Device for testing heat resistance of front tile of automobile headlamp
By using a combination of water heating and pressure mechanisms in the heat resistance testing device for automotive headlight front tiles, the problem of unstable temperature of material workpieces at high temperatures was solved, and high-precision heat resistance testing was achieved.
Patent Information
- Application Number
- CN202511512026.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-01-16
AI Technical Summary
Existing automotive headlight materials exhibit unstable temperatures during high-temperature testing, making it difficult to accurately determine their high-temperature resistance. Furthermore, traditional flame heating methods are unstable.
Water heating is used to fill the pressure chamber with water and heat it to over 100 degrees Celsius. Pressure is then applied to the material workpiece using a pressure mechanism, and deformation is observed through an observation window to ensure temperature stability and pressure continuity.
It enables stable heating and deformation detection of material workpieces at different temperatures, improving detection accuracy and stability, and can collect data on material deformation at different temperatures.
Smart Images
Figure CN121347580A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of automobile accessory testing, in particular to a heat resistance testing device for automobile headlamp front cover. BACKGROUND
[0002] The material of automobile headlamp is various, including transparent plastic, glass, acrylic plate or synthetic material. Since the environment of automobile is extremely cold or extremely hot, and the temperature of automobile can reach very high temperature after being exposed to the sun in the desert environment, the synthetic material automobile headlamp needs to be tested for high temperature resistance. After being exposed to the sun, the automobile headlamp will soften and deform by its own gravity, and the high temperature deformation needs a long time, so a special equipment is needed for long time testing. The temperature control of the material sheet used by the testing equipment is not stable enough, usually flame heating is adopted, which can make the temperature of the material sheet high and low, so it is difficult to master the accurate parameters of the material sheet high temperature resistance. SUMMARY
[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and provide a heat resistance testing device for automobile headlamp front cover. When the device is used, the inside of the pressure-resistant box is filled with water, and then the pressure-resistant cover plate is assembled, which can make the pressure-resistant box and the pressure-resistant cover form a closed state, and the water in the pressure-resistant box can be heated to more than 100 degrees Celsius, and the material workpiece will be heated in water. This heating method has higher stability than drying method, and the specific heat capacity of water is larger than that of air, so the temperature of the material workpiece in the hot water environment will not change suddenly, and the pressure mechanism continuously applies pressure to the material workpiece, so the workers can collect the deformation of the material workpiece at different temperatures, so as to solve the problems mentioned in the background art.
[0004] To solve the above problems, the present application provides the following technical scheme: a heat resistance testing device for automobile headlamp front cover, comprising a pressure-resistant box and a pressure-resistant cover plate, the edges of the pressure-resistant box and the pressure-resistant cover plate are connected by hinges, and the pressure-resistant box and the pressure-resistant cover plate are connected in airtight manner; the inside of the pressure-resistant box is provided with a pressure sensor and a temperature sensor, the inside of the pressure-resistant box is filled with water, the inside of the pressure-resistant box is filled with a material workpiece, and the material workpiece is arranged on a pressure mechanism, the top end of the pressure-resistant cover plate is provided with a pressure driving mechanism, the inside of the pressure-resistant box is provided with a sandwich layer, and the inside of the sandwich layer is provided with an electric heating wire for heating.
[0005] In use, after filling the inside of the pressure box with water, the pressure cover is assembled, which makes the pressure box and the pressure cover form a closed state, and the water in the pressure box can be heated to more than 100 DEG C, and the material workpiece is heated in the water, and the specific heat capacity of water is larger than that of air, so that the temperature of the material workpiece in the hot water environment will not change suddenly, and the pressure mechanism continuously applies pressure to the material workpiece, and the worker can collect the deformation of the material workpiece at different temperatures.
[0006] Further, one side of the pressure box is provided with an observation window, and the inside of the observation window is filled with airtight tempered glass.
[0007] In use, the worker observes the deformation of the material workpiece through the observation window, and the pressure sensor and the temperature sensor can detect the pressure and the temperature of the pressure box.
[0008] Further, the top opening of the pressure box is provided with a sealing rubber strip, and the bottom edge of the pressure cover is provided with a matching airtight annular groove.
[0009] In use, the sealing rubber strip and the airtight annular groove are tightly matched, which can make the inside of the pressure box bear higher pressure, so that the water can be heated to more than 100 DEG C.
[0010] Further, the pressure mechanism comprises an internal guide rail fixedly installed in the pressure box, two combined sliding blocks are slidably installed on the internal guide rail, a vertical rod is arranged below the middle position of the internal guide rail, a pressing sliding sleeve is slidably arranged on the vertical rod, the left and right side walls of the pressing sliding sleeve are respectively connected with the two combined sliding blocks through pressure guide rods, the two ends of the pressure guide rods are respectively hinged with the combined sliding blocks and the side walls of the pressing sliding sleeve, a surrounding rod is arranged on one side of the pressing sliding sleeve, a pressure ball is arranged at the bottom end of the surrounding rod, the pressure ball is pressed on the top surface of the material workpiece, and the material workpiece is placed on the top end of the pressing cylinder.
[0011] In use, when the combined sliding blocks are pushed to the middle and pressure is applied, the pressure guide rods will exert downward pressure on the pressing sliding sleeve, and at this time the surrounding rod and the pressure ball will exert constant pressure on the material workpiece for a long time, and the worker can observe the deformation of the material workpiece.
[0012] Further, the pressure driving mechanism comprises an external guide rail fixedly arranged at the top end of the pressure cover, an expansion sliding block is slidably arranged on the external guide rail, a strong magnet is arranged on one side of the expansion sliding block, an iron block is arranged on the side wall of the combined sliding block, the iron block is respectively attracted to the opposite position of the strong magnet, and a combined pulling mechanism is arranged at the top end of the expansion sliding block.
[0013] In use, the power to push the slider to the middle can be applied from the top of the pressure-resistant cover plate, the strong magnet on the side wall of the expansion slider has stronger attraction to the iron block, which can pull the strong magnet to the iron block without contact, so as to ensure the sealing of the pressure-resistant box.
[0014] Further, the merging pulling mechanism includes a vertical plate at the middle position of the external guide rail, a sliding sleeve is sleeved on the vertical plate, the left and right side walls of the sliding sleeve are connected with the two expansion sliders through driving guide rods respectively, the two ends of the driving guide rods are hinged with the sliding sleeve and the expansion sliders respectively, two rollers are rotationally arranged at the top end of the vertical plate, a counterweight rope is pulled out from the side wall of the sliding sleeve and passes through the two rollers, and a magnetic attraction weight is arranged at the bottom end of the roller.
[0015] In use, the counterweight rope applies pulling force to the sliding sleeve, the direction of the force can be changed after the counterweight rope passes through the two rollers, and the pressure of the counterweight rope can be provided by the magnetic attraction weight.
[0016] Further, the pressure mechanism includes a fixed frame and a lifting frame, the fixed frame is fixedly connected with the bottom of the pressure-resistant box, five fixed horizontal rods in a one-dimensional array are arranged at the top end of the fixed frame, four movable horizontal rods in a one-dimensional array are arranged on the side wall of the lifting frame, the fixed horizontal rods and the movable horizontal rods intersect in the vertical direction, a sliding sheet is arranged on the side wall of the lifting frame opposite to the movable horizontal rods, two vertical columns are arranged on the side wall of the fixed frame, the sliding sheet is sleeved on the vertical columns, and the material workpiece is placed in the gap between the fixed horizontal rods and the movable horizontal rods.
[0017] In use, the material workpiece is placed in the gap between the fixed horizontal rods and the movable horizontal rods, the movable horizontal rods apply pressure by being pressed downward by their own pressure, the material workpiece can be twisted to form a wave shape, and then the anti-twisting performance of the material workpiece under high temperature can be detected.
[0018] Further, the pressure driving mechanism includes a counterweight block at the top end of the lifting frame, a pull line is connected to the top end of the counterweight block, a pull ring is arranged at the top end of the pull line, a gas-tight cylinder is fixedly arranged at the top end of the pressure-resistant cover plate, a tapered channel is arranged in the gas-tight cylinder, a rubber cone is arranged in the tapered channel, a threading channel is arranged in the rubber cone, and the pull line passes through the threading channel.
[0019] In use, after the material workpiece is placed in the gap between the fixed horizontal rods and the movable horizontal rods, the rubber cone in the tapered channel is pulled out, at this time, the pull line can move freely in the threading channel, the pull line is kept in a relaxed state, the rubber cone is pressed back, the lifting frame and the counterweight block apply pressure downward by their own gravity, and when the rubber cone is pressed in the tapered channel, the rubber cone is squeezed and locked in the threading channel to be airtight and have no air permeability, so that the air pressure in the pressure-resistant box can be kept stable.
[0020] Compared with the prior art, the embodiment of the application has the following beneficial effects: Firstly, when the device is in use, the anti-pressure box is filled with water, and then the anti-pressure cover plate is assembled, which can make the anti-pressure box and the anti-pressure cover form a closed state, and the water in the anti-pressure box can be heated to more than 100 degrees Celsius, and the material workpiece will be heated in the water. This heating method has higher stability than the drying method. The specific heat capacity of water is larger than that of air, and the temperature of the material workpiece in the hot water environment will not change suddenly. The pressure mechanism continuously applies pressure to the material workpiece, and the worker can collect the deformation of the material workpiece at different temperatures.
[0021] Secondly, the power of the combined slider pushing to the middle can be applied from the top of the anti-pressure cover plate. The strong magnet on the side wall of the expansion slider has stronger attraction to the iron block, which can pull the iron block without contact to ensure the sealing of the anti-pressure box. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a schematic view of the present application.
[0023] Figure 2 is a schematic view of the present application.
[0024] Figure 3 is a schematic view of the present application Figure 2 A partial enlarged view.
[0025] Figure 4 is a schematic view of the present application.
[0026] Figure 5 is a schematic view of the present application.
[0027] Figure 6 is a schematic view of the second embodiment of the present application.
[0028] Figure 7 is a schematic view of the second embodiment of the present application.
[0029] Figure 8 is a schematic view of the present application.
[0030] Figure 9 is a schematic view of the present application.
[0031] BRIEF DESCRIPTION OF DRAWINGS: Anti-pressing box 1, observation window 101, anti-pressing cover plate 2, external guide rail 3, vertical plate 301, sliding cylinder 302, driving guide rod 303, roller 304, counterweight rope 305, magnetic weight 306, expansion sliding block 4, strong magnet 401, internal guide rail 5, iron block 501, pressure guide rod 502, pressure sliding sleeve 503, vertical rod 504, surrounding rod 505, pressure ball 506, pressure fitting square cylinder 6, material workpiece 601, air-tight cylinder 7, rubber cone 701, fixing frame 8, fixed cross rod 801, vertical column 802, lifting frame 9, movable cross rod 901, sliding piece 902, counterweight block 903, pull wire 904, pull ring 905. DETAILED DESCRIPTION
[0032] Unless otherwise defined, 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 application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that the terms "comprises" and "comprising", or "includes" and "including" when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, or groups thereof.
[0033] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a common alternative embodiment. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment even though it is not mentioned expressly.
[0034] The application provides a kind of automobile headlamp front tile heat resistance testing device, including anti-pressing box 1 and anti-pressing cover plate 2, as shown in Figures 1-9 The edge of the anti-pressing box 1 and the anti-pressing cover plate 2 is connected by hinge, and the anti-pressing box 1 and the anti-pressing cover plate 2 are connected airtight; The inside of the anti-pressing box 1 is provided with pressure sensor and temperature sensor, the inside of the anti-pressing box 1 is filled with water, the inside of the anti-pressing box 1 is loaded with material workpiece 601, and the material workpiece 601 is arranged on the pressure mechanism, the top of the anti-pressing cover plate 2 is provided with pressure driving mechanism, the inside of the anti-pressing box 1 is provided with interlayer, and the interlayer is provided with electric heating wire for heating.
[0035] In the embodiment, after the inside of the pressure-resistant box 1 is filled with water, the pressure-resistant cover plate 2 is assembled, so that the pressure-resistant box 1 and the pressure-resistant cover 2 are in a sealed state, the water in the pressure-resistant box 1 can be heated to more than 100 DEG C, and the material workpiece is heated in the water, the heating mode has higher stability compared with the drying mode, the specific heat capacity of the water is larger than that of the air, and therefore the temperature of the material workpiece in the hot water environment cannot be changed suddenly, the pressure mechanism continuously applies pressure to the material workpiece 601, and the worker can collect the deformation of the material workpiece 601 at different temperatures.
[0036] In further embodiments of the present application, as shown in Figure 1 The pressure-resistant box 1 is provided with an observation window 101 on one side, and the inside of the observation window 101 is filled with airtight tempered glass.
[0037] In the embodiment, the worker observes the deformation of the material workpiece through the observation window 101, and the pressure sensor and the temperature sensor can detect the pressure and the temperature of the pressure-resistant box 1.
[0038] In further embodiments of the present application, as shown in Figures 1-6 The top opening of the pressure-resistant box 1 is provided with a sealing rubber strip, and the bottom edge of the pressure-resistant cover plate 2 is provided with a matching airtight annular groove.
[0039] In the embodiment, the sealing rubber strip and the airtight annular groove are tightly matched, so that the inside of the pressure-resistant box can withstand higher pressure, and the water can be heated to more than 100 DEG C.
[0040] In further embodiments of the present application, as shown in Figures 1-5 The pressure mechanism comprises an inner guide rail 5 fixedly installed in the pressure-resistant box 1, two combined sliding blocks are slidably installed on the inner guide rail 5, a vertical rod 504 is arranged below the middle position of the inner guide rail 5, a pressing sliding sleeve 503 is slidably arranged on the vertical rod 504, the left and right side walls of the pressing sliding sleeve 503 are connected with the two combined sliding blocks through a pressure guide rod 502, the two ends of the pressure guide rod 502 are hinged with the combined sliding blocks and the side walls of the pressing sliding sleeve 503, a surrounding rod 505 is arranged on one side of the pressing sliding sleeve 503, a pressure ball 506 is arranged at the bottom end of the surrounding rod 505, the pressure ball 506 is pressed on the top surface of the material workpiece 601, and the material workpiece 601 is placed on the top end of the pressing square cylinder 6.
[0041] In the embodiment, when the combined sliding block 4 is pushed to the middle and pressure is applied, the pressure guide rod 502 applies downward pressure to the pressing sliding sleeve 503, and at this time, the surrounding rod 505 and the pressure ball 506 apply constant pressure to the material workpiece 601 for a long time, and the worker observes the deformation of the material workpiece 601.
[0042] In further embodiments of the present application, as shown in Figures 1-5 The pressure driving mechanism comprises an external guide rail 3 fixed at the top of the pressure-resistant cover plate 2, and an expansion sliding block 4 is slidably arranged on the external guide rail 3. A strong magnet 401 is arranged on one side of the expansion sliding block 4. An iron block 501 is arranged on the side wall of the expansion sliding block 4. The iron block 501 is attracted to the strong magnet 401 at the opposite position. A combined pulling mechanism is arranged at the top of the expansion sliding block 4.
[0043] In the embodiment, the power for pushing the combined sliding block to the middle can be applied from the top of the pressure-resistant cover plate 2. The strong magnet 401 on the side wall of the expansion sliding block 4 has a stronger attraction to the iron block 501, which can enable the strong magnet 401 to pull the iron block 501 without contact, thereby ensuring the airtightness of the pressure-resistant box 1.
[0044] In further embodiments of the present application, as shown in Figures 7-9 The combined pulling mechanism comprises a vertical plate 301 at the middle position of the external guide rail 3. A sliding cylinder 302 is slidably sleeved on the vertical plate 301. The left and right side walls of the sliding cylinder 302 are connected to the two expansion sliding blocks 4 through driving guide rods 303. The two ends of the driving guide rods 303 are hingedly connected to the sliding cylinder 302 and the expansion sliding blocks 4, respectively. Two rollers 304 are rotatably arranged at the top of the vertical plate 301. A counterweight rope 305 is pulled out from the side wall of the sliding cylinder 302 and passes through the two rollers 304. Magnetic weight 306 is arranged at the bottom of the rollers 304.
[0045] In the embodiment, the counterweight rope 305 applies a pulling force to the sliding cylinder 302. After the counterweight rope 305 passes through the two rollers 304, the direction of the force can be changed, and the pressure of the counterweight rope 305 can be provided by the magnetic weight 306.
[0046] In further embodiments of the present application, as shown in Figures 7-9 The pressure mechanism comprises a fixed frame 8 and a lifting frame 9. The fixed frame 8 is fixedly connected to the bottom of the pressure-resistant box 1. Five fixed horizontal rods 801 in a one-dimensional array are arranged at the top of the fixed frame 8. Four movable horizontal rods 901 in a one-dimensional array are arranged on the side wall of the lifting frame 9. The fixed horizontal rods 801 and the movable horizontal rods 901 intersect in the vertical direction. A sliding sheet 902 is arranged on the side wall of the lifting frame 9 opposite to the movable horizontal rods 901. Two vertical columns 802 are arranged on the side wall of the fixed frame 8. The sliding sheet 902 is slidably sleeved on the vertical columns 802. The material workpiece 601 is placed in the gap between the fixed horizontal rods 801 and the movable horizontal rods 901.
[0047] In the embodiment, the material workpiece 601 is placed in the gap between the fixed crossbar 801 and the movable crossbar 901, the movable crossbar 901 is pressed downward by the pressure of the movable crossbar 901, the material workpiece 601 can be twisted to form a wave shape, and then the anti-twist performance of the material workpiece 601 under high temperature can be detected.
[0048] In further embodiments of the present application, as shown in Figures 7-9 The pressure driving mechanism comprises a counterweight 903 at the top end of the lifting frame 9, a pull wire 904 connected to the top end of the counterweight 903, a pull ring 905 arranged at the top end of the pull wire 904, a gas-tight cylinder 7 fixedly arranged at the top end of the pressure-resistant cover plate 2, a tapered channel arranged in the gas-tight cylinder 7, a rubber cone 701 arranged in the tapered channel, and a threading channel arranged in the rubber cone 701, wherein the pull wire 904 passes through the threading channel.
[0049] In the embodiment, after the material workpiece 601 is placed in the gap between the fixed crossbar 801 and the movable crossbar 901, the rubber cone 701 in the tapered channel is pulled out, at this time, the pull wire 904 can freely move in the threading channel, the pull wire 904 is kept in a relaxed state, the rubber cone 701 is pressed back, the lifting frame 9 and the counterweight 903 apply pressure downward by the gravity of the lifting frame 9 and the counterweight 903, and when the rubber cone 701 is pressed in the tapered channel, the rubber cone 701 is squeezed and locked in the threading channel to make the threading channel airtight and not breathable, so that the air pressure in the pressure-resistant box 1 is kept stable.
[0050] It should be noted that, for the foregoing embodiments, in order to simply describe, the foregoing embodiments are described as a series of action combinations, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.
[0051] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic. The division of the above units can be different during actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the display or discussion of the coupling or communication connection between the units can be indirect coupling or communication connection through some interfaces, or direct coupling or communication connection between the units, which can be electrical, or other forms.
[0052] The units described as separate components above can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the units can be selected to achieve the purposes of the embodiments of the present application according to actual needs.
[0053] The above embodiments are only used to illustrate the technical solutions of the present application, and do not limit the protection scope of the application. Obviously, the described embodiments are only some, but not all of the embodiments of the present application. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of the present application. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still make modifications to the features of the embodiments of the present application according to the situation without conflict, and without creative work, to combine, delete or make other adjustments to the features of the embodiments of the present application according to the situation, so as to obtain different, but essentially not deviating from the concept of the present application. Other technical solutions, which also belong to the scope of protection of the present application.
Claims
1. An automobile headlamp front wall heat resistance testing device, comprising a pressure-resistant box (1) and a pressure-resistant cover plate (2), characterized in that: The edges of the pressure-resistant box (1) and the pressure-resistant cover plate (2) are connected through a hinge, and the pressure-resistant box (1) and the pressure-resistant cover plate (2) are air-tightly connected; The inside of the pressure-resistant box (1) is provided with a pressure sensor and a temperature sensor, the inside of the pressure-resistant box (1) is filled with water, the pressure-resistant box (1) is filled with a material workpiece (601), and the material workpiece (601) is arranged on a pressure mechanism, the top end of the pressure-resistant cover plate (2) is provided with a pressure driving mechanism, and the inside of the pressure-resistant box (1) is provided with a sandwich layer, and the inside of the sandwich layer is provided with an electric heating wire for heating.
2. A heat resistance testing device for a front lens of an automobile headlamp according to claim 1, characterized in that: One side of the pressure-resistant box (1) is provided with an observation window (101), and the inside of the observation window (101) is filled with a gas-tight tempered glass.
3. The heat resistance testing device for the front lens of an automobile headlamp according to claim 1, wherein: The top opening of the pressure-resistant box (1) is provided with a sealing rubber strip, and the bottom edge of the pressure-resistant cover plate (2) is provided with a gas-tight annular groove matched with the sealing rubber strip.
4. The heat resistance testing device for the front lens of an automobile headlamp according to claim 1, wherein: The pressure mechanism comprises an inner guide rail (5) fixedly installed in the pressure-resistant box (1), two combined sliding blocks are slidably installed on the inner guide rail (5), a vertical rod (504) is arranged below the middle position of the inner guide rail (5), a pressing sliding sleeve (503) is slidably arranged on the vertical rod (504), the left and right side walls of the pressing sliding sleeve (503) are connected with the two combined sliding blocks through pressure guide rods (502), respectively, the two ends of the pressure guide rods (502) are hinged with the combined sliding blocks and the side walls of the pressing sliding sleeve (503), respectively, one side of the pressing sliding sleeve (503) is provided with a surrounding rod (505), the bottom end of the surrounding rod (505) is provided with a pressure ball (506), the pressure ball (506) is pressed on the top surface of the material workpiece (601), and the material workpiece (601) is placed on the top end of the pressing square cylinder (6).
5. A heat resistance testing device for a front lens of an automobile headlamp according to claim 4, wherein: The pressure driving mechanism comprises an outer guide rail (3) fixedly arranged at the top end of the pressure-resistant cover plate (2), an expansion sliding block (4) is slidably arranged on the outer guide rail (3), a strong magnet (401) is arranged on one side of the expansion sliding block (4), an iron block (501) is arranged on the side wall of the combined sliding block, the iron block (501) is respectively attracted to the opposite strong magnet (401), and the top end of the expansion sliding block (4) is provided with a combined pulling mechanism.
6. A heat resistance testing device for a front lens of an automobile headlamp according to claim 5, wherein: The combined pulling mechanism comprises a vertical plate (301) at the middle position of the outer guide rail (3), a sliding cylinder (302) is slidably sleeved on the vertical plate (301), the left and right side walls of the sliding cylinder (302) are connected with the two expansion sliding blocks (4) through drive guide rods (303), respectively, the two ends of the drive guide rods (303) are hinged with the sliding cylinder (302) and the expansion sliding blocks (4), respectively, two rollers (304) are rotationally arranged at the top end of the vertical plate (301), a counterweight rope (305) is pulled out from the side wall of the sliding cylinder (302) and passes around the two rollers (304), and the bottom end of the roller (304) is provided with a magnetic attraction weight (306).
7. The heat resistance testing device for the front lens of an automobile headlamp according to claim 1, wherein: The pressure mechanism comprises a fixed frame (8) and a lifting frame (9), the fixed frame (8) is fixedly connected with the bottom of the pressure-resistant box (1), the top end of the fixed frame (8) is provided with five fixed horizontal rods (801) in a one-dimensional array, the side wall of the lifting frame (9) is provided with four movable horizontal rods (901) in a one-dimensional array, the fixed horizontal rods (801) and the movable horizontal rods (901) are crossed in the vertical direction, the side wall of the lifting frame (9) opposite to the movable horizontal rods (901) is provided with a sliding piece (902), the side wall of the fixed frame (8) is provided with two vertical columns (802), the sliding piece (902) is slidably sleeved on the vertical columns (802), and the material workpiece (601) is placed in the gap between the fixed horizontal rods (801) and the movable horizontal rods (901).
8. The heat resistance testing device for the front lens of an automobile headlamp according to claim 7, characterized in that: The pressure driving mechanism comprises a counterweight (903) at the top end of the lifting frame (9), the top end of the counterweight (903) is connected with a pull line (904), the top end of the pull line (904) is provided with a pull ring (905), the top end of the pressure-resistant cover plate (2) is fixedly provided with an airtight cylinder (7), the inside of the airtight cylinder (7) is provided with a conical channel, the inside of the conical channel is provided with a rubber cone (701), the inside of the rubber cone (701) is provided with a threading channel, and the pull line (904) passes through the threading channel.