A ring-type continuous heat sealing device

Abstract

This utility model discloses a ring-type continuous heat sealing device, including a frame. The frame is equipped with a main conveyor belt for transporting workpieces to be heat-pressed and a conveying drive device for driving its operation. A vertical plate is positioned above the main conveyor belt, and a ring track is arranged around the perimeter of the vertical plate. The ring track includes a lower straight section, a left semicircular section, an upper straight section, and a right semicircular section connected in sequence. Several slider assemblies are slidably connected to the ring track. Each slider assembly is equipped with a heat-pressing device that heat-presses the workpiece on the main conveyor belt when it reaches the lower straight section. A main drive device is provided between the slider assembly and the vertical plate to drive it to slide along the ring track. A conductive structure for supplying power to the heat-pressing device is also provided between the slider assembly and the ring track. This utility model has the advantages of achieving continuous, high-speed, efficient, and stable heat sealing.

Description

Technical Field

[0001] This utility model relates to the field of heat sealing technology, and in particular to a ring-type continuous heat sealing device. Background Technology

[0002] In existing technologies, conventional heat sealing devices, especially linear heat sealing devices widely used in packaging and bag making, typically employ reciprocating motion for heat sealing. Specifically, the working process of such devices usually includes the following steps: First, the heat-pressing head (or heat-pressing plate) is pressed down from its raised state to contact the packaging material (such as film) to be sealed; then, while maintaining contact with the material and applying a certain sealing pressure, the heat-pressing head moves forward a predetermined distance with the material (or relative to the material), completing the heating and pressurization of the sealing area; next, the heat-pressing head is lifted upwards, detaching from the material; finally, the heat-pressing head quickly moves backwards, returning to its initial position, ready for the next heat sealing cycle.

[0003] However, this linear reciprocating heat sealing device has significant drawbacks. First, because the heat press head must move in both forward and backward directions, the backward return process does not produce an effective heat sealing effect; it is purely an auxiliary stroke, which greatly consumes the work cycle time. This limits the overall heat sealing speed of the equipment, making it difficult to further increase, thus affecting production efficiency, especially in applications requiring high-speed, high-volume production. Second, frequent starts, stops, and reversals cause significant impact and wear on the mechanical structure of the equipment, such as the drive mechanism, guide rails, and connectors. This not only increases maintenance costs but also shortens the equipment's lifespan. Furthermore, to achieve precise reciprocating motion and stable sealing pressure control, the transmission and control systems of linear heat sealing devices are typically complex, resulting in relatively high manufacturing costs. In addition, for continuously fed packaging production lines, this intermittent heat sealing method requires complex synchronous control to ensure the material remains relatively stationary or moves synchronously during heat sealing, increasing the system's complexity and adjustment difficulty.

[0004] Therefore, it is necessary to further improve and perfect the existing technology to overcome these shortcomings, and this utility model is made based on this situation. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a ring-type continuous heat sealing device that can achieve continuous, high-speed, high-efficiency and stable heat sealing.

[0006] This utility model is achieved through the following technical solution:

[0007] To solve the above-mentioned technical problems, this utility model provides a ring-type continuous heat sealing device, including a frame. The frame is equipped with a main conveyor belt for conveying workpieces to be heat-pressed and a conveying drive device for driving its operation. A vertical plate is provided above the main conveyor belt, and a ring track is provided around the periphery of the vertical plate. The ring track includes a lower straight section, a left semicircular section, an upper straight section, and a right semicircular section connected in sequence. A plurality of slider assemblies are slidably connected on the ring track. Each slider assembly is equipped with a heat pressing device that can heat-press the workpieces on the main conveyor belt when it rotates to the lower straight section. A main drive device for driving the slider assembly to slide along the ring track is provided between the slider assembly and the vertical plate. A conductive structure for supplying power to the heat pressing device is also provided between the slider assembly and the ring track.

[0008] To further address the technical problems addressed by this utility model, a ring-type continuous heat sealing device is provided. The slider assembly includes a support, on which a roller assembly cooperating with a ring track is rotatably connected. A fixed plate is fixedly connected to the support, and a liftable upper movable plate is movably connected above the fixed plate. The upper surface of the upper movable plate abuts against the side of the upright plate. A first elastic reset member that elastically presses upward against the upper movable plate is provided between the upper movable plate and the fixed plate. A lower movable plate located below the fixed plate is fixedly connected to the upper movable plate, and the heat-pressing device is disposed on the lower movable plate.

[0009] To further solve the technical problem to be solved by this utility model, this utility model provides a ring-type continuous heat sealing device, wherein the hot pressing device includes a hot pressing plate that is movably connected to the lower movable plate and can be raised and lowered, and a heating element disposed in the hot pressing plate. A second elastic reset member is provided between the hot pressing plate and the lower movable plate for elastically pressing the hot pressing plate downward.

[0010] In order to further solve the technical problem to be solved by this utility model, in the annular continuous heat sealing device provided by this utility model, the upper surface of the upper movable plate is rotatably connected with a number of rollers that abut against the side of the vertical plate.

[0011] To further address the technical problems to be solved by this utility model, this utility model provides a ring-type continuous heat sealing device in which the side of the upright plate includes a lower side, a left semi-circular side, an upper side, and a right semi-circular side connected in sequence, and the vertical distance D from the lower side of the upright plate to the center O of the right semi-circular side is greater than the radius R of the right semi-circular side.

[0012] To further address the technical problems addressed by this utility model, a ring-type continuous heat sealing device is provided. The conductive structure includes carbon brushes disposed on each slider and conductive sheets disposed on the vertical plate. The conductive sheets include parallel cathode and anode wires. The conductive sheets are electrically connected to a power supply. The carbon brushes are electrically connected to the hot-pressing device, and the free end of the carbon brushes can elastically abut against the conductive sheets.

[0013] To further address the technical problems to be solved by this utility model, this utility model provides a ring-type continuous heat sealing device in which the conductive sheet includes a hot pressing section arranged parallel to the lower straight section.

[0014] To further address the technical problems to be solved by this utility model, the present utility model provides a ring-type continuous heat sealing device in which the conductive sheet further includes a preheating section arranged parallel to the right semicircular segment.

[0015] In order to further solve the technical problem to be solved by this utility model, the present utility model provides a ring-type continuous heat sealing device, wherein the main driving device includes an active wheel and a drive wheel rotatably connected to the left and right ends of the vertical plate, a drive motor for driving the active wheel to rotate, and a chain or belt connected between the active wheel and the drive wheel, and each of the slider assemblies is connected to the chain or belt at intervals.

[0016] To further address the technical problems to be solved by this utility model, the present utility model provides a ring-type continuous heat sealing device in which a crossbeam is provided on the frame, the upright plate is slidably connected to the crossbeam along the transverse direction of the main conveyor belt, and the upright plate is provided with a transverse adjustment device for driving its transverse translation.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This utility model discloses a ring-type continuous heat-sealing device. Its core innovation lies in overturning the reciprocating motion mode of existing linear heat-sealing devices by innovatively employing multiple hot-pressing devices that can continuously cycle along a ring track. By integrating the hot-pressing devices onto the slider assembly and cleverly utilizing the specific contour shape of the vertical plate side in conjunction with an elastic reset component, the hot-pressing devices achieve automatic periodic pressing (in the hot-pressing area) and lifting (in the non-hot-pressing area) during the ring motion, eliminating the need for separate lifting, pressing, and return mechanisms. Compared to existing technologies, this ring-type continuous motion design completely eliminates non-working strokes, significantly improving hot-pressing speed and production efficiency, achieving true continuous heat sealing. Simultaneously, the continuous motion mode replaces frequent starts, stops, and reversals, greatly reducing mechanical wear and improving equipment stability and service life. Furthermore, by adding a lateral adjustment device, the adaptability and adjustment accuracy of the equipment to workpieces of different specifications or positions are further improved. Therefore, this utility model has significant technological advancements and practical value in terms of heat-sealing speed, efficiency, reliability, maintenance costs, and adaptability. Attached Figure Description

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model;

[0021] Figure 2 This is the second three-dimensional structural schematic diagram of this utility model;

[0022] Figure 3 This is an exploded view of the upright panel;

[0023] Figure 4 This is a partial structural diagram of the right end of the upright plate;

[0024] Figure 5 This is a 3D structural diagram of the slider assembly;

[0025] Figure 6 This is a cross-sectional view of the slider component;

[0026] Figure 7 This is an exploded view of the slider component;

[0027] Figure 8 This is a schematic diagram of the cross-section at the vertical plate. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 8 As shown, this utility model provides a ring-type continuous heat sealing device. This device differs from conventional hot-pressing devices that use linear reciprocating motion. By designing a hot-pressing component capable of continuous ring-type motion, it achieves a faster, more efficient, and more continuous heat sealing process, while reducing the mechanical impact and wear caused by reciprocating motion.

[0030] Specifically, the ring-type continuous heat sealing device of this utility model includes a frame 1, on which a main conveyor belt 2 for carrying and conveying the workpiece to be heat-pressed is provided. The main conveyor belt 2 is driven by a conveying drive device 21 (e.g., composed of a motor, a reducer and a transmission mechanism) to continuously convey the packaging material or product to be heat-pressed forward at a preset speed.

[0031] On the frame 1, preferably above the main conveyor belt 2, a transverse support structure, such as a crossbeam 9, is also provided. The crossbeam 9 extends along the transverse direction of the main conveyor belt 2 (i.e., the horizontal direction perpendicular to the movement direction of the main conveyor belt 2). The upright plate 3 is slidably connected to the crossbeam 9. The upright plate 3 is arranged perpendicular to the plane of the main conveyor belt 2 and serves as a core component for guiding and supporting the annular motion assembly. Through this sliding connection, the upright plate 3 can be translated along the crossbeam 9 in the transverse direction of the main conveyor belt 2. To achieve precise adjustment of the transverse position of the upright plate 3, a transverse adjustment device for driving its transverse translation is also provided on the upright plate 3.

[0032] Furthermore, to achieve high-precision and stable lateral position adjustment, the lateral adjustment device includes a ball screw assembly 91 disposed between the vertical plate 3 and the frame 1 (or a support fixed to the frame 1). The ball screw assembly 91 has the function of converting rotational motion into precise linear motion. One end of the screw (or nut, depending on the specific installation method) of the ball screw assembly 91 is fixedly connected to the frame 1, and the other end is connected to the vertical plate 3 through the nut (or screw). The screw (or the rotating shaft connected to the screw) of the ball screw assembly 91 is provided with an adjusting handwheel 92 for manually adjusting the lateral position of the vertical plate 3. By rotating the adjusting handwheel 92, the screw of the ball screw assembly 91 is driven to rotate, thereby driving the nut that cooperates with the screw and the vertical plate 3 connected to the nut to achieve precise lateral translation along the crossbeam 9. This manual adjustment method is simple to operate, low in cost, and suitable for positioning when installing, debugging, or changing workpieces of different specifications.

[0033] By setting a lateral adjustment device, the lateral position of the entire ring-type heat sealing mechanism (including the vertical plate 3, the ring track 4 and the slider assembly 5) relative to the workpiece on the main conveyor belt 2 can be conveniently and accurately adjusted, ensuring that the hot press plate 61 can be accurately aligned with the sealing area of ​​the workpiece, thereby ensuring the sealing quality and improving the adaptability of the equipment to workpieces of different sizes or positional deviations.

[0034] A closed loop track structure, i.e., a loop track 4, is fixed or integrated around the periphery of the upright plate 3. This loop track 4 is preferably a closed trajectory containing straight line segments and circular arc segments. Specifically, in this embodiment, as shown... Figure 3 As shown, the circular track 4 includes a lower straight segment 41, a left semicircular segment 42, an upper straight segment 43, and a right semicircular segment 44 connected in sequence. These track segments together constitute the motion path of the slider assembly.

[0035] Several slider assemblies 5 are slidably connected to the annular track 4. These slider assemblies 5 are moving units that carry the hot pressing device and can continuously circulate along the annular track 4. Each slider assembly 5 is equipped with a hot pressing device 6, which is designed to apply hot pressing to the workpiece on the main conveyor belt 2 when the slider assembly 5 moves to the lower straight section 41 of the annular track 4 (i.e., the area located directly above the main conveyor belt 2 and parallel to the running direction of the main conveyor belt 2).

[0036] To drive the slider assemblies 5 to move continuously along the annular track 4, a main drive device 7 is provided between the slider assembly 5 and the upright plate 3. The main drive device 7 provides power to the slider assembly, enabling it to run at a preset speed and trajectory. In addition, to provide a continuous and stable electrical energy to the hot pressing device 6 during the movement of the slider assembly 5, a conductive structure 8 for supplying power to the hot pressing device 6 is also provided between the slider assembly 5 and the annular track 4 area of ​​the upright plate 3.

[0037] The core of this invention lies in the use of a circularly movable hot-pressing device 6, which is integrated onto a slider assembly 5 that can continuously rotate along a circular track 4. By setting multiple slider assemblies 5 to circulate along the circular track, multiple slider assemblies successively enter the lower straight section 41, thereby realizing continuous hot pressing of workpieces continuously conveyed on the main conveyor belt 2. This avoids the time occupied by non-working strokes such as the lifting and retraction of the hot-pressing head in traditional linear reciprocating heat-sealing devices, significantly improving the hot-pressing speed and production efficiency. At the same time, since the hot-pressing device mainly performs continuous circular motion, frequent start-up, stopping, and reversing impacts are avoided, reducing mechanical wear and improving equipment stability and service life.

[0038] In order to enable the hot pressing device 6 to automatically lift and press down when it moves to different track sections, and to provide stable heat sealing pressure, the slider assembly 5 and the hot pressing device 6 have a more sophisticated structural design.

[0039] Specifically, the slider assembly 5 includes a bracket 51, on which a roller assembly 52 that cooperates with the annular track 4 is rotatably connected. The roller assembly 52 consists of, for example, multiple bearing rollers, which, through cooperation with the inner and outer sides or the upper and lower sides of the annular track 4, enable the slider assembly 5 to slide smoothly and be guided on the track.

[0040] A fixed plate 53 is fixedly connected to the bracket 51. The fixed plate 53 is a base for the internal structure of the slider assembly. A liftable upper movable plate 54 is movably connected above the fixed plate 53. The upper movable plate 54 is a key component for raising / lowering the hot press head. The upper surface of the upper movable plate 54 is designed to abut against the side of the upright plate 3. The vertical position of the upper movable plate 54 can be controlled by specific shape changes of the side of the upright plate 3. To ensure that the upper movable plate 54 can closely follow the contour changes of the side of the upright plate 3 and has a certain upward elastic return capability, a first elastic return member 55 is provided between the upper movable plate 54 and the fixed plate 53. This first elastic return member 55 (e.g., a compression spring or rubber pad) elastically presses the upper movable plate 54 upward.

[0041] The hot pressing device 6 is not directly fixed to the fixed plate 53, but is located on the lower movable plate 56 below the fixed plate 53. This lower movable plate 56 is fixedly connected to the upper movable plate 54, so the lower movable plate 56 will rise and fall synchronously with the upper movable plate 54. The entire hot pressing device 6, including its key component hot pressing plate 61, is installed on the lower movable plate 56.

[0042] The hot pressing device 6 itself includes a hot pressing plate 61 that is movably connected to the lower movable plate 56 and can be raised and lowered, and a heating element (not shown, such as an electric heating tube or heating wire) for generating heat disposed inside the hot pressing plate 61. In order to apply a stable and adjustable sealing pressure to the workpiece when the hot pressing plate 61 is pressed down, a second elastic reset member 62 (e.g., a compression spring) is provided between the hot pressing plate 61 and the lower movable plate 56 for elastically pressing the hot pressing plate 61 downward. When the upper movable plate 54 descends (thereby causing the lower movable plate 56 and the hot pressing plate 61 to descend as a whole) until the hot pressing plate 61 contacts the workpiece on the main conveyor belt 2, the second elastic reset member 62 is further compressed, thereby generating a downward elastic pressure on the hot pressing plate 61, i.e., heat sealing pressure.

[0043] To further reduce friction when the upper movable plate 54 abuts against the side of the upright plate 3, improve the smoothness of movement, and reduce wear, preferably, a plurality of rollers 541 that abut against the side of the upright plate 3 are rotatably connected to the upper surface of the upper movable plate 54. These rollers 541 can roll as the upper movable plate 54 slides along the side of the upright plate 3, thereby achieving low-friction contact.

[0044] The side shape of the upright plate 3 is crucial for controlling the lifting and lowering of the hot press plate. This side includes a lower side 31, a left semi-circular side 32, an upper side 33, and a right semi-circular side 34 connected in sequence. Its shape directly determines the vertical position of the upper movable plate 54 it abuts. The lower side 31 of the upright plate 3 corresponds to the lower straight section 41 of the annular track 4. Its design features include, for example... Figure 4As shown, the vertical distance D from the lower side 31 to the center O of the right semicircular side 34 (or other semicircular side) is greater than the radius R of the right semicircular side 34. This means that when the lower movable plate 54 abuts against the lower side 31, the upper movable plate 54 is in a lower vertical position relative to the center O. Conversely, in the regions of the left semicircular side 32, the upper side 33, and the right semicircular side 34, preferably, the vertical distance from these side profiles to the center O is equal to the radius R (for a straight line segment) or is the same as the radius R (for an arc segment), so that the upper movable plate 54 is in a higher vertical position relative to the center O. This geometric design cleverly achieves automatic control of the hot press plate.

[0045] To achieve reliable power transmission during movement, the conductive structure 8 includes carbon brushes 81 disposed on each slider assembly 5 and conductive sheets 82 disposed on specific areas of the vertical plate 3. The conductive sheet 82 serves as a power track and preferably includes parallel cathode wires 821 and anode wires 822. The conductive sheet 82 is electrically connected to an external power supply. The carbon brushes 81 are electrically connected to the hot-pressing device 6 (specifically, a heating element), and the free end of the carbon brushes 81 is designed to elastically abut against the conductive sheet 82, ensuring good electrical contact throughout the movement of the slider assembly.

[0046] To precisely control the heating timing of the hot pressing device 6, the conductive sheet 82 preferably includes a hot pressing section 8a arranged parallel to the lower straight section 41 of the annular track 4. This means that the carbon brush 81 on the slider assembly 5 will only contact the conductive sheet of the hot pressing section 8a when the slider assembly 5 moves to the lower straight section 41, thereby supplying power to the hot pressing device 6 for heating and sealing.

[0047] Furthermore, to improve heat sealing efficiency, the hot press plate can be preheated before hot pressing. Therefore, the conductive sheet 82 may also include a preheating section 8b arranged parallel to the right semicircular section 44 of the annular track 4. When the slider assembly 5 moves to the right semicircular section 44, its carbon brush 81 contacts the conductive sheet of the preheating section 8b, and the hot pressing device 6 is energized for preheating. When it moves to the lower straight section 41, the hot press plate has reached or is close to the set temperature, and can immediately perform effective sealing, thereby shortening the effective sealing time in the lower straight section 41 or ensuring the sealing quality.

[0048] The main drive device 7 is the power source for realizing the circular motion of the slider assembly. It includes a drive wheel 71 and a drive wheel 72 rotatably connected to the left and right ends of the vertical plate 3. The drive wheel 71 is driven to rotate by a drive motor 73. Connecting the drive wheel 71 and the drive wheel 72 is an infinitely circulating transmission component, which can be a chain 74 or a belt. Each slider assembly 5 is connected to the chain 74 or belt at intervals. The drive motor 73 drives the chain 74 or belt to circulate, thereby driving the slider assembly 5 connected to it to move synchronously and continuously along the circular track 4.

[0049] The working process of this utility model is roughly as follows: The main conveyor belt 2 continuously or intermittently transports the workpiece to be hot-pressed. At the same time, the drive motor 73 drives the chain 74 (or belt), driving all the slider assemblies 5 to continuously circulate along the circular track 4. During equipment installation or adjustment, the operator can rotate the adjustment handwheel 92 to drive the vertical plate 3 and the entire circular track 4 to move laterally on the crossbeam 9, so that the sealing position of the hot pressing plate 61 is precisely aligned with the predetermined sealing line of the workpiece. After the position adjustment is completed, it is locked and fixed. In normal operation, when a slider assembly 5 enters the area of ​​the lower straight section 41 from the right semicircular section 44, if there is a preheating section 8b, the hot pressing plate 61 has already started preheating beforehand. After entering the lower straight section 41, due to the lower profile of the vertical plate 3 31, the upper movable plate 54 descends accordingly, causing the hot pressing plate 61 to contact the workpiece. At the same time, the carbon brush 81 contacts the conductive sheet of the hot pressing section 8a, and the hot pressing device 6 receives continuous power to heat and press the workpiece (the pressure is provided by the second elastic reset member 62). The slider assembly 5 and the workpiece on the main conveyor belt 2 move at the same speed in the lower straight section 41 area, completing the heat sealing. When the slider assembly 5 enters the left semicircular section 42 area from the lower straight section 41, the side profile of the upright plate 3 (left semicircular side 32) gradually rises, pushing the upper movable plate 54 upward and causing the hot pressure plate 61 to detach from the workpiece. In the left semicircular section 42 and the upper straight section 43 area, the hot pressure plate 61 remains in a raised state and does not contact the workpiece. Then, the slider assembly 5 moves to the right semicircular section 44, repeating the cycle. Since multiple slider assemblies 5 are connected to the drive chain at intervals, each slider assembly enters the lower straight section in sequence to start a new heat sealing process, thereby realizing continuous heat sealing of continuously fed workpieces.

[0050] Compared with existing technologies, this invention eliminates the separate reciprocating lifting, pressing, and return mechanisms for each hot press head. The lifting and pressing actions are integrated into the mechanical interaction between the slider assembly and the side profile of the fixed track. Through the continuous movement of multiple hot press heads on the circular track, the entire heat sealing process is made continuous and efficient, greatly improving production efficiency and reducing equipment complexity and maintenance costs. Simultaneously, a convenient and reliable lateral adjustment device is added, improving the equipment's adaptability to different workpieces and its adjustment accuracy.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of this utility model should be included within the scope of protection of this utility model. For example, in addition to manual ball screw pairs, the lateral adjustment device can also employ motor-driven ball screw pairs, hydraulic / pneumatic cylinders in conjunction with guide rails, or other mechanisms capable of lateral translation and positioning; the specific shapes of the annular track and the side of the vertical plate can be adjusted according to actual needs; the conductive structure can also adopt other forms of contact or non-contact power supply; the driving device can also adopt gear rack or linear motor forms, as long as it can realize the continuous annular motion of the slider assembly and the periodic operation of the hot pressing device.

Claims

1. A ring-type continuous heat sealing device, characterized in that: The system includes a frame (1), on which a main conveyor belt (2) for conveying workpieces to be hot-pressed is provided, and a conveyor drive device (21) for driving its operation is provided. A vertical plate (3) is provided above the main conveyor belt (2), and an annular track (4) is provided around the periphery of the vertical plate (3). The annular track (4) includes a lower straight section (41), a left semicircular section (42), an upper straight section (43), and a right semicircular section (44) connected in sequence. Several slider assemblies (5) are slidably connected on the annular track (4). A hot pressing device (6) is provided on the slider assembly (5) to hot-press the workpieces on the main conveyor belt (2) when it moves to the lower straight section (41). A main drive device (7) for driving the slider assembly (5) to slide along the annular track (4) is provided between the slider assembly (5) and the vertical plate (3). A conductive structure (8) for supplying power to the hot pressing device (6) is also provided between the slider assembly (5) and the annular track (4).

2. The ring-type continuous heat sealing device according to claim 1, characterized in that: The slider assembly (5) includes a bracket (51), on which a roller group (52) cooperating with the annular track (4) is rotatably connected. A fixed plate (53) is fixedly connected to the bracket (51), and a liftable upper movable plate (54) is movably connected above the fixed plate (53). The upper surface of the upper movable plate (54) abuts against the side of the upright plate (3). A first elastic reset member (55) that elastically presses the upper movable plate (54) upward is provided between the upper movable plate (54) and the fixed plate (53). A lower movable plate (56) located below the fixed plate (53) is fixedly connected to the upper movable plate (54), and the hot pressing device (6) is provided on the lower movable plate (56).

3. The ring-type continuous heat sealing device according to claim 2, characterized in that: The hot pressing device (6) includes a hot pressing plate (61) that is movably connected to the lower movable plate (56) and can be raised and lowered, and a heating element provided in the hot pressing plate (61). A second elastic reset member (62) for elastically pressing the hot pressing plate (61) downward is provided between the hot pressing plate (61) and the lower movable plate (56).

4. A ring-type continuous heat sealing device according to claim 2, characterized in that: The upper surface of the upper movable plate (54) is rotatably connected to several rollers (541) that abut against the side of the upright plate (3).

5. A ring-type continuous heat sealing device according to claim 2, characterized in that: The side of the upright plate (3) includes a lower side (31), a left semicircular side (32), an upper side (33) and a right semicircular side (34) connected in sequence. The vertical distance D from the lower side (31) of the upright plate (3) to the center O of the right semicircular side (34) is greater than the radius R of the right semicircular side (34).

6. The ring-type continuous heat sealing device according to claim 1, characterized in that: The conductive structure (8) includes carbon brushes (81) on each slider and conductive sheets (82) on the vertical plate (3). The conductive sheet (82) includes parallel cathode wires (821) and anode wires (822). The conductive sheet (82) is electrically connected to a power supply. The carbon brushes (81) are electrically connected to the hot pressing device (6), and the free end of the carbon brushes (81) can elastically abut against the conductive sheet (82).

7. A ring-type continuous heat sealing device according to claim 6, characterized in that: The conductive sheet (82) includes a hot-pressed section (8a) arranged parallel to the lower straight section (41).

8. A ring-type continuous heat sealing device according to claim 7, characterized in that: The conductive sheet (82) also includes a preheating section (8b) arranged parallel to the right semicircular section (44).

9. A ring-type continuous heat sealing device according to claim 1, characterized in that: The main drive device (7) includes a drive wheel (71) and a drive wheel (72) rotatably connected to the left and right ends of the upright plate (3), a drive motor (73) for driving the drive wheel (71) to rotate, and a chain (74) or belt connected between the drive wheel (71) and the drive wheel (72). Each of the slider assemblies (5) is spaced apart on the chain (74) or belt.

10. A ring-type continuous heat sealing device according to claim 1, characterized in that: The frame (1) is also provided with a crossbeam (9), the upright plate (3) is slidably connected to the crossbeam (9) along the transverse direction of the main conveyor belt (2), and the upright plate (3) is provided with a transverse adjustment device for driving its transverse translation.

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