A cooling system dedicated to powder coating production line

Abstract

The present invention relates to the field of heat exchange cooling, and specifically is a cooling system dedicated to a powder coating production line. The structure includes a front cooling group and a rear cooling group. The front cooling group includes a pair of cooling rollers in contact with materials, and the rear cooling group cools the materials through a fan. The front cooling group also includes a guide seat. The working state of the fluid in the cooling roller includes a contact cooling state. The movement direction of the fluid in the contact cooling state is the same as the rotation direction of the cooling roller. The present invention also forms an immersion chamber between the cooling roller and the side extension of the guide seat. When the high-temperature material is contact-cooled, part of the temperature of the material is transferred to the cooling roller, and the guide seat generates a fluid in the same direction as the movement of the material. The heated cooling roller part contacts the downward fluid in the immersion chamber, thereby reducing the temperature of the cooling roller, and the heated fluid after heat exchange also flows downward and is discharged, so that the newly heated cooling roller above is in timely contact with the newly ejected fluid from the guide seat, thereby obtaining a better heat exchange cooling effect.

Description

Technical Field

[0001] The invention relates to the field of heat exchange cooling, in particular to a cooling system dedicated to a powder coating production line. Background Art

[0002] Thermoplastic powder coatings are made of thermoplastic resin, masterbatch and various additives, which are mixed and granulated by melt extrusion, and then finely crushed and graded.

[0003] During processing, after the raw materials are evenly mixed by a mixer, an extruder is usually used to melt, mix and extrude the raw materials. The extruded materials are cooled and then crushed and pulverized into the required powder. Different cooling forms are used according to the different extrusion forms. For example, when thin strips are extruded, a drawing and water immersion cooling method is usually used. For thick strips, extrusion into sheets with contact cooling and air cooling are usually used. During the contact cooling process, a water-cooled cooling roller is usually used to press and cool the material.

[0004] However, since the discharge direction of the fluid of the cooling roller is the axial direction of the cooling roller, but the moving direction of the material is the same as the rotation direction of the cooling roller, that is, perpendicular to the discharge direction of the fluid, when the cooling roller is extruding the material, the heated fluid in the cooling roller has no time to be discharged, and the low-temperature fluid has no time to completely pass in before it comes into contact with the newly extruded high-temperature material, resulting in uneven cooling effect on both sides and poor overall cooling effect. Summary of the invention

[0005] In view of the above problems, the present invention provides a cooling system dedicated to a powder coating production line, which structure includes a frame and a conveyor belt installed on the frame, and the cooling system also includes a front cooling group and a rear cooling group installed on the frame, the front cooling group includes a pair of cooling rollers rotating in opposite directions, the front cooling group as the entry end of the material contacts with the material through the cooling rollers for the first cooling and conveys the material to the conveyor belt, the rear cooling group includes a guide cover located on the conveyor belt and a fan installed on the guide cover, the conveyor belt drives the material to be transported to the next process and is cooled for the second time through the fan; the front cooling group also includes a guide seat installed in the cooling roller, the guide seat includes an inlet and outlet channel for the fluid, the inlet and outlet channel is connected to a diverter joint at the outer end of the cooling roller for supplying and discharging the fluid in the guide seat; the working state of the fluid of the cooling roller includes a supply and distribution state, a contact cooling state and a reflux state, the guide seat drives the fluid to enter the working state, the guide seat remains stationary in the cooling roller and the cooling roller rotates outside the guide seat, and the fluid movement direction in the contact cooling state is the same as the rotation direction of the cooling roller.

[0006] Furthermore, the guide seat includes a central axis portion, and a side extension portion is extended from the central axis portion toward the inner wall of the cooling roller. The front end of the side extension portion is in an arc shape. A gap is left between the inner wall of the cooling roller and the front end of the side extension portion, and the gap area is set as an immersion chamber; the working direction of the immersion chamber is set from top to bottom, and the immersion chamber is close to the middle area of ​​the two groups of cooling rollers, and this area is the area where the cooling roller squeezes and contacts the material; the inlet and outlet channels in the guide seat guide the fluid to flow from top to bottom in the immersion chamber, so that the fluid contacts the inner wall of the cooling roller to enter a contact cooling state to cool down the material in contact with the cooling roller.

[0007] Furthermore, the main body of the cooling roller is cylindrical and is provided with an opening on one side and a main side shaft head on the other side; a secondary side shaft head is installed at the opening of the cooling roller, and the cooling roller is movably mounted on the frame through the main side shaft head and the secondary side shaft head for rotation; the two sides of the immersion chamber are respectively against the side wall and the secondary side shaft head of the cooling roller, the middle axis portion passes through the secondary side shaft head and extends outward from the inside of the cooling roller to be connected to the diversion joint, and the guide seat is fixed in position with the outside through the middle axis portion.

[0008] Further, the inlet and outlet channels of the fluid in the flow guide seat include a first flow supply channel arranged in the middle axis portion along the axial direction of the middle axis portion, the side extension portion is provided with a plurality of front flow guide channels leading from the first flow supply channel to the front end of the side extension portion, the front flow guide channel forms a fluid nozzle at the front end of the side extension portion, and the fluid nozzle is located at the head end above the immersion chamber, and the first flow supply channel and the front flow guide channel guide the fluid into a supply distribution state; the inlet and outlet channels of the fluid in the flow guide seat include a first flow discharge channel arranged in the middle axis portion along the axial direction of the middle axis portion, the bottom end of the side extension portion is provided with a plurality of fluid discharge ports, and a front flow channel is provided in the side extension portion to be connected with the first flow discharge channel, the fluid discharge port is located at the end of the immersion chamber, and the front flow channel and the first flow discharge channel guide the fluid into a reflux state; the head end and the end end of the immersion chamber arranged from top to bottom are provided with end baffles on the side extension portion, and the end baffles are extended from the front end of the side extension portion toward the inner wall of the cooling roller, and the end baffles are clearance-matched with the inner wall of the cooling roller.

[0009] Furthermore, an upper concave cavity recessed above the lateral extension portion is provided at the bottom end of the immersion cavity, the fluid discharge port is arranged at the upper part of the upper concave portion, and the side wall on one side of the upper concave portion is formed by an end baffle.

[0010] Furthermore, an auxiliary cooling part is provided on the back of the guide seat, and the auxiliary cooling part includes a rear extension part arranged on the middle axis part and a rear guide frame detachably mounted on the middle axis part, and the rear guide frame is used to guide the fluid to contact the inner wall of the cooling roller; the inlet and outlet channels of the fluid in the guide seat include a second supply channel arranged in the middle axis part along the axial direction of the middle axis part, and the rear extension part is provided with a plurality of rear guide channels leading from the second supply channel to the front end of the rear extension part, and the rear guide channels form a fluid nozzle of the auxiliary cooling part at the front end of the rear extension part; the inlet and outlet channels of the fluid in the guide seat include a second discharge channel arranged in the middle axis part along the axial direction of the middle axis part, and a plurality of fluid discharge ports are provided at the bottom end of the middle axis part, and a rear discharge channel is provided in the middle axis part to be connected with the second discharge channel, and the fluid discharge port of the auxiliary cooling part is located on the outside of the end baffle.

[0011] Furthermore, the top end of the rear guide frame is inclined and guides the fluid of the rear extension portion to flow downward, and the side end of the rear guide frame is curved so that the fluid flows between the side end of the rear guide frame and the inner wall of the cooling roller and contacts the inner wall of the cooling roller.

[0012] Furthermore, the distance between the ends of the end baffles at both ends is smaller than the minimum inner diameter on the inner wall of the cooling roller, and the distance between the front end of the rear extension portion and the middle axis portion is smaller than the minimum inner diameter on the inner wall of the cooling roller.

[0013] Furthermore, a plurality of contact increasing rings are provided around the inner wall of the cooling roller to increase the contact area between the inner wall of the cooling roller and the fluid; the end of the end baffle is provided with a recessed groove to match the undulations of the contact increasing rings on the inner wall of the cooling roller, and the front end surface of the side extension is provided with a recessed groove to match the undulations of the contact increasing rings on the inner wall of the cooling roller.

[0014] Furthermore, one side of the guide seat is fixedly installed outside the cooling roller and the other side is rotatably fitted inside the cooling roller, the central axis of the guide seat extends a rotating shaft portion inside the cooling roller, and an inner shaft sleeve is nested on the rotating shaft portion; a shaft-mounted clearance groove is provided on the inner wall of the cooling roller close to the main side shaft head, the rotating shaft portion is nested in the shaft-mounted clearance groove through the inner shaft sleeve, and the inner shaft sleeve nested in the shaft-mounted clearance groove is locked and fixed by bolts; the length of the shaft-mounted clearance groove is greater than the sum of the diameter of the rotating shaft portion and the distance between the rear extension portion and the inner wall of the cooling roller.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention arranges a guide seat in the cooling roller and allows the cooling roller to rotate around the guide seat, and at the same time forms an immersion chamber between the cooling roller and the side extension of the guide seat. When the high-temperature material is contact-cooled, part of the temperature of the material is transferred to the cooling roller, and the guide seat generates a fluid from top to bottom in the same direction as the material movement direction. In the immersion chamber, the part of the cooling roller that is heated by contact with the high-temperature material is in contact with the downward fluid, thereby reducing the temperature of the cooling roller, and the heated fluid after heat exchange also flows downward and is discharged, so that the newly heated cooling roller above can promptly contact the lower-temperature fluid newly ejected from the guide seat, thereby obtaining a better heat exchange cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the overall structure of a cooling system dedicated to a powder coating production line of the present invention.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the front cooling group and the cooling box of the present invention.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the cooling roller and the guide seat of the present invention, as well as a schematic diagram of the partial cross-section structure of the cooling roller and the guide seat.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the flow guide seat of the present invention and a schematic diagram of the partial cross-section structure of the bottom of the immersion chamber cooperating with the cooling roller.

[0021] Figure 5 It is a schematic diagram of the side section structure of the cooling roller and the guide seat of the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the flow guide seat and the cooling roller for rotational cooperation in the present invention.

[0023] Figure 7 It is a side structural schematic diagram of the inner shaft sleeve on the central shaft portion of the present invention cooperating with the shaft mounting clearance groove.

[0024] In the figure: 1. Frame; 2. Conveyor belt; 3. Front cooling group; 4. Rear cooling group; 5. Cooling box;

[0025] 31. cooling roller; 32. secondary side shaft head; 33. flow guide seat; 34. flow diversion joint; 35. rear flow guide frame; 51. box body; 52. spiral immersion pipe;

[0026] 311, main side shaft head; 31a, immersion chamber; 31b, contact ring; 31c, shaft mounting clearance groove; 331, middle shaft; 332, side extension; 333, end baffle; 334, rear extension; 335, inner shaft sleeve; 35a, seepage drainage groove;

[0027] 331a, first flow supply channel; 331b, first flow discharge channel; 331c, second flow supply channel; 331d, second flow discharge channel; 332a, front flow channel; 332b, fluid nozzle; 332c, upper concave cavity; 332d, front flow channel; 332e, fluid discharge port; 332f, rear flow channel; 334a, rear flow channel. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Examples, such as Figure 1-Figure 7 As shown: The present invention provides a cooling system dedicated to a powder coating production line, which structure includes a frame 1 and a conveyor belt 2 installed on the frame 1, and a front cooling group 3 and a rear cooling group 4 installed on the frame 1. The frame 1 is arranged at the front end of an extruder, and the mixed molten material is extruded by the extruder. The conveyor belt 2 is used to drive the material through the main cooling area of ​​the cooling system to cool the material. It can be seen that the conveyor belt 2 adopts a chain-type conveyor belt 2, and the material is usually stainless steel to reduce the adhesion between the melted thermoplastic material and the conveyor belt 2;

[0030] Among them, the front cooling group 3 includes a pair of cooling rollers 31 rotating in opposite directions. The front cooling group 3 serves as the entry end of the material. It contacts the molten material through the cooling rollers 31. The temperature of the molten material is transmitted to the fluid in the cooling rollers 31, allowing the fluid to take away some heat to perform the first cooling of the material. At the same time, the cooling rollers 31 on both sides extrude and stretch the material into a sheet and transport the material to the conveyor belt 2. The rear cooling group 4 includes a guide hood located on the conveyor belt 2 and a fan installed on the guide hood. The conveyor belt 2 drives the material to the next process and performs the second cooling through the fan.

[0031] In this embodiment, the main body of the cooling roller 31 is cylindrical and is provided with an opening on one side and a main side shaft head 311 on the other side. A secondary side shaft head 32 is installed at the opening of the cooling roller 31. The cooling roller 31 is movably installed on the frame 1 through the main side shaft head 311 and the secondary side shaft head 32 for rotation, and the front cooling group 3 also includes a guide seat 33 installed in the cooling roller 31. The guide seat 33 remains stationary in the cooling roller 31 while the cooling roller 31 rotates outside the guide seat 33. The guide seat 33 includes an inlet and outlet channel for the fluid. The inlet and outlet channel is connected to a diverter joint 34 at the outer end of the cooling roller 31 for supplying and discharging the fluid in the guide seat 33. The movement direction of the fluid for contacting the main body of the cooling roller 31 for cooling is the same as the rotation direction of the cooling roller 31, that is, the same as or tangent to the descending direction of the material.

[0032] In addition, the working state of the fluid of the cooling roller 31 includes a supply distribution state, a contact cooling state and a reflux state. The guide seat 33 is used to drive the fluid into the working state, wherein the guide seat 33 includes a central axis portion 331, the central axis portion 331 passes through the secondary side shaft head 32 and extends outward from the inside of the cooling roller 31 to be connected with the diversion joint 34, the guide seat 33 is fixed with the outside through the central axis portion 331, and a side extension portion 332 is extended from the central axis portion 331 to the inner wall of the cooling roller 31, and the front end of the side extension portion 332 is in an arc shape, and a gap is left between the inner wall of the cooling roller 31 and the front end of the side extension portion 332, and the gap area is set as an immersion chamber 31a, and the inlet and outlet channels in the guide seat 33 guide the fluid to flow from top to bottom in the immersion chamber 31a, so that the fluid contacts the inner wall of the cooling roller 31 to enter the contact cooling state to cool down the material in contact with the cooling roller 31;

[0033] Specifically, in the supply and distribution state, the inlet and outlet channels of the fluid in the flow guide seat 33 include a first flow supply channel 331a arranged axially along the middle axis 331 in the middle axis 331, and the side extension 332 is provided with a plurality of front flow guide channels 332a extending from the first flow supply channel 331a to the front end of the side extension 332, and the front flow guide channel 332a forms a fluid nozzle 332b at the front end of the side extension 332, and the fluid nozzle 332b is located at the head end above the immersion chamber 31a, and the flow diversion joint 34 is connected to the high-pressure fluid, and the first flow supply channel 331a and the front flow guide channel 332a guide the fluid into the supply and distribution state;

[0034] In the contact cooling state, the working direction of the immersion chamber 31a is set from top to bottom, and the two sides of the immersion chamber 31a are respectively against the side walls of the cooling roller 31 and the auxiliary side shaft head 32. The immersion chamber 31a is located close to the middle area of ​​the two groups of cooling rollers 31, and this area is the area where the cooling rollers 31 squeeze and contact the material. The head end and the tail end of the immersion chamber 31a set from top to bottom are provided with end baffles 333 on the side extension part 332. The end baffles 333 extend from the front end of the side extension part 332 toward the inner wall of the cooling roller 31. The plate 333 is fitted with the inner wall of the cooling roller 31 in a clearance, so that the area restricting the movement of the fluid is surrounded by the part of the cooling roller 31 that contacts the material, so that the fluid is ejected from the fluid nozzle 332b and moves downward to the bottom of the immersion chamber 31a. At the same time, the cooling roller 31 also rotates downward, so that the part that is heated by contacting with the high-temperature material contacts the downward fluid, and the heated fluid after heat exchange also flows downward, so that the newly heated cooling roller 31 above can contact the newly ejected fluid from the fluid nozzle 332b in time, thereby obtaining a better heat exchange and cooling effect;

[0035] For the reflux state; the inlet and outlet channels of the fluid in the flow guide seat 33 include a first discharge channel 331b arranged axially along the middle axis 331 in the middle axis 331, a plurality of fluid discharge ports 332e are provided at the bottom end of the side extension portion 332, and a front row flow channel 332d connected to the first discharge channel 331b is provided in the side extension portion 332, the fluid discharge port 332e is located at the end of the immersion chamber 31a, the front row flow channel 332d and the first discharge channel 331b guide the fluid into the reflux state, and in practice the diversion joint 34 is connected to an external negative pressure device, and the heated fluid at the bottom of the immersion chamber 31a is extracted in the form of negative pressure suction.

[0036] Moreover, in the present embodiment, an upper concave cavity 332c which is recessed upwardly toward the side extension portion 332 is provided at the bottom end of the immersion cavity 31a, a fluid discharge port 332e is provided at the upper portion of the upper concave portion, and a side wall on one side of the upper concave portion is formed by an end baffle plate 333, so that a part of the fluid is accumulated in the upper concave cavity 332c for suction and discharge.

[0037] As for the situation where the fluid seeps out from the gap between the end baffle 333 on the side of the upper concave cavity 332c and the inner wall of the cooling roller 31, in the present embodiment, an auxiliary cooling part is provided on the back of the guide seat 33, and the auxiliary cooling part produces a fluid in the opposite direction to the fluid in the immersion chamber 31a, so as to further cool the cooling roller 31, and the auxiliary cooling part includes a rear extension part 334 provided on the middle axis part 331 and a rear guide frame 35 detachably mounted on the middle axis part 331, and the rear guide frame 35 is used to guide the fluid to contact with the inner wall of the cooling roller 31; firstly, the inlet and outlet channels of the fluid in the guide seat 33 include a second flow supply channel 331c arranged in the middle axis part 331 along the axial direction of the middle axis part 331, and the rear extension part 334 is provided with a plurality of rear guide channels 334a leading from the second flow supply channel 331c to the front end of the rear extension part 334, and the rear guide channels 334a form the auxiliary cooling part at the front end of the rear extension part 334 The fluid nozzle 332b sprays the fluid from the rear extension portion 334; then, the top end of the rear guide frame 35 is inclined and guides the fluid of the rear extension portion 334 to flow downward, and the side end of the rear guide frame 35 is curved so that the fluid flows between the side end of the rear guide frame 35 and the inner wall of the cooling roller 31 and contacts the inner wall of the cooling roller 31, and the sprayed fluid contacts the inner wall of the cooling roller 31 through the rear guide frame 35, so as to further cool the cooling roller 31; finally, the inlet and outlet channels of the fluid in the guide seat 33 include a second discharge channel 331d arranged in the middle axis portion 331 along the axial direction of the middle axis portion 331, a plurality of fluid discharge ports 332e are provided at the bottom end of the middle axis portion 331, and a rear discharge channel 332f is provided in the middle axis portion 331 and connected to the second discharge channel 331d, and the fluid discharge port 332e of the auxiliary cooling part is located on the outside of the end baffle 333 to suck the fluid flowing to the bottom.

[0038] It is known that those skilled in the art can control the pressure of pressurized supply and negative pressure suction according to actual needs, so as to achieve a better balance of the fluid in the immersion chamber 31a.

[0039] It should be noted that a seepage drainage groove 35a is provided at the bottom end of the rear guide frame 35 to provide a place for the fluid seeping out from the gap between the side end of the rear guide frame 35 and the side surface of the cooling roller 31 and the inner wall of the secondary side shaft head 32 to be discharged.

[0040] Moreover, in the present embodiment, a plurality of contact increasing rings 31b are arranged around the inner wall of the cooling roller 31, so as to increase the contact area between the inner wall of the cooling roller 31 and the fluid; the end of the end baffle 333 is provided with a recessed groove to match the ups and downs of the contact increasing ring 31b on the inner wall of the cooling roller 31, so as to make a clearance fit with the contact increasing ring 31b, and the front end surface of the side extension portion 332 is provided with a recessed groove to match the ups and downs of the contact increasing ring 31b on the inner wall of the cooling roller 31, so as to make the size of the immersion cavity 31a more uniform.

[0041] It should be noted that the distance between the ends of the end baffles 333 at both ends is smaller than the minimum inner diameter on the inner wall of the cooling roller 31, and the distance between the front end of the rear extension portion 334 and the middle axis portion 331 is smaller than the minimum inner diameter on the inner wall of the cooling roller 31. Therefore, on the basis of the contact-increasing ring 31b being provided on the inner wall of the cooling roller 31, the guide seat 33 can be installed in the cooling roller 31, and the end baffle 333 can achieve a clearance fit with the contact-increasing ring 31b.

[0042] In the specific implementation, the guide seat 33 is nested and installed in the cooling roller 31, one side of the guide seat 33 is fixedly installed outside the cooling roller 31 and the other side is rotatably matched in the cooling roller 31, the middle shaft portion 331 of the guide seat 33 extends a shaft portion in the cooling roller 31, and an inner shaft sleeve 335 is nested on the shaft portion, and a shaft-mounted clearance groove 31c is provided on the inner wall of the cooling roller 31 close to the main side shaft head 311, and the shaft portion is nested in the shaft-mounted clearance groove 31c through the inner shaft sleeve 335, and the inner shaft sleeve 335 nested in the shaft-mounted clearance groove 31c is locked and fixed by bolts on the outside of the cooling roller 31. In this way, the guide seat 33 and the cooling roller 31 can rotate coaxially. It should be noted that the length of the shaft-mounted clearance groove 31c is greater than the sum of the diameter of the rotating shaft part and the distance between the rear extension part 334 and the inner wall of the cooling roller 31. Therefore, the guide seat 33 can be first extended sideways into the cooling roller 31 and first enter the shaft-mounted clearance groove 31c. After sliding to the required position in the shaft-mounted clearance groove 31c, the guide seat 33 is matched with the inner wall of the cooling roller 31. Then, the secondary side shaft head 32 is installed at the opening of the cooling roller 31, and the cooling roller 31 is rotated on the frame 1 through the main side shaft head 311 and the secondary side shaft head 32.

[0043] After the guide seat 33 is fixed in position, the diverter joint 34 is connected to the guide seat 33. The fluid can be pure water. The fluid is pressurized from an external water supply device to drive the fluid to enter from the diverter joint 34, and then pass through the first flow supply channel 331a and the front guide channel 332a, and then spray out from the fluid nozzle 332b into the immersion chamber 31a. The molten material is squeezed out from the extruder port and falls between the cooling rollers 31. The cooling rollers 31 rotate and drive the material to be squeezed downward into sheets. At the same time, the fluid is sprayed out from the fluid nozzle 332b and moves to the bottom of the immersion chamber 31a, and the cooling The roller 31 also rotates downward, and the heated portion that contacts the high-temperature material contacts the downward fluid, and the heated fluid after heat exchange also flows downward, so that the newly heated cooling roller 31 above can timely contact the newly ejected fluid from the fluid nozzle 332b, thereby obtaining a better heat exchange cooling effect, and the cooling roller 31 after the initial cooling continues to rotate, and the auxiliary cooling part injects a part of the fluid to assist in cooling the cooling roller 31, so that the temperature of the heated cooling roller 31 portion drops even lower, so as to better cope with the next contact with the high-temperature material;

[0044] The material cooled by the front cooling group 3 and extruded into sheets is transported to the rear cooling group 4 via the conveyor belt 2, and is sent out after being cooled by the fan. The refluxed fluid can be further cooled by heat exchange through the cooling box 5. The cooling box 5 includes a box body 51 and a spiral immersion pipe 52. The heated fluid after being extracted enters the spiral immersion pipe 52 and contacts with the low-temperature water or oil in the cooling box 5, thereby reducing the temperature for next use.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A cooling system dedicated to a powder coating production line, comprising a frame and a conveyor belt mounted on the frame, characterized in that: The cooling system also includes a front cooling group and a rear cooling group installed on the frame. The front cooling group includes a pair of cooling rollers rotating in opposite directions. The front cooling group, as the entry end of the material, contacts the material through the cooling rollers for the first cooling and conveys the material to the conveyor belt. The rear cooling group includes a guide cover located on the conveyor belt and a fan installed on the guide cover. The conveyor belt drives the material to be transported to the next process and the fan is used for the second cooling. The front cooling group also includes a flow guide seat installed in the cooling roller, the flow guide seat includes an inlet and outlet channel for the fluid, and the inlet and outlet channel is connected to a diverter joint at the outer end of the cooling roller for supplying and discharging the fluid in the flow guide seat; The working state of the fluid of the cooling roller includes a supply distribution state, a contact cooling state and a reflux state. The guide seat drives the fluid to enter the working state. The guide seat remains stationary inside the cooling roller while the cooling roller rotates outside the guide seat. The movement direction of the fluid in the contact cooling state is the same as the rotation direction of the cooling roller. The guide seat comprises a central axis portion, a side extension portion is extended from the central axis portion toward the inner wall of the cooling roller, the front end of the side extension portion is in an arc shape, a gap is left between the inner wall of the cooling roller and the front end of the side extension portion, and the gap area is set as an immersion chamber; the working direction of the immersion chamber is set from top to bottom, the immersion chamber is close to the middle area of ​​the two groups of cooling rollers, and the area is the area where the cooling roller squeezes and contacts the material; the inlet and outlet channels in the guide seat guide the fluid to flow from top to bottom in the immersion chamber, so that the fluid contacts the inner wall of the cooling roller to enter a contact cooling state to cool down the material in contact with the cooling roller; The inlet and outlet channels of the fluid in the flow guide seat include a first flow supply channel arranged in the middle axis portion along the axial direction of the middle axis portion, the side extension portion is provided with a plurality of front flow guide channels leading from the first flow supply channel to the front end of the side extension portion, the front flow guide channel forms a fluid nozzle at the front end of the side extension portion, and the fluid nozzle is located at the head end above the immersion chamber, and the first flow supply channel and the front flow guide channel guide the fluid into a supply distribution state; the inlet and outlet channels of the fluid in the flow guide seat include a first flow discharge channel arranged in the middle axis portion along the axial direction of the middle axis portion, the bottom end of the side extension portion is provided with a plurality of fluid discharge ports, and a front flow channel is provided in the side extension portion to be connected with the first flow discharge channel, the fluid discharge port is located at the end of the immersion chamber, and the front flow channel and the first flow discharge channel guide the fluid into a reflux state; the head end and the end end of the immersion chamber arranged from top to bottom are provided with end baffles on the side extension portion, and the end baffles are extended from the front end of the side extension portion to the inner wall of the cooling roller, and the end baffles are clearance-matched with the inner wall of the cooling roller.

2. A cooling system for a powder coating production line according to claim 1, characterized in that: The main body of the cooling roller is cylindrical and has an opening on one side and a main side shaft head on the other side. The opening of the cooling roller is provided with a secondary side shaft head. The cooling roller is movably mounted on the frame through the main side shaft head and the secondary side shaft head to rotate. The two sides of the immersion chamber are respectively against the side wall of the cooling roller and the secondary side shaft head, the middle axis part passes through the secondary side shaft head and extends outward from the inside of the cooling roller to connect with the diversion joint, and the guide seat is fixed in position with the outside through the middle axis part.

3. A cooling system dedicated to a powder coating production line according to claim 1, characterized in that: An upper concave cavity which is recessed above the lateral extension is provided at the bottom of the immersion cavity, the fluid outlet is arranged at the upper part of the upper concave portion, and the side wall on one side of the upper concave portion is formed by an end baffle.

4. The cooling system for a powder coating production line according to claim 1, characterized in that: The back of the guide seat is provided with an auxiliary cooling part, and the auxiliary cooling part includes a rear extension part provided on the middle shaft part and a rear guide frame detachably installed on the middle shaft part, and the rear guide frame is used to guide the fluid to contact with the inner wall of the cooling roller; The inlet and outlet channels of the fluid in the guide seat include a second flow supply channel arranged in the middle axis portion along the axial direction of the middle axis portion, and the rear extension portion is provided with a plurality of rear guide channels leading from the second flow supply channel to the front end of the rear extension portion, and the rear guide channels form a fluid nozzle of the auxiliary cooling part at the front end of the rear extension portion; The inlet and outlet channels of the fluid in the guide seat include a second drainage channel in the middle axis portion which is axially arranged along the middle axis portion. A plurality of fluid discharge ports are provided at the bottom end of the middle axis portion, and a rear discharge channel is provided in the middle axis portion which is connected to the second drainage channel. The fluid discharge port of the auxiliary cooling part is located on the outside of the end baffle.

5. A cooling system for a powder coating production line according to claim 4, characterized in that: The top end of the rear guide frame is inclined and guides the fluid of the rear extension portion to flow downward, and the side end of the rear guide frame is curved so that the fluid flows between the side end of the rear guide frame and the inner wall of the cooling roller and contacts the inner wall of the cooling roller.

6. A cooling system for a powder coating production line according to claim 4, characterized in that: The distance between the ends of the end baffles at both ends is smaller than the minimum inner diameter on the inner wall of the cooling roller, and the distance between the front end of the rear extension part and the middle axis part is smaller than the minimum inner diameter on the inner wall of the cooling roller.

7. A cooling system for a powder coating production line according to claim 6, characterized in that: A plurality of contact increasing rings are arranged around the inner wall of the cooling roller to increase the contact area between the inner wall of the cooling roller and the fluid; The end of the end baffle is provided with a concave groove to match the undulation of the contact ring on the inner wall of the cooling roller, and the front end surface of the side extension is provided with a concave groove to match the undulation of the contact ring on the inner wall of the cooling roller.

8. The cooling system for a powder coating production line according to claim 6, characterized in that: One side of the guide seat is fixedly installed outside the cooling roller and the other side is rotatably matched inside the cooling roller. The middle axis of the guide seat extends a section of the rotating shaft inside the cooling roller, and an inner sleeve is embedded on the rotating shaft. The inner wall of the cooling roller close to the main side shaft head is provided with a shaft mounting clearance groove, the rotating shaft part is nested in the shaft mounting clearance groove through an inner shaft sleeve, and the inner shaft sleeve nested in the shaft mounting clearance groove is locked and fixed by bolts; The length of the shaft-mounted clearance groove is greater than the sum of the diameter of the rotating shaft portion and the distance between the rear extension portion and the inner wall of the cooling roller.

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