CN218726827U - Composite insulation board heat conductivity detector - Google Patents

Abstract

The utility model relates to the technical field of insulation board production, in particular to a composite insulation board heat conductivity detector which can automatically send out a sample, avoid scalding workers by a hot plate, reduce danger and has high practicability; the device comprises a detection cabinet, a control box is arranged on the detection cabinet, and two box doors are hinged on the detection cabinet; still include the hot plate, hold in the palm the groove, discharge mechanism, two layer boards, fixture, clamp plate and a plurality of temperature sensor, the middle part at detecting the cabinet is installed to the hot plate, the middle part of hot plate is provided with the measurement heating unit, the bottom of lateral wall all is provided with the support groove about the hot plate, discharge mechanism installs the back lower part at the hot plate, discharge mechanism sees the sample off the external world that detects the cabinet through two layer boards, the left and right sides at the hot plate is installed respectively to two fixture, two fixture all include the clamp plate, two clamp plates compress tightly two samples on two hot plates, all be provided with a plurality of temperature sensor on the lateral wall about two clamp plates and hot plate.

Description

Composite insulation board heat conductivity detector

Technical Field

The utility model relates to a technical field of heated board production especially relates to a composite insulation board heat conductivility detector.

Background

The heat conductivity of the composite insulation board is an important performance index, after the composite board is produced, the composite board needs to be sampled randomly according to a certain proportion and the sample needs to be subjected to heat conductivity detection, the heat conductivity detector can be used when the heat conductivity of the composite insulation board is detected, the heat conductivity detector can detect the heat conductivity of the sample, the heat conductivity is in direct proportion to the heat conductivity, and the larger the heat conductivity is, the better the heat conductivity is.

The heat conductivity detector of the existing composite insulation board generally adopts a 'protective hot plate method', when detecting, the two sides of the composite insulation board are respectively contacted with stable heat sources and cold sources with different temperatures, so that the two sides of the composite insulation board form stable heat conduction, the temperature difference of the two sides of the composite insulation board is measured through a temperature sensor after a certain time, and therefore, the heat conductivity coefficient is obtained through calculation through the heat flow density, the temperature difference of the two sides and the thickness of a sample, and the heat conductivity of the composite insulation board is detected.

Current composite insulation board thermal conductivity detector does not possess automatic discharging's function, and after the detection achievement, the temperature of hot plate is higher to with the contact of composite insulation board sample, high temperature hot plate caused the scald accident easily when artifical manual heated board sample of taking out, has certain danger, waits for heated board sample natural cooling to consume the time longer, and the practicality that leads to equipment is lower.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a can see off the sample automatically, avoid the hot plate to scald the workman, reduce danger, the high composite insulation board thermal conductivity detector of practicality.

The utility model discloses a composite insulation board heat conductivity detector, including detection cabinet, control box and chamber door, the lower part of detecting the cabinet is installed air pump and electrical equipment, and the upper portion of detecting the cabinet is provided with the detection space, and the control box is installed on detecting the cabinet, and the control box is provided with display and operating button, and two chamber doors articulate on detecting the cabinet, and two chamber doors seal the detection space of detecting the cabinet; the automatic detection device comprises a detection cabinet, and is characterized by further comprising a hot plate, support grooves, a discharging mechanism, two support plates, clamping mechanisms, a pressing plate and a plurality of temperature sensors, wherein the hot plate is arranged in the middle of a detection space of the detection cabinet, a metering heating unit is arranged in the middle of the hot plate, the support grooves are arranged at the bottoms of the left side wall and the right side wall of the hot plate, the discharging mechanism is arranged at the lower rear part of the hot plate and comprises two support plates which are respectively slidably arranged in the two support grooves, the discharging mechanism sends a sample out of the outside of the detection cabinet through the two support plates, the two clamping mechanisms are respectively arranged at the left side and the right side of the hot plate and respectively comprise the pressing plate, the two samples are tightly pressed on the two hot plates by the two pressing plates, the two pressing plates and the left side wall and the right side wall of the hot plate are respectively provided with the plurality of temperature sensors, and the plurality of temperature sensors detect the temperatures at the two sides of the samples; the method comprises the steps of vertically placing two samples of the composite insulation board on two supporting plates respectively, pushing the samples into the interior of a detection cabinet, operating two clamping mechanisms to push two pressing plates to press the two samples tightly on the left side wall and the right side wall of a hot plate, enabling probes of a plurality of temperature sensors to be in contact with the left side surface and the right side surface of the two samples respectively, detecting initial temperatures of two sides of the two samples by the plurality of temperature sensors, closing the two box doors, starting a metering heating unit in the hot plate, enabling the hot plate to reach stable temperatures, enabling the inner sides and the outer sides of the two samples to be in environments with different temperatures, enabling the plurality of temperature sensors to detect temperature changes of two sample sides, obtaining temperature differences of two sample sides through the plurality of temperature sensors after a period of time, obtaining heat flux density passing through the samples through the metering heating unit of the hot plate, measuring the thickness of the samples, calculating the heat conductivity coefficient of the composite insulation board, displaying results on a display of a control box, opening the two box doors after detection is finished, resetting the two clamping mechanisms, driving the two pressing plates to be separated from the two samples, driving the two supporting plates to push the two supporting plates to the outside of the detection cabinet, and avoiding the danger of workers after the sample cooling equipment is taken out, and reducing the danger of workers.

Preferably, the discharging mechanism comprises two supporting plates, two sliders, two first pushing arms, two second pushing arms and a double-head motor, chutes are formed in the upper end surfaces of two supporting grooves, sliders are arranged on the lower end surfaces of the two supporting plates, the two sliders are in sliding connection with the chutes of the two supporting grooves, the lower ends of the first pushing arms are respectively in rotating connection with the inner ends of the two supporting plates, the upper ends of the first pushing arms are respectively in rotating connection with the upper ends of the second pushing arms, the double-head motor is mounted at the rear part of the hot plate, a rotor driving shaft of the double-head motor extends out of the front end and the rear end of the double-head motor, and the lower ends of the second pushing arms are respectively connected with the front end and the rear end of a driving shaft of the double-head motor; after the detection is completed, the double-end motor runs, the double-end motor drives the two pushing arms II and the two pushing arms I to extend and flatten, the two supporting plates and the two sliding blocks are outwards pushed out along the two sliding grooves of the supporting groove, the two supporting plates send the two samples out of the outside of the detection cabinet, the two sample wafers are kept away from the high-temperature hot plate, the workers are prevented from being scalded when the sample wafers are taken out, and the safety is improved.

Preferably, the clamping mechanism comprises a pressing plate, two mounting frames, a plurality of sliding rods and a cylinder, the two mounting frames are mounted on the inner wall of the detection space of the detection cabinet, the sliding rods are respectively mounted on the two mounting frames in a sliding manner, the pressing plate is mounted at the inner ends of the sliding rods, the fixed end of the cylinder is mounted on the two mounting frames through a support, the moving end of the cylinder is connected with the pressing plate, and the pressing plate is located between the hot plate and the two mounting frames; after two samples were loaded on two support grooves, the removal end extension of two cylinders promoted two clamp plate hot plates for two clamp plates compress tightly two samples on the lateral wall about the hot plate, and a plurality of slide bars carry out spacing direction to two clamp plates, realize the self-holding of sample with relax improve equipment's practicality.

Preferably, the cooling device further comprises two cooling pipes, and the cooling pipes are arranged inside the two pressing plates; the import and the export of two cooling tubes are connected with refrigerating system through the hose respectively, and refrigerating system's refrigerant cools off two clamp plates through two cooling tubes, and two clamp plates cool off the lateral surface of two samples, can make the both sides of sample form great initial difference in temperature, improve the scope that detects.

Preferably, the air conditioner is arranged on the detection cabinet, and an air outlet of the air conditioner extends into a detection space of the detection cabinet; the air conditioner adjusts the temperature of the detection space of the detection cabinet, cools the hot plate, shortens the time of detection intervals and enables the detection environment in the detection cabinet to be less affected by the outside.

Preferably, the bracket also comprises two limiting blocks, a plurality of guide rods and a plurality of springs, wherein the two limiting blocks are respectively positioned at the front ends of the two bracket grooves, the two limiting blocks are respectively installed on the left side and the right side of the hot plate in a sliding manner through the plurality of guide rods, the plurality of springs are respectively sleeved on the plurality of guide rods, one ends of the plurality of springs are connected with the two limiting blocks, and the other ends of the plurality of springs are connected with the left side and the right side of the hot plate; after two samples are loaded on the two supporting plates, the two samples are pushed to the side walls of the two supporting grooves by the two limiting blocks under the action of the elastic force of the 20 samples, a certain gap is formed between the two samples and the hot plate, the temperature of the two samples is adjusted to be the same as the internal environment of the 01 bracket by the air blown out by the air conditioner conveniently, then the two samples are pressed to the hot plate by the two samples 07, and the two limiting blocks, the guide rods and the 2 springs are compressed to improve the detection precision.

Compared with the prior art, the beneficial effects of the utility model are that: the method comprises the steps of vertically placing two samples of the composite insulation board on two supporting plates respectively, pushing the samples into the interior of a detection cabinet, operating two clamping mechanisms to push two pressing plates to press the two samples tightly on the left side wall and the right side wall of a hot plate, enabling probes of a plurality of temperature sensors to be in contact with the left side surface and the right side surface of the two samples respectively, detecting initial temperatures of two sides of the two samples by the plurality of temperature sensors, closing the two box doors, starting a metering heating unit in the hot plate, enabling the hot plate to reach stable temperatures, enabling the inner sides and the outer sides of the two samples to be in environments with different temperatures, enabling the plurality of temperature sensors to detect temperature changes of two sample sides, obtaining temperature differences of two sample sides through the plurality of temperature sensors after a period of time, obtaining heat flux density passing through the samples through the metering heating unit of the hot plate, measuring the thickness of the samples, calculating the heat conductivity coefficient of the composite insulation board, displaying results on a display of a control box, opening the two box doors after detection is finished, resetting the two clamping mechanisms, driving the two pressing plates to be separated from the two samples, driving the two supporting plates to push the two supporting plates to the outside of the detection cabinet, and avoiding the danger of workers after the sample cooling equipment is taken out, and reducing the danger of workers.

Drawings

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

FIG. 2 is a schematic view of the axial measurement structure of the present invention;

FIG. 3 is an enlarged schematic view of the hot plate, bracket and clamping mechanism;

FIG. 4 is an enlarged schematic view of the structure of the discharging mechanism and the like;

FIG. 5 is an enlarged schematic view of the structure of the chucking mechanism and the like;

in the drawings, the reference numbers: 1. a detection cabinet; 2. a control box; 3. a box door; 4. a hot plate; 5. a bracket; 6. a support plate; 7. pressing a plate; 8. a temperature sensor; 9. a slider; 10. a first push arm; 11. a second pushing arm; 12. a double-headed motor; 13. a mounting frame; 14. a slide bar; 15. a cylinder; 16. a cooling tube; 17. an air conditioner; 18. a limiting block; 19. a guide bar; 20. a spring.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

As shown in fig. 1 to 5, the detector for detecting the heat conductivity of the composite heat-insulating board comprises a detection cabinet 1, a control box 2 and box doors 3, wherein an air pump and electrical equipment are installed at the lower part of the detection cabinet 1, a detection space is arranged at the upper part of the detection cabinet 1, the control box 2 is installed on the detection cabinet 1, the control box 2 is provided with a display and an operation button, the two box doors 3 are hinged on the detection cabinet 1, and the detection space of the detection cabinet 1 is sealed by the two box doors 3; the automatic detection device comprises a detection cabinet 1, and is characterized by further comprising a hot plate 4, a bracket 5, a discharging mechanism, two supporting plates 6, clamping mechanisms, a pressing plate 7 and a plurality of temperature sensors 8, wherein the hot plate 4 is arranged in the middle of a detection space of the detection cabinet 1, a metering heating unit is arranged in the middle of the hot plate 4, the bracket 5 is arranged at the bottom of each of the left and right side walls of the hot plate 4, the discharging mechanism is arranged at the lower rear part of the hot plate 4 and comprises the two supporting plates 6, the two supporting plates 6 are respectively arranged in the two bracket 5 in a sliding manner, the discharging mechanism sends a sample out of the outside of the detection cabinet 1 through the two supporting plates 6, the two clamping mechanisms are respectively arranged at the left and right sides of the hot plate 4, each of the two clamping mechanisms comprises the pressing plate 7, the two samples are tightly pressed on the two hot plates 4 by the two pressing plates 7, the left and right side walls of the hot plate 4 are respectively provided with the plurality of temperature sensors 8, and the plurality of temperature sensors 8 detect the temperatures at two sides of the sample; the discharging mechanism comprises two supporting plates 6, two sliders 9, two pushing arms I10, two pushing arms II 11 and a double-head motor 12, sliding grooves are formed in the upper end faces of two supporting plates 5, the sliders 9 are arranged on the lower end faces of the two supporting plates 6, the two sliders 9 are in sliding connection with the sliding grooves of the two supporting plates 5, the lower ends of the two pushing arms I10 are respectively in rotating connection with the inner ends of the two supporting plates 6, the upper ends of the two pushing arms I10 are respectively in rotating connection with the upper ends of the two pushing arms II 11, the double-head motor 12 is installed on the rear portion of the hot plate 4, a rotor driving shaft of the double-head motor 12 extends out of the front end and the rear end of the double-head motor 12, and the lower ends of the two pushing arms II 11 are respectively connected with the front end and the rear end of a driving shaft of the double-head motor 12; the clamping mechanism comprises a pressing plate 7, two mounting frames 13, a plurality of sliding rods 14 and a cylinder 15, the two mounting frames 13 are mounted on the inner wall of a detection space of the detection cabinet 1, the sliding rods 14 are respectively mounted on the two mounting frames 13 in a sliding manner, the pressing plate 7 is mounted at the inner ends of the sliding rods 14, the fixed end of the cylinder 15 is mounted on the two mounting frames 13 through a support, the moving end of the cylinder 15 is connected with the pressing plate 7, and the pressing plate 7 is located between the hot plate 4 and the two mounting frames 13;

two samples of the composite insulation board are respectively vertically placed on two supporting plates 6 and are pushed towards the inside of the detection cabinet 1, the moving ends of two cylinders 15 extend to push the hot plates 4 of the two pressing plates 7, so that the two pressing plates 7 tightly press the two samples on the left side wall and the right side wall of the hot plate 4, probes of a plurality of temperature sensors 8 are respectively contacted with the left side surface and the right side surface of the two samples, the plurality of temperature sensors 8 detect the initial temperatures of the two sides of the two samples, two box doors 3 are closed, a metering heating unit in the hot plate 4 is started, the hot plate 4 reaches a stable temperature, the inner sides and the outer sides of the two samples are in different temperature environments, the plurality of temperature sensors 8 detect the temperature change of the two sides of the two samples, and after a period of time, the temperature difference of the two sides of the two samples is obtained through the plurality of temperature sensors 8, the measurement heating unit through hot plate 4 obtains by the heat flux density through the sample, the thickness of sample is obtained in the measurement, thereby calculate composite insulation board's coefficient of heat conductivity, and show the result on the display of control box 2, after the detection, open two chamber doors 3, two cylinders 15 shrink and reset, drive two clamp plates 7 and two samples and break away from, double-end motor 12 operation, double-end motor 12 drives two push arms two 11 and two push arms 10 and extend and set level, outwards release two layer boards 6 and two sliders 9 along the spout of two support grooves 5, make two layer boards 6 send out the external world that detects cabinet 1 with two samples, make two sample pieces keep away from high temperature hot plate 4, scald the workman when avoiding taking out the sample piece, take out the sample and put on the frame and cool off.

Example 2

As shown in fig. 1 to 3, the detection device further comprises an air conditioner 17, the air conditioner 17 is installed on the detection cabinet 1, and an air outlet of the air conditioner 17 extends into a detection space of the detection cabinet 1; the bracket is characterized by further comprising two limiting blocks 18, a plurality of guide rods 19 and a plurality of springs 20, wherein the two limiting blocks 18 are respectively positioned at the front ends of the two bracket 5, the two limiting blocks 18 are respectively slidably mounted on the left side and the right side of the hot plate 4 through the plurality of guide rods 19, the plurality of springs 20 are respectively sleeved on the plurality of guide rods 19, one ends of the plurality of springs 20 are connected with the two limiting blocks 18, and the other ends of the plurality of springs 20 are connected with the left side and the right side of the hot plate 4;

when carrying out the continuous detection work, air conditioner 17 adjusts the temperature in the detection space of detection cabinet 1, and accelerate the hot plate 4 cooling, load two new samples back on two layer boards 6, the spring action of a plurality of springs 20 makes two stopper 18 push away two samples on two bracket 5's lateral wall, make and form certain clearance between two samples and the hot plate 4, make things convenient for the wind that air conditioner 17 blew out to reach the temperature regulation of two samples with the inside ambient temperature who detects cabinet 1 the same, later two clamp plates 7 compress tightly two samples on hot plate 4, two stopper 18, a plurality of guide bars 19 and a plurality of springs 20 are compressed, shorten the interval time that detects.

As shown in fig. 1 to 5, the instrument for detecting the thermal conductivity of a composite insulation board of the present invention, when in operation, vertically places two samples of the composite insulation board on two supporting plates 6 respectively, and pushes them into the inside of a detection cabinet 1, the two samples are pushed to the side walls of two brackets 5 by two stoppers 18 due to the elastic action of a plurality of springs 20, so that a gap is formed between the two samples and a hot plate 4, the temperature of the two samples is adjusted to be the same as the internal environment of the detection cabinet 1 by the wind blown from an air conditioner 17, then the moving ends of two cylinders 15 are operated to extend to push two pressing plates 7 to press the two samples against the left and right side walls of the hot plate 4, so that the probes of a plurality of temperature sensors 8 are in contact with the left and right side surfaces of the two samples respectively, the plurality of temperature sensors 8 detect the initial temperatures of the two sides of the two samples, and then two doors 3 are closed, starting a metering heating unit in a hot plate 4 to enable the hot plate 4 to reach stable temperature, enabling the inner sides and the outer sides of two samples to be in environments with different temperatures, enabling a plurality of temperature sensors 8 to detect temperature changes of the two sides of the two samples, obtaining temperature differences of the two sides of the two samples through the plurality of temperature sensors 8 after a period of time, obtaining heat flux density of the samples through the metering heating unit of the hot plate 4, measuring to obtain the thickness of the samples, calculating the heat conductivity coefficient of the composite heat-insulating plate, displaying results on a display of a control box 2, finally, opening the two box doors 3, contracting and resetting two air cylinders 15, driving two pressing plates 7 to be separated from the two samples, operating a double-head motor 12, driving two pushing arms II 11 and two pushing arms I10 to extend and level by the double-head motor 12, pushing out two supporting plates 6 and two sliding blocks 9 along sliding chutes of two supporting grooves 5, make two layer boards 6 send two samples out the external world of detecting cabinet 1 for two coupons keep away from high temperature's hot plate 4, take out the sample after put on the frame and cool off can.

The utility model discloses the main function who realizes does:

1, the sample can be automatically sent out, workers are prevented from being scalded by a hot plate, danger is reduced, and practicability is high;

2, the outer side surfaces of the two samples can be cooled, so that a larger initial temperature difference can be formed on the two sides of the samples, and the detection range is enlarged;

3, the air conditioner 17 adjusts the temperature of the detection space of the detection cabinet 1 and cools the hot plate 4, thereby shortening the time of the detection interval.

The utility model discloses a detector for detecting the heat conductivity of a composite heat-insulating board, the installation mode, the connection mode or the arrangement mode of the detector are all common mechanical modes, and the detector can be implemented as long as the beneficial effects can be achieved; the utility model discloses a detection cabinet 1, control box 2, chamber door 3, hot plate 4, clamp plate 7, temperature sensor 8, double-end motor 12, slide bar 14, cylinder 15, cooling tube 16, air conditioner 17, guide bar 19, spring 20 of composite insulation board thermal conductivity detector are for purchasing on the market, this industry technical staff only need according to its subsidiary operating specification install and operate can, and need not the technical staff in the field and pay out creative work.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A heat-conducting property detector for a composite heat-insulating plate comprises a detection cabinet (1), a control box (2) and box doors (3), wherein an air pump and electrical equipment are installed at the lower part of the detection cabinet (1), a detection space is arranged at the upper part of the detection cabinet (1), the control box (2) is installed on the detection cabinet (1), the control box (2) is provided with a display and an operation button, the two box doors (3) are hinged on the detection cabinet (1), and the detection space of the detection cabinet (1) is sealed by the two box doors (3); the device is characterized by further comprising a hot plate (4), a support groove (5), a discharging mechanism, two support plates (6), clamping mechanisms, a pressing plate (7) and a plurality of temperature sensors (8), wherein the hot plate (4) is installed in the middle of a detection space of the detection cabinet (1), a metering heating unit is arranged in the middle of the hot plate (4), the bottom of the left side wall and the bottom of the right side wall of the hot plate (4) are both provided with the support groove (5), the discharging mechanism is installed at the lower rear part of the hot plate (4), the discharging mechanism comprises the two support plates (6), the two support plates (6) are respectively installed in the two support grooves (5) in a sliding mode, the discharging mechanism sends samples out of the outside of the detection cabinet (1) through the two support plates (6), the two clamping mechanisms are respectively installed at the left side and the right side of the hot plate (4), the two clamping mechanisms comprise the pressing plate (7), the two samples are pressed on the two hot plates (4) by the two pressing plates (7), the left side wall and the right side wall of the two pressing plates (7) are both provided with the plurality of the temperature sensors (8), and the temperature sensors (8) are used for detecting the temperature of the two sides of the samples.

2. The instrument for detecting the heat conductivity of the composite insulation board according to claim 1, wherein the discharging mechanism comprises two supporting plates (6), two sliding blocks (9), two pushing arms I (10), two pushing arms II (11) and a double-head motor (12), sliding grooves are formed in the upper end surfaces of two supporting grooves (5), sliding blocks (9) are arranged on the lower end surfaces of the two supporting plates (6), the two sliding blocks (9) are connected with the sliding grooves of the two supporting grooves (5) in a sliding mode, the lower ends of the two pushing arms I (10) are respectively connected with the inner ends of the two supporting plates (6) in a rotating mode, the upper ends of the two pushing arms I (10) are respectively connected with the upper ends of the two pushing arms II (11) in a rotating mode, the double-head motor (12) is installed on the rear portion of the heating board (4), a rotor driving shaft of the double-head motor (12) extends out of the front end and the rear end of the double-head motor (12), and the lower ends of the two pushing arms II (11) are respectively connected with the front end and the rear end of the driving shaft of the double-head motor (12).

3. The instrument for detecting the heat conductivity of the composite heat-insulating board according to claim 1, wherein the clamping mechanism comprises a pressing plate (7), two mounting frames (13), a plurality of sliding rods (14) and a cylinder (15), the two mounting frames (13) are mounted on the inner wall of the detection space of the detection cabinet (1), the plurality of sliding rods (14) are respectively slidably mounted on the two mounting frames (13), the pressing plate (7) is mounted on the inner ends of the plurality of sliding rods (14), the fixed end of the cylinder (15) is mounted on the two mounting frames (13) through a support, the moving end of the cylinder (15) is connected with the pressing plate (7), and the pressing plate (7) is located between the heating plate (4) and the two mounting frames (13).

4. The instrument for detecting the heat conductivity of the composite heat-insulating board according to claim 3, further comprising two cooling pipes (16), wherein the cooling pipes (16) are arranged inside the two pressing plates (7).

5. The instrument for detecting the heat-conducting property of the composite heat-insulating board according to claim 1, further comprising an air conditioner (17), wherein the air conditioner (17) is installed on the detection cabinet (1), and an air outlet of the air conditioner (17) extends into a detection space of the detection cabinet (1).

6. The instrument for detecting the heat conductivity of the composite heat-insulating board according to claim 1, further comprising two limit blocks (18), a plurality of guide rods (19) and a plurality of springs (20), wherein the two limit blocks (18) are respectively located at the front ends of the two brackets (5), the two limit blocks (18) are respectively slidably mounted on the left side and the right side of the heat plate (4) through the plurality of guide rods (19), the plurality of springs (20) are respectively sleeved on the plurality of guide rods (19), one ends of the plurality of springs (20) are connected with the two limit blocks (18), and the other ends of the plurality of springs (20) are connected with the left side and the right side of the heat plate (4).

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