Raw material drying device for polyethylene composite pipe production
By designing a polyethylene composite pipe raw material drying device including a drying box, material conveying mechanism, bulk frame, material limit scraper and heating component, the problems of uneven drying and inefficiency of traditional drying devices are solved, and a more uniform and efficient drying effect is achieved.
Patent Information
- Application Number
- CN202421964230.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-14
AI Technical Summary
The core tube raw material drying device of traditional polyethylene composite pipes results in uneven drying, which consumes a long processing time and is inefficient.
A raw material drying device including a drying box, a feeding mechanism, a bulk frame, a material limiting scraper and a heating assembly are designed. By setting forward belt conveyors, reverse belt conveyors, belt discharge parts and spacer plates, the core tube raw materials are folded and conveyed multiple times in the drying box, increasing the drying time; using bulk material frames and material limiting scrapers, the contact area and contact time of the core tube raw materials and hot gas are increased, and more uniform drying is achieved.
Through multiple rolling and conveying and dispersing of the material, the contact time and area between the core tube raw materials and hot gas is increased, and a more uniform drying effect is achieved, solving the problem of inefficiency of traditional drying devices.
Smart Images
Figure CN223013633U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of polyethylene composite pipe production, and specifically discloses a raw material drying device for polyethylene composite pipe production. Background Art
[0002] Polyethylene composite pipes refer to pipes made of two different density polyethylene resins. The two resins are respectively plasticized and melted by two extruders at the same time, and then the molten materials are simultaneously extruded into a mold capable of forming a composite pipe. The formed pipe is a polyethylene composite pipe. This kind of pipe formed by compounding high-density polyethylene and low-density polyethylene materials has the characteristics of both raw materials, and its pressure resistance and corrosion resistance are better than those of ordinary polyethylene pipes. During the production and processing of polyethylene composite pipes, in order to ensure the forming effect of the core pipe, the raw materials of the core pipe need to be dried before the preparation and processing of the core pipe. The main raw material of the core pipe of polyethylene composite pipes is polyethylene, which is a substance in the form of milky white waxy particles or powder.
[0003] The existing drying treatment of the core pipe raw materials is usually completed by a drying device. However, when the traditional raw material drying device for polyethylene composite pipes dries a batch of core pipe raw materials, the batch of core pipe raw materials need to be completely dried from the outside to the inside, with uneven drying, long drying processing time, and low efficiency. Therefore, in view of this, the inventor provides a raw material drying device for polyethylene composite pipe production to solve the above problems. Summary of the Utility Model
[0004] The purpose of the present utility model is to solve the problems of uneven drying, long processing time, and low efficiency when the core pipe raw materials of traditional polyethylene composite pipes are processed by a drying device.
[0005] To achieve the above object, the basic solution of the present utility model provides a raw material drying device for the production of polyethylene composite pipes, including a drying box. One end of the top of the drying box is provided with a feeding port, and the bottom of the drying box is provided with a discharging port. A feeding mechanism for conveying the core pipe raw material is further arranged between the feeding port and the discharging port. The feeding mechanism includes a plurality of forward belt feeding members arranged vertically in the drying box and used for conveying the core pipe raw material from one end of the drying box close to the feeding port to the direction away from the feeding port of the drying box, a plurality of reverse belt feeding members arranged between adjacent two groups of forward belt feeding members, and a belt discharging member for conveying the core pipe raw material conveyed by the forward belt feeding member at the lowest end to the discharging port. A material discharging port for downward conveying of the core pipe raw material is arranged between the feeding ends of the forward belt feeding members and the reverse belt feeding members and the inner side wall of the drying box. A plurality of partition plates are arranged on both inner side walls of the drying box and are respectively located below each group of forward belt feeding members and reverse belt feeding members. A material scattering frame for dispersing the core pipe raw material for discharging is arranged between the end of the partition plate and the other inner side wall of the drying box. On one side of the bottom of the feeding port close to the material discharging port of the forward belt feeding member and on one side of the partition plate close to the material discharging port, a material limiting scraping plate for limiting the conveying thickness of the core pipe raw material on the conveying component is arranged. A drying component for drying the core pipe raw material is arranged in the drying box, and a heat supply component for supplying hot air into the drying box is further arranged on the side of the drying box.
[0006] The principle and effect of this basic solution are as follows:
[0007] 1. Compared with the prior art, the present utility model increases the conveying time of the core pipe raw material inside the drying box by arranging forward belt feeding members, reverse belt feeding members, belt discharging members and partition plates, so that the core pipe raw material is conveyed in multiple layers and multiple times of folding from the feeding port to the discharging port. And by arranging a drying component and a heat supply component, the drying time of heat exchange contact between the core pipe raw material and the hot air during the conveying process inside the drying box is further increased.
[0008] 2. Compared with the prior art, the present utility model facilitates the dispersed discharging of the core pipe raw material by arranging a material scattering frame, thereby increasing the gap between the monomers of the core pipe raw material during the discharging process, and further increasing the contact area between the monomers of the core pipe raw material and the hot air, making the hot drying effect better. By arranging a material limiting scraping plate, the laying thickness of the core pipe raw material conveyed on the forward belt feeding members, reverse belt feeding members and belt discharging members of the feeding mechanism is leveled and limited, so as to avoid the influence of the too large laying thickness of the core pipe raw material on the heat exchange drying of the core pipe raw material at the bottom layer with the hot air, thus making the drying of the core pipe raw material more uniform, and solving the problems of uneven drying, long processing time and low efficiency when the core pipe raw material of traditional polyethylene composite pipes is processed by a drying device.
[0009] Further, the forward belt feeding member includes a first driving belt roller whose two ends are respectively rotatably connected to both sides of one end of the inner wall of the drying box near the feeding port, a first driven belt roller whose two ends are respectively rotatably connected to both sides of one end of the inner wall of the drying box far from the feeding port, and a first belt meshingly connected between the first driving belt roller and the first driven belt roller. The reverse belt feeding member includes a second driving belt roller whose two ends are respectively rotatably connected to both inner walls of the drying box and are located below the discharging port, a second driven belt roller respectively rotatably connected to both inner walls of the drying box and located below the feeding port, and a second belt meshingly connected between the second driving belt roller and the second driven belt roller. The belt discharging member includes a third driving belt roller whose two ends are respectively rotatably connected to both inner walls of the drying box and are directly below the discharging port of the forward belt feeding member near the discharging port, a third driven belt roller rotatably connected between both inner walls of the drying box and located directly above the discharging port, and a third belt meshingly connected between the third driving belt roller and the third driven belt roller. The discharging ports are respectively arranged between the first driven belt roller and one inner wall of the drying box and between the second driven belt roller and the other inner wall of the drying box. A transmission assembly for driving the forward belt feeding member, the reverse belt feeding member, and the belt discharging member to move is further provided on the side of the drying box. By arranging the forward belt feeding member and the reverse belt feeding member in an interspersed manner, it is convenient for the multiple transfer and transportation of the core pipe raw materials, thereby increasing the drying treatment time of the core pipe raw materials. By arranging the third driven belt roller directly above the discharging port, it is convenient to discharge the core pipe raw materials after drying treatment from the drying box. The structure is simple and the transportation is convenient.
[0010] Further, the transmission assembly includes a motor detachably and rotatably connected and installed on the outside of the drying box and coaxially connected to one end of the first driving belt roller, a forward chain transmission mechanism installed between two adjacent first driven belt rollers, a gear transmission mechanism installed between any adjacent second driving belt roller and any first driven belt roller, and a synchronous chain transmission mechanism arranged between the third driving belt roller and any second driving belt roller. By driving the first driving belt roller to rotate by the motor, and by arranging the forward chain transmission mechanism, the gear transmission mechanism, and the synchronous chain transmission mechanism, the first driving belt roller directly or indirectly drives the meshing operation of the first belt, the second belt, and the third belt respectively, thereby realizing the continuity of transporting the core pipe raw materials in the drying box.
[0011] Furthermore, the heating assembly includes an air inlet pipe arranged on the side of one end of the top of the drying box near the feed port, an air outlet pipe arranged on the side of one end of the bottom of the drying box away from the third belt, a heating fan installed at the end of the air inlet pipe away from the drying box and used to pass hot air into the air inlet pipe, and a controller for controlling the operation of the heating fan. By setting the air inlet pipe, the air outlet pipe and the heating fan, and combining the feed port and the material partition plate, it is convenient for the hot air supplied by the heating fan to enter the drying box from the air inlet pipe, and to be transported in the drying box in a winding manner along the feeding direction, thereby increasing the contact area and contact time between the hot air inside the drying box and the core tube raw material, which is convenient for heat exchange and drying.
[0012] Furthermore, the distance between the bottom end of the limiting scraper in the drying box and the feeding mechanism decreases from top to bottom. By setting the distance between the limiting scraper and the feeding mechanism to decrease layer by layer, the feeding thickness of each layer is reduced layer by layer, and the core tube raw materials on the first belt, the second belt and the third belt are thinned successively according to the successive reduction of the installation height in the drying box, so that the core tube raw materials can be more fully and comprehensively dried by hot air.
[0013] Furthermore, the bulk material frame includes a bulk material plate connected between the end surface of the material partition plate and the inner side wall of the drying box, and a plurality of bulk material chutes arranged in the bulk material plate and capable of accommodating the core tube raw materials to pass through, and a material dividing prism block is arranged between two adjacent bulk material chutes. By arranging the bulk material plate and the bulk material chutes, it is convenient to disperse the core tube raw materials passing through the material discharge port, and it is prevented that the core tube raw materials fall into the feeding mechanism in piles and affect the drying effect of the core tube raw materials. By arranging the material dividing prism block, it is not only convenient to guide the core tube raw materials passing through the bulk material frame, but also the use of the prism structure can prevent the core tube raw materials from being blocked on the upper surface of the bulk material frame and unable to be discharged.
[0014] Furthermore, the drying assembly includes a first electric heating plate arranged at the inner top of the drying box and above the feeding assembly, a second electric heating plate arranged at the bottom of the material partition plate located above the third belt, and a third electric heating plate arranged at the bottom of the material partition plate located above the first belt and the second belt, and the first electric heating plate, the second electric heating plate and the third electric heating plate are all electrically connected to the controller. By arranging the first electric heating plate, the second electric heating plate and the third electric heating plate, it is convenient to dry the core tube raw materials transported on each feeding mechanism, realize the whole process drying process, greatly improve the drying efficiency, and make the drying process of the core tube raw materials more sufficient and thorough. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.
[0016] Figure 1 Fig. 4 shows the main structural view of a raw material drying device for the production of polyethylene composite pipes proposed in an embodiment of the present application;
[0017] Figure 2 Fig. 8 shows the structural sectional view of the bulk material box of a raw material drying device for the production of polyethylene composite pipes proposed in an embodiment of the present application;
[0018] Figure 3 Fig. 12 shows the main structural view of the transmission assembly of a raw material drying device for the production of polyethylene composite pipes proposed in an embodiment of the present application. Detailed Embodiment
[0019] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended utility model purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features, and their effects of the present invention as follows.
[0020] The reference numerals in the accompanying drawings of the specification include: drying box 1, feed inlet 2, discharge outlet 3, blanking port 4, partition plate 5, bulk material box 6, limiting scraping plate 7, first driving belt roller 8, first driven belt roller 9, first belt 10, second driving belt roller 11, second driven belt roller 12, second belt 13, third driving belt roller 14, third driven belt roller 15, third belt 16, motor 17, positive chain transmission mechanism 18, gear transmission mechanism 19, synchronous chain transmission mechanism 20, air inlet pipe 21, air outlet pipe 22, bulk material plate 23, bulk material chute 24, material distribution prism block 25, first electric heating plate 26, second electric heating plate 27, third electric heating plate 28.
[0021] A raw material drying device for the production of polyethylene composite pipes, as shown in the embodiment Figure 1As shown in the figure, it includes a drying box 1. At the left end of the top of the drying box 1, there is a feeding port 2. At the bottom of the drying box 1, there is a discharging port 3. Between the feeding port 2 and the discharging port 3, there is also a feeding mechanism for conveying the core pipe raw materials. The feeding mechanism includes two groups of forward belt feeding parts arranged vertically in the drying box 1 and used for conveying the core pipe raw materials from the left end to the right end of the drying box 1, a group of reverse belt feeding parts arranged between two adjacent groups of forward belt feeding parts, and a belt discharging part used for conveying the core pipe raw materials conveyed by the second group of forward belt feeding parts to the discharging port 3. At the feeding ends of the forward belt feeding parts and the reverse belt feeding parts, there are feeding ports 4 for making the core pipe raw materials convey downward between the inner side walls of the drying box 1. On both inner walls of the drying box 1, there are a total of three baffle plates 5 respectively located below each group of forward belt feeding parts and reverse belt feeding parts. Between the end of the baffle plate 5 and the inner wall of the other side of the drying box 1 away from the baffle plate 5, there is a material scattering frame 6 for dispersing and discharging the core pipe raw materials. On the right side of the bottom of the feeding port 2 and on the side of the baffle plate 5 close to the feeding port 4, there are limiting scraping plates 7 for limiting the feeding thickness of the core pipe raw materials on the feeding components. Inside the drying box 1, there is a drying component for drying the core pipe raw materials. On the side of the drying box 1, there is also a heat supply component for supplying hot air into the drying box 1.
[0022] Among them, as Figure 1 shown, the forward belt feeding part includes a first driving belt roller 8 whose two ends are respectively rotationally connected to both sides of the left end of the inner wall of the drying box 1, a first driven belt roller 9 whose two ends are respectively rotationally connected to both sides of the right end of the inner wall of the drying box 1, and a first belt 10 meshed and connected between the first driving belt roller 8 and the first driven belt roller 9. The reverse belt feeding part includes a second driving belt roller 11 whose two ends are respectively rotationally connected to both sides of the right end inner wall of the drying box 1 and located below the feeding port 4, a second driven belt roller 12 respectively rotationally connected to both sides of the left end inner wall of the drying box 1 and located below the feeding port 2, and a second belt 13 meshed and connected between the second driving belt roller 11 and the second driven belt roller 12. The belt discharging part includes a third driving belt roller 14 whose two ends are respectively rotationally connected to both sides of the right end inner wall of the drying box 1 and located directly below the feeding port 4 of the forward belt feeding part close to the feeding port 4, a third driven belt roller 15 rotationally connected between the middle two sides of the inner wall of the drying box 1 and located directly above the discharging port 3, and a third belt 16 meshed and connected between the third driving belt roller 14 and the third driven belt roller 15. The feeding ports 4 are respectively arranged between the first driven belt roller 9 and the right end inner wall of the drying box 1 and between the second driven belt roller 12 and the left end inner wall of the drying box 1. On the side of the drying box 1, there is also a transmission component for driving the forward belt feeding part, the reverse belt feeding part, and the belt discharging part to move.
[0023] Among them, as Figure 3As shown in the figure, the transmission assembly includes a motor 17 detachably and rotatably connected and installed on the front side of the drying box 1 and coaxially connected to the front end of the first driving belt roller 8, a positive chain transmission mechanism 18 installed between the upper and lower first driven belt rollers 9, a gear transmission mechanism 19 installed between any adjacent second driving belt roller 11 and any first driven belt roller 9, and a synchronous chain transmission mechanism 20 provided between the third driving belt roller 14 and any second driving belt roller 11.
[0024] Among them, as Figure 1 shown, the heating assembly includes an air inlet pipe 21 provided on the left side of the top end of the drying box 1, an air outlet pipe 22 provided on the left side of the bottom end of the drying box 1, a heating fan installed at one end of the air inlet pipe 21 away from the drying box 1 for introducing hot air into the air inlet pipe 21, and a controller for controlling the operation of the heating fan. The controller includes but is not limited to a PLC controller.
[0025] Among them, as Figure 1 shown, the distance between the bottom end of the material limiting scraper 7 in the drying box 1 and the feeding mechanism decreases one by one from top to bottom.
[0026] Among them, as Figure 2 shown, the material scattering frame 6 includes a material scattering plate 23 connected between the end face of the partition plate 5 and the inner side wall of the drying box 1, and dozens of material scattering inclined grooves 24 provided in the material scattering plate 23 and allowing the core pipe raw material to pass through. A material distributing prism block 25 is provided between any two adjacent material scattering inclined grooves 24.
[0027] Among them, as Figure 1 shown, the drying assembly includes a first electric heating plate 26 provided on the inner top of the drying box 1 and above the feeding assembly, a second electric heating plate 27 provided on the bottom surface of the partition plate 5 above the third belt 16, and a third electric heating plate 28 provided on the bottom surface of the partition plate 5 above the first belt 10 and the second belt 13. The first electric heating plate 26, the second electric heating plate 27, and the third electric heating plate 28 are all electrically connected to the controller.
[0028] In the specific implementation process of the present utility model, before adding the core pipe raw materials into the drying box 1 for drying treatment, the startup preparation work is carried out first. The first electric heating plate 26, the second electric heating plate 27 and the third electric heating plate 28 are controlled by the controller to be energized for preheating. The heat supply blower is energized by the controller and hot air is continuously introduced into the air inlet pipe 21. At the same time, the motor 17 is energized. The first driving belt roller 8 of the first group of positive belt feeding components located above the drying box 1 is driven by the motor 17 to rotate, so as to engage with the first belt 10 and drive the first driven belt roller 9 to rotate. Then, the first driven belt roller 9 drives the first driven belt roller 9 of the second group of positive belt feeding components located below through the positive chain transmission mechanism 18. At the same time, the first driven belt roller 9 drives the second driving belt roller 11 of the reverse belt feeding component to rotate through the gear transmission mechanism 19, so as to engage with the second belt 13 and drive the second driven belt roller 12 to rotate. Then, the second driving belt roller 11 drives the third driving belt roller 14 of the discharge feeding component to rotate through the synchronous chain transmission mechanism 20, so as to engage with the third belt 16 and drive the third driven belt roller 15 to rotate, making the overall mechanical structure operate to complete the startup preparation work.
[0029] When adding the core pipe raw materials into the drying box 1, the core pipe raw materials are put in from the feeding port 2. After the core pipe raw materials enter the drying box 1, they fall on the first belt 10 closest to the feeding port 2, and are evenly scraped flat by the material limiting scraper 7 above the first belt 10 as the first belt 10 rotates and runs towards the right end of the first belt 10. Then, the core pipe raw materials flow through the material scattering frame 6 installed at the lower material outlet 4 from the right end of the first belt 10 and fall on the second belt 13 below the lower material outlet 4. The core pipe raw materials are scraped flat and thinned in thickness by another material limiting scraper 7, and the core pipe raw materials are transported to the left along with the running direction of the second belt 13. Then, they flow through the material scattering frame 6 located at the left end of the second belt 13 and fall on the first belt 10 at the lower end of the drying box 1. The core pipe raw materials are scraped flat and thinned in thickness by another material limiting scraper 7 and are transported to the right along with the first belt 10, and flow through the material scattering frame 6 and the lower material outlet 4 located at the right end of the first belt 10, so that the core pipe raw materials fall on the third belt 16, and are transported to the left along with the third belt 16, and finally fall into the discharge port 3 and are collected and packed by the production workers. During this process, the core pipe raw materials are successively heat-treated by the first electric heating plate 26, the second electric heating plate 27 and the third electric heating plate 28, and are further dehydrated through heat exchange with the hot air flow, completing the drying treatment of the core pipe raw materials.
[0030] Compared with the prior art, the utility model facilitates the dispersed feeding of the core pipe raw materials by arranging the bulk material box 6, thereby increasing the gap between the monomers of the core pipe raw materials during the feeding process, further increasing the contact area between the monomers of the core pipe raw materials and the hot air, and making the hot drying effect better. By arranging the material limiting scraper 7, the laying thickness of the core pipe raw materials conveyed on the forward belt feeding part, the reverse belt feeding part and the belt discharging part of the feeding mechanism is leveled and limited, so as to avoid the influence on the heat exchange and drying of the core pipe raw materials at the bottom layer due to the too large laying thickness of the core pipe raw materials, thereby making the drying of the core pipe raw materials more uniform, and solving the problems of uneven drying, long processing time and low efficiency when the core pipe raw materials of the traditional polyethylene composite pipe are processed by a drying device.
[0031] The above is only a preferred embodiment of the utility model, and does not impose any form of limitation on the utility model. Although the utility model has been disclosed above with the preferred embodiment, it is not intended to limit the utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content without departing from the technical solution scope of the utility model. However, as long as it does not depart from the technical solution content of the utility model, any brief modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model still fall within the scope of the technical solution of the utility model.
Claims
1. A raw material drying device for the production of polyethylene composite pipes, characterized in that: The invention comprises a drying box, wherein a feed port is arranged at one end of the top of the drying box, a discharge port is arranged at the bottom of the drying box, and a feeding mechanism for conveying core tube raw materials is also arranged between the feed port and the discharge port, the feeding mechanism comprises a plurality of forward belt feeding members arranged vertically in the drying box and used for conveying the core tube raw materials from one end of the drying box close to the feed port to the direction of the end of the drying box far from the feed port, a plurality of reverse belt feeding members arranged between two adjacent groups of forward belt feeding members, and a belt discharge member used for conveying the core tube raw materials conveyed by the forward belt feeding member at the lowest end to the discharge port, and the feeding ends of the forward belt feeding member and the reverse belt feeding member are both connected to the drying box. A feeding port for conveying the core tube raw material downward is provided between the inner side walls of the box, and a plurality of partition plates are provided on the inner walls on both sides of the drying box, which are respectively located below each group of forward belt conveyors and reverse belt conveyors. A bulk material frame for dispersing the core tube raw material is provided between the end of the partition plate and the inner wall on the other side of the drying box, and a limiting scraper for limiting the feeding thickness of the core tube raw material on the feeding assembly is provided on the side of the bottom of the feed port close to the feeding port of the forward belt conveyor and on the side of the partition plate close to the feeding port. A drying assembly for drying the core tube raw material is provided in the drying box, and a heating assembly for supplying hot air into the drying box is also provided on the side of the drying box.
2. A raw material drying device for producing polyethylene composite pipes according to claim 1, characterized in that: The forward belt conveyor comprises a first active belt roller whose two ends are rotatably connected to both sides of an inner wall of the drying box close to the feeding port, a first driven belt roller whose two ends are rotatably connected to both sides of an inner wall of the drying box away from the feeding port, and a first belt meshedly connected between the first active belt roller and the first driven belt roller, and the reverse belt conveyor comprises a second active belt roller whose two ends are rotatably connected to both sides of the inner wall of the drying box and located below the feeding port, a second driven belt roller whose two ends are rotatably connected to both sides of the inner wall of the drying box and located below the feeding port, and a second driven belt roller meshedly connected between the second active belt roller and the second driven belt roller. The belt and the belt discharge member include a third active belt roller whose two ends are rotatably connected to the inner walls of both sides of the drying box and are located directly below the discharge port of the forward belt feeding member near the discharge port, a third driven belt roller rotatably connected between the inner walls of both sides of the drying box and located directly above the discharge port, and a third belt meshingly connected between the third active belt roller and the third driven belt roller, the discharge port is respectively arranged between the first driven belt roller and the inner wall of one end of the drying box and between the second driven belt roller and the inner wall of the other end of the drying box, and a transmission component for driving the forward belt feeding member, the reverse belt feeding member and the belt discharge member to move is also provided on the side of the drying box.
3. A raw material drying device for producing polyethylene composite pipes according to claim 2, characterized in that: The transmission assembly includes a motor which is detachably rotatably mounted on the outside of the drying box and coaxially connected by one end of a first active belt roller, a forward chain transmission mechanism installed between two adjacent first driven belt rollers, a gear transmission mechanism installed between any adjacent second active belt roller and any first driven belt roller, and a synchronous chain transmission mechanism provided between a third active belt roller and any second active belt roller.
4. A raw material drying device for producing polyethylene composite pipes according to claim 3, characterized in that: The heating assembly includes an air inlet pipe arranged on the side of one end of the top of the drying box close to the feed port, an air outlet pipe arranged on the side of one end of the bottom of the drying box away from the third belt, a heating fan installed at the end of the air inlet pipe away from the drying box and used to introduce hot air into the air inlet pipe, and a controller for controlling the operation of the heating fan.
5. A raw material drying device for producing polyethylene composite pipes according to claim 4, characterized in that: The distance between the bottom end of the material limiting scraper in the drying box and the material feeding mechanism decreases from top to bottom.
6. A raw material drying device for producing polyethylene composite pipes according to claim 5, characterized in that: The bulk material frame comprises a bulk material plate connected between the end surface of the partition plate and the inner wall of the drying box and a plurality of bulk material chutes arranged in the bulk material plate and capable of accommodating the core tube raw materials to pass through, and a material dividing prism block is arranged between two adjacent bulk material chutes.
7. A raw material drying device for producing polyethylene composite pipes according to claim 6, characterized in that: The drying component includes a first electric heating plate arranged on the inner top of the drying box and above the feeding component, a second electric heating plate arranged on the bottom surface of the partition plate above the third belt, and a third electric heating plate arranged on the bottom surface of the partition plate above the first belt and the second belt. The first electric heating plate, the second electric heating plate and the third electric heating plate are all electrically connected to the controller.