Continuous drying device for lost foam coating

Abstract

The invention relates to the technical field of evanescent mode processing equipment, and provides a continuous drying device for evanescent mode paint, the continuous drying device comprises a conveying device, pre-drying boxes are installed at the top of the conveying device, and a plurality of sets of sealing cylinders are installed at the top of the inner wall of each pre-drying box; the top end of the sealing cylinder penetrates through the pre-drying box and is fixedly connected with a supporting cylinder. According to the device, a plurality of groups of heat-conducting fins are arranged on the outer surface of an exhaust pipe I, and the exhaust pipe I and an inner cavity of a sealing cylinder are sealed, so that hot air containing moisture can quickly exchange heat with the heat-conducting fins when passing through the surfaces of the heat-conducting fins downwards; and normal-temperature dry air downwards passing through the inner cavity of the exhaust pipe I and the surface of the heat-conducting fin quickly absorbs heat from the heat-conducting fin through the heat-conducting fin, so that the temperature of the normal-temperature dry air entering the inner cavity of the pre-drying box is increased, the drying effect on the evanescent mode is effectively improved, and heat energy from the normal-temperature dry air is recycled.

Description

Technical Field

[0001] The embodiments of this disclosure relate to the field of lost foam casting equipment technology, and more specifically, to a continuous drying apparatus for lost foam coatings. Background Technology

[0002] Lost foam casting refers to the casting process using high-polymer foam or foaming materials combined with vacuum technology. The process involves cutting foam models similar in size and shape to the casting into model clusters, applying refractory material, drying, and then vibrating them in quartz sand. Finally, under negative pressure, the model is subjected to high temperature and instantaneous vaporization, allowing liquid metal to occupy the model's position. After solidification and cooling, the casting is formed. The drying and shaping of the lost foam coating is crucial. To ensure uniform heating of the lost foam, prevent sand adhesion to the casting, and ensure a dense coating, current technologies typically employ continuous drying equipment to dry the lost foam coating. Patent CN202311819729.7 discloses a continuous drying device for lost foam coatings. It is equipped with a lead screw and slider to facilitate the movement of the lost foam, and is equipped with a drying chamber and a drying room for dehumidification and drying. However, its interior is relatively closed, mainly lacking energy recovery function. The hot air used for drying and dehumidification will carry away the moisture and be discharged directly. However, this moisture still contains a lot of heat. If it is discharged directly, the heating system will need to maintain a high heat output, resulting in a certain amount of energy waste. Therefore, this application is committed to realizing heat energy recovery and designing a continuous drying device for lost foam coatings to make it possible. Summary of the Invention

[0003] To overcome the above-mentioned defects, embodiments of this disclosure provide a continuous drying apparatus for lost foam coatings, which solves the technical problem of wasted drying air heat energy in related technologies.

[0004] This invention discloses a continuous drying apparatus for lost foam coatings, comprising a conveying device, wherein the top of the conveying device is respectively equipped with: A pre-drying oven is provided, wherein multiple sets of sealing cylinders are installed on the top of the inner wall of the pre-drying oven, the top of the sealing cylinders penetrates the pre-drying oven and is fixedly connected to a support cylinder, an exhaust pipe is fixedly connected between the bottom of the sealing cylinder and the support cylinder, the top of the exhaust pipe penetrates the support cylinder and is fixedly connected to a connecting pipe, a guide pipe is fixedly connected to the outer surface of the sealing cylinder, a dehydration box connected to the guide pipe is provided on the left side of the pre-drying oven, a fan is installed on the top of the dehydration box and connected to the connecting pipe, a heat-conducting plate is fixedly connected to the inner wall of the sealing cylinder, and a second fan is connected and installed on the rear side of the support cylinder. The drying chamber has multiple sets of exhaust pipes installed on the top of its inner wall. The top of each exhaust pipe penetrates the drying chamber and is fixedly connected to an exhaust duct. One end of the exhaust duct is connected to a hot air blower. An exhaust trough is fixedly installed on the rear side of the pre-drying box. A connecting pipe connects the exhaust trough to the blower.

[0005] Preferably, a feed door is fixedly installed on the left side of the pre-drying chamber, the dehydration chamber is installed on top of the feed door, and a discharge door is fixedly installed on the right side of the drying chamber.

[0006] Preferably, the bottom of the feed door, pre-drying box, drying chamber and discharge door are fixedly connected with sealing strips, and the bottom of the sealing strips abuts against the conveyor belt of the conveying device.

[0007] Preferably, a diffuser cylinder 2 is fixedly connected to the bottom of the first exhaust pipe, and a diffuser cylinder 1 is fixedly connected to the bottom of the second exhaust pipe. Both the second and first diffuser cylinders are horn-shaped.

[0008] Preferably, the outer surface of the exhaust pipe is provided with multiple sets of heat conduction grooves located inside the sealing cylinder. The multiple sets of heat conduction grooves are distributed equidistantly in a circle along the outer surface of the exhaust pipe. The heat conduction sheet is fixedly snapped into the heat conduction groove and is located in the inner cavity of both the exhaust pipe and the sealing cylinder.

[0009] Preferably, the heat-conducting sheet is made of brass, and the heat-conducting groove is sealed by the heat-conducting sheet.

[0010] Preferably, the pre-drying box has an air outlet on its rear side, and both the pre-drying box and the drying chamber have passage doors on both sides for lost foam to pass through.

[0011] Preferably, the guide pipe is located on the lower side of the outer surface of the sealing cylinder and connects the dehydration tank and the inner cavity of the sealing cylinder.

[0012] Preferably, the sealing strip is made of rubber or sponge blocks and is used to maintain a dynamic seal between the surfaces of the pre-drying box, drying chamber, feed door, discharge door, and conveying device.

[0013] Preferably, the drying chamber is located on the right side of the pre-drying box, and the height of the inlet door and the outlet door is less than the height of the pre-drying box and the drying chamber. The inlet door and the outlet door can simultaneously accommodate a set of lost foam casting.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: 1. This device has been redesigned to recover the heat energy from the hot drying air in the drying chamber after drying through a sealed isolation method. The recovered heat is directly transferred to the ambient temperature drying air in the pre-drying box, accelerating the dehumidification and drainage efficiency of the lost foam within the pre-drying box. To achieve this, the device uses multiple sets of sealing cylinders installed at the top of the pre-drying box, with support cylinders connected to the top of these cylinders. These support cylinders absorb the moisture-containing hot air from the drying chamber and deliver it to the support cylinders via exhaust ducts, connecting pipe two, and fan two. The interior is equipped with an exhaust duct, and a fan and a connecting pipe pump room temperature dry air into the exhaust duct. Multiple sets of heat-conducting fins are installed on the outer surface of the exhaust duct, and the exhaust duct and the inner cavity of the sealing cylinder are sealed. When the moisture-containing hot air passes downward through the surface of the heat-conducting fins, it will quickly exchange heat with the heat-conducting fins. Meanwhile, the room temperature dry air passing downward through the inner cavity of the exhaust duct and the surface of the heat-conducting fins will quickly absorb heat from the heat-conducting fins. This design increases the temperature of the room temperature dry air entering the inner cavity of the pre-drying chamber, thereby effectively improving the drying effect of the lost foam and recovering the heat energy from the room temperature dry air.

[0015] 2. Then, this device uses a smaller and narrower exhaust pipe to allow room temperature drying air to pass quickly downwards. By utilizing the size difference and cross-sectional area difference between the exhaust pipe and the connecting pipe, the speed of the room temperature drying air after entering the exhaust pipe is increased. The purpose is to allow the room temperature drying air to cool the heat-conducting plate by accelerating convection when it passes the heat-conducting plate surface located in the inner cavity of the exhaust pipe. This allows the air to quickly absorb heat from the surface of the heat-conducting plate, thus ensuring that the heat of the moisture-containing hot air is transferred as much as possible from the time it enters the inner cavity of the sealed cylinder until it leaves the sealed cylinder, avoiding heat energy waste.

[0016] 3. Finally, this device uses a heat-conducting plate to isolate the inner cavity of the sealing cylinder and the exhaust pipe, preventing the moisture in the hot air containing moisture in the sealing cylinder from being carried to the exhaust pipe and thus affecting the lost foam undergoing drying in the pre-drying chamber. The heat-conducting plate comes into contact with the hot air containing moisture and absorbs the heat from it. At this time, a large amount of moisture will inevitably adhere to the outer surface of the heat-conducting plate. The moisture adhering to the surface of the heat-conducting plate further enhances the uniform heat dissipation energy of the heat-conducting plate, so that the heat distribution on the surface of the heat-conducting plate can be more uniform. Under the action of the room temperature dry air flowing rapidly downward in the inner cavity of the exhaust pipe, the heat of the hot air containing moisture can be absorbed more quickly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the sealing cylinder, support cylinder, exhaust pipe one, connecting pipe one, dehydration box, fan one, fan two, connecting pipe two, exhaust pipe two, and exhaust duct of the present invention. Figure 2 This is a frontal perspective view of the entire structure of the present invention; Figure 3 This is a three-dimensional rear view of the overall structure of the present invention; Figure 4 This is a front sectional view of the entire structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A; Figure 6 This is a side sectional view of the overall structure of the present invention; Figure 7 This is a schematic diagram of the pre-drying box, drying chamber, feed door, discharge door, and sealing strip of the present invention.

[0019] The components are as follows: 1. Conveying device; 2. Pre-drying box; 3. Drying chamber; 4. Feed door; 5. Discharge door; 6. Sealing strip; 7. Sealing cylinder; 8. Support cylinder; 9. Exhaust pipe one; 10. Connecting pipe one; 11. Dehydration box; 12. Fan one; 13. Fan two; 14. Connecting pipe two; 15. Exhaust pipe two; 16. Exhaust duct; 17. Hot air blower; 18. Diffuser one; 19. Exhaust trough; 20. Diffuser two; 21. Heat conduction groove; 22. Heat conduction plate; 23. Guide pipe; 24. Air outlet. Detailed Implementation

[0020] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0021] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0023] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1-7 As shown, a continuous drying apparatus for lost foam coatings disclosed herein is illustrated, comprising a conveying device 1, the top of which is respectively equipped with: The pre-drying box 2 has multiple sets of sealing cylinders 7 installed on the top of its inner wall. The top of the sealing cylinder 7 passes through the pre-drying box 2 and is fixedly connected to a support cylinder 8. An exhaust pipe 9 is fixedly connected between the bottom of the sealing cylinder 7 and the support cylinder 8. The top of the exhaust pipe 9 passes through the support cylinder 8 and is fixedly connected to a connecting pipe 10. A guide pipe 23 is fixedly connected to the outer surface of the sealing cylinder 7. A dehydration box 11 connected to the guide pipe 23 is provided on the left side of the pre-drying box 2. A fan 12 connected to the connecting pipe 10 is installed on the top of the dehydration box 11. A heat-conducting plate 22 is fixedly connected to the inner wall of the sealing cylinder 7. A second fan 13 is connected to the rear side of the support cylinder 8. The air used for drying the lost foam in the inner cavity of the pre-drying box 2 is room temperature dry air. The drying chamber 3 has multiple sets of exhaust pipes 15 installed on the top of its inner wall. The top of the exhaust pipes 15 passes through the drying chamber 3 and is fixedly connected to an exhaust duct 16. One end of the exhaust duct 16 is connected to a hot air blower 17. An exhaust trough 19 is fixedly installed on the rear side of the pre-drying box 2. A connecting pipe 14 connects the exhaust trough 19 and the blower 13. The air used for drying the lost foam in the inner cavity of the drying chamber 3 is hot air containing moisture. This device has been redesigned to recover the heat energy from the hot drying air in the drying chamber 3 after drying through a sealed isolation method. The recovered heat is then directly transferred to the ambient temperature drying air in the pre-drying chamber 2, accelerating the dehumidification and drainage efficiency of the lost foam within the pre-drying chamber 2. To achieve this, the device installs multiple sets of sealing cylinders 7 at the top of the pre-drying chamber 2, with support cylinders 8 connected to the top of each sealing cylinder 7. These support cylinders absorb the moisture-containing hot air from the dried air in the drying chamber 3 and deliver it to the support cylinders 8 through exhaust ducts 19, connecting pipe 14, and fan 13. The device also incorporates internal design features within the support cylinders 8 and sealing cylinders 7. An exhaust duct 9 is provided, and a fan 12 and a connecting pipe 10 pump room temperature dry air into the exhaust duct 9. Multiple sets of heat-conducting fins 22 are provided on the outer surface of the exhaust duct 9, and the inner cavity of the exhaust duct 9 and the sealing cylinder 7 are sealed. When the hot air containing moisture passes downward through the surface of the heat-conducting fins 22, it will quickly exchange heat with the heat-conducting fins 22. Meanwhile, the room temperature dry air passing downward through the inner cavity of the exhaust duct 9 and the surface of the heat-conducting fins 22 will quickly absorb heat from the heat-conducting fins 22. This design increases the temperature of the room temperature dry air entering the inner cavity of the pre-drying chamber 2, thereby effectively improving the drying effect of the lost foam and recovering the heat energy from the room temperature dry air.

[0027] Then, this device is equipped with a smaller and narrower exhaust pipe 9, which allows the room temperature drying air to pass quickly downwards. By utilizing the size difference and cross-sectional area difference between the exhaust pipe 9 and the connecting pipe 10, the speed of the room temperature drying air after entering the exhaust pipe 9 is increased. The purpose is to allow the room temperature drying air to accelerate convection and cool the heat-conducting plate 22 when it passes through the heat-conducting plate 22 and is located in the inner cavity of the exhaust pipe 9. This allows the air to quickly absorb the heat from the surface of the heat-conducting plate 22, thereby ensuring that the heat of the moisture-containing hot air can be transferred as much as possible from the time it enters the inner cavity of the sealing cylinder 7 until it leaves the sealing cylinder 7, thus avoiding heat energy waste.

[0028] Finally, this device uses the heat-conducting plate 22 to isolate the inner cavity of the sealing cylinder 7 and the exhaust pipe 9, preventing the moisture in the hot air containing moisture in the sealing cylinder 7 from being carried to the exhaust pipe 9, thereby affecting the lost foam that is undergoing drying in the inner cavity of the pre-drying chamber 2. The heat-conducting plate 22 comes into contact with the hot air containing moisture and absorbs the heat therein. At this time, a large amount of moisture will inevitably adhere to the outer surface of the heat-conducting plate 22. The moisture adhering to the surface of the heat-conducting plate 22 further enhances the uniform heat dissipation energy of the heat-conducting plate 22, so that the heat distribution on the surface of the heat-conducting plate 22 can be more uniform. Under the action of the room temperature dry air flowing rapidly downward in the inner cavity of the exhaust pipe 9, the heat of the hot air containing moisture can be absorbed more quickly.

[0029] In this embodiment, a feed door 4 is fixedly installed on the left side of the pre-drying box 2, a dehydration box 11 is installed on top of the feed door 4, and a discharge door 5 is fixedly installed on the right side of the drying chamber 3. The feed gate 4 and discharge gate 5 mainly provide transition channels for the lost foam to enter the device, namely the pre-drying box 2 and the drying chamber 3. The purpose is to reduce heat loss in the drying chamber 3. The narrow feed gate 4 can prevent the heat of the hot air ejected from the diffuser tube 18 from escaping out of the device and avoid heat loss of the device.

[0030] In this embodiment, sealing strips 6 are fixedly connected to the bottom of the feed door 4, the pre-drying box 2, the drying chamber 3 and the discharge door 5, and the bottom of the sealing strips 6 abuts against the conveyor belt of the transmission device 1. The sealing strip 6 is responsible for sealing the space between the bottom of the device and the top of the transmission device 1, and preventing the heat of the device from being dissipated and wasted.

[0031] In this embodiment, a diffuser cylinder 20 is fixedly connected to the bottom of the exhaust pipe 9, and a diffuser cylinder 18 is fixedly connected to the bottom of the exhaust pipe 15. Both the diffuser cylinder 20 and the diffuser cylinder 18 are horn-shaped. The horn-shaped design of diffuser tube 20 and diffuser tube 18 helps to diffuse the drying gas discharged from exhaust pipe 19 and exhaust pipe 25, so that it can effectively cover the moving lost foam surface and help the drying operation of the device.

[0032] In this embodiment, multiple sets of heat conduction grooves 21 are provided on the outer surface of the exhaust pipe 9 located inside the sealing cylinder 7. The multiple sets of heat conduction grooves 21 are distributed equidistantly in a circle along the outer surface of the exhaust pipe 9. The heat conduction sheet 22 is fixedly snapped into the heat conduction groove 21 and is located in the inner cavity of both the exhaust pipe 9 and the sealing cylinder 7. like Figure 5 As shown, the heat-conducting plate 22 is fixed in the heat-conducting groove 21, which is used to seal the heat-conducting groove 21 and prevent the space of the sealing cylinder 7 and the exhaust pipe 9 from communicating with each other.

[0033] In this embodiment, the heat-conducting sheet 22 is made of brass, and the heat-conducting groove 21 is sealed by the heat-conducting sheet 22; The heat-conducting plate 22 has strong thermal conductivity, and brass also exhibits good corrosion resistance and oxidation resistance when in contact with water.

[0034] In this embodiment, an air outlet 24 is provided on the rear side of the pre-drying box 2, and both sides of the pre-drying box 2 and the drying chamber 3 are provided with passage doors for lost foam to pass through. like Figure 4 As shown, in the pre-drying chamber 2, the dry air that is discharged through the exhaust pipe 9 and used to dry the surface of the lost foam will be directly discharged along the air outlet 24, taking away most of the moisture, thus providing a basis for the subsequent heat drying of the lost foam in the drying chamber 3.

[0035] In this embodiment, the guide pipe 23 is located on the lower side of the outer surface of the sealing cylinder 7 and connects the dehydration tank 11 and the inner cavity of the sealing cylinder 7. like Figure 4 As shown, the guide pipe 23 is used to connect the lower side of multiple sets of sealing cylinders 7 and is responsible for guiding the hot air containing moisture after heat exchange to the dehydration box 11 for drying, so that it is dehydrated, and then recirculated into the connecting pipe 10 and the exhaust pipe 9 by the fan 12 to squeeze out the last bit of residual heat.

[0036] In this embodiment, the sealing strip 6 is made of rubber block or sponge block, and the sealing strip 6 is used to maintain the dynamic seal between the surfaces of the pre-drying box 2, drying chamber 3, feed door 4, discharge door 5 and conveying device 1. Since the conveyor belt on the surface of the transmission device 1 needs to move continuously, the material in contact with it must be wear-resistant and durable. Both sets of materials in this case meet this performance index, and the sponge block becomes sealed after absorbing water.

[0037] In this embodiment, the drying chamber 3 is located on the right side of the pre-drying box 2. The heights of the feed door 4 and the discharge door 5 are both less than the heights of the pre-drying box 2 and the drying chamber 3. The feed door 4 and the discharge door 5 can simultaneously accommodate a set of lost foam casting. The feed gate 4 and discharge gate 5 provide a transition space for the lost foam to enter the device and prevent the hot air of the device from being discharged from the inlet and outlet areas of the device, thus avoiding waste.

[0038] Working principle: When this device is in operation: First, place the lost foam coated with refractory material on the left side of the conveying device 1. Start the blower 12 and pump the dry air from the dehydration tank 11 into the exhaust pipe 9 through the connecting pipe 10. Finally, spray room temperature dry air vertically downwards through the diffuser 20. At the same time, start the hot air blower 17 and send hot air into the diffuser 18 through the exhaust pipe 16. Start the conveying device 1 and move the lost foam to the right. Figure 4 As shown, the lost foam passes through the feed gate 4 in sequence under the action of the conveying device 1 and enters the inner cavity of the pre-drying box 2. At this time, the lost foam is dried by the room temperature dry air coming vertically downward from the diffuser cylinder 20, and most of the moisture is blown away. The air is discharged along the air outlet 24. Then, the lost foam continues to enter the inner cavity of the drying chamber 3 to the right. Hot air from the diffuser 18 and the exhaust pipe 15 begins to deeply dry and finally dry the surface of the lost foam. Then, the dried lost foam leaves the device through the discharge gate 5. The hot air passing over the surface of the lost foam carries away a large amount of moisture and is discharged along the exhaust duct 19. The fan 13 is started, and the hot air with high moisture content is pumped into the support cylinder 8 through the connecting pipe 14 and continues to flow downward through the inner cavity of the sealing cylinder 7. At this time, the inner cavity of the sealing cylinder 7 begins to complete the heat exchange operation: as follows Figure 5 As shown, when hot air from the exhaust duct 19 passes over the surface of the heat-conducting plate 22, it will transfer heat to the heat-conducting plate 22. At this time, the heat-conducting plate 22 heats the room temperature dry air passing through the inner cavity of the exhaust pipe 9. The high-speed flowing warm dry air quickly carries away the heat from the surface of the heat-conducting plate 22 through thermal convection, thus utilizing the last bit of heat energy from the hot air in the exhaust duct 19. Finally, the heat from the hot air after heat exchange is transferred to the heat-conducting plate 22, and then enters the dehydration box 11 for drying. It is still preheated and is drawn into the connecting pipe 10 by the fan 12, and then circulated into the exhaust pipe 9 to replenish the room temperature dry air in the cavity of the pre-drying box 2.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A continuous drying apparatus for lost foam coatings, comprising a conveying device (1), characterized in that, The top of the transmission device (1) is respectively equipped with: A pre-drying box (2) has multiple sets of sealing cylinders (7) installed on the top of its inner wall. The top of the sealing cylinder (7) passes through the pre-drying box (2) and is fixedly connected to a support cylinder (8). An exhaust pipe (9) is fixedly connected between the bottom of the sealing cylinder (7) and the support cylinder (8). The top of the exhaust pipe (9) passes through the support cylinder (8) and is fixedly connected to a connecting pipe (10). A guide pipe (23) is fixedly connected to the outer surface of the sealing cylinder (7). A dehydration box (11) connected to the guide pipe (23) is provided on the left side of the pre-drying box (2). A fan (12) connected to the connecting pipe (10) is installed on the top of the dehydration box (11). A heat-conducting plate (22) is fixedly connected to the inner wall of the sealing cylinder (7). A second fan (13) is connected to the rear side of the support cylinder (8). The drying chamber (3) has multiple sets of exhaust pipes (15) installed on the top of the inner wall of the drying chamber (3). The top of the exhaust pipes (15) passes through the drying chamber (3) and is fixedly connected to an exhaust duct (16). One end of the exhaust duct (16) is connected to a hot air blower (17). An exhaust trough (19) is fixedly installed on the rear side of the pre-drying box (2). A connecting pipe (14) connects the exhaust trough (19) and the blower (13).

2. The continuous drying apparatus for lost foam coating according to claim 1, characterized in that, The pre-drying chamber (2) is fixedly equipped with a feed door (4) on the left side, the dehydration chamber (11) is installed on top of the feed door (4), and the drying chamber (3) is fixedly equipped with a discharge door (5) on the right side.

3. A continuous drying apparatus for lost foam coating according to claim 2, characterized in that, The bottom of the feed gate (4), pre-drying box (2), drying chamber (3) and discharge gate (5) are fixedly connected with sealing strips (6), and the bottom of the sealing strips (6) abuts against the conveyor belt of the transmission device (1).

4. A continuous drying apparatus for lost foam coating according to claim 3, characterized in that, The bottom of the first exhaust pipe (9) is fixedly connected to the second diffuser (20), and the bottom of the second exhaust pipe (15) is fixedly connected to the first diffuser (18). The second diffuser (20) and the first diffuser (18) are both horn-shaped.

5. A continuous drying apparatus for lost foam coating according to claim 4, characterized in that, The outer surface of the exhaust pipe (9) located inside the sealing cylinder (7) has multiple sets of heat conduction grooves (21). The multiple sets of heat conduction grooves (21) are distributed equidistantly in a circle along the outer surface of the exhaust pipe (9). The heat conduction sheet (22) is fixedly snapped into the heat conduction groove (21) and is located in the inner cavity of both the exhaust pipe (9) and the sealing cylinder (7).

6. A continuous drying apparatus for lost foam coating according to claim 5, characterized in that, The heat-conducting plate (22) is made of brass, and the heat-conducting groove (21) is sealed by the heat-conducting plate (22).

7. A continuous drying apparatus for lost foam coating according to claim 6, characterized in that, An air outlet (24) is provided on the rear side of the pre-drying box (2), and a passage door for lost foam to pass through is provided on both sides of the pre-drying box (2) and the drying chamber (3).

8. A continuous drying apparatus for lost foam coating according to claim 7, characterized in that, The guide pipe (23) is located on the lower side of the outer surface of the sealing cylinder (7) and connects the dehydration tank (11) and the inner cavity of the sealing cylinder (7).

9. A continuous drying apparatus for lost foam coating according to claim 8, characterized in that, The sealing strip (6) is made of rubber or sponge blocks and is used to maintain a dynamic seal between the surfaces of the pre-drying box (2), the drying chamber (3), the feed door (4), the discharge door (5) and the conveying device (1).

10. A continuous drying apparatus for lost foam coating according to claim 9, characterized in that, The drying chamber (3) is located on the right side of the pre-drying box (2). The height of the feed door (4) and the discharge door (5) is less than the height of the pre-drying box (2) and the drying chamber (3). The feed door (4) and the discharge door (5) can simultaneously accommodate a set of lost foam casting.

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