CN109229609B

CN109229609B - Plastic bag sealing device

Info

Publication number: CN109229609B
Application number: CN201811423484.5A
Authority: CN
Inventors: 林庆伟
Original assignee: Haining Yitong Packaging Technology Co ltd
Current assignee: HAINING YITONG PACKAGING TECHNOLOGY Co.,Ltd.
Priority date: 2018-11-27
Filing date: 2018-11-27
Publication date: 2020-11-03
Anticipated expiration: 2038-11-27
Also published as: CN109229609A

Abstract

The invention discloses a heat sealing device for plastic bags, which structurally comprises a heat dissipation port, a base, a heat sealer, a support, a workbench and an operation panel, wherein the heat dissipation port is arranged on the left side of the base and is of an integrated structure, the heat sealer is arranged right above the workbench, the heat sealer is arranged on the left side of the base, the heat sealer is arranged on the right side of the workbench, the heat sealer can be matched with a power supply control assembly when moving downwards by improving part of the structure of equipment, so that the heat sealer can provide power for a heating mechanism, the heat sealer is prevented from being always in a working state, a large amount of power waste is avoided, the service life of the equipment is prolonged, meanwhile, the heat sealer can be matched with a plastic bag sealing clamping mechanism through a leveling mechanism during clamping, so that a plastic bag is tensioned, wrinkles on the seal of the plastic bag are removed, and the wrinkles of a plastic belt, affecting the production quality of the equipment.

Description

Plastic bag sealing device

Technical Field

The invention relates to the field of plastic belt heat sealing equipment, in particular to a plastic bag heat sealing device.

Background

Plastic bag sealing device, be a mechanical equipment who carries out the heat-seal to the plastics sack, its security is high stability is strong, but current equipment is when carrying out the heat-seal, because the plastics sack is when the transportation dress is put, the fold phenomenon easily appears in the subregion, lead to in hot pressing sealing strip, the fold part is also sealed by hot pressing together, thereby the production quality of equipment has been influenced, current equipment is convenient for work simultaneously, the sealing head on the heat-seal machine often is in the mode of opening always, this method can make work more convenient, but need consume a large amount of powers, be in the state of heating work simultaneously always, also bigger to the wearing and tearing of equipment.

Disclosure of Invention

Aiming at the defects of the prior art, the invention is realized by the following technical scheme: a plastic bag heat sealing device structurally comprises a heat dissipation port, a base, a heat sealer, a support, a workbench and an operation panel, wherein the heat dissipation port is arranged on the left side of the base and is of an integrated structure, the heat sealer is arranged right above the workbench and is embedded and installed on the support, the bottom end of the support and the top end of the base are welded, the operation panel is arranged at the front end of the base and is electrically connected with the base, the workbench is arranged at the top end of the base and is of an integrated structure, the heat sealer comprises a leveling mechanism, a plastic bag sealing clamping mechanism, a heating mechanism, a telescopic assembly, a power supply control assembly and a shell, the bottom end of the plastic bag sealing clamping mechanism is arranged on the left side and the right side of the top end of the leveling mechanism and is welded with the plastic bag sealing clamping mechanism, and the plastic bag sealing clamping mechanism is arranged right below the heating mechanism, the heating mechanism is located under the power control assembly, and the top end of the telescopic assembly is welded with the top end of the shell.

As a further optimization of this technical scheme, the mechanism of leveling is including connecting straight piece, connection socket, rotation wheel, return pulley, backup pad, connect the bottom of straight piece locating rotation wheel to the two swing joint, connect socket locate on the outer lane of rotation wheel to the two is the integral structure, it locates on the return pulley to rotate the wheel, and the two welds mutually, the return pulley is located the rear of connecting straight piece, the backup pad is located directly over connecting straight piece).

As a further optimization of the technical scheme, the plastic bag sealing and clamping mechanism comprises a pressing mechanism and a clamping mechanism, the right end of the bottom of the pressing mechanism is movably connected with the left end of the clamping mechanism, the pressing mechanism comprises a sliding sleeve, a pressing valve block, a downward pressing straight rod, a spring and a driven wheel, the sliding sleeve is arranged on the downward pressing straight rod in a surrounding manner and is movably connected with the downward pressing straight rod, the bottom end of the pressing valve block is welded with the top end of the downward pressing straight rod, the spring is arranged on the downward pressing straight rod in a surrounding manner, the left end of the driven wheel is movably connected with the right end of the downward pressing straight rod, the clamping mechanism comprises a limiting spring, a vertical rod, a movable clamping block, a latch and a fixed clamping block, the limiting spring is arranged on the vertical rod in a surrounding manner and is movably connected with the vertical rod, the bottom end of the vertical rod is welded with the top end, the clamping teeth are movably connected with the vertical rod, the fixed clamping block is located under the clamping teeth, the movable clamping block is located above the fixed clamping block, and the movable clamping block and the fixed clamping block are movably connected.

As the further optimization of this technical scheme, heating mechanism includes the electromagnetism connecting block, connects electric block, heating rod, winding, heating panel, holding down plate, the electromagnetism connecting block is located the heating rod about both ends to the two welds mutually, the heating rod is located the heating panel directly over, the winding encircles and installs on the heating rod and laminate mutually, the top of heating panel welds mutually with the bottom of electromagnetism connecting block, the electromagnetism connecting block is located the holding down plate directly over, the heating rod is located the holding down plate directly over, the top of holding down plate is located on the bottom of heating panel to the two structure as an organic whole, the heating rod is located the centre of flexible subassembly.

As a further optimization of the technical scheme, the telescopic assembly comprises a starting module, a telescopic rod sleeve and a telescopic rod, the bottom end of the starting module is provided with the top end of the telescopic rod sleeve, the two are of an integrated structure, the top end of the telescopic rod is perpendicularly embedded into the middle of the bottom end of the telescopic rod sleeve, the telescopic rod is perpendicularly embedded into the starting module, and a heating rod is arranged in the middle of the telescopic rod.

As the further optimization of this technical scheme, power control assembly includes power connection subassembly, moves down mechanism, protecting crust, power connection subassembly's middle part is equipped with moves down the mechanism to the two swing joint, move down the middle part of mechanism perpendicular embedding in protecting crust, power connection subassembly's top welds mutually with the top of protecting crust.

As a further optimization of this technical scheme, power coupling assembling is including removing straight rack bar, joint pole, power module, horizontal translation valve block, conductive ball, connecing electric ball, power connection head, guide rail, it locates on the guide rail to remove straight rack bar to the two swing joint, the bottom of power module is equipped with conductive ball to the two electricity is connected, the middle part of horizontal translation valve block is equipped with the left end of joint pole, and the two hinged joint, the right-hand member of joint pole is located the left end middle part of removing straight rack bar to the two swing joint, it is located the right-hand of horizontal translation valve block to remove straight rack bar, connect the right-hand power connection head that is equipped with of electric ball, and the two activity is touched, connect the left end that the electric ball located horizontal translation valve block to the two welds mutually, power connection head is located under the conductive ball to the two electricity is connected.

As the further optimization of the technical scheme, the downward moving mechanism comprises a lower pull rod, a driven gear, a roller connecting block and a guide wheel, the lower pull rod is arranged at the left end of the driven gear and is movably connected with the driven gear, the driven gear is positioned right above the guide wheel, and the guide wheel is embedded and installed on one side, close to the middle part, of the roller connecting block and is movably connected with the roller connecting block.

Advantageous effects

The invention relates to a plastic bag heat-sealing device, which controls a heat sealer to work through an operation panel when equipment is used, a lower pressing straight rod moves downwards by pressing a pressing valve block on a plastic bag sealing clamping mechanism, the lower pressing straight rod is matched with a driven wheel under the buffer of a spring, the driven wheel moves upwards with a moving clamping block on the clamping mechanism, the plastic tape sealing corner can be placed on a fixed clamping block, the pressing valve block interface is released to clamp the plastic tape sealing corner, simultaneously, a rotating wheel on a leveling mechanism is rotated to be matched with a connecting straight block to pull the plastic bag sealing to move outwards so as to level, when a heating mechanism is driven by a starting module on a telescopic assembly to drive a telescopic rod to push downwards, a lower pull rod on a power supply control assembly is matched with a driven gear, so that the driven gear rotates to be matched with a moving straight-tooth rod to enable the moving straight-tooth rod to move upwards, the horizontal translation on the pulling joint pole moves the valve block to make the horizontal translation valve block drive the electricity ball on it and remove, thereby be connected with electrically conductive ball, power module supplies power for connecting the head through electrically conductive ball, thereby makes heating mechanism move when pushing down to the least significant end.

Based on the prior art, the invention can ensure that the telescopic component can be matched with the power supply control component when moving downwards by improving part of the structure of the equipment, so that the telescopic component can provide power for the heating mechanism, thereby avoiding that a heat sealer is always in a working state, causing a large amount of power waste and prolonging the service life of the equipment to be worn.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural view of a heat sealing device for plastic bags according to the present invention.

FIG. 2 is a schematic cross-sectional view of the heat sealer of the present invention before operation.

Fig. 3 is a schematic cross-sectional view of the heat sealer of the present invention after operation.

Fig. 4 is a schematic cross-sectional structure of the plastic bag closure clamping mechanism of the present invention before operation.

Fig. 5 is a schematic cross-sectional view showing the plastic bag closure clamping mechanism of the present invention after operation.

Fig. 6 is a schematic cross-sectional view of a power control assembly according to the present invention before operation.

FIG. 7 is a schematic cross-sectional view of a power control module according to the present invention after operation

In the figure: a heat dissipation port-1, a base-2, a heat sealer-3, a support-4, a workbench-5, an operation panel-6, a leveling mechanism-31, a plastic bag sealing clamping mechanism-32, a heating mechanism-33, a telescopic component-34, a power supply control component-35, a shell-36, a connecting straight block-311, a connecting socket-312, a rotating wheel-313, a bottom wheel-314, a supporting plate-315, a pressing mechanism-321, a clamping mechanism-322, a sliding sleeve-3211, a pressing valve block-3212, a downward pressing straight rod-3213, a spring-3214, a driven wheel-3215, a limiting spring-3221, a vertical rod-3222, a movable clamping block-3223, a latch-3224, a fixed clamping block-3225, an electromagnetic connecting block-331, an electromagnetic connecting block-3223, a movable clamping block-3224, a fixing, The device comprises an electric connection block-332, a heating rod-333, a winding resistor-334, a heat dissipation plate-335, a lower pressing plate-336, a starting module-341, a telescopic rod sleeve-342, a telescopic rod-343, a power supply connection assembly-351, a downward moving mechanism-252, a protective shell-353 moving straight toothed bar-3511, an engagement rod-3512, a power supply module-3513, a horizontal moving valve block-3514, a conductive ball-3515, an electrical ball-3516, an electrical connector-3517, a guide rail-3518, a lower pull rod-3521, a driven gear-3522, a roller connection block-3523 and a guide wheel-3524.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the following description and the accompanying drawings further illustrate the preferred embodiments of the invention.

Examples

Referring to fig. 1-7, the present invention provides a heat sealing device for plastic bags, which comprises a heat dissipating port 1, a base 2, a heat sealer 3, a support 4, a workbench 5, and an operating panel 6, wherein the heat dissipating port 1 is disposed on the left side of the base 2, and the two are integrated, the heat sealer 3 is disposed right above the workbench 5, the heat sealer 3 is embedded in the support 4, the bottom end of the support 4 is welded to the top end of the base 2, the operating panel 6 is disposed at the front end of the base 2 and electrically connected to the same, the workbench 5 is disposed at the top end of the base 2, and the two are integrated, the heat sealer 3 comprises a leveling mechanism 31, a plastic bag seal clamping mechanism 32, a heating mechanism 33, a telescopic assembly 34, a power control assembly 35, and a housing 36, the bottom ends of the plastic bag seal clamping mechanisms 32 are disposed on the left and right sides of the top end of the leveling mechanism 31, the plastic bag sealing clamping mechanism 32 is located under the heating mechanism 33, the heating mechanism 33 is located under the power control assembly 35, the top end of the telescopic assembly 34 is welded with the top end of the outer shell 36, the leveling mechanism 31 comprises a connecting straight block 311, a connecting socket 312, a rotating wheel 313, a bottom wheel 314 and a supporting plate 315, the connecting straight block 311 is arranged at the bottom end of the rotating wheel 313 and movably connected with the rotating wheel 313, the connecting socket 312 is arranged on the outer ring of the rotating wheel 313 and is of an integrated structure, the rotating wheel 313 is arranged on the bottom wheel 314 and is welded with the bottom wheel, the bottom wheel 314 is located behind the connecting straight block 311, the supporting plate 315 is located right above the connecting straight block 311), the plastic bag sealing clamping mechanism 32 comprises a pressing mechanism 321 and a clamping mechanism 322, the right end of the bottom of the pressing mechanism 321 is movably connected with the left end of the clamping mechanism 322, the pressing mechanism 321 includes a sliding sleeve 3211, a pressing valve block 3212, a lower pressing straight rod 3213, a spring 3214, and a driven wheel 3215, the sliding sleeve 3211 is mounted around the lower pressing straight rod 3213 and movably connected to the lower pressing straight rod 3213, the bottom end of the pressing valve block 3212 is welded to the top end of the lower pressing straight rod 3213, the spring 3214 is mounted around the lower pressing straight rod 3213, the left end of the driven wheel 3215 is movably connected to the right end of the lower pressing straight rod 3213, the clamping mechanism 322 includes a limiting spring 3221, a vertical rod 3222, a movable clamping block 3223, a latch 3224, and a fixed clamping block 3225, the limiting spring 3221 is mounted around the vertical rod 3222 and movably connected to the vertical rod 3222, the bottom end of the vertical rod 3222 is welded to the top end of the movable clamping block 3223, the latch 3224 is disposed at the bottom end of the movable clamping block 3223 and movably connected to the fixed clamping block 3225, the latch 3224 is disposed directly below the vertical rod 3222, the movable clamping block 3223 is located right above the fixed clamping block 3225 and is movably connected with the fixed clamping block 3225, the heating mechanism 33 includes an electromagnetic connecting block 331, an electric connection block 332, a heating rod 333, a winding 334, a heat dissipation plate 335 and a lower pressing plate 336, the electromagnetic connecting block 331 is located at the left end and the right end of the heating rod 333 and welded to the electromagnetic connecting block, the heating rod 333 is located right above the heat dissipation plate 335, the winding 334 is mounted on the heating rod 333 in a surrounding manner and attached to the heating rod, the top end of the heat dissipation plate 335 is welded to the bottom end of the electromagnetic connecting block 331, the electromagnetic connecting block 331 is located right above the lower pressing plate 336, the heating rod 333 is located right above the lower pressing plate 336, the top end of the lower pressing plate 336 is located at the bottom end of the heat dissipation plate 335 and is of an integrated structure, the heating rod 333 is located in the middle of the telescopic assembly, The power supply control device comprises a telescopic rod sleeve 342 and a telescopic rod 343, the bottom end of the starting module 341 is provided with the top end of the telescopic rod sleeve 342, the telescopic rod 343 is vertically embedded in the middle of the bottom end of the telescopic rod sleeve 342, the middle of the telescopic rod 343 is provided with a heating rod 333, the power supply control assembly 35 comprises a power supply connecting assembly 351, a downward moving mechanism 252 and a protective shell 353, the middle of the power supply connecting assembly 351 is provided with the downward moving mechanism 252 which is movably connected with the downward moving mechanism 252, the downward moving mechanism 252 is vertically embedded in the middle of the protective shell 353, the top end of the power supply connecting assembly 351 is welded with the top end of the protective shell 353, the power supply connecting assembly 351 comprises a moving straight toothed rod 3511, a connecting rod 3512, a power supply module 3513, a horizontal moving valve block 3514, a conductive ball 3515, a power connecting ball 3516, a power connecting head 3517, a, A guide rail 3518, the moving straight gear 3511 is disposed on the guide rail 3518 and movably connected with the guide rail 3518, the bottom end of the power supply module 3513 is provided with a conductive ball 3515 and electrically connected with the conductive ball 3515, the middle of the horizontal moving valve block 3514 is provided with the left end of an engaging rod 3512 and hinged with the engaging rod, the right end of the engaging rod 3512 is disposed in the middle of the left end of the moving straight gear 3511 and movably connected with the movable ball 3511, the moving straight gear 3511 is located at the right of the horizontal moving valve block 3514, the right of the engaging ball 3516 is provided with an engaging head 3517 and movably touched with the engaging head, the engaging ball 3516 is disposed at the left end of the horizontal moving valve block 3514 and welded with the engaging head, the engaging head 3517 is located right under the conductive ball 3515 and electrically connected with the conductive ball 3515, the downward moving mechanism 252 comprises a lower pull rod 3521, a driven gear 3522, a roller connecting block 3523, a guide wheel 3524, the lower pull rod 35, and the driven gear 3522 is positioned right above the guide wheel 3524, the guide wheel 3524 is embedded and installed at one side of the roller connecting block 3523 close to the middle part, and the driven gear 3522 and the guide wheel are movably connected.

The principle of the invention is as follows: when the device is used, the operation panel 6 is used for controlling the heat sealer 3 to work, the pressing valve block 3212 on the plastic bag sealing clamping mechanism 32 is pressed to enable the lower pressing rod 3213 to move downwards, the spring 3214 buffers the pressing valve block so as to enable the pressing valve block to be matched with the driven wheel 3215, the driven wheel 3215 and the moving clamping block 3223 on the clamping mechanism 322 are enabled to move upwards, the plastic bag sealing edge can be placed on the fixed clamping block 3225, the pressing valve block 3212 interface is released to clamp the plastic bag sealing edge, meanwhile, the rotating wheel 313 on the leveling mechanism 31 is rotated to be matched with the connecting straight block 311, the plastic bag sealing edge is pulled to move outwards, so as to level, when the heating mechanism 33 is driven by the starting module 341 on the telescopic component 34 to drive the telescopic rod 343 to push downwards, the lower pull rod 3521 on the power control component 35 is matched with the driven gear 3522, so as to enable the driven gear 3522 to rotate to be matched with the, the movable straight-tooth rod 3511 is moved upwards, the horizontal movable valve block 3514 on the connecting rod 3512 is pulled to move, so that the horizontal movable valve block 3514 drives the electric connecting ball 3516 on the horizontal movable valve block to move, and the horizontal movable valve block 3514 is connected with the electric conducting ball 3515, the power supply module 3513 supplies power to the electric connecting head 3517 through the electric conducting ball 3515, and the heating mechanism 33 operates when being pressed to the lowest end.

The invention solves the problem that when the existing equipment is used for heat sealing, because the plastic bag opening is transported and placed, a part of area is easy to have a wrinkle phenomenon, so that when a sealing belt is hot-pressed, the wrinkle part is also hot-pressed and sealed, thereby influencing the production quality of the equipment, meanwhile, in order to facilitate the work of the existing equipment, a heat sealing head on a heat sealing machine is always in a mode of being opened, although the method can facilitate the work, but needs to consume a large amount of power, and is always in a heating working state, so that the abrasion to the equipment is larger, through the mutual combination of the parts, the invention can lead a telescopic component to be matched with a power control component when moving downwards by improving the partial structure of the equipment, thus leading the telescopic component to provide power for a heating mechanism and avoiding the heat sealing machine from being always in a working state, thereby caused a large amount of electric power extravagant, and the life wearing and tearing of the equipment that increases, simultaneously in the clamping, can seal clamping mechanism with the plastic bag through flattening mechanism and cooperate to take-up the plastic bag, got rid of the fold that the plastic bag sealed, thereby avoided when pushing down the heat-seal, the plastic tape fold department pressfitting is in the same place, influences the production quality of equipment.

While there have been shown and described what are at present considered the fundamental principles of the invention, the essential features and advantages thereof, it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but rather, is capable of numerous changes and modifications in various forms without departing from the spirit or essential characteristics thereof, and it is intended that the invention be limited not by the foregoing descriptions, but rather by the appended claims and their equivalents.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a plastic bag sealing device, its structure includes thermovent (1), base (2), heat sealer (3), support (4), workstation (5), operating panel (6), draw together thermovent (1) and locate the left side of base (2) to the two is integrated structure, heat sealer (3) are located workstation (5) directly over, heat sealer (3) embedding is installed on support (4), the top looks welded joint of the bottom of support (4) and base (2), the front end of base (2) is located in operating panel (6), and the two electricity is connected, the top of base (2) is located in workstation (5) to the two is integrated structure, its characterized in that: the heat sealer (3) comprises a leveling mechanism (31), a plastic bag sealing clamping mechanism (32), a heating mechanism (33), a telescopic assembly (34), a power supply control assembly (35) and a shell (36), wherein the left side and the right side of the top end of the leveling mechanism (31) are provided with the bottom ends of the plastic bag sealing clamping mechanism (32) and welded with the plastic bag sealing clamping mechanism, the plastic bag sealing clamping mechanism (32) is located under the heating mechanism (33), the heating mechanism (33) is located under the power supply control assembly (35), and the top end of the telescopic assembly (34) is welded with the top end of the shell (36);

the leveling mechanism (31) comprises a connecting straight block (311), a connecting socket (312), a rotating wheel (313), a bottom wheel (314) and a supporting plate (315), wherein the connecting straight block (311) is arranged at the bottom end of the rotating wheel (313) and movably connected with the rotating wheel and the rotating wheel, the connecting socket (312) is arranged on the outer ring of the rotating wheel (313), the rotating wheel and the bottom wheel are of an integrated structure, the rotating wheel (313) is arranged on the bottom wheel (314) and welded with each other, the bottom wheel (314) is positioned behind the connecting straight block (311), and the supporting plate (315) is positioned right above the connecting straight block (311);

the heating mechanism (33) comprises an electromagnetic connecting block (331), an electric connecting block (332), a heating rod (333), a winding (334), a heat dissipation plate (335) and a lower pressing plate (336), the electromagnetic connecting block (331) is arranged at the left end and the right end of the heating rod (333), and the heating rod (333) is positioned right above the heat dissipation plate (335), the winding (334) is arranged around the heating rod (333) and is jointed with the heating rod, the top end of the heat dissipation plate (335) is welded with the bottom end of the electromagnetic connecting block (331), the electromagnetic connecting block (331) is positioned right above the lower pressure plate (336), the heating rod (333) is positioned right above the lower pressure plate (336), the top end of the lower pressure plate (336) is arranged on the bottom end of the heat dissipation plate (335), the heating rod (333) is positioned in the middle of the telescopic component (34);

the telescopic assembly (34) comprises a starting module (341), a telescopic rod sleeve (342) and a telescopic rod (343), the bottom end of the starting module (341) is provided with the top end of the telescopic rod sleeve (342), the starting module and the telescopic rod sleeve are of an integrated structure, the top end of the telescopic rod (343) is vertically embedded in the middle of the bottom end of the telescopic rod sleeve (342), the telescopic rod (343) is vertically embedded in the starting module (341), and the middle of the telescopic rod (343) is provided with a heating rod (333);

the power supply control assembly (35) comprises a power supply connecting assembly (351), a downward moving mechanism (252) and a protective shell (353), the downward moving mechanism (252) is arranged in the middle of the power supply connecting assembly (351) and is movably connected with the power supply connecting assembly, the downward moving mechanism (252) is vertically embedded in the middle of the protective shell (353), and the top end of the power supply connecting assembly (351) is welded with the top end of the protective shell (353);

the power supply connection assembly (351) comprises a movable straight toothed rod (3511), an attachment rod (3512), a power supply module (3513), a horizontal movable valve block (3514), a conductive ball (3515), a power connection ball (3516), a power connection head (3517) and a guide rail (3518), wherein the movable straight toothed rod (3511) is arranged on the guide rail (3518) and movably connected with the two, the bottom end of the power supply module (3513) is provided with the conductive ball (3515) and electrically connected with the conductive ball, the middle part of the horizontal movable valve block (3514) is provided with the left end of the attachment rod (3512) and hinged with the two, the right end of the attachment rod (3512) is arranged in the middle part of the left end of the movable straight toothed rod (3511) and movably connected with the left end, the movable straight toothed rod (3511) is arranged on the right side of the horizontal movable valve block (3514), the power connection head (3517) is arranged on the right side of the power connection ball (3516) and is touched with the power connection ball (3516), the two are welded, the electric connector (3517) is positioned right below the conductive ball (3515), and the two are electrically connected;

the downward moving mechanism (252) comprises a downward pull rod (3521), a driven gear (3522), a roller connecting block (3523) and a guide wheel (3524), wherein the downward pull rod (3521) is arranged at the left end of the driven gear (3522) and movably connected with the driven gear, the driven gear (3522) is positioned right above the guide wheel (3524), and the guide wheel (3524) is embedded in one side, close to the middle, of the roller connecting block (3523) and movably connected with the roller connecting block.

2. The heat-sealing apparatus for plastic bags according to claim 1, wherein: the plastic bag sealing and clamping mechanism (32) comprises a pressing mechanism (321) and a clamping mechanism (322), the right end of the bottom of the pressing mechanism (321) is movably connected with the left end of the clamping mechanism (322), the pressing mechanism (321) comprises a sliding sleeve (3211), a pressing valve block (3212), a downward pressing straight rod (3213), a spring (3214) and a driven wheel (3215), the sliding sleeve (3211) is mounted on the downward pressing straight rod (3213) in a surrounding manner and movably connected with the downward pressing straight rod, the bottom end of the pressing valve block (3212) is welded with the top end of the downward pressing straight rod (3213), the spring (3214) is mounted on the downward pressing straight rod (3213) in a surrounding manner, the left end of the driven wheel (3215) is movably connected with the right end of the downward pressing straight rod (3213), the clamping mechanism (322) comprises a limiting spring (3221), a vertical rod (3222), a movable clamping block (3223), a latch (3224) and a fixed clamping block (322, the limiting spring (3221) is arranged on the vertical rod (3222) in a surrounding mode and movably connected with the vertical rod (3222), the bottom end of the vertical rod (3222) is welded to the top end of the movable clamping block (3223), the latch (3224) is arranged at the bottom end of the movable clamping block (3223) and movably connected with the movable clamping block, the latch (3224) is located under the vertical rod (3222), the fixed clamping block (3225) is located under the latch (3224), and the movable clamping block (3223) is located over the fixed clamping block (3225) and movably connected with the fixed clamping block (3225).