A kind of wrapping material hot melting device and secondary throwing machine

Abstract

The present application relates to the technical field of packaging material processing equipment, and discloses a packaging material hot melting device and a secondary throwing machine, which comprise a fixing seat, a hot air gun and a heating cover. The hot air gun has an air outlet. The heating cover comprises a shell and a flow guide piece. A heating cavity is arranged in the shell. The shell is also provided with an air inlet which is in communication with the heating cavity. The air inlet is in communication with the air outlet. The shell is also provided with an import and export port for the packaging material. An exhaust pipe which is in communication with the heating cavity is connected to the shell. The flow guide piece is arranged in the heating cavity. First and second flow channels are formed between the flow guide piece and the shell. The first flow channel has a first heating port, and the second flow channel has a second heating port. The first and second heating ports are respectively located on the two sides of the import and export port in the width direction. The hot air blown out by the first and second heating ports impacts the packaging material from the two sides of the packaging material, and the two sides of the packaging material are heated respectively, so that the packaging material is uniformly heated, the secondary throwing is faster and more beautiful, the overall noise is small, the energy consumption is also small, and complex shapes can be formed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging material processing equipment, in particular to a packaging material hot melting device and a secondary molding machine. BACKGROUND

[0002] The secondary molding machine is one of the machines commonly used in the cosmetic production industry, which is used for processing and forming disposable secondary molding tubes for medicines, cosmetics, daily necessities and chemical products. The secondary molding machine is widely used in the fields of cosmetics, medicines, daily necessities and chemical products. When the secondary molding machine processes and forms the secondary molding tube, it needs to heat and soften various secondary molding tubes, so it needs to have a packaging material hot melting structure function.

[0003] The existing methods for hot melting of packaging materials mainly include two types: one is ultrasonic heating forming, and the other is directly blowing air with a heated air knife. When using ultrasonic heating forming, the noise of the ultrasonic wave itself is very large, and because the ultrasonic wave itself generates heat by vibration, air is trapped in the packaging material during forming. If the air tightness is not good, the formed product is prone to be flat, so it is not suitable for complex and beautiful structures. When using a heated air knife to form, because the packaging material itself has a relatively complex structure, the finished product is relatively soft, and direct blowing of hot air can easily deform the product, and the packaging material can be unevenly heated, affecting the next operation. SUMMARY

[0004] The purpose of the present application is to provide a packaging material hot melting device to solve the problems of loud noise, poor appearance and uneven heating of the packaging material when the secondary molding machine in the prior art heats the packaging material. The present application also provides a secondary molding machine using the packaging material hot melting device.

[0005] In order to achieve the above purpose, the present application provides a packaging material hot melting device, which comprises a fixed seat, a hot air gun and a heating cover, the hot air gun and the heating cover are movably assembled on the fixed 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 of 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 flow guide, the shell is fixedly connected with the hot air gun, a heating cavity is arranged in the shell, the shell is further provided with an air inlet communicated with the heating cavity, the air inlet is communicated with the air outlet, the shell is further provided with an import and export on the side away from the air inlet for the packaging material to enter and exit, and a exhaust pipe communicated with the heating cavity is further connected to the shell;

[0007] The flow guide is arranged in the heating cavity, and the flow guide and the shell form a first flow channel and a second flow channel, the first flow channel and the second flow channel are communicated with the air inlet respectively, the first flow channel has a first heating port, the second flow channel has a second heating port, and the first heating port and the second heating port are located on both sides of the inlet and outlet in the width direction respectively.

[0008] Preferably, the flow guide separates the heating cavity into an inner cavity and an outer cavity, the first flow channel and the second flow channel are formed in the outer cavity, the air inlet and the air outlet are communicated with the outer cavity respectively, the flow guide is further provided with a communication port communicating the inner cavity and the outer cavity, the communication port and the inlet and outlet are arranged in the up-down direction, and the first heating port and the second heating port are arranged between the communication port and the inlet and outlet.

[0009] Preferably, the flow guide comprises a main body segment and an inner flow guide segment connected with the main body segment, the shell has an outer flow guide segment arranged opposite to the inner flow guide segment in the first direction, the inner flow guide segment and the outer flow guide segment are concave structures extending from the outer cavity to the inner cavity, the communication port is arranged in the inner flow guide segment, the inlet and outlet are arranged in the outer flow guide segment, and the first heating port and the second heating port are formed between the inner flow guide segment and the outer flow guide segment.

[0010] Preferably, the communication port and the inlet and outlet are both reduced in diameter in the direction from the outer cavity to the inner cavity.

[0011] Preferably, the main body segment is further provided with a flow splitting wedge, the flow splitting wedge faces the air inlet, and the first flow channel and the second flow channel are communicated at the flow splitting wedge.

[0012] Preferably, a temperature detector is further included, the temperature detector is fixedly connected with the shell, and a detection end of the temperature detector is inserted into the inner cavity.

[0013] Preferably, an up-down movable air cylinder is further included, the up-down movable air cylinder is fixedly connected with the fixed seat, and the heating cover is fixedly connected with an output end of the up-down movable air cylinder.

[0014] Preferably, the fixed seat comprises a bottom plate, a top plate, a guide shaft and a fixed plate, the bottom plate and the top plate are arranged in the up-down direction, the guide shaft is connected between the top plate and the bottom plate, the fixed plate is slidingly sleeved on the guide shaft, and the up-down movable air cylinder is fixedly connected with the fixed plate.

[0015] The application further provides a secondary polishing machine comprising the packaging material hot melting device.

[0016] Compared with the prior art, the package material hot melting device and the secondary throwing machine have the beneficial effects that: the heating cover is connected at the air outlet of the hot air gun, the flow guide member is arranged in the heating cavity of the heating cover, the first flow channel and the second flow channel are formed between the flow guide member and the heating cavity, when the package material is hot melted, the hot air discharged from the air outlet of the hot air gun enters the shell of the heating cover through the air inlet, and then flows through the first flow channel and the second flow channel and enters the heating cavity through the first heating port and the second heating port, since the first heating port and the second heating port are respectively located on the two sides of the width direction of the inlet and outlet, the package material enters the heating cavity through the inlet and outlet, at this time, the hot air blown from the first heating port and the second heating port impacts the package material from the two sides of the package material, the two sides of the package material are heated respectively, the package material is uniformly heated, the air speed and flow of the hot air gun are controlled, the secondary throwing is more rapid and beautiful, ultrasonic hot melting is not needed, the overall noise is small, the energy consumption is small, and complex shapes can be formed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective structural schematic view of the package material hot melting device of the present application;

[0018] Figure 2 is a front view of the package material hot melting device of Figure 1 ;

[0019] Figure 3 is a longitudinal sectional view of the package material hot melting device of Figure 2 along the center line;

[0020] Figure 4 is a structural schematic view of the heating cover of the package material hot melting device of the present application;

[0021] Figure 5 is a structural schematic view of the shell of the heating cover of Figure 4 ;

[0022] Figure 6 is a structural schematic view of the flow guide member of the heating cover of Figure 4 .

[0023] In the figure, 1 is a fixed seat, 11 is a bottom plate, 12 is a top plate, 13 is a guide shaft, 14 is a fixed plate, 2 is a hot air gun, 21 is an air outlet, 3 is a heating cover, 31 is a shell, 311 is a heating cavity, 3111 is an inner cavity, 3112 is an outer cavity, 312 is an air inlet, 313 is an inlet and outlet, 314 is an outer flow guide section, 32 is a flow guide member, 321 is a communication port, 322 is a main body section, 3221 is a flow splitting wedge, 323 is an inner flow guide section, 4 is an air inlet pipe, 5 is an air outlet pipe, 6 is a first flow channel, 61 is a first heating port, 7 is a second flow channel, 71 is a second heating port, 8 is a temperature detector, and 9 is an up-down movable air cylinder. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0025] A preferred embodiment of a packaging material hot melting device of the present application is shown in Figures 1 to 6 The packaging material hot melting device comprises a fixing base 1, a hot air gun 2 and a heating cover 3. The fixing base 1 is used to be fixed on the base structure of a secondary polishing machine, which is the support base of the packaging material hot melting device. The hot air gun 2 has an air outlet 21. The heating cover 3 is in communication with 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 cover 3. The heating cover 3 is used to cover the packaging material and heat melt the packaging material by the way of high-temperature airflow.

[0026] The hot air gun 2 and the heating cover 3 are movably assembled on the fixing base 1 along the up-down direction. The hot air gun 2 and the heating cover 3 are fixedly connected and synchronously move along the up-down direction. In the up-down stroke, when the hot air gun 2 and the heating cover 3 move to the bottom, the hot melting operation is performed on the packaging material. 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 release position.

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

[0028] The outer shell 31 is also fixedly connected with an air outlet pipe 5. The air outlet pipe 5 is in communication with the heating cavity 311. After the high-temperature airflow emitted by the hot air gun 2 heats the packaging material in the heating cavity 311, the high-temperature airflow is then discharged through the air outlet pipe 5, so as to ensure the temperature stability in the heating cavity 311. In this embodiment, the air outlet pipe 5 has two groups. The two air outlet pipes 5 are symmetrically arranged on both sides of the outer shell 31. The two air outlet pipes 5 can increase the airflow discharge efficiency.

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

[0030] The flow guide 32 is arranged in the heating cavity 311, and the flow guide 32 is fixedly connected with the shell 31, and the flow guide 32 and the shell 31 have a gap therebetween, 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 respectively communicate with the air inlet 312. The first flow channel 6 and the second flow channel 7 are relatively independent, and the high-temperature gas entering the shell 31 through the air inlet 312 respectively enters the first flow channel 6 and the second flow channel 7, and the flow guide 32 has a shunt effect on the high-temperature gas, and can uniformly blow the hot air to the package 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, and 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 package material of the single connection secondary throwing pipe is simultaneously heated in the heating cavity 311 in the up-down 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 package material enters the heating cavity 311 through the inlet and outlet 313, the high-temperature gas blown out through the first heating port 61 and the high-temperature gas blown out through the second heating port 71 are located on both sides of the package material, so that the package material can be heated on both sides at the same time, and uniform heating of both sides of the package material is ensured.

[0033] The package material hot melting device is connected with the heating cover 3 at the air outlet 21 of the hot air gun 2, the flow guide 32 is arranged in the heating cavity 311 of the heating cover 3, and the first flow channel 6 and the second flow channel 7 are formed between the flow guide 32 and the heating cavity 311. When the package 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 cavity 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 package material enters the heating cavity 311 through the inlet and outlet 313, at this time, the hot air blown from the first heating port 61 and the second heating port 71 impacts the package material from both sides of the package material, and the two sides of the package material are heated respectively, so that the package material is uniformly heated. By controlling the air speed and flow of the hot air gun 2, the secondary blow molding is more rapid and beautiful. Without using ultrasonic hot melting, the overall noise is small, the energy consumption is also small, and complex shapes can be formed.

[0034] Preferably, the flow guide 32 divides the heating cavity 311 into an inner cavity 3111 and an outer cavity 3112, the first flow channel 6 and the second flow channel 7 are formed in the outer cavity 3112, the air inlet 312 and the exhaust pipe 5 are respectively communicated with the outer cavity 3112, the flow guide 32 is further provided with a communication port 321 communicating the inner cavity 3111 and the outer cavity 3112, the communication port 321 and the inlet and outlet 313 are spaced apart in the up-down direction, and the first heating port 61 and the second heating port 71 are both arranged between the communication port 321 and the inlet and outlet 313.

[0035] The flow guide 32 divides the heating cavity 311 into an inner cavity 3111 and an outer cavity 3112, the communication port 321 of the flow guide 32 and the inlet and outlet 313 of the shell 31 are spaced apart in the up-down direction, and the package material to be heated can pass through the outer cavity 3112 and enter the inner cavity 3111 through the inlet and outlet 313 and the communication port 321. The high-temperature airflow blown by the first heating port 61 and the second heating port 71 enters the inner cavity 3111 through the communication port 321, and heats the package material in the inner cavity 3111, so that the package material softens.

[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 concentrated after converging in the inner cavity 3111, so that the heating efficiency of the package material is high, and the subsequent mold closing is rapidly formed.

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

[0038] The inner flow guide section 323 of the flow guide 32 and the outer flow guide section 314 of the outer shell 31 are arranged opposite to each other, and the space between the inner flow guide section 323 and the outer flow guide section 314 can form the first heating port 61 and the second heating port 71 and provide a flow path for the high-temperature gas flow. Since the inner flow guide section 323 and the outer flow guide section 314 are concave structures extending from the outer cavity 3112 to the inner cavity 3111, the inner flow guide section 323 and the outer flow guide section 314 have a guiding effect on the gas flow when the high-temperature gas flow is sprayed through the first heating port 61 and the second heating port 71. The concave structure makes the flow direction of the gas flow towards the inner cavity 3111, reduces the loss of high-temperature gas flow, and reduces the overall noise and energy consumption, thereby improving the hot melting efficiency.

[0039] In the embodiment, the main body section 322 is an arc-shaped structure that expands to both sides first and then shrinks inward at the bottom from top to 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, and the high-temperature gas flow flows along the arc line in the first flow channel 6 and the second flow channel 7, thereby reducing the resistance when changing the direction and reducing the energy consumption. It is also convenient to control the wind speed and flow of the high-temperature gas flow, so that the secondary blow molding is faster and more beautiful.

[0040] Preferably, the communication port 321 and the inlet and outlet port 313 are both reduced in diameter in the direction from the outer cavity 3112 to the inner cavity 3111.

[0041] The communication port 321 and the inlet and outlet port 313 are both reduced in diameter in the direction from the outer cavity 3112 to the inner cavity 3111.

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

[0043] The main body section 322 is provided with a flow splitting wedge 3221 facing the air inlet 312, and the high-temperature airflow blown by the hot air gun 2 enters the flow splitting wedge 3221 first after entering through the air inlet 312, the flow splitting wedge 3221 has the effect of dispersing the high-temperature airflow, and the high-temperature airflow is divided into the first flow channel 6 and the second flow channel 7, while reducing the resistance and loss of the airflow during flow splitting, and reducing energy consumption.

[0044] Preferably, a temperature detector 8 is further included, the temperature detector 8 is fixedly connected with the shell 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 in real time during heating, and the heating temperature of the packaging material during hot melting operation can be controlled.

[0046] Preferably, an up-down movable cylinder 9 is further included, the up-down movable cylinder 9 is fixedly connected with the fixed seat 1, and the heating cover 3 is fixedly connected with an output end of the up-down movable cylinder 9.

[0047] The up-down movable cylinder 9 is fixedly connected with the fixed seat 1, and the output end of the up-down movable cylinder 9 can drive the heating cover 3 to move in the up-down direction, so that the hot air gun 2 is driven to move up and down synchronously through the heating cover 3, and the position conversion between the working position and the releasing position is realized.

[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 arranged in a spaced apart manner in the up-down direction, the guide shaft 13 is connected between the top plate 12 and the bottom plate 11, the fixed plate 14 is slidingly sleeved on the guide shaft 13, and the up-down movable cylinder 9 is fixedly connected with the fixed plate 14.

[0049] The bottom plate 11 is a support 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 slidingly sleeved on the guide shaft 13, and when the fixed plate 14 moves along the guide shaft 13, the assembly height of the up-down movable cylinder 9 can be adjusted, the heating operation of different specifications of packaging materials can be matched, and the applicability is strong.

[0050] The application further provides a preferred embodiment of a secondary polishing machine, which comprises a packaging material hot melting device, and the specific structure of the packaging material hot melting device is the same as that of any of the above-mentioned embodiments, which is not repeated here.

[0051] In summary, the embodiment of the present application provides a kind of package material hot melting device and secondary throwing machine, heating cover is connected at the air outlet of hot air gun, flow guide piece is arranged in the heating cavity of heating cover, and first flow channel and second flow channel are formed between flow guide piece and heating cavity, when package material is hot melted, hot air discharged by the air outlet of hot air gun enters the shell of heating cover through air inlet, then air flow is carried out by first flow channel and second flow channel, and enters heating cavity through first heating port and second heating port, since first heating port and second heating port are respectively located at the two sides of width direction of inlet and outlet, package material enters heating cavity through inlet and outlet, at this time, hot air blown by first heating port and second heating port impacts package material from the two sides of package material, heats the two sides of package material respectively, so that package material is evenly heated, by controlling the air speed and flow of hot air gun, secondary throwing is more rapid and beautiful;Without using ultrasonic hot melting, overall noise is small, energy consumption is also small, complex shape can be formed.

[0052] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A packaging material hot-melt device, characterized in that, Includes a fixed base (1), a hot air gun (2) and a heating cover (3). The hot air gun (2) and the heating cover (3) are both movably mounted on the fixed base (1) in the vertical direction. The hot air gun (2) and the heating cover (3) have a working position at the bottom for heat-melting the packaging material and an initial position at the top for releasing the packaging material during the vertical stroke. The hot air gun (2) has an air outlet (21). The heating cover (3) includes a shell (31) and a guide (32). The shell (31) is fixedly connected to the hot air gun (2). The shell (31) is provided with a heating chamber (311). The shell (31) is also provided with an air inlet (312) that communicates with the heating chamber (311). The air inlet (312) communicates with the air outlet (21). The side of the shell (31) away from the air inlet (312) is also provided with an inlet and outlet (313) for packaging materials to enter and exit. The shell (31) is also connected with an exhaust pipe (5) that communicates with the heating chamber (311). The flow guide (32) is disposed in the heating cavity (311). A first flow channel (6) and a second flow channel (7) are formed between the flow guide (32) and the outer 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), 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). The flow guide (32) divides the heating chamber (311) into an inner cavity (3111) and an outer cavity (3112). The first flow channel (6) and the second flow channel (7) are formed in the outer cavity (3112). The air inlet (312) and the exhaust pipe (5) are respectively connected to the outer cavity (3112). The flow guide (32) is also provided with a connecting port (321) connecting the inner cavity (3111) and the outer cavity (3112). The connecting port (321) and the inlet and outlet (313) are spaced apart in the vertical direction. The first heating port (61) and the second heating port (71) are both located between the connecting port (321) and the inlet and outlet (313).

2. The packaging material hot-melt apparatus according to claim 1, characterized in that, The flow guide (32) includes a main body section (322) and an inner flow guide section (323) connected to the main body section (322). The outer shell (31) has an outer flow guide section (314) that is disposed opposite to the inner flow guide section (323) in a first direction. The inner flow guide section (323) and the outer flow guide section (314) are concave structures extending from the outer cavity (3112) to the inner cavity (3111). The communication port (321) is disposed in the inner flow guide section (323), and the inlet and outlet (313) are disposed in the outer flow guide section (314). The first heating port (61) and the second heating port (71) are both formed between the inner flow guide section (323) and the outer flow guide section (314).

3. The packaging material hot-melt apparatus according to claim 2, characterized in that, Both the connecting port (321) and the inlet / outlet (313) are constricted structures with decreasing diameters along the direction from the outer cavity (3112) to the inner cavity (3111).

4. The packaging material hot-melt apparatus according to claim 2, characterized in that, The main body section (322) is also provided with a diversion wedge (3221), which faces the air inlet (312), and the first flow channel (6) and the second flow channel (7) are connected at the diversion wedge (3221).

5. The packaging material hot-melt apparatus according to claim 1, characterized in that, It also includes a temperature sensor (8), which is fixedly connected to the outer shell (31), and the detection end of the temperature sensor (8) is inserted into the inner cavity (3111).

6. The packaging material hot-melt apparatus according to any one of claims 1-5, characterized in that, It also includes an up-and-down movable cylinder (9), which is fixedly connected to the fixed base (1), and the heating cover (3) is fixedly connected to the output end of the up-and-down movable cylinder (9).

7. The packaging material hot-melt apparatus according to claim 6, characterized in that, The fixed base (1) includes a base plate (11), a top plate (12), a guide shaft (13), and a fixed plate (14). The base plate (11) and the top plate (12) are spaced apart in the vertical direction. The guide shaft (13) is connected between the top plate (12) and the base plate (11). The fixed plate (14) is slidably fitted onto the guide shaft (13). The vertically movable cylinder (9) is fixedly connected to the fixed plate (14).

8. A secondary polishing machine, characterized in that, Includes the packaging material hot-melt apparatus according to any one of claims 1-7.

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