Test device for testing display degree of test sample with adjustable visual field distance

Abstract

The invention relates to test equipment for testing the display degree of a test sample with an adjustable visual field distance. The test equipment comprises a darkroom experiment cavity defined by a box body and a cover body, a light source, a sample mounting module and an illuminometer are arranged in the box body; an observation assembly for observing the display degree of the to-be-detected sample is rotationally arranged on the box body; a short-distance test mode and a long-distance test mode are arranged in the box body; an adjusting module for adjusting the visual field distance between the sample mounting module and the observation assembly is also arranged in the box body; the test equipment is ingenious in design, provides a short-distance test mode and a long-distance test mode, can meet the requirements of different test standards and test distances, and improves the flexibility and the application range of the test equipment. The visual field distance between the sample installation module and the observation assembly is adjusted through the adjusting module, and the observation conditions of people for the emergency lighting lamp at different distances in actual use can be simulated more truly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display test devices, in particular to a test device for testing display of a sample with adjustable visual distance. BACKGROUND

[0002] In an emergency, such as a fire, clear evacuation instructions are an important factor in ensuring the safe evacuation of personnel. The display of a fire emergency lighting lamp is directly related to whether it can provide sufficient visual guidance for people in darkness or smoke environment, helping people to quickly find a safe exit, so it is crucial to test the display of a fire emergency lighting lamp.

[0003] According to GB 17945-2024 Fire Emergency Lighting and Evacuation Indication System, the following requirements need to be met:

[0004] 5.3.11.2 Requirement: When the indicator light is on, it should be clearly visible at 3m in front of it under environmental conditions with an illuminance of no more than 500lx.

[0005] 5.3.11.3 Requirement: When the display screen is in the display state, the information displayed should be clearly readable within a 22.5° visual angle range at 0.8m in front of it under environmental conditions with an illuminance of no more than 500lx.

[0006] In the prior art, display testing is generally carried out in a closed dark room; first, the ambient light is turned on, the illuminance is tested with a lux meter, then the sample is powered on and normally operated, the distance of 0.8m and 3m from the sample being tested is measured with a tape measure, then the clarity of the indicator light (display information) is observed with the eyes; however, the size of the dark room is generally small, and most of them can only achieve short distance testing within 3m, and cannot achieve long distance testing of 3m-25m, and the fixed visual distance between the sample installation module and the observation point may not reflect the visibility of the emergency lighting lamp at different positions in the actual situation, resulting in that the test result does not conform to the actual situation. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a test device for testing display of a sample with adjustable visual distance, in view of the above-mentioned defects of the prior art.

[0008] The technical scheme adopted by the present application to solve its technical problems is: a test device for testing display of a sample with adjustable visual distance, comprising a box with an open upper end, a cover body for opening or closing the box, a light source arranged on the inner side of one end of the box, a sample mounting module arranged in the box, a light meter arranged on one side of the sample mounting module and capturing the light value in the current test environment, the light source being capable of directly irradiating on the sample to be tested on the sample mounting module and the light meter, an observation assembly arranged on one side wall of the box and used for observing the display of the sample to be tested, a short distance test mode with a short visual distance and a long distance test mode with a long visual distance being arranged in the box, and an adjusting module arranged in the box and used for adjusting the visual distance between the sample mounting module and the observation assembly.

[0009] In the test device, when the sample to be tested is in the short distance test mode, the sample mounting module comprises a sample mounting platform movably connected with the box, and the adjusting assembly comprises a horizontal moving assembly used for moving the sample mounting platform close to or away from the observation assembly.

[0010] In the test device, the adjusting assembly further comprises a first height adjusting assembly used for adjusting the height of the sample mounting platform.

[0011] In the test device, when the sample to be tested is in the long distance test mode, the sample mounting module comprises a sample clamping assembly and a universal adjusting assembly used for adjusting the test angle of the clamping assembly, the adjusting module comprises a reflecting assembly used for extending the visual distance between the sample to be tested on the sample clamping assembly and the observation assembly, and a second height adjusting assembly used for adjusting the height of the reflecting assembly.

[0012] In the test device, the bottom of the box is provided with a sliding channel, the horizontal moving assembly comprises a movable part slidably connected with the sliding channel, guide sliding grooves arranged on the inner side surface of the box and located on both sides of the sliding channel, and a driving assembly used for driving the movable part to move in the length direction of the guide sliding grooves in the sliding channel, and the movable part is fixedly connected with the sample mounting platform through the first height adjusting assembly.

[0013] In the test device, the movable part comprises a sliding part arranged in the sliding channel, a plurality of connecting parts extending from the outer edge of the sliding part towards the guide sliding grooves, and a roller rotatably connected with the connecting part and slidably connected with the guide sliding grooves.

[0014] The test equipment, wherein the driving assembly comprises a movable rack arranged outside the box body and parallel to the guide chute, a gear in transmission connection with the movable rack, and a rotating handle for driving the gear to rotate; one end of the movable rack is fixedly connected with the lower surface of the sliding part through a connecting piece;

[0015] The test equipment, wherein the sliding channel is provided with a first folding plate and a second folding plate at two ends of the sliding part respectively; one end of the first folding plate and one end of the second folding plate are fixedly connected with the front and rear ends of the sliding part respectively; the other end of the first folding plate and the other end of the second folding plate are fixedly connected with the inner walls of the front and rear sides of the sliding channel respectively.

[0016] The test equipment, wherein the reflection assembly comprises two movable plates movably arranged on the inner walls of the opposite sides of the box body; one of the movable plates is provided with a plurality of first reflection blocks in sequence along the length direction thereof, and the other movable plate is provided with a plurality of second reflection blocks corresponding to the first reflection blocks in sequence along the length direction thereof; all the first reflection blocks and all the second reflection blocks cooperate to fold and reflect the visual field route on the sample to be tested multiple times towards the observation assembly; one end of the box body close to the observation assembly is provided with a third reflection block for reflecting the light emitted by the last second reflection block to the observation assembly.

[0017] The test equipment, wherein the observation assembly comprises an observation cylinder; the box body is provided with a movable channel for the one end of the observation cylinder to extend into; the one end of the observation cylinder extending into the movable channel is rotationally connected with the box body through a rotating shaft; when the observation cylinder is horizontally placed, gaps are arranged between the upper and lower inner walls of the movable channel and the upper and lower surfaces of the observation cylinder; the one end of the observation cylinder close to the movable channel is further fixedly provided with a light shielding sleeve for shielding the ambient light outside the box body.

[0018] The test equipment has the advantages that: the test equipment is designed ingeniously, and provides two test modes of short distance test mode and long distance test mode, so as to adapt to the requirements of different test standards and test distances, and increase the flexibility and application range of the test equipment; the test equipment can more truly simulate the observation conditions of the emergency lighting lamp under different distances in actual use by adjusting the visual field distance between the sample installation module and the observation assembly through the adjusting module; the observation assembly is rotationally connected with the box body and cooperates with the adjustability of the visual field distance, so that the tester can accurately control the observation distance, thereby improving the accuracy of the test result and the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the present application will be further described below with reference to the drawings and embodiments; the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings:

[0020] Figure 1 is a structural schematic view of a test device for testing sample display with adjustable field distance according to a preferred embodiment of the present application;

[0021] Figure 2 is Figure 1 is a sectional view of the horizontal moving assembly 14 in the medium-short distance mode

[0022] Figure 3 is Figure 1 is a top view in the

[0023] Figure 4 is Figure 3 is a sectional view of A-A in the

[0024] Figure 5 is Figure 1 is a circuit reflection schematic diagram of the reflection assembly in the long distance test mode. DETAILED DESCRIPTION

[0025] The terms "first", "second", "third", and "fourth" and the like in the description and claims of the present application and the drawings hereto are used for distinguishing between similar objects talking about the embodiments and are not necessarily used to describe a particular sequential order. Also, the terms "comprises", "comprising", "includes", "including" and the like means "including, but not limited to" and indicate the presence of what is mentioned but not excluding other matters from also being present. For example, a process, method, object, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but can include additional steps or elements not expressly listed or inherent to such process, method, object, or apparatus.

[0026] 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 various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a potentially infinite number of embodiments that are possible.

[0027] "Multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A existing alone, A and B existing together, and B existing alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0028] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0030] A preferred embodiment of the present invention provides a test device for the display of test samples with adjustable field of view, such as... Figures 1-5 As shown, the device includes a box 10 with an opening at the top and a cover 20 that can be opened or closed. In one embodiment, the box 10 and the cover 20 are slidably connected, facilitating the installation of the sample to be tested inside the box or the removal of the sample from the box. The box 10 and the cover 20 together form a darkroom experimental chamber. The darkroom experimental chamber formed by the box and the cover can provide a completely dark environment, eliminating external light interference and ensuring the accuracy of the test results. A light source 11 is provided on the inner side of one end of the box 10. In this embodiment, the light source 11 can be an LED lamp with adjustable light intensity, which is available in the prior art. The LED lamp can provide the lighting environment inside the box, and the brightness of the LED lamp is controlled by a DC power source. The position of the light source is fixed, ensuring the consistency of the light source position and helping to eliminate test errors caused by changes in the position of the light source. A sample mounting module is provided inside the box 10, and a photometer 12 is provided on one side of the sample mounting module to capture the light value in the current test environment. The photometer 12 is available in the prior art, and integrating the photometer and the intelligent DC power supply on the device facilitates the control of the test lighting environment. The light source 11 can directly illuminate the sample to be tested on the sample mounting module and the illuminance meter 12; the illuminance meter can record the light intensity on the sample mounting module in real time. An observation component 30 for observing the display intensity of the sample to be tested is rotatably mounted on one side wall of the chamber 10; observation is convenient, and the observation component prevents ambient light outside the chamber from affecting the line of sight. The chamber and the observation component can also be adjusted at any angle, ensuring accurate test data; the chamber 10 has a short-distance test mode with a short field of view and a long-distance test mode with a long field of view; this testing equipment provides two test modes, short-distance and long-distance, to adapt to different test standards and test distance requirements, increasing the flexibility and applicability of the testing equipment. The chamber 10 also has an adjustment module for adjusting the field of view distance between the sample mounting module and the observation component 30.

[0031] This testing equipment adjusts the field of view distance between the sample mounting module and the observation component via an adjustment module, more realistically simulating the observation conditions of emergency lighting at different distances in actual use. By configuring the observation component in conjunction with the rotatable connection to the enclosure and the adjustable field of view distance, testers can precisely control the observation distance, thereby improving the accuracy of test results and testing efficiency.

[0032] This testing equipment meets the testing requirements of various national and industry standards, ensuring product compliance. Its design makes the testing process more standardized, accurate, and scientific, contributing to improved product quality and user confidence.

[0033] Furthermore, when the sample to be tested is in short-distance testing mode, the sample mounting module includes a sample mounting platform 13 movably connected to the housing 10; the adjustment component includes a lateral movement component 14 that moves the sample mounting platform 13 closer to or further away from the observation component 30. The lateral movement component 14 moves the sample mounting platform 13 back and forth, facilitating testing of samples with short distances; the distance adjustment is convenient.

[0034] Furthermore, the adjustment assembly also includes a first height adjustment assembly 15 for adjusting the height of the sample mounting platform 13. In this embodiment, the first height adjustment assembly can adopt a telescopic rod structure as used in the prior art, which will not be described in detail here; the range of movement of the sample mounting platform 13 is further expanded, which can more realistically simulate the observation conditions of people viewing the emergency lighting from different angles in actual use.

[0035] Furthermore, a sliding channel 111 is provided at the bottom of the housing 10; in this embodiment, the sliding channel 111 is elongated, with its two ends facing the front and rear ends of the housing 10 respectively; the lateral movement assembly 14 includes a movable member 141 slidably connected to the sliding channel 111, guide grooves 142 disposed on the inner surface of the housing 10 and located on both sides of the sliding channel 111, and a driving assembly 143 that drives the movable member 141 to move within the sliding channel 111 along the length direction of the two guide grooves 142; the movable member 141 is fixedly connected to the sample mounting platform 13 through a first height adjustment assembly 15; in this embodiment, the driving assembly 143 can be an electric drive structure in the prior art, or a moving mechanism that manually drives the movable member 141 to move laterally.

[0036] Furthermore, the movable component 141 includes a sliding part 1411 disposed in the sliding channel 111, a plurality of connecting parts 1412 extending from the outer edge of the sliding part 1411 toward the two guide grooves 142, and rollers 1413 rotatably connected to the connecting parts 1412 and slidably connected to the guide grooves 142. In one embodiment, the sliding part 1411 is a block structure. When sliding, the plurality of rollers roll simultaneously in the two guide grooves, thereby driving the sliding part to slide linearly in the sliding channel 111. The friction is small and the sliding is smooth.

[0037] In one embodiment, the drive assembly 143 includes a movable rack 1431 disposed on the outside of the housing 10 and parallel to the guide groove 142, a gear 1432 meshing and transmitting with the movable rack 1431, and a rotary handle 1433 for driving the gear 1432 to rotate; one end of the movable rack 1431 is fixedly connected to the lower surface of the sliding part 1411 via a connector 1434. The gear is driven to rotate manually by cranking the rotary handle, and then the movable rack moves back and forth under the transmission force of the meshing gears, thereby achieving the purpose of adjusting the distance between the sample mounting platform and the observation assembly. This method is energy-efficient, cost-effective, and allows for controllable adjustment distance.

[0038] Furthermore, a first folding plate 1435 and a second folding plate 1436 are respectively provided at both ends of the sliding part 1411 within the sliding channel 111; one end of the first folding plate 1435 and one end of the second folding plate 1436 are fixedly connected to the front and rear ends of the sliding part 1411, respectively; the other end of the first folding plate 1435 and the other end of the second folding plate 1436 are fixedly connected to the inner walls of the front and rear sides of the sliding channel 111, respectively; both the first and second folding plates have folded and unfolded states; as the sliding part 144 moves towards the front end, the first folding plate gradually transforms into the folded state, and the second folding plate assembly transforms into the unfolded state; conversely, as the sliding part moves towards the rear end, the first folding plate gradually transforms into the unfolded state, and the second folding plate assembly transforms into the folded state. The first and second folding plates can provide traction force to the sliding part, making the sliding part move more easily; and the two states of folding and unfolding of the first and second folding plates provide a more flexible space adjustment method.

[0039] Furthermore, when the sample to be tested is in a long-distance testing mode, the sample mounting module includes a sample clamping component 16 and a universal adjustment component 17 for adjusting the testing angle of the sample clamping component 16. In one embodiment, the sample mounting module is detachably connected to the housing. The sample clamping component 16 and the universal adjustment component 17 are both located on the side surface of the housing facing the observation component 30. The display surface of the test sample faces the observation component 30. The sample clamping component 16 adopts a telescopic clamping structure commonly used in the prior art, which can firmly fix the sample and prevent the sample from moving or falling off during the test, ensuring the accuracy and repeatability of the test. Moreover, the design of the clamping component can adapt to samples of different shapes and sizes, improving the versatility of the testing equipment. The universal adjustment component 17 is also a common universal ball structure used in the prior art, which can drive the sample to be tested at different angles. The tester can adjust the angle of the sample as needed to simulate various situations in actual use, ensuring the multifacetedness and representativeness of the test results. The adjustment module includes a reflective component 18 that extends the field of view between the sample to be tested and the observation component 30 on the sample clamping assembly 16, and a second height adjustment component 19 that adjusts the height of the reflective component 18. The reflective component extends the field of view between the sample to be tested and the observation component, thus simulating long-distance observation conditions, which is particularly important for evaluating the visibility of emergency lighting at long distances. Optionally, the second height adjustment component 19 can adopt a lifting structure commonly used in the prior art, or it can be a longitudinal groove structure with a connecting sliding member and a sliding connection therewith. Optionally, in the test experiment, small-volume samples can be mounted on the sample clamping assembly, and large-volume samples can be mounted on the sample mounting platform; this device is suitable for various shapes and sizes of samples to be tested, making it highly practical.

[0040] Furthermore, the reflective assembly 18 includes two movable plates 181 respectively movably disposed on the inner walls of opposite sides of the housing 10; in use, the user can adjust the relative position of the two movable plates according to the rotation angle of the observation assembly, and can flexibly adjust the field of view distance to adapt to the needs of different test angles; in this embodiment, both movable plates 181 are elongated; the two ends of the movable plates 181 face the front and rear ends of the housing respectively; one of the movable plates 181 has a plurality of first reflective blocks 182 arranged sequentially along its length, and the other movable plate 181 has a plurality of second reflective blocks 183 arranged sequentially along its length, each corresponding to one of the first reflective blocks 182; in this embodiment, the first reflective blocks 182 and the second reflective blocks 183 are detachably connected to the movable plates 181; optionally, both the first reflective blocks and the second reflective blocks include a locking part that engages with the movable plate, and a reflective part... The device includes a reflector and a universal rotating part that drives the reflector to rotate on the engaging part; the universal rotating part can adjust the reflection angle of the reflector; the reflector has a triangular block structure; through this precisely designed reflector block, light loss can be minimized, and overall optical efficiency can be improved, thereby obtaining a clearer observation effect; the reflective bevel of the first reflector block 182 faces the sample clamping assembly 16 at the front end of the housing; the reflective bevel of the second reflector block 183 faces the observation assembly 30; all the first reflector blocks 182 and all the second reflector blocks 183 cooperate with each other to fold and reflect the field of view on the sample to be tested multiple times towards the observation assembly 30; through multiple folding and reflection, not only can image distortion and light loss caused by excessively long optical paths be reduced, thereby improving imaging quality, but multiple reflections can also more precisely control the path of light, improving the accuracy and repeatability of the test; such as Figure 5As shown, the foremost first reflective block 182 is used to reflect the field of view on the sample to be tested to the foremost second reflective block 183; the foremost second reflective block 183 and the multiple second reflective blocks 183 behind it, the second first reflective block 182 and the multiple first reflective blocks 182 behind it cooperate with each other to fold and reflect the field of view towards the observation component 30; a third reflective block 184 is provided at one end of the housing 10 near the observation component 30 to reflect the light emitted by the last second reflective block 183 to the observation component 30. Alternatively, the shape of the third reflective block 184 is similar to that of the first and second reflective blocks, with its reflective slope facing the plane where the second reflective block is located. To facilitate the calculation of the total field of view distance between the sample clamping assembly and the observation assembly, a laser that emits light towards the foremost first reflective block can be added to the sample clamping assembly. In this case, the linear distance between the sample clamping assembly and the reflective surface of the foremost first reflective block is L1; the linear distance between the reflective surface of the foremost first reflective block and the reflective surface of the foremost second reflective block is L2; ​​the linear distance between the reflective surface of the foremost second reflective block and the reflective surface of the second first reflective block is L3; and the linear distance between the reflective surface of the second first reflective block and the second second reflective block is L4. The distance is L2; ​​the straight-line distance between the second reflective block and the third reflective block is L3; this folding and reflection continues until the straight-line distance between the second and third reflective blocks is L4, and the straight-line distance between the third reflective block and the observation component is Le; thus, the total field of view distance between the sample and the observation component is calculated as L_total = L1 + nL2 + nL3 + L4 + Le, where n is the number of reflective blocks on one side. Through the above multiple folding and reflection, the field of view distance between the sample and the observation component can be significantly increased in a limited space. This is very beneficial for application scenarios that require long-distance testing, providing users with more convenience and flexibility.

[0041] like Figure 4As shown, the observation assembly 30 includes an observation cylinder 31 rotatably connected to the housing. In this embodiment, the observation cylinder 31 can adopt a telescopic structure, allowing users to adjust the length of the observation cylinder as needed to adapt to different observation distances, thus improving the flexibility and adaptability of use. The housing 10 has an adjustable channel 112 for one end of the observation cylinder 31 to extend into. Installation is convenient; users can easily rotate and adjust the position of the observation cylinder using the end of the observation cylinder extending into the adjustable channel as a fulcrum, without the need for complex mechanical adjustments. The end of the observation cylinder 31 extending into the adjustable channel 112 is rotatably connected to the housing 10 via a pivot, resulting in a simple structure. When the observation cylinder 31 is placed horizontally, gaps are provided between the upper and lower inner walls of the adjustable channel 112 and the upper and lower surfaces of the observation cylinder 31, allowing the observation cylinder to... Each component has a certain rotational space when rotating downwards; in one embodiment, the observation component can rotate 22.5° upwards or downwards from a horizontal position; a light-shielding sleeve 32 is also fixedly fitted on the end of the observation tube 31 near the active channel 112 to shield the ambient light outside the housing 10; the design of the light-shielding sleeve allows the device to be used in various environments, including environments with strong light, without affecting the observation results; the light-shielding sleeve can not only effectively block the interference of external ambient light on the observation, ensuring the stability and consistency of light during the observation process, thereby improving the accuracy of the observation and image quality, but also protect against dust and other external factors from entering the housing from the active channel 112 and affecting the field of view; the overall design takes into account the user's ease of operation, making the user more convenient and comfortable during use.

[0042] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A testing device for the display of a test sample with an adjustable field of view, characterized in that, The device includes a box with an open top and a cover that allows the box to be opened or closed; the box and the cover together form a darkroom experimental chamber; a light source is provided on the inner side of one end of the box; a sample mounting module is installed inside the box, and a photometer is located on one side of the sample mounting module to capture the light intensity in the current testing environment; the light source can directly illuminate the sample to be tested on the sample mounting module and the photometer; an observation component for observing the intensity of the sample to be tested is rotatably mounted on one side wall of the box; the box has a short-distance testing mode with a short field of view and a long-distance testing mode with a long field of view; the box also has an adjustment module for adjusting the field of view distance between the sample mounting module and the observation component.

2. The testing equipment according to claim 1, characterized in that, When the sample to be tested is in short-distance testing mode, the sample mounting module includes a sample mounting platform that is movably connected to the housing; the adjustment component includes a lateral movement component that moves the sample mounting platform closer to or further away from the observation component.

3. The testing equipment according to claim 2, characterized in that, The adjustment assembly also includes a first height adjustment assembly for adjusting the height of the sample mounting platform.

4. The testing equipment according to any one of claims 1-3, characterized in that, When the sample to be tested is in long-distance testing mode, the sample mounting module further includes a sample clamping component and a universal adjustment component for adjusting the testing angle of the clamping component; the adjustment module further includes a reflective component for extending the field of view between the sample to be tested and the observation component on the sample clamping component, and a second height adjustment component for adjusting the height of the reflective component.

5. The testing equipment according to claim 3, characterized in that, The bottom of the box is provided with a sliding channel; the transverse component includes a movable part that is slidably connected to the sliding channel, guide grooves disposed on the inner surface of the box and located on both sides of the sliding channel, and a driving component that drives the movable part to move in the sliding channel along the length direction of the two guide grooves; the movable part is fixedly connected to the sample mounting platform through the first height adjustment component.

6. The testing equipment according to claim 5, characterized in that, The movable component includes a sliding part disposed in the sliding channel, a plurality of connecting parts extending from the outer edge of the sliding part toward the two guide grooves, and a roller rotatably connected to the connecting parts and slidably connected to the guide grooves.

7. The testing equipment according to claim 6, characterized in that, The drive assembly includes a movable rack disposed on the outside of the housing and parallel to the guide groove, a gear meshing and driving the movable rack, and a rotary handle for driving the gear to rotate; one end of the movable rack is fixedly connected to the lower surface of the sliding part through a connector.

8. The testing equipment according to claim 6, characterized in that, The sliding channel is provided with a first folding plate and a second folding plate at both ends of the sliding part; one end of the first folding plate and one end of the second folding plate are fixedly connected to the front and rear ends of the sliding part, respectively; the other end of the first folding plate and the other end of the second folding plate are fixedly connected to the inner walls of the front and rear sides of the sliding channel, respectively.

9. The testing equipment according to claim 4, characterized in that, The reflective assembly includes two movable plates respectively movably disposed on the inner walls of opposite sides of the housing; one movable plate has a plurality of first reflective blocks arranged sequentially along its length, and the other movable plate has a plurality of second reflective blocks arranged sequentially along its length, each corresponding to one of the first reflective blocks; all the first reflective blocks and all the second reflective blocks cooperate with each other to fold and reflect the field of view on the sample under test multiple times toward the observation assembly; a third reflective block is provided at one end of the housing near the observation assembly to reflect the light emitted by the last second reflective block to the observation assembly.

10. The testing equipment according to claim 1, characterized in that, The observation assembly includes a retractable and adjustable observation tube; the housing has an active channel for one end of the observation tube to extend into; the end of the observation tube extending into the active channel is rotatably connected to the housing via a pivot; when the observation tube is placed horizontally, there are gaps between the upper and lower inner walls of the active channel and the upper and lower surfaces of the observation tube; the end of the observation tube near the active channel is also fixedly fitted with a light-shielding sleeve to block ambient light from outside the housing.

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