Multi-stage spraying room for cooling EPP (Expanded Polypropylene) forming part

Abstract

The utility model discloses a multistage spray room for cooling EPP (Expanded Polypropylene) forming parts, which comprises a spray room body and a middle partition plate, and the spray room body is provided with a spray frame for spraying water to cool the EPP forming parts which are not demoulded; the number of the middle partition plates is at least two, the two middle partition plates are arranged in the spraying room body in parallel and divide the spraying room body into a first-stage spraying chamber, a second-stage spraying chamber and a third-stage spraying chamber, the first-stage spraying chamber is provided with a first water collecting pool used for collecting spraying water in the first-stage spraying chamber, and the second-stage spraying chamber is provided with a second water collecting pool used for collecting spraying water in the second-stage spraying chamber. The first water collecting tank is provided with a first water outlet for conveying spray water in the first water collecting tank to a set position; according to the multi-stage spraying structure, the cooling effect is ensured, meanwhile, the first water collecting pool is arranged to collect spraying water and convey the spraying water to a set position to serve as a hot working medium for heat exchange, waste heat of cooling water is effectively utilized, the production cost is reduced, and the resource utilization rate is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of EPP material molding, and relates to a multi-stage spray room for cooling 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 buffer insulation 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. Therefore, it is widely used in daily necessities, packaging, industry, agriculture, transportation, military industry, and aerospace industry. EPP raw materials need to be initially formed by high-temperature foaming in the mold, and then the entire mold is cooled and demolded to obtain EPP molded parts. 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 spray room is needed, which can collect the spray water as a heat source for other equipment while ensuring the cooling effect, so as to reduce production costs and improve resource utilization. Utility Model Content

[0005] In view of this, the present invention provides a multi-stage spray room for cooling EPP molded parts. The structure of the multi-stage spray room ensures the cooling effect. At the same time, a first water collection pool is set to collect spray water and transport it to a set position to be used as a thermal medium for heat exchange, which effectively utilizes the waste heat of cooling water, reduces production costs, and improves resource utilization.

[0006] The utility model discloses a multi-stage spray room for cooling EPP molded parts, comprising a spray room body and a middle partition, wherein the spray room body is equipped with a spray rack for spraying water to cool down the EPP molded parts that have not been demolded; at least two middle partitions are provided, and 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, wherein the primary spray room is provided with a first water collection tank for collecting the spray water in the primary spray room, and the first water collection tank is provided with a first water outlet for conveying the spray water in the first water collection tank to a set position.

[0007] Furthermore, the spray rack is installed in the spray room body and passes through the first-level spray room, the second-level spray room and the third-level spray room in sequence; the spray room body is also provided with a second water collecting tank, which is located at the bottom of the second-level spray room and the third-level spray room for collecting spray water from the spray room and the third-level spray room; the second water collecting tank is provided with a second water outlet.

[0008] 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, the two conveying 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.

[0009] Furthermore, 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.

[0010] 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.

[0011] 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.

[0012] Beneficial effects of the utility model:

[0013] The utility model provides a multi-stage spray room for cooling 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, thereby ensuring the drying effect; the waste heat of the cooling water is effectively utilized, the production cost is reduced, and the resource utilization rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the practical application of the utility model in the embodiment;

[0015] Figure 2 This is a schematic diagram of the structure of the spray room;

[0016] Figure 3 for Figure 2 Sectional view at AA;

[0017] Figure 4 It is a structural schematic diagram of the spray rack;

[0018] Figure 5 Schematic diagram of the transmission belt structure. DETAILED DESCRIPTION

[0019] 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.

[0020] The present invention will be further described below in combination with actual production, taking the combined production of cooling, demoulding and drying of EPP molded parts as the background.

[0021] As shown in the figure, this embodiment includes:

[0022] 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;

[0023] A drying room 2, wherein the drying room 2 comprises an air supply component for supplying air to the drying room 2 to dry the EPP molded parts after demoulding, and a heat exchanger for heating the cold air introduced by the air supply component into hot air;

[0024] The first water collecting tank 15 is provided with a first water outlet 18, and the heat exchanger has a heat exchanger inlet. The first water outlet 18 is connected to the heat exchanger inlet, and the spray water collected by the first water collecting tank 15 can be driven into the heat exchanger and heat exchanged with the cold air introduced by the air supply component. An air supply component and a heat exchanger are provided in the drying room 2, and a first water collecting tank 15 is provided to collect the 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 the EPP molded parts. After the spray water sprays and cools the undemolded EPP molded parts, it is transported to the heat exchanger 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.

[0025] In this embodiment, a cooling water pool 3 is also included. 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 is provided with a heat exchanger outlet. The cooling water outlet pipe is connected to the spray water inlet pipe 17, and the heat exchanger outlet is connected to the cooling water return pipe. Such a setting allows 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.

[0026] 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 .

[0027] 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 conveying 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, 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.

[0028] 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.

[0029] 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.

[0030] 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 multi-stage spray room for cooling EPP molded parts, characterized by: It includes a spray room body and a middle partition, wherein the spray room body is equipped with a spray rack for spraying water to cool down the undemolded EPP molded parts; at least 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 primary spray room is provided with a first water collection tank for collecting the spray water in the primary spray room, and the first water collection tank is provided with a first water outlet for conveying the spray water in the first water collection tank to a set position.

2. The multi-stage spray room for cooling EPP molded parts according to claim 1 is characterized in that: The spray rack is installed in the spray room body and passes through the first-level spray room, the second-level spray room and the third-level spray room in sequence; the spray room body is also provided with a second water collecting pool, which is located at the bottom of the second-level spray room and the third-level spray room and is used to collect the spray water of the spray room and the third-level spray room; the second water collecting pool is provided with a second water outlet.

3. The multi-stage spray room for cooling EPP molded parts according to claim 2 is characterized in that: 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.

4. The multi-stage spray room for cooling EPP molded parts according to claim 3 is characterized in that: The spray rack comprises a plurality of spray pipes, which are arranged in a ring shape and surround the conveyor belt.

5. The multi-stage spray room for cooling EPP molded parts according to claim 4 is characterized in that: 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 multi-stage spray room for cooling EPP molded parts according to claim 5 is characterized in that: 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.

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