A cigarette packet drying and lifting device for ZB28 packing machine

Abstract

The application discloses a cigarette packet drying and lifting device for a ZB28 packing machine, which comprises oppositely arranged left and right lifting mechanisms, a cigarette packet lifting channel is formed between the left and right lifting mechanisms, a groove type lifting belt is arranged on the right lifting mechanism, and a groove is arranged at the back of the groove type lifting belt; a drying device is arranged on the inner side of the right lifting mechanism, a boss type heating plate is arranged on the drying device, a boss is arranged on the side of the boss type heating plate close to the groove type lifting belt, and the boss is matched with the groove on the groove type lifting belt. The application is improved by reforming the lifting belt, the heat transfer effect of the drying belt is greatly increased, the improved boss type heating plate is used in cooperation, the drying belt is effectively prevented from being deformed and curled due to heat, the service life of the drying belt is prolonged, when the equipment is operated at high speed after being installed, the waste product rate of the trademark bottom paste is greatly reduced, and the stability of the cigarette packet quality and the effective operation rate of the equipment are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco packaging equipment technology, and in particular to a tobacco pack drying and lifting device for a ZB28 packaging machine. Background Technology

[0002] The ZB28 packaging machine is used for packaging soft-pack cigarettes. Its function is to arrange cigarettes into groups of 20 in a 7-6-7 orientation within the cigarette inlet channel. These groups are then conveyed to roller number one via a cigarette pack conveyor belt. Rollers two through four then fold and package the inner liner, label, and seal. Finally, the cigarette packs are dried, output, and any defective packs are removed in the output channel. The packs are then conveyed downstream to downstream packaging machines for small, transparent paper packaging.

[0003] In the cigarette pack output channel section of the ZB28 packaging machine, such as Figure 1 and Figure 2 As shown, the system is divided into a vertical conveyor channel A and horizontal conveyor channels B and C. In horizontal conveyor channels B and C, defective cigarette packs are removed and the final shaped cigarette packs are output, respectively. Vertical conveyor channel A is the cigarette pack drying and lifting device. Cigarette packs with sealed labels are conveyed by the movable material hopper A2 of wheel number four to the area directly below the drying and lifting device. Then, the cigarette packs are vertically pushed upwards into the device by a vertical push rod. After being pushed up, the cigarette packs are stopped by the support teeth A3 on the stop plate A1, preventing them from moving downwards. Simultaneously, the device pushes the preceding cigarette packs, eliminating gaps caused by removal, until the packs reach the conveyor belt driven by a servo motor. The side and rear walls A4 of the drying and lifting device heat the cigarette packs, completing the final drying process. Wheel number five then guides the cigarette packs into the subsequent horizontal conveyor channels B and C.

[0004] However, in actual production, cigarette packs dried by the drying and lifting device of the ZB28 packaging machine have a problem with the label paper not adhering firmly at the bottom, resulting in a high scrap rate, significant quality risks, and room for improvement in equipment efficiency and product quality stability. Observation revealed that the original equipment's drying and lifting device was ineffective in drying the cigarette packs; some packs still had undried latex on the bottom of the label paper at the outlet, which easily cracked during subsequent transport, forming defective cigarette packs with poorly adhered label paper. Analysis of the drying and lifting device's structure and operation revealed the following main reasons for the formation of these defective cigarette packs:

[0005] 1. Conveying speed factor: The faster the conveying speed of the drying lifting device, the shorter the time the tobacco packs spend passing through the drying lifting device, the worse the drying effect, and the more defective tobacco packs there will be.

[0006] 2. The appearance of the cigarette package: due to the appearance of the soft package, the four corners of the bottom of the trademark paper package have a certain supporting effect when contacting the lifting belt, and the trademark paper of the soft package is thin and soft, thereby reducing the contact area of the middle position of the bottom of the cigarette package with the lifting belt and not being well heated and dried.

[0007] 3. The lifting belt factor: the lifting belt will produce slight middle concave curl deformation due to long-term heating, resulting in a gap between the middle trademark paper glue part of the bottom of the cigarette package and the lifting belt, and the trademark paper fold of the bottom of the cigarette package is not pressed tightly, and the glue of the trademark paper of the cigarette package is glued in a point manner, and the glue is in a point structure on the trademark paper, and the glue of the bottom of the cigarette package is concentrated in the middle, if the lifting belt contacts the bottom of the cigarette package, there is a gap in the middle position of the bottom of the cigarette package, the point glue cannot be pressed tightly and spread, the trademark paper has a small bonding area, and the trademark paper is not firmly bonded.

[0008] The working temperature of the heating plate on the drying lifting device is originally set to 100 degrees Celsius, and the limit temperature of the heating plate can be set to 200 degrees Celsius, and the existing solution is to increase the heating temperature until the scrap rate decreases. But increasing the temperature will bring new problems: the lifting belt deforms and ages quickly at too high a temperature, the service life of the belt wheel bearing is shortened, so the lifting belt and the belt wheel bearing need to be replaced frequently, which seriously affects the effective operation rate of the equipment and the stability of the product quality, and after a period of use, the scrap rate increases from the above new problems. SUMMARY

[0009] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a cigarette package drying lifting device for a ZB28 packaging machine.

[0010] The present application is realized by the following technical solutions:

[0011] A cigarette package drying lifting device for a ZB28 packaging machine, comprising left and right lifting mechanisms (1) and (2) arranged opposite to each other, a cigarette package (4) lifting channel is formed between the left and right lifting mechanisms (1) and (2), and a drying device (3) is arranged on the inner side of the right lifting mechanism (2), wherein:

[0012] The right lifting mechanism (2) is provided with a groove type lifting belt (21), and a groove (211) is arranged on the back surface of the groove type lifting belt (21), the groove (211) is used to reduce the thickness of the groove type lifting belt (21) and increase the heat transfer property;

[0013] The dry device (3) is provided with a boss type heating plate (31), the boss type heating plate (31) is provided with a boss (311) near one side of the groove type lifting belt (21), the boss (311) is matched with the groove (211) on the groove type lifting belt (21), when the groove type lifting belt (21) rotates, the groove (211) slides on the boss (311), and the boss (311) is used to support the middle part of the groove type lifting belt (21).

[0014] Further, the groove (211) of the groove type lifting belt (21) is arranged with a plurality of heat transfer through holes (212).

[0015] Further, the transverse spacing and longitudinal spacing between the arranged heat transfer through holes (212) are not more than 10 mm.

[0016] Further, the width of the groove (211) is 20-25 mm.

[0017] Further, the groove type lifting belt (21) is embedded with a steel belt (213) on both sides, and the width of the steel belt (213) is less than the width of the synchronous belt teeth of the groove type lifting belt (21).

[0018] Further, the boss type heating plate (31) is provided with a chamfer (312) at both ends.

[0019] Further, the left lifting mechanism (1) and the right lifting mechanism (2) are both provided with a servo motor (12), a driving wheel (13), two pulleys (14) and two tension pulleys (15), the driving wheel (13) is coaxially arranged on the output shaft of the servo motor (12), the two pulleys (14) are arranged on the upper and lower sides of the driving wheel (13), the lifting belt (11) of the left lifting mechanism (1) and the groove type lifting belt (21) of the right lifting mechanism (2) are respectively sleeved on the driving wheel (13) and the two pulleys (14) of the two mechanisms, and the two tension pulleys (15) are respectively arranged on the upper and lower sides of the driving wheel (13), and the tension pulley (15) is in contact with the outer surface of the lifting belt (11) or the groove type lifting belt (21).

[0020] Further, the lifting belt (11) of the left lifting mechanism (1) is provided with a limiting plate (16) on the inner side, and the limiting plate (16) is attached to the inner side of the lifting belt (11) on one side close to the lifting belt (11).

[0021] Further, the dry device (3) comprises a boss type heating plate (31) and a bottom plate (32), the boss type heating plate (31) is installed on the bottom plate (32) through bolts, and the bottom plate (32) is installed on the rack of the dry lifting device on both sides.

[0022] Working principle of the invention:

[0023] This invention utilizes the synchronous belt drive of the left lifting mechanism (1) and the right lifting mechanism (2) to lift the cigarette pack (4). The left lifting mechanism (1) is used for sealing the cigarette pack, and the right lifting mechanism (2) is used for heating and drying the latex at the bottom of the cigarette pack. The right-side grooved lifting belt (21) is a synchronous belt with a groove (211) on its back. The inner side of the grooved lifting belt (21) is provided with a boss-type heating plate (31) that matches the groove (211). The boss (311) on the boss-type heating plate (31) matches the groove (211) and shortens the distance between the boss-type heating plate (31) and the bottom of the cigarette pack (4), enhancing the heat transfer effect. During the drying and lifting process of the cigarette pack (4), the lifting belt (11) and the grooved lifting belt (21) are driven independently by two servo motors (12), and the equipment program controls the synchronous movement. The tobacco pack (4) is dried and lifted upwards. During the conveying process, the raised heating plate (31) is energized and heats up. The heat passes through the grooved lifting belt (21) and the heat transfer holes (212) on the grooved lifting belt (21) to heat and dry the bottom of the tobacco pack (4). The grooved lifting belt (21) is made thinner in the middle by opening grooves (211), which enhances the heat transfer performance in the middle of the grooved lifting belt (21). The heat transfer holes (212) are set in the grooves (211) so that the heat can be directly transferred from the heat transfer holes (212) to the bottom of the tobacco pack (4), reducing heat loss.

[0024] The advantages of this invention compared to the prior art are:

[0025] 1. The present invention transforms the original drying conveyor belt into a grooved and perforated grooved conveyor belt (21). A groove (211) is opened in the middle of the back of the grooved conveyor belt (21), which makes the thickness of the middle part of the grooved conveyor belt (21) thinner, while the heat transfer effect is greatly increased through the heat transfer through hole (212), the number of cigarette packs that are not firmly attached at the bottom is effectively reduced, and the scrap rate is greatly reduced.

[0026] 2. Due to the significantly improved heat transfer effect, the equipment can maintain product quality stability even when running at high speed.

[0027] 3. Modify the heating plate into a raised platform heating plate (31) to add a support surface to the middle part of the lifting belt, so that the bottom of the cigarette pack can contact the middle part of the lifting belt and be effectively dried.

[0028] 4. The raised heating plate (31) supports the middle position of the grooved lifting belt (21), effectively improving the concave deformation and curling caused by the heating of the lifting belt, so that the middle position of the grooved lifting belt (21) can press down the bottom of the tobacco pack (4).

[0029] 5. A steel belt (213) is installed inside the trough-type lifting belt (21), which enhances the structural strength of the trough-type lifting belt (21) and reduces the deformation of the trough-type lifting belt (21), thereby extending the service life of the trough-type lifting belt (21).

[0030] 6. Equipment maintenance rate is reduced, and effective operation rate is increased. Attached Figure Description

[0031] Figure 1 This is a schematic diagram showing the location of the tobacco pack drying and lifting channel on the ZB28 packaging machine in the prior art.

[0032] Figure 2 This is a schematic diagram of the feed inlet of the tobacco pack drying and lifting channel in the prior art;

[0033] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0034] Figure 4 This is a front view of the present invention;

[0035] Figure 5 For the present invention Figure 4 Cross-sectional view at point AA;

[0036] Figure 6 For the present invention Figure 5 A magnified view of a section at point B in the middle;

[0037] Figure 7 This is a schematic diagram illustrating the cooperation between the grooved lifting belt and the boss-type heating plate of the present invention.

[0038] Figure 8 This is a schematic diagram of the front and back sides of the original lifting belt of the ZB28 packaging machine.

[0039] Figure 9 This is a schematic diagram of the front and back sides of the grooved lifting belt of the present invention;

[0040] Figure 10 A schematic diagram of the front and back of the original heating plate of the ZB28 packaging machine;

[0041] Figure 11 This is a schematic diagram of the front and back sides of the boss-type heating plate of the present invention.

[0042] Numbering on the map:

[0043] 1-Left side lifting mechanism, 11-Lifting belt, 12-Servo motor, 13-Drive wheel, 14-Pulley, 15-Tension wheel, 16-Limit plate;

[0044] 2-Right side lifting mechanism, 21-Trough-type lifting belt, 211-Groove, 212-Heat transfer through hole, 213-Steel belt;

[0045] 3-Drying device; 31-Protruding heating plate; 311-Protrusion; 312-Chamfer; 32-Base plate; 4-Smoke pack. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solution of the present invention, the specific embodiments are described in detail below with reference to the accompanying drawings.

[0047] like Figures 3-7 , Figure 9 , Figure 11 As shown, a cigarette pack drying and lifting device for a ZB28 packaging machine includes a left lifting mechanism 1 and a right lifting mechanism 2 arranged opposite to each other, forming a cigarette pack 4 lifting channel between the left lifting mechanism 1 and the right lifting mechanism 2. A grooved lifting belt 21 is provided on the right lifting mechanism 2, and a groove 211 is provided in the center of the back of the grooved lifting belt 21. A drying device 3 is provided inside the right lifting mechanism 2, and a boss-type heating plate 31 is provided on the drying device 3. A boss 311 is provided on the side of the boss-type heating plate 31 near the grooved lifting belt 21. The boss 311 is adapted to the groove 211 on the grooved lifting belt 21. When the grooved lifting belt 21 rotates, the groove 211 slides on the boss 311.

[0048] In some embodiments, such as Figure 7 , Figure 9 As shown, a number of heat transfer holes 212 are arranged in the groove 211 of the trough-type lifting belt 21 to enhance the heat transfer of the middle part of the trough-type lifting belt 21 and improve the drying effect of the latex at the bottom of the cigarette pack 4.

[0049] In some embodiments, the groove 211 has a groove depth of about 3.6 mm and a groove width of about 22 mm.

[0050] In some embodiments, the lateral and longitudinal spacing between the arranged heat transfer holes 212 does not exceed 10 mm, and the heat transfer holes 212 are used to directly transfer the heat generated by the boss-type heating plate 31.

[0051] In some embodiments, the width of the groove 211 is in the range of 20-25mm. If the width of the groove 211 is too small, the area of ​​the latex at the bottom of the cigarette pack 4 after passing through the drying lifting device will be small, and the latex will be easily not firmly bonded due to the small bonding surface. If the width of the groove 211 is too large, the contact surface between the two sides of the grooved lifting belt 21 and the pulley 14 will be too small, affecting the transmission of the grooved lifting belt 21. The excessive width of the groove 211 will also affect the structural strength of the grooved lifting belt 21.

[0052] In some embodiments, the groove 211 is used to reduce the thickness of the middle part of the grooved lifting belt 21 to increase heat transfer.

[0053] In some embodiments, such asFigure 4 , Figure 5 As shown, steel strips 213 are embedded on both sides of the trough-type lifting belt 21. The width of the steel strips 213 is smaller than the width of the synchronous belt teeth of the trough-type lifting belt 21, ensuring that the steel strips 213 are not exposed after being embedded in the trough-type lifting belt 21. The steel strips 213 are used to enhance the structural strength of the trough-type lifting belt 21 and extend the service life of the trough-type lifting belt 21 after grooving. The steel strips 213 are made of steel with good elasticity, high toughness and good wear resistance.

[0054] In some embodiments, such as Figure 11 As shown, the raised heating plate 31 has chamfers 312 at both ends. The chamfers 312 are used to transition the contact between the two ends of the raised heating plate 31 and the grooved lifting belt 21, and to prevent the grooved lifting belt 21 from getting stuck on the edges of the raised heating plate 31 when it rotates, which would reduce the service life of the grooved lifting belt 21. The two lifting belts may shake off the cigarette pack 4 or even damage it due to the positional difference caused by the jamming.

[0055] In some embodiments, such as Figure 5 , Figure 6 As shown, the boss 311 is used to support the middle part of the grooved lifting belt 21. The boss 311 presses the middle part of the grooved lifting belt 21 against the label paper fold at the bottom of the cigarette pack 4 to prevent the middle part of the grooved lifting belt 21 from deforming due to heat. There is a gap between the lifting belt and the bottom of the cigarette pack 4, and the label paper fold at the bottom of the cigarette pack 4 is not pressed tightly, resulting in unreliable latex adhesion.

[0056] In some embodiments, such as Figure 3 , Figure 4 As shown, both the left lifting mechanism 1 and the right lifting mechanism 2 include: a servo motor 12, a drive wheel 13, two pulleys 14, and two tensioning wheels 15. The drive wheel 13 is coaxially mounted on the output shaft of the servo motor 12. The two pulleys 14 are respectively positioned above and below the drive wheel 13. The lifting belt 11 of the left lifting mechanism 1 and the grooved lifting belt 21 of the right lifting mechanism 2 are respectively sleeved on the drive wheel 13 and the two pulleys 14 of the two mechanisms. The two tensioning wheels 15 are respectively positioned above and below the drive wheel 13. The tensioning wheels 15 are in contact with the outer surface of the lifting belt 11 or the grooved lifting belt 21. The tensioning wheels 15 are used to tighten the lifting belt 11 and the grooved lifting belt 21 to prevent the lifting belt 11 and the grooved lifting belt 21 from loosening and making it difficult to clamp the cigarette pack 4.

[0057] In some embodiments, such as Figure 3 , Figure 4 As shown, the drive pulley 13 and pulley 14 are synchronous pulleys, and the lifting belt 11 and grooved lifting belt 21 are synchronous belts. The transmission ratio of the synchronous belt drive is accurate, there is no slippage, and the force on the shaft is small.

[0058] In some embodiments, such as Figure 3 ,Figure 4 As shown, a limiting plate 16 is provided on the inner side of the lifting belt 11 of the left lifting mechanism 1. The side of the limiting plate 16 close to the lifting belt 11 is attached to the inner side of the lifting belt 11. The limiting plate 16 is used to limit the lifting belt 11 to prevent the lifting belt 11 from deforming and opening, which would increase the width of the lifting channel of the cigarette pack 4 and prevent the cigarette pack 4 from being clamped and lifted.

[0059] In some embodiments, such as Figure 5 As shown, the drying device 3 includes a boss-type heating plate 31 and a base plate 32. The base plate 32 is used to fix the boss-type heating plate 31. The boss-type heating plate 31 is installed on the base plate 32 by bolts. The two sides of the base plate 32 are installed on the frame of the drying lifting device.

[0060] In some embodiments, such as Figure 3 , Figure 4 As shown, both the lifting belt 11 and the trough lifting belt 21 are driven independently by two servo motors 12. The two servo motors 12 move synchronously under the control of the equipment program to dry and lift the cigarette packs upwards. The left lifting belt 11 is used to compress and seal the cigarette packs, while the right trough lifting belt 21 is used to heat and shape the latex at the bottom of the cigarette packs.

[0061] In some embodiments, the original operating temperature of the heating plate on the drying lifting device was set to 100 degrees Celsius. Before improvements to the drying lifting device, the scrap rate was reduced by increasing the operating temperature of the heating plate. This invention enhances the drying efficiency of the drying lifting device by shortening the distance between the raised heating plate 31 and the bottom of the cigarette pack 4, reducing the thickness of the middle section of the trough-type lifting belt 21, and providing heat transfer holes 212 in the groove 211 of the trough-type lifting belt 21. When actually applied to the drying lifting device of the ZB28 packaging machine, the operating temperature of the raised heating plate 31 can be lowered to 75 degrees Celsius. While reducing the scrap rate of the cigarette pack 4, the operating temperature of the raised heating plate 31 is lower than before the improvement, thus improving the stability of product quality while maintaining an effective operating rate.

[0062] How this invention works:

[0063] During operation, the cigarette pack 4 is first pushed vertically upwards from the No. 4 wheel of the ZB28 packaging machine into the cigarette pack conveying channel of the cigarette pack drying and lifting device by the vertical push rod. After the cigarette pack 4 enters the cigarette pack conveying channel, the lifting belt 11 on the left side of the cigarette pack conveying channel is close to the sealing end of the cigarette pack 4, and the trough-type lifting belt 21 on the right side of the cigarette pack conveying channel is close to the bottom of the cigarette pack 4. The label paper bonding surface on one side of the cigarette pack 4 is close to the original rear wall heating plate of the ZB28 packaging machine drying and lifting device. The lifting belt 11 and the trough-type lifting belt 21 rotate synchronously and clamp the cigarette pack 4 to move upwards. When the cigarette pack 4 is lifted past the raised platform heating plate 31, the raised platform heating plate 31 supports the middle of the grooved lifting belt 21 to press the label paper fold at the bottom of the cigarette pack 4. At the same time, the heat generated by the energized raised platform heating plate 31 passes through the grooved lifting belt 21 and the heat transfer holes 212 on the grooved lifting belt 21 to heat and dry the bottom of the cigarette pack 4. The original rear wall heating plate of the drying lifting device heats and dries the label paper bonding surface on one side of the cigarette pack 4 until the cigarette pack 4 is lifted to the top of the drying lifting device, completing the final drying of the cigarette pack. The cigarette pack is then pushed into the subsequent horizontal conveying channels B and C by the No. 5 wheel.

[0064] It should be noted that the technical solution of the present invention has been described in detail above, and the principle of the present invention has been described. The above description of the working principle is only for the purpose of helping to understand the core idea of ​​the present invention. It should be pointed out that for those skilled in the art, improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0065] Modifications, additions, or similar substitutions made to the described specific embodiments by those skilled in the art to which this invention pertains, as long as they do not depart from the structure of this invention or exceed the scope defined by these claims, shall all fall within the protection scope of this invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A cigarette pack drying and lifting device for a ZB28 packaging machine, comprising a left lifting mechanism (1) and a right lifting mechanism (2) arranged opposite to each other, forming a cigarette pack (4) lifting channel between the left lifting mechanism (1) and the right lifting mechanism (2), and a drying device (3) provided inside the right lifting mechanism (2), characterized in that: The right-side lifting mechanism (2) is provided with a grooved lifting belt (21), and a groove (211) is provided in the center of the back side of the grooved lifting belt (21). The groove (211) is used to reduce the thickness of the middle part of the grooved lifting belt (21) and increase the heat transfer. The drying device (3) is provided with a boss-type heating plate (31). The boss-type heating plate (31) has a boss (311) on the side near the trough-type lifting belt (21). The boss (311) is adapted to the groove (211) on the trough-type lifting belt (21). When the trough-type lifting belt (21) rotates, the groove (211) slides on the boss (311). The boss (311) is used to support the middle part of the trough-type lifting belt (21). The groove (211) of the grooved lifting belt (21) is provided with a number of heat transfer holes (212). Steel strips (213) are embedded on both sides of the trough-type lifting belt (21).

2. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 1, characterized in that: The lateral and longitudinal spacing between the arranged heat transfer holes (212) does not exceed 10 mm.

3. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 1, characterized in that: The width of the groove (211) is in the range of 20-25mm.

4. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 1, characterized in that: The width of the steel belt (213) is less than the width of the synchronous belt teeth of the grooved lifting belt (21).

5. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 1, characterized in that: The raised heating plate (31) has chamfers (312) at both ends.

6. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 1, characterized in that: The left lifting mechanism (1) and the right lifting mechanism (2) both include: a servo motor (12), a drive wheel (13), two pulleys (14) and two tensioning wheels (15). The drive wheel (13) is coaxially mounted on the output shaft of the servo motor (12). The two pulleys (14) are respectively mounted on the upper and lower sides of the drive wheel (13). The lifting belt (11) of the left lifting mechanism (1) and the grooved lifting belt (21) of the right lifting mechanism (2) are respectively mounted on the drive wheel (13) and the two pulleys (14) of the two mechanisms. The two tensioning wheels (15) are respectively mounted on the upper and lower sides of the drive wheel (13). The tensioning wheels (15) are in contact with the outer surface of the lifting belt (11) or the grooved lifting belt (21).

7. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 6, characterized in that: A limiting plate (16) is provided on the inner side of the lifting belt (11) of the left lifting mechanism (1), and the side of the limiting plate (16) close to the lifting belt (11) is attached to the inner side of the lifting belt (11).

8. The cigarette pack drying and lifting device for a ZB28 packaging machine according to claim 1, characterized in that: The drying device (3) includes a boss-type heating plate (31) and a base plate (32). The boss-type heating plate (31) is mounted on the base plate (32) by bolts, and the two sides of the base plate (32) are mounted on the frame of the drying lifting device.

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