CN212606243U

CN212606243U - Sealing equipment for health-care product plastic packaging bag

Info

Publication number: CN212606243U
Application number: CN202021315377.3U
Authority: CN
Inventors: 王云华; 戴小燕; 李少东; 陈瑛
Original assignee: Shanghai Tongji Biological Product Co ltd
Current assignee: Shanghai Tongji Biological Product Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-02-26
Anticipated expiration: 2030-07-07

Abstract

A sealing device for plastic packaging bags of health care products comprises a frame, an electric conveying device, a movable heating mechanism, a voltage-stabilized power supply and a control circuit; the electric conveying equipment is arranged on the frame, and the front side and the rear side of the upper end of the frame are respectively provided with a baffle; the movable heating mechanisms are provided with a plurality of same sets, each set comprises an electric telescopic rod, a heating shell, a heating plate and a temperature switch, the heating plate is arranged in the heating shell, the temperature switch is arranged at the outer side end of the heating shell, the front end of a plunger rod of the electric telescopic rod is connected with the rear outer side end of the heating shell, and a barrel body of the electric telescopic rod is arranged at the rear upper end of the rack; the rear side baffle at the upper end of the rack is transversely provided with an open slot, and the heating shell is positioned at the rear side end of the open slot; the control circuit comprises a photoelectric switch and a trigger sub-circuit, and the photoelectric switch is arranged on one side of one baffle of the rack; the electric heating plates, the trigger sub-circuit, the electric conveying equipment and the photoelectric switch of the plurality of sets of movable heating mechanisms are electrically connected. This is novel to have improved work efficiency.

Description

Sealing equipment for health-care product plastic packaging bag

Technical Field

The utility model relates to the technical field of packaging equipment, especially a sealing equipment for health supplies plastic packaging bag.

Background

In the production of liquid or solid health products, the plastic bag package has low cost, good sealing effect, portability and more applications. After the health-care products are packaged in the plastic bag, the bag opening of the plastic bag needs to be heated and sealed by electric heating sealing equipment. The small electric heating sealing equipment is low in cost, convenient to use and widely applied to health care product manufacturers with small scale. The existing small-sized electric heating sealing equipment generally seals the bag opening at the front end of a plastic bag in a flat state due to structural limitation (workers hold the rear ends of two sides of the plastic bag by hands and place the bag opening at the heating sealing position of the small-sized electric heating sealing equipment for heating sealing), and the sealing method can achieve good sealing effect on solid health care products and the like, but the front end sealing position of the liquid health care products and the like can easily cause liquid to leak out of the bag if the liquid in the bag is more and flatly placed, so that the application has defects. The other point is that when the plastic bag is sealed, the electric heating sealing device can only heat and seal one plastic bag each time, so that the working efficiency is relatively low.

SUMMERY OF THE UTILITY MODEL

Because of the structure limit, can only once seal a plastic packaging bag's sack in order to overcome current small-size electrical heating sealing equipment, cause work efficiency to hang down to seal the drawback that has the liquid that leads to spilling in from the bag to liquid health products wrapping bag, the utility model provides a compact structure, convenient to use once can seal a plurality of bags in the perpendicular plastic food packaging bag of putting, have improved work efficiency to a sealing equipment for health products plastic packaging bag that spills in the bag has been prevented such as liquid health products.

The utility model provides a technical scheme that its technical problem adopted is:

a sealing device for plastic packaging bags of health care products comprises a frame and an electric conveying device, and is characterized by also comprising a movable heating mechanism, a voltage-stabilized power supply and a control circuit; the electric conveying equipment is arranged on the rack, and the front side and the rear side of the upper end of the rack are respectively provided with a baffle; the movable heating mechanisms are provided with a plurality of same sets, each set comprises an electric telescopic rod, a heating shell, a heating plate and a temperature switch, the heating plate is arranged in the heating shell, the temperature switch is arranged at the outer side end of the heating shell, the front end of a plunger rod of the electric telescopic rod is connected with the rear outer side end of the heating shell, and the electric telescopic rod barrels of the plurality of sets of movable heating mechanisms are arranged at the rear upper end of the rack; the rear side baffle at the upper end of the rack is transversely provided with an open slot, and the heating shells of the plurality of sets of movable heating mechanisms are transversely and linearly distributed at the rear side end of the open slot; the control circuit comprises a photoelectric switch and a trigger sub-circuit, and the photoelectric switch is arranged on one side of one baffle plate in the rack; the power input ends of the electric heating plates of the plurality of sets of movable heating mechanisms are electrically connected with one end of a temperature switch, and the other end of the temperature switch, the other end of the power input end of the electric heating plates and two poles of an alternating current power supply are respectively electrically connected; the stabilized voltage supply and the trigger sub-circuit are arranged in the element box; the two ends of the power output of the voltage-stabilized power supply are respectively and electrically connected with the two ends of the power input of the trigger sub-circuit, and the two ends of the power output of the trigger sub-circuit are respectively and electrically connected with the two ends of the power input of the photoelectric switch; the output ends of two paths of control power supplies of the trigger sub-circuit are respectively and electrically connected with the positive and negative poles and the negative and positive poles of the power supply input ends of the electric telescopic rods of the plurality of sets of movable heating mechanisms; one pole of the alternating current power supply is electrically connected with the input end of the alternating current control power supply of the trigger sub-circuit, and the output end of the alternating current control power supply of the trigger sub-circuit, the other pole of the alternating current power supply and the two ends of the power supply input of the electric conveying equipment are respectively and electrically connected.

Further, the distance between the two baffles at the upper end of the rack is larger than the front and back thickness of the plastic packaging bag.

Further, the electric heating plate of each set of movable heating mechanism is a PTC electric heating plate.

Furthermore, the internal contact of the temperature switch of each set of movable heating mechanism is normally open.

Further, the stabilized voltage supply is an alternating current to direct current switching power supply module.

Further, the photoelectric switch of the control circuit is a reflective photoelectric switch.

Furthermore, the trigger sub-circuit of the control circuit comprises relays, time control switches and power switches, wherein the relays, the time control switches and the power switches are connected through circuit board wiring, the positive and negative pole power input ends of a first relay are respectively connected with the power output end and the negative pole power input end of a photoelectric switch through leads, one end of the first power switch is connected with the positive pole power input end of a first set of time control switches, the other end of the first power switch is connected with one end of a second power switch and the positive pole control power input end of a second relay, the positive pole power output end of the first set of time control switches is connected with the positive pole power input end of the second relay, the negative pole power output end and the negative pole power input end of the first set of time control switches are connected with the negative pole and negative pole control power input ends of the second relay, two normally closed contact ends of the second relay are respectively, the other end of the second power switch is connected with the positive power input end of the photoelectric switch.

This novel beneficial effect is: this novel compact structure, convenient to use. When in work, the two sets of motor reducing mechanisms drive the plastic bagged health care products on the conveying belt to move towards the right side, when the upper end of the conveying belt is full of the bagged health care products which are vertically distributed and the detecting head of the photoelectric switch is shielded, an operator presses the power switch, under the action of the control circuit, the multiple sets of electric telescopic rods can push the multiple sets of electric heating shells to move forwards to press and heat the upper end sealing parts of the multiple plastic packaging bags, so that the upper end sealing parts of the multiple plastic bags are simultaneously hot-pressed together to achieve the effect of simultaneously heating and sealing the upper ends of the multiple plastic packaging bags, after a period of time, many sets of electric telescopic handle drive many sets of electrical heating shell towards the motion recovery normal position of back, and operating personnel closes switch, and a plurality of plastic bags of conveyer belt after will sealing are exported to the food box in etc. can seal the operation again to a plurality of plastic packaging bag upper ends of next batch simultaneously. This is novel once can be in the plastic food package bag of putting perpendicularly to a plurality of bags and seal, has improved work efficiency, because, the interval is only than about the plastic bag front and back end is wide 5mm between two baffle inboards around, the plastic bag can not collapse, has prevented that liquid health products etc. from spilling in the bag. Based on the above, this is novel has good application prospect.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the movable heating mechanism of the present invention.

Fig. 3 is a circuit diagram of the present invention.

Detailed Description

As shown in figures 1 and 2, the sealing device for the plastic packaging bags of the health care products comprises a rack 1 and an electric conveying device, wherein the electric conveying device comprises two sets of motor reducing mechanisms 21, rollers 22 and a conveying belt 23, the two sets of motor reducing mechanisms 21 are respectively installed at the left and right parts of the upper rear outer side end of a rectangular support 1 through screw nuts, a belt roller 211 is respectively arranged in front of a power output shaft of each of the two sets of motor reducing mechanisms 21, the two belt rollers 211 are positioned at the inner sides between the front and the rear parts of the upper end and the left and the right parts of the rack 1, the annular conveying belt 23 is sleeved at the outer side ends of the two belt rollers 211, bearing seats 221 at the front and the rear ends of the four rollers 22 are respectively installed at the front and the rear inner sides of the rack 1 through the screw nuts at intervals from left to right, the upper and the lower ends of the four, The belt 23 is positioned between the front inner side and the rear inner side of the upper end of the frame 1, the front side ends of the two belt rollers 211 are respectively sleeved with a bearing seat 2111, the two bearing seats 2111 are arranged on the left side and the right side of the front inner side of the frame 1 through screw nuts, and the four rollers 22 are positioned between the two belt rollers 211; the device is also provided with a movable heating mechanism 3, a stabilized voltage power supply 4 and a control circuit 5; the front side and the rear side of the upper end of the rack 1 are respectively provided with a rectangular baffle 6, and the upper side and the left side and the right side of the upper end of the rack 1 are of an open structure (a conveying belt is positioned between the inner sides of the front baffle 6 and the rear baffle 6 at the upper end of the rack); the movable heating mechanisms 3 are provided with three sets of the same movable heating mechanisms, each set comprises an electric telescopic rod 31, a rectangular heating shell 32, four PTC ceramic heating plates 33 and a temperature switch 34, the four PTC ceramic heating plates 33 are transversely arranged in the heating shell 32, the temperature switch 34 is arranged in the middle of the rear side end of the heating shell 32 through screw nuts, the temperature sensing head of the temperature switch 34 is tightly attached to the rear outer side end of the heating shell 32, a flange plate at the front end of a plunger rod of the electric telescopic rod 31 and a flange plate in the middle of the rear outer side end of the heating shell 32 are connected together through the screw nuts, the electric telescopic rod 31 barrel bodies of the three sets of the movable heating mechanisms are arranged at the upper end of an ┙ -shaped bracket 35, and the front lower ends of the three brackets 35 are longitudinally distributed; the upper part of the rear side baffle at the upper end of the rack 1 is transversely provided with a rectangular open slot 101, the heating shells 32 of the three sets of movable heating mechanisms are transversely and linearly distributed at the rear side end of the open slot 101, the three heating shells 101 are separated by a minimum distance (1mm), the upper and lower heights of the three heating shells 101 are lower than the height (2mm) of the open slot 101, and the transverse length formed by the three heating shells 101 is slightly smaller than the transverse length 3mm of the open slot 101; the control circuit comprises a photoelectric switch 51 and a trigger sub-circuit 52, the photoelectric switch 51 is installed in the middle of the right side end of the baffle plate 6 at the front end of the rack, and the front end of a detection head of the photoelectric switch and the inner side of the baffle plate 6 are transversely in a linear state. The distance between the two baffles 6 at the upper end of the rack is slightly larger than the front and back thickness of the plastic packaging bag by 5 mm. The stabilized voltage power supply 4 and the trigger sub-circuit 52 are arranged on a circuit board in the element box 7, and the element box 7 is arranged in the middle of the front side end of the machine frame 1.

As shown in figures 1, 2 and 3, two sets of motor reducing mechanisms M are finished motor gear reducers with models of 220V/1KW, when the motor reducing mechanism works, power output by an internal motor is reduced by a multi-stage reducing gear in a shell body to increase torque and then is output from a power output shaft and a belt roller 211, and the power output rotates at 120 revolutions per minute. The model of the PTC electric heating plate RT of each set of movable heating mechanism is 220V/250 degrees, the power is 100W, and four PTC electric heating plates RT are arranged in each heating shell of each set of movable heating mechanism. The temperature switch of each set of movable heating mechanism is an adjustable liquid expansion type temperature controller with W type TS-030SRT, the internal contact of the temperature switch is normally open, the temperature switch is provided with an adjusting knob, the temperature range can be adjusted between 0 and 320 ℃, and the two internal contacts of the temperature sensing head are opened when the temperature sensing head senses the temperature reaching the adjusting set temperature. The electric telescopic rod M1 of each set of movable heating mechanism is a PXTL model, a finished product of an electric push rod with working voltage direct current of 12V is obtained, the electric push rod M1 comprises a motor and a multistage reduction gear inside a cylinder body, when the electric telescopic rod works, after positive and negative poles of the motor are electrified, under the action of the reduction gear and the like, a plunger push rod of the electric push rod M1 can move forwards, the stroke is 20mm, after negative and positive poles of the motor are electrified, under the action of the reduction gear and the like, the plunger push rod of the electric push rod M1 can move backwards, a limit switch is arranged inside the electric push rod M1, when the plunger rod moves to a front dead point and a rear dead point, the motor can lose electricity, the plunger rod can not move any more, and the plunger. The stabilized voltage supply A is a finished product of an AC-to-DC switching power supply module with the model of 220V/12V/500W. The photoelectric switch A1 of the control circuit is a reflection type photoelectric switch finished product with model MT-J18-D50NK, and is provided with two power

supply input ends

1 and 2 pins and a high level output end 3 pin, when the reflection type photoelectric switch is in work, infrared beams emitted by a transmitting head of a detecting head at the front end of the reflection type photoelectric switch are blocked by objects, the high level output end does not output high level after a receiving head at the front end of the detecting head receives the infrared beams, the farthest detection distance is 50cm, an adjusting knob is arranged at the rear end of a shell, when the adjusting knob is adjusted leftwards, the detection distance is close, and when the adjusting knob is adjusted rightwards, the detection distance is far (the detection distance is 3cm after. The trigger subcircuit of the control circuit comprises relays K and K1, time control switches A2 and A3 and power switches S1 and S2 which are connected by circuit board wiring, the time control switches A2 and A3 are microcomputer time control switch finished products of model KG316T, the microcomputer time control switch finished products are provided with a liquid crystal display screen, seven cancel/restore, time correction, week correction, automatic/manual, timing and clock keys, two

power input ends

1 and 2 pins, two power output ends 3 and 4 pins, digits displayed by the liquid crystal display screen after being electrified, a user respectively operates the seven keys to set the time of power output ends 3 and 4 pins, the microcomputer time control switch has a memory function, the power failure of an external power supply can not cause the change of an internally set time program as long as the secondary setting adjustment is not carried out, and the power switch S1, The operation key of S2 is positioned outside the opening in the middle of the front end of the element box; the positive and negative pole power input ends of the first relay K are respectively connected with the power output end pin 3 and the negative pole power input end pin 2 of the photoelectric switch A1 through leads, one end of the first power switch S1 is connected with the positive pole power input end pin 1 of the first set of time control switch A2, the other end of the first power switch S1 is connected with one end of the second power switch S2, the positive control power supply input end of a second relay K1 is connected, the 3-pin positive power supply output end of a first set of time control switch A2 is connected with the positive power supply input end of a second relay K1, the 4-pin negative power supply output end of a first set of time control switch A2 (the 2-pin negative power supply input end is grounded) is connected with the negative and negative control power supply input ends of a second relay K1, two normally closed contact ends of a second relay K1 are respectively connected with the 1 and 2 pins at the two ends of the power supply input of a second set of time control switch A3, and the other end of the second power supply switch S2 is connected with the 1-pin positive power supply input end of a photoelectric switch A1.

As shown in fig. 3, the two input ends of the RT power supply of four PTC electric heating plates in the three heating shells of the three sets of movable heating mechanisms are connected in parallel by a lead (the outside of the lead is sleeved with a heat-proof insulating ceramic tube, and the front end of the lead is led out from the rear part of the rear end of the heating shell), and the input end of the RT power supply of the PTC electric heating plates of the three sets of movable heating mechanisms is connected with one end W of the temperature switch by a lead. The other end of the temperature switch W, the other end of the PTC electric heating plate RT power supply input and two poles of a 220V alternating current power supply are respectively connected through leads. The power input ends 1 and 2 of the stabilized voltage power supply A and the two poles of the alternating current 220V power supply are respectively connected through leads, and the two

ends

3 and 4 of the power output of the stabilized voltage power supply A and one end of a power switch S2 at the two power input ends of the trigger sub-circuit and the power input end of the negative pole of the relay K are respectively connected through leads. The other end of the power switch S2 at the two ends of the power output of the trigger sub-circuit, the 4 pins of the time control switch A2 and the two

ends

1 and 2 pins of the power input of the photoelectric switch A1 are respectively connected through leads. The output ends of the two control power supplies of the trigger sub-circuit are connected with the

pins

3 and 4 of time control switches A2 and A3 and the input ends of the electric telescopic rod M1 of the three sets of movable heating mechanisms through leads. One pole of the 220V alternating current power supply is connected with the control power supply input end of an alternating current control power supply input end relay K of the trigger sub-circuit through a lead, and the normally closed contact end of the alternating current control power supply output end relay K of the trigger sub-circuit, the other pole of the 220V alternating current power supply and the two ends of the power supply input of the two sets of motor speed reducing mechanisms M are respectively connected through leads.

As shown in fig. 1, 2 and 3, after the 220V power switch S is turned on, the 220V ac power enters

pins

1 and 2 of the regulated power supply a, so that the regulated power supply a is powered on and operates under the action of its internal circuit, and its

pins

3 and 4 output stable 12V power to enter both ends of the power input of the control circuit (in the initial state, the power switch S2 is in the on state, the power switch S1 is off, and the photoelectric switch a1 is in the powered on and operating state). After the power switch S is turned on, one pole of the 220V alternating current power supply can enter one end of a temperature switch W of the three sets of movable electric heating mechanisms, and when the temperature of a heating shell of the three sets of movable electric heating mechanisms is lower than a certain temperature (for example, 180 degrees), an internal contact of the temperature switch W is closed, so that the 220V alternating current power supply enters one power supply input end of a PTC electric heating plate RT of the three sets of movable electric heating mechanisms, and the PTC electric heating plate RT of the three sets of movable electric heating mechanisms is electrified to work and generate heat to heat a heating shell; when the heating shell temperature of three sets of movable electric heating mechanism is higher than certain (for example 180 degrees), the inside contact of temperature switch W opens a way, like this, 220V alternating current power supply no longer gets into three sets of movable electric heating mechanism's PTC electric heating board RT's power input one end, then, three sets of movable electric heating mechanism's PTC electric heating board RT stop heating, through above-mentioned circuit effect, this novel work back, three sets of movable electric heating mechanism's heating shell outside end will keep stable 180 degrees left and right sides temperature always.

As shown in fig. 1, 2 and 3, after the power switch S is turned on, one pole of the 220V ac power supply can enter one end of the power input ends of the two sets of motor speed reducing mechanisms M through the relay K control power input end and the relay K normally closed contact end, so that the two sets of motor speed reducing mechanisms M are powered on to work, the two belt rollers 211 drive the upper end of the conveying belt 23 to move rightwards (the rollers 22 play a role in guiding), and an operator can sequentially place a plurality of plastic bags to be sealed on the upper end of the conveying belt 23. When a plurality of bags of health care products to be packaged on the conveying belt 23 are packaged in one bag of packaging bag at the right side end and move to the front end of a detection head of the photoelectric switch A1, after infrared light beams emitted by a transmission head of the photoelectric switch A1 are blocked, 3 pins of the photoelectric switch A1 can output high levels to enter an anode power supply input end of the relay K, the relay K is electrified to attract a control power supply input end and a normally closed contact end of the relay K to be opened, and then two sets of motor reduction equipment M are not electrified and can not work. At this point the operator presses the button of power switch S1, whereupon the 12V power goes to pin 1 of time switch a2 and time switch a2 is in the powered on operating state. After the time control switch A2 is powered on to work, under the action of an internal circuit and power output time of 3 and 4 pins set by a technician, the 3 and 4 pins can output power with positive and negative poles for 8 seconds to enter the power input ends of the positive and negative poles of the electric telescopic rod M1 of the three sets of movable electric heating mechanisms, so that the electric telescopic rod M1 of the three sets of movable electric heating mechanisms is powered on to work, the plunger rod of the three sets of electric telescopic rods M1 can move forwards to push the three sets of electric heating shells 32 to move forwards, the upper end sealing parts of a plurality of plastic packaging bags are pressed and heated, the upper end seals of the plurality of plastic bags are simultaneously and thermally pressed together, the effect of simultaneously heating and sealing the upper ends of the plurality of plastic bags is achieved (about 3 seconds, the rear sides of the upper ends of the plurality of plastic bags can be contacted with the front ends of the three sets of electric heating shells 32, the front side of the plastic bags are contacted with the rear side of a front end baffle plate on a rack, the, the plunger rods of the three electric telescopic rods M1 are at the front dead center at the moment and stop working). The 3 and 4 foot output power of time switch A2 get into three sets of electric telescopic handle M1's power input both ends simultaneously, and the power still can get into relay K1 power input both ends, and then, relay K1 gets to be electrified its two control power input ends and two normally open contact ends open a way, so, time switch A3 can not get electric work. The power supply output by the

pins

3 and 4 of the time control switch A2 is stopped after 8 seconds of power supply output, and then the relay K1 and the three sets of electric telescopic rods M1 lose power. After the relay K1 loses power, two control power supply input ends and two normally open contacts of the relay K1 are respectively closed, and then the time control switch A3 is powered on to work. After the time control switch A3 is powered on to work, under the action of an internal circuit and the power output time of 3 and 4 pins set by a technician, 3 and 4 pins can output 3 seconds of positive and negative pole power supplies to enter the negative and positive pole power supply input ends of the electric telescopic rod M1 of the three sets of movable electric heating mechanisms, so that the electric telescopic rod M1 of the three sets of movable electric heating mechanisms is powered on to work, the plunger rods of the three sets of electric telescopic rods M1 can move backwards and drive the three sets of electric heating shells 32 to move backwards, the distance between the plunger rods and the rear side ends of the upper end sealing parts of a plurality of plastic packaging bags is opened, the three sets of electric heating shells 32 are positioned at the rear side outer side ends of the opening grooves of the rear side baffle 6, and.

As shown in fig. 1, 2 and 3, when an operator sees that a plurality of plastic bags are sealed, the power switches S1 and S2 are turned off, and then the time control switch a2 and the photoelectric switch a1 lose power, so that the relay K loses power and no longer attracts the control power input end of the relay and the normally closed contact end of the relay is closed, and then two sets of motor reduction equipment M are powered on again to work, two belt rollers 211 drive the upper end of the conveying belt 23 to move rightwards, and the conveying belt outputs a plurality of plastic bags to the food boxes at the lower part of the right end of the rack after being sealed. After the plastic bags completely enter the food box after being completely sealed, the novel sealing work of a batch of health care product packaging bags is completed. Then the power switch S2 can be turned on, the operator can place the plastic bags to be sealed on the upper end of the conveyor belt 23 in turn, the conveyor belt 23 conveys the food bags to the right side, and the process is completely consistent with the above process, so that the sealing operation of the next batch of packaging bags for health products can be carried out. This novel compact structure, convenient to use. This is novel once can be in the plastic food package bag of putting perpendicularly to a plurality of bags and seal, has improved work efficiency, because, the interval is only than about the plastic bag front and back end is wide 5mm between two baffle inboards around, the plastic bag can not collapse, has prevented that liquid health products etc. from spilling in the bag. The relay K, K1 is a DC12V relay.

The essential features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing device for plastic packaging bags of health care products comprises a frame and an electric conveying device, and is characterized by also comprising a movable heating mechanism, a voltage-stabilized power supply and a control circuit; the electric conveying equipment is arranged on the rack, and the front side and the rear side of the upper end of the rack are respectively provided with a baffle; the movable heating mechanisms are provided with a plurality of same sets, each set comprises an electric telescopic rod, a heating shell, a heating plate and a temperature switch, the heating plate is arranged in the heating shell, the temperature switch is arranged at the outer side end of the heating shell, the front end of a plunger rod of the electric telescopic rod is connected with the rear outer side end of the heating shell, and the electric telescopic rod barrels of the plurality of sets of movable heating mechanisms are arranged at the rear upper end of the rack; the rear side baffle at the upper end of the rack is transversely provided with an open slot, and the heating shells of the plurality of sets of movable heating mechanisms are transversely and linearly distributed at the rear side end of the open slot; the control circuit comprises a photoelectric switch and a trigger sub-circuit, and the photoelectric switch is arranged on one side of one baffle plate in the rack; the power input ends of the electric heating plates of the plurality of sets of movable heating mechanisms are electrically connected with one end of a temperature switch, and the other end of the temperature switch, the other end of the power input end of the electric heating plates and two poles of an alternating current power supply are respectively electrically connected; the stabilized voltage supply and the trigger sub-circuit are arranged in the element box; the two ends of the power output of the voltage-stabilized power supply are respectively and electrically connected with the two ends of the power input of the trigger sub-circuit, and the two ends of the power output of the trigger sub-circuit are respectively and electrically connected with the two ends of the power input of the photoelectric switch; the output ends of two paths of control power supplies of the trigger sub-circuit are respectively and electrically connected with the positive and negative poles and the negative and positive poles of the power supply input ends of the electric telescopic rods of the plurality of sets of movable heating mechanisms; one pole of the alternating current power supply is electrically connected with the input end of the alternating current control power supply of the trigger sub-circuit, and the output end of the alternating current control power supply of the trigger sub-circuit, the other pole of the alternating current power supply and the two ends of the power supply input of the electric conveying equipment are respectively and electrically connected.

2. The sealing apparatus for plastic packing bags for health supplies according to claim 1, wherein the interval between the two baffles at the upper end of the frame is larger than the front-rear thickness of the plastic packing bag.

3. A sealing apparatus for plastic packing bags for health supplies according to claim 1, wherein the electric heating plate of each set of the movable heating means is a PTC electric heating plate.

4. The sealing device for the plastic packaging bags for health care products as claimed in claim 1, wherein the internal contact of the temperature switch of each set of the movable heating mechanism is normally open.

5. The sealing apparatus for plastic bags for health supplies of claim 1, wherein the regulated power supply is an ac to dc switching power supply module.

6. The sealing apparatus for plastic bags for health supplies according to claim 1, wherein the photoelectric switch of the control circuit is a reflective photoelectric switch.

7. The sealing apparatus for plastic bags for health supplies according to claim 1, wherein the trigger circuit of the control circuit comprises relays, time-controlled switches, and power switches, which are wired via a circuit board, the positive and negative power input terminals of the first relay and the power output terminal and the negative power input terminal of the photoelectric switch are connected via wires, respectively, one end of the first power switch is connected to the positive power input terminal of the first set of time-controlled switches, the other end of the first power switch is connected to one end of the second power switch and the positive control power input terminal of the second relay, the positive power output terminal of the first set of time-controlled switches is connected to the positive power input terminal of the second relay, the negative power output terminal and the negative power input terminal of the first set of time-controlled switches are connected to the negative and negative control power input terminals of the second relay, two normally closed contact ends of the second relay are respectively connected with two power input ends of the second set of time control switch, and the other end of the second power switch is connected with the positive power input end of the photoelectric switch.