Clarity tester

Abstract

The utility model provides a clarity tester. The clarity tester comprises a background switching device, a clockwork spring and background cloth, and the background switching device and the clockwork spring are respectively fixed at the head end and the tail end of the background cloth. The background switching device further comprises a detection window, the detection window is arranged between the background switching device and the clockwork spring, at least part of the area of the background cloth is located in the detection window, and at least part of the area of the background cloth is wound around the background switching device and / or the clockwork spring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a clarity tester. BACKGROUND

[0002] Currently, the instrument used for blue embolization microsphere lamp detection is a clarity tester, which is mainly used for detecting the clarity of various types of injection, large infusion bottle liquid medicine. When detecting, black background and white background are usually used.

[0003] In the detection process, a commonly used color background plate is usually used as a commonly used lamp detection background plate. If the current color background plate cannot accurately judge the content, the detection sample needs to be put down and manually move another color background plate to serve as a detection background plate.

[0004] This detection method is low in efficiency, and when the content to be detected is embolization microspheres, the embolization microspheres in the vial will change from a suspended state to a sedimentation state during the manual switching of different color background plates. When the sample is picked up again, it needs to be shaken to the suspended state before the detection can continue. Utility model content

[0005] The purpose of the present application is to provide a clarity tester to improve detection efficiency.

[0006] The embodiments of the present application are implemented as follows:

[0007] In a first aspect, the embodiments of the present application provide a clarity tester, which comprises a background switching device, a clockwork spring and a background cloth; the background switching device and the clockwork spring are respectively fixed to the first end and the second end of the background cloth.

[0008] It also comprises a detection window, which is arranged between the background switching device and the clockwork spring. The background cloth is at least partially located in the detection window and at least partially wound around the background switching device and / or the clockwork spring.

[0009] In the above technical solution, the sample to be detected can be placed in the detection window for detection, and the sample can be judged to be qualified or not according to the color of the area of the background cloth located in the detection window. Since part of the background cloth is wound around the background switching device and / or the clockwork spring, the background switching device and the clockwork spring can be used to switch different areas of the background cloth to the detection window. The clockwork spring can stretch the background cloth and keep it in a taut state. In the case that the colors of the areas in the background cloth are different, the sample can be detected by using multiple background colors. The clarity tester provided by the above technical solution has a simple background color switching method and can improve the detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0011] Figure 1 The schematic diagram of the clarity tester provided by the embodiments of the present application;

[0012] Figure 2 The internal schematic diagram of the clarity tester provided by the embodiments of the present application;

[0013] Figure 3 The sectional view of the clarity tester provided by the embodiments of the present application;

[0014] Figure 4 The schematic diagram of the first color sub-background cloth set on the clockwork spring;

[0015] Figure 5 The schematic diagram of the third color sub-background cloth set on the background cloth reel.

[0016] Figure: 100-Clarity tester; 101-Lamp adjusting knob; 1011-Lamp; 102-Timer switch; 103-Plus / minus switch; 104-Display screen; 105-Background cloth switching control screen; 106-Stop piece; 107-Background cloth roller; 110-Placing plate; 200-PLC controller; 2001-Probe; 2000-Sensing piece; 2002-Second color sensing piece; 2003-First color sensing piece; 400-Background switching device; 201-Background cloth reel; 202-Reel connector; 203-Servo motor; 204-Turn angle device; 205-Clockwork spring; 206-Clockwork spring fixer; 2011-Turn shaft connector; 300-Background cloth; 301-First color sub-background cloth; 302-Second color sub-background cloth; 303-Third color sub-background cloth; 50-Detection window. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] The following detailed description of embodiments of the application in the drawings provided is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based upon the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of the present application.

[0019] The embodiments of the present application provide a clarity tester 100, which will be described below in combination with the accompanying drawings Figures 1-5 The embodiments of the present application will be described briefly. Specifically, as shown in Figures 1-3 The clarity tester 100 includes a background switching device 400, a clockwork spring 205, a background cloth 300, and a detection window 50. The background switching device 400 and the clockwork spring 205 are fixed at the two ends of the background cloth 300, respectively; that is, the background switching device 400 and the clockwork spring 205 are connected to the two opposite ends of the background cloth 300, respectively. The detection window 50 is arranged between the background switching device 400 and the clockwork spring 205; at least part of the background cloth 300 is located in the detection window 50, and at least part of the background cloth 300 is wound around the background switching device 400 and / or the clockwork spring 205.

[0020] In the embodiments of the present application, when the handheld drug reagent is used for clarity detection, the area where the drug reagent is placed for detection is referred to as a detection window 50, as shown in Figure 1 and Figure 2 The detection window 50 is located on the inner side of the clarity tester box and is a fixed area; please continue to refer to Figure 3 In the detection window 50, the clockwork spring 205 is arranged at one side of the upper end of the detection window 50, the background switching device 400 is arranged at one side of the bottom of the detection window 50, one end of the background cloth 300 is fixed on the clockwork spring 205, and the other end of the background cloth 300 is fixed on the background switching device 400. Thus, part of the background cloth 300 can be displayed between the clockwork spring 205 and the background switching device 400, that is, in the detection window 50.

[0021] In this embodiment, the background switching device 400 rotates clockwise or counterclockwise and, in conjunction with the spring 205, drives the background cloth 300 upward or downward, thereby controlling the display of different areas of the background cloth 300 in the detection window 50, thus achieving the switching of the background cloth 300 corresponding to the detection window 50. It should be noted that when the clarity tester 100 is placed on a flat surface for testing, its bottom is downward relative to its top, and its top is upward relative to its bottom. "Upward drive" is understood as the clarity tester 100 moving from the bottom to the top, and "downward drive" is understood as the clarity tester 100 moving from the top to the bottom. It is easy to understand that when the background switching device 400 drives the background cloth 300 downwards, a portion of the background cloth 300 originally located in the detection window 50 area is wound into the background switching device 400, while the portion of the background cloth 300 wound by the spring 205 is driven downwards and thus displayed in the detection window 50. When the background switching device 400 drives the background cloth 300 upwards, the portion of the background cloth 300 originally located in the detection window 50 area is wound into the spring 205, while the portion of the background cloth 300 wound in the background switching device 400 is driven into the detection window 50. When different areas of the background cloth 300 have different colors, the background color of the detection window 50 can be changed by setting different areas of the background cloth 300 in the detection window 50 to adapt to the background requirements of different drugs and reagents. The operation is simple and convenient, and can improve detection efficiency.

[0022] In some implementations, such as Figure 3 As shown, the spring 205 is located at the upper part of the clarity tester 100, as... Figure 4 As shown, the background cloth 300 is installed on the clarity tester 100 by means of a spring retainer 206, and the spring 205 is used to stretch the background cloth 300; the background switching device 400 is located at the bottom of the clarity tester 100.

[0023] In some implementations, such as Figure 2 and Figure 3As shown, the background switching device 400 comprises a background cloth reel 201, a reel connector 202, a corner changer 204 and a servo motor 203. The background cloth 300 is connected to the background cloth reel 201, and a part of the background cloth 300 can be wound on the background cloth reel 201. By winding the background cloth 300 on the background cloth reel 201, the area of the background cloth 300 originally wound on the clockwork spring 205 can be moved to the detection window 50. The corner changer 204 is drivingly connected to the output end of the servo motor 203, for changing the direction of the rotation axis of the output shaft. The reel connector 202 connects the background cloth reel 201 and the corner changer 204, so that the background cloth reel 201 can be rotated under the action of the servo motor 203. The power output by the servo motor 203 is transmitted to the background cloth reel 201 through the corner changer 204 and the reel connector 202 in sequence. During the forward rotation of the background cloth reel 201, the background cloth 300 is downwardly transmitted, so that the area of the background cloth 300 in the detection window 50 can be wound on the background cloth reel 201, and the area of the background cloth 300 wound on the clockwork spring 205 can be pulled into the detection area under the traction of the background cloth reel 201. At this time, the clockwork spring 205 has a traction force opposite to that of the background cloth reel 201, and the elastic force of the background cloth reel 201 and the clockwork spring 205 generates a traction force opposite to that of the background cloth reel 201, so as to control the background cloth 300 to be unfolded in the detection window 50. During the reverse rotation of the background cloth reel 201, the background cloth 300 wound on the background cloth reel 201 is released, and the elastic force of the clockwork spring 205 pulls the background cloth 300 upwardly, so that the area of the background cloth 300 wound on the background cloth reel 201 can be unwound from the background cloth reel 201 and released, and can be pulled into the detection window 50 under the traction of the elastic force of the clockwork spring 205. The area of the background cloth 300 originally in the detection window 50 can be wound on the clockwork spring 205. When the background cloth reel 201 stops rotating, the background cloth 300 is fixed synchronously. At this time, the clockwork spring 205 also stops rotating.

[0024] In the above embodiment, the power of the servo motor 203 is transmitted to the background cloth reel 201 through the corner changer 204 and the reel connector 202. The process of switching different areas of the background cloth 300 to the detection window 50 can be directly realized by the rotation of the servo motor 203, so that the degree of automation is high and the efficiency is higher. In other embodiments, the axis of the output shaft of the servo motor 203 can be coaxially arranged with the background cloth reel 201, and the background cloth reel 201 is directly connected with the servo motor 203 to drive the background cloth reel 201 to rotate.

[0025] In some embodiments, as Figure 3As shown, the background cloth 300 further comprises at least one probe 2001 arranged below the detection window 50, and the background cloth 300 comprises at least two sub-background cloths of different colors connected with each other, such as Figure 3 As shown, the exemplary sub-background cloths comprise a first color sub-background cloth 301 and a second color sub-background cloth 302; each sub-background cloth of different color is arranged with a corresponding sensing piece 2000, such as Figure 3 As shown, the exemplary sensing piece 2000 comprises a first color sensing piece 2003 and a second color sensing piece 2002, wherein the first color sub-background cloth 301 corresponds to the first color sensing piece 2003, and the second color sub-background cloth 302 corresponds to the second color sensing piece 2002; when the sensing piece 2000 is located at the detection position of the probe 2001, at this time, the detection window 50 fully displays any one color of the sub-background cloth; specifically, when the first color sensing piece 2003 is identified to be located at the detection position of the probe 2001, the first color sub-background cloth 301 is conveyed into the detection window 50; when the second color sensing piece 2002 is identified to be located at the detection position of the probe 2001, the second color sub-background cloth 302 is conveyed into the detection window 50. Thus, through the identification of the probe to the different color sensing pieces 2000, the switching of the different color background cloths 300 in the detection window 50 is controlled, so as to quickly adapt to the demand of the detection sample for different background cloths 300.

[0026] Specifically, in the embodiment of the present application, the probe 2001 is signal connected with the servo motor 203. When the sensing piece 2000 is located at the detection position of the probe 2001, the detection window 50 fully displays any one color of the sub-background cloth. Each complete sub-background cloth only has one color, and a complete sub-background cloth can be larger than the detection window 50, or can be just enough to fill the detection window 50, as long as the color of the background cloth 300 can be used as the background color of the detection window 50 for detection, and the detection window 50 only displays one color of the sub-background cloth.

[0027] As can be understood, in the process of switching the background color of the clarity tester 100 provided in this embodiment, the background cloth reel 201 is driven to rotate by the servo motor 203, and when the sensing piece 2000 arranged on the background cloth 300 corresponding to the sub-background cloth is detected by the probe 2001, there is only one color of the sub-background cloth in the detection window 50, i.e., there is only one background color; at this time, if the servo motor 203 is stopped according to the signal feedback by the probe 2001, the background color of the detection window 50 can be replaced by the color of the sub-background cloth. This way can more accurately control the timing of stopping the servo motor 203 in the process of switching the background color of the detection window 50, so that there is only one background color in the detection window 50.

[0028] In other embodiments, the number of probes 2001 can be two, three, or four, etc., to improve detection accuracy. For example, in an embodiment with two probes 2001, the two probes 2001 are respectively disposed on the left and right sides of the sub-background cloth, that is, on the left and right sides of the detection window 50. Correspondingly, two, three, or four sensors 2000 can also be disposed for each sub-background cloth, or there can be only one horizontally disposed strip-shaped sensor 2000. Furthermore, the sensor 2000 disposed for a sub-background cloth can be disposed below the sub-background cloth, or it can be disposed at the connection position between the sub-background cloth and another sub-background cloth below it, as long as when the sensor 2000 is detected by the probe 2001, there is only the sub-background cloth corresponding to the probe 2001 in the detection window 50.

[0029] In one optional embodiment of this application, at least two sub-background cloths of different colors include a first-color sub-background cloth 301 and a second-color sub-background cloth 302 spliced ​​together from top to bottom along the detection window 50. That is, the background cloth 300 includes a first-color sub-background cloth 301 located at the top and a second-color sub-background cloth 302 located at the bottom, and the color of the first-color sub-background cloth 301 is different from the color of the second-color sub-background cloth 302. Figure 3 As shown, a first color sensor 2003 is provided at the connection between the first color sub-background cloth 301 and the second color sub-background cloth 302, and a second color sensor 2002 is provided on the side of the second color sub-background cloth 302 near the bottom of the detection window 50. Therefore, during the process of switching the background color of the detection window 50, when the probe 2001 located below the detection window 50 detects the first color sensor 2003, the first color sub-background cloth 301 is displayed in the detection window 50. At this time, the probe 2001 sends a signal to stop the servo motor 203, which can prevent the second color sub-background cloth 302 from entering the detection window 50. The detection window 50 is filled with the first color sub-background cloth 301, thereby avoiding the detection window 50 from having two background colors. Similarly, when the probe 2001 detects the second color sensor 2002, the second color sub-background cloth 302 is displayed in the detection window 50, and the background color of the detection window 50 is only the color of the second color sub-background cloth 302.

[0030] In this embodiment, different colored sub-background cloths are identified and controlled by the color sensor 2000 below each sub-background cloth, thereby switching between different colored background cloths 300 in the detection window 50.

[0031] In some embodiments, the background cloth 300 further includes a third color sub-background cloth 303 connected to the second color sub-background cloth 302; that is, the background cloth 300 has three colors, and the color of the third color sub-background cloth 303 is different from that of the first color sub-background cloth 301 and the second color sub-background cloth 302. The third color sub-background cloth 303 is disposed on the side of the second color sub-background cloth 302 away from the first color sub-background cloth 301, such as... Figure 5 As shown, the third color sub-background cloth 303 is connected to the background cloth roll 201 via a pivot connector 2011.

[0032] like Figure 2 and Figure 3 As shown, the second color sensor 2002 is disposed at the connection between the second color sub-background cloth 302 and the third color sub-background cloth 303; the third color sensor 2000 is disposed on the side of the third color sub-background cloth 303 near the bottom of the detection window 50. Similarly, during the process of switching the background color of the detection window 50, when the probe 2001 detects the second color sensor 2002, the servo motor 203 stops rotating, so that the second color sub-background cloth 302 corresponding to the second color sensor 2002 is displayed in the detection window 50; when the probe 2001 detects the third color sensor 2000, the servo motor 203 stops rotating, so that the third color sub-background cloth 303 corresponding to the third color sensor 2000 is displayed in the detection window 50. Figure 3 The current state is that probe 2001 recognizes the second color sensor 2002, and the detection window 50 is displayed by the second color sub-background cloth 302; while the third color sensor 2000 corresponding to the third color sub-background cloth 303 is not displayed. It should be noted that when probe 2001 recognizes the third color sensor 2002, the third color sub-background cloth 303 is displayed in the detection window 50. At this time, the background cloth roll 201 still fixes the background cloth 300. Therefore, there is still a spare background cloth 300 between the third color sensor 2000 and the background cloth roll 201, so that the spare background cloth 300 is rolled on the background cloth roll 201, so that the third color sensor 2000 can be displayed and recognized by probe 2001.

[0033] In the aforementioned embodiment where the background cloth 300 includes a first color sub-background cloth 301, a second color sub-background cloth 302, and a third color sub-background cloth 303, the background color of the clarity tester 100 detection window 50 can be switched among the three colors.

[0034] The embodiments of this application are not limited to the background cloth 300 including two or three different colors of sub-background cloth, but may also include four, five or even more different colors of sub-background cloth; the setting of corresponding color sensors 2000 and the transmission method are similar, and will not be described in detail here.

[0035] Optionally, in some embodiments, the second color background cloth 302 is a black background cloth.

[0036] In some embodiments, as shown in Figures 1-3 Fig. 4, the clarity tester 100 further comprises a sample plate 110 for placing the sample to be detected. The sample plate 110 is located between the background switching device 400 and the clockwork spring 205 in the vertical direction of the plane on which the clarity tester 100 is located, so that the operator can observe the sample placed on the sample plate 110 in combination with the background color. The side of the sample plate 110 close to the background cloth 300 is further provided with a stopper 106, and the side of the stopper 106 away from the sample plate 110 extends upward, so that the stopper 106 can prevent the objects on the sample plate 110 from being brought into the space below the clarity tester 100 (i.e. the space below the sample plate 110) during the movement of the background cloth 300.

[0037] Further, as shown in Figures 1-3 Fig. 4, the clarity tester 100 further comprises a background cloth roller 107 located between the stopper 106 and the background cloth 300. During the up-and-down movement of the background cloth 300 for switching the background color of the detection window 50, the background cloth roller 107 can reduce the friction between the sample plate 110 or the stopper 106 and the background cloth 300, thereby reducing the damage to the background cloth 300. Optionally, the background cloth roller 107 is a cylindrical structure arranged to rotate, and the peripheral surface of the background cloth roller 107 is in contact with the background cloth 300, so that during the movement of the background cloth 300, the background cloth 300 can rotate under the action of friction, thereby further reducing the damage to the background cloth 300.

[0038] In some embodiments, as shown in Figure 1 Fig. 4 and Figure 2 Fig. 5, the clarity tester 100 further comprises a background cloth switching control panel 105, a lamp 1011 signal connected to the background cloth switching control panel 105, a plus-minus switch 103 signal connected to the background cloth switching control panel 105, and a timing switch 102 signal connected to the background cloth switching control panel 105; the background cloth switching control panel 105 is signal connected to the background switching device 400. Specifically, the background cloth switching control panel 105 has a PLC controller 200 signal connected to a servo motor 203, an angle adjuster 204, a roller connector 202, the lamp 1011, the plus-minus switch 103, and the timing switch 102, etc.

[0039] The background cloth switching control panel 105 can rotate the background switching device 400 to wind or unwind the background cloth 300 from the background switching device 400. The background cloth switching control panel 105 can turn on the light tube 1011, and can control the length of time for which the light tube 1011 is turned on according to the signal input of the plus-minus switch 103. The timing switch 102 can send a signal to the background cloth switching control panel 105 to display the countdown.

[0040] Before detection using the clarity tester 100 provided by the above-mentioned embodiments, calibration can be performed. The specific principle includes: the PLC controller 200 controls the servo motor 203 to rotate the background cloth 300 at a slow speed for self-calibration, and cooperates with the probe 2001 to identify the inductor 2000. The probe 2001 is fixed on the lower side of the placement plate 110 of the clarity tester 100. When the probe 2001 identifies the inductor 2000, a sub-background cloth of one color, such as the black background cloth 300, is completely displayed in the detection window 50. At this time, the servo motor 203 is paused, and the self-calibration of the background cloth 300 is completed.

[0041] Before detection using the clarity tester 100 provided by the above-mentioned embodiments, the light tube adjustment knob 101 can be adjusted according to different detection samples, and the illumination meter is used to realize light illumination adjustment. When there are many detection samples / products, the detection time of a single product / sample can be set through the plus-minus switch 103, so that the detection time of all samples is consistent. After setting, the timing switch 102 is started, and the display screen 104 automatically displays the countdown.

[0042] In some embodiments of the present application, the first color sub-background cloth 301, the second color sub-background cloth 302 and the third color sub-background cloth 303 connected in order from top to bottom are gray, black and white respectively.

[0043] The main functions of using gray as the background color are: 1. Reducing visual fatigue: Gray is a neutral color that can provide a soft contrast, which is suitable for long-time observation. In the case of detecting or observing blue microspheres for a long time, a gray background can reduce visual fatigue and make it easier for observers to focus on the details of the microsphere morphology; 2. Reducing reflection and glare: In the case of strong light or complex background, a gray background can effectively reduce the influence of reflection and glare. In such an environment, a gray background can provide a stable visual basis, making the details of the blue microsphere morphology more clearly visible; 3. Detailed observation: If the focus of observation is on the fine structure and surface features of the blue microsphere rather than its color itself, a gray background can provide a neutral background that highlights these details. Gray does not form a strong color contrast with blue, thereby avoiding color interference.

[0044] The main role of using black as the background color is: 1. Increase contrast: the black background can provide high contrast with the blue embolization microspheres, and the blue microspheres under the black background are easier to detect white impurities such as "gel block", "fiber", etc.; 2. Highlight the morphology of the blue embolization microspheres: under the black background, it is easier to observe the morphology of the blue microspheres such as "cohesive ball", "hollow ball", "broken ball", etc.

[0045] The main role of using white as the background color is: 1. Uniform light reflection: the white background can uniformly reflect light, providing a bright and consistent background. This uniform background lighting helps to reduce shadows and dark areas, making the outline and details of the blue embolization microspheres more clearly visible; 2. Increase contrast: the white background can provide high contrast with the blue embolization microspheres, and the blue microspheres under the white background are easier to detect black impurities such as "black spots" or "other dark foreign matter", etc.

[0046] In some embodiments provided by the present application, the second color sub-background cloth 302 is black. Due to design reasons, the first color sub-background cloth 301, the second color sub-background cloth 302 and the third color sub-background cloth 303 are switched back and forth, and the second color sub-background cloth 302 appears more frequently. In addition, the second color sub-background cloth 302 has a high frequency in actual use, so the second color sub-background cloth 302 is set in the middle position. This design can save some time when switching other background cloths 300, thereby improving detection efficiency.

[0047] When the background color of the detection window 50 is the color of the second color sub-background cloth 302, the step of switching the color of the detection window 50 to the color of the third color sub-background cloth 303 includes: selecting the third color sub-background cloth 303 through the background cloth switching control screen 105, at this time the PLC controller 200 controls the servo motor 203 to reverse a certain number of turns, and the third color sub-background cloth 303 is released on the background cloth reel 201 while the third color sub-background cloth 303 enters the detection window 50 under the traction of the recoil force of the clockwork spring 205, realizing that the detection window 50 completely displays the third color sub-background cloth 303.

[0048] When the background color of the detection window 50 is the color of the third color sub-background cloth 303, the step of switching the color of the detection window 50 to the color of the first color sub-background cloth 301 comprises: selecting the first color sub-background cloth 301 by the background cloth switching control screen 105, at this time, the PLC controller 200 controls the servo motor 203 to rotate a certain number of turns, while the third color sub-background cloth 303 is retracted on the background cloth reel 201, the top spring 205 of the clarity tester 100 releases the second color sub-background cloth 302 and the first color sub-background cloth 301 in turn, the background cloth reel 201 retracts the third color sub-background cloth 303 and the second color sub-background cloth 302 in turn, and the lamp detection background cloth 300 is switched to the first color sub-background cloth 301.

[0049] The preferred embodiments of the present application have been described above with the preferred embodiments, but the present application is not limited to the above examples. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A clarity tester, characterized in that, It includes a background switching device, a spring-loaded mechanism, and a background cloth; the background switching device and the spring-loaded mechanism are respectively fixed to the beginning and end of the background cloth; It also includes a detection window, which is disposed between the background switching device and the spring, wherein at least a portion of the background cloth is located within the detection window and at least a portion is wound around the background switching device and / or the spring.

2. The clarity tester according to claim 1, characterized in that, The background switching device includes a background cloth roll, a roll connector, a corner mechanism, and a servo motor; The background cloth is connected to the background cloth roll, and a portion of the background cloth can be wound around the background cloth roll; the corner mechanism is connected to the output end of the servo motor, and the roll connector connects the background cloth roll and the corner mechanism, so that the background cloth roll can rotate under the action of the servo motor.

3. The clarity tester according to claim 2, characterized in that, It also includes at least one probe disposed below the detection window; the background cloth includes at least two sub-background cloths of different colors that are interconnected, and each sub-background cloth of different colors is provided with a corresponding sensor; the probe is signal-connected to the servo motor; The clarity tester is configured such that when the sensor is located at the detection position of the probe, the sub-background cloth of any color is fully displayed in the detection window.

4. The clarity tester according to claim 3, characterized in that, At least two sub-background cloths of different colors include a first color sub-background cloth and a second color sub-background cloth spliced ​​together from top to bottom along the detection window; A first color sensor is provided at the connection between the first color sub-background cloth and the second color sub-background cloth, and a second color sensor is provided on the side of the second color sub-background cloth near the bottom of the detection window.

5. The clarity tester according to claim 4, characterized in that, The background cloth also includes a third color sub-background cloth connected to the second color sub-background cloth, the third color sub-background cloth being disposed on the side of the second color sub-background cloth away from the first color sub-background cloth; The second color sensor is located at the junction of the second color sub-background cloth and the third color sub-background cloth; A third color sensor is provided on the side of the third color sub-background cloth near the bottom of the detection window.

6. The clarity tester according to claim 5, characterized in that, The second color sub-background cloth is a black sub-background cloth.

7. The clarity tester according to claim 1, characterized in that, It also includes a shelf for placing the sample to be tested; in the vertical direction of the plane where the clarity tester is located, the shelf is located between the background switching device and the spring, and a stop is provided on the side of the shelf near the background cloth, and the stop extends upward on the side away from the shelf.

8. The clarity tester according to claim 7, characterized in that, It also includes a background cloth roller, one side of which is located between the stop and the background cloth.

9. The clarity tester according to claim 8, characterized in that, The background cloth roller is a rotatable cylindrical structure, and the circumferential surface of the background cloth roller is in contact with the background cloth.

10. The clarity tester according to claim 1, characterized in that, It also includes a background cloth switching control panel, a light tube connected to the background cloth switching control panel by signal, an add / subtract switch connected to the background cloth switching control panel by signal, and a timer switch connected to the background cloth switching control panel by signal; The background cloth switching control screen is connected to the background switching device. The background cloth switching control screen is configured to allow the background switching device to rotate so that the background cloth can be rolled around the background switching device or rolled away from the background switching device. The background cloth switching control panel is also configured to: enable the lamp tube to be powered on, and control the duration of the lamp tube being powered on according to the signal input of the plus / minus switch; The timer switch is configured to send a signal to the background cloth switching control screen to display a countdown.

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