Packaging material hot melting device and secondary polishing machine

Abstract

The invention relates to the technical field of packing material processing equipment, and discloses a packing material hot melting device and a secondary polishing machine, the packing material hot melting device comprises a fixed seat, a hot air gun and a heating mantle, the hot air gun is provided with an air outlet, the heating mantle comprises a shell and a flow guide piece, a heating cavity is formed in the shell, the shell is further provided with an air inlet communicated with the heating cavity, and the air inlet is communicated with the air outlet; the shell is further provided with an inlet and outlet for the packing material to enter and exit, and an exhaust pipe communicated with the heating cavity is further connected to the shell; the flow guide part is arranged in the heating cavity, a first flow channel and a second flow channel are formed between the flow guide part and the shell, the first flow channel is provided with a first heating opening, the second flow channel is provided with a second heating opening, and the first heating opening and the second heating opening are located in the two sides of the inlet-outlet in the width direction respectively. Hot air blown out of the first heating opening and the second heating opening impacts the packing material from the two sides of the packing material to heat the two sides of the packing material respectively, so that the packing material is evenly heated, secondary throwing forming is faster and more attractive, overall noise is low, energy consumption is low, and complex shapes can be formed.

Description

Technical Field

[0001] The invention relates to the technical field of packaging material processing equipment, in particular to a packaging material hot-melting device and a secondary polishing machine. Background Art

[0002] The secondary polishing machine is one of the most common machines in the cosmetics production industry. It is used to process disposable disposable tubes for medicines and cosmetics. It is widely used in cosmetics, medicines, daily necessities and chemical industries. When the secondary polishing machine processes and forms the disposable tubes, it needs to heat-melt and soften the various disposable tubes, so it needs to have the function of hot-melt structure of packaging materials.

[0003] There are two main ways to heat-melt packaging materials. One is ultrasonic heating and forming, and the other is direct blowing with a heated air knife. When using ultrasonic heating and forming, first of all, the ultrasonic wave itself is very noisy. In addition, since the ultrasonic wave itself generates heat by vibration, the air is wrapped inside the packaging material during forming. Once the air tightness is not good, the forming is easy to flatten, so it is not suitable for making complex and beautiful structures. When using a heated air knife to heat and form, because the packaging material itself has a relatively complex structure and the finished product is relatively soft, it is easy to deform by direct hot air blowing. At the same time, the packaging material will be heated unevenly, affecting the next step of operation. Summary of the invention

[0004] The purpose of the present invention is to provide a packaging material hot-melt device to solve the problems of high noise, poor aesthetics, and uneven heating of packaging materials when heating packaging materials in the secondary polishing machine in the prior art; the present invention also provides a secondary polishing machine using the packaging material hot-melt device.

[0005] In order to achieve the above-mentioned object, the present invention provides a packaging material hot-melting device, comprising a fixing seat, a hot air gun and a heating cover, wherein the hot air gun and the heating cover are movably mounted on the fixing seat in the up-down direction, and the hot air gun and the heating cover have a working position at the bottom for hot-melting the packaging material and an initial position at the top for releasing the packaging material in the up-down stroke;

[0006] The hot air gun has an air outlet, the heating cover includes a shell and a guide member, the shell is fixedly connected to the hot air gun, a heating chamber is arranged in the shell, the shell is also provided with an air inlet connected to the heating chamber, the air inlet is connected to the air outlet, the side of the shell away from the air inlet is also provided with an inlet and outlet for packaging materials to enter and exit, and the shell is also connected to an exhaust pipe connected to the heating chamber;

[0007] The guide member is arranged in the heating chamber, and a first flow channel and a second flow channel are formed between the guide member and the shell, the first flow channel and the second flow channel are respectively connected to the air inlet, the first flow channel has a first heating port, and the second flow channel has a second heating port, and the first heating port and the second heating port are respectively located on both sides of the width direction of the inlet and outlet.

[0008] Preferably, the guide member divides the heating chamber into an inner chamber and an outer chamber, the first flow channel and the second flow channel are formed in the outer chamber, the air inlet and the exhaust duct are respectively connected to the outer chamber, and the guide member is also provided with a connecting port connecting the inner chamber and the outer chamber, the connecting port and the inlet and outlet are spaced apart in the up and down directions, and the first heating port and the second heating port are both provided between the connecting port and the inlet and outlet.

[0009] Preferably, the guide member includes a main body section and an inner guide section connected to the main body section, the outer shell has an outer guide section arranged opposite to the inner guide section along the first direction, the inner guide section and the outer guide section are concave structures extending from the outer cavity to the inner cavity, the connecting port is arranged in the inner guide section, the inlet and outlet are arranged in the outer guide section, and the first heating port and the second heating port are both formed between the inner guide section and the outer guide section.

[0010] Preferably, the communicating port and the inlet and outlet are both contraction structures with a reduced diameter along the direction from the outer cavity to the inner cavity.

[0011] Preferably, the main body section is further provided with a splitter wedge, the splitter wedge faces the air inlet, and the first flow channel is connected to the second flow channel at the splitter wedge.

[0012] Preferably, it also includes a temperature detector, which is fixedly connected to the shell, and a detection end of the temperature detector is inserted into the inner cavity.

[0013] Preferably, it further comprises upper and lower movable cylinders, the upper and lower movable cylinders are fixedly connected to the fixing seat, and the heating cover is fixedly connected to the output ends of the upper and lower movable cylinders.

[0014] Preferably, the fixed seat includes a bottom plate, a top plate, a guide shaft and a fixed plate, the bottom plate and the top plate are spaced apart in the up and down directions, the guide shaft is connected between the top plate and the bottom plate, the fixed plate is slidably mounted on the guide shaft, and the upper and lower movable cylinders are fixedly connected to the fixed plate.

[0015] The present invention also provides a secondary polishing machine, comprising the packaging material hot-melting device described in any of the above technical solutions.

[0016] Compared with the prior art, the packaging material hot-melting device and the secondary polishing machine of the embodiment of the present invention have the following beneficial effects: a heating hood is connected to the air outlet of the hot air gun, a guide piece is arranged in the heating chamber of the heating hood, and a first flow channel and a second flow channel are formed between the guide piece and the heating chamber. When the packaging material is hot-melted, the hot air discharged from the air outlet of the hot air gun enters the outer shell of the heating hood through the air inlet, and then flows through the first flow channel and the second flow channel, and enters the heating chamber through the first heating port and the second heating port. Since the first heating port and the second heating port are respectively located on both sides of the width direction of the inlet and outlet, the packaging material enters the heating chamber through the inlet and outlet. At this time, the hot air blown out from the first heating port and the second heating port impacts the packaging material from both sides of the packaging material, and heats both sides of the packaging material respectively, so that the packaging material is heated evenly. By controlling the wind speed and flow rate of the hot air gun, the secondary polishing is faster and more beautiful. There is no need to use ultrasonic hot melting, the overall noise is low, the energy consumption is also low, and complex shapes can be formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the packaging material hot-melting device of the present invention;

[0018] Figure 2 yes Figure 1 A front view of a packaging material hot-melt device;

[0019] Figure 3 yes Figure 2 A longitudinal sectional view of a packaging material hot-melt device along the center line;

[0020] Figure 4 It is a schematic structural diagram of a heating cover of a packaging material hot-melting device of the present invention;

[0021] Figure 5 yes Figure 4 A schematic diagram of the structure of the outer shell of the heating cover;

[0022] Figure 6 yes Figure 4 Schematic diagram of the structure of the guide member of the heating hood.

[0023] In the figure, 1, fixed seat, 11, bottom plate, 12, top plate, 13, guide shaft, 14, fixed plate, 2, hot air gun, 21, air outlet, 3, heating cover, 31, outer shell, 311, heating chamber, 3111, inner cavity, 3112, outer cavity, 312, air inlet, 313, inlet and outlet, 314, outer guide section, 32, guide piece, 321, connecting port, 322, main body section, 3221, diverter wedge, 323, inner guide section, 4, air inlet pipe, 5, exhaust pipe, 6, first flow channel, 61, first heating port, 7, second flow channel, 71, second heating port, 8, temperature detector, 9, upper and lower movable cylinders. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] A preferred embodiment of a packaging material hot-melting device of the present invention is as follows Figures 1 to 6 As shown, the packaging material hot-melt device includes a fixing base 1, a hot air gun 2 and a heating hood 3. The fixing base 1 is used to be fixed on the basic structure of the secondary polishing machine and is the supporting basis of the packaging material hot-melt device. The hot air gun 2 has an air outlet 21. The heating hood 3 is connected to the air outlet 21 of the hot air gun 2. The hot air gun 2 is used to generate hot air and blow the hot air to the heating hood 3. The heating hood 3 is used to cover the packaging material and heat-melt and soften the packaging material by heating with high-temperature airflow.

[0026] The hot air gun 2 and the heating cover 3 are both movably assembled on the fixing seat 1 in the up-down direction. The hot air gun 2 and the heating cover 3 are fixedly connected and move synchronously in the up-down direction. In the up-down travel, when the hot air gun 2 and the heating cover 3 move to the bottom, the packaging material is hot-melted. At this time, the hot air gun 2 and the heating cover 3 are in the working position. When the hot air gun 2 and the heating cover 3 move to the top, the packaging material is separated from the heating cover 3, that is, the heating cover 3 releases the packaging material. At this time, the hot air gun 2 and the heating cover 3 are in the releasing position.

[0027] The heating cover 3 includes a shell 31 and a guide member 32. The shell 31 is fixedly connected to the hot air gun 2. A heating chamber 311 is provided in the shell 31. The heating chamber 311 is used to accommodate packaging materials and heat the packaging materials with high-temperature airflow. The shell 31 is also provided with an air inlet 312. The air inlet 312 is connected to the heating chamber 311, and the air inlet 312 of the shell 31 is connected to the air outlet 21 of the hot air gun 2. The high-temperature airflow blown out through the air outlet 21 of the hot air gun 2 enters the heating chamber 311 through the air inlet 312, and heats the packaging materials in the heating chamber 311 to soften them. In this embodiment, the top of the shell 31 is fixedly connected to the air inlet pipe 4 at the air inlet 312, and the air inlet pipe 4 is fixedly connected to the hot air gun 2, so that the air inlet 312 is connected to the air outlet 21.

[0028] The housing 31 is also fixedly connected with an exhaust pipe 5, which is in communication with the heating chamber 311. The high-temperature airflow ejected by the hot air gun 2 enters the heating chamber 311 to heat the packaging material, and then the high-temperature airflow is discharged through the exhaust pipe 5 to ensure the temperature stability in the heating chamber 311. In this embodiment, there are two groups of exhaust pipes 5, which are symmetrically arranged on both sides of the housing 31, and the two exhaust pipes 5 can increase the airflow discharge efficiency.

[0029] The side of the housing 31 away from the air inlet 312 is also provided with an inlet and outlet 313, which is connected to the heating chamber 311, and the inlet and outlet 313 is used for the packaging material to enter and exit the heating chamber 311. When heating the packaging material, the packaging material first moves to the lower side of the heating cover 3, and the hot air gun 2 and the heating cover 3 move downward from the release position to the working position, and the packaging material enters the heating chamber 311 through the inlet and outlet 313 and is heated and softened; after the packaging material is heated, the hot air gun 2 and the heating cover 3 move upward from the working position to the release position, and the packaging material is separated from the heating chamber 311, and the next packaging material is replaced, and the hot melting operation can be continued.

[0030] The guide member 32 is disposed in the heating chamber 311, and the guide member 32 is fixedly connected to the housing 31. There is a gap between the guide member 32 and the housing 31, and the gap forms a first flow channel 6 and a second flow channel 7, and the first flow channel 6 and the second flow channel 7 are respectively connected to the air inlet 312. The first flow channel 6 and the second flow channel 7 are relatively independent, and the high-temperature airflow entering the housing 31 through the air inlet 312 enters the first flow channel 6 and the second flow channel 7 respectively. The guide member 32 has a diversion effect on the high-temperature airflow, and can evenly blow the hot air onto the packaging material.

[0031] The first flow channel 6 has a first heating port 61, and the second flow channel 7 has a second heating port 71. The first heating port 61 and the second heating port 71 are respectively located on both sides of the width direction of the inlet and outlet 313. In this embodiment, the inlet and outlet 313 is a strip hole structure extending in the horizontal direction, so that each packaging material of a single-unit tube can be heated in the cavity 311 simultaneously in the vertical direction.

[0032] Since the first heating port 61 and the second heating port 71 are respectively located on both sides of the width direction of the inlet and outlet 313, when the packaging material enters the heating chamber 311 through the inlet and outlet 313, the high-temperature airflow blown out through the first heating port 61 and the high-temperature airflow blown out through the second heating port 71 on both sides of the packaging material can heat the packaging material twice at the same time, ensuring that both sides of the packaging material are evenly heated.

[0033] The packaging material hot-melting device is connected to the heating cover 3 at the air outlet 21 of the hot air gun 2, and a guide member 32 is arranged in the heating chamber 311 of the heating cover 3, and a first flow channel 6 and a second flow channel 7 are formed between the guide member 32 and the heating chamber 311. When the packaging material is hot-melted, the hot air discharged from the air outlet 21 of the hot air gun 2 enters the shell 31 of the heating cover 3 through the air inlet 312, and then flows through the first flow channel 6 and the second flow channel 7, and enters the heating chamber 311 through the first heating port 61 and the second heating port 71. Since the first heating port 61 and the second heating port 71 are respectively located on both sides of the width direction of the inlet and outlet 313, the packaging material enters the heating chamber 311 through the inlet and outlet 313. At this time, the hot air blown out from the first heating port 61 and the second heating port 71 impacts the packaging material from both sides of the packaging material, and heats both sides of the packaging material respectively, so that the packaging material is heated evenly. By controlling the wind speed and flow rate of the hot air gun 2, the first-shot molding is faster and more beautiful; there is no need to use ultrasonic hot melting, the overall noise is low, the energy consumption is also low, and complex shapes can be formed.

[0034] Preferably, the guide member 32 divides the heating chamber 311 into an inner chamber 3111 and an outer chamber 3112, the first flow channel 6 and the second flow channel 7 are formed in the outer chamber 3112, the air inlet 312 and the exhaust duct 5 are respectively connected to the outer chamber 3112, and the guide member 32 is also provided with a connecting port 321 connecting the inner chamber 3111 and the outer chamber 3112, the connecting port 321 and the inlet and outlet 313 are spaced apart in the up and down directions, and the first heating port 61 and the second heating port 71 are both provided between the connecting port 321 and the inlet and outlet 313.

[0035] The guide member 32 separates the heating chamber 311 into an inner chamber 3111 and an outer chamber 3112. The connecting port 321 of the guide member 32 and the inlet and outlet 313 of the outer shell 31 are spaced apart in the up and down directions. The packaging materials that need to be heated can pass through the outer chamber 3112 and enter the inner chamber 3111 via the inlet and outlet 313 and the connecting port 321. The high-temperature airflow blown out by the first heating port 61 and the second heating port 71 enters the inner chamber 3111 via the connecting port 321 to heat the packaging materials in the inner chamber 3111, thereby softening the packaging materials.

[0036] The first flow channel 6 and the second flow channel 7 are formed in the outer cavity 3112, and the outer cavity 3112 has the function of balancing the high-temperature airflow in the first flow channel 6 and the second flow channel 7. The space in the inner cavity 3111 is small, and the high-temperature airflow is more dense after being gathered in the inner cavity 3111, which has high heating efficiency for the packaging material and helps the subsequent mold closing and rapid molding.

[0037] Preferably, the guide member 32 includes a main body section 322 and an inner guide section 323 connected to the main body section 322, the outer shell 31 has an outer guide section 314 arranged opposite to the inner guide section 323 along a first direction, the inner guide section 323 and the outer guide section 314 are concave structures extending from the outer cavity 3112 to the inner cavity 3111, the connecting port 321 is arranged in the inner guide section 323, the inlet and outlet 313 are arranged in the outer guide section 314, and the first heating port 61 and the second heating port 71 are both formed between the inner guide section 323 and the outer guide section 314.

[0038] The inner guide section 323 of the guide member 32 and the outer guide section 314 of the outer shell 31 are arranged opposite to each other, and the interval between the inner guide section 323 and the outer guide section 314 can form the first heating port 61 and the second heating port 71 and allow the high-temperature airflow to flow. Since the inner guide section 323 and the outer guide section 314 are concave structures extending from the outer cavity 3112 to the inner cavity 3111, when the high-temperature airflow is ejected through the first heating port 61 and the second heating port 71, the inner guide section 323 and the outer guide section 314 have a guiding effect on the airflow, and the concave structure makes the airflow flow direction toward the inner cavity 3111, reducing the loss of the high-temperature airflow, reducing the overall noise and energy consumption, and improving the hot melt efficiency.

[0039] In this embodiment, the main body section 322 as a whole is an arc-shaped structure that expands toward both sides from top to bottom and contracts inward at the bottom. The first flow channel 6 and the second flow channel 7 are formed between the outer wall of the main body section 322 and the inner wall of the outer shell 31. The high-temperature airflow flows along the arc when flowing in the first flow channel 6 and the second flow channel 7, which reduces the resistance when changing direction, reduces energy consumption, and is also convenient for controlling the wind speed and flow rate of the high-temperature airflow, making the first-shot molding faster and more beautiful.

[0040] Preferably, the communication port 321 and the inlet and outlet 313 are both shrinkage structures with a decreasing diameter along the direction from the outer cavity 3112 to the inner cavity 3111 .

[0041] The connecting port 321 and the inlet and outlet 313 are both of a constricted structure. When the airflow enters the connecting port 321 through the first heating port 61 and the second heating port 71, it has a gathering effect, so that the airflow is blown onto the packaging paper more densely. The inlet and outlet 313 is of a constricted structure. When the packaging material enters the inner cavity 3111 through the inlet and outlet 313, the inlet and outlet 313 has a guiding effect on the packaging material, making it easier for the packaging material to enter the inner cavity 3111.

[0042] Preferably, the main body section 322 is further provided with a splitter wedge 3221 , the splitter wedge 3221 faces the air inlet 312 , and the first flow channel 6 is connected to the second flow channel 7 at the splitter wedge 3221 .

[0043] A diverter wedge 3221 is provided on the main section 322, facing the air inlet 312. After the high-temperature airflow blown out by the hot air gun 2 enters through the air inlet 312, it first impacts the diverter wedge 3221. The diverter wedge 3221 has the function of dispersing the high-temperature airflow, dividing the high-temperature airflow into the first flow channel 6 and the second flow channel 7, while reducing the resistance and loss of the airflow during diversion, thereby reducing energy consumption.

[0044] Preferably, it also includes a temperature detector 8, which is fixedly connected to the housing 31, and a detection end of the temperature detector 8 is inserted into the inner cavity 3111.

[0045] The temperature detector 8 can detect the temperature in the inner cavity 3111, so that the operator can obtain the temperature information during heating in real time, and it is convenient to control the heating temperature of the packaging material during the hot melt operation.

[0046] Preferably, it also includes upper and lower movable cylinders 9 , which are fixedly connected to the fixing base 1 , and the heating cover 3 is fixedly connected to the output ends of the upper and lower movable cylinders 9 .

[0047] The upper and lower movable cylinders 9 are fixedly connected to the fixed seat 1. The output ends of the upper and lower movable cylinders 9 can push the heating cover 3 to move in the up and down directions, and then drive the hot air gun 2 to rise and fall synchronously through the heating cover 3 to achieve position conversion between the working position and the release position.

[0048] Preferably, the fixed seat 1 includes a bottom plate 11, a top plate 12, a guide shaft 13 and a fixed plate 14. The bottom plate 11 and the top plate 12 are spaced apart in the up and down directions. The guide shaft 13 is connected between the top plate 12 and the bottom plate 11. The fixed plate 14 is slidably mounted on the guide shaft 13. The upper and lower movable cylinders 9 are fixedly connected to the fixed plate 14.

[0049] The bottom plate 11 is the supporting base of the fixed seat 1. The fixed seat 1 can be fixedly assembled on the secondary polishing machine through the bottom plate 11. The fixed plate 14 is slidably mounted on the guide shaft 13. When the fixed plate 14 moves along the guide shaft 13, the assembly height of the upper and lower movable cylinders 9 can be adjusted to match the heating operation of packaging materials of different specifications, and the applicability is strong.

[0050] The present invention also provides a preferred embodiment of a secondary polishing machine, comprising a packaging material hot-melt device. The specific structure of the packaging material hot-melt device is the same as the specific structure of the packaging material hot-melt device described in any of the above embodiments, and will not be repeated here.

[0051] In summary, the embodiments of the present invention provide a packaging material hot-melting device and a secondary polishing machine, which are connected to a heating hood at the air outlet of a hot air gun, a guide piece is arranged in the heating chamber of the heating hood, and a first flow channel and a second flow channel are formed between the guide piece and the heating chamber. When the packaging material is hot-melted, the hot air discharged from the air outlet of the hot air gun enters the outer shell of the heating hood through the air inlet, and then flows through the first flow channel and the second flow channel, and enters the heating chamber through the first heating port and the second heating port. Since the first heating port and the second heating port are respectively located on both sides of the width direction of the inlet and outlet, the packaging material enters the heating chamber through the inlet and outlet. At this time, the hot air blown out from the first heating port and the second heating port impacts the packaging material from both sides of the packaging material, and heats both sides of the packaging material respectively, so that the packaging material is heated evenly. By controlling the wind speed and flow rate of the hot air gun, the secondary polishing is faster and more beautiful; there is no need to use ultrasonic hot melting, the overall noise is low, the energy consumption is also low, and complex shapes can be formed.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A packaging material hot-melt device, characterized in that: The invention comprises a fixing seat (1), a hot air gun (2) and a heating cover (3), wherein the hot air gun (2) and the heating cover (3) are both movably mounted on the fixing seat (1) in the up-down direction, and the hot air gun (2) and the heating cover (3) have a working position at the bottom for hot-melting the packaging material and an initial position at the top for releasing the packaging material in the up-down travel; The hot air gun (2) has an air outlet (21), the heating cover (3) comprises an outer shell (31) and a flow guide (32), the outer shell (31) is fixedly connected to the hot air gun (2), a heating chamber (311) is provided in the outer shell (31), the outer shell (31) is also provided with an air inlet (312) communicating with the heating chamber (311), the air inlet (312) is communicated with the air outlet (21), an inlet and outlet (313) for packaging materials to enter and exit is also provided on a side of the outer shell (31) away from the air inlet (312), and an exhaust pipe (5) communicating with the heating chamber (311) is also connected to the outer shell (31); The guide member (32) is arranged in the heating chamber (311); a first flow channel (6) and a second flow channel (7) are formed between the guide member (32) and the shell (31); the first flow channel (6) and the second flow channel (7) are respectively connected to the air inlet (312); the first flow channel (6) has a first heating port (61); the second flow channel (7) has a second heating port (71); the first heating port (61) and the second heating port (71) are respectively located on both sides of the width direction of the inlet and outlet (313).

2. The packaging material hot-melt device according to claim 1, characterized in that: The flow guide (32) divides the heating chamber (311) into an inner chamber (3111) and an outer chamber (3112); the first flow channel (6) and the second flow channel (7) are formed in the outer chamber (3112); the air inlet (312) and the exhaust pipe (5) are respectively connected to the outer chamber (3112); the flow guide (32) is further provided with a connecting port (321) connecting the inner chamber (3111) and the outer chamber (3112); the connecting port (321) and the inlet and outlet (313) are arranged at intervals in the up-down direction; the first heating port (61) and the second heating port (71) are both arranged between the connecting port (321) and the inlet and outlet (313).

3. The packaging material hot-melt device according to claim 2, characterized in that: The guide member (32) comprises a main body section (322) and an inner guide section (323) connected to the main body section (322); the outer shell (31) comprises an outer guide section (314) arranged opposite to the inner guide section (323) along the first direction; the inner guide section (323) and the outer guide section (314) are concave structures extending from the outer cavity (3112) to the inner cavity (3111); the connecting port (321) is arranged on the inner guide section (323); the inlet and outlet (313) are arranged on the outer guide section (314); the first heating port (61) and the second heating port (71) are both formed between the inner guide section (323) and the outer guide section (314).

4. The packaging material hot-melt device according to claim 3, characterized in that: The communicating port (321) and the inlet and outlet (313) are both shrinking structures with a reduced diameter along the direction from the outer cavity (3112) to the inner cavity (3111).

5. The packaging material hot-melt device according to claim 3, characterized in that: The main body section (322) is also provided with a splitter wedge (3221), the splitter wedge (3221) faces the air inlet (312), and the first flow channel (6) and the second flow channel (7) are connected at the splitter wedge (3221).

6. The packaging material hot-melt device according to claim 2, characterized in that: It also includes a temperature detector (8), which is fixedly connected to the housing (31), and the detection end of the temperature detector (8) is inserted into the inner cavity (3111).

7. The packaging material hot-melt device according to any one of claims 1 to 6, characterized in that: It also comprises upper and lower movable cylinders (9), wherein the upper and lower movable cylinders (9) are fixedly connected to the fixing seat (1), and the heating cover (3) is fixedly connected to the output ends of the upper and lower movable cylinders (9).

8. The packaging material hot-melt device according to claim 7, characterized in that: The fixing seat (1) comprises a bottom plate (11), a top plate (12), a guide shaft (13) and a fixing plate (14); the bottom plate (11) and the top plate (12) are arranged at intervals in the up-down direction; the guide shaft (13) is connected between the top plate (12) and the bottom plate (11); the fixing plate (14) is slidably mounted on the guide shaft (13); and the upper and lower movable cylinders (9) are fixedly connected to the fixing plate (14).

9. A secondary polishing machine, characterized in that: The invention comprises the packaging material hot-melting device according to any one of claims 1 to 8.

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