Mold preheating and spraying unit

Abstract

The utility model relates to the technical field of mold processing, and discloses a mold preheating and spraying unit which comprises a frame, a conveying belt is installed at the bottom of the frame, ferrules are fixedly connected to the two sides of the outer portion of the conveying belt, a plurality of division bars are fixedly connected to the middle of the conveying belt, and a spraying assembly is installed in the middle of the frame. A preheating bin is fixedly connected to one side of the interior of the frame, an electric heating wire is fixedly connected to one side of the interior of the preheating bin, a plurality of elastic ropes are fixedly connected to the other side of the interior of the preheating bin, a plurality of cleaning belts are fixedly connected to the outer sides of the elastic ropes, and an air blower is fixedly connected to one side of the edge of the top of the frame. According to the mold cleaning device, the elastic rope and the cleaning belt are driven by high-pressure air flow conveyed by the air blower to clean the mold, and the cleaned dust is conveyed into the filter bin through the recovery pipe and the spiral pipe to be stored, so that dust or other impurities are not attached to or adhered to the pretreated mold, and the spraying quality of the mold is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mold processing, in particular to a mold preheating spraying unit. Background Art

[0002] During the casting process of workpieces made of some materials, metal molds are required, and coatings need to be sprayed on the mold surface to improve the heat preservation of the mold, the fluidity of the molten metal, and the appearance quality of the piston. The mold is preheated in advance, and then the preheated mold is sent to the spraying unit for spraying, and then the mold is cooled and the coating solidifies before use.

[0003] At present, the traditional mold preheating spraying unit consists of three parts, namely, preheating group, spraying group and cooling group. The mold is heated in the preheating box and then placed in the spraying equipment. After the spraying is completed in the spraying equipment, it is placed in the cooling equipment for cooling.

[0004] During use, the various components of the mold preheating spray unit are used separately, and the mold needs to be continuously transferred to the corresponding components for processing. This will cause the mold itself and the mold to be easily attached with dust and other impurities after spraying, resulting in the dust on the mold being bonded to the coating after cooling and shaping, affecting the subsequent use of the mold. For this reason, a mold preheating spray unit is proposed. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a mold preheating spray unit, which aims to improve the problem that the various components of the mold preheating spray unit in the prior art are used separately, and the mold needs to be continuously transferred to the corresponding component for processing during the process, which will cause the mold itself and the mold to be easily attached with dust and other impurities after spraying.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a mold preheating spraying unit, comprising a frame, a conveyor belt is installed at the bottom of the frame, both sides of the outside of the conveyor belt are fixedly connected with rings, a plurality of partitions are fixedly connected to the middle of the conveyor belt, a spraying assembly is installed in the middle of the frame, a preheating bin is fixedly connected to one side of the interior of the frame, a heating wire is fixedly connected to one side of the interior of the preheating bin, a plurality of elastic ropes are fixedly connected to the other side of the interior of the preheating bin, a plurality of cleaning belts are fixedly connected to the outside of the elastic ropes, a blower is fixedly connected to one side of the top edge of the frame, an air inlet pipe is connected between the output end of the blower and the interior of the preheating bin, an energy recovery assembly is installed on the other side of the top edge of the frame, a filter assembly is installed on the middle side of the top of the frame, a cooling bin is fixedly connected to the other side of the interior of the frame, a diffuser is fixedly connected to the interior of the cooling bin, and three sealing plates are fixedly connected to the interior of the frame.

[0007] As a further description of the above technical solution:

[0008] The spraying assembly comprises a multi-axis frame, both sides of which are mounted on the middle of the inner wall of the frame, and a spray head is mounted on the bottom of the multi-axis frame.

[0009] As a further description of the above technical solution:

[0010] The energy recovery component includes a cooling jacket, a heat dissipation bin and a delivery pump. The bottom of the cooling jacket is fixedly connected to the top of the frame, a spiral tube is fixedly connected to the inside of the cooling jacket, the bottom end of the spiral tube passes through the cooling jacket and is fixedly connected to a recovery tube, the bottom end of the recovery tube is connected to the inside of the preheating bin, the bottom of the heat dissipation bin is fixedly connected to the top of the frame on one side close to the blower, a plurality of heat dissipation fins are fixedly connected to both sides of the outside of the heat dissipation bin, the inside of the heat dissipation bin and the cooling jacket are connected via a pipeline, the bottom of the delivery pump is fixedly connected to the top of the frame, the input end of the delivery pump and the inside of the heat dissipation bin are connected via a pipeline, and the output end of the delivery pump and the inside of the cooling jacket are connected via a pipeline.

[0011] As a further description of the above technical solution:

[0012] The filter assembly includes a filter bin and a driving pulley, the bottom of the filter bin is fixedly connected to the side of the top of the frame away from the cooling jacket, the inside of the filter bin is communicated with the spiral tube, the inner wall of the filter bin is fixedly connected with a dust screen, the inside of the filter bin is rotatably connected with a rotating shaft, the outer periphery of the rotating shaft is fixedly connected with a cam, the front end of the rotating shaft is fixedly connected with a driven pulley, the middle part of the driving pulley is installed on the outside of the conveyor belt, a belt is sleeved between the driven pulley and the driving pulley, and the side of the inside of the filter bin away from the spiral tube is communicated with the cooling bin through a pipeline.

[0013] As a further description of the above technical solution:

[0014] The blower input end is fixedly connected with an air inlet, and the air inlet is located on a side of the heat dissipation fin away from the heat dissipation bin.

[0015] As a further description of the above technical solution:

[0016] The bottom of the sealing plate is slidably connected to the spacer and the top of the ring, wherein two of the sealing plates are respectively located on both sides of the cooling bin, and another sealing plate is located on one side of the preheating bin close to the cooling bin.

[0017] As a further description of the above technical solution:

[0018] The bottom of the preheating chamber is slidably connected to the ferrule and the top of the spacer, and the bottom of the cooling chamber is located above the spacer.

[0019] The utility model has the following beneficial effects:

[0020] 1. In the utility model, the high-pressure airflow delivered by the blower drives the elastic rope and the cleaning belt to clean the mold, and the cleaned dust is transported to the filter bin for storage through the recovery pipe and the spiral pipe. During the process, the three sealing plates can ensure the sealing inside the frame. When the conveyor belt is running, the preheating bin and the cooling bin will blow air to the outside to prevent dust from entering the frame when the conveyor belt is running, so that the pretreated mold will not have dust or other impurities attached or bonded, thereby improving the quality of mold spraying.

[0021] 2. In the utility model, the hot air discharged after preheating is retained as much as possible inside the cooling jacket through the recovery pipe and the spiral pipe. Then, the delivery pump is started to circulate the water flow between the cooling jacket and the heat dissipation bin continuously, so that the heat in the preheated air can be recovered, so that the spray unit can make the mold reach the preheating temperature faster in the subsequent preheating process, reduce the time required for preheating, improve work efficiency and reduce power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A stereoscopic diagram of a mold preheating spray unit proposed by the utility model from a first viewing angle;

[0023] Figure 2 A stereoscopic diagram of a mold preheating spraying unit proposed by the utility model from a second viewing angle;

[0024] Figure 3 This is a schematic diagram of the internal structure of a frame of a mold preheating spraying unit proposed by the utility model;

[0025] Figure 4 This is a schematic diagram of the filter chamber structure of a mold preheating spraying unit proposed by the utility model;

[0026] Figure 5 This is a schematic diagram of the heating wire structure of a mold preheating spray unit proposed by the utility model;

[0027] Figure 6 This is a schematic diagram of the spiral tube structure of a mold preheating spraying unit proposed by the utility model;

[0028] Figure 7 The utility model is a schematic diagram of the dustproof net structure of the mold preheating spraying unit.

[0029] Legend:

[0030] 1. Frame; 2. Conveyor belt; 3. Ring; 4. Spacer; 5. Multi-axis frame; 6. Nozzle; 7. Preheating chamber; 8. Heating wire; 9. Elastic rope; 10. Cleaning belt; 11. Blower; 12. Air inlet pipe; 13. Cooling jacket; 14. Spiral pipe; 15. Recovery pipe; 16. Heat dissipation chamber; 17. Heat dissipation fins; 18. Delivery pump; 19. Cooling chamber; 20. Diffuser plate; 21. Filter chamber; 22. Dust net; 23. Rotating shaft; 24. Cam; 25. Driven pulley; 26. Driving pulley; 27. Air inlet; 28. Sealing plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 5 The utility model provides an embodiment: a mold preheating spraying unit, including a frame 1, a conveyor belt 2 is installed at the bottom of the frame 1, and the mold to be processed will be continuously sent into the preheating spraying unit through the operation of the conveyor belt 2, and there is no need to manually transfer the mold for each process. Rings 3 are fixedly connected to both sides of the outside of the conveyor belt 2, and a plurality of partitions 4 are fixedly connected to the middle of the conveyor belt 2. The molds placed on the conveyor belt 2 can be limited by the rings 3 and the partitions 4, so that each mold will be placed in the frame formed by the rings 3 and the partitions 4, which is convenient for the subsequent preheating spraying of the mold. A spraying assembly is installed in the middle of the frame 1, and the spraying operation of the preheated mold can be effectively completed through the spraying assembly to ensure that a uniform coating is formed on the surface of the mold. A preheating bin 7 is fixedly connected to one side of the interior of the frame 1, an electric heating wire 8 is fixedly connected to one side of the interior of the preheating bin 7, a plurality of elastic ropes 9 are fixedly connected to the other side of the interior of the preheating bin 7, a plurality of cleaning belts 10 are fixedly connected to the outside of the elastic ropes 9, a blower 11 is fixedly connected to one side of the top edge of the frame 1, an air inlet pipe 12 is connected between the output end of the blower 11 and the interior of the preheating bin 7, the air blown into the preheating bin 7 by the blower 11 is heated through the electric heating wire 8, and the mold is preheated, and at the same time, the high-pressure gas entering the preheating bin 7 will blow the elastic ropes 9 and the cleaning belt 10, and the surface of the mold located below will be cleaned through the rapid vibration and shaking of the cleaning belt 10.

[0033] Reference Figure 2 , Figure 4 and Figure 7, an energy recovery component is installed on the other side of the top edge of the frame 1. The energy recovery component can effectively recover the heat of the preheated air, and then the air entering the blower 11 is heated by the recovered heat, thereby ensuring that the air entering the preheating chamber 7 has an initial temperature, so that the air required for preheating can be quickly heated up, thereby improving the preheating effect on the mold. A filter component is installed on the middle side of the top of the frame 1. The filter component can effectively filter the air delivered to the cooling chamber 19 to ensure that there will be no impurities or dust in the gas blown on the mold that has just been sprayed. A cooling chamber 19 is fixedly connected to the other side of the frame 1. A diffuser plate 20 is fixedly connected to the cooling chamber 19. The air discharged from the cooling chamber 19 will be diverted and dispersed by the diffuser plate 20, and then the cooled air is blown on the surface of the mold, so that the mold after preheating and spraying can be quickly cooled down, accelerating the time required for the sprayed coating to solidify. Three sealing plates 28 are fixedly connected inside the frame 1. The three sealing plates 28 can not only ensure that the three parts of the preheating, spraying and cooling structures do not interfere with each other, but also the two sealing plates 28 on both sides can prevent dust from entering the interior of the frame 1, so that the mold will not be attached with dust during the processing and the transportation efficiency will not be affected.

[0034] Reference Figure 3 and Figure 4 The bottom of the sealing plate 28 is slidably connected to the top of the spacer bar 4 and the ferrule 3. When the sealing plate 28 is located at the top of the spacer bar 4 and the ferrule 3, the mold in the frame above the conveyor belt 2 will be correspondingly below the preheating bin 7, the nozzle 6 and the cooling bin 19, and the sealing plate 28 is in contact with the spacer bar 4 and the ferrule 3 to seal the interior of the frame 1 to prevent dust from entering the interior of the frame 1. Two of the sealing plates 28 are located on both sides of the cooling bin 19, and the other sealing plate 28 is located on the side of the preheating bin 7 close to the cooling bin 19. The three sealing plates 28 separate the three parts of the unit, which not only insulates heat but also seals. The bottom of the preheating bin 7 is slidably connected to the top of the ferrule 3 and the spacer bar 4. Through the contact between the preheating bin 7 and the ferrule 3 and the spacer bar 4, it is ensured that a closed space is formed between the preheating bin 7 and the frame structure on the conveyor belt 2. The bottom of the cooling bin 19 is located above the partition bar 4. The air gushing out from the cooling bin 19 will be discharged from the gap between the sealing plate 28 and the ring 3. When the conveyor belt 2 moves to separate the partition bar 4 at the bottom of the sealing plate 28, the gap in this stroke can allow the high-pressure gas inside the frame 1 to be discharged outward, so that the sealing gap generated when the spray unit is started can generate an outward discharge airflow to prevent dust from entering the interior of the frame 1.

[0035] Reference Figure 3 and Figure 4The spraying assembly includes a multi-axis frame 5, both sides of which are mounted on the middle of the inner wall of the frame 1, and a spray head 6 is mounted on the bottom of the multi-axis frame 5. The multi-axis frame 5 is composed of two vertical and horizontal electric slide rails, so that the spray head 6 can move horizontally above the conveyor belt 2, ensuring that the spray head 6 can cover the surface of the mold when spraying.

[0036] Reference Figure 2 , Figure 4 and Figure 6 The energy recovery component includes a cooling jacket 13, a heat sink 16 and a delivery pump 18. The bottom of the cooling jacket 13 is fixedly connected to the top of the frame 1. A spiral tube 14 is fixedly connected inside the cooling jacket 13. The bottom end of the spiral tube 14 passes through the cooling jacket 13 and is fixedly connected to a recovery tube 15. The bottom end of the recovery tube 15 is connected to the inside of the preheating bin 7. The air inside the preheating bin 7 will enter the inside of the spiral tube 14 through the recovery tube 15, and then the heat of the air flowing inside the spiral tube 14 is recovered by means of the cooling jacket 13. The bottom of the heat sink 16 is fixedly connected to the top of the frame 1 on one side close to the blower 11. Both sides of the outside of the heat sink 16 are fixedly connected to a plurality of heat fins 17. The inside of the heat sink 16 and the cooling jacket 13 are connected through a pipeline. The bottom of the delivery pump 18 is fixedly connected to the top of the frame 1. The input end of the delivery pump 18 and the inside of the heat sink 16 are connected through a pipeline. The output end of the delivery pump 18 and the inside of the cooling jacket 13 are connected through a pipeline. The input end of the blower 11 is fixedly connected with an air inlet 27, and the air inlet 27 is located on the side of the heat sink 17 away from the heat sink 16. When the delivery pump 18 is started, the water inside the heat sink 16 will be pumped out and injected into the cooling jacket 13 along the pipeline, so that the water flow inside the cooling jacket 13 begins to circulate and enter the heat sink 16. During the process, the heat of the preheated air circulating inside the cooling jacket 13 will be quickly absorbed by the water flow, and then the air will be quickly cooled. At the same time, the water flow after absorbing heat will enter the heat sink 16, and the heat sink fins 17 distributed on the outside of the heat sink 16 will quickly dissipate the heat from the cooling water to the outside, and at this time, the air inlet 27 on the input end of the blower 11 will quickly absorb the surrounding air and heat, and then deliver it to the preheating bin 7, so that the air entering the preheating bin 7 for preheating can obtain an initial temperature.

[0037] Reference Figure 3 , Figure 4 and Figure 7The filter assembly includes a filter bin 21 and a driving pulley 26. The bottom of the filter bin 21 is fixedly connected to the side of the top of the frame 1 away from the cooling jacket 13. The inside of the filter bin 21 is connected to the spiral tube 14, so that the dust and other impurities entrained in the air entering the preheating bin 7 will enter the spiral tube 14, and then the spiral tube 14 will send the air and dust into the filter bin 21. A dustproof net 22 is fixedly connected to the inner wall of the filter bin 21, and a rotating shaft 23 is rotatably connected to the inside of the filter bin 21. A cam 24 is fixedly connected to the outer periphery of the rotating shaft 23. A driven pulley 25 is fixedly connected to the front end of the rotating shaft 23. The middle part of the driving pulley 26 is installed on the outside of the conveyor belt 2. A belt is sleeved between the driven pulley 25 and the driving pulley 26. The side of the filter bin 21 away from the spiral tube 14 and the cooling bin 19 are connected through a pipeline. The air will pass through the dustproof net 22 and enter the cooling chamber 19. Since the heat of the air has been recovered, the air entering the cooling chamber 19 will be diverted and dispersed by the diffuser 20 after passing through the diffuser 20, so that the air can be directly blown onto the mold after spraying, and the residual temperature of the mold can be quickly cooled. At the same time, the dust in the air passing through the filter chamber 21 will be blocked by the dustproof net 22, so as to avoid dust remaining in the air blown onto the mold after spraying, and ensure that the quality of the processed mold meets the standards.

[0038] Working principle: When the mold is preheated, the mold is transported to the conveyor belt 2 by a robot arm or a conveying device, and the mold is placed between two adjacent partition bars 4. Then the conveyor belt 2 is started to drive the mold to be transported into the device. When a mold is transported to the bottom of the preheating bin 7, the blower 11 is started to compress the air into the preheating bin 7 through the air inlet pipe 12. The air is heated by the electric heating wire 8 and then blown into the mold inside the preheating bin 7 to achieve preheating of the mold. The wind force blown into the preheating bin 7 will vibrate the elastic rope 9 and the cleaning belt 10, and then the cleaning belt 10 will shake quickly to clean the dust on the mold and remove it from the surface of the mold.

[0039] At the same time, due to the closed space formed by the preheating chamber 7, the conveyor belt 2, the ring 3 and the spacer 4, the preheated air will directly enter the spiral tube 14 through the recovery pipe 15. At the same time, the delivery pump 18 will start to pump out the water in the heat dissipation chamber 16 and inject it into the cooling jacket 13 along the pipeline, so that the water flow in the cooling jacket 13 starts to circulate and enter the heat dissipation chamber 16. During the process, the heat of the preheated air circulating in the cooling jacket 13 will be quickly absorbed by the water flow, and then the air will be quickly cooled down. At the same time, the water flow after absorbing heat will enter the heat dissipation bin 16, and the heat dissipation fins 17 distributed on the outside of the heat dissipation bin 16 will quickly dissipate the heat from the cooling water to the outside. At this time, the air inlet 27 on the input end of the blower 11 will quickly absorb the surrounding air and heat, and then transport them to the preheating bin 7, so that the air entering the preheating bin 7 for preheating can obtain an initial temperature, thereby ensuring that the preheated air can quickly reach the predetermined preheating temperature with the cooperation of the electric heating wire 8, thereby improving the preheating efficiency of the mold, and can effectively reduce the time required for preheating the mold and reduce the power consumption of the equipment when it is working.

[0040] The preheated mold will be transported by the conveyor belt 2 and then sprayed through the spraying assembly. After spraying, it will continue to be transported to the bottom of the cooling bin 19. At the same time, the high-pressure air released from the preheating bin 7 will carry the cleaned dust from the recovery pipe 15 and the spiral pipe 14 into the filter bin 21. The air will then pass through the dustproof net 22 and enter the cooling bin 19. Since the heat of the air has been recovered, the air entering the cooling bin 19 will be diverted and dispersed by the diffuser plate 20 after passing through the diffuser plate 20, so that the air can be directly blown onto the mold after spraying to quickly cool down the residual temperature of the mold. At the same time, the dust in the air passing through the filter bin 21 will be blocked by the dustproof net 22 to avoid dust residue in the air blown on the sprayed mold, ensuring that the quality of the processed mold meets the standards. At the same time, as the conveyor belt 2 is running to transport the mold for processing, the roller on the conveyor belt 2 will drive the active pulley 26 to rotate, and with the cooperation of the belt, it will drive the driven pulley 25 to rotate, thereby driving the cam 24 to rotate and continuously hit the bottom of the dustproof net 22, and quickly shake off the dust and other impurities attached to the bottom of the dustproof net 22, ensuring that the dustproof net 22 remains unobstructed. At the same time, the three sealing plates 28 inside the device can effectively play a role in heat preservation. At the same time, the sealing plates 28 on both sides cooperate with the air continuously ejected from the cooling chamber 19 and the preheating chamber 7 to effectively prevent dust from entering the interior of the equipment, so that there will be no dust attached to the mold after preheating, spraying and cooling.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mold preheating spraying unit, comprising a frame (1), characterized in that: A conveyor belt (2) is installed at the bottom of the frame (1), and ferrules (3) are fixedly connected to both sides of the outside of the conveyor belt (2), and a plurality of spacers (4) are fixedly connected to the middle of the conveyor belt (2). A spraying assembly is installed in the middle of the frame (1), and a preheating chamber (7) is fixedly connected to one side of the inside of the frame (1), and a heating wire (8) is fixedly connected to one side of the inside of the preheating chamber (7), and a plurality of elastic ropes (9) are fixedly connected to the other side of the inside of the preheating chamber (7), and a plurality of cleaning belts (10) are fixedly connected to the outside of the elastic ropes (9). ), a blower (11) is fixedly connected to one side of the top edge of the frame (1), an air inlet pipe (12) is connected between the output end of the blower (11) and the interior of the preheating chamber (7), an energy recovery component is installed on the other side of the top edge of the frame (1), a filter component is installed on the middle side of the top of the frame (1), a cooling chamber (19) is fixedly connected to the other side of the interior of the frame (1), a diffuser plate (20) is fixedly connected to the interior of the cooling chamber (19), and three sealing plates (28) are fixedly connected to the interior of the frame (1).

2. A mold preheating spraying unit according to claim 1, characterized in that: The spraying assembly comprises a multi-axis frame (5), both sides of which are mounted on the middle of the inner wall of the frame (1), and a spray head (6) is mounted on the bottom of the multi-axis frame (5).

3. A mold preheating spraying unit according to claim 1, characterized in that: The energy recovery component comprises a cooling jacket (13), a heat dissipation bin (16) and a delivery pump (18); the bottom of the cooling jacket (13) is fixedly connected to the top of the frame (1); a spiral tube (14) is fixedly connected inside the cooling jacket (13); the bottom end of the spiral tube (14) passes through the cooling jacket (13) and is fixedly connected to a recovery tube (15); the bottom end of the recovery tube (15) is connected to the inside of the preheating bin (7); the bottom of the heat dissipation bin (16) is fixedly connected to the top of the frame (1) on one side close to the blower (11); a plurality of heat dissipation fins (17) are fixedly connected to both sides of the outside of the heat dissipation bin (16); the inside of the heat dissipation bin (16) and the cooling jacket (13) are connected via a pipeline; the bottom of the delivery pump (18) is fixedly connected to the top of the frame (1); the input end of the delivery pump (18) and the inside of the heat dissipation bin (16) are connected via a pipeline; the output end of the delivery pump (18) and the inside of the cooling jacket (13) are connected via a pipeline.

4. A mold preheating spraying unit according to claim 3, characterized in that: The filter assembly comprises a filter bin (21) and a driving pulley (26); the bottom of the filter bin (21) is fixedly connected to a side of the top of the frame (1) away from the cooling jacket (13); the inside of the filter bin (21) is communicated with the spiral tube (14); the inner wall of the filter bin (21) is fixedly connected with a dust screen (22); the inside of the filter bin (21) is rotatably connected with a rotating shaft (23); the outer periphery of the rotating shaft (23) is fixedly connected with a cam (24); the front end of the rotating shaft (23) is fixedly connected with a driven pulley (25); the middle of the driving pulley (26) is installed on the outside of the conveyor belt (2); a belt is sleeved between the driven pulley (25) and the driving pulley (26); the inside of the filter bin (21) away from the spiral tube (14) and the cooling bin (19) are communicated through a pipeline.

5. A mold preheating spraying unit according to claim 3, characterized in that: The input end of the blower (11) is fixedly connected to an air inlet (27), and the air inlet (27) is located on a side of the heat dissipation fins (17) away from the heat dissipation bin (16).

6. A mold preheating spraying unit according to claim 1, characterized in that: The bottom of the sealing plate (28) is slidably connected to the spacer (4) and the top of the ring (3), wherein two of the sealing plates (28) are respectively located on both sides of the cooling bin (19), and the other sealing plate (28) is located on a side of the preheating bin (7) close to the cooling bin (19).

7. A mold preheating spraying unit according to claim 1, characterized in that: The bottom of the preheating chamber (7) is slidably connected to the top of the ring (3) and the spacer (4), and the bottom of the cooling chamber (19) is located above the spacer (4).

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