CN213194403U

CN213194403U - Glue melting device and glue gun

Info

Publication number: CN213194403U
Application number: CN202021102353.XU
Authority: CN
Inventors: 王伟毅; 陈德远
Original assignee: Hangzhou Greatstar Intelligent Technology Co ltd
Current assignee: Hangzhou Greatstar Intelligent Technology Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-05-14
Anticipated expiration: 2030-06-15

Abstract

The utility model discloses a melten gel device and gluey rifle belongs to the rubber coating instrument, and current hot melt adhesive rifle troublesome poeration, the sol effect is poor, the utility model discloses the configuration is used for detecting the temperature sensor of hot melt pipe temperature and for the heating plate of hot melt pipe heat supply on the hot melt pipe, constitutes neotype melten gel device from this, detects the temperature and offers the controller through temperature sensor, is presetting the control by the controller with the temperature control of hot melt pipe scope promptly, immediately pulls the trigger and can go out glue through going out the jiao kou immediately, needn't wait for convenient to use. The heating range is large, and the sol effect is good; no glue dripping and no glue overflow; can be automatically shut down.

Description

Glue melting device and glue gun

Technical Field

The utility model belongs to the rubber coating instrument, concretely relates to melten gel device and gluey rifle.

Background

The hot melt glue gun pushes the glue stick into the gun body, then heats the glue stick through the glue melting device in the gun body, and the glue stick flows out from the glue outlet after being liquefied. Continuously pushing the glue stick to continuously heat and liquefy the glue stick and continuously discharging glue.

Chinese utility model with the grant publication No. CN206882039U discloses a hot melt adhesive gun, which is characterized in that a main machine main switch and a trigger switch electrically connected with a circuit control panel are respectively arranged, and a trigger is in linkage fit with a trigger button of the trigger switch, when in use, a glue stick is inserted into a glue stick guide channel from the tail part of a gun body, the glue stick is clamped by a glue stick clamping seat, under the working state, the main machine main switch is started, the glue gun is in the power-on state, the circuit control panel enables a heating hot melting device to start working and preheat, at the moment, a user drives the glue stick clamping seat to slide through the trigger to drive the glue stick to synchronously move along the glue stick guide channel, the glue stick moves towards a melt cavity direction of the heating hot melting device to carry out glue stick feeding operation, at the moment of pulling the trigger, the trigger touches the trigger button at the first time, the trigger switch is started, at the moment, the circuit control panel controls the heating hot melting device, the melting cavity is rapidly heated, so that the glue stick entering the melting cavity is rapidly melted, the trigger is repeatedly pressed subsequently, the glue stick continuously advances under the pushing action of the glue stick clamping seat, and the melted liquid glue is continuously extruded from the glue outlet; during standby, the trigger restores to the original position under the action of the reset spring, so that the pressing action of the trigger on the trigger button disappears, the trigger switch is turned off, the temperature of the heating hot melting device is reduced, the flowability of molten glue in the melting cavity is reduced, and the energy-saving and anti-overflow effects are effectively achieved.

The hot melt glue gun has the following defects:

firstly, the heating and hot melting device can work in a preheating state or a high-temperature mode during working, a trigger needs to be pulled when the preheating state is converted into the high-temperature mode, but the heating and hot melting device cannot be heated up immediately after the trigger is pulled so as to melt the rubber rod, and the heating and hot melting device can be heated up to melt the rubber rod only after the trigger is pulled so as to keep the heating and hot melting device in a pulled state so as to keep the trigger switch in a starting state for a certain time, so that the operation is inconvenient.

Secondly, the heating plate is arranged on the straight wall of the conical heating part, the heating part is limited at the glue outlet, the heating range is small, and the sol effect is poor.

Thirdly, glue is dripped from a glue outlet.

Fourthly, the rear part of the heating hot melting device is easy to overflow glue.

Fifthly, the automatic shutdown cannot be realized, and if the shutdown is forgotten in use, energy consumption waste and potential safety hazard are caused.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model and the technical task that provides overcome current hot melt adhesive gun troublesome poeration, defect such as the sol effect is poor provides a melting device and glues the rifle to realize avoiding dripping glue, overflow to glue and automatic shutdown on this basis.

In order to achieve the above object, the utility model discloses a melten gel device, including a hot melt pipe that forms the melten gel chamber by the inside that heat conduction material made, the front end of hot melt pipe forms the intercommunication the play jiao kou in melten gel chamber, the last configuration of hot melt pipe is used for detecting the temperature sensor of hot melt pipe temperature reaches the heating plate for hot melt pipe heat supply.

The preferable technical means as the glue melting device is as follows: the hot melt pipe is provided with a first accommodating groove and a second accommodating groove, and the heating sheet and the temperature sensor are separately located in the first accommodating groove and the second accommodating groove.

The preferable technical means as the glue melting device is as follows: be equipped with the third holding tank on the hot melt pipe, the heating plate is located in the third holding tank and fixed by a clamp, temperature sensor quilt the clamp is fixed at the hot melt pipe outer wall.

The preferable technical means as the glue melting device is as follows: the hot melt pipe is provided with a valve port positioned between the melt glue cavity and the glue outlet, the valve port is plugged by a valve plug according to preset elasticity, and the valve plug can be pushed away from the valve port by the pressure in the melt glue cavity so that the melt glue cavity is communicated with the glue outlet.

The preferable technical means as the glue melting device is as follows: the heating plate is an MCH heating plate.

In order to achieve the above object, the utility model discloses a glue gun, which comprises a housin, the rear end of casing is equipped with glues the stick import, dispose advancing mechanism in the casing, advancing mechanism has and exposes the outer trigger of casing, characterized by: this glue gun still includes the utility model discloses a melten gel device, the hot melt pipe corresponds glue excellent import, advancing mechanism is located glue excellent import with between the hot melt pipe.

As the preferable technical means of the glue gun: the rear end of the hot melting pipe is connected with a sealing sleeve, and the rubber rod is in sealing contact with the sealing sleeve to realize sealing when penetrating into the sealing sleeve.

As the preferable technical means of the glue gun: the sealing sleeve is elastic, and a protective pipe is sleeved outside the sealing sleeve.

As the preferable technical means of the glue gun: the pushing mechanism comprises a hoop used for being sleeved on a rubber rod and a claw connected to the hoop, the claw is connected with the trigger through a connecting rod, when the trigger is pulled, the trigger drives the claw to move relative to the hoop through the connecting rod so that the claw and the hoop cooperate to clamp the rubber rod and push the rubber rod forwards, and when the trigger resets, the claw and the hoop release the rubber rod and reset along with the rubber rod.

As the preferable technical means of the glue gun: the trigger is connected with a return spring for promoting the trigger to be reset after being pulled.

As the preferable technical means of the glue gun: the jack catch swing assembly is in on the ferrule, when pulling the trigger the jack catch swings thereupon and its front portion draws close to the ferrule in order with the ferrule cooperation blocks the excellent and with the excellent forward propelling movement of rubber, when the trigger resets, the jack catch swings thereupon in the reverse direction and its front portion is kept away from the ferrule is in order to release the excellent and reset thereupon.

As the preferable technical means of the glue gun: the front part of the clamping jaw is provided with a clamping tooth for clamping the rubber stick.

As the preferable technical means of the glue gun: the ferrule is fitted in the housing so as to move forward and backward via the guide portion.

As the preferable technical means of the glue gun: the heating plate and the temperature sensor are connected to a controller with a preset temperature control range, the temperature detected by the temperature sensor is lower than the lower limit of the preset temperature control range, the controller instructs the heating plate to heat, the temperature detected by the temperature sensor is higher than the upper limit of the preset temperature control range, and the controller instructs the heating plate to stop heating.

As the preferable technical means of the glue gun: the controller is connected with a linked switch and is provided with a master control switch, the linked switch is in linked fit with the trigger to detect whether the trigger is pulled, and the controller enables the master control switch to be switched off when the time that the trigger is not pulled exceeds the preset time of the controller.

As the preferable technical means of the glue gun: the heating plate, the temperature sensor, the controller, the linked switch and the master control switch are powered by a storage battery assembled in the shell.

The utility model discloses the configuration is used for detecting the temperature sensor of hot melt pipe temperature and for the heating plate of hot melt pipe heat supply on the hot melt pipe, constitutes neotype melten gel device from this, detects the temperature and offers the controller through temperature sensor, is presetting the control by temperature control scope with the hot melt pipe by the controller promptly, immediately pulls the trigger and can go out glue through going out the jiao kou immediately, needn't wait for convenient to use.

The utility model discloses a heating plate is to whole hot melt pipe heat supply, and heating range is big, and the sol is effectual.

The utility model discloses being equipped with the valve port in a jiao kou inboard, the valve port is avoided gluing mouthful glue dripping from a valve by the valve plug according to predetermined elasticity shutoff, when needing to extrude glue from a jiao kou, detains the trigger and makes gluey stick promote forward, makes the pressure increase of melten gel intracavity, and the valve plug can be pushed away from the valve port and make melten gel chamber and play jiao kou intercommunication, and glue is extruded from a jiao kou.

The utility model discloses connect a sealing sleeve at the hot melt pipe rear end, glue when the stick penetrates sealing sleeve and glue stick and sealing sleeve sealing contact realization and seal, avoid the excessive glue of hot melt pipe rear end.

The utility model discloses establish link switch and, total control switch, link switch and trigger linkage cooperation are used for detecting the trigger and whether is pulled, and the time that the trigger was not pulled surpasss the controller when presetting the time controller makes total control switch open circuit to shut down the rifle of gluing. Therefore, automatic shutdown is realized, and excessive energy consumption and potential safety hazards are avoided.

Drawings

FIG. 1 is an isometric view of the glue gun of the present invention;

FIG. 2 is a front plan view of the glue gun of FIG. 1;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of the internal structure of the glue gun from the perspective of FIG. 2;

FIG. 5 is a schematic structural view of the glue melting apparatus shown in FIGS. 3-4;

FIG. 6 is a schematic view of the external structure of the glue melting apparatus shown in FIG. 5;

FIG. 7 is another schematic structural view of the glue melting device of the present invention;

FIG. 8 is a schematic view of the glue melting apparatus of FIG. 7 from another perspective;

fig. 9 is a schematic diagram of the circuit control of the present invention;

the reference numbers in the figures illustrate:

100, a shell body: 101 a first shell, 102 a second shell, 103 a glue stick inlet, 104 a grab handle, 105 a transverse part and 106 a bracket;

200, a propelling mechanism: 201 trigger, 202 connecting rod, 203 jaw, 204 hoop, 205 return spring, 206 latch, 207 guide part;

300, a glue melting device: 301 hot melt pipe, 302 heating sheet, 303 temperature sensor, 304 molten glue cavity, 305 glue outlet, 306 first containing groove, 307 second containing groove, 308 valve port, 309 valve plug, 310 spring, 311 valve body, 312 third containing groove, 313 clamp;

400 sealing sleeve, 401 annular sealing rib, 402 protecting tube, 403 spring hoop;

the intelligent charging system comprises a controller 500, a 501 linkage switch, a 502 master control switch, a 503 storage battery, a 504USB interface, 505 heating indicator lamps and 506 charging indicator lamps;

600 glue stick.

Detailed Description

The present invention will be further explained with reference to the drawings attached to the specification.

The glue gun as shown in fig. 1-4 comprises a housing 100, which is formed by symmetrically butting a first housing 101 and a second housing 102 and fastening them by fasteners for assembly. The rear end of the housing is provided with a glue stick inlet 103 for inserting a glue stick 600 into the housing for use.

The shell is internally provided with a propelling mechanism 200 and a glue melting device 300, the glue melting device is positioned at the front end of the shell, the propelling mechanism is positioned between the glue stick inlet and the glue melting device, the propelling mechanism is used for pushing the glue stick to the glue melting device, and the glue melting device is used for heating and liquefying the pushed glue stick into glue solution which can be output outwards for gluing.

The advancing mechanism 200 comprises a trigger 201, a link 202, a pawl 203, a band 204, and a return spring 205. The trigger 201 is mounted by a shaft at the corner of the grip 104 and cross-piece 105 of the housing 100 and partially exposed outside the housing for actuation. The return spring 205 is a helical extension spring, and both ends of the helical extension spring are connected to the trigger 201 and the housing 100, respectively, to keep the trigger in an unfixed state as shown in the figure, and the elastic force of the return spring can urge the trigger to return after the trigger is fired. The hoop 204 is arranged in the shell through the guide part 207 in a back-and-forth movement mode so as to be sleeved on the glue stick and matched with the clamping jaws to clamp the glue stick. The claw 203 is connected to the hoop 204 through a shaft and can swing back and forth relative to the hoop, a through-going channel is formed between the claw 203 and the hoop 204 for sheathing a rubber rod, and the front part of the claw 203 is provided with a latch 206. The two ends of the connecting rod 202 are respectively connected with the claw 203 and the trigger 201 through a shaft. Accordingly, when the trigger 201 is pulled by holding the handle 104, the trigger 201 drives the claw 203 to swing relative to the hoop 204 through the connecting rod 202, the latch 206 at the front part of the claw 203 draws close to the hoop 204 to reduce the passage, and the claw and the hoop cooperate to clamp and push the rubber stick forward; when the trigger is released, the trigger is reset by a return spring 205, the claw swings reversely, a latch 206 at the front part of the claw is far away from a hoop 204, the passage is enlarged, and the latch and the hoop release a rubber rod and reset along with the trigger.

As shown in fig. 5 to 6, the melting apparatus 300 includes a melting tube 301, a heating sheet 302, and a temperature sensor 303. The hot melting tube 301 is a tubular structure made of a heat conducting material and having a melt cavity 304 formed therein and extending forward and backward, the front end of the hot melting tube 301 forms a glue outlet 305 communicating with the melt cavity, the diameter of the glue outlet is reduced relative to the melt cavity to be suitable for gluing, and the glue outlet extends out of the casing. The first receiving groove 306 and the second receiving groove 307 are formed in the thermal melting tube 301, the heating sheet 302 is located in the first receiving groove 306, and the temperature sensor 303 is located in the second receiving groove 307, so that when the heating sheet is powered to heat the thermal melting tube 301, the temperature of the thermal melting tube is increased accordingly, the temperature of the thermal melting tube can be controlled within a preset temperature range by detecting the temperature of the thermal melting tube by the temperature sensor and controlling a controller mentioned below, and the control is represented in fig. 9. The heat patch is preferably an MCH heat patch.

In order to prevent glue from dripping from the glue outlet, the hot melt pipe 301 is provided with a valve port 308 between the glue melting chamber and the glue outlet, the valve port 308 is blocked by a valve plug 309 according to a preset elastic force, the elastic force depends on the elastic force of a spring 310 supported on the valve plug and the aperture of the valve port, when the pressure in the glue melting chamber increases, the valve plug can be pushed away by the pressure in the glue melting chamber from the valve port so that the glue melting chamber is communicated with the glue outlet, and liquid glue can be squeezed out from the glue outlet for gluing. In the figure, the valve port 308, the valve plug 309 and the spring 310 are integrally assembled on a channel between a glue melting cavity and a glue outlet as a valve, the valve integrally comprises a valve body 311, the valve port 308 is arranged on the valve body 311, and the valve plug 309 and the spring 310 are arranged in the valve body 311. In specific implementation, the valve port can be arranged at a port of a sleeve, the sleeve is assembled on a channel between the glue melting cavity and the glue outlet, and the valve plug and the spring are limited in the channel.

The heater blade 302 and the temperature sensor 303 of the melting apparatus may also be mounted on the melt tube in the manner shown in fig. 7-8. The hot melt pipe 301 is provided with a third accommodating groove 312, the heating plate 302 is positioned in the third accommodating groove 312 and fixed by a clamp 313, and the temperature sensor 303 is fixed on the outer wall of the hot melt pipe by the clamp 313.

In order to prevent the liquid glue solution from overflowing from the rear end of the hot melting tube, the rear end of the hot melting tube 301 is connected with a sealing sleeve 400, and the glue stick 600 penetrates into the sealing sleeve 400 to be in sealing contact with the sealing sleeve to realize sealing. Particularly, the sealing sleeve has elasticity, an annular sealing rib 401 is arranged in the sealing sleeve, the annular sealing rib has large deformation capacity to form reliable sealing with the rubber rod, a protective pipe 402 is sleeved outside the sealing sleeve, the protective pipe fixes the sealing sleeve by means of the shell, radial deformation of the sealing sleeve can be limited, and sealing effect with the rubber rod is promoted. For a reliable connection, the sealing sleeve 400 is fitted over the rear end of the thermofusion tube 301 and tightened with a spring band 403. Moreover, the sealing sleeve has the function of preventing the glue stick from retreating, namely, when the trigger is pulled to push the glue stick forwards, the friction between the glue stick and the sealing sleeve can be overcome, and when the trigger is reset, the friction between the glue stick and the sealing sleeve can prevent the glue stick from retreating.

In the glue gun, the glue rod inlet 103, the hoop 204, the sealing sleeve 400 and the hot melt pipe 301 correspond to each other, and the glue rod 600 can be inserted into the melt cavity 304 of the hot melt pipe 301 through the glue rod inlet 103, the hoop 204 and the sealing sleeve 400.

As shown in FIG. 9, in order to control the temperature of the thermofusion tube so that the trigger can be triggered to squeeze the glue out immediately after the intermittence, if the intermittence exists, the heating plate 302 and the temperature sensor 303 are connected to a controller 500 having a preset temperature control range, the controller instructs the heating plate to heat when the temperature detected by the temperature sensor is lower than the lower limit of the preset temperature control range, and instructs the heating plate to stop heating when the temperature detected by the temperature sensor is higher than the upper limit of the preset temperature control range. So that the thermal melting pipe can be always maintained in a preset temperature range. Preferably, the preset temperature range can liquefy the glue stick and store the glue stick in the glue melting cavity. And because the valve port in front of the glue melting cavity is plugged by the valve plug, the sealing sleeve behind the glue melting cavity is sealed with the glue stick, and the glue solution in the glue melting cavity can not drip from the glue outlet, and can not overflow from the rear end of the sealing sleeve. And pulling a trigger when the glue is required to be coated. The controller is a circuit board that is shown mounted in the upper rear portion of the housing.

In order to automatically shut down, the controller 500 is connected with a linkage switch 501 and is configured with a master control switch 502, and the controller can be turned on and shut down through the master control switch. The linkage switch 501 is arranged in the casing 100 at a position close to the trigger 201 and is in linkage fit with the trigger to detect whether the trigger is pulled, and when the time that the trigger is not pulled exceeds the preset time of the controller, the controller enables the master switch to disconnect the circuit to shut down the glue gun. Specifically, when the trigger is pulled, the linked switch is triggered to provide a signal for the controller to indicate that the trigger is pulled, and the master control switch is connected with the circuit; once the trigger is reset or not pulled, the linked switch is not triggered to provide another signal for the controller to indicate that the trigger is not pulled, and the linked switch is used as a time starting point to control whether the master control switch is turned off or not through the clock circuit. For example, the preset time of the controller is 20 minutes, if there is an interval in use, the controller will not automatically shut down when the interval is less than 20 minutes, and will automatically shut down when the interval is more than 20 minutes.

The glue gun, the heating plate, the temperature sensor, the controller, the linked switch and the master control switch are powered by a storage battery 503 assembled in the shell. Further, a USB interface 504 is mounted on the housing for charging, a heating indicator lamp 505 is disposed on the housing for indicating heating, and a charging indicator lamp 506 is disposed on the housing for indicating charging.

In order to facilitate the intermittent placement of the glue gun, the front end of the transverse part of the shell is provided with a turnover bracket 106, the bracket can lean against the transverse part as shown in the drawing when the glue gun is used, and the bracket can be turned downwards when the glue gun is placed and can be placed together with the grab handle.

The glue gun is provided with a 2600mAh storage battery, the charging time is 2.5H, the continuous service time is 30min, the standby heat preservation time is 100min, the working condition service time (one cycle of extruding a glue stick with the diameter of 7mm and the length of 50mm every three minutes) is 55min, the heating time is 2min, and the maximum glue yield of 1min is 5 g.

When the heating indicator lamp is used, the heating indicator lamp is started for two seconds by pressing the master control switch for a long time, and the indicator lamp to be heated is turned green from red, so that the heating indicator lamp can be used. And when the system is in a power-on state, the system is turned off by pressing the master control switch. And after power is lacked, the machine is automatically shut down.

Under the condition of the same total power supply electric quantity, under the condition of an interval working condition, the product and a conventional product set a repetition interval and a use time (the set interval is the same as the use time) on the premise of the same glue stick material, and effective use time and glue yield comparison data are measured, wherein the use data are compared as follows (the use time comprises the interval time; the record is started by extruding one glue stick):

the comparison data shows that under the working condition of interval use, the product has higher energy utilization rate under the condition of interval use after the interval of 5 minutes groups, and has longer service time and more glue yield compared with the conventional product.

Claims

1. The glue melting device is characterized in that: the hot melting pipe is made of heat-conducting materials, a molten glue cavity is formed inside the hot melting pipe, a glue outlet communicated with the molten glue cavity is formed in the front end of the hot melting pipe, and a temperature sensor used for detecting the temperature of the hot melting pipe and a heating sheet used for supplying heat to the hot melting pipe are arranged on the hot melting pipe;

the hot melt pipe is provided with a first accommodating groove and a second accommodating groove, and the heating sheet and the temperature sensor are separately located in the first accommodating groove and the second accommodating groove.

2. The glue melting device is characterized in that: the hot melting pipe is made of heat-conducting materials, a molten glue cavity is formed inside the hot melting pipe, a glue outlet communicated with the molten glue cavity is formed in the front end of the hot melting pipe, and a temperature sensor used for detecting the temperature of the hot melting pipe and a heating sheet used for supplying heat to the hot melting pipe are arranged on the hot melting pipe;

be equipped with the third holding tank on the hot melt pipe, the heating plate is located in the third holding tank and fixed by a clamp, temperature sensor quilt the clamp is fixed at the hot melt pipe outer wall.

3. The glue melting device is characterized in that: the hot melting pipe is made of heat-conducting materials, a molten glue cavity is formed inside the hot melting pipe, a glue outlet communicated with the molten glue cavity is formed in the front end of the hot melting pipe, and a temperature sensor used for detecting the temperature of the hot melting pipe and a heating sheet used for supplying heat to the hot melting pipe are arranged on the hot melting pipe;

the hot melt pipe is provided with a valve port positioned between the melt glue cavity and the glue outlet, the valve port is plugged by a valve plug according to preset elasticity, and the valve plug can be pushed away from the valve port by the pressure in the melt glue cavity so that the melt glue cavity is communicated with the glue outlet.

4. Glue the rifle, including the casing, the rear end of casing is equipped with glues the stick import, dispose advancing mechanism in the casing, advancing mechanism has and exposes in the trigger outside the casing, characterized by: the glue gun further comprises the glue melting device as claimed in any one of claims 1 to 3, wherein the hot melt pipe corresponds to the glue stick inlet, and the pushing mechanism is located between the glue stick inlet and the hot melt pipe.

5. The glue gun of claim 4, wherein: the rear end of the hot melting pipe is connected with a sealing sleeve, and the rubber rod is in sealing contact with the sealing sleeve to realize sealing when penetrating into the sealing sleeve.

6. The glue gun of claim 5, wherein: the sealing sleeve is elastic, and a protective pipe is sleeved outside the sealing sleeve.

7. The glue gun of claim 4, wherein: the pushing mechanism comprises a hoop used for being sleeved on a rubber rod and a claw connected to the hoop, the claw is connected with the trigger through a connecting rod, when the trigger is pulled, the trigger drives the claw to move relative to the hoop through the connecting rod so that the claw and the hoop cooperate to clamp the rubber rod and push the rubber rod forwards, and when the trigger resets, the claw and the hoop release the rubber rod and reset along with the rubber rod.

8. The glue gun of claim 7, wherein: the trigger is connected with a return spring for promoting the trigger to be reset after being pulled.

9. The glue gun of claim 7, wherein: the jack catch swing assembly is in on the ferrule, when pulling the trigger the jack catch swings thereupon and its front portion draws close to the ferrule in order with the ferrule cooperation blocks the excellent and with the excellent forward propelling movement of rubber, when the trigger resets, the jack catch swings thereupon in the reverse direction and its front portion is kept away from the ferrule is in order to release the excellent and reset thereupon.

10. The glue gun of claim 9, wherein: the front part of the clamping jaw is provided with a clamping tooth for clamping the rubber stick.

11. The glue gun of claim 7, wherein: the ferrule is fitted in the housing so as to move forward and backward via the guide portion.

12. The glue gun of claim 4, wherein: the heating plate and the temperature sensor are connected to a controller with a preset temperature control range, the temperature detected by the temperature sensor is lower than the lower limit of the preset temperature control range, the controller instructs the heating plate to heat, the temperature detected by the temperature sensor is higher than the upper limit of the preset temperature control range, and the controller instructs the heating plate to stop heating.

13. The glue gun of claim 12, wherein: the controller is connected with a linked switch and is provided with a master control switch, the linked switch is in linked fit with the trigger to detect whether the trigger is pulled, and the controller enables the master control switch to be switched off when the time that the trigger is not pulled exceeds the preset time of the controller.

14. The glue gun as recited in claim 13, further comprising: the heating plate, the temperature sensor, the controller, the linked switch and the master control switch are powered by a storage battery assembled in the shell.

15. The glue gun of claim 4, wherein: the heating plate is an MCH heating plate.