Preheating device for corrugated board

Abstract

The utility model discloses a preheating device for a corrugated board, and relates to the field of production equipment. The device comprises a frame, a hollow metal preheating roller is rotatably erected in the frame, paper guide rollers are arranged on the front side and the rear side of the preheating roller, and the paper guide rollers are rotatably erected on the frame. The preheating roller is filled with heat conduction particles, two circular rings are arranged outside the preheating roller in a sliding mode, the two circular rings are installed on the frame in a sliding mode through supporting pieces, and the two circular rings are hollow and provided with induction heating coils. The induction heating device has the advantages that the induction heating coil is packaged through the circular ring, induction heating is carried out on the preheating roller, the structure is simple, maintenance cost is reduced, paper is restrained by adjusting the position of the circular ring, swinging of the paper is limited, production quality of corrugated paper is guaranteed, and the induction heating device is easy to operate, flexible to use and efficient.

Description

Technical Field

[0001] The utility model belongs to the field of production equipment, relates to the field of production of corrugated paperboards, and particularly relates to a preheating device for corrugated paperboards. Background Art

[0002] Corrugated paper is a cardboard material widely used in the packaging industry. During the production of corrugated cardboard, the base paper needs to be preheated to evaporate the excess moisture in the base paper, making the moisture content of the paper uniform. This will achieve better physical properties and stability during the subsequent corrugated forming and bonding process, while reducing quality problems such as cardboard cracking, warping, and poor bonding, ensuring the forming quality of the corrugated cardboard and improving production efficiency.

[0003] Currently, a preheating cylinder is commonly used to preheat the base paper. However, the structure of the preheating cylinder is relatively complex. It requires the introduction of a heat source such as heating steam into the cylinder body, and multiple components such as steam pipes need to be installed in the cylinder body. Dirt and sediment are easily accumulated in the cylinder body after long-term operation. These impurities will cause the flow of the steam heat source to be obstructed, affecting the heating efficiency. Therefore, the preheating cylinder needs to be regularly maintained. However, maintenance requires a certain cost, and the purchase cost of the preheating cylinder and the training cost of personnel, etc., make it have a high cost of use. Moreover, the cylinder body of the commonly used preheating cylinder is usually a roller structure with a smooth surface. After the paper is introduced into the cylinder body, the paper cannot be constrained and will swing along the cylinder body, affecting the production quality of corrugated paper. Utility Model Content

[0004] To address the technical issues of complex preheating cylinder structures, high costs, and paper oscillation, this utility model provides a preheating device for corrugated cardboard. A ring encapsulates an induction heating coil and induction heats the preheating roller, resulting in a simple structure and reduced maintenance costs. Adjusting the ring position constrains the paper, limiting its oscillation and ensuring high-quality corrugated paper production. The device is simple to operate, flexible, and highly efficient.

[0005] The technical solution adopted by the utility model is: to provide a preheating device for corrugated cardboard, comprising a frame, a hollow metal preheating roller rotatably mounted in the frame, paper guide rollers are arranged on the front and rear sides of the preheating roller, and the paper guide rollers are respectively rotatably mounted on the frame; the preheating roller is filled with heat-conducting particles, and two circular rings are slidably arranged on the outside of the preheating roller, and the two circular rings are slidably mounted on the frame by means of a support member, and the interior of the two circular rings is hollow and provided with an induction heating coil.

[0006] After the paper guide roller guides the paper to pass around the preheating roller in the frame, the position of the circular rings on both sides of the preheating roller is adjusted so that the outer end surfaces thereof contact the two sides of the paper, thereby constraining the position of the paper and preventing the paper from swinging when moving along the preheating roller, thereby ensuring production quality. The induction heating coil arranged in the circular ring induction heats the preheating roller. After the heat on the preheating roller is transferred to the paper, the paper is preheated. The rotation of the preheating roller causes the heat-conductive particles filled therein to absorb the heat, roll and re-transmit to various positions of the preheating roller, thereby ensuring uniform heating of the preheating roller and uniform preheating of the paper. At the same time, the preheating device has a simple structure, and the induction heating component is independent of the preheating roller, which simplifies maintenance. Since the preheating roller is only filled with heat-conductive particles, it does not need to be frequently disassembled and maintained, thereby reducing maintenance costs and improving flexibility of use.

[0007] To further optimize the technical solution, the preheating roller includes a metal tube, both ends of the metal tube are sealed and detachably equipped with a cover, the cover is coaxially fixed with an assembly shaft, the assembly shaft is rotatably mounted with the frame, and the frame is equipped with a drive structure, which is drive-connected to the assembly shaft.

[0008] The preheating roller is based on a metal tube. A cover is installed at the tube mouth to seal the heat-conducting particles inside the metal tube to prevent leakage of the heat-conducting particles. It has a simple structure, low manufacturing and maintenance costs, and high cost-effectiveness. The metal tube is assembled on the frame by rotating the assembly shaft on the cover and is driven to rotate by the drive structure to ensure uniformity of induction heating inside the metal tube.

[0009] To further optimize this technical solution, the drive structure includes a matching gearbox and a drive motor, the gearbox is fixedly installed on the outer wall of the frame, and the output shaft of the gearbox passes through the frame and is connected to the assembly shaft by means of a transmission component.

[0010] The driving motor drives the preheating roller through the gear box. The gear box can increase the output torque of the preheating roller and reduce the load inertia of the motor, thereby improving the dynamic response and control accuracy of the preheating roller drive.

[0011] To further optimize this technical solution, the transmission assembly includes a driven gear coaxially mounted on the assembly shaft and a driving gear coaxially mounted on the gearbox output shaft, the diameter of the driving gear is smaller than the diameter of the driven gear, and the driving gear is meshed with the driven gear.

[0012] The diameter of the driving gear is smaller than that of the driven gear, thereby increasing the output torque to the assembly shaft, ensuring smooth rotation of the preheating roller, and the transmission is simple and stable, ensuring reliability in use.

[0013] To further optimize the technical solution, the circular ring includes an open ring body, the induction heating coil is arranged in the ring body, and the open end of the ring body is detachably installed with an annular sealing cover, the sealing cover is in sealing contact with the outer end face of the ring body, and at least two lifting ears are evenly arranged along the circumference on the outer ring wall of the ring body, and the lifting ears are slidably installed with the help of support members and the frame.

[0014] The induction heating coil is arranged in the ring body and sealed by a sealing cover to reduce dust and other impurities from entering the ring body, avoid contamination of the induction heating coil, extend its service life, and ensure safety in use. By adding lifting ears on the outer ring wall of the ring body, it is convenient to assemble with the support parts, ensuring smooth and stable sliding between the ring body and the frame.

[0015] To further optimize the technical solution, the support member includes at least two straight rods arranged on the peripheral side of the preheating roller, both ends of the straight rods are fixedly mounted on the frame, and the lifting ears are slidably mounted on the straight rods and locked with the straight rods by means of locking members.

[0016] The lifting lugs on the ring body are slidably installed on the straight rods in the frame. The straight rods constrain the ring body so that it can only move along the surface of the preheating roller. The rotation of the preheating roller does not interfere with the ring body, and the lifting lugs are locked on the straight rods by locking pieces to ensure the safety and reliability of the ring body.

[0017] To further optimize the technical solution, the locking member includes a tightening bolt threadedly connected to the lifting ear, and the tightening bolts are respectively in contact with the straight rod.

[0018] The lifting lug is locked on the straight rod by a tightening bolt. It has a simple structure, easy operation, and is stable and reliable to use.

[0019] To further optimize the technical solution, a protrusion is provided on the outer ring wall of the ring body along the circumferential direction, and the diameter of the sealing cover is larger than the diameter of the ring body, and the sealing cover is threadedly connected to the protrusion by means of bolts.

[0020] The protrusion on the outer ring wall provides an anchor point for the installation of the sealing cover. The outer diameter of the sealing cover is larger than the outer diameter of the ring body, which provides space for the assembly of the bolts. After the bolts are threadedly connected with the protrusions, the sealing cover is tightened and fixed on the ring body. It has a simple structure and is stable and reliable to use.

[0021] The beneficial effects of the present invention are:

[0022] 1. When the preheating roller is induction heated, it is driven to rotate, causing the heat-conducting particles filled inside it to rotate as well. After absorbing the heat from the preheating roller, the heat-conducting particles continuously change their contact position with the preheating roller as they rotate, and transfer the heat back to the preheating roller, ensuring that the surface of the preheating roller is heated evenly and that the paper is preheated evenly.

[0023] 2. The preheating roller is mainly composed of a metal tube, which is sealed with heat-conducting particles. Since there are no other parts in the tube, it does not need to be disassembled for maintenance. The ring outside the preheating roller does not come into contact with the preheating roller and wear. The closed setting of the ring reduces the contact between the internal induction heating coil and the outside world, avoids contamination, extends its service life, and reduces the number of maintenance times. This reduces the overall maintenance frequency of the equipment, reduces maintenance costs, and improves usage flexibility.

[0024] 3. When the additional lugs on the ring body slide along the straight rod, the ring is driven to slide along the outside of the preheating roller, thereby adjusting its position without interfering with the rotation of the preheating roller, ensuring smooth use. After the outer end faces of the ring body contact the two sides of the paper respectively, the tightening bolts lock the ring body and constrain the paper to prevent it from swinging, thereby ensuring production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the preheating device of this embodiment;

[0026] Figure 2 Schematic diagram of the structure of the framework of this embodiment;

[0027] Figure 3 This is a schematic diagram of the structure of the preheating roller and the ring assembly of this embodiment;

[0028] Figure 4 Schematic diagram of the disassembled structure of the metal tube and the cover of this embodiment;

[0029] Figure 5 Schematic diagram of the structure of the ring in this embodiment;

[0030] Figure 6 Schematic diagram of the disassembled structure of the ring body and the sealing cover of this embodiment.

[0031] In the figure, 1. frame; 2. preheating roller; 201. metal tube; 202. sealing cover; 203. assembly shaft; 2031. driven gear; 3. paper guide roller; 4. ring; 401. ring body; 4011. lifting ear; 40111. tightening bolt; 4012. protrusion; 402. sealing cover; 4021. bolt; 5. induction heating coil; 6. gear box; 601. driving gear; 7. driving motor; 8. straight rod. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0033] Please see the attached Figure 1-4, a preheating device for corrugated cardboard, comprising a frame 1, a hollow metal preheating roller 2 is rotatably mounted in the frame 1, paper guide rollers 3 are provided on both the front and rear sides of the preheating roller 2, the paper guide rollers 3 are rotatably mounted on the frame 1, and the paper guide rollers 3 guide the paper to adhere to the preheating roller 2, the metal preheating roller 2 is mainly composed of a metal tube 201, both ends of the metal tube 201 are sealed and detachably equipped with a cover 202, the cover 202 can be tightened and fixed on the metal tube 201 by means of bolts 4021, and the metal tube 20 1 is provided with a mounting position along the circumferential direction on the inner tube wall, and then the cover 202 is placed against the tube mouth of the metal tube 201. A hole matching the mounting position is provided on the cover 202, and a bolt 4021 is passed through the hole and is threadedly connected with the mounting position, thereby tightening and fixing the cover 202 on the metal tube 201. A sealing gasket is provided on the cover 202 or on the tube mouth of the metal tube 201 to ensure the sealing of the assembly of the cover 202 and the metal tube 201, thereby preventing the leakage of the heat-conducting particles filled in the preheating roller 2;

[0034] Please see the attached Figure 3 , Attachment Figure 4 , the cover 202 is coaxially fixedly mounted with an assembly shaft 203, and the assembly shaft 203 is set in the frame 1 to support the preheating roller 2. The assembly shaft 203 can be set by opening a hole on the frame 1. The assembly shaft 203 is rotatably mounted with the help of a bearing and the hole, so that the preheating roller 2 rotates smoothly. At the same time, a driving structure is also mounted on the frame 1, and the driving structure and the assembly shaft 203 are driven to drive the preheating roller 2 to rotate;

[0035] Please see the attached Figure 1 , Attachment Figure 3 , the driving structure can choose a matching gear box 6 and a driving motor 7, which can increase the output torque of the preheating roller 2 and reduce the load inertia of the motor, thereby improving the dynamic response and control accuracy of the drive of the preheating roller 2. The gear box 6 is fixedly mounted on the outer wall of the frame 1, and the output shaft of the gear box 6 penetrates into the frame 1 and is connected to the assembly shaft 203 by means of a transmission component. The transmission component is preferably a gear transmission, wherein a driving gear 601 coaxially set with the output shaft of the gear box 6 and a driven gear 2031 coaxially set with the assembly shaft 203 are meshed with each other, and the diameter of the driving gear 601 is smaller than the diameter of the driven gear 2031, thereby increasing the output torque of the assembly shaft 203, ensuring that the preheating roller 2 rotates smoothly, and the transmission is simple and stable, thereby ensuring reliability of use;

[0036] Please see the attached Figure 3 , Attachment Figure 5 , Attachment Figure 6The outer portion of the preheating roller 2 is provided with two circular rings 4 for sliding movement. The interior of the two circular rings 4 is hollow and provided with an induction heating coil 5. The induction heating coil 5 performs induction heating on the preheating roller 2. The two circular rings 4 are both open ring bodies 401. The induction heating coil 5 is arranged inside the ring body 401. An annular sealing cover 402 is detachably installed on the open end of the ring body 401. The sealing cover 402 is fastened to the ring body 401 by means of bolts 4021.

[0037] Please see the attached Figure 6 , a protrusion 4012 is circumferentially provided on the outer ring wall of the ring body 401. When the sealing cover 402 is tightened and fixed with the protrusion 4012 by means of bolts 4021, the outer diameter of the sealing cover 402 is larger than the outer diameter of the ring body 401, thereby providing assembly space for the bolt 4021, and a hole matching the protrusion 4012 is opened on the sealing cover 402 for assembling the bolt 4021. After the bolt 4021 is threadedly connected with the protrusion 4012, the sealing cover 402 is tightened and fixed on the ring body 401. Similarly, a sealing gasket can be provided on the sealing cover 402 or on the open end of the protrusion 4012 to ensure the sealing performance of the sealing cover 402 and the ring body 401, and reduce the entry of impurities such as dust into the ring body 401. The cable connected to the induction heating coil 5 is passed through the hole opened in the sealing cover 402, and the hole is filled with fireproof mud to seal the hole, thereby ensuring the sealing effect inside the ring body 401 and ensuring the safety of the induction heating coil 5.

[0038] Please see the attached Figure 1 , Attachment Figure 5 The ring body 401 is slidably mounted on the frame 1 with the help of a support. The support includes at least two straight rods 8 arranged on the circumferential side of the preheating roller 2. The two ends of the straight rod 8 are fixedly mounted on the frame 1 respectively. At least two lifting ears 4011 are evenly fixedly arranged on the outer ring wall of the ring body 401 along the circumferential direction. The lifting ears 4011 are slidably mounted on the straight rod 8. The straight rod 8 constrains the ring body 401 to prevent it from rotating with the preheating roller 2. By adjusting the inner diameter of the ring body 401, a gap is formed between the inner ring wall and the outer wall of the preheating roller 2 to avoid mutual interference during operation, thereby ensuring safety in use.

[0039] Please see the attached Figure 1 , Attachment Figure 6The ring body 401 utilizes the induction heating coil 5 arranged therein to induction heat the preheating roller 2, and at the same time, slides along the straight rod 8 according to the specifications of the base paper to be preheated, so as to adjust the positions of the two ring bodies 401 and the interval between the two ring bodies 401 respectively, thereby constraining the base paper and preventing it from swinging. At the same time, the ear 4011 assembled with the straight rod 8 can be locked on the straight rod 8 with the help of a locking member, so that it can constrain the base paper more firmly. The locking member can be a tightening bolt 40111, which is threadedly connected to the ear 4011 respectively. After the tightening bolt 40111 abuts against the straight rod 8, the friction force is increased, and the position of the ear 4011 is fixed. It is easy to operate and reliable to use.

[0040] The operating principle of this corrugated cardboard preheating device is as follows: Paper is guided by paper guide rollers 3 on either side of a frame 1 around preheating rollers 2 mounted within the frame 1. Once the paper is introduced into the production line, it moves along the preheating rollers 2 to be heated. After the paper passes around the preheating rollers 2, the two rings 4 on the preheating rollers 2 are adjusted in position by means of lugs 4011 along a straight rod 8. After the outer end faces of the rings 4 contact the sides of the paper, tightening bolts 40111 lock the lugs 4011 and the rings 4 in position. The rings 4 constrain the position of the paper, preventing it from swinging as it moves along the preheating rollers 2, thereby ensuring production quality. When the induction heating coils 5 within the rings 4 are connected to a power source, the preheating rollers 2 are driven to rotate. The rotating preheating rollers 2 smooth the movement of the paper, reducing wear on the paper and increasing the uniformity of the induction heating applied to the preheating rollers 2. At the same time, the heat-conducting particles filled in the preheating roller 2 absorb the heat on the preheating roller 2 and re-transmit it to the preheating roller 2 as the preheating roller 2 rolls, thereby improving the uniformity of heat distribution on the preheating roller 2, ensuring uniform heating of the paper, and ensuring the processing quality of the corrugated paper.

Claims

1. A preheating device for corrugated cardboard, characterized in that: The invention comprises a frame (1), wherein a hollow metal preheating roller (2) is rotatably mounted in the frame (1), and paper guide rollers (3) are arranged on both the front and rear sides of the preheating roller (2), and the paper guide rollers (3) are rotatably mounted on the frame (1); the preheating roller (2) is filled with heat-conducting particles, and two circular rings (4) are slidably mounted on the outside of the preheating roller (2), and the two circular rings (4) are slidably mounted on the frame (1) by means of a support member, and the interior of the two circular rings (4) is hollow and provided with an induction heating coil (5).

2. The preheating device for corrugated cardboard according to claim 1, characterized in that: The preheating roller (2) comprises a metal tube (201), both ends of the metal tube (201) are sealed and detachably assembled with a cover (202), an assembly shaft (203) is coaxially fixedly mounted on the cover (202), the assembly shaft (203) is rotatably mounted on the frame (1), and a driving structure is assembled on the frame (1), and the driving structure is drivingly connected to the assembly shaft (203).

3. The preheating device for corrugated cardboard according to claim 2, characterized in that: The driving structure comprises a matching gear box (6) and a driving motor (7); the gear box (6) is fixedly mounted on the outer wall of the frame (1); and the output shaft of the gear box (6) passes through the frame (1) and is connected to the assembly shaft (203) by means of a transmission assembly.

4. The preheating device for corrugated cardboard according to claim 3, characterized in that: The transmission assembly comprises a driven gear (2031) coaxially mounted on the assembly shaft (203) and a driving gear (601) coaxially mounted on the output shaft of the gear box (6). The diameter of the driving gear (601) is smaller than that of the driven gear (2031), and the driving gear (601) is meshed with the driven gear (2031).

5. The preheating device for corrugated cardboard according to claim 1, characterized in that: The circular ring (4) includes an open ring body (401), an induction heating coil (5) is arranged in the ring body (401), and an annular sealing cover (402) is detachably installed on the open end of the ring body (401), the sealing cover (402) is in sealing contact with the outer end surface of the ring body (401), and at least two lifting ears (4011) are evenly arranged on the outer ring wall of the ring body (401) along the circumferential direction, and the lifting ears (4011) are slidably installed with the help of a support member and a frame (1).

6. The preheating device for corrugated cardboard according to claim 5, characterized in that: The support member comprises at least two straight rods (8) arranged on the circumference of the preheating roller (2), the two ends of the straight rods (8) are respectively fixedly mounted on the frame (1), and the lifting ears (4011) are respectively slidably mounted on the straight rods (8) and locked with the straight rods (8) by means of locking members.

7. The preheating device for corrugated cardboard according to claim 6, characterized in that: The locking member comprises a tightening bolt (40111) threadedly connected to the lifting lug (4011), and the tightening bolt (40111) abuts against the straight rod (8) respectively.

8. The preheating device for corrugated cardboard according to claim 5, characterized in that: A protrusion (4012) is circumferentially provided on the outer ring wall of the ring body (401), and the diameter of the sealing cover (402) is larger than the diameter of the ring body (401). The sealing cover (402) is threadedly connected to the protrusion (4012) by means of bolts (4021).

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