Preheater for preparing corrugated board

Abstract

The utility model relates to a preheater for preparing corrugated boards, and belongs to the technical field of corrugated board production, the preheater comprises two wallboards which are symmetrically arranged, a preheating cylinder and a paper guide roller are arranged between the two wallboards, the two ends of the preheating cylinder are closed, shaft heads of the preheating cylinder are fixedly connected with the corresponding wallboards, an inner container is arranged in the preheating cylinder, and the paper guide roller is arranged in the inner container. A pressure container cavity is arranged between the inner wall of the preheating cylinder and the outer wall of the inner container, and the pressure container cavity is formed by a circle along the outer wall of the inner container. A steam inlet pipe and a water outlet pipe are arranged on the preheating cylinder, one end of the steam inlet pipe is communicated with the interior of the pressure container cavity and located above the inner container, and one end of the water outlet pipe is communicated with the interior of the pressure container cavity and located below the inner container; the paper guide roller is rotationally arranged between the two wall plates, the axis distance between the preheating cylinder and the paper guide roller serves as the rotating radius to wrap the preheating cylinder to move, the problem that a siphon of a traditional preheater and the inner hole wall of a shaft head are abraded is solved, the preheating effect of the preheater is improved, and the heat utilization rate of the preheater is increased.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of corrugated paper, and in particular to a preheater for preparing corrugated paperboard. BACKGROUND

[0002] In the process of making corrugated paperboard, in the early preparation link, first, corrugated paper or core paper (also known as inner paper) is heated to above 100 DEG C by a preheater: (1) drying part of the water; (2) providing heat for plastic deformation for the next main machine (corrugating machine) so as to avoid extrusion and cracking of the corrugated paper or core paper when being pressed and deformed by corrugating rollers; (3) providing an initial temperature for adhesion of the corrugated paper or core paper (inner paper), because the glue solution for adhesion of the corrugated paper and the core paper has a low temperature and is a semi-mature glue solution, the paper needs to have a temperature to be pasted and then firmly adhered. This is an indispensable process requirement before the corrugated paperboard is formed.

[0003] The mainstream preheater is mostly heated by steam, and the preheater is mostly made into a round roller shape, with an outer diameter of ф300-ф1200mm, a wall thickness of 8-20mm, and a roller surface width of 1400-3500mm. The left and right two end faces of the round roller are welded with outward convex heads or flat steel plate heads, and two shaft heads are inserted and welded on the inner wall of the cylinder. One end of the solid shaft head is fixed on the wall plate on one side of the equipment through a bearing, and the other end of the shaft head is a hollow shaft head which is also fixed on the wall plate on the other side of the equipment through a bearing. The hollow shaft head is connected with the steam pipeline and the rotary joint in the preheater cavity, so that hot steam can be filled in the preheater cavity under the premise of steam pressure, enough heat is provided for the paper, and the condensed water is also pressed into the siphon pipe in the core of the rotary joint in the hollow shaft head, and then the condensed water is discharged from the preheater. In this way, the steam enters from the pipeline and the rotary joint, and the water is discharged from the siphon pipe arranged in the core of the rotary joint, forming a closed heat exchange circulation path. The preheater is a pressure vessel with steam as the medium.

[0004] REFERENCE Figure 1The drawbacks and defects of traditional preheaters: ① The pursuit of large outer diameters, mostly around φ1000mm, results in excessively large container capacity. In paperboard production, the outer circle angle of the preheating roller covering the base paper rarely exceeds 180 degrees, meaning that essentially half of the paper is not covered, causing half of the heat to be wasted through radiation. ② In traditional paperboard production, the cylinder is driven by a small-power reduction motor to rotate slowly, aiming for uniform heating at every angle and part. However, the siphon tubes 8 are approximately one inch stainless steel tubes, installed on the inner core of the rotary joint at the outer end of the shaft. The siphon tube 8, fixed at the shaft end, is on the axis of the roller. Taking a φ1000mm roller as an example: the height difference between the siphon tube 8 and the bottom of the inner cavity is about 500mm, while the inner hole of the shaft end is often around φ60mm and about 500mm long. Moreover, the bent siphon tube 8 not only needs to ensure the bending height difference, but the end of the siphon tube 8 must also be able to align with the bottom of the preheater inner cavity. The siphon tube 8 must be tangentially inside the shaft head to effectively remove condensate. This requires a large bending radius to allow it to pass smoothly through the inner hole of the shaft head and be fixed to the inner core of the rotary joint. Due to the limited diameter of the inner hole of the shaft head, it is often difficult to handle the bending radius at the 500mm end of the shaft head. If the bending is not done properly, there will often be contact between the bend and the inner wall of the shaft head. When the preheater rotates circumferentially, the bend of the siphon tube 8 will constantly rub against the inner wall of the shaft head, which can easily wear out the siphon tube 8. As a result, the siphon tube 8 cannot completely drain the condensate, often resulting in a high condensate level in the preheater, which in turn affects the temperature of the preheater and the preheating effect of the raw paper. Utility Model Content

[0005] In order to solve the problem of wear between the siphon tube and the inner wall of the shaft head, and to improve the preheating effect and heat utilization rate of the preheater, this application provides a preheater for preparing corrugated cardboard.

[0006] The preheater for preparing corrugated cardboard provided in this application adopts the following technical solution:

[0007] A preheater for preparing corrugated cardboard includes two symmetrically arranged wall panels. A preheating cylinder and a paper guide roller are disposed between the two wall panels. The preheating cylinder is closed at both ends, and its shaft head is fixedly connected to the corresponding wall panel. An inner liner is disposed inside the preheating cylinder. A pressure vessel chamber is disposed between the inner wall of the preheating cylinder and the outer wall of the inner liner, and the pressure vessel chamber is opened around the outer wall of the inner liner. A steam inlet pipe and a water outlet pipe are disposed on the preheating cylinder. One end of the steam inlet pipe is connected to the inside of the pressure vessel chamber and is located above the inner liner. One end of the water outlet pipe is connected to the inside of the pressure vessel chamber and is located below the inner liner. The paper guide roller is rotatably disposed between the two wall panels and moves around the preheating cylinder with the axial distance between the preheating cylinder and the paper guide roller as the radius of rotation.

[0008] By adopting the technical scheme, the preheating cylinder is fixed between two wallboards in a non-rotating fixed manner, and cooperates with the pressure container chamber, thereby avoiding the siphon tube from being worn out in the traditional preheater, and avoiding the occurrence of the adverse phenomenon of half water and half steam. Steam is delivered into the pressure container chamber through the steam inlet pipe, and the generated condensed water is discharged through the water outlet pipe. The setting of the pressure container chamber reduces the volume, and the steam delivery amount and steam consumption are also reduced, and the same preheating effect as the traditional preheater is achieved. In the use process of the preheating roller, the raw paper changes the angle of covering the outer wall of the preheating cylinder with the movement of the paper guide roller, thereby improving the heat radiation utilization rate of the preheating cylinder.

[0009] Optionally, the preheating cylinder is provided with a temperature sensor, and the temperature sensor is used to timely transmit the information that the steam in the pressure container chamber changes into water.

[0010] By adopting the technical scheme, the temperature sensor can timely transmit the information that the steam in the pressure container chamber changes into water, so that the drain control system of the intelligent temperature control system can timely discharge the condensed water, the chamber can maintain a saturated steam state, sufficient heat can be continuously provided for the raw paper, and the preheating effect is further improved.

[0011] Optionally, the temperature sensor is located at the end of the preheating cylinder away from the steam inlet pipe, one end of the temperature sensor is deeply inserted into the inside of the pressure container chamber, and the deep insertion position is above the inner container.

[0012] By adopting the technical scheme, the temperature sensor is located at the end of the preheating cylinder away from the steam inlet pipe and above the inner container of the pressure container chamber, so that the state change of the steam in the chamber can be more accurately monitored, the steam phase change condition can be timely found, more accurate data support can be provided for timely discharge of the condensed water, stable operation of the preheater can be ensured, and the stability of the raw paper preheating effect is ensured.

[0013] Optionally, the horizontal central axes of the preheating cylinder, the inner container and the pressure container chamber are arranged in line.

[0014] By adopting the technical scheme, the horizontal central axes of the preheating cylinder, the inner container and the pressure container chamber are arranged in line, so that the distribution of the steam in the pressure container chamber is more uniform, the heat transfer is more balanced, the local overheating or overcooling phenomenon caused by the structural asymmetry is avoided, the overall preheating effect of the raw paper is improved, and the consistency of the corrugated paperboard production quality is ensured.

[0015] Optionally, the preheating device further comprises a motor and a gear set, the gear set is provided with two groups and is correspondingly distributed at the two ends of the preheating cylinder, the gear set comprises a first gear and a second gear which are meshed with each other, the motor is fixed on one side of any wallboard, a transmission shaft is fixed on the output end of the motor, two first gears are fixed on the first transmission shaft in a ring sleeve manner, the second gear is rotationally arranged on the wallboard and the rotation axis coincides with the central axis of the preheating cylinder, and the end portion of the paper guide roller is rotationally arranged on the edge of the corresponding second gear close to the edge.

[0016] By adopting the technical scheme, the motor and the gear set are arranged, the first gear is driven by the motor to drive the transmission shaft, and then the second gear is rotated to realize the rotation of the paper guide roller, the movement of the paper guide roller wrapping the preheating cylinder can be accurately controlled, the wrapping angle of the raw paper can be accurately adjusted, the preheating degree can be better adjusted according to different characteristics of the raw paper and production requirements, the automation and intelligent level of the preheater are improved, the purposes of energy saving and consumption reduction and optimization of production are achieved.

[0017] Optionally, a connecting seat is arranged between the second gear and the paper guide roller, the connecting seat is fixed at the edge of the second gear, and the paper guide roller is rotationally arranged on the connecting seat.

[0018] By adopting the technical scheme, the connecting seat is arranged between the second gear and the paper guide roller, and the paper guide roller rotates relative to the connecting seat, so that the paper guide roller can flexibly rotate while moving to wrap the preheating cylinder, the friction of the raw paper in the conveying process is reduced, the surface of the raw paper is prevented from being damaged, the quality of the raw paper is ensured, the wrapping angle of the raw paper is helped to be more smoothly adjusted, and the preheating effect and production efficiency are further improved.

[0019] In summary, the present application has at least one of the following beneficial technical effects:

[0020] 1. Improve heat utilization rate: form a closed pressure container chamber between the inner wall of the large roller and the outer wall of the inner container, optimize the steam inlet and outlet mode, reduce the steam volume and steam consumption, and avoid waste of heat;

[0021] 2. Improve the preheating effect: the fixed non-rotating preheating cylinder structure avoids the problem that the condensate water is not fully discharged due to the siphon pipe being worn out in the traditional preheater; the temperature sensor is arranged to cooperate with the existing intelligent temperature control system to timely discharge the condensate water and ensure the supply of saturated steam in the cavity;

[0022] 3. The paper guide roller can adjust the wrapping angle of the raw paper, and accurately control the preheating degree according to the characteristics of the raw paper and the production speed requirement. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure schematic view of the position of the siphon pipe;

[0024] Figure 2 is a whole structure schematic view of the embodiment of the present application;

[0025] Figure 3 is a vertical structure sectional view for showing the internal structure of the preheating cylinder.

[0026] In the figure, 1, wall plate; 2, preheating cylinder; 21, inner container; 22, pressure container chamber; 23, steam inlet pipe; 24, water outlet pipe; 3, paper guide roller; 4, temperature sensor; 5, motor; 51, transmission shaft; 6, gear set; 61, first gear; 62, second gear; 7, connecting seat; 8, siphon. DETAILED DESCRIPTION

[0027] The following description will be made in conjunction with the accompanying drawings Figures 2-3 The application is further described in detail.

[0028] The embodiment of the application discloses a preheater for preparing corrugated paperboard.

[0029] Reference Figure 2 and Figure 3 The preheater for preparing corrugated paperboard comprises two symmetrically arranged wall plates 1, a preheating cylinder 2, a paper guide roller 3, a temperature sensor 4, a motor 5 and a gear set 6.

[0030] Reference Figure 2 The two wall plates 1 serve as the support structure of the whole preheater and provide a mounting basis for other components. The preheating cylinder 2 is arranged between the two wall plates 1. The preheating cylinder 2 is closed at both ends, and the shaft head is fixedly connected to the corresponding wall plate 1. This fixed mode is different from that of a traditional preheater, and the rotation of the shaft head of the traditional preheater easily causes the siphon to rub against the inner hole wall of the shaft head, while the embodiment effectively avoids this problem.

[0031] Reference Figure 2 and Figure 3 The preheating cylinder 2 is internally provided with an inner container 21, and a pressure container chamber 22 is formed between the inner wall of the preheating cylinder 2 and the outer wall of the inner container 21, which is opened along the outer wall of the inner container 21. The horizontal central axes of the preheating cylinder 2, the inner container 21 and the pressure container chamber 22 are arranged in the same line. The preheating cylinder 2 is provided with a steam inlet pipe 23 and a water outlet pipe 24, one end of the steam inlet pipe 23 is in communication with the inside of the pressure container chamber 22 and is located above the inner container 21, and one end of the water outlet pipe 24 is in communication with the inside of the pressure container chamber 22 and is located below the inner container 21. During work, steam enters the pressure container chamber 22 from the steam inlet pipe 23 to provide heat for the raw paper, and the steam becomes condensed water after heat release and is discharged through the water outlet pipe 24. Compared with the traditional preheater, this structure design reduces the volume of the preheater, reduces the steam volume and steam consumption, improves the heat utilization rate, and solves the problem of heat waste caused by the large capacity of the traditional preheater container.

[0032] Reference Figure 3, the temperature sensor 4 is located at the end of the preheating cylinder 2 away from the steam inlet pipe 23, and one end of the temperature sensor 4 extends into the inside of the pressure container chamber 22 and is located above the inner container 21. The temperature sensor 4 is used to timely transmit the information that the steam in the pressure container chamber 22 becomes water. When the temperature sensor 4 detects a temperature change, the temperature at the bottom of the pressure container chamber 22 reaches 100 degrees (which can be set to 110 degrees), that is, the information that the steam becomes water, a signal is transmitted to the drain control system (not shown in the figure) of the intelligent temperature control system, the drain control system timely drains the condensed water, so that the pressure container chamber 22 always contains saturated steam, thereby continuously providing sufficient heat to the raw paper and ensuring the preheating effect of the raw paper.

[0033] With reference to Figure 2 And Figure 3 The paper guide roller 3 is rotatably arranged between the two wallboards 1, and the motor 5 cooperates with the gear set 6 to realize the rotation of the paper guide roller 3 relative to the preheating cylinder 2. The gear set 6 is provided with two sets and is correspondingly distributed at the two ends of the preheating cylinder 2, each set of gear set 6 includes a first gear 61 and a second gear 62. The motor 5 is fixed on the side of any one wallboard 1 away from the preheating cylinder 2, the motor 5 adopts a servo motor and can be connected with a speed reducer, a transmission shaft 51 is fixed on the output end of the motor 5, the transmission shaft 51 is rotatably arranged on the wallboard 1, two first gears 61 are fixed on the transmission shaft 51 in a ring sleeve manner, the second gear 62 is rotatably arranged on the wallboard 1 and the rotation axis line coincides with the central axis line of the preheating cylinder 2, and the first gear 61 and the second gear 62 are meshed with each other. The paper guide roller 3 and the edge of the second gear 62 are provided with a connecting seat 7, and the connecting seat 7 is correspondingly provided with two. The connecting seat 7 is fixed at the edge of the second gear 62, the end of the paper guide roller 3 is rotatably arranged on the connecting seat 7, and the paper guide roller 3 rotates relative to the connecting seat 7.

[0034] In work, the motor 5 is started, the transmission shaft 51 is driven to rotate, the first gear 61 is driven to rotate by the transmission shaft 51, the first gear 61 and the second gear 62 are meshed with each other, so that the second gear 62 is rotated. Since the paper guide roller 3 is connected with the second gear 62 through the connecting seat 7, the rotation of the second gear 62 will drive the paper guide roller 3 to move around the preheating cylinder 2 with the axial distance between the preheating cylinder 2 and the paper guide roller 3 as the rotation radius. This structure design makes the paper guide roller 3 can flexibly adjust the angle of the raw paper covering the preheating cylinder 2, so that the raw paper covers the outer wall of the preheating roller to 0-330 degrees, that is, the raw paper covering angle. The automatic angle control system (not shown in the figure) will automatically adjust the position of the paper guide roller 3 through the operation of the motor 5 according to several variable values such as the water content value of the raw paper, the gram weight value per square meter, the raw paper material type and the production line speed value, and then adjust the angle of the raw paper, realize the accurate control of the water content and preheating temperature of the raw paper, match the appropriate paperboard production speed, and achieve the effect of energy saving and consumption reduction automatic speed cruise production.

[0035] In the embodiments of the present application, the outer diameter of the preheating cylinder is ф700, and the inner container is ф457, but the sizes are not limited to the above.

[0036] The embodiments of the present specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A preheater for preparing corrugated cardboard, comprising two symmetrically arranged wall panels (1), characterized in that: A preheating cylinder (2) and a paper guide roller (3) are arranged between the two wall panels (1). The preheating cylinder (2) is closed at both ends and its shaft head is fixedly connected to the corresponding wall panel (1). An inner liner (21) is arranged inside the preheating cylinder (2). A pressure vessel chamber (22) is arranged between the inner wall of the preheating cylinder (2) and the outer wall of the inner liner (21). The pressure vessel chamber (22) is opened around the outer wall of the inner liner (21). A steam inlet pipe (23) and a water outlet pipe (24) are arranged on the preheating cylinder (2). One end of the steam inlet pipe (23) is connected to the inside of the pressure vessel chamber (22) and is located above the inner liner (21). One end of the water outlet pipe (24) is connected to the inside of the pressure vessel chamber (22) and is located below the inner liner (21). The paper guide roller (3) is rotatably arranged between the two wall panels (1) and moves around the preheating cylinder (2) with the axial distance between the preheating cylinder (2) and the paper guide roller (3) as the radius of rotation.

2. The preheater for preparing corrugated cardboard according to claim 1, characterized in that: A temperature sensor (4) is installed on the preheating cylinder (2). The temperature sensor (4) is used to transmit information about the transformation of steam into water in the pressure vessel chamber (22) in a timely manner.

3. A preheater for preparing corrugated cardboard according to claim 2, characterized in that: The temperature sensor (4) is located at the end of the preheating cylinder (2) away from the steam inlet pipe (23), and one end of the temperature sensor (4) extends into the pressure vessel chamber (22) and is located above the inner liner (21).

4. A preheater for preparing corrugated cardboard according to claim 1, characterized in that: The horizontal central axes of the preheating cylinder (2), the inner liner (21), and the pressure vessel chamber (22) are arranged in a collinear manner.

5. A preheater for preparing corrugated cardboard according to claim 1, characterized in that: It also includes a motor (5) and a gear set (6). The gear set (6) has two sets and is distributed at both ends of the preheating cylinder (2). The gear set (6) includes a first gear (61) and a second gear (62) that mesh with each other. The motor (5) is fixed on one side of any wall plate (1). A transmission shaft (51) is fixed on the output end of the motor (5). The two first gears (61) are ring-fixed on the first transmission shaft (51). The second gear (62) is rotatably set on the wall plate (1) and its rotation axis coincides with the central axis of the preheating cylinder (2). The end of the paper guide roller (3) is rotatably set on the edge of the corresponding adjacent second gear (62).

6. A preheater for preparing corrugated cardboard according to claim 5, characterized in that: A connecting seat (7) is provided between the second gear (62) and the paper guide roller (3). The connecting seat (7) is fixed at the edge of the second gear (62). The paper guide roller (3) is rotatably mounted on the connecting seat (7) and rotates relative to the connecting seat (7).

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