Polystyrene colorimetric measurement device and method

Abstract

The present invention relates to a polystyrene colorimetric device and method for use in the field of polystyrene resins. The device comprises a measuring device body, a driving motor mounted on one side of a top surface of a partition, a lead screw connected to an output end of the driving motor, a threaded sleeve sleeved on a surface of the lead screw, an electromagnetic ring sleeved on an outer surface of the threaded sleeve, a plug-in rod fixedly connected to a surface of the electromagnetic ring, a cleaning rod slidably fitted on a surface of a placement slot, the cleaning rod comprising an inner rod and a sponge sleeve, and a spring bar movably connected to an end of the inner rod adjacent to the electromagnetic ring. In the polystyrene colorimetric device, a combined horizontal and vertical cleaning effect is achieved on the surface of a sample sheet to ensure the accuracy of the measurement result. In addition, during the measurement process, by comparing the fluctuations and change trends of L values, a values, and b values, the color change of the product is determined, the control ranges of the a values and b values are set, and the color stability of the product is improved.

Description

Technical Field

[0001] The present invention relates to a polystyrene colorimetric device, in particular to a polystyrene colorimetric device and method applied to the field of polystyrene resins. Background Art

[0002] Polystyrene refers to a polymer synthesized from styrene monomers through free radical addition polymerization. It is a colorless and transparent thermoplastic plastic and is often used to make various disposable containers that need to withstand the temperature of boiling water, as well as disposable foam lunch boxes. When producing polystyrene products, color testing is required.

[0003] The specification of Chinese invention patent CN201710971524.9 discloses a non-contact colorimetric detection device and method capable of simultaneous multispectral measurement without contaminating either the sensor or the liquid being measured, overcoming the shortcomings of photometric electrodes in the prior art. The device comprises a transparent reaction vessel, a multispectral light source disposed directly above or on the outside of the sidewall of the reaction vessel, a full-color light sensor for receiving light transmitted from the multispectral light source, and a multispectral light source switching device with an output end connected to a multispectral light source control end; at least two full-color light sensors are provided, distributed simultaneously directly below or on the outside of the sidewall of the reaction vessel and arranged opposite the multispectral light source, with the multispectral light source and full-color light sensor being arranged in a non-contact manner with the reaction vessel; and a signal processing system connected to the output end of the full-color light sensor, the signal processing system being configured to simultaneously receive optical signals from multiple channels.

[0004] When existing colorimetry equipment is in operation, fingerprints or other marks will inevitably be left on the surface of the polystyrene sample when it is placed on the sample, affecting the reflection result of the polystyrene sample surface, thereby causing inaccurate colorimetry results. In addition, when testing the colorimetry of polystyrene, the yellowness index YI is usually used to represent it. It is usually determined by the three stimulus values of X, Y, and Z. It is the result of a comprehensive calculation. This often causes the actual color of products with the same YI value to deviate. It also cannot intuitively reflect changes in the amount of blue agent added during the production process, product oxidation during the production process, etc., further increasing the inaccuracy of the polystyrene colorimetry results. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to provide a measuring device with accurate measurement results when performing colorimetric measurement on polystyrene.

[0006] To address the above-mentioned problems, the present invention provides a polystyrene colorimetric device, comprising a measuring device body, a light source being embedded in the top surface of the measuring device body, a sample measuring frame being slidably mounted within the measuring device body and positioned directly below the light source, a plurality of RGB color sensors being mounted on the inner bottom wall of the sample measuring frame, a partition made of a transparent material being mounted on the inner wall of the sample measuring frame and positioned above the RGB color sensors, a placement slot being centrally located within the partition, and a plurality of sample sheets corresponding to the RGB color sensors being placed within the placement slot, the sample sheets being spliced together by heat insulation sheets.

[0007] A driving motor is installed on one side of the top surface of the partition, and the output end of the driving motor is connected to a lead screw, a threaded sleeve is sleeved on the surface of the lead screw, an electromagnetic ring is sleeved on the outer surface of the threaded sleeve, a plug-in rod is fixedly connected to the surface of the electromagnetic ring, a cleaning rod is slidably fitted on the surface of the placement groove, the cleaning rod includes an inner rod and a sponge sleeve sleeved on the outer surface of the inner rod, the surface of the inner rod close to the electromagnetic ring is coated with a magnetic coating that attracts the electromagnetic ring, the end of the inner rod close to the electromagnetic ring is provided with an annular groove matching the plug-in rod, the end of the inner rod close to the electromagnetic ring is movably connected to a spring bar, and the tail end of the spring bar is fixedly connected to the surface of the electromagnetic ring;

[0008] The length of the sponge cover is greater than the length of the placement groove, and the surface of the sponge cover is in contact with the top surface of the sample sheet. The length of the cleaning rod is less than the cross-sectional length of the partition.

[0009] In the polystyrene colorimetric device, a comprehensive cleaning effect in both horizontal and vertical directions is achieved on the surface of the sample sheet, thereby ensuring the accuracy of the measurement results.

[0010] As a further improvement of the present application, the light source is a C2 light source, and the cross-sectional area of the light source is not larger than the cross-sectional area of the placement groove.

[0011] As a further improvement of the present application, the depth of the annular groove is greater than the length of the plug-in rod, and in the initial state, there is a gap between the surface of the electromagnetic ring and the end of the inner rod where the annular groove is provided.

[0012] As a further improvement of the present application, a displacement sensor is installed inside the electromagnetic ring, and the displacement sensor is connected to the electromagnetic ring signal.

[0013] As a further improvement of the present application, a display is installed on the top surface of the measuring device body, and the display is connected to the RGB color sensor signal.

[0014] As another improvement of the present application, the sponge sleeve includes an elastic member centrally arranged at the top end of the inner rod, sponge sheets are connected to both ends of the elastic member, the ends of the two sponge sheets close to each other are embedded in and connected with electromagnetic suction blocks that attract each other, and a heating arc sheet is embedded in and connected at the center position of the bottom surface of the inner rod, and the heating arc sheet is located above the sample sheet.

[0015] As another improved supplement to the present application, the cross-sectional length of the electromagnetic suction block is smaller than the cross-sectional length of the sponge sheet, and the cross-sectional length of the heating arc sheet is smaller than the length of the sponge sheet. An auxiliary ring located on the outside of both ends of the heating arc sheet is installed inside the elastic part, and the surface of the auxiliary ring near the lower position is symmetrically provided with magnetic suction areas, and the magnetic suction areas on both sides respectively attract each other with the two electromagnetic suction blocks.

[0016] As another improved supplement to the present application, when the electromagnetic suction block is powered off, the arc length between the tail ends of the two sponge pieces is greater than the arc length of the heating arc piece, and when the electromagnetic suction block is powered on, the sum of the cross-sectional arc lengths of the two sponge pieces is not less than two-thirds of the overall cross-sectional arc length of the sponge sleeve.

[0017] A method for using a polystyrene colorimeter comprises the following steps:

[0018] S1. Multiple polystyrene sample sheets to be tested are spliced together using a heat-insulating sheet, and then placed in a placement slot. The sample measurement frame is then placed in the measurement device body.

[0019] S2. Start the driving motor to drive the threaded sleeve and the electromagnetic ring to move back and forth along the surface of the lead screw. Under the connection between the plug rod and the inner rod, the sponge sleeve is driven to clean the surface of the sample piece;

[0020] S3. When cleaning the sample, the electromagnetic ring is periodically activated, so that the inner rod and the sponge cover on the surface can move horizontally on the surface of the sample and vibrate vertically with a small amplitude, so that the sponge cover can comprehensively clean the surface of the sample in the horizontal and vertical directions;

[0021] S4. After cleaning, start the light source and cooperate with the heating arc to detect the changes in L, a, and b values in the sample under different temperature factors.

[0022] In summary, by utilizing the coordination of the lead screw, electromagnetic ring, inner rod and sponge sleeve, a comprehensive cleaning effect combining horizontal and vertical directions on the surface of the sample piece is achieved to ensure the accuracy of the measurement results. At the same time, the original chromaticity test method is changed to the L, a, and b value test under the C light source. By comparing the fluctuations and change trends of the L value, a value, and b value, the color change of the product is determined. The control range of the a value and b value is set to control the color fluctuation range of the product, thereby improving the color stability of the product and thus improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall structure of the first and second implementation methods of this application;

[0024] Figure 2 This is a diagram showing the internal structure of the sample measurement frame according to the first and second embodiments of the present application;

[0025] Figure 3 Schematic diagram of the installation of the spring bar, the plug-in rod, the electromagnetic ring and the threaded sleeve of the first and second embodiments of the present application;

[0026] Figure 4 This is a schematic diagram of the installation of the inner rod, sponge sleeve, annular groove and plug-in rod in the first embodiment of the present application;

[0027] Figure 5 Schematic diagram of the spring bar and the plug-in rod in the initial state of the first and second embodiments of the present application;

[0028] Figure 6 Schematic diagram of the state of the spring strip and the plug-in rod during longitudinal cleaning of the first and second embodiments of the present application;

[0029] Figure 7 This is a cross-sectional view of a sponge cover and a heating arc ring according to a second embodiment of the present application;

[0030] Figure 8 This is a diagram showing the state of the elastic member of the second embodiment of the present application when the heating arc ring is exposed after being reset;

[0031] Figure 9 This is a state diagram of the heating arc ring when it moves to different sample surfaces according to the second embodiment of the present application.

[0032] Description of the numbers in the figure:

[0033] 1. Measuring device body; 2. Light source; 3. Sample measuring frame; 4. Sample sheet; 5. Lead screw; 6. Drive motor; 7. Heat insulation sheet; 8. Placement slot; 9. RGB color sensor; 10. Sponge cover; 11. Connecting rod; 12. Spring bar; 13. Threaded sleeve; 14. Electromagnetic ring; 15. Inner rod; 16. Annular groove; 17. Heating arc sheet; 101. Elastic part; 102. Sponge sheet; 103. Electromagnetic suction block; 18. Auxiliary ring. DETAILED DESCRIPTION

[0034] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figure 1-2A polystyrene colorimetric device is shown, comprising a measuring device body 1, with a light source 2 embedded in the top surface of the measuring device body 1. A sample measuring frame 3 is slidably mounted within the measuring device body 1, positioned directly below the light source 2. A plurality of RGB color sensors 9 are mounted on the inner bottom wall of the sample measuring frame 3. A partition made of a transparent material is mounted on the inner wall of the sample measuring frame 3, positioned above the RGB color sensors 9. A placement slot 8 is centrally located within the partition. Within the placement slot 8, a plurality of sample sheets 4 corresponding to the RGB color sensors 9 are placed, connected by heat insulation sheets 7.

[0037] Figure 2-4 It is shown that a driving motor 6 is installed on one side of the top surface of the partition, and the output end of the driving motor 6 is connected to a lead screw 5, and a threaded sleeve 13 is sleeved on the surface of the lead screw 5, and an electromagnetic ring 14 is sleeved on the outer surface of the threaded sleeve 13, and a plug-in rod 11 is fixedly connected to the surface of the electromagnetic ring 14. A cleaning rod is slidably fitted on the surface of the placement groove 8, and the cleaning rod includes an inner rod 15 and a sponge sleeve 10 sleeved on the outer surface of the inner rod 15. The surface of one end of the inner rod 15 close to the electromagnetic ring 14 is coated with a magnetic coating that attracts the electromagnetic ring 14. The end of the inner rod 15 close to the electromagnetic ring 14 is provided with an annular groove 16 that matches the plug-in rod 11, and the end of the inner rod 15 close to the electromagnetic ring 14 is movably connected to a spring bar 12, and the tail end of the spring bar 12 is fixedly connected to the surface of the electromagnetic ring 14;

[0038] The length of the sponge cover 10 is greater than the length of the placement groove 8, and the surface of the sponge cover 10 is in contact with the top surface of the sample sheet 4. The length of the cleaning rod is less than the cross-sectional length of the partition.

[0039] The light source 2 is a C2 light source, and the cross-sectional area of the light source 2 is not larger than the cross-sectional area of the placement groove 8 . A display is installed on the top surface of the measuring device body 1 , and the display is connected to the RGB color sensor 9 signal.

[0040] Specifically, when measuring the colorimetry of polystyrene using the RGB color sensor 9, three values, L, a, and b, are usually measured, where L represents lightness, a represents red and green, and b represents yellow and blue;

[0041] To ensure the cleanliness of the surface of the sample sheet 4, a wiping operation is usually adopted. However, when the sample sheet 4 retains fingerprints or other marks, a single horizontal wiping operation will result in a poor cleaning effect on the surface of the polystyrene sample sheet 4. Therefore, the present application utilizes the cooperation of the drive motor 6, the lead screw 5 and the electromagnetic ring 14 to achieve longitudinal and transverse cleaning, thereby enhancing the cleaning effect.

[0042] During cleaning, the driving motor 6 is started to indirectly drive the electromagnetic ring 14 and the sponge cover 10 to move laterally along the surface of the lead screw 5. Since the sponge cover 10 is in contact with the surface of the sample sheet 4, a lateral cleaning effect can be achieved during movement (e.g., Figure 5 As shown in FIG. 1 ), during this process, the electromagnetic ring 14 is periodically activated. Under the attraction of the magnetic coating, the inner rod 15 and the sponge cover 10 are driven to approach the electromagnetic ring 14. Then, the electromagnetic ring 14 is closed. Under the action of the spring bar 12, the inner rod 15 and the sponge cover 10 on the surface are driven to vibrate slightly longitudinally on the surface of the sample sheet 4, thereby achieving a longitudinal cleaning effect (as shown in FIG. 1 ). Figure 6 As shown), it can achieve a comprehensive cleaning effect combining horizontal and vertical cleaning;

[0043] During this process, the design of the plug-in rod 11 and the annular groove 16 enables the inner rod 15 to move smoothly when it vibrates and displaces with a small amplitude in the longitudinal direction. At the same time, due to the plug-in connection between the plug-in rod 11 and the annular groove 16, the electromagnetic ring 14 can drive the annular groove 16 to move when it moves, thereby indirectly driving the inner rod 15 and the sponge cover 10 on the surface to move;

[0044] Then the light source 2 is started, and the emitted light passes through the sample sheet 4 and then L, a, and b in the sample sheet 4 are fed back to the display. In this application, the multiple sample sheets 4 in the placement slot 8 are made of polystyrene materials with different chromaticities.

[0045] The depth of the annular groove 16 is greater than the length of the plug-in rod 11 . In the initial state, there is a gap between the surface of the electromagnetic ring 14 and the end of the inner rod 15 where the annular groove 16 is provided.

[0046] Specifically, the size design of the annular groove 16 allows the plug-in rod 11 to maintain a stable plug-in effect with the inner rod 15. At the same time, the existence of the gap in the initial state allows the inner rod 15 to have a certain operating space during subsequent longitudinal shaking.

[0047] Second implementation method:

[0048] Different from the first embodiment, in this embodiment, the multiple sample pieces 4 placed in the groove 8 are made of polystyrene material of the same color, so as to compare the fluctuation influence of the measured values of L, a and b at different temperatures.

[0049] Figure 7 As shown, the sponge cover 10 includes an elastic member 101 centrally arranged at the top end of the inner rod 15, and sponge sheets 102 are connected to both ends of the elastic member 101. The ends of the two sponge sheets 102 close to each other are embedded in electromagnetic suction blocks 103 that attract each other. A heating arc sheet 17 is embedded in the center position of the bottom surface of the inner rod 15, and the heating arc sheet 17 is located above the sample sheet 4.

[0050] Specifically, in this embodiment, the plurality of sample sheets 4 placed in the slot 8 are made of polystyrene material of the same color.

[0051] After cleaning, the electromagnetic suction block 103 is turned off. Under the action of the elastic member 101, the sponge sheet 102 retracts, exposing the heating arc sheet 17 on the surface of the inner rod 15. Since the heating arc sheet 17 is located above the sample sheet 4 and does not directly contact it, when the heating arc sheet 17 moves to different positions of the sample sheet 4, the heating temperature is different (e.g. Figure 9 As shown, for ease of viewing, the auxiliary ring 18 is not shown in the figure), which will cause the sample sheet 4 to soften to varying degrees, affecting the measured values of L, a and b, thereby detecting the effect of different temperatures on the color of polystyrene for control during processing;

[0052] During this process, the design of the heat-insulating sheet 7 can prevent the adjacent sample sheets 4 from being disturbed by heat.

[0053] By comparing the fluctuations and changing trends of L value, a value, and b value at different temperatures, the color change of the product can be determined, and the control range of a value and b value can be set during processing to improve the color stability of the product.

[0054] A displacement sensor is installed inside the electromagnetic ring 14 , and the displacement sensor is connected to the electromagnetic ring 14 for signal communication.

[0055] Specifically, the design of the displacement sensor can monitor the movement position of the electromagnetic ring 14, and then switch the heating temperature of the heating arc piece 17 or provide a reference when the sponge cover 10 moves to a different position of the sample piece 4.

[0056] When the electromagnetic suction block 103 is powered off, the arc length between the tail ends of the two sponge pieces 102 is greater than the arc length of the heating arc piece 17. When the electromagnetic suction block 103 is powered on, the sum of the cross-sectional arc lengths of the two sponge pieces 102 is not less than two-thirds of the overall cross-sectional arc length of the sponge cover 10.

[0057] Specifically, when the two electromagnetic suction blocks 103 attract, the sponge sheet 102 can cover the heating arc sheet 17, thereby facilitating the cleaning operation. Afterwards, when the two electromagnetic suction blocks 103 are powered off, the gap between the two sponge sheets 102 is exposed, which facilitates the exposure of the heating arc sheet 17, thereby softening the sample sheet 4 below.

[0058] Figure 7-8 It is shown that the cross-sectional length of the electromagnetic suction block 103 is smaller than the cross-sectional length of the sponge sheet 102, and the cross-sectional length of the heating arc sheet 17 is smaller than the length of the sponge sheet 102. An auxiliary ring 18 is installed inside the elastic member 101 and is located on the outside of both ends of the heating arc sheet 17. The surface of the auxiliary ring 18 at the lower position is symmetrically provided with magnetic suction areas, and the magnetic suction areas on both sides attract each other with the two electromagnetic suction blocks 103 respectively.

[0059] Specifically, when the two electromagnetic suction blocks 103 need to be re-adsorbed and fixed later, since the distance between the two electromagnetic suction blocks 103 is large after power failure, it is inconvenient to implement direct magnetic suction operation. An auxiliary ring 18 is designed. With the help of the magnetic suction area on the surface of the auxiliary ring 18, the two electromagnetic suction blocks 103 are able to approach the magnetic suction area one step at a time, and then after reaching the magnetic suction area, the distance between the two electromagnetic suction blocks 103 is reduced, and then continue to be adsorbed and moved. The adsorption of the two electromagnetic suction blocks 103 is achieved through gradual adsorption transfer, which drives the closure of the sponge sheet 102.

[0060] A method for using a polystyrene colorimeter comprises the following steps:

[0061] S1. Multiple polystyrene sample sheets 4 to be tested are spliced together using a heat-insulating sheet 7 and then placed in a placement slot 8. The sample measurement frame 3 is then placed in the measurement device body 1.

[0062] S2. Start the drive motor 6 to drive the threaded sleeve 13 and the electromagnetic ring 14 to reciprocate along the surface of the lead screw 5. Under the connection between the plug rod 11 and the inner rod 15, the sponge sleeve 10 is driven to clean the surface of the sample piece 4.

[0063] S3. When cleaning the sample sheet 4, the electromagnetic ring 14 is periodically activated, so that the inner rod 15 and the sponge cover 10 on the surface can move laterally on the surface of the sample sheet 4 while vibrating slightly longitudinally, so that the sponge cover 10 can comprehensively clean the surface of the sample sheet 4 in the transverse and longitudinal directions;

[0064] S4. After cleaning, start the light source 2 and cooperate with the heating arc 17 to detect the changes in the L, a, and b values of the sample 4 under different temperature factors.

[0065] In summary, the present application utilizes the cooperation of the lead screw 5, the electromagnetic ring 14, the inner rod 15 and the sponge sleeve 10 to comprehensively achieve the cleaning effect of the horizontal and vertical directions on the surface of the sample piece 4, thereby ensuring the accuracy of the measurement results. At the same time, the original chromaticity test method is changed to the L, a, and b value test under the C2 light source. By comparing the fluctuations and change trends of the L value, a value, and b value, the color change of the product is determined, and the control range of the a value and b value is set to control the color fluctuation range of the product, thereby improving the stability of the product color and improving the product quality.

[0066] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A polystyrene colorimetric device, comprising a measuring device body (1), characterized in that: A light source (2) is embedded in the top surface of the measuring device body (1), a sample measuring frame (3) located directly below the light source (2) is slidably mounted inside the measuring device body (1), a plurality of RGB color sensors (9) are mounted on the inner bottom wall of the sample measuring frame (3), a partition made of a transparent material located above the RGB color sensor (9) is mounted on the inner wall of the sample measuring frame (3), a placement groove (8) is provided at the center position inside the partition, and a plurality of sample sheets (4) corresponding to the RGB color sensors (9) are placed inside the placement groove (8) and are spliced together by heat insulation sheets (7); A driving motor (6) is installed on one side of the top surface of the partition, and the output end of the driving motor (6) is connected to a lead screw (5), the surface of the lead screw (5) is sleeved with a threaded sleeve (13), the outer surface of the threaded sleeve (13) is sleeved with an electromagnetic ring (14), the surface of the electromagnetic ring (14) is fixedly connected to a plug-in rod (11), and the surface of the placement groove (8) is slidably fitted with a cleaning rod, and the cleaning rod includes an inner rod (15) and a sponge sleeve (10) sleeved on the outer surface of the inner rod (15), the surface of one end of the inner rod (15) close to the electromagnetic ring (14) is coated with a magnetic coating that attracts the electromagnetic ring (14), the end of the inner rod (15) close to the electromagnetic ring (14) is provided with an annular groove (16) matching the plug-in rod (11), the end of the inner rod (15) close to the electromagnetic ring (14) is movably connected to a spring bar (12), and the tail end of the spring bar (12) is fixedly connected to the surface of the electromagnetic ring (14); The length of the sponge sleeve (10) is greater than the length of the placement groove (8), and the surface of the sponge sleeve (10) is in contact with the top surface of the sample sheet (4). The length of the cleaning rod is less than the cross-sectional length of the partition.

2. A polystyrene colorimetric device according to claim 1, characterized in that: The light source (2) is a C2 light source, and the cross-sectional area of the light source (2) is not greater than the cross-sectional area of the placement groove (8).

3. The polystyrene colorimetric device according to claim 1, wherein: The depth of the annular groove (16) is greater than the length of the plug-in rod (11), and in the initial state, there is a gap between the surface of the electromagnetic ring (14) and the end of the inner rod (15) provided with the annular groove (16).

4. The polystyrene colorimetric device according to claim 1, wherein: A displacement sensor is installed inside the electromagnetic ring (14), and the displacement sensor is connected to the electromagnetic ring (14) by signal.

5. The polystyrene colorimetric device according to claim 1, wherein: A display is installed on the top surface of the measuring device body (1), and the display is connected to the RGB color sensor (9) signal.

6. A polystyrene colorimetric device according to claim 1, characterized in that: The sponge sleeve (10) includes an elastic member (101) centrally arranged at the top end of the inner rod (15), and sponge sheets (102) are connected to both ends of the elastic member (101). The ends of the two sponge sheets (102) close to each other are connected with electromagnetic suction blocks (103) that attract each other. A heating arc sheet (17) is connected with the center position of the bottom surface of the inner rod (15), and the heating arc sheet (17) is located above the sample sheet (4).

7. A polystyrene colorimetric device according to claim 6, characterized in that: The cross-sectional length of the electromagnetic suction block (103) is smaller than the cross-sectional length of the sponge sheet (102), and the cross-sectional length of the heating arc sheet (17) is smaller than the length of the sponge sheet (102). An auxiliary ring (18) located outside the two ends of the heating arc sheet (17) is installed inside the elastic member (101), and the surface of the auxiliary ring (18) at the lower position is symmetrically provided with magnetic suction areas, and the magnetic suction areas on both sides attract each other with the two electromagnetic suction blocks (103).

8. The polystyrene colorimetric device according to claim 6, wherein: When the electromagnetic suction block (103) is powered off, the arc length between the tail ends of the two sponge sheets (102) is greater than the arc length of the heating arc sheet (17); when the electromagnetic suction block (103) is powered on, the sum of the cross-sectional arc lengths of the two sponge sheets (102) is not less than two-thirds of the overall cross-sectional arc length of the sponge sleeve (10).

9. A method for using a polystyrene colorimetric device according to any one of claims 1 to 8, characterized in that: The following steps are included: S1. Splice a plurality of polystyrene sample sheets (4) to be tested through a heat-insulating sheet (7), then place them in a placement slot (8), and then place the sample measurement frame (3) into the measurement device body (1); S2, starting the driving motor (6), driving the threaded sleeve (13) and the electromagnetic ring (14) to move back and forth along the surface of the lead screw (5), and driving the sponge sleeve (10) to clean the surface of the sample piece (4) under the connection between the plug rod (11) and the inner rod (15); S3. When cleaning the sample sheet (4), the electromagnetic ring (14) is periodically activated, so that the inner rod (15) and the sponge cover (10) on the surface can move laterally on the surface of the sample sheet (4) and vibrate longitudinally with a small amplitude, so that the sponge cover (10) can perform comprehensive cleaning of the surface of the sample sheet (4) in the transverse and longitudinal directions; S4. After cleaning, start the light source (2) and cooperate with the heating arc (17) to detect the changes in the L, a, and b values of the sample (4) under different temperature factors.

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