing the spraying area. The spray pipe is arranged in an annular shape as shown in the figure and surrounds the transmission belt, which can cover the conveyor belt in all directions to ensure that every part of the EPP molded parts can be cooled. As shown in the figure, there are four driving wheels in this embodiment, and each transmission chain is provided with two driving wheels. The driving wheels are driven by a motor or other driving device to drive the transmission chain to rotate, and then drive the transmission belt to drive the EPP molded parts. The driving wheels of this embodiment are rotatably mounted on the spray room body through a bracket or other supporting structure, and are correspondingly mounted on the two side end faces of the spray room body as shown in the figure, and are located outside the spray room body, so as to form effective support and drive for the two transmission chains respectively. The specific selection of the driving device, the number of driving wheels, the specific setting position and the setting method can be adjusted according to actual conditions, which can be understood by technicians in this technical field; how the driving device drives the corresponding driving wheels to rotate is a conventional technical means in this technical field and will not be elaborated here.

[0037] In this embodiment, the spray rack also includes a connecting branch pipe for connecting multiple spray pipes, and the multiple spray pipes include an upper spray pipe 6 arranged above the conveyor belt, a lower spray pipe 8 arranged below the conveyor belt, and a side spray pipe 7 arranged outside the conveyor belt. The upper spray pipe 6 and the lower spray pipe 8 are respectively connected to the side spray pipe 7 through connecting branches. As shown in the figure, two side spray pipes 7 are provided, which are respectively on both sides of the forward direction of the EPP molded part and located above the transmission belt. The connecting branch pipe is composed of a straight connecting branch pipe 21 and an "L"-shaped connecting branch pipe 22. The two straight connecting branch pipes 21 connect the upper spray pipe 6 and the two side spray pipes 7, and the "L"-shaped connecting branch pipe 22 connects the lower spray pipe 8 and the two side spray pipes 7 to form a surrounding of the transmission belt.

[0038] In this embodiment, any of the spray pipes is equipped with multiple nozzles 14 along the rotation direction of the conveyor belt, and the spray direction of any of the nozzles 14 passes through the central axis of the top surface of the conveyor belt. As shown in the figure, each spray pipe is equipped with multiple nozzles 14, and the spray water sprayed by the nozzles 14 is directed to the central axis of the top surface of the conveyor belt. Such an arrangement can cover the EPP molded parts to the maximum extent and ensure the cooling effect. The central axis here refers to the central axis of the top surface of the conveyor belt extending in the forward direction, that is, the centerline axis extending in the length direction.

[0039] In this embodiment, the drying room 2 also includes a drying room body 24, and a shelf 25 for placing EPP molded parts after demolding is arranged in the drying room body 24. The heat exchanger 32 is installed on the drying room body 24, and the heat exchanger 32 has a heat exchanger 32 air inlet and a heat exchanger 32 air outlet. The air supply component includes a first air supply fan 30 and a second air supply fan 31, and the first air supply fan 30 and the second air supply fan 31 are both arranged at the air inlet of the heat exchanger 32. The first air supply fan 30 is located below the second air supply fan 31, and the air outlet of the heat exchanger 32 is arranged at the top of the drying room body 24 in a downward opening manner, and the air outlet of the heat exchanger 32 is installed with a secondary fan 27. In this embodiment, the first blower 30, the second blower 31 and the secondary blower 27 are all industrial fans, and other air supply equipment such as blowers can also be used. The first blower 30 and the second blower 31 are used to blow cold air into the heat exchanger 32 for heat exchange to obtain hot air and send it to the air outlet of the heat exchanger 32. The secondary blower 27 introduces hot air into the drying room body 24 to dry the demoulded EPP molded parts. The output power of the first blower 30 is greater than the output power of the second blower 31. Because the inlet of the heat exchanger 32 is set at the bottom, the temperature at the bottom is higher than that at the top. The output power of the first blower 30 located at the bottom is set larger to ensure that more wind enters from the bottom and exchanges heat to ensure that the hot air obtained meets the drying requirements. The storage rack 25 adopts a grid structure with good air permeability and small contact area, and can also ensure stable and reliable support.

[0040] In this embodiment, the drying room 2 is further provided with an induced draft fan 38, which is installed at the lower part of the drying room body 24. The induced draft fan 38 has an induced draft fan 38 air inlet 26, which is arranged in the drying room body 24 in an upwardly opening manner and is located at the bottom of the drying room body 24. The induced draft fan 38 air inlet 26 is provided with an induced draft guide plate 37, and the induced draft guide plate 37 is an arc-shaped curved surface with the middle part concave toward the bottom surface of the drying room body 24. The induced draft fan 38 is an industrial fan, and other blowing equipment such as a blower can also be used. The output power of the induced draft fan 38 is set to be not less than the sum of the powers of the first blower 30 and the second blower 31, so as to ensure that the hot air entering the drying room 2 version body can be completely discharged by the induced draft fan 38. The output power of the induced draft fan 38 is set to be slightly greater than the sum of the powers of the first blower 30 and the second blower 31, which is preferably to keep the drying room body 24 in a state of slight negative pressure during operation. The induced air guide plate 37 is designed as an arc surface, which can smoothly guide the hot air blown down vertically to a horizontal direction and be sucked out by the induced air fan 38, so that the gas flow in the drying room 2 is smoother.

[0041] In this embodiment, the heat exchanger 32 includes a heat exchange tube 33 and a heat exchanger bracket 34. The heat exchange tube is installed on the drying room body through the heat exchanger bracket. The heat exchange tube 33 is a flat tube. The heat exchange tube 33 is bent from bottom to top for multiple times to form a serpentine coil structure. The heat exchanger inlet 28 is located at the lower part of the heat exchange tube 33, and the heat exchanger outlet 29 is located at the upper part of the heat exchange tube 33. The flat tube has a better heat exchange effect, and it is bent from bottom to top for multiple times to form a serpentine coil structure, which further improves the heat exchange effect. The heat exchanger inlet 28 is set at the lower part, and the heat exchanger outlet 29 is set at the upper part, which can ensure that the spray water flows and exchanges heat fully in the heat exchange tube 33.

[0042] In this embodiment, the air outlet of the heat exchanger 32 is provided with an upper air supply guide plate 35 and a lower air supply guide plate 36. The upper air supply guide plate 35 is composed of a first guide surface and a second guide surface. The first guide surface is a plane inclined from front to back, the front end of the first guide surface is inclined upward, and the rear end of the first guide surface is inclined downward and naturally transitioned to the second guide surface; the second guide surface is an arc surface with a middle part concave toward the top of the drying room body 24. The lower air supply guide plate 36 is used to guide the hot air from the lower part of the heat exchanger 32 to the upper part, and the upper air supply guide plate 35 is used to change the flow direction of the hot air and guide the hot air to the secondary fan 27. Through the inclined first guide surface and the arc-shaped second guide surface, the hot air can be naturally and smoothly guided to flow vertically downward, thereby ensuring that the gas flow in the drying room 2 is smoother and more reasonable.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A combined production system for cooling and drying EPP molded parts, characterized by: include: A spray room, wherein the spray room is provided with a spray rack for spraying water to cool down the undemolded EPP molded parts and a first water collection tank for collecting the spray water; A drying room, the drying room comprising an air supply assembly for supplying air to the drying room to dry the demoulded EPP molded parts and a heat exchanger for heating the cold air introduced by the air supply assembly into hot air; The first water collecting tank is provided with a first water outlet, the heat exchanger has a heat exchanger inlet, and the first water outlet is communicated with the heat exchanger inlet.

2. The EPP molded parts cooling and drying combined production system according to claim 1 is characterized by: It also includes a cooling water pool, which has a cooling water return pipe and a cooling water outlet pipe. The spray rack is provided with a spray water inlet pipe. The heat exchanger is provided with a heat exchanger outlet. The cooling water outlet pipe is connected to the spray water inlet pipe, and the heat exchanger outlet is connected to the cooling water return pipe.

3. The EPP molded parts cooling and drying combined production system according to claim 2 is characterized by: The spray room also includes a spray room body and a middle partition, at least two of the middle partitions are provided, the two middle partitions are arranged in parallel in the spray room body and divide the spray room body into a primary spray room, a secondary spray room and a tertiary spray room, the spray rack is installed in the spray room body and passes through the primary spray room, the secondary spray room and the tertiary spray room, the first water collecting tank is arranged at the bottom of the primary spray room for collecting the spray water of the primary spray room; the spray room body is also provided with a second water collecting tank, the second water collecting tank is located at the bottom of the secondary spray room and the tertiary spray room for collecting the spray water of the spray room and the tertiary spray room; the second water collecting tank is provided with a second water outlet, and the second water outlet is connected to the cooling water return pipe.

4. The EPP molded parts cooling and drying combined production system according to claim 3 is characterized by: The spray room is also provided with a conveying assembly for conveying undemolded EPP molded parts, and the conveying assembly includes a transmission chain, a connecting rod and a driving wheel. The transmission chains are symmetrically arranged in two pieces, and the two transmission chains are connected by a plurality of connecting rods to form a conveyor belt with a spatial grid structure. The driving wheel is installed on the spray room body, and the driving wheel can be driven to rotate to drive the conveyor belt to rotate; the conveyor belt passes through the first-level spray room, the second-level spray room and the third-level spray room in sequence from the outside of the spray room body, and then extends to the opposite outside of the spray room body. The spray rack includes a plurality of spray pipes, and the plurality of spray pipes are arranged in a ring shape and surround the conveyor belt.

5. The EPP molded parts cooling and drying combined production system according to claim 4 is characterized by: The spray rack also includes a connecting branch pipe for connecting multiple spray pipes, and the multiple spray pipes include an upper spray pipe arranged above the conveyor belt, a lower spray pipe arranged below the conveyor belt, and a side spray pipe arranged outside the conveyor belt. The upper spray pipe and the lower spray pipe are respectively connected to the side spray pipe through the connecting branch pipe.

6. The EPP molded parts cooling and drying combined production system according to claim 5 is characterized by: Any of the spray pipes is equipped with a plurality of spray heads along the rotation direction of the conveyor belt, and the spraying direction of any of the spray heads passes through the central axis of the top surface of the conveyor belt.

7. The EPP molded parts cooling and drying combined production system according to claim 1 is characterized by: The drying room also includes a drying room body, in which a shelf for placing demolded EPP molded parts is arranged, the heat exchanger is installed on the drying room body, the heat exchanger has a heat exchanger air inlet and a heat exchanger air outlet, the air supply component includes a first air supply fan and a second air supply fan, the first air supply fan and the second air supply fan are both arranged at the heat exchanger air inlet, the first air supply fan is located below the second air supply fan, the heat exchanger air outlet is arranged at the top of the drying room body in a downward opening manner, and the heat exchanger air outlet is installed with a secondary fan.

8. The EPP molded parts cooling and drying combined production system according to claim 7 is characterized by: The drying room is also provided with an induced draft fan, which is installed at the lower part of the drying room body. The induced draft fan has an induced draft fan air inlet, which is arranged in the drying room body in an upward opening manner and is located at the bottom of the drying room body. The induced draft fan air inlet is provided with an induced draft guide plate, which is an arc-shaped surface with the middle part concave toward the bottom surface of the drying room body.

9. The EPP molded part cooling and drying combined production system according to claim 8, characterized in that: The heat exchanger includes a heat exchange tube and a heat exchanger bracket. The heat exchange tube is installed on the drying room body through the heat exchanger bracket. The heat exchange tube is a flat tube. The heat exchange tube is bent continuously from bottom to top for multiple times to form a serpentine coil structure. The heat exchanger inlet is located at the lower part of the heat exchange tube, and the heat exchanger outlet is located at the upper part of the heat exchange tube.

10. The EPP molded parts cooling and drying combined production system according to claim 9, characterized in that: The air outlet of the heat exchanger is provided with an upper air supply guide plate and a lower air supply guide plate, and the upper air supply guide plate is composed of a first guide surface and a second guide surface, the first guide surface is a plane inclined from front to rear, the front end of the first guide surface is inclined upward, and the rear end of the first guide surface is inclined downward and naturally transitioned to the second guide surface; the second guide surface is an arc surface with the middle part concave toward the top of the drying room body.

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