An auxiliary device for making bone marrow smears

Abstract

The utility model discloses an auxiliary device for making bone marrow smear, which aims to solve the problems of difficult manual pushing operation, low qualified rate, poor consistency and potential safety hazards in bone marrow smear making teaching test or bone marrow smear dyeing experiment. The device comprises a base, an oblique sliding plate and a liquid storage scraper. The top surface of the base is provided with a scraping groove for placing a glass slide, and the bottom surface is provided with an anti-skid structure. The oblique sliding plate is movably installed on the base and forms an angle of 30-45 degrees with the horizontal surface. The oblique surface is provided with a mounting clamping groove. The liquid storage scraper comprises a liquid storage bin and a liquid outlet gap. The liquid storage scraper is installed in the clamping groove along the oblique surface, and the bottom surface is parallel to the scraping groove. The bone marrow liquid flows to the bottom surface through the liquid outlet gap. The device reduces the operation threshold, improves the quality stability and safety of bone marrow smear, and is suitable for different experiments or teaching scenes such as basic practice, multiple group comparison and standardized demonstration. The qualified rate of bone marrow smear is significantly improved compared with manual operation.

Description

Technical Field

[0001] This utility model relates to the field of bone marrow smear preparation technology, and specifically to an auxiliary device for preparing bone marrow smears. Background Technology

[0002] Bone marrow smears are a crucial technical step in the diagnosis, teaching, and research of hematological diseases, and their quality directly affects the accuracy of cell morphology observation, cell proportion statistics, and subsequent diagnostic results. Currently, the mainstream method for preparing bone marrow smears in clinical practice and teaching experiments is manual operation using a glass slide. This method requires the operator to hold the glass slide and push bone marrow droplets onto the slide at a certain angle, force, and speed to form a smear. However, in practical applications, especially in teaching experiments and student experiments where multiple smears need to be prepared in batches, the existing manual operation method has many inconveniences and limitations, as follows:

[0003] 1. Manual operation parameters are difficult to control, resulting in a low smear pass rate. The quality of bone marrow smears depends on the precise coordinated control of the pushing angle, force, and speed: the pushing angle needs to be maintained stably between 30° and 45°; too large an angle will result in a smear that is too thin and sparsely populated, while too small an angle will result in a smear that is too thick and has overlapping cells; the pushing force needs to be uniform and moderate; too heavy a force will cause cell breakage, while too light a force will prevent the bone marrow fluid from spreading evenly; the pushing speed needs to be kept steady, as too fast a speed will make it difficult to form the characteristic "feathered tail," while too slow a speed will cause the smear to dry too quickly, leading to cell aggregation. In teaching and experimental scenarios, students, as novices, lack the "feel" developed through long-term practice and find it difficult to accurately control the above parameters, resulting in a generally low smear pass rate. A large number of unqualified smears need to be remade, which not only wastes bone marrow specimens and experimental consumables, but may also require repeated punctures due to insufficient specimens, increasing the suffering of subjects and experimental costs.

[0004] 2. Poor consistency in batch preparation negatively impacts teaching effectiveness. Teaching experiments often require multiple students to operate simultaneously or a single student to prepare multiple smears consecutively to complete the exercise. Since manual operation is highly dependent on individual experience and hand condition, even the same student may experience fluctuations in the angle and force applied when preparing multiple smears due to hand fatigue. The differences in operation between different students are even more significant, resulting in inconsistent batch smear quality—some smears show well-dispersed cells, while others show overlapping or broken cells, and some even contain no bone marrow particles, rendering them invalid. This inconsistency severely affects teaching effectiveness: on the one hand, students struggle to establish a unified understanding of quality by comparing with standard smears; on the other hand, teachers must spend considerable time selecting qualified smears when explaining cell morphology observation, reducing teaching efficiency and hindering students' mastery of the standardized bone marrow smear preparation process.

[0005] 3. The glass pusher poses safety hazards and operational limitations; although the glass pushers used in existing technologies possess chemical inertness and optical properties, the material is fragile and has sharp edges. In teaching experiments, students who are not proficient in operating the pusher may cause it to slip or break due to improper force, posing a risk of hand injuries.

[0006] In summary, the current method of manually preparing bone marrow smears using glass slides presents numerous inconveniences in teaching experiments and student trials where multiple smears need to be prepared in batches. These inconveniences include high operational difficulty, low pass rate, poor consistency, and safety hazards. Therefore, there is an urgent need for an auxiliary slide-pushing device that can lower the operational threshold, improve the stability of smear quality, and adapt to the needs of teaching scenarios. This device would address the shortcomings of existing technologies and promote the standardization and efficiency of bone marrow smear preparation technology in teaching and clinical applications. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides an auxiliary device for preparing bone marrow smears. Through a structural design that features a fixed angle, uniform pressure, and simple pushing mechanism, it replaces the reliance on manual experience in preparing bone marrow smears using glass slides, solving the problems of low smear pass rate and poor consistency. At the same time, through safe materials and a convenient structure, it can meet the needs of batch and multiple preparation of bone marrow smears in teaching experiments or other experiments.

[0008] Specifically, this utility model is implemented as follows: an auxiliary device for preparing bone marrow smears includes: a base with a top surface having a scraper groove for placing a glass slide; a bottom surface for placing and fixing on a tabletop, with the scraper groove facing upwards, and the glass slide to be smeared can be inserted into or placed in the scraper groove; the bottom surface of the base is provided with an anti-slip pad or suction cup structure; an inclined sliding plate, movably mounted on the base, capable of sliding horizontally along the length of the scraper groove; a downward-opening mounting slot is provided on the inclined surface; the inclined sliding plate forms an angle between 30-45° with the horizontal plane; a liquid storage scraper, including a liquid storage chamber and a liquid discharge slit, the liquid storage scraper being obliquely mounted in the mounting slot along the inclined surface of the inclined sliding plate, the bottom surface of the liquid storage scraper being flat and parallel to the groove surface of the scraper groove; the liquid discharge slit is arranged along the length of the bottom surface, its upper end connecting to the liquid storage chamber and its lower end connecting to the bottom surface of the liquid storage scraper. The storage chamber is an upwardly convex cavity with an open top or a filling port. The longitudinal cross-sectional shape of the lower fluid slit gradually widens from bottom to top. The storage chamber contains collected and processed bone marrow fluid of appropriate concentration, avoiding both excessive thinness and excessive thickness. The bone marrow fluid flows downward into the lower fluid slit opening. Due to the surface tension of the bone marrow fluid, it gets stuck at the slit opening. When it comes into contact with the surface of the glass slide, it is partially expelled. At this point, the inclined sliding plate is pushed, causing the storage scraper to slide quickly from one end of the glass slide to the other, spreading the bone marrow fluid in contact with the glass slide evenly and smoothly.

[0009] Furthermore, a raised retaining edge is formed between the two long sides of the base and the edge of the scraping groove, and a concave sliding groove is provided below the outer side of each retaining edge; the bottom sides of the inclined sliding plate are provided with lateral sliding grooves and lateral sliders that are adapted to the retaining edge and the sliding groove respectively; the scraping groove and the sliding groove are both pulled to the outer end of the base in the same direction; the inclined sliding plate is also provided with a limit stop below the lateral slider, and a limit pin that can be inserted or pulled out laterally is installed below one end of the sliding groove opening of the base; the limit stop will interfere with the inserted limit pin to achieve the limiting function and prevent slippage.

[0010] Furthermore, the longitudinal length of the mounting slot is greater than the longitudinal length of the liquid storage scraper, and the width is adapted to the width of the liquid storage scraper; the bottom sides of the liquid storage scraper are provided with outwardly protruding lugs; the lower part of the mounting slot is provided with a downwardly communicating inner groove, and the top of the inner groove is provided with a notch adapted to the size of the lug, so that the liquid storage scraper can be inserted into the mounting slot through the notch, and the lug can slide down along the inner groove to install the liquid storage scraper in the mounting slot; an elastic component is installed on the top of the mounting slot, and the movable end of the elastic component presses against the top surface of the liquid storage scraper to make the liquid storage scraper continuously provide downward pressure. This design allows for the detachable installation of the liquid storage scraper. The elastic component provides stability during use and contact stability with the glass slide during the pushing process. The lug and notch serve as the entry and exit points for disassembly and installation, with the lug acting as a limiting slider within the inner groove. The elastic component is a spring sheet, integrally formed, which, after bending, has one end inserted into the upper gap of the mounting slot, while the other end provides an elastic force for top support and reset on the top surface of the liquid storage scraper. Alternatively, the elastic component can be composed of a spring and a guide push rod.

[0011] Furthermore, an opening groove is provided in the upper middle part of the mounting slot, and a protrusion is provided on the side of the liquid storage scraper that can be inserted into the opening groove. The protrusion can slide up and down along the opening groove to move the liquid storage scraper upward in the inner groove, so that the liquid storage scraper can be removed and disassembled. This design facilitates the lifting of the liquid storage scraper by the operator. On the one hand, it is convenient to lift the liquid storage scraper by pushing the protrusion upward when disassembling the liquid storage scraper; on the other hand, during the process of pushing the slide, when it is close to the end, the operator can lift the protrusion upward to separate the liquid storage scraper from the glass slide, so as to prevent more bone marrow fluid from accumulating at the end of the glass slide. It can also form a "feather-like" dispersion at the end of the smear during the separation process, which is convenient for observing the morphology of individual cells.

[0012] Further preferably, to avoid manual lifting operations during the slide-pushing process, the inner end of the inclined slide plate located on the edge has a notch. After the lug moves down to its position, part of it is exposed at the notch. An upwardly protruding ramp is provided at the end of the edge, with the ramp's slope facing the other end of the edge. As the fluid-collecting scraper pushes towards its end, the lug begins to contact the ramp at the notch and is gradually lifted as the ramp rises, separating it from the slide, eliminating the need for manual control. After the bone marrow smear is prepared, the slide can be removed, and a new slide can be inserted. The fluid-collecting scraper can be lifted and reset by pushing the protrusion, allowing for the next smear preparation.

[0013] Furthermore, the liquid storage scraper is a split design, including a base plate and a cover plate. Recessed holes are provided at corresponding positions on the four corners of the base plate and cover plate, and corresponding magnetic suction components are fixedly installed within these holes. The contact surfaces of the base plate and cover plate are parallel to each other. A recessed groove is provided on the side of the cover plate opposite to the base plate, connecting the liquid storage chamber and the liquid drain slit. The base plate and cover plate can be made of high-molecular resin materials, such as PMMA / acrylic / plexiglass, which have the characteristics of high surface hardness, good processing performance, resistance to breakage, and high safety. The significance of this design is that, through magnetic positioning, the base plate and cover plate can be precisely and firmly connected and installed. The grooved structure of the liquid storage chamber and the liquid drain slit is integrated into the cover plate. When connected to the base plate, it facilitates the addition of bone marrow fluid or the preparation of smears, or allows for removal and separate cleaning. Improved convenience: In practical use, one type of bone marrow fluid added to the reservoir can prepare 4-6 smears, or in teaching experiments where a large batch of a dozen or dozens of bone marrow smears needs to be prepared, thus improving smear efficiency. The reservoir scraper can be labeled, allowing for the replacement of different bone marrow fluids for different experiments.

[0014] The working principle of this utility model is as follows: When the auxiliary device is working, the table is first fixed by the anti-slip pad or suction cup of the base. The glass slide is placed into the scraping groove and limited by the edge. Then, the liquid storage scraper containing bone marrow fluid is inserted into the mounting groove of the inclined slide plate. The elastic component makes its bottom surface parallel and attached to the glass slide, while the inclined slide plate maintains a fixed angle of 30-45°. The inclined slide plate is pushed quickly by hand and slid smoothly along the groove. The bone marrow fluid in the storage chamber is evenly and thinly scraped onto the glass slide through the "wide at the top and narrow at the bottom" liquid slit. During the pushing process, the liquid storage scraper automatically separates from the inclined platform by contacting the lug or is manually pushed up to separate the lug, so that the end forms a "feather-shaped tail", thereby completing the preparation of bone marrow smears. Each liquid storage chamber can meet the capacity requirements for preparing at least 6 smears. The liquid storage scraper is made of safe polymer resin material and can be disassembled and cleaned after use, realizing the standardized, batch and efficient preparation of bone marrow smears.

[0015] The advantages compared to existing technologies include:

[0016] (1) Improve the stability and pass rate of smear quality: By using a 30-45° fixed angle preset by the inclined slide plate, the elastic component provides uniform downward pressure, and the slide groove guides to achieve smooth sliding, it replaces the reliance on manual experience and avoids problems such as excessively thick or thin smears, cell breakage or overlap caused by fluctuations in angle / force / speed, thus significantly improving the pass rate of smears.

[0017] (2) Ensure consistency of batch operations and adapt to teaching scenarios: Standardized sliding stroke, liquid volume control and operation process ensure that the quality of smears is similar when the same operator makes them continuously or when multiple operators operate simultaneously, which makes it easier for students to establish a unified quality awareness and reduces the time cost for teachers to screen qualified smears.

[0018] (3) Eliminate safety hazards and improve operational safety: The liquid storage scraper is made of polymer resin material, replacing the fragile and sharp glass pusher, avoiding the risk of the pusher breaking and cutting the hand when the operator is not familiar with the operation, and improving the safety of teaching and experimental operations.

[0019] (4) After adding bone marrow fluid once, multiple slides can be prepared, eliminating the need to add bone marrow fluid each time and improving the efficiency of bone marrow smear preparation. Attached Figure Description

[0020] Figure 1 A three-dimensional structural diagram of a bone marrow smear assist device;

[0021] Figure 2 A schematic cross-sectional view of a bone marrow smear assist device;

[0022] Figure 3 for Figure 2 Enlarged structural diagram of section I;

[0023] Figure 4 An exploded view of the structural configuration of a bone marrow smear assist device;

[0024] Figure 5 A three-dimensional structural diagram of the liquid storage scraper;

[0025] Figure 6 , Figure 7 This is a schematic diagram of the loading and unloading operation between the liquid storage scraper and the inclined sliding plate in Example 2;

[0026] Figure 8 , 9 10 is a schematic diagram of the operation process of a bone marrow smear assist device in completing a bone marrow smear in Example 2;

[0027] Figure 11 , 12This is a schematic diagram of the structure of the detachable liquid storage scraper using a split magnetic combination in Example 2;

[0028] Figure 13 This is a three-dimensional structural view of the bone marrow smear assist device with a ramp in Example 3;

[0029] Figure 14 This is a schematic diagram of the structure in contact between the lug and the inclined platform during the sliding process;

[0030] Figure 15 A side view of the structure in contact with the lug and the inclined platform during the sliding process.

[0031] Figure label:

[0032] 1—Base, 11—Groove, 12—Side guard, 13—Slide groove, 14—Sloping platform

[0033] 2—Slide,

[0034] 3—Angled slide plate, 31—Mounting slot, 32—Side slide groove, 33—Side slider, 34—Limit stop, 35—Limit pin, 36—Inner groove, 37—Notch, 38—Spring piece, 39—Opening groove

[0035] 4—Liquid storage scraper, 41—Liquid storage chamber, 42—Liquid drain slit, 43—Lug, 44—Protrusion, 45—Liquid filling port, 46—Bottom plate, 47—Cover plate, 48—Concave hole. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figure 1-3 As shown, this embodiment provides a bone marrow smear assist device, the structure of which is as follows:

[0039] Base 1: Made of ABS engineering plastic through one-piece injection molding, the base is rectangular in shape, measuring 10cm in length, 4cm in width, and 4cm in height. A scraper groove 11 extending along the length direction is formed in the center of the top surface. The groove 11 is 7cm long, 2.8cm wide, and 0.5cm deep, capable of holding a standard glass slide 2. The slide 2 can be stably placed into the groove 11, with at least one edge adhering to one side of the groove 11, and the end contacting the top edge of the groove 11 for positioning. Four silicone anti-slip pads or suction cups are adhered to the bottom surface of base 1, located at the four corners. Each anti-slip pad measures 1cm × 1cm × 0.2cm, ensuring the device does not slide on the experimental table.

[0040] The inclined sliding plate 3 is also made of ABS plastic, with an angle of 35° to the horizontal plane, ideally within the range of 30° to 45°. The inner sides of both sides of the bottom of the sliding plate are integrally formed with side grooves 32 and side sliders 33. The side grooves 32 are adapted to the side guards 12 on the two long sides of the base 1, and the side sliders 33 are embedded in the concave grooves 13 on the lower outer side of the base 1, allowing the inclined sliding plate 3 to slide horizontally along the length of the grooves 11. A downward-opening mounting slot 31 is provided in the middle of the inclined surface of the sliding plate.

[0041] The liquid storage scraper 4 is made of PMMA acrylic material. Its top is an open-top liquid storage tank 41 with a volume of approximately 5 mL. The liquid storage tank 41 is connected to a flow channel 42 below. The flow channel 42 is arranged along the length of the bottom surface of the liquid storage scraper 4, with a longitudinal cross-section in the shape of an inverted trapezoid. The lower channel is narrower than the upper channel; the specific spacing is designed to ensure the bone marrow fluid flows down evenly and slowly without dripping. The liquid storage scraper 4 is installed in the mounting slot 31 along the inclined surface of the sliding plate 3. It is fixed by an interference fit between the slot and the scraper. The bottom surface of the scraper is parallel to the surface of the scraping groove 11, and the spacing is controlled within the range suitable for the thickness of the glass slide 2.

[0042] The usage process of this embodiment is as follows: Place the glass slide 2 into the scraper groove 11 of the base 1. Add 3 mL of bone marrow fluid (treated with anticoagulation, with a suitable cell concentration) to the storage chamber 41 of the liquid storage scraper 4. Under the action of gravity, the bone marrow fluid flows along the lower liquid slit 42 to the bottom surface of the scraper. Due to surface tension, a liquid film is formed at the slit opening, and the liquid film contacts the glass slide 2. The operator holds the upper end of the inclined sliding plate 3 and pushes it along the other end of the scraper groove 11 at a suitable speed for smear preparation. During this process, the bone marrow fluid is evenly spread on the glass slide 2, forming a standard smear with uniform thickness. This embodiment has a simple structure and low cost, making it suitable for students' basic operation practice. The smear pass rate is improved by more than 60% compared to manual operation.

[0043] Example 2

[0044] like Figures 3-12 As shown, this embodiment, based on embodiment 1, focuses on optimizing the disassembly and ease of operation of the fluid storage scraper 4, making it suitable for experimental scenarios requiring frequent replacement of bone marrow fluid.

[0045] The base 1 and the inclined slide plate 3 have the same structure as in embodiment 1. The difference is that the mounting slot 31 of the inclined slide plate 3 has an inner groove 36 that is connected downwards at the bottom. The top of the inner groove 36 has a notch 37 that is adapted to the lug 43 of the liquid storage scraper 4. An elastic spring 38 is installed on the top of the mounting slot 31. The spring 38 is made of spring steel. One end is clamped and fixed through the upper gap of the slot, and the other end is inclined to press against the top surface of the liquid storage scraper 4 to provide continuous downward pressure.

[0046] Liquid storage scraper 4: Adopts a split design, including a base plate 46 and a cover plate 47, both made of PP polypropylene. Recessed holes 48 with a diameter of 0.3cm are formed at the four corners, with neodymium iron boron magnets embedded within each hole 48. The magnets do not protrude from the plate surface, achieving a tight and flat fit between the base plate 46 and the cover plate 47 through magnetic attraction. A groove is formed on the side of the cover plate 47 facing the base plate 46, creating a liquid storage chamber 41 and a liquid inlet 42. A liquid filling port 45 is located at the top of the cover plate 47 for easy liquid filling. The base plate 46 has integrally formed outward-protruding lugs 43 on both sides. An opening groove 39 is formed in the upper part of the mounting slot 31, and the protrusions 44 on the side of the scraper are inserted into the opening groove 39.

[0047] The disassembly and cleaning process in this embodiment is as follows: After the smear is prepared, the operator pushes the protrusion 44 on the side of the liquid storage scraper 4 upward. The protrusion 44 moves upward along the opening groove 39, causing the entire scraper to rise. The lug 43 disengages from the notch 37 of the mounting slot 31, allowing the liquid storage scraper 4 to be removed from the inclined slide plate 3. The bottom plate 46 and the cover plate 47 are separated (overcoming magnetic attraction). The liquid storage tank 41, the liquid drain slit 42, and the bottom surface of the bottom plate 46 are rinsed and disinfected. After drying, they are reassembled for reuse. This embodiment solves the problem of inconvenient cleaning in traditional devices, reducing the cleaning time of a single liquid storage scraper 4 to less than 2 minutes, and avoiding the risk of cross-contamination.

[0048] Example 3:

[0049] like Figure 13-15 As shown, this embodiment, based on embodiment 2, adds an automatic lifting mechanism to further improve the quality of the smear end, making it suitable for high-standard teaching demonstration scenarios.

[0050] Base 1 optimization: An upwardly protruding inclined platform 14 is integrally formed at the end of the retaining edge 12 of the base 1. The height of the inclined platform 14 gradually increases from 0cm to 0.3cm, the slope length is 1.5cm, and the slope faces the other end of the retaining edge 12.

[0051] Inclined slide plate 3 and liquid storage scraper 4: The inner end of the inclined slide plate 3 located on the retaining edge 12 has a notch. After the lug 43 of the liquid storage scraper 4 moves down into place, part of the bottom edge is exposed at the notch. The rest of the structure is the same as in embodiment 2. The downward pressure provided by the elastic spring 38 ensures that the lug 43 can rise smoothly along the slope of the inclined platform 14.

[0052] The automatic lifting process in this embodiment is as follows: When the inclined slide plate moves the liquid-collecting scraper close to the end of the slide, the lugs exposed at the notched corner begin to contact the slope of the platform. As the slide plate continues to slide, the lugs gradually rise along the slope of the platform, causing the liquid-collecting scraper to move upward as a whole, and the elastic spring is compressed. When the slide plate slides to the end of the scraping groove, the bottom surface of the liquid-collecting scraper separates from the surface of the slide, preventing the accumulation of bone marrow fluid at the end of the slide. Furthermore, the separation process allows the end of the smear to form a feather-like structure, eliminating the need for manual control of the lifting action.

Claims

1. An auxiliary device for preparing bone marrow smears, characterized in that... include: The base (1) has a scraper (11) on its top surface for placing a glass slide (2); An inclined sliding plate (3) is movably mounted on a base (1) and can slide horizontally along the length of the scraper groove (11); a downward-opening mounting slot (31) is provided on the inclined surface; The liquid storage scraper (4) includes a liquid storage tank (41) and a liquid drain (42). The liquid storage scraper (4) is installed obliquely in the mounting slot (31) along the inclined surface of the inclined slide plate (3). The bottom surface of the liquid storage scraper (4) is flat and parallel to the groove surface of the scraper groove (11). The liquid drain (42) is arranged along the length of the bottom surface, with its upper end connected to the liquid storage tank (41) and its lower end connected to the bottom surface of the liquid storage scraper (4).

2. The auxiliary device according to claim 1, characterized in that, The base (1) forms a raised edge (12) between the two long sides and the edge of the scraper (11), and a concave groove (13) is provided below the outer side of the edge (12); The bottom inner sides of the inclined slide plate (3) are provided with side slide grooves (32) and side slide blocks (33) that are adapted to the side guard (12) and the slide groove (13) respectively; Both the scraper groove (11) and the slide groove (13) extend to the same end to the outer end of the base (1); The inclined slide (3) extends downward below the lateral slider (33) and is provided with a limit stop (34). A limit pin (35) that can be inserted or pulled out laterally is installed below one end of the groove (13) of the base (1). The limit stop (34) will interfere with the inserted limit pin (35) to achieve the limiting function and prevent slippage.

3. The auxiliary device according to claim 2, characterized in that, The longitudinal length of the mounting slot (31) is greater than the longitudinal length of the liquid storage scraper (4), and the width is adapted to the width of the liquid storage scraper (4). The bottom sides of the liquid storage scraper (4) are provided with outward protruding lugs (43); The lower part of each mounting slot (31) is provided with a downwardly communicating inner groove (36), and a notch (37) adapted to the size of the lug (43) is provided at the top of the inner groove (36), so that the liquid storage scraper (4) can be inserted into the mounting slot (31) through the notch (37), and the lug (43) can slide down along the inner groove (36) to install the liquid storage scraper (4) in the mounting slot (31); An elastic member is installed on the top of the mounting slot (31), and the movable end of the elastic member presses against the top surface of the liquid storage scraper (4) so ​​that the liquid storage scraper (4) continuously provides downward pressure.

4. The auxiliary device according to claim 3, characterized in that, The elastic component is a spring sheet (38), which is integrally formed. After bending, one end is inserted into the upper gap of the mounting slot (31), and the other end provides an elastic force for top support and reset, which acts on the top surface of the liquid storage scraper (4).

5. The auxiliary device according to claim 3, characterized in that, An opening groove (39) is provided in the upper part of the middle of the mounting slot (31). A protrusion (44) that can be inserted into the opening groove (39) is provided on the side of the liquid storage scraper (4). The protrusion (44) can slide up and down along the opening groove (39) to drive the liquid storage scraper (4) to move up in the inner groove (36) so that the liquid storage scraper (4) can be removed and disassembled.

6. The auxiliary device according to claim 3, characterized in that, The inclined slide plate (3) has a notch on the inner side of the part on the sidewall (12). After the lug (43) moves down to the position, part of it is exposed at the notch. An upwardly protruding inclined platform (14) is provided on the end of the sidewall (12), and the slope of the inclined platform (14) faces the other end of the sidewall (12).

7. The auxiliary device according to claim 1, characterized in that, The liquid storage chamber (41) is an upwardly convex cavity with an open top or a liquid filling port (45); the liquid filling slit (42) has a longitudinal cross-sectional shape that gradually widens from bottom to top.

8. The auxiliary device according to claim 1, characterized in that, The bottom surface of the base (1) is provided with an anti-slip pad or a suction cup structure.

9. The auxiliary device according to any one of claims 1-8, characterized in that, The liquid storage scraper (4) is a split design, including a base plate (46) and a cover plate (47). The base plate (46) and the cover plate (47) have corresponding recessed holes (48) at their four corners. Corresponding magnetic suction components are fixedly installed in the recessed holes (48). The contact surfaces of the base plate (46) and the cover plate (47) are parallel to each other. The cover plate (47) has an inwardly recessed groove on the side opposite to the base plate (46). The groove connects the liquid storage tank (41) and the liquid drain slit (42).

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