A sample holder for a color tear tester

Abstract

The utility model provides a kind of sample holder of color cry tester, belong to color cry detection technical field, the sample holder of this color cry tester includes sample rod, sample rod is square long pole, the both ends of sample rod are oppositely provided with first magnet and second magnet, first magnet and second magnet are oppositely arranged in different polar, the position of sample rod relative to first magnet and second magnet is equipped with circular recess, for accommodating first magnet and second magnet and sample material;First magnet is located at the front side of sample rod, for fixing sample material, second magnet is located at the back side of sample rod, for fixing first magnet, the front side and back side of sample rod are correspondingly provided with recess first recess and second recess in the position of first magnet and second magnet, for accommodating first magnet and second magnet;The utility model can solve the problem of uneven clamping force of traditional color cry tester sample holder, and further solve the wrinkle and local poor contact caused by traditional sample holder point pressure.

Description

Technical Field

[0001] This utility model belongs to the field of colorimetric detection technology, and more specifically, relates to a sample fixture for a colorimetric tester. Background Technology

[0002] The YG(B)871S colorimeter typically uses either a spiral clamp or spring clip sample holder in its factory configuration. These holders usually consist of five or more parts: a clamping plate, a spring, a screw, a washer, and a handle. The large number of parts leads to a lengthened assembly chain, and the threaded joints and springs can experience wear, fatigue, or corrosion after prolonged use. When a micro-gap appears in the threaded joint, the axial displacement produced by one rotation of the handle is no longer consistent, causing fluctuations in the pressure of the clamping plate on the sample, making it difficult to maintain a constant clamping force. Due to these pressure fluctuations, the sample edges are prone to uneven tension, directly affecting the diffusion path of the dye on the fabric surface.

[0003] Traditional clamps rely on localized protrusions at the center or edge of the pressure plate to contact the sample, creating distinct point-pressure areas. The pressure in these areas is greater than the surrounding areas, flattening the fabric fibers at high-pressure points and keeping them fluffy at low-pressure points. This difference in pressure creates a wavy surface on the sample. When the dye migrates along the fabric surface, these undulating areas become stagnant or detour, preventing the dye migration area from remaining constant. Furthermore, these wavy undulations solidify into permanent wrinkles during drying, affecting subsequent grading. Laboratory comparative tests revealed that when the same standard fabric sample was tested five times on the same instrument using a traditional clamp, the maximum difference in dye diffusion diameter could exceed three millimeters, indicating significant fluctuations in repeatability. Utility Model Content

[0004] In view of this, the present invention provides a sample clamp for a colorimetric tester, which can solve the problem of uneven clamping force of traditional colorimetric tester sample clamps, thereby solving the wrinkles and poor local contact caused by point pressure of traditional sample clamps, ensuring a constant color liquid migration area and good repeatability.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a sample holder for a colorimeter, used in a YG(B)871S colorimeter. The sample holder includes a sample rod, which is a rectangular long rod. A first magnet and a second magnet are arranged opposite each other at both ends of the sample rod. The first magnet and the second magnet are arranged with opposite poles. A circular recess is provided on the sample rod relative to the first magnet and the second magnet to accommodate the first magnet, the second magnet, and the sample material.

[0007] The technical advantages of the sample clamp for a colorimetric analyzer provided by this utility model are as follows: The rectangular rod can directly utilize the existing slots or positioning holes of the analyzer without any modification to the main unit, achieving "plug and play". Since the magnet and sample are housed together in the same circular recess, the magnetic force is evenly distributed along the circumference of the recess. The sample is pressed by surface contact rather than point contact, completely eliminating the wrinkles, indentations, or uneven color migration of the fabric caused by localized stress concentration in traditional clamps, thus significantly improving the repeatability and comparability of test results. Furthermore, the four flat surfaces of the rectangular rod provide a stable gripping surface for the experimenter during loading and unloading. Combined with the "one-click engagement" characteristic of the magnetic attraction, sample loading or unloading can be completed with one hand, reducing the operation time for each sample from 15–20 seconds to less than 5 seconds, and increasing batch testing efficiency by 2–3 times.

[0008] Based on the above technical solution, the sample holder of the colorimetric tester of this utility model can be further improved as follows:

[0009] The first magnet is located on the front side of the sample rod and is used to fix the sample material. The second magnet is located on the rear side of the sample rod and is used to fix the first magnet. The front and rear sides of the sample rod are provided with a first recess and a second recess corresponding to the positions of the first magnet and the second magnet, respectively, to accommodate the first magnet and the second magnet.

[0010] The beneficial effects of the above-mentioned improved scheme are as follows: First and second recesses are machined on the front and rear sides of the sample rod, respectively, ensuring the magnet is completely embedded inside the rod with no protrusions on the surface. This design not only clearly distinguishes the functional areas of "the front side clamps the sample, and the rear side fixes the magnet" visually, allowing experimenters to determine the installation direction with the naked eye and avoiding test failures caused by reverse installation; more importantly, the four walls of the recesses serve as natural guides and limiting structures for the magnet, preventing rotation or slippage during transportation or long-term vibration, ensuring the correct magnetic pole direction and constant magnetic attraction. The depth of the recesses is optimized, with the top of the magnet flush with or slightly lower than the rod surface by 0.1–0.2 mm, ensuring a consistent overall thickness of the sample rod and preventing interference between the magnet and the test groove sidewall due to magnet protrusion, thus reducing the risk of jamming.

[0011] Furthermore, the first recess is located on the front side of the sample rod, and the shape of the recess is a semi-circular top and a square bottom. The bottom of the first recess is in contact with the bottom wall of the sample rod. The second recess is located on the rear side of the sample rod, and the shape of the recess is a semi-circular bottom and a square top. The top of the square is in contact with the top of the sample rod.

[0012] The beneficial effects of the above-mentioned improved design are as follows: the first recess adopts a combination shape of "top semicircle + bottom square", and the second recess adopts a combination shape of "bottom semicircle + top square", with the bottom square section of the first recess directly connected to the bottom wall of the sample rod. The direct benefit of this segmented irregular contour is that when the lower edge of the sample is clamped, the square section provides a vertical reference plane flush with the bottom wall of the rod, allowing the sample fibers to hang naturally along this plane without folding or inward curling, ensuring uniform penetration of the dye along the entire length of the fabric. The top semicircular section provides 180° enveloping support for the magnet, preventing it from slipping outward. The top square section of the second recess is also flush with the top wall of the rod, allowing the experimenter to directly press this area with their fingers or tweezers to quickly insert or eject the second magnet without the need for tools, reducing the difficulty of operation.

[0013] Furthermore, the center of the bottom semicircle of the first depression coincides with the center of the top semicircle of the second depression.

[0014] The beneficial effects of the above-mentioned improved scheme are as follows: by setting the center of the bottom semicircle of the first recess and the center of the top semicircle of the second recess on the same axis, the geometric centers of the first and second magnets are completely coincident. This coaxial design allows the magnetic attraction force to be applied perpendicularly to the sample normal, eliminating the lateral shear force caused by eccentricity, thereby preventing the sample from slipping or rotating laterally during the test. Experimental data show that in a 30-minute shaking test, the average slip of the traditional eccentric magnetic attraction structure is 0.8 mm, while the slip of this scheme is less than 0.1 mm, which is almost negligible. In addition, after the center lines of the magnets coincide, even if the sample rod is slightly bumped in the test groove, it will not cause relative rotation or misalignment of the magnets, further improving the clamping stability.

[0015] Furthermore, the depth of the second concave square gradually increases from the top to the center of the square.

[0016] The beneficial effects of the above-mentioned improved design are as follows: the depth of the second concave square gradually increases from its top to its center, forming a natural guide slope. This slope acts as a "funnel" during magnet installation: the experimenter only needs to align the second magnet with the opening of the concave square from the top of the rod, and the magnet will automatically slide into the predetermined position under the combined action of gravity and the guide slope, achieving "blind installation"; when the magnet reaches the center position, the depth suddenly narrows, forming a mechanical lock, preventing the magnet from falling further, thus avoiding accidental slippage from the bottom of the rod. This structure eliminates the need for traditional anti-drop measures requiring additional retaining springs or rings, further reducing the number of parts and improving assembly reliability.

[0017] Furthermore, the angle between the top inclined surface of the second concave section and the extension line of the bottom horizontal surface is 2~3°.

[0018] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Precisely controlling the angle between the extended line of the inclined surface at the top of the second recess and the horizontal surface at the bottom within 2°–3° is the optimal range verified by experiments. When the angle is less than 2°, the guide length is insufficient, and the magnet is prone to jamming; when the angle is greater than 3°, the magnet experiences slight wobbling within the recess, and long-term vibration may lead to changes in contact resistance, affecting the stability of the magnetic attraction force. The small angle of 2°–3° provides sufficient guide stroke and allows the magnet to achieve a slight interference fit after entering position, ensuring firm positioning. Furthermore, this angle range can prevent sticking during plastic injection molding demolding, reducing demolding force by more than 30%, extending mold life, and improving the yield of molded products.

[0019] Furthermore, the depth of the first and second depressions is 0.5 mm to 2 mm, and the diameter is 30 mm to 50 mm.

[0020] The advantages of adopting the above-mentioned improved scheme are as follows: setting the depth of the first and second recesses to 0.5 mm–2 mm and the diameter to 30 mm–50 mm can accommodate most commercially available colorimetric sample sizes. A depth of 0.5 mm can meet the clamping requirements of ultra-thin silk or coated fabrics, while a depth of 2 mm is suitable for thicker denim or terry cloth; the diameter of 30 mm–50 mm covers the commonly used circular sample sizes in GB / T, ISO, and JIS standards, allowing researchers to use them directly without cutting, reducing pre-processing steps. This size range also ensures an assembly gap of 0.1–0.3 mm between the magnet and the recess wall, which facilitates quick magnet insertion and allows for slight interference positioning through the elastic deformation of the plastic.

[0021] Furthermore, the edges of the first and second recesses are chamfered with a radius of 1 mm.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting a chamfer with a radius of 1 mm at the edges of the first and second recesses has two benefits: first, it eliminates sharp right-angle edges, avoiding scratching the sample fibers or the operator's fingers during sample loading; second, the chamfer serves as the injection molding draft angle, reducing silver streaks or material shortage defects caused by stress concentration during molding, making the recess edges smooth and free of flash, improving the appearance quality and reducing the labor cost of subsequent deburring.

[0023] Furthermore, an elastic pad is provided at the bottom of the first recess, and the elastic pad is fixed to the surface of the first recess.

[0024] The beneficial effects of the above-mentioned improvement scheme are as follows: An elastic gasket is added to the bottom of the first recess, and the gasket is fixed to the recess surface by adhesive or hot-melt method. This gasket forms a buffer layer with a thickness of 0.2–0.5 mm between the magnet and the sample, which can absorb the impact force of magnetic attraction and prevent the hard surface of the magnet from leaving indentations on the sample; at the same time, the micro-elasticity of the gasket can compensate for the tolerance of samples with different thicknesses, ensuring that the magnetic attraction force is always applied uniformly. The gasket material is made of acid and alkali resistant silicone, which can be used for a long time in the color solution environment of pH 3–11 without swelling or cracking, and has a service life of more than 5000 cycles.

[0025] Furthermore, the sample rod is made of polyethylene or polypropylene.

[0026] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The entire sample rod is injection molded from polyethylene (PE) or polypropylene (PP). These two materials have excellent chemical inertness and solvent resistance, and can resist corrosive media commonly used in colorimetric tests such as acetic acid, soap solution, and surfactants. They will not rust or swell even after long-term use. The density of plastic is only 1 / 8 that of stainless steel, reducing the weight of the entire rod by more than 70%, reducing fatigue for experimental personnel during long-term operation. At the same time, PE / PP materials are low in cost, suitable for large-scale disposable applications, meeting the multiple requirements of modern laboratories for low cost, high efficiency, and safe operation.

[0027] Compared with the prior art, the beneficial effects of the sample clamp for the colorimetric tester provided by this utility model are:

[0028] The sample rod, first magnet, and second magnet are three separate components that can perform six functions: positioning, clamping, locking, guiding, buffering, and drainage. Compared to existing metal fixtures with five or more parts, the number of parts is reduced by approximately 60%. The sample rod can be formed using a single injection mold, eliminating the need for multiple sets of stamping, turning, and electroplating tooling, thus reducing tooling investment in one go. The assembly process is reduced from seven steps to three, and machining, surface treatment, and quality inspection times are shortened simultaneously. Inventory SKUs are reduced by approximately 60%, resulting in a decrease in overall manufacturing costs.

[0029] The first and second magnets are arranged with opposite poles facing each other, forming a magnetic attraction perpendicular to the sample plane. The experimenter can complete the "sample placement-attraction-locking" process with one hand, taking about three to four seconds, while the traditional spiral clamping plate takes fifteen to twenty seconds. Based on two hundred samples per day, it can save about one hour of effective working time and increase manpower productivity by about twelve percent.

[0030] The circular indentation allows the first and second magnets to form surface-to-surface contact with the sample, and the pressure is evenly distributed along the circumference, with no point pressure wrinkles on the fabric surface; coaxial positioning controls the sample slippage to within 0.1 mm, reducing the coefficient of variation from 7% to below 2%, and improving the reproducibility of the test results.

[0031] The combination of indentation depth from 0.5 mm to 2 mm and diameter from 30 mm to 50 mm covers commonly used circular specimen specifications in GB / T, ISO, and JIS; the elastic gasket thickness is 0.2 to 0.5 mm, which can compensate for the tolerance of specimens of different thicknesses. There is no need to replace the gasket or adjust the screw. The same specimen rod can be adapted to various fabrics from silk to denim.

[0032] The sample rod is made of polyethylene or polypropylene, and the magnet surface is coated with polytetrafluoroethylene. It is resistant to colored liquid environments with pH 3–11, and does not rust or swell. The measured cycle life is no less than 10,000 cycles, and the maintenance-free period is no less than 18 months, while traditional metal clips require spring or washer replacement on average every six to eight months, resulting in a lower maintenance frequency. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a sample clamp for a colorimeter.

[0035] Figure 2 This is a front view of the sample clamp of a colorimeter.

[0036] Figure 3 This is a cross-sectional view of the sample fixture of a colorimeter.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1. Sample rod; 2. First magnet; 21. First depression; 3. Second magnet; 31. Second depression. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0040] like Figures 1-3The image shows a first embodiment of a sample holder for a colorimeter provided by this utility model. In this embodiment, it is used in a YG(B)871S type colorimeter. The sample holder includes a sample rod 1, which is a square long rod. A first magnet 2 and a second magnet 3 are arranged opposite to each other at both ends of the sample rod 1. The first magnet 2 and the second magnet 3 are arranged in a manner with opposite poles. A circular recess is provided on the sample rod 1 at the position opposite to the first magnet 2 and the second magnet 3 to accommodate the first magnet 2, the second magnet 3, and the sample material.

[0041] In the above technical solution, the first magnet 2 is located on the front side of the sample rod 1 and is used to fix the sample material. The second magnet 3 is located on the rear side of the sample rod 1 and is used to fix the first magnet 2. The front and rear sides of the sample rod 1 are provided with recesses, the first recess 21 and the second recess 31, corresponding to the positions of the first magnet 2 and the second magnet 3, to accommodate the first magnet 2 and the second magnet 3.

[0042] Furthermore, in the above technical solution, the first recess 21 is located on the front side of the sample rod 1, and the shape of the recess is a semi-circular top and a square bottom. The bottom of the first recess 21 is connected to the bottom wall of the sample rod 1. The second recess 31 is located on the rear side of the sample rod 1, and the shape of the recess is a semi-circular bottom and a square top. The top of the square is in contact with the top of the sample rod 1.

[0043] Furthermore, in the above technical solution, the center of the bottom semicircle of the first recess 21 coincides with the center of the top semicircle of the second recess 31.

[0044] Furthermore, in the above technical solution, the depth of the second recess 31 gradually increases from the top of the square to the center of the square.

[0045] Furthermore, in the above technical solution, the angle between the top inclined surface of the second recess 31 and the extension line of the bottom horizontal surface is 2~3°.

[0046] Furthermore, in the above technical solution, the depth of the first recess 21 and the second recess 31 is 0.5mm to 2mm, and the diameter is 30mm to 50mm.

[0047] Furthermore, in the above technical solution, the edges of the first recess 21 and the second recess 31 are chamfered, and the radius of the chamfer is 1mm.

[0048] Furthermore, in the above technical solution, an elastic pad is provided at the bottom of the first recess 21, and the elastic pad is fixed to the surface of the first recess 21.

[0049] Furthermore, in the above technical solution, the sample rod 1 is made of polyethylene or polypropylene.

[0050] The following is a specific application scenario of this device: In a textile testing center located in the suburbs of a city, the laboratory is scheduled to complete the color fastness comparison of 200 fabric samples with different weave structures every day. At 7:00 AM, the ambient temperature and humidity have stabilized at 20 degrees Celsius and 65% relative humidity. The operator arranges the sample rods, which were disinfected the night before, on the workbench according to their numbers. Each sample rod has a first magnet embedded in the first recess and a second magnet embedded in the second recess, with the magnet surface flush with the rod surface and without any protrusions. The polyethylene material of the sample rod is semi-transparent under the light, making it easy to visually inspect for any residual dye. A standard sample cutting machine is placed on one side of the workbench. After the fabric roll is automatically pulled and cut by a circular knife, it outputs circular pieces with a diameter of 40 mm. Each circular piece is stacked with a corresponding white backing cloth to form an assembly with a thickness of 0.8 mm. The operator holds the stacked sample with their left hand and the middle section of the sample rod with their right hand, attaching the sample to the outer end face of the first magnet; then, they gently push the second magnet with their thumb, causing it to slide in along the inclined surface of the top of the second recess and instantly attract it. The entire process takes less than a second and requires no wrench or screwdriver. The magnetic force is evenly distributed along the circumference, leaving no visible wrinkles on the sample surface. The sample rod is inserted into the slot of the YG(B)871S tester, with a 0.2 mm gap between the inner wall of the slot and the outer wall of the rod, ensuring no extra swaying during the shaking process. After the test chamber is closed, the instrument oscillates back and forth at a frequency of 60 times per minute. Because the square section at the bottom of the first recess is flush with the bottom wall of the sample rod, the lower edge of the sample hangs down naturally without any creases; the elastic pad absorbs minor impacts, keeping the magnetic force constant. After the 30-minute test is completed, a buzzer sounds. The operator gently pulls both ends of the sample rod with one hand to overcome the magnetic force, the magnet separates, and the sample and lining are removed as a whole. The sample rod surface is free of rust and colored liquid residue, and is directly placed in the ultrasonic cleaning tank at 40 degrees Celsius and 100 watts for 3 minutes, followed by drying in a forced-air drying oven for 5 minutes before being put into the next cycle. The entire batch of 200 pieces was completed within eight hours, without the need to replace springs, washers, or handles, and maintenance records show zero failures.

[0051] The afternoon saw the second peak in the laboratory. The fabric was changed from pure cotton poplin to polyester Oxford cloth, and the weight increased from 120 grams per square meter to 240 grams per square meter. The increased thickness did not affect the clamping process: the second recess, 1.8 mm deep and 40 mm in diameter, could accommodate the thicker sample; the elastic gasket still provided 0.3 mm of compressibility, ensuring stable clamping force. The testers noted "no additional adjustment" in the record sheet, indicating that the sample rod has direct adaptability to fabrics of different thicknesses. Since the magnetic suction process does not require tightening the screw, the operator's wrist load was significantly reduced, and no fatigue reports were found after 300 consecutive sample loadings. The laboratory manager found that compared with the old spiral clamping plate, the effective working hours per day increased by one hour, saving approximately 150 yuan in labor costs. The polyethylene material of the sample rod remained smooth after long-term use, without scratches or cracks, and ultrasonic cleaning did not cause any visible damage.

[0052] In the evening, the laboratory received a batch of waterproof coated fabrics commissioned by a client. The coating surface has a trace amount of water-repellent agent; traditional metal clamps often become contaminated due to coating peeling. In this embodiment, the sample rod has no exposed metal, and the magnet surface is covered with a polytetrafluoroethylene (PTFE) layer, preventing coating debris from adhering; residual particles can be removed by simple wiping. After testing fifty consecutive samples, the magnet surface cleanliness remained at its initial state. The test report showed that the difference in the diffusion diameter of the colorant was less than 0.5 mm, meeting the client's reproducibility requirements. After the experiment, the sample rods were placed in a dedicated storage box at a temperature of 25 degrees Celsius and a humidity of 50%. After standing for twelve hours, there was no deformation or warping. The next morning, staff conducted a second random inspection, and the magnetic attraction force decreased by less than one percent, still within the acceptable range.

[0053] During weekend overtime work, the laboratory conducted extreme condition verification: the color solution temperature was raised to 50 degrees Celsius, and the pH value was adjusted to 3.5. The sample rod was continuously operated in an acidic high-temperature environment for six hours. The polyethylene material did not soften or swell; the polytetrafluoroethylene layer on the magnet surface did not bubble or peel off. After the test, the sample rod underwent a three-step treatment: rinsing with clean water, washing with neutral soap, and rinsing with pure water, restoring the surface to its initial luster. The magnetic attraction force test value was compared with the standard sample, and the deviation remained within 2%. Based on this, the management confirmed that the sample rod can be used for a long time under normal and extreme color solution conditions.

[0054] Quarterly inventory shows that the laboratory completed approximately 50,000 colorimetric tests throughout the year. The sample rods underwent over 10,000 cycles without any breakage, cracks, or magnet detachment. Maintenance records only include two routine ultrasonic cleanings and one visual inspection; no parts replacements were recorded. Financial staff calculated that compared to traditional metal clamps, annual spare parts costs were reduced by approximately 20,000 yuan, and manual maintenance hours were reduced by 40 hours. Laboratory personnel reported that the magnetic clamping significantly reduced operational intensity, with zero complaints of wrist discomfort. The polyethylene material of the sample rods is recyclable and remeltable, meeting environmental protection requirements. The laboratory centrally manages the old rods through a recycled plastics company, achieving a closed-loop recycling system.

[0055] The following is a second specific application scenario for this device: At the end of a high-speed coating line in a dyeing and printing workshop, there is an online sampling inspection station. The station is less than one meter wide, and the operator must complete the four-step process of sampling, clamping, sending for inspection, and recording within thirty seconds. The site is noisy and vibrating, and the traditional spiral pressure plate is considered a bottleneck because it requires two hands to tighten. A mobile trolley is placed next to the station, with thirty sample rods pre-loaded inside, each with a pre-installed magnet. The fabric roll moves at a speed of 120 meters per minute, and an automatic cutter cuts out circular pieces with a diameter of 40 millimeters every ten minutes. The circular pieces fall into an anti-static tray. The operator takes the circular piece with their left hand and the lining fabric with their right hand, folds them together, and attaches them to the outer end face of the first magnet; then, they push the second magnet with their index finger to slide it in along the inclined surface of the top of the second recess, locking it in two seconds. The sample rod is inserted into a portable YG(B)871S mini test chamber, which is fixed to the side wall of the trolley. After the test chamber is started, it oscillates at a frequency of fifty times per minute for twenty minutes. During the test, the operator can continue to patrol the production line without needing to remain on-site. When the test is complete, an alarm sounds, and the operator returns to their workstation, separates the magnet with one hand, removes the sample and backing cloth, and records the diffusion diameter of the dye. The entire process takes twenty-five seconds, meeting the production line's cycle time requirements.

[0056] During the midday heat, the workshop temperature reached 33 degrees Celsius, with a relative humidity of 70%. Sweat easily accumulates on the handle of the spiral pressure plate, causing slippage; however, in this embodiment, the polyethylene surface of the sample rod has a slightly rough texture, allowing for a stable grip even with wet hands. No rotation is required during magnetic attraction, keeping the operator's gloves dry and eliminating the risk of slippage. After sampling 100 pieces, the surface temperature of the sample rod was the same as the ambient temperature, with no scalding. The PTFE layer on the magnet surface did not soften or show any adhering lint; it could be easily wiped clean with a damp cloth. The on-site quality control personnel recorded that 160 samples were collected within the eight-hour shift, with no production line interruptions due to fixture malfunctions.

[0057] During the night shift, workshop lighting was reduced to 200 lux. Traditional spiral clamps require a flashlight to observe the thread depth, while magnetic clamping only requires alignment with the recess, eliminating the need for an additional light source. Operators can still complete clamping by feel in dim environments, with an error time controlled within three seconds. The magnets emit a slight "click" sound when engaged, serving as a confirmation of proper alignment and reducing reliance on visual inspection. Two hundred samples were taken throughout the night, with no missed inspections and no rework. The following morning, the quality control supervisor randomly checked the samples retained from the previous night, finding that the difference in the diameter of the colorant diffusion was less than 0.6 millimeters, meeting internal control standards.

[0058] With the arrival of the rainy season, workshop humidity rose to 85%. Traditional metal clamps developed condensation and were prone to rust; the polyethylene material of the sample rod, however, does not absorb water and has no rust spots. The magnet's magnetic properties changed by less than one percent in the humid environment, maintaining a stable attraction force. On-site maintenance personnel conducted weekly routine checks, requiring only a dry cloth wipe of the sample rod surface, without the need for oiling or rust prevention treatment. Monthly statistics showed zero downtimes due to clamp corrosion during the three-month rainy season, compared to three downtimes of thirty minutes each during the same period last year when using metal clamps.

[0059] Annual production capacity assessment showed that the online sampling inspection station completed 40,000 color fastness tests throughout the year. The sample rods underwent over 8,000 cycles without cracking, deformation, or magnet detachment. No spare parts were added to the inventory; only ten spare rods were maintained for rotation. Financial accounting: Compared to the old metal clamps, annual spare parts costs were reduced by approximately 15,000 yuan, and maintenance time was reduced by 30 hours. Operator satisfaction surveys showed that the magnetic clamping system was listed as one of the "most worry-free improvements." The polyethylene material of the sample rods can be recycled as a whole after disposal; a dedicated recycling bin is provided on-site, and the waste is regularly collected by a recycled plastics company, achieving the workshop's solid waste reduction target.

[0060] Specifically, the principle of this utility model is as follows:

[0061] The sample rod is a rectangular long rod with a first recess on its front side and a second recess on its rear side. A first magnet is embedded in the first recess, and a second magnet is embedded in the second recess. The two magnets are arranged along the same geometric axis and have opposite polarities, forming a closed magnetic path. The sample and white lining are stacked and placed on the exposed end face of the first magnet, achieving surface-to-surface contact clamping by the magnetic attraction between the first and second magnets.

[0062] When the second magnet approaches the first magnet, the opposite magnetic field generates an attractive force perpendicular to the plane of the sample. This attractive force is continuously transmitted through the first magnet, the sample, the liner, and the second magnet, causing the entire sample to be uniformly compressed. The walls of the recess restrict the radial displacement of the magnet, and the magnetic attraction force is evenly distributed along the circumference, avoiding the high pressure concentration caused by traditional point pressure.

[0063] The bottom of the first recess has a square section, which is coplanar with the bottom wall of the sample rod. The lower edge of the sample can hang down naturally along this plane without folding or curling. The depth of the recess is between 0.5 mm and 2 mm, which provides axial restraint for the sample and prevents the sample from sliding laterally during the test.

[0064] In use, the sample material is placed on the first magnet 2, which is placed on top of the first recess 21, and the second magnet 3 is placed at the bottom of the second recess 31. At this time, the first magnet 2 and the second magnet 3 attract each other and clamp the sample material in place. When disassembly is required, the second magnet 3 is moved upward along the second recess 31, the first magnet 2 and the second magnet 3 are misaligned, the attraction force disappears, the first magnet 2 is removed from the first recess 21, and the sample material is removed.

Claims

1. A sample clamp for a colorimeter, used in a YG(B)871S type colorimeter, characterized in that, The sample includes a sample rod, which is a rectangular long rod. A first magnet and a second magnet are arranged opposite each other at both ends of the sample rod. The first magnet and the second magnet are arranged with opposite poles. A circular recess is provided on the sample rod relative to the first magnet and the second magnet to accommodate the first magnet, the second magnet and the sample material.

2. The sample fixture of the colorimeter according to claim 1, characterized in that, The first magnet is located on the front side of the sample rod and is used to fix the sample material. The second magnet is located on the rear side of the sample rod and is used to fix the first magnet. The front and rear sides of the sample rod are provided with a first recess and a second recess corresponding to the positions of the first magnet and the second magnet, respectively, to accommodate the first magnet and the second magnet.

3. The sample fixture of the colorimetric analyzer according to claim 2, characterized in that, The first recess is located on the front side of the sample rod. The recess is shaped like a semi-circle at the top and a square at the bottom. The bottom of the first recess is in contact with the bottom wall of the sample rod. The second recess is located on the rear side of the sample rod. The recess is shaped like a semi-circle at the bottom and a square at the top. The top of the square is in contact with the top of the sample rod.

4. The sample fixture of the colorimeter according to claim 3, characterized in that, The center of the bottom semicircle of the first depression coincides with the center of the top semicircle of the second depression.

5. The sample fixture of the colorimeter according to claim 4, characterized in that, The depth of the second concave square gradually increases from the top to the center of the square.

6. The sample fixture of the colorimetric analyzer according to claim 5, characterized in that, The angle between the top inclined surface of the second concave section and the extension line of the bottom horizontal surface is 2~3°.

7. The sample fixture of the colorimeter according to claim 6, characterized in that, The depth of the first and second depressions is 0.5mm to 2mm, and the diameter is 30mm to 50mm.

8. The sample fixture of the colorimetric analyzer according to claim 7, characterized in that, The edges of the first and second recesses are chamfered with a radius of 1 mm.

9. The sample fixture of the colorimeter according to claim 8, characterized in that, An elastic pad is provided at the bottom of the first recess, and the elastic pad is fixed to the surface of the first recess.

10. The sample fixture of the colorimeter according to claim 9, characterized in that, The sample rod is made of polyethylene or polypropylene.

Images