A device and method for rapid testing of detergent detergency

Abstract

The application discloses a kind of detergent decontamination power quick test device and method, it is related to detergent cleaning test technical field.In the application: including stain box, washing test box, displacement component, lifter, lifting plate and test rod with test ring groove and smooth ring surface.Wherein, stain box contains multiple independent stain cavities, configure distance probe and filling tube.Washing test box is equipped with flow cavity, shunt channel and ultrasonic vibrator.Displacement component includes guide rod, linear motor, travel switch.The application method is attached to different stains by test rod simultaneously, after being washed by washing liquid flow and ultrasonic vibration under unified condition, the decontamination effect is evaluated by detecting stain residue.The application realizes the synchronous test of multiple stains, reduces manual operation and batch deviation, stabilizes control washing parameter, improves test efficiency, repeatability and result reliability.

Description

Technical Field

[0001] This invention relates to the field of detergent cleaning test technology, and in particular to a rapid testing device and method for detergent detergency. Background Technology

[0002] In the research, development, production, and quality testing of detergent products, the testing of detergent detergency is a crucial step, and the results directly affect product formulation optimization, performance evaluation, and market competitiveness.

[0003] Currently, existing methods for testing the detergency of detergents have the following problems:

[0004] First, the testing process relies heavily on manual operation, such as manually applying stains and controlling washing conditions. This is not only cumbersome and time-consuming, but also prone to poor repeatability and low accuracy of test results due to differences in human operation.

[0005] Secondly, it is difficult to conduct simultaneous testing on multiple different types of stains. If it is necessary to compare the stain removal effect under different stains, it is often necessary to conduct tests in batches, which is inefficient. Furthermore, the environmental conditions (such as temperature and washing time) between different batches are prone to deviation, affecting the accuracy of the comparison.

[0006] Third, during the washing test, parameters such as the flow state of the washing liquid and mechanical forces (such as vibration and agitation) are difficult to control stably, resulting in inconsistent washing intensity under the same test conditions, which further reduces the reliability of the test results.

[0007] In summary, how to achieve simultaneous cleaning effect testing of various stains under the same detergent parameters, and improve testing efficiency, accuracy, and stability of results, has become a technical problem that needs to be solved in the field of detergent detergency testing. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0009] This invention provides a rapid testing device for detergent detergency, including a stain box and a washing test box. The stain box has multiple independent stain chambers, each of which pre-stores different types of stain sources. Each stain chamber is equipped with a distance probe for detecting the height of the stain storage, and each stain chamber is independently connected to a filling tube for injecting liquid stains at its bottom.

[0010] The washing test chamber features a flow cavity with multiple parallel flow dividers forming multiple flow channels. Each flow channel has an ultrasonic vibrator embedded in its base plate. The washing test chamber is also connected to a washing liquid supply pipe and a turbid liquid drainage pipe, both communicating with the flow cavity. A displacement assembly is positioned above the stain box and the washing test chamber. A lifting device is connected to the lower side of the displacement assembly, and a lifting plate is fixedly connected to the lower end of the lifting shaft of the lifting device. Multiple test rods are fixedly connected to the bottom of the lifting plate. Multiple test ring grooves are formed on the side of the test rod rings. The side of the test rod rings outside the test ring grooves is a smooth surface, while the inner wall of the test ring grooves is a rough surface.

[0011] As a preferred embodiment of the testing device of the present invention: the top plate of the stain box has a slot directly opposite the stain cavity, and a cleaning part is provided around the inner circumference of the slot, which is in contact with a smooth annular surface. The cleaning part is made of rubber ring, and both the upper and lower edges of the cleaning part are chamfered. A fixing part is provided at the top of the test rod. The width of the fixing part is smaller than the inner diameter of the cleaning part, and the fixing part is fixedly connected to the bottom surface of the lifting plate.

[0012] As a preferred technical solution of the testing device of the present invention: the width of each diversion channel is the same, and the top of the diversion plate is flush with the top of the washing test box.

[0013] As a preferred technical solution of the testing device of the present invention: the side of the lifting plate is provided with multiple label slots, and each label slot is independently aligned with a test rod.

[0014] As a preferred technical solution of the testing device of the present invention: the inner diameter of the test ring groove of the test rod decreases from bottom to top, and the vertical width of the test ring groove of the test rod increases from bottom to top. That is, the higher the position of the test ring groove, the greater its horizontal groove depth and the greater its vertical opening width.

[0015] As a preferred embodiment of the testing device of the present invention: the displacement component includes a guide rod, a linear motor disposed on the guide rod, a first limit switch for limiting the movement range of the linear motor, and a second limit switch. When the linear motor moves and triggers the first limit switch, multiple test rods on the lower side of the lifting plate reach directly above the stain box. When the linear motor moves and triggers the second limit switch, multiple test rods on the lower side of the lifting plate reach directly above the washing test box.

[0016] As a preferred embodiment of the testing device of the present invention: when the test rod is fully inserted into the stain chamber, the level of the stain source liquid in the stain chamber is higher than the test ring groove on the top side of the test rod. When the test rod is fully inserted into the diversion channel, the level of the washing liquid in the flow chamber is higher than the test ring groove on the top side of the test rod.

[0017] As a preferred technical solution of the testing device of the present invention: the upstream of the washing liquid supply pipe is connected to the washing liquid supply tank and is equipped with a supply pump. The supply pump supplies washing liquid toward the flow chamber. The downstream of the turbid liquid discharge pipe is connected to the waste liquid collection tank and is equipped with an external discharge pump. The external discharge pump extracts the oily liquid in the flow chamber.

[0018] This invention provides a rapid testing method for the detergency of detergents, comprising the following:

[0019] Step 1: The displacement component drives the lifting device and lifting plate to move, so that multiple test rods on the lower side of the lifting plate accurately reach the top of the stain box.

[0020] Step 2: The lifting device drives the lifting plate to descend, so that the test rod is fully inserted into the corresponding stain chamber of the stain box, and the stain source pre-stored in the stain chamber is attached to the test ring groove of the test rod.

[0021] Step 3: After the preset stain adhesion time has passed through the test ring groove of the test rod, the lifting device drives the lifting plate to rise, causing the test rod to be gradually pulled out of the stain chamber.

[0022] Step 4: After the test rod is fully withdrawn, the distance probe of the stain box detects the liquid level of the stain source in the corresponding stain chamber. If the detected liquid level is lower than the preset value, liquid stain source is injected into the stain chamber through the filling tube to facilitate repeated testing.

[0023] Step 5: The displacement component moves the lifting device and lifting plate again, so that the test rod carrying the stains reaches directly above the washing test box.

[0024] Step 6: The lifting device drives the lifting plate to descend, so that the test rod is fully inserted into the corresponding diversion channel inside the washing test box.

[0025] Step 7: The washing liquid supply pipe continuously supplies washing liquid to the flow chamber of the washing test box. The washing liquid flows evenly into each diversion channel and is finally discharged from the turbid liquid drain pipe. At the same time, the ultrasonic vibrator of the bottom plate of the diversion channel is activated to enhance the interaction efficiency between the washing liquid and the stains on the test rod.

[0026] Step 8: After supplying washing liquid according to the preset washing time, the washing liquid supply pipe stops supplying, the lifting device drives the lifting plate to rise, and drives the test rod to be pulled out from the diversion channel.

[0027] Step 9: Using testing instruments or manual methods, check the residue of stains in the different test ring grooves on each test rod to evaluate the detergent's cleaning effect on different stains and complete a single test process.

[0028] Compared with existing technologies, the beneficial effects of this invention are:

[0029] 1. The device of the present invention pre-stores different types of stains (such as oil stains, juice stains, mud stains, etc.) in multiple independent stain chambers of the stain box, and simultaneously attaches stains with multiple test rods. Combined with the diversion channel of the washing test box, it realizes synchronous washing under the same conditions, which solves the problems of low efficiency and large batch environmental deviation in traditional batch testing. It can simultaneously complete the comparison of the stain removal effect of multiple stains, significantly improving the testing efficiency.

[0030] 2. This invention utilizes displacement components (linear motor, limit switch) to achieve precise positioning of the test rod between the stain box and the washing test box, and uses a lifting device to automatically insert / extract the test rod. In conjunction with the cleaning unit, excess stains are scraped off, reducing manual operation (such as manual application, controlling washing conditions) throughout the process, reducing result deviations caused by human operation differences, and improving test repeatability and data accuracy.

[0031] 3. In this invention, the width of the diversion channels of the washing test box is consistent, ensuring that the flow state of the washing liquid in each channel is uniform. In addition, the ultrasonic vibrator is started synchronously, which stabilizes and enhances the efficiency of the interaction between the washing liquid and the stains, simulating the mechanical washing effect. This solves the problem that parameters such as the flow of washing liquid and mechanical force are difficult to control stably in traditional tests, ensuring the consistency of washing intensity under the same test conditions and improving the reliability of the reference results. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure when the test rod is inserted into the stain box in this invention.

[0033] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0034] Figure 3 for Figure 2 A schematic diagram of the structure of the stain box.

[0035] Figure 4 This is a schematic diagram showing the results when the test rod and the washing test box are used together in this invention.

[0036] Figure 5 This is a schematic diagram of the flow and coordination of the washing liquid in the washing test box of the present invention.

[0037] Figure 6 This is a schematic diagram of the test rod in this invention.

[0038] The components are: 1-Stain box, 101-Stain chamber, 102-Slot, 103-Cleaning section, 104-Distance probe, 105-Addition tube; 2-Lifting plate, 201-Label slot; 3-Test rod, 301-Test ring groove, 302-Smooth ring surface, 303-Rough ring surface, 304-Fixing section; 4-Guide rod; 5-Linear motor; 6-Lifter, 601-Lifting shaft; 7-First limit switch; 8-Second limit switch; 9-Washing test box, 901-Flow chamber, 902-Diverter plate, 903-Diverter channel, 904-Ultrasonic vibrator; 10-Washing liquid supply pipe; 11-Supply pump; 12-Turbid liquid drain pipe; 13-External drain pump. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0040] Example 1: This invention designs a rapid testing device for the detergency of detergents, such as... Figure 1 , Figure 4 This device mainly consists of a stain box 1, a washing test box 9, a displacement component, a lifting device 6, a lifting plate 2, a test rod 3, and supporting piping components. It can realize the simultaneous adhesion of various stains, washing under uniform conditions, and detection of stain removal effect, greatly improving testing efficiency and accuracy. The specific structural configuration is as follows:

[0041] like Figure 1 , Figure 3 , Figure 5 , Figure 6 Stain Box 1: Contains multiple independent stain chambers 101, each pre-stores different types of liquid stains (such as oil stains, juice stains, mud stains, etc.), allowing for simultaneous testing and comparison of multiple stains. The top of each stain chamber 101 corresponds to a slot 102 on the top plate of Stain Box 1. The slot 102 has a cleaning section 103 (using a rubber ring with chamfered edges) around its inner circumference, used to scrape away excess stains from the smooth annular surface 302 of the test rod 3. Each stain chamber 101 has a filling tube 105 connected to its bottom and a distance probe 104 at its top. The distance probe 104 detects the liquid level of the stain source; when the liquid level falls below a preset value, the filling tube 105 automatically replenishes the stain source, ensuring the continuity of multiple tests.

[0042] like Figure 1 , Figure 5The washing test box 9 has an internal flow chamber 901, within which multiple flow channels 903 are divided by parallel flow dividers 902 (each flow channel 903 has the same width, and the top of the flow dividers 902 is flush with the top of the washing test box 9), ensuring consistent flow of the washing liquid in each channel. Each flow channel 903 has an ultrasonic vibrator 904 embedded in its base plate, which enhances the interaction efficiency between the washing liquid and stains upon activation, simulating mechanical washing effects. The washing test box 9 is connected to a washing liquid supply pipe 10 (upstream to a washing liquid supply tank and supply pump 11) and a turbid liquid discharge pipe 12 (downstream to a waste liquid collection tank and external discharge pump 13), enabling continuous supply of washing liquid and discharge of waste liquid.

[0043] like Figure 1 , Figure 4 The displacement assembly includes a guide rod 4, a linear motor 5, a first limit switch 7, and a second limit switch 8. The linear motor 5 moves along the guide rod 4. When the first limit switch 7 is triggered, the test rod 3 reaches directly above the stain box 1. When the second limit switch 8 is triggered, the test rod 3 reaches directly above the washing test box 9, achieving precise positioning.

[0044] like Figure 1 , Figure 4 Lifter 6: Lifter 6 is connected to lifting plate 2 via lifting shaft 601, which can drive lifting plate 2 to move up and down, realizing the insertion / extraction of test rods 3. Multiple test rods 3 are fixed on the bottom side of lifting plate 2, and label slots 201 are provided on the side (each label slot 201 is aligned with one test rod 3), which can mark the stain type of the corresponding test rod 3 to avoid confusion.

[0045] like Figure 2 , Figure 3 , Figure 6 Test rod 3: Multiple test ring grooves 301 are formed on its annular side (for stain adhesion). The non-test ring groove area is a smooth annular surface 302 (for easy cleaning of excess stains). The inner wall of the test ring grooves 301 is a rough annular surface 303 (to enhance stain adhesion stability). Before the test rod 3 is inserted into the stain cavity 101, the volume of the stain cavity above the stain source liquid level is V0, the volume of the test rod 3 from its bottom to its top test ring groove 301 is V1, and the volume of the test rod 3 when fully inserted into the stain cavity 101 is V2. Therefore, V2>=V0>=V1.

[0046] The test ring groove 301 has the following dimensional characteristics: the inner diameter decreases from bottom to top, and the vertical width increases from bottom to top (the higher the position of the ring groove, the greater the horizontal groove depth and the wider the vertical opening), which can simulate stain adhesion scenarios of different thicknesses / areas. In addition, a fixing part 304 (the width is smaller than the inner diameter of the cleaning part 103) is provided at the top for fixed connection with the lifting plate 2, ensuring that the test rod 3 is not blocked by the cleaning part 103 when it is raised and lowered vertically.

[0047] Example 2: This invention designs a rapid testing method for the detergency of detergents. Through automated mechanical operation, it achieves simultaneous adhesion of various stains, uniform washing conditions, and detergency effect testing. The specific steps are as follows:

[0048] Step 1: Position the test rod directly above the stain box.

[0049] The linear motor 5 moves on the guide rod 4, driving the lifter 6 and the lifting plate 2 to move laterally. The linear motor 5 moves along the guide rod 4 towards the first limit switch 7. When the linear motor 5 triggers the first limit switch 7, the multiple test rods 3 on the lower side of the lifting plate 2 are precisely aligned with the multiple stain chambers 101 of the stain box 1, completing the positioning.

[0050] Step 2: The test rod is inserted into the stain chamber and becomes covered with stains:

[0051] The lifting device 6 drives the lifting plate 2 to descend via the lifting shaft 601, so that each test rod 3 is fully inserted into the corresponding stain chamber 101. At this time, the liquid stain source (such as oil stain, juice stain, etc.) pre-stored in the stain chamber 101 is attached to each test ring groove 301 because the inner wall of the test ring groove 301 is a rough annular surface 303, and the liquid level of the stain source in the stain chamber 101 is higher than the test ring groove 301 on the top side of the test rod 3.

[0052] Step 3: Removing the test rod and cleaning excess dirt:

[0053] After maintaining the preset stain adhesion time (e.g., several seconds), the lifting device 6 drives the lifting plate 2 to rise slowly, causing the test rod 3 to be gradually pulled out of the stain chamber 101. During this process, the cleaning part 103 (rubber ring with a chamfered structure) in the slot 102 of the top plate of the stain box 1 contacts the smooth ring surface 302 of the test rod 3, scraping off the excess stains attached to the smooth ring surface 302, leaving only the target stains in the test ring groove 301 (to avoid excess stains interfering with subsequent washing tests).

[0054] Step 4: Stain Source Liquid Level Detection and Replenishment:

[0055] After the test rod 3 is completely withdrawn from the stain chamber 101, the distance probe 104 configured in each stain chamber 101 detects the liquid level of the stain source in the chamber in real time. If the detected liquid level is lower than the preset value (i.e., the stain source is insufficient), liquid stain source is injected into the chamber through the filling tube 105 at the bottom of the stain chamber 101 to ensure the continuity of subsequent repeated tests.

[0056] Step 5: Position the test rod directly above the washing test box.

[0057] The linear motor 5 drives the lifting device 6 and the lifting plate 2 to move laterally again. The linear motor 5 moves along the guide rod 4 towards the second limit switch 8. When the linear motor 5 triggers the second limit switch 8, the multiple test rods 3 carrying stains accurately reach the multiple diversion channels 903 of the washing test box 9 and complete the positioning.

[0058] Step Six: Inserting the test rod into the shunt channel:

[0059] The lifting device 6 drives the lifting plate 2 to descend again, so that each test rod 3 is fully inserted into the corresponding diversion channel 903 in the washing test box 9 (the diversion channels 903 have the same width to ensure that the washing conditions of each channel are consistent). At this time, the liquid level of the washing liquid in the flow chamber 901 is higher than the test ring groove 301 on the top side of the test rod 3, ensuring that all test ring grooves 301 with attached stains can be soaked in the washing liquid.

[0060] Step 7: Washing solution supply and ultrasonic-assisted washing:

[0061] Driven by the supply pump 11, the washing liquid supply pipe 10 continuously supplies washing liquid solution to the flow chamber 901 of the washing test box 9.

[0062] After the washing liquid enters the flow chamber 901, it flows evenly into each distribution channel 903 through the parallel distribution plates 902, and is finally discharged from the turbid liquid drain pipe 12 (with the external drainage pump 13 assisting in the discharge of waste liquid). At the same time, the ultrasonic vibrator 904 on the bottom plate of each distribution channel 903 is activated synchronously, which enhances the contact efficiency between the washing liquid and the stains on the test rod 3 through vibration, simulating the effect of mechanical washing.

[0063] Step 8: Stop washing and remove the test rod:

[0064] After continuously supplying washing liquid according to the preset washing time (e.g., 2 minutes), the washing liquid supply pipe 10 stops supplying, and the external drainage pump 13 continues to run until the waste liquid in the diversion channel 903 is basically discharged. Subsequently, the lifting device 6 drives the lifting plate 2 to rise, causing the test rod 3 to be completely pulled out of the diversion channel 903.

[0065] Step Nine: Stain Residue Detection and Stain Removal Effectiveness Evaluation

[0066] The residual stains in the different test ring grooves 301 on each test rod 3 are checked by testing instruments (such as a spectrometer) or by manual observation.

[0067] Because the inner diameter of the test ring groove 301 decreases from bottom to top and the vertical width increases (i.e., the horizontal groove depth of the upper ring groove is greater and the vertical opening is wider), the detergent's ability to remove stains with different attachment forms can be evaluated by comparing the residual amount (such as residual area and concentration) of the ring groove at different positions.

[0068] The above method describes a single test operation. To obtain accurate and referable test data, the above method can be repeated multiple times to obtain test results with reference value.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid testing device for the detergency of detergents, characterized in that: Includes a stain box (1) and a washing test box (9). The stain box (1) is provided with multiple independent stain chambers (101). Each stain chamber (101) is equipped with a distance probe (104) for detecting the height of the stain. Each stain chamber (101) is independently connected to a filling tube (105) for injecting liquid stains at the bottom. The washing test box (9) is provided with a flow chamber (901), and multiple flow dividers (902) are distributed in parallel in the flow chamber (901) to form multiple flow dividers (903). Each flow divider (903) has an ultrasonic vibrator (904) embedded in its bottom plate. The washing test box (9) is also connected to a washing liquid supply pipe (10) and a turbid liquid drain pipe (12) that are connected to the flow chamber (901). A displacement assembly is provided above the stain box (1) and the washing test box (9). The lower side of the displacement assembly is connected to the lifter (6). The lower end of the lifting shaft (601) of the lifter (6) is fixedly connected to the lifting plate (2). Multiple test rods (3) are fixedly connected to the bottom side of the lifting plate (2). The test rod (3) has multiple test ring grooves (301) on its ring side. The test rod (3) ring side that is not in the test ring groove (301) is a smooth ring surface (302), and the inner wall of the test ring groove (301) is a rough ring surface (303).

2. The detergent detergency rapid testing device according to claim 1, characterized in that: The top plate of the stain box (1) has a slot (102) facing the stain cavity (101). The inner circumference of the slot (102) is provided with a cleaning part (103) that contacts the smooth ring surface (302). The cleaning part (103) is made of rubber ring, and the upper and lower edges of the cleaning part (103) are provided with chamfered structures. The test rod (3) is provided with a fixing part (304) at the top. The width of the fixing part (304) is smaller than the inner diameter of the cleaning part (103). The fixing part (304) is fixedly connected to the bottom surface of the lifting plate (2).

3. The detergent detergency rapid testing device according to claim 1, characterized in that: Each diversion channel (903) has the same width, and the top of the diversion plate (902) is flush with the top of the washing test box (9).

4. The detergent detergency rapid testing device according to claim 1, characterized in that: The lifting plate (2) has multiple label slots (201) on its side, and each label slot (201) is independently aligned with a test rod (3).

5. The detergent detergency rapid testing device according to claim 1, characterized in that: The inner diameter of the test ring groove (301) of the test rod (3) decreases from bottom to top, and the vertical width of the test ring groove (301) of the test rod (3) increases from bottom to top.

6. The detergent detergency rapid testing device according to claim 1, characterized in that: The displacement assembly includes a guide rod (4), a linear motor (5) disposed on the guide rod (4), a first limit switch (7) for limiting the movement range of the linear motor (5), and a second limit switch (8); When the linear motor (5) moves and triggers the first limit switch (7), the multiple test rods (3) on the lower side of the lifting plate (2) reach directly above the stain box (1); When the linear motor (5) moves and triggers the second limit switch (8), multiple test rods (3) on the lower side of the lifting plate (2) reach directly above the washing test box (9).

7. The detergent detergency rapid testing device according to claim 1, characterized in that: When the test rod (3) is fully inserted into the stain chamber (101), the level of the stain source liquid in the stain chamber (101) is higher than the test ring groove (301) on the top side of the test rod (3). When the test rod (3) is fully inserted into the diversion channel (903), the liquid level of the washing liquid in the flow chamber (901) is higher than the test ring groove (301) on the top side of the test rod (3).

8. The detergent detergency rapid testing device according to claim 1, characterized in that: The upstream of the washing liquid supply pipe (10) is connected to the washing liquid supply tank and equipped with a supply pump (11), and the downstream of the turbid liquid discharge pipe (12) is connected to the waste liquid collection tank and equipped with an external discharge pump (13).

9. A method of using the detergent detergency rapid testing device according to claim 1, characterized in that, Includes the following steps: S1. The displacement component drives the lifter (6) and the lifting plate (2) to move, so that the multiple test rods (3) on the lower side of the lifting plate (2) reach directly above the stain box (1); S2. The lifting device (6) drives the lifting plate (2) to descend, so that the test rod (3) is fully inserted into the corresponding stain cavity (101) of the stain box (1), so that the stain source pre-stored in the stain cavity (101) is attached to the test ring groove (301) of the test rod (3); S3. After the test ring groove of the test rod (3) has been subjected to a preset stain adhesion time, the lifter (6) drives the lifting plate (2) to rise, thereby gradually pulling the test rod (3) out of the stain chamber (101). S4. After the test rod (3) is completely pulled out, the distance probe (104) of the stain box (1) detects the liquid level of the stain source in the corresponding stain chamber (101). If the liquid level is detected to be lower than the preset value, liquid stain source is injected into the stain chamber (101) through the filling tube (105). S5. The displacement component once again drives the lifter (6) and the lift plate (2) to move, so that the test rod (3) carrying the stain reaches directly above the washing test box (9); S6. The lifting device (6) drives the lifting plate (2) to descend, so that the test rod (3) is fully inserted into the corresponding diversion channel (903) inside the washing test box (9); S7. The washing liquid supply pipe (10) continuously supplies washing liquid to the flow chamber (901) of the washing test box (9). The washing liquid flows evenly into each diversion channel (903) and is finally discharged from the turbid liquid drain pipe (12). At the same time, the ultrasonic vibrator (904) of the bottom plate of the diversion channel (903) is activated to enhance the efficiency of the interaction between the washing liquid and the stains on the test rod (3). S8. After the washing liquid is supplied according to the preset washing time, the washing liquid supply pipe (10) stops supplying, the lifter (6) drives the lifting plate (2) to rise, and drives the test rod (3) to be pulled out from the diversion channel (903); S9. By using testing instruments or manual methods, check the residue of stains in different test ring grooves (301) on each test rod (3) to evaluate the cleaning effect of detergent on different stains and complete a single test process.

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