A sealing strip hot-pressing device for packaging bags

Abstract

The utility model relates to packing bag production equipment technical field, specifically disclose the embodiment disclosed a kind of packing bag sealing strip hot-pressing device, including support, first conveying mechanism, hot-pressing mechanism and second conveying mechanism;Hot-pressing mechanism includes frame, hot-pressing adjusting assembly, first lifting drive device and second lifting drive device;Every hot-pressing adjusting assembly includes fixed seat, two sliders, positive and negative screw rod, mounting seat, electric heating sheet, heat conducting block and briquetting. When working, packing bag is sent into hot-pressing station by first conveying mechanism, first lifting drive device and second lifting drive device control two briquetting folding, and the edge of sealing strip is hot-pressed and sealed;The heat generated by electric heating sheet is conducted to briquetting by heat conducting block, realizes fusion sealing;The spacing of two sides briquetting can be adjusted by adjusting positive and negative screw rod, and the packing bag of different width is adapted.

Description

Technical Field

[0001] This utility model relates to the technical field of packaging bag production equipment, and in particular to a hot pressing device for packaging bag sealing strips. Background Technology

[0002] A sealing strip, also known as a self-sealing strip, is a plastic component used to enable the quick opening and closing of packaging bags. With rising living standards, plastic packaging bags with sealing strips are increasingly widely used in daily life and industrial production. These bags are typically made by first bonding two pieces of plastic film together along their width to form a cylindrical structure, then placing a sealing strip at the bag opening, and finally using heat pressing to firmly bond the sealing strip to the bag body, thus completing the sealing process.

[0003] In existing technologies, after the main body of the sealing strip is heat-pressed and sealed, gaps may still exist on both sides of its edges along the width of the bag opening, which can easily lead to poor sealing and gas leakage. To solve this problem, a secondary heat-pressing method is often used, either by manually operating a heating clamp or by adding fixed heating clamps to both sides of the conveyor line, to enhance the edge sealing performance. For example, Chinese Patent Publication No. CN214448994U discloses a sealing strip sealing device for plastic packaging bags, which achieves preliminary sealing of the sealing strip by setting up a heat-pressing mechanism, a flaring mechanism, and a feeding mechanism, but does not involve a structure for adjustable heat-pressing treatment of the sealing strip edges.

[0004] However, existing edge hot pressing methods have obvious limitations: manual operation is inefficient and inconsistent; and the fixed heating chuck cannot adjust the clamping position according to the packaging bags of different widths, nor can it adapt to the hot pressing area requirements of different specifications of sealing strips, resulting in poor equipment versatility and difficulty in meeting the production needs of multiple specifications and small batches.

[0005] Therefore, there is an urgent need for a hot pressing device that can flexibly adjust the hot pressing width and pressing area to improve production adaptability and automation level. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a hot pressing device for sealing strips of packaging bags to solve the above problems.

[0007] A hot-pressing device for sealing strips of packaging bags includes a support frame, and a first conveying mechanism, a hot-pressing mechanism, and a second conveying mechanism sequentially arranged on the support frame along the x-direction. The hot-pressing mechanism includes: A frame, wherein two columns are provided on the inner side of the frame along the z-direction; Two hot-pressing adjustment components are slidably mounted on the two columns along the z-axis, and are arranged opposite to each other; each hot-pressing adjustment component includes: The fixed base is provided with a sliding groove; Two sliders are slidably disposed within the groove along the y-direction; The positive and negative screws are used to drive the two sliders to move synchronously in opposite directions or in the opposite direction along the y-axis; Mounting base, fixed on the slider; The heating element is fixed to the inside of the mounting base; A heat-conducting block is detachably fixed to the inside of the mounting base and abuts against the heating element; A pressure block is fixed onto the heat-conducting block; The first lifting drive device is fixed to the top of the frame and is used to drive the upper hot pressure adjustment component to move along the z-direction; The second lifting drive device is fixed to the bottom of the frame and is used to drive the thermostatic adjustment component below to move along the z-direction.

[0008] Specifically, a knob is connected to either end of the positive or negative screw, and the surface of the knob is provided with anti-slip texture.

[0009] Specifically, the heating element is connected to a wire, and a clearance hole is provided on one side of the fixing base for adjusting the position of the wire in the y-direction.

[0010] Specifically, both the first lifting drive device and the second lifting drive device are electric push cylinders.

[0011] Specifically, both the first conveying mechanism and the second conveying mechanism are belt conveyor devices.

[0012] Specifically, the first conveying mechanism and the second conveying mechanism achieve synchronous transmission through a linkage mechanism, which includes: The first extension shaft is connected to one end of the drive shaft of the first conveying mechanism; The first transmission wheel is fixed on the first extension shaft; The second extension shaft is connected to one end of the drive shaft of the second conveying mechanism; The second transmission wheel is fixed on the second extension shaft; A drive belt connects the first drive wheel and the second drive wheel.

[0013] Specifically, the first conveying mechanism is equipped with a feeding position adjustment mechanism, which includes: Adjustment plate, fixed on the bracket; Two limiting baffles are fixed to the adjusting plate and their installation position can be adjusted along the y-direction; a feeding channel for the packaging bag to pass through is formed between the two limiting baffles.

[0014] Specifically, the hot pressing mechanism further includes a downward pressure buffer mechanism, which includes: A lifting push plate is disposed at the drive end of the first lifting drive device; A spring is disposed between the lifting push plate and the fixed seat above it.

[0015] The beneficial effects of this utility model are: This application discloses a hot-pressing device for sealing strips on packaging bags. A packaging bag with a sealing strip is fed in by a first conveying mechanism, and then continuously conveyed by a second conveying mechanism as it passes through the hot-pressing area. When the sealing strip moves to the hot-pressing station, a first lifting drive device drives the upper hot-pressing adjustment component downwards, and a second lifting drive device drives the lower hot-pressing adjustment component upwards, causing corresponding upper and lower pressure blocks to clamp the edge of the sealing strip for hot pressing. An electric heating element generates heat, which is conducted to the pressure blocks via a heat-conducting block, achieving a fusion seal on the edge of the sealing strip. Two sliders can be moved synchronously along the y-axis by positive and negative screws, thereby adjusting the distance between the pressure blocks on both sides to accommodate packaging bags of different widths. The overall structure operates in a coordinated manner, achieving reliable hot pressing and flexible adjustment of the sealing strip edge, effectively improving sealing quality and equipment adaptability. Attached Figure Description

[0016] Figure 1 The three-dimensional packaging bag sealing strip heat pressing device of this application Figure 1 ; Figure 2 for Figure 1 Enlarged view of section A; Figure 3 The three-dimensional packaging bag sealing strip heat pressing device of this application Figure 2 ; Figure 4 for Figure 3 Enlarged view of section B; Figure 5 This is a front view of the hot pressing device for the packaging bag sealing strip of this application; Figure 6 for Figure 5 A three-dimensional sectional view along the CC line; Figure 7 for Figure 6 Enlarged view of section D; Figure 8 A schematic diagram of the sealing strip inside the packaging bag before and after it is flattened; The attached figures are labeled as follows: bracket 10, first conveying mechanism 20, hot pressing mechanism 30, second conveying mechanism 40, frame 31, column 311, hot pressing adjustment component 32, fixed seat 321, slide 3211, clearance hole 3212, slider 322, positive and negative screw 323, mounting seat 324, heating element 325, heat-conducting block 326, pressure block 327, first lifting drive device 33, second lifting drive device 34, knob part 3231, wire 3251, linkage mechanism 50, first extension shaft 51, first transmission wheel 52, second extension shaft 53, second transmission wheel 54, transmission belt 55, feeding position adjustment mechanism 60, adjusting plate 61, limit baffle 62, packaging bag 70, sealing strip 71, downward pressure buffer mechanism 80, lifting push plate 81, spring 82. Detailed Implementation

[0017] This utility model provides a hot-pressing device for sealing strips on packaging bags. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Please refer to Figures 1-8 This embodiment discloses a hot-pressing device for sealing strips of packaging bags, including a support 10 and a first conveying mechanism 20, a hot-pressing mechanism 30, and a second conveying mechanism 40 sequentially arranged on the support 10 along the x-direction. The hot-pressing mechanism 30 includes a frame 31, two hot-pressing adjustment components 32, a first lifting drive device 33, and a second lifting drive device 34. Two columns 311 arranged along the z-direction are provided on the inner side of the frame 31. The two hot-pressing adjustment components 32 are slidably arranged on the two columns 311 along the z-direction, and the two are arranged opposite to each other. The first lifting drive device 33 is fixed to the top of the frame 31 and is used to drive the upper hot-pressing adjustment component 32 to move along the z-direction. The second lifting drive device 34 is fixed to the bottom of the frame 31 and is used to drive the lower hot-pressing adjustment component 32 to move along the z-direction. Each hot-pressing adjustment assembly 32 includes a fixed base 321, two sliders 322, a positive and negative screw 323, a mounting base 324, an electric heating element 325, a heat-conducting block 326, and a pressure block 327. The fixed base 321 is provided with a sliding groove 3211. The two sliders 322 are slidably disposed in the sliding groove 3211 along the y-direction. The positive and negative screw 323 is used to drive the two sliders 322 to move synchronously in opposite directions or in opposite directions along the y-direction. The mounting base 324 is fixed on the sliders 322. The electric heating element 325 is fixed on the inner side of the mounting base 324. The heat-conducting block 326 is detachably fixed on the inner side of the mounting base 324 and abuts against the electric heating element 325. The pressure block 327 is fixed on the heat-conducting block 326.

[0020] In this embodiment, when the hot pressing device for sealing strips of packaging bags is in operation, the packaging bag 70 with sealing strip 71 is fed in by the first conveying mechanism 20, and when it passes through the area of ​​the hot pressing mechanism 30, it is continued to be conveyed by the second conveying mechanism 40. When the sealing strip 71 moves to the hot pressing station, the first lifting drive device 33 drives the upper hot pressing adjustment component 32 to move down, and the second lifting drive device 34 drives the lower hot pressing adjustment component 32 to move up, so that the upper and lower corresponding pressure blocks 327 together clamp the edge of the sealing strip 71 for hot pressing. During this process, the heating element 325 generates heat, and the heat is conducted to the pressure block 327 through the heat conducting block 326, so as to achieve fusion sealing of the edge of the sealing strip 71. The positive and negative screws 323 can drive the two sliders 322 to move synchronously in opposite directions or in opposite directions along the y direction, thereby adjusting the distance between the two pressure blocks 327 to adapt to packaging bags 70 of different widths. The overall structure moves in a coordinated manner, realizing reliable hot pressing and flexible adjustment of the edge of the sealing strip 71, effectively improving the sealing quality and equipment adaptability.

[0021] Furthermore, a knob 3231 is connected to either end of the positive and negative screws 323. The surface of the knob 3231 is provided with anti-slip texture. The positive and negative screws 323 include a first threaded section and a second threaded section with opposite thread directions at both ends along the axial direction. The two sliders 322 are threadedly engaged with the first threaded section and the second threaded section, respectively. When it is necessary to adjust the distance between the two pressure blocks 327 on the same hot-press adjustment component 32 along the y direction, the positive and negative screws 323 can be rotated through the knob 3231, thereby driving the two sliders 322 to move synchronously in opposite directions along the y direction to achieve synchronous adjustment.

[0022] Furthermore, the heating element 325 is connected to a wire 3251, and a clearance hole 3212 is provided on one side of the fixing base 321 for adjusting the position of the wire 3251 in the y-direction. To achieve reliable heat-sealing of the packaging bag 70 and the sealing strip 71, this device adopts a combination of electric heating and temperature control. Specifically, the heating element 325 is connected to an external temperature control system via the wire 3251, and can convert electrical energy into heat energy after being energized. This heat is rapidly conducted to the pressing block 327 through the closely contacting heat-conducting block 326, raising its working surface to a preset temperature. To accurately control the hot-pressing temperature, a temperature sensor (not shown in the figure) can be placed near the heat-conducting block 326 or the pressing block 327. This sensor detects the temperature in real time and feeds it back to the temperature control system. The temperature control system compares the detected value with the set value and dynamically adjusts the current input to the heating element 325 through control algorithms such as PID, thereby maintaining the stability of the working temperature of the pressing block 327 and avoiding excessive melting of the packaging material due to excessive temperature or weak adhesion due to insufficient temperature.

[0023] During the hot pressing process, the upper and lower pressure blocks 327, both at a set temperature, work together on the edge area of ​​the sealing strip 71, causing the plastic material in that area to melt instantly. Under continuous pressure, the molten sealing strip 71 material permeates and fuses with the surface of the packaging bag 70, forming an integrated sealing structure after cooling. This effectively eliminates edge gaps and prevents gas leakage. The clearance hole 3212 on the side wall of the fixing seat 321 ensures that when the slider 322 moves the heating element 325 and the wire 3251 to adjust their position along the y-axis, the wire 3251 has sufficient room to move without being pulled or interfered with, ensuring the reliability of the circuit connection and the safety of the adjustment process. The entire system achieves precise control of the hot-melt temperature and pressing position through the synergistic effect of electrothermal conversion, closed-loop temperature control, and mechanical pressing, ensuring the consistency and reliability of the edge hot pressing process.

[0024] Furthermore, both the first lifting drive device 33 and the second lifting drive device 34 are electric push cylinders. They can provide stable and controllable linear drive, ensuring precise synchronization of the pressing action of the upper and lower hot pressure adjustment components 32.

[0025] Furthermore, both the first conveying mechanism 20 and the second conveying mechanism 40 are belt conveyors. These are used to smoothly transport the packaging bags 70, allowing them to pass sequentially through the hot pressing station.

[0026] To achieve synchronous conveying, the first conveying mechanism 20 and the second conveying mechanism 40 are synchronously driven by a linkage mechanism 50. The linkage mechanism 50 includes a first extension shaft 51, a first transmission wheel 52, a second extension shaft 53, a second transmission wheel 54, and a transmission belt 55. The first extension shaft 51 is connected to one end of the drive shaft of the first conveying mechanism 20; the first transmission wheel 52 is fixed to the first extension shaft 51; the second extension shaft 53 is connected to one end of the drive shaft of the second conveying mechanism 40; the second transmission wheel 54 is fixed to the second extension shaft 53; and the transmission belt 55 connects the first transmission wheel 52 and the second transmission wheel 54. Specifically, the drive shaft of the first conveying mechanism 20 drives the first transmission wheel 52 to rotate through the first extension shaft 51, and then transmits the power to the second transmission wheel 54 and the second extension shaft 53 through the transmission belt 55, thereby driving the second conveying mechanism 40. This ensures that the packaging bags 70 move at a consistent speed when entering and exiting the hot-pressing area, avoiding pulling or piling up.

[0027] Furthermore, the first conveying mechanism 20 is equipped with a feeding position adjustment mechanism 60, which includes an adjusting plate 61 and two limiting baffles 62. The adjusting plate 61 is fixed to the bracket 10; the two limiting baffles 62 are fixed to the adjusting plate 61 and can be adjusted in the y-direction; a feeding channel for the packaging bag 70 to pass through is formed between the two limiting baffles 62. The two limiting baffles 62 can move along the y-direction on the adjusting plate 61 to change the width of the feeding channel, thereby guiding and centering packaging bags 70 of different widths, ensuring that the packaging bag 70 enters the hot pressing mechanism 30 in the correct position.

[0028] Furthermore, the hot pressing mechanism 30 also includes a downward pressure buffer mechanism 80, which includes a lifting push plate 81 and a spring 82. The lifting push plate 81 is disposed at the drive end of the first lifting drive device 33; the spring 82 is disposed between the lifting push plate 81 and the upper fixed seat 321. When the first lifting drive device 33 drives the upper hot pressing adjustment component 32 to press down through the lifting push plate 81, the spring 82 can provide buffering, absorb part of the impact force, and make the contact process between the pressing block 327 and the sealing strip 71 more gentle and stable, which helps to protect the surface of the packaging bag 70 and improve the pressing quality.

[0029] The preferred embodiments of this utility model have been described in detail above. However, this invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this invention.

Claims

1. A hot pressing device for sealing strips of packaging bags, comprising a support (10), and a first conveying mechanism (20), a hot pressing mechanism (30), and a second conveying mechanism (40) sequentially arranged along the x-direction on the support (10), characterized in that, The hot pressing mechanism (30) includes: The frame (31) has two columns (311) arranged along the z direction on its inner side. Two hot-pressing adjustment components (32) are slidably disposed on the two columns (311) along the z-direction, and are arranged opposite to each other; each hot-pressing adjustment component (32) includes: A fixed base (321) is provided with a sliding groove (3211); Two sliders (322) are slidably disposed in the groove (3211) along the y-direction; The positive and negative screws (323) are used to drive the two sliders (322) to move synchronously in opposite directions or in opposite directions along the y-direction; Mounting base (324) is fixed to the slider (322); The heating element (325) is fixed to the inside of the mounting base (324); The heat-conducting block (326) is detachably fixed to the inside of the mounting base (324) and abuts against the heating element (325); The pressure block (327) is fixed on the heat-conducting block (326); The first lifting drive device (33) is fixed to the top of the frame (31) and is used to drive the upper hot pressure adjustment component (32) to move along the z direction; The second lifting drive device (34) is fixed to the bottom of the frame (31) and is used to drive the thermo-pressure adjustment component (32) below to move along the z direction.

2. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, Each end of the positive and negative screws (323) is connected to a knob (3231), and the surface of the knob (3231) is provided with anti-slip texture.

3. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, The heating element (325) is connected to a wire (3251), and a clearance hole (3212) is provided on one side of the fixing base (321) for adjusting the position of the wire (3251) in the y-direction.

4. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, Both the first lifting drive device (33) and the second lifting drive device (34) are electric push cylinders.

5. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, Both the first conveying mechanism (20) and the second conveying mechanism (40) are belt conveyors.

6. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, The first conveying mechanism (20) and the second conveying mechanism (40) are synchronously driven by a linkage mechanism (50), which includes: The first extension shaft (51) is connected to one end of the drive shaft of the first conveying mechanism (20); The first transmission wheel (52) is fixed on the first extension shaft (51); The second extension shaft (53) is connected to one end of the drive shaft of the second conveying mechanism (40); The second transmission wheel (54) is fixed on the second extension shaft (53); A drive belt (55) connects the first drive wheel (52) and the second drive wheel (54).

7. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, The first conveying mechanism (20) is provided with a feeding position adjustment mechanism (60), the feeding position adjustment mechanism (60) includes: Adjustment plate (61) is fixed to the bracket (10); Two limiting baffles (62) are fixed on the adjusting plate (61) and can be adjusted in the y direction; a feeding channel for the packaging bag (70) to pass through is formed between the two limiting baffles (62).

8. The hot pressing device for sealing strips of packaging bags according to claim 1, characterized in that, The hot pressing mechanism (30) further includes a pressure buffer mechanism (80), which includes: The lifting push plate (81) is disposed at the drive end of the first lifting drive device (33); A spring (82) is disposed between the lifting push plate (81) and the fixed seat (321) above it.

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