Hot-air circulating oven and method of operation thereof

Abstract

The application discloses a hot air circulating oven and a working method thereof. The oven comprises a box body, at least one fan and at least one group of heat generators. The box body has an inlet end and an outlet end. The box body forms an installation cavity between the inlet end and the outlet end, and also forms a group of air outlets communicating with the installation cavity between the inlet end and the outlet end. The box body further forms a return air passage separated from the installation cavity and at least one return air hole communicating with the return air passage. The box body of the oven forms at least one return air hole at both ends in the longitudinal direction perpendicular to the transverse direction. The fan is arranged in the installation cavity of the box body close to the inlet end, and the air inlet of the fan communicates with the return air passage. The heat generator is also arranged in the installation cavity and located on the flow path of the flowing air formed by the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical equipment for printing, and in particular to a hot air recyclable oven and a working method thereof. BACKGROUND

[0002] At present, printing equipment is used to print on paper, cloth and other thin carriers to form various beautiful patterns or pictures, wherein the printing method is divided into spraying and printing. The ink needs to be sprayed on the thin carrier according to the preset track.

[0003] In order to prevent the mark on the thin carrier from being touched by other objects before the ink is dried, a drying process is usually added after the thin carrier is sprayed. The commonly used drying device is an oven. The existing oven can indeed dry the ink on the thin carrier to a certain extent. However, the existing oven also has many defects.

[0004] Firstly, when drying the thin carrier, the existing oven usually directs the hot air formed by the heating pipe to the side of the thin carrier on which the ink is sprayed by a fan. Therefore, the existing oven usually sets a fan at one end of the oven through which the thin carrier enters. While the fan directs the hot air to the thin carrier, the hot air will overflow along the outlet of the paper. In this way, it is inevitable that a large amount of heat will be lost. In order to fully utilize the hot air, sometimes a fan is set at the end of the oven through which the thin carrier exits, which blows air towards the end of the oven through which the thin carrier enters, so that the hot air can be recycled. However, this way, since two fans are needed, not only the cost of the oven is increased, but also the size and weight of the oven are too large.

[0005] More importantly, the two fans blow air towards each other, which will inevitably cause the thin carrier between the two fans to shake violently. In this way, it will cause the ink on the thin carrier which has not been dried to move seriously, thereby affecting the quality and qualification rate of the final product. SUMMARY

[0006] An advantage of the present application is to provide a hot air recyclable oven and a working method thereof, wherein the hot air recyclable oven can realize the recycling of hot air without setting two fans blowing air towards each other.

[0007] Another advantage of the present application is to provide a hot air recyclable oven and a working method thereof, wherein the hot air recyclable oven can reduce the energy consumption of the hot air recyclable oven.

[0008] Another advantage of the present application is to provide a hot air recyclable oven and a working method thereof, wherein the hot air recyclable oven can prevent the thin carrier from shaking violently.

[0009] Another advantage of the present application is to provide a hot air circulating oven and a method for operating the same, wherein the hot air circulating oven has a relatively small modification to the existing oven structure, thereby reducing the cost of the modification.

[0010] Another advantage of the present application is to provide a hot air circulating oven and a method for operating the same, wherein the hot air circulating oven is capable of preventing air pressure turbulence caused by a single fan, thereby effectively reducing the degree of shaking of the thin carrier when passing through the oven.

[0011] Another advantage of the present application is to provide a hot air circulating oven and a method for operating the same, wherein the hot air circulating oven is capable of achieving hot air circulation with only one fan, thereby achieving heat recycling while relatively reducing the volume and weight of the oven.

[0012] Another advantage of the present application is to provide a hot air circulating oven and a method for operating the same, wherein the hot air circulating oven is capable of reducing the degree of creasing of the thin carrier when being heated and dried, especially the degree of creasing of paper when being heated.

[0013] To achieve at least one of the above advantages of the present application, a hot air circulating oven is provided, comprising:

[0014] a housing, wherein the housing has an inlet end and an outlet end; the housing forms an installation cavity between the inlet end and the outlet end, and the housing also forms a group of air outlets communicating with the installation cavity between the inlet end and the outlet end, wherein the housing further forms a return air passage separated from the installation cavity and at least one return air hole communicating with the return air passage;

[0015] at least one fan, which is arranged in the installation cavity of the housing near the inlet end, and the return air passage is communicated with the air inlet of the fan near the inlet end; and

[0016] at least one group of heat generators, which are also arranged in the installation cavity and located on the flow path of the flowing air formed by the fan. According to an embodiment of the present application, the aperture of the return air hole gradually decreases from the outlet end to the inlet end.

[0017] According to an embodiment of the present application, the spacing between adjacent two return air holes gradually decreases from the outlet end to the inlet end.

[0018] According to an embodiment of the present application, the cabinet has a cabinet body and an air outlet plate, wherein the cabinet body forms the installation cavity, the air outlet plate forms the air outlet, and the air outlet plate covers the installation cavity. The cabinet further comprises at least one partition plate, wherein the partition plate is arranged in the installation cavity to divide the installation cavity into a first installation cavity and a second installation cavity, and a communication passage is formed between the partition plate and the air outlet plate to enable the first installation cavity and the second installation cavity to communicate through the communication passage.

[0019] According to an embodiment of the present application, the communication passage is arranged on both sides of the longitudinal direction, so that the hot air flowing back from the air return hole can be more guided by the fan to the second installation cavity through the communication passage.

[0020] According to an embodiment of the present application, the cabinet further comprises an air return plate, wherein the air return plate is arranged at the discharge end, and the air return plate is arranged to be inclined towards the feeding end with the top higher than the air return hole, and the air return plate is arranged to extend along the longitudinal direction.

[0021] According to an embodiment of the present application, the cabinet further comprises a cover plate, wherein both sides of the cover plate are mounted on both sides of the cabinet in the longitudinal direction, and a material body passage is formed between the cover plate and the air outlet plate for the thin carrier to pass through.

[0022] According to an embodiment of the present application, a transverse direction is defined from the feeding end to the discharge end, and the hot air circulating oven comprises a plurality of the heat generators, wherein the plurality of the heat generators are arranged at intervals along the transverse direction.

[0023] According to an embodiment of the present application, the plurality of the heat generators are arranged at equal intervals along the transverse direction.

[0024] To achieve at least one of the above advantages, the present application provides a working method performed by a hot air circulating oven, the method comprising the steps of:

[0025] heating the air flow in the installation cavity by a group of heat generators;

[0026] guiding the air flow out of the air outlet by a fan, and guiding the air flow flowing out of the air outlet to flow back through the air return hole in communication with the installation cavity. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A perspective view of the hot air circulating oven of the present application is shown.

[0028] Figure 2 An exploded view of the hot air circulating oven of the present application is shown.

[0029] Figure 3 A top view of the hot air circulating oven according to the present application is shown.

[0030] Figure 4 A top view of the hot air circulating oven according to the present application is shown. Figure 3 A sectional view of the hot air circulating oven according to the present application in A-A direction is shown.

[0031] Figure 5 A schematic view of the hot air circulating oven according to the present application in one working state is shown.

[0032] Figure 6 A top view of the hot air circulating oven according to the present application is shown.

[0033] Figure 7 A sectional view of the hot air circulating oven according to the present application in B-B direction is shown. Figure 6

[0034] A sectional view of the cover plate of the hot air circulating oven according to the present application in one preferred embodiment is shown. Figure 8

[0035] A bottom view of the cover plate of the hot air circulating oven according to the present application in one preferred embodiment is shown. Figure 9 Figure 6 DETAILED DESCRIPTION

[0036] The following description is presented to enable any person skilled in the art to practice the present application as claimed. The preferred embodiments disclosed herein are only examples of the present application and alternative embodiments can be devised by those skilled in the art without departing from the spirit and scope of the present application. The present application is defined by the appended claims.

[0037] Those skilled in the art will understand that, in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms cannot be understood as limiting the present application.

[0038] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.​​

[0039] Reference Figures 1 to 9 A hot air recyclable oven according to a preferred embodiment of the present application will be described in detail below, which is capable of drying thin carriers 900 and capable of recycling hot air. It is understood by those skilled in the art that the thin carriers 900 can be paper, canvas, etc., and the present application is not limited in this respect.

[0040] Specifically, the hot air recyclable oven comprises a cabinet 10, wherein the cabinet 10 has an inlet end 101 and an outlet end 102, wherein the thin carriers 900 can move from the inlet end 101 towards the outlet end 102.

[0041] The cabinet 10 forms a mounting cavity 103 between the inlet end 101 and the outlet end 102, and the cabinet 10 further forms a set of air outlets 104 in communication with the mounting cavity 103 on top of the mounting cavity 103 between the inlet end 101 and the outlet end 102.

[0042] Preferably, the air outlets 104 are arranged obliquely towards the outlet end 102 to avoid the air directed from the air outlets 104 blowing vertically to the thin carriers 900 and causing the thin carriers 900 to be subjected to excessive pressure.

[0043] Preferably, a transverse direction is defined from the inlet end 101 to the outlet end 102, wherein each of the air outlets 104 is arranged to extend along a longitudinal direction perpendicular to the transverse direction, so that the hot air recyclable oven can form hot air capable of covering the entire longitudinal width of the thin carriers 900. That is, the air outlets 104 are elongated openings extending along the longitudinal direction.

[0044] Also preferably, the cabinet 10 forms a plurality of the air outlets 104, wherein the plurality of the air outlets 104 are arranged at intervals along the transverse direction to increase the area of the thin carriers 900 capable of being dried by the hot air recyclable oven. More preferably, the plurality of the air outlets 104 are arranged at equal intervals along the transverse direction.

[0045] Specifically, the cabinet 10 has a cabinet body 11 and an air outlet plate 12, wherein the top of the cabinet body 11 forms the mounting cavity 103 at a corresponding position, wherein the air outlet plate 12 covers the top of the mounting cavity 103 and forms the air outlets 104.

[0046] The hot air circulating oven comprises at least one set of heat generators 20 and at least one air blower 30. The air blower 30 is arranged in the installation cavity 103 of the box body 10 near the feeding end 101. The heat generators 20 are also arranged in the installation cavity 103 and located on the flow path of the flowing air formed by the air blower 30.

[0047] The air blower 30 is arranged to guide the air from the feeding end 101 to the discharging end 102. During the process of guiding the air from the feeding end 101 to the discharging end 102 by the air blower 30, the air is heated by the heat generators 20 and the hot air can be guided out through the air outlet 104. The hot air formed after being heated by the heat generators 20 can flow out from the air outlet 104 to dry the ink on the thin carrier 900 opposite to the air outlet 104. Preferably, the air blower 30 is arranged near the feeding end 101.

[0048] As a preferred embodiment, the hot air circulating oven comprises a plurality of heat generators 20, wherein the plurality of heat generators 20 are arranged at intervals along the transverse direction, preferably at equal intervals. In this way, the thin carrier 900 opposite to the air outlet 104 can be uniformly dried.

[0049] It is worth mentioning that the box body 10 of the hot air circulating oven, preferably at least one of the two sides in the longitudinal direction of the installation cavity 103, forms at least one return air passage 105 separated from the installation cavity 103 and a set of return air holes 106 communicating with the return air passage 105, wherein the return air holes 106 are arranged at the top of the return air passage 105 and a set of return air holes 106 are arranged at intervals along the transverse direction. At the same time, the return air passage 105 is communicated with the air inlet of the air blower 30 near the feeding end 101.

[0050] As a preferred embodiment, the box body 10 of the hot air circulating oven forms at least one return air passage 105 separated from the installation cavity 103 and a set of return air holes 106 communicating with the return air passage 105 on each of the two sides in the longitudinal direction of the installation cavity 103. In this way, after the hot air is guided out from the air outlet 104, the used hot air can flow back to the return air passage 105 from the return air holes 106 on both sides of the thin carrier 900 under the action of negative pressure formed by the air blower 30 near the feeding end 101 and constantly flow to the air inlet of the air blower 30.

[0051] In this way, the hot air can be effectively recycled and utilized.

[0052] Preferably, the box 10 further comprises at least one partition 13, wherein the partition 13 is arranged in the installation cavity 103 to divide the installation cavity 103 into a first installation cavity 1031 and a second installation cavity 1032, and a communication passage 108 is formed between the partition 13 and the air outlet plate 12 to enable the first installation cavity 1031 and the second installation cavity 1032 to communicate through the communication passage 108.

[0053] The fan 30 is installed in the first installation cavity 1031. In a preferred embodiment, a plurality of the heat generators 20 are arranged in the second installation cavity 1032 at intervals. Preferably, the communication passage 108 is arranged on both sides of the longitudinal direction, so that the hot air flowing back from the air return hole 106 can be more effectively guided to the second installation cavity 1032 by the fan 30 through the communication passage 108.

[0054] As can be understood by those skilled in the art, through such an arrangement, the hot air recyclable oven can achieve the recycling of hot air without the need for two fans blowing air in opposite directions.

[0055] Further preferably, the box 10 further comprises an air return plate 14, wherein the air return plate 14 is arranged at the discharge end 102, and the air return plate 14 is arranged to extend upwardly and tilt towards the feeding end 101. At the same time, the box 10, i.e. the air outlet plate 12, is formed between the air return plate 14 and the feeding end 101, and close to the position of the air return plate 14 to form an air return opening 109.

[0056] Preferably, the air return opening 109 and the air return plate 14 are arranged to extend along the longitudinal direction. In this way, when the hot air is guided by the fan 30 from the air outlet opening 104 to flow to the discharge end 102, a part of the hot air will flow back to the installation cavity 103 from the air return opening 109 due to the blocking of the air return plate 14. In a preferred embodiment, the air return passage 105 communicates with the installation cavity 103 close to the discharge end 102, and the air return opening 109 communicates with the air return passage 105. In this way, the hot air flowing back from the air return opening 109 can also flow to the air inlet of the fan 30 through the air return passage 105.

[0057] As preferred, in one embodiment, the diameter of the return air hole 106 gradually decreases from the discharge end 102 to the feeding end 101. In this way, when the fan 30 is working, the hot air from the air outlet 104 near the fan 30 can be reduced to be excessively returned from the return air hole 106. In this way, not only can the thin carrier 900 near the fan 30 be sufficiently dried by the hot air, but also the hot air can be circulated and returned.

[0058] In another embodiment, the distance between two adjacent return air holes 106 gradually decreases from the discharge end 102 to the feeding end 101. In this way, when the fan 30 is working, the return air hole 106 near the fan 30 can be reduced to be interfered.

[0059] Further preferably, the box 10 further comprises a cover plate 15, wherein two sides of the cover plate 15 are mounted on the two longitudinal sides of the box 10 and form a material body passage 109 with the air outlet plate 12 for the thin carrier 900 to pass through.

[0060] The cover plate 15 is covered on the air outlet 104 formed by the box 10, so as to avoid the loss of hot air. Those skilled in the art can understand that, since the cover plate 15 and the return air plate 14 are respectively arranged around the air outlet 104, at the same time, the fan 30 continuously guides the hot air to flow from the feeding end 101 to the discharge end 102, and then returns through the return air hole 106. In this way, the hot air can be fully utilized to dry the thin carrier 900.

[0061] More preferably, one side of the cover plate 15 towards the air outlet 104 forms an arc surface 1501, which is used to abut the side of the thin carrier 900 on which the ink is sprayed. In addition, the arc surface 1501 is provided with an anti-wrinkle structure 40.

[0062] In one embodiment, the anti-wrinkle structure 40 comprises at least one pair of convex ribs 41, wherein the pair of convex ribs 41 are symmetrically arranged along the transverse direction on the arc surface 1501, and the distance between the two convex ribs 41 near the feeding end 101 is smaller than the distance between the two convex ribs 41 near the discharge end 102.

[0063] By such an arrangement, while the thin carrier 900 is dried by the oven in which hot air is circulated, the anti-wrinkle structure 40 can give the thin carrier 900 a force to expand outwardly along the longitudinal direction, because the thin carrier 900 is pressed against the anti-wrinkle structure 40. As is known, the thin carrier 900, especially paper or film, tends to shrink inwardly when it is dried. By providing the anti-wrinkle structure 40, the degree of shrinkage of the thin carrier 900 inwardly when it is dried can be effectively reduced, because the anti-wrinkle structure 40 gives the thin carrier 900 a force to expand outwardly while the thin carrier 900 is dried.

[0064] Preferably, the anti-wrinkle structure 40 includes a plurality of pairs of the protruding ribs 41. Preferably, one of the protruding ribs 41 in each of the plurality of pairs of the protruding ribs 41 is arranged at one side of the arc surface 1501 along the longitudinal direction, and the other of the protruding ribs 41 is arranged at the other side of the arc surface 1501 along the longitudinal direction. In this way, the distance between the pair of the protruding ribs 41 closer to the side of the arc surface 1501 along the longitudinal direction is greater than the distance between the pair of the protruding ribs 41 farther from the side of the arc surface 1501 along the longitudinal direction.

[0065] More preferably, a plurality of pairs of the anti-wrinkle structure 40 are arranged along the transverse direction.

[0066] As can be understood by those skilled in the art, by such an arrangement, the degree of deformation of the thin carrier 900 due to drying can be effectively reduced.

[0067] It is worth mentioning that the cross-sectional dimension of the mounting cavity 103 in the vertical direction gradually decreases from the position where the fan 30 is mounted to the discharge end 103 along the direction from the feed end 101 to the discharge end 103. As can be understood by those skilled in the art, because the amount of gas in the mounting cavity 103 of the fan is greater closer to the position where the fan 30 is mounted and is smaller farther from the position where the fan 30 is mounted, by gradually decreasing the cross-sectional dimension of the mounting cavity 103 in the vertical direction from the position where the fan 30 is mounted to the discharge end 103 along the direction from the feed end 101 to the discharge end 103, the consistency of the gas pressure in the mounting cavity 103 along the direction from the feed end 101 to the discharge end 103 can be ensured as much as possible, so that the size of the wind force formed by the hot air blown out of the air outlet 104 can be kept as consistent as possible, thereby effectively reducing the shaking of the thin carrier 900.

[0068] Those skilled in the art will understand that the embodiments of the application described above and shown in the drawings are merely illustrative and that numerous other modifications and configurations can be devised without departing from the principles of the present application. The advantages of the present application have been fully realized and achieved. The functional and structural principles of the present application have been demonstrated and described in the embodiments, and any variations or modifications of the embodiments can be made without departing from the principles of the present application.

Claims

1. Hot-air recirculating oven, characterized in that, The hot air circulating oven comprises: a cabinet, wherein the cabinet has an inlet end and an outlet end; the cabinet forms an installation cavity between the inlet end and the outlet end, and the cabinet also forms a group of air outlets communicating with the installation cavity between the inlet end and the outlet end; the air outlets are arranged obliquely towards the outlet end; a lateral direction is defined from the inlet end to the outlet end; on at least one side of the two sides in the longitudinal direction of the installation cavity, the cabinet also forms at least one return air passage separated from the installation cavity and a group of return air holes communicating with the return air passage; at least one fan arranged in the installation cavity of the cabinet near the inlet end, and the return air passage is communicated with the air inlet of the fan near the inlet end; and at least one group of heat generators arranged in the installation cavity and located on the flow path of the flowing air formed by the fan; The cabinet has a cabinet body and an air outlet plate, wherein the cabinet body forms the installation cavity, the air outlet plate forms the air outlet, and the air outlet plate covers the installation cavity; the cabinet also includes at least one partition plate arranged in the installation cavity to separate the installation cavity into a first installation cavity and a second installation cavity, and a communication passage is formed between the partition plate and the air outlet plate to enable the first installation cavity and the second installation cavity to communicate through the communication passage; The cabinet also includes a return air plate, wherein the return air plate is arranged at the outlet end and is arranged obliquely towards the inlet end with the top higher than the return air holes; the return air plate is arranged to extend along the longitudinal direction, the air outlet plate is between the return air plate and the inlet end, and a return air hole is formed near the return air plate; the return air passage is communicated with the installation cavity near the outlet end, wherein the return air hole is communicated with the return air passage; The cabinet also includes a cover plate, wherein the two sides of the cover plate are mounted on the two sides of the cabinet in the longitudinal direction and form a material body passage with the air outlet plate for the thin carrier to pass through.

2. The hot air recirculating oven according to claim 1, wherein The aperture of the return air hole gradually decreases from the outlet end to the inlet end.

3. The hot air recirculating oven of claim 1, wherein, The distance between adjacent two return air holes gradually decreases from the outlet end to the inlet end.

4. The hot air recirculating oven of claim 1, wherein, The communication passage is arranged on the two sides of the longitudinal direction, so that the hot air flowing back from the return air hole can be more guided by the fan to the second installation cavity through the communication passage.

5. The hot air recirculating oven of claim 1, wherein, The hot air circulating oven includes a plurality of heat generators, wherein the plurality of heat generators are arranged at intervals along the lateral direction.

6. The hot air recirculating oven of claim 5, wherein, A plurality of heat generators are arranged at equal intervals along the lateral direction.

7. Method of work performed by means of a hot-air recirculating oven as claimed in any one of the claims 1 to 6, characterized in that, The method comprises the steps of: heating the air flow in the installation cavity by a group of heat generators; The air flow is guided out of the air outlet by the fan, and the air flow out of the air outlet and communicated with the installation cavity is guided into the material body channel to dry the thin carrier. The used air flow is partially returned to the return air channel from the return air return, and then flows to the air inlet of the fan. Part of the air flow is blocked by the return air plate and returned to the installation cavity from the return air outlet, and part of the air flow returned from the return air outlet flows to the air inlet of the fan through the return air channel.

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