Stretching type thermal forming mechanism and stretching type packaging machine thereof

Abstract

The utility model discloses a stretching type thermal forming mechanism and a stretching type packaging machine thereof, the stretching type thermal forming mechanism comprises a base, and is characterized in that an upper die holder is fixedly arranged at the top end of a guide pillar of the base, an upper die is arranged at the lower end of the upper die holder, a plurality of die cores capable of lifting are arranged in the upper die, a lower die holder is arranged on the guide pillar in a sliding mode, and the lower die holder is arranged on the guide pillar. A lower die is arranged at the upper end of the lower die base, a plurality of die cavities are formed in the lower die, and heating assemblies are arranged in the upper die and the lower die; a thermoplastic film material is unwound between the upper die and the lower die, the thermoplastic film material is close to the lower end of the upper die, the base can reciprocate in the unwinding direction of the thermoplastic film material, and the base synchronously moves along with the thermoplastic film material during pulling-up forming; the stretching type packaging machine comprises the stretching type thermal forming mechanism. The heating assembly is integrated on the forming die, the forming die can synchronously move along with the unwound thermoplastic film material, and preheating and stretching forming are completed in the moving process, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to an improved invention for a packaging machine, in particular to an improved invention for a stretch-type thermoforming mechanism and a stretch-type packaging machine thereof. Background Art

[0002] Stretch wrapping machines, also known as stretch film packaging machines, work by preheating and softening the lower film. A forming die is then used to create a cavity in the lower film. The packaged item, such as a silk scarf, is then placed into the formed cavity. The upper film is then heat-sealed to the lower film, and the product is finally cut and collected. This process involves preheating and molding at separate stations, and the process is intermittent. This requires intermittent unwinding of the thermoplastic film to facilitate molding, which reduces production efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a stable, efficient and continuously working stretch-type thermoforming mechanism and a stretch-type packaging machine thereof.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: the stretching thermoforming mechanism includes a base, which is characterized in that: a guide column is provided on the base, an upper mold base is fixedly provided at the top of the guide column, an upper mold is provided at the lower end of the upper mold base, and a plurality of mold cores that can be lifted and lowered are provided in the upper mold, and the mold cores are provided with a first lifting power source, a lower mold base is slidably provided on the guide column, and the lower mold base is provided with a second lifting power source, a lower mold base is provided at the upper end of the lower mold base, a plurality of mold cavities are provided on the lower mold, the mold cavities and the mold cores cooperate, and a heating assembly is provided in the upper mold and the lower mold; a thermoplastic film material is unwound between the upper mold and the lower mold, and the thermoplastic film material is close to the lower end of the upper mold, and the base can reciprocate along the unwinding direction of the thermoplastic film material, and the corresponding base is equipped with a third power source, and during stretching and forming, the base moves synchronously with the thermoplastic film material.

[0005] The first lifting power source is located at the upper end of the upper die base. The corresponding first lifting power source is a motor and its cam connecting rod transmission component. The connecting rod passes through the upper die base and is connected to the die core.

[0006] The second lifting power source is located at the lower end of the base. The corresponding second lifting power source is a motor and its cam connecting rod transmission component. The connecting rod passes through the base and is connected to the lower mold base.

[0007] The third power source is a motor and its synchronous wheel and synchronous belt transmission components. The corresponding base is set on the slide rail, and the base is connected to the synchronous belt transmission.

[0008] The stretch packaging machine includes a frame, on which are provided a thermoplastic film unwinding mechanism, a traction mechanism, a loading mechanism, a film sealing mechanism, a tensioning mechanism, a marking mechanism, a slitting mechanism and a waste collection mechanism, and is characterized in that the frame is also provided with the above-mentioned stretch thermoforming mechanism.

[0009] The traction mechanism is a motor and a chain transmission component thereof. The chain transmission component comprises a matching left and right chain and a sprocket thereof, and a clamping assembly is provided on the chain.

[0010] The distance between the left and right chains is adjustable, and the corresponding sprocket mounting seat is equipped with a mounting seat slide rail and a distance adjusting screw.

[0011] The beneficial effect of the present invention is the improved stretch thermoforming mechanism and its stretch packaging machine, in which a heating component is integrated on the forming mold, and the forming mold can move synchronously with the unwinding thermoplastic film material, completing preheating and stretch forming during the movement, avoiding the waiting time required for intermittent action, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic structural diagram of the stretch-type thermoforming mechanism of the present invention.

[0014] Figure 2 This is a schematic structural diagram of the stretch packaging machine of the present invention. DETAILED DESCRIPTION

[0015] The accompanying drawings show the structure of the present invention, and the following further describes its relevant details in conjunction with the accompanying drawings. Figure 1 The stretch thermoforming mechanism includes a base 11, on which a guide column 12 is provided, preferably four guide columns distributed at the corners of the base 11, an upper die base 13 is fixed on the top of the guide column 12, an upper die 14 is provided at the lower end of the upper die base 13, and a plurality of mold cores that can be lifted and lowered are provided in the upper die 14, and the mold cores are provided with a first lifting power source 15, a lower die base 16 is slidably provided on the guide column 12, and the lower die base 16 is provided with a second lifting power source 18, and a lower die 17 is provided at the upper end of the lower die base 16, and the lower die 17 is provided with a plurality of mold cavities, which cooperate with the mold core, and a heating component is provided in the upper mold 14 and the lower mold 17, and the heating component is preferably a heating tube embedded in the upper mold 14 and the lower mold 17; a thermoplastic film material, such as a PVC film material, is unwound between the upper mold 14 and the lower mold 17, and the thermoplastic film material is close to the lower end of the upper mold 14, and the base 11 can move back and forth along the unwinding direction of the thermoplastic film material. The corresponding base 11 is equipped with a third power source 19, and when pulling and forming, the base 11 moves synchronously with the thermoplastic film material.

[0016] The working principle of the stretch-type thermoforming mechanism 1 of the present invention is that during the unwinding process of the thermoplastic film material, the third power source 19 drives the base 11 and the forming mold thereon to move a distance following the synchronous action. The distance is preferably a mold length of the forming mold in the moving direction. During this process, the second lifting power source 18 drives the lower mold 17 to rise along the guide column 12 and close the mold with the upper mold 14. The thermoplastic film material is pressed between the upper and lower molds 17 and is heated and softened under the action of the heating component. Then the first lifting power source 15 drives the core of the upper mold 14 to descend into the mold cavity of the lower mold 17. The corresponding thermoplastic film material is then stretched and formed to form a cavity that can accommodate the packaging material. After the pulling is completed, the mold core, lower mold 17 and base 11 are reset in sequence to perform the next stretching and forming process.

[0017] As a further improved specific implementation method, the first lifting power source 15 is located at the upper end of the upper mold base 13. The corresponding first lifting power source 15 is a motor and its cam connecting rod transmission component. The connecting rod passes through the upper mold base 13 and is connected to the mold core. The motor drives the cam connecting rod to realize the lifting of the model.

[0018] As a further improved specific implementation method, the second lifting power source 18 is located at the lower end of the base 11, and the corresponding second lifting power source 18 is a motor and its cam connecting rod transmission component. The connecting rod passes through the base 11 and is connected to the lower mold base 16 for transmission. The motor drives the cam connecting rod to realize the lifting of the lower mold base 16 and the lower mold 17.

[0019] As a further improved specific implementation method, the third power source 19 is a motor and its synchronous wheel and synchronous belt transmission components, and the corresponding base 11 is arranged on the slide rail. The base 11 is connected to the synchronous belt drive. The motor drives the synchronous wheel, and the synchronous belt coordinated with the synchronous wheel transmission further drives the base 11 to move back and forth along the slide rail.

[0020] In this embodiment, see the attached Figure 2 The stretch packaging machine comprises a frame on which are mounted a thermoplastic film unwinding mechanism 2, a traction mechanism 3, a loading mechanism, a film sealing mechanism 4, a tensioning mechanism 5, a marking mechanism 6, a slitting mechanism 7, and a waste collection mechanism 8. The frame is also equipped with the aforementioned stretch thermoforming mechanism 1. The aforementioned thermoplastic film unwinding mechanism 2, traction mechanism 3, loading mechanism, film sealing mechanism 4, tensioning mechanism 5, marking mechanism 6, slitting mechanism 7, and waste collection mechanism 8 are all conventional technologies and cooperate with the stretch thermoforming mechanism 1 for packaging. The specific structure is not described in detail here. The loading mechanism is located between the stretch thermoforming mechanism 1 and the film sealing mechanism 4 and is not shown in the figure.

[0021] The working principle of the stretch packaging machine of the present invention is that the thermoplastic film material unrolled by the unwinding mechanism 2 passes through the stretch forming mechanism 1 under the action of the traction mechanism 3 and the tensioning mechanism 5. The corresponding stretch forming mechanism 1 moves synchronously with the thermoplastic film material to perform heating and stretching forming, and a cavity is formed on the thermoplastic film material. After that, the loading mechanism feeds the package into the cavity, and then the upper film unrolled by the film sealing mechanism 4 is heat-sealed on the thermoplastic film material. Then, the marking mechanism 6 performs tracking and marking in sequence, the slitting mechanism 7 performs longitudinal and transverse cutting, and the waste collection mechanism 8 rewinds the waste material.

[0022] As a further improved embodiment, the traction mechanism 3 comprises a motor and its chain transmission component, which includes mating left and right chains and their corresponding sprockets, with clamping assemblies mounted on the chains. During traction, the motor drives the sprockets, which in turn drive the chains in rotational motion. The clamping assemblies on the chains grip the thermoplastic film material and move it. The clamping assemblies are automated, clamping at the beginning and releasing at the end.

[0023] As a further improved embodiment, the spacing between the left and right chains is adjustable, and the corresponding sprocket mounting blocks are equipped with mounting block slide rails and spacing adjustment screws. During adjustment, the screws are rotated, and the corresponding screw threads act to move the drive sprocket mounting blocks closer or further along the slide rails, thereby adjusting the spacing between the left and right chains to accommodate thermoplastic film materials of varying widths.

[0024] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A stretch-type thermoforming mechanism, including a base, characterized in that: The base is provided with a guide column, the top of the guide column is fixedly provided with an upper mold base, the lower end of the upper mold base is provided with an upper mold, the upper mold is equipped with a number of mold cores that can be raised and lowered, and the mold cores are provided with a first lifting power source, the guide column is slidably provided with a lower mold base, the lower mold base is provided with a second lifting power source, the upper end of the lower mold base is provided with a lower mold, the lower mold is provided with a number of mold cavities, the mold cavities and the mold cores cooperate, and heating components are provided in the upper and lower molds; a thermoplastic film material is unwound between the upper and lower molds, and the thermoplastic film material is close to the lower end of the upper mold, and the base can reciprocate along the unwinding direction of the thermoplastic film material, and the corresponding base is equipped with a third power source, and during pull-forming, the base moves synchronously with the thermoplastic film material.

2. The stretch thermoforming mechanism according to claim 1, wherein: The first lifting power source is located at the upper end of the upper die base. The corresponding first lifting power source is a motor and its cam connecting rod transmission component. The connecting rod passes through the upper die base and is connected to the die core.

3. The stretch thermoforming mechanism according to claim 1, wherein: The second lifting power source is located at the lower end of the base. The corresponding second lifting power source is a motor and its cam connecting rod transmission component. The connecting rod passes through the base and is connected to the lower mold base.

4. The stretch thermoforming mechanism according to claim 1, wherein: The third power source is a motor and its synchronous wheel and synchronous belt transmission components. The corresponding base is set on the slide rail, and the base is connected to the synchronous belt transmission.

5. A stretch packaging machine, comprising a frame, on which are provided a thermoplastic film unwinding mechanism, a traction mechanism, a loading mechanism, a film sealing mechanism, a tensioning mechanism, a marking mechanism, a slitting mechanism, and a waste collection mechanism, characterized in that: The frame is also provided with a stretch thermoforming mechanism as described in any one of claims 1 to 4.

6. The stretch packaging machine according to claim 5, characterized in that: The traction mechanism is a motor and a chain transmission component thereof. The chain transmission component comprises a matching left and right chain and a sprocket thereof, and a clamping assembly is provided on the chain.

7. The stretch packaging machine according to claim 6, characterized in that: The distance between the left and right chains is adjustable, and the corresponding sprocket mounting seat is equipped with a mounting seat slide rail and a distance adjusting screw.

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