A preheater for a corrugated board production line

Abstract

The application relates to a preheater for a corrugated board production line, which comprises a preheating bin provided with a conveying channel, a conveyor arranged in the conveying channel and used for conveying corrugated paper, a steam generator arranged on the preheating bin and provided with two steam chambers containing steam, two steam conveying bins arranged oppositely inside the conveying channel and located on the upper and lower sides of the conveyor, the steam chambers being communicated with the corresponding steam conveying bins, and a plurality of air injection holes being formed on the side of the steam conveying bin close to the conveyor. The preheater can preheat the conveying channel and the corrugated paper through the steam conveying bin, steam is injected to the corrugated paper through the plurality of air injection holes on the steam conveying bin, the upper and lower surfaces of the corrugated paper are heated at the same time, the corrugated paper is uniformly heated in the conveying process through omnibearing heating, and the preheating efficiency of the corrugated paper is improved.

Description

Technical Field

[0001] This application relates to the field of corrugated paper processing technology, and in particular to a preheater for a corrugated cardboard production line. Background Technology

[0002] Preheating is a crucial step in the corrugated board production process, significantly impacting its quality and performance. Proper preheating ensures even moisture distribution in the corrugated paper, enhancing its flexibility and adhesion, thereby improving the strength and flatness of the final corrugated board.

[0003] However, existing corrugated cardboard preheating equipment mainly relies on electric heating rollers for heating. In actual use, the electric heating rollers transfer heat to the corrugated paper through contact heat transfer. Since heat transfer takes a certain amount of time and the heat transfer area is relatively limited, the entire preheating process takes a long time and the preheating efficiency is low. The low efficiency of the preheating stage affects the subsequent processing stages.

[0004] In addition, the electric heating roller comes into direct contact with the surface of the corrugated paper during rotation, which inevitably applies a certain amount of pressure to the paper. For relatively thin corrugated paper, this continuous pressure can cause pressure marks on the paper surface to some extent, which can lead to deformation problems. Slight deformation may reduce the flatness of the corrugated cardboard, affecting the subsequent processing and packaging effects, and impacting the overall strength of the corrugated cardboard.

[0005] To address the aforementioned issues, a preheater for a corrugated cardboard production line is now designed. Utility Model Content

[0006] This application provides a preheater for a corrugated cardboard production line to solve the problems of existing corrugated cardboard preheating equipment in the related art, which mainly rely on electric heating rollers for heating, resulting in a long preheating process and pressure on the surface of the corrugated paper.

[0007] In one aspect, a preheater for a corrugated cardboard production line is provided, comprising:

[0008] The preheating chamber has a conveying channel, in which a conveyor is installed for conveying corrugated paper. The preheating chamber is equipped with a steam generator, which has two steam chambers for containing steam.

[0009] The conveying channel has two steam conveying chambers located opposite each other on the upper and lower sides of the conveyor. The steam chamber is connected to the corresponding steam conveying chamber, and the steam conveying chamber has multiple jet holes on the side closer to the conveyor.

[0010] In some embodiments, the preheating chamber is n-shaped, hollow inside, and open at both ends to form a conveying channel.

[0011] In some embodiments, the conveyor includes two side fixing frames disposed opposite to each other inside the conveying channel, two rotating shafts rotatably disposed between the two side fixing frames, multiple sprockets disposed on the rotating shafts, conveying chains being drivenly connected to the outer sides of the two opposite sprockets, the multiple conveying chains forming a conveyor belt for conveying corrugated paper, and multiple supports located inside the conveying chains being disposed between the two side fixing frames.

[0012] A mounting base is provided on one side of the side fixing frame. A drive motor and a reducer are provided on the mounting base. The output shaft of the drive motor is connected to the input shaft of the reducer. The output shaft of the reducer is connected to one end of any rotating shaft.

[0013] In some embodiments, the steam generator includes a housing disposed on a preheating chamber, two steam chambers disposed opposite each other inside the housing, the two steam chambers separating the housing to form a central mounting chamber, and a plurality of electric heating rods disposed opposite each other inside the mounting chamber, one end of each electric heating rod extending into the corresponding steam chamber.

[0014] In some embodiments, a conveying pipe is connected to the steam chamber, and the other end of the conveying pipe is connected to the corresponding steam conveying chamber;

[0015] A water injection valve is connected to the steam chamber.

[0016] In some embodiments, the steam delivery chamber is a rectangular box with an internal cavity for containing steam. The steam delivery chamber has multiple fixed feet arranged opposite each other, and the other end of the fixed feet is connected to the inner wall of the preheating chamber.

[0017] This application provides a preheater for a corrugated cardboard production line. Steam is generated by a steam generator and sent into a steam conveying chamber. The upper and lower steam conveying chambers are equivalent to two heat sources to preheat the conveying channel and the corrugated paper. Steam is injected into the corrugated paper through multiple jet holes on the steam conveying chamber, so that the steam can heat the upper and lower surfaces of the corrugated paper simultaneously. Through all-round heating, the problem of uneven local temperature that may be caused by traditional one-way heating is avoided. This allows the corrugated paper to be heated evenly during the conveying process, improves the preheating efficiency of the corrugated paper, and thus improves the production quality of the subsequent corrugated cardboard.

[0018] By using indirect steam heating, there is no direct pressure contact between the steam and the corrugated paper. No additional pressure is applied to the surface of the corrugated paper during the preheating process, which effectively avoids the problem of pressure marks and deformation on the surface of the corrugated paper caused by pressure. This ensures the integrity and flatness of the corrugated paper and reduces the waste of raw materials and production quality problems caused by paper deformation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural schematic diagram provided for an embodiment of this application;

[0021] Figure 2 A frontal sectional view provided for an embodiment of this application;

[0022] Figure 3 A three-dimensional schematic diagram of the conveyor provided in the embodiments of this application;

[0023] Figure 4 A three-dimensional schematic diagram of the steam conveying chamber provided in an embodiment of this application.

[0024] In the diagram: 1. Preheating chamber; 2. Conveying channel; 3. Conveyor; 4. Steam generator; 5. Steam chamber; 6. Steam conveying chamber; 7. Conveying pipe; 8. Water injection valve; 61. Jet nozzle; 62. Fixing foot; 31. Side fixing frame; 32. Rotating shaft; 33. Sprocket; 34. Conveying chain; 35. Bracket; 36. Mounting base; 37. Drive motor; 38. Reducer; 41. Housing; 42. Mounting chamber; 43. Electric heating rod. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] This application provides a preheater for a corrugated cardboard production line, which solves the problems of existing corrugated cardboard preheating equipment in the related art, which mainly rely on electric heating rollers for heating, resulting in a long preheating process and pressure on the surface of the corrugated paper.

[0027] Please see Figures 1-3A preheater for a corrugated cardboard production line includes: a preheating chamber 1 having a conveying channel 2, a conveyor 3 being installed in the conveying channel 2 for conveying corrugated paper, a steam generator 4 being installed on the preheating chamber 1 having two steam chambers 5 for containing steam; and two steam conveying chambers 6 located opposite each other on the upper and lower sides of the conveyor 3 inside the conveying channel 2, the steam chambers 5 being connected to the corresponding steam conveying chambers 6, and the side of the steam conveying chamber 6 closest to the conveyor 3 having multiple air jets 61.

[0028] When the preheater starts working, the steam generator 4 heats the water in the steam chamber 5 to vaporize it and generate steam. The steam is stored in the two steam chambers 5 respectively. At the same time, the conveyor 3 starts and smoothly transports the corrugated paper through the conveying channel 2 in the preheating chamber 1.

[0029] At the same time, the steam chamber 5 delivers steam to the corresponding steam conveying chamber 6. After entering the steam conveying chamber 6, the steam is evenly sprayed out from the jet hole 61. Since the two steam conveying chambers 6 are arranged opposite each other on the upper and lower sides of the conveyor 3, the steam can heat the corrugated paper in the conveying process from both the upper and lower directions at the same time, so as to achieve full preheating of the corrugated paper.

[0030] Steam is generated by steam generator 4 and sent into steam conveying chamber 6. The upper and lower steam conveying chambers 6 are equivalent to two heat sources to preheat the conveying channel 2 and the corrugated paper. Steam is injected into the corrugated paper through multiple jet holes 61 on the steam conveying chamber 6, so that the steam can heat the upper and lower surfaces of the corrugated paper at the same time. Through all-round heating, the problem of uneven local temperature that may be caused by traditional one-way heating is avoided. The corrugated paper can be heated evenly during the conveying process, improving the preheating efficiency of the corrugated paper and thus improving the production quality of the subsequent corrugated board.

[0031] During the bonding process, uniform temperature and moisture conditions facilitate the full penetration and curing of the adhesive, ensuring a good bond between the corrugated paper and the linerboard, and improving the bonding strength and flatness of the corrugated board. Simultaneously, uniform preheating reduces quality issues such as warping and deformation during production, resulting in more stable and reliable corrugated board quality that meets diverse customer requirements and enhances the product's market competitiveness.

[0032] Steam heating is a highly efficient heat transfer method. Steam itself carries a large amount of heat energy. When steam is ejected from the jet nozzle 61 and comes into contact with the corrugated paper, it can quickly transfer heat to the corrugated paper, causing the corrugated paper to heat up rapidly. Compared with traditional heating methods, such as electric roller heating, steam heating does not require a long heat accumulation and conduction process, which greatly shortens the preheating time and improves the efficiency of the entire preheating process, meeting the needs of high-speed and continuous production of corrugated cardboard production lines.

[0033] By using indirect steam heating, there is no direct pressure contact between the steam and the corrugated paper. No additional pressure is applied to the surface of the corrugated paper during the preheating process, which effectively avoids the problem of pressure marks and deformation on the surface of the corrugated paper caused by pressure. This ensures the integrity and flatness of the corrugated paper and reduces the waste of raw materials and production quality problems caused by paper deformation.

[0034] like Figure 1 As shown, it should be noted that the preheating chamber 1 described in this embodiment is n-shaped, hollow inside and open at both ends to form a conveying channel 2.

[0035] The preheating chamber 1 is n-shaped and hollow inside, with openings at both ends to form a conveying channel 2. Corrugated paper enters the conveying channel 2 from the opening at one end of the preheating chamber 1, and the conveyor 3 smoothly transports the corrugated paper along the conveying channel 2 to the other end.

[0036] like Figure 2 and Figure 3 As shown, in one embodiment, the conveyor 3 includes two side fixing frames 31 disposed opposite to each other inside the conveying channel 2. Two rotating shafts 32 are rotatably disposed between the two side fixing frames 31. Multiple sprockets 33 are disposed on the rotating shafts 32. A conveying chain 34 is drivenly connected to the outer side of the two opposite sprockets 33. The multiple conveying chains 34 are arranged to form a conveyor belt for conveying corrugated paper. Multiple brackets 35 are disposed between the two side fixing frames 31 and located inside the conveying chain 34. A mounting base 36 is disposed on one side fixing frame 31. A drive motor 37 and a reducer 38 are disposed on the mounting base 36. The output shaft of the drive motor 37 is connected to the input shaft of the reducer 38. The output shaft of the reducer 38 is connected to one end of any rotating shaft 32.

[0037] When the preheating stage of the corrugated cardboard production line is about to begin, the drive motor 37 starts running after being powered on. Its output shaft rotates at a set speed, and the power generated by the drive motor 37 is transmitted to the reducer 38. The reducer 38 reduces the high-speed power input and increases the torque, so that its output shaft rotates at a speed suitable for conveying corrugated paper, and transmits the power to the rotating shaft 32. When one of the rotating shafts 32 rotates, since multiple sprockets 33 are set on the rotating shaft 32, the rotation of the rotating shaft 32 will drive the sprockets 33 to rotate synchronously. The rotation of the sprockets 33 will drive the conveyor chain 34 to move in a cycle. Multiple conveyor chains 34 form a conveyor belt for conveying corrugated paper. As the conveyor chain 34 moves in a cycle, the conveyor belt also starts to run. As the conveyor belt runs, the paper is transported from one end of the preheating chamber 1 to the other end, and is preheated by steam during the transport process.

[0038] As the conveyor chain 34 circulates and carries the corrugated paper, the support 35 provides additional support to the conveyor chain 34, preventing it from sagging or deforming excessively due to the weight of the corrugated paper, and ensuring that the conveyor belt maintains a stable and horizontal conveying state.

[0039] like Figure 1 and Figure 2 As shown, the steam generator 4 in this embodiment includes a housing 41 disposed on the preheating chamber 1, two steam chambers 5 disposed opposite each other inside the housing 41, the two steam chambers 5 separating the housing 41 to form an installation chamber 42 located in the middle, and a plurality of electric heating rods 43 disposed opposite each other inside the installation chamber 42, one end of the electric heating rods 43 extending into the corresponding steam chamber 5.

[0040] After the preheating of the corrugated cardboard begins, the steam generator 4 enters the working preparation state. First, an appropriate amount of water is injected into the two steam chambers 5 inside the housing 41 of the steam generator 4. The amount of water needs to be controlled according to the production requirements and the specifications of the steam generator 4 to ensure that sufficient and stable steam can be generated.

[0041] Subsequently, the power is turned on, and multiple electric heating rods 43 arranged opposite each other in the installation chamber 42 begin to heat up. One end of the electric heating rod 43 extends into the corresponding steam chamber 5, and the heat generated can be directly transferred to the water in the steam chamber 5. As the electric heating rod 43 continues to heat up, the water temperature in the steam chamber 5 continues to rise. When the water temperature reaches the boiling point, the water begins to vaporize and gradually turns into steam. As the heating time extends, steam is continuously generated and accumulates in the steam chamber 5, causing the pressure in the steam chamber 5 to gradually increase.

[0042] After sufficient high-temperature and high-pressure steam is generated in the steam chamber 5, the steam will be transported to the steam transport chamber 6 through the transport pipe 7 to provide a heat source for the preheating of the corrugated paper in the preheating chamber 1. The two steam chambers 5 are arranged opposite each other and jointly provide steam for steam transport, which can ensure the stability and continuity of steam supply.

[0043] like Figure 1 Figure 2 As shown, it should be noted that the steam chamber 5 is connected to a conveying pipe 7, and the other end of the conveying pipe 7 is connected to the corresponding steam conveying chamber 6; the steam chamber 5 is connected to a water injection valve 8.

[0044] After the steam generator 4 generates steam normally, the steam will accumulate in the steam chamber 5. The other end of the conveying pipe 7 is connected to the corresponding steam conveying chamber 6. According to the principle of steam pressure difference, when the steam pressure in the steam chamber 5 reaches a certain level, the high temperature and high pressure steam will automatically flow to the steam conveying chamber 6 along the conveying pipe 7. The steam is further distributed in the steam conveying chamber 6, and then sprayed onto the corrugated paper through multiple evenly distributed jet holes 61 on the steam conveying chamber 6 to achieve preheating of the corrugated paper.

[0045] After the steam generator 4 has been running for a period of time, the water in the steam chamber 5 will decrease due to continuous vaporization. In order to ensure that the steam generator 4 can continuously and stably produce steam, it is necessary to replenish the water in the steam chamber 5 in a timely manner. At this time, water injection is performed through the water injection valve 8 connected to the steam chamber 5.

[0046] Understandably, the other end of the water injection valve 8 is connected to an external water source pipe. After the water injection valve 8 is opened, water will flow into the steam chamber 5 under pressure. When the water level in the steam chamber 5 reaches a suitable height, the water injection valve 8 is closed to ensure that the steam generator 4 can work normally and efficiently.

[0047] like Figure 2 and Figure 4 As shown, in one embodiment, the steam conveying chamber 6 is a rectangular box with a cavity inside for containing steam. The steam conveying chamber 6 is provided with a plurality of fixed feet 62 opposite to each other, and the other end of the fixed feet 62 is connected to the inner wall of the preheating chamber 1.

[0048] The steam conveying chamber 6 is equipped with multiple fixing feet 62. The other end of the fixing feet 62 is connected to the inner wall of the preheating chamber 1. The connection method can be welding or bolting to ensure that the steam conveying chamber 6 can be firmly fixed in the preheating chamber 1.

[0049] When the steam generated by the steam generator 4 is delivered to the steam delivery chamber 6 through the delivery pipe 7, the steam will fill the chamber 6 used to contain the steam. Since the steam delivery chamber 6 is a rectangular box, the steam will be evenly distributed inside the chamber. Multiple jet holes 61 evenly distributed on the steam delivery chamber 6 will eject the steam at a certain pressure and speed, so as to fully and evenly preheat the corrugated paper conveyed in the preheating chamber 1, ensuring that the preheating effect of the corrugated paper is consistent.

[0050] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0051] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A preheater for a corrugated board line, characterized in that include: A preheating chamber (1) has a conveying channel (2) and a conveyor (3) is provided in the conveying channel (2). The conveyor (3) is used to convey corrugated paper. A steam generator (4) is provided on the preheating chamber (1). The steam generator (4) has two steam chambers (5) for containing steam. The conveying channel (2) has two steam conveying chambers (6) located on the upper and lower sides of the conveyor (3) respectively. The steam chamber (5) is connected to the corresponding steam conveying chamber (6). The steam conveying chamber (6) has multiple jet holes (61) on the side closer to the conveyor (3).

2. The preheater for a corrugated cardboard production line as described in claim 1, characterized in that: The preheating chamber (1) is n-shaped, hollow inside and open at both ends to form a conveying channel (2).

3. The preheater for a corrugated cardboard production line as described in claim 1, characterized in that: The conveyor (3) includes two side fixing frames (31) arranged opposite to each other inside the conveying channel (2). Two rotating shafts (32) are arranged relative to each other between the two side fixing frames (31). Multiple sprockets (33) are arranged on the rotating shafts (32). A conveying chain (34) is connected to the outside of the two sprockets (33) that are opposite to each other. The multiple conveying chains (34) are arranged to form a conveyor belt for conveying corrugated paper. Multiple supports (35) are arranged between the two side fixing frames (31) and located inside the conveying chain (34). A mounting base (36) is provided on one side of the side fixing bracket (31). A drive motor (37) and a reducer (38) are provided on the mounting base (36). The output shaft of the drive motor (37) is connected to the input shaft of the reducer (38). The output shaft of the reducer (38) is connected to one end of any rotating shaft (32).

4. The preheater for a corrugated cardboard production line as described in claim 1, characterized in that: The steam generator (4) includes a housing (41) disposed on the preheating chamber (1), two steam chambers (5) disposed opposite each other inside the housing (41), the two steam chambers (5) separating the housing (41) to form an installation chamber (42) located in the middle, and a plurality of electric heating rods (43) disposed opposite each other inside the installation chamber (42), one end of the electric heating rods (43) extending into the corresponding steam chamber (5).

5. A preheater for a corrugated cardboard production line as described in claim 1, characterized in that: The steam chamber (5) is connected to a conveying pipe (7), and the other end of the conveying pipe (7) is connected to the corresponding steam conveying chamber (6); A water injection valve (8) is connected to the steam chamber (5).

6. A preheater for a corrugated cardboard production line as described in claim 1, characterized in that: The steam delivery chamber (6) is a rectangular box with a cavity for containing steam inside. Multiple fixed feet (62) are arranged opposite each other on the steam delivery chamber (6), and the other end of the fixed feet (62) is connected to the inner wall of the preheating chamber (1).

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