A slide leveling device

Abstract

The application relates to a slide leveling device which comprises a collecting box, a supporting plate, a rotating frame and a placing plate for mounting a slide, the collecting box is provided with an open top end, the supporting plate is detachably connected to the top end of the collecting box, the supporting plate is provided with a plurality of liquid holes, the rotating frame is provided with a rotating shaft, the rotating frame is rotatably connected to the supporting plate through the rotating shaft, the placing plate is connected to the rotating frame, the placing plate is provided with a mounting assembly for limiting the movement of the slide, the supporting plate is provided with an adjusting assembly, the adjusting assembly comprises a level and a driving shaft, the level is connected to the placing plate, the driving shaft is rotatably connected to the supporting plate and connected to the rotating shaft, the supporting plate is provided with a limiting piece for limiting the rotation of the driving shaft, and the supporting plate is provided with a limiting assembly for limiting the rotation of the rotating frame. The application has the effect of improving the tissue imprint staining efficiency on the slide.

Description

Technical Field

[0001] This application relates to the field of tissue printing and staining technology on glass slides, and in particular to a glass slide leveling device. Background Technology

[0002] ROSE testing is a technique used during cell puncture or tissue biopsy to determine the quality of the sample through immediate slide preparation, staining, and interpretation. Its main purpose is to improve the accuracy and reliability of pathological diagnosis in small biopsies, reduce invalid biopsies, and thus optimize the diagnostic and treatment process.

[0003] Before ROSE testing, tissue imprints need to be applied to glass slides and then stained with a staining agent. A common method of slide staining involves inserting several glass slides into a staining agent container, allowing the staining agent in the container to react and bind with the tissue imprints on the slides. After a certain period of time, the surface of the slides is rinsed to wash away the staining agent from other parts of the tissue imprint.

[0004] However, the above method is suitable for batch staining of slides. If individual slides need to be stained, the above method is not applicable because the staining agent in the box needs to be discarded after use and cannot be used for staining other tissue imprints. Staining a single slide using the above method also requires discarding the original dose of staining agent, which is unreliable and extremely wasteful. Therefore, the method of dripping staining agent onto the slide is adopted to stain the tissue imprint. This method is suitable for single slide or small batch staining. However, this method requires controlling the level of the slide in advance to ensure that the staining agent stays on the slide for a period of time. Otherwise, the staining agent is easy to slip and cannot effectively stain the tissue imprint within the reaction time.

[0005] If the examiner holds the slide by hand, it is impossible to stabilize the slide for a certain period of time, and maintaining the slide level is also extremely laborious, which reduces the staining efficiency of the tissue imprint on the slide. Therefore, a device is needed to maintain the slide level so that the staining agent is kept on the slide and reacts with the tissue imprint. Summary of the Invention

[0006] To improve the staining efficiency of tissue imprints on glass slides, this application provides a glass slide leveling device.

[0007] The glass slide leveling device provided in this application adopts the following technical solution: A slide leveling device includes a collection box, a support plate, a rotating frame, and a placement plate for mounting slides. The collection box has an opening at its top. The support plate is detachably connected to the top of the collection box and has several drainage holes. The rotating frame has a rotating shaft and is rotatably connected to the support plate via the rotating shaft. The placement plate is connected to the top of the rotating frame and has a mounting assembly for restricting slide movement. The support plate has an adjustment assembly, which includes a level and a drive shaft. The level is connected to the placement plate, and the drive shaft is rotatably connected to the support plate and connected to the rotating shaft. The support plate has a limiting member for restricting the rotation of the drive shaft and a limiting assembly for restricting the rotation of the rotating frame.

[0008] By adopting the above technical solution, during installation, the slide is placed on the placement plate, and then the slide is restrained by the limiting component. Based on the level indicator, the drive shaft is rotated, causing the rotating frame to rotate until the level indicator shows a horizontal state. Finally, the limiting component is used to restrain the rotation of the rotating shaft, achieving horizontal installation of the slide. First, the slide is installed using the installation component, then the angle of the rotating frame is adjusted using the adjustment component until the placement plate is horizontal. The limiting component then restrains the rotation of the rotating frame to maintain the horizontal state of the placement plate. At this point, staining agent can be dripped onto the slide, allowing sufficient time for the staining agent to react with the tissue imprint. This avoids the step of holding the slide by hand, making staining the slide more convenient, and reduces staining agent waste, improving the staining efficiency of the tissue imprint on the slide.

[0009] Optionally, three rotating frames are arranged on the support plate along the axial direction of the rotating shaft. A linkage assembly is provided between two adjacent rotating shafts. The linkage assembly includes a linkage rod, a plug, a limiting bead, and an ejector spring. The linkage rod is slidably fitted in the first rotating shaft. The plug is connected to the end of the linkage rod. A limiting hole is opened on the plug. The limiting bead and the ejector spring are both disposed in the limiting hole. The ejector spring is located between the limiting bead and the bottom end of the limiting hole. A limiting edge is connected to the opening of the limiting hole to prevent the limiting bead from passing through. A slot is opened at the end of the second rotating shaft. A limiting arc groove is opened in the slot corresponding to the position of the limiting bead. During linkage, the plug is inserted into the slot, and the limiting bead fits into the limiting arc groove. Similarly, the linkage assembly is arranged on the third rotating shaft.

[0010] By adopting the above technical solution, when tissue imprints need to undergo staining reactions in small batches, the linkage rod is pushed to move the insert block until it is inserted into the slot of the second rotating shaft. During this process, the limiting bead abuts against the edge of the slot, causing the limiting bead to sink into the limiting hole until the insert block is fully inserted into the slot. At this time, the limiting bead is partially moved out of the limiting hole by the force of the ejection spring and fits into the limiting arc groove, achieving the linkage effect between the first and second rotating shafts and realizing the synchronous rotation of the two rotating frames.

[0011] Optionally, the mounting assembly includes a mounting post and a pressure frame for applying pressure to the glass slide. The placement plate has several mounting holes, and the mounting post is inserted into the mounting holes. The pressure frame includes a mounting part and a pressure part. The mounting part is connected to the pressure part and is sleeved on the mounting post. During installation, the pressure part presses the glass slide tightly.

[0012] By adopting the above technical solution, when restricting the movement of the slide, the slide is placed on the placement plate, the mounting post is inserted into the mounting frame, and finally, the mounting part is fitted onto the mounting post while the pressure-applying part contacts the slide. Finally, the pressure-applying part is pressed down, causing the mounting part to descend and its inner wall to press against the surface of the mounting post, thereby restricting the movement of the pressure frame and achieving slide installation. Because pressing the pressure-applying part causes the mounting part to rotate at an angle, and the inner wall of the mounting part presses against the surface of the mounting post, the friction between the mounting part and the mounting post is increased.

[0013] Optionally, the placement plate is provided with a placement groove that matches the shape of the glass slide.

[0014] By adopting the above technical solution, the placement groove is used to initially position the glass slide for installation, enabling the glass slide to be quickly positioned and installed, and also facilitating the subsequent installation of components.

[0015] Optionally, the limiting component includes a retaining arc plate, a fixing frame, and a retaining spring. The fixing frame is connected to the support plate. A plurality of sliding rods are connected to the retaining arc plate. The retaining arc plate is slidably fitted onto the fixing frame through the sliding rods. The retaining spring is sleeved on the sliding rods and is located between the retaining arc plate and the fixing frame. A friction pad is connected to the arc surface of the retaining arc plate, and the friction pad abuts against the surface of the rotating shaft.

[0016] By adopting the above technical solution, when restricting the rotation of the frame, the force of the clamping spring pushes the clamping arc plate, causing the friction pad to press against the surface of the rotating shaft, thereby restricting the rotation of the shaft. Through the cooperation of the clamping spring and the clamping arc plate, the rotation of the shaft is restricted by friction, ensuring that the rotating frame remains in the adjusted state when the testing personnel adjust the level of the placement plate, thus facilitating the adjustment of the slide angle.

[0017] Optionally, a fixed plate is connected to the support plate, the drive shaft is rotatably connected to the fixed plate and connected to the rotating shaft through a gear set, and the limiting member is a stabilizing nut, which is threaded onto the drive shaft and abuts against the fixed plate.

[0018] By adopting the above technical solution, the friction between the drive shaft and the fixed plate is increased by tightening the nut against the fixed plate, thereby limiting the rotation of the drive shaft and achieving the effect of locking the rotation of the rotating frame, which further improves the stability of the glass slide in a horizontal state.

[0019] Optionally, the top of the collection box is provided with a placement step, which fits the shape of the support plate.

[0020] By adopting the above technical solution, the support plate can be placed directly on the placement step when installing the support plate, which facilitates the separation operation between the support plate and the collection box, and also facilitates the maintenance of the inside of the collection box.

[0021] Optionally, the support plate has a drainage groove on its surface, the placement plate is located within the drainage groove, the drainage hole is located in the drainage groove, and two drainage ramps are provided on the support plate at positions corresponding to the inside of the drainage groove. The two drainage ramps are arranged opposite each other, with the reference direction being from the middle position of the support plate to both sides, and the height of the drainage ramps gradually decreasing.

[0022] By adopting the above technical solution, after staining tissue slides with the dye, the dye needs to be cleaned. The operator can rotate the rotating frame through the drive shaft to make the dye fall onto the support plate. The dye is guided by the drainage slope into the drainage tank, and then collected in the collection box through the drainage hole for unified treatment, which facilitates the cleaning of the dye.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. During installation, place the slide on the mounting plate, then use the limiting component to hold the slide in place. Based on the level indicator, rotate the drive shaft to rotate the rotating frame until the level indicator shows a horizontal position. Finally, use the limiting component to further restrict the rotation of the shaft, achieving horizontal mounting of the slide. First, use the mounting component to install the slide, then use the adjusting component to adjust the angle of the rotating frame until the mounting plate is horizontal. Next, use the limiting component to restrict the rotation of the rotating frame to maintain the horizontal position of the mounting plate. At this point, staining agent can be dripped onto the slide, allowing sufficient time for the staining agent to react with the tissue imprint. This method avoids the need to hold the slide by hand, making staining the slide more convenient, and also reduces staining agent waste, improving the staining efficiency of the tissue imprint on the slide. 2. When tissue imprints require small-batch staining, push the linkage rod to move the insert block until it is inserted into the slot of the second rotating shaft. During this process, the limiting bead abuts against the edge of the slot, causing the limiting bead to sink into the limiting hole. When the insert block is fully inserted into the slot, the limiting bead is partially moved out of the limiting hole by the force of the ejection spring and fits into the limiting arc groove, achieving the linkage effect between the first and second rotating shafts and realizing the synchronous rotation of the two rotating frames. 3. When restricting the slide movement, place the slide on the placement plate, insert the mounting post into the mounting frame, and finally, while fitting the mounting part onto the mounting post, ensure the pressure-applying part contacts the slide. Press down on the pressure-applying part to lower the mounting part, causing its inner wall to press firmly against the surface of the mounting post, thus restricting the movement of the pressure frame and achieving slide installation. Pressing down on the pressure-applying part causes the mounting part to rotate at an angle, and the inner wall of the mounting part presses firmly against the surface of the mounting post, thereby increasing the friction between the mounting part and the mounting post. 4. When restricting the rotation of the frame, the force of the retaining spring pushes the retaining arc plate, causing the friction pad to press against the surface of the rotating shaft, thereby restricting the rotation of the shaft. Through the cooperation of the retaining spring and the retaining arc plate, the rotation of the shaft is restricted by friction, so that when the inspector adjusts the level of the placement plate, the rotating frame remains in the adjusted state, which facilitates the adjustment of the slide angle. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the glass slide leveling device in the embodiments of this application.

[0025] Figure 2 This application embodiment shows an exploded view illustrating the structure of the collection box and support plate.

[0026] Figure 3 The cross-sectional view used in this application embodiment to illustrate the structure of the adjustment component.

[0027] Figure 4 The exploded view used in this application embodiment to illustrate the cooperation relationship between the linkage rod and the rotating shaft.

[0028] Figure 5 The cross-sectional view used in this application embodiment to illustrate the structure of the linkage component.

[0029] Figure 6 This application provides a schematic diagram of the structure of the limiting component in an embodiment.

[0030] Figure 7 This application provides a schematic diagram of the structure of the installation components in an embodiment.

[0031] Explanation of reference numerals in the attached drawings: 1. Collection box; 11. Placement step; 2. Support plate; 21. Drainage trough; 22. Drainage hole; 23. Drainage slope; 3. Rotating frame; 31. Rotating shaft; 311. Slot; 4. Placement plate; 41. Placement groove; 5. Adjustment assembly; 51. Level; 52. Drive shaft; 521. Limiting component; 6. Linkage assembly; 61. Linkage rod; 62. Insert block; 63. Limiting bead; 64. Ejection spring; 7. Limiting assembly; 71. Pressing arc plate; 711. Sliding rod; 712. Friction pad; 72. Fixing frame; 73. Pressing spring; 8. Mounting assembly; 81. Mounting column; 82. Pressure frame; 821. Mounting part; 822. Pressure part. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-7 This application provides further details.

[0033] This application discloses a glass slide leveling device. (Refer to...) Figure 1 and Figure 2 The slide leveling device includes a collection box 1, a support plate 2, a rotating frame 3, and a placement plate 4. The collection box 1 is a rectangular box with an opening at the top and a placement step 11. The support plate 2 fits onto the placement step 11 and has a drainage groove 21 with several drainage holes 22. Two opposing drainage ramps 23 are located on the support plate 2 within the drainage groove 21. The height of the drainage ramps 23 gradually decreases from the middle to the sides of the support plate 2, with the lowest point of the ramps facing the drainage groove 21.

[0034] Reference Figure 1 and Figure 3 Three rotating frames 3 are arranged along the length of the support plate 2. A rotating shaft 31 is fixedly connected to the bottom of the rotating frame 3. The rotating frame 3 is rotatably connected to the support plate 2 through the rotating shaft 31. The three rotating shafts 31 are coaxially arranged. Placement plates 4 are fixedly connected to the top of the rotating frame 3. All three placement plates 4 are located within the drainage tank 21.

[0035] Reference Figure 1 and Figure 3 An adjustment assembly 5 is provided on the support plate 2 at the position corresponding to the first rotating shaft 31. The adjustment assembly 5 includes a level 51 and a drive shaft 52. The level 51 is embedded in the side of the placement plate 4. A fixed plate is fixedly connected to the support plate 2, and the drive shaft 52 is rotatably connected to the fixed plate. A wheel is fixedly connected to the end of the drive shaft 52, and the drive shaft 52 and the rotating shaft 31 are connected by a gear set. A limiting member 521 is provided on the drive shaft 52. The limiting member 521 is a stabilizing nut, which is threaded onto the drive shaft 52 and abuts against the fixed plate. By abutting against the fixed plate with the limiting member 521, the rotation of the drive shaft 52 is restricted.

[0036] Reference Figure 3 , Figure 4 and Figure 5 A linkage assembly 6 is provided between two adjacent rotating shafts 31. The linkage assembly 6 includes a linkage rod 61, a plug 62, a limiting bead 63, and an ejector spring 64. A through hole is provided in the first rotating shaft 31, and a limiting protrusion is fixedly connected inside the through hole. The linkage rod 61 passes through the through hole and the fixing plate, and slides with the limiting protrusion. The plug 62 is fixedly connected to the end of the linkage rod 61. A limiting hole is vertically opened on the surface of the plug 62, and a limiting edge is fixedly connected to the opening of the limiting hole. The limiting bead 63 and the ejector spring 64 are both located inside the limiting hole. The limiting bead 63 abuts against the limiting edge, and part of it is located outside the limiting hole. The ejector spring 64 is located between the limiting post and the bottom wall of the limiting hole. A slot 311 is opened at the end of the second rotating shaft 31, and a limiting arc groove is opened on the inner wall of the slot 311 at the position corresponding to the limiting bead 63. Similarly, a linkage assembly 6 is provided at the third rotating shaft 31.

[0037] When the linkage is activated, the linkage rod 61 is pushed, which drives the insert block 62 to move until it is inserted into the slot 311 of the second rotating shaft 31. During this process, the limiting bead 63 abuts against the edge of the slot 311 and enters the limiting hole until the insert block 62 is fully inserted into the slot 311. At this time, the limiting post moves in the opposite direction under the force of the ejection spring 64 and fits the limiting arc groove, realizing the linkage effect of the first rotating shaft 31 and the second rotating shaft 31. Similarly, the linkage of the third rotating shaft 31 and the second rotating shaft 31 is set.

[0038] Reference Figure 3 and Figure 6 A limiting component 7 is provided on the support plate 2 at the position corresponding to the rotation shaft 31. The limiting component 7 includes a clamping arc plate 71, a fixing frame 72, and a clamping spring 73. The fixing frame 72 is fixedly connected to the support plate 2. Several sliding rods 711 are fixedly connected to the clamping arc plate 71, and the clamping arc plate 71 slides vertically on the fixing frame 72 through the sliding rods 711. The clamping spring 73 is sleeved on the sliding rods 711 and is located between the clamping arc plate 71 and the fixing frame 72. A friction pad 712 is fixedly connected to the clamping arc plate 71. The friction pad 712 is a rubber pad and is in contact with the surface of the rotation shaft 31.

[0039] When adjusting the level of the placement plate 4, observe the level 51, rotate the wheel to make the drive shaft 52 rotate, which in turn makes the rotating shaft 31 rotate and the rotating frame 3 rotate. At the same time, the force of the clamping spring 73 is applied to the clamping arc plate 71, so that the friction pad 712 is pressed against the rotating shaft 31, thus achieving the effect of maintaining the current state of the rotating frame 3 when adjusting the angle of the rotating frame 3.

[0040] Reference Figure 1 and Figure 7The placement plate 4 has a placement groove 41 that matches the shape of the glass slide. The depth of the placement groove 41 is less than the thickness of the glass slide, and the placement groove 41 is used for initial positioning of the glass slide. The placement plate 4 is provided with a mounting assembly 8, which includes a mounting post 81 and a pressure frame 82. The placement plate 4 has several mounting holes, and the mounting post 81 is inserted into the mounting holes. The pressure frame 82 includes a mounting part 821 and a pressure part 822. The mounting part 821 and the pressure part 822 are integrally formed. The mounting part 821 is sleeved on the mounting post 81, and the pressure part 822 presses the glass slide.

[0041] When installing a glass slide, the slide is placed in the placement groove 41, and then the mounting post 81 is inserted into the mounting hole. The mounting part 821 is then fitted onto the mounting post 81, so that the pressure part 822 contacts the surface of the glass slide. Then, the mounting part 821 is pressed down, and the mounting part 821 descends. The slight deformation of the mounting part 821 presses against the surface of the mounting post 81, thereby restricting the movement of the pressure frame 82 and achieving the effect of restricting the movement of the glass slide.

[0042] The implementation principle of the glass slide leveling device in this embodiment is as follows: A glass slide is placed in the placement groove 41, then the mounting post 81 is inserted into the mounting hole, and the mounting part 821 is fitted onto the mounting post 81. The pressure part 822 presses down on the glass slide, and the mounting part 821 is pressed to apply pressure to the glass slide. Then, the linkage rod 61 is pushed, causing the insert block 62 to move until it is inserted into the slot 311 of the second rotating shaft 31. At this time, the limiting bead 63 fits against the limiting arc groove. The rotating wheel is rotated according to the state of the level 51, causing the rotating shaft 31 to rotate. Meanwhile, the friction pad 712 is pressed against the surface of the rotating shaft 31 until the level 51 is horizontal. The limiting member 521 is rotated to press against the fixed plate to lock the rotating frame 3, thus achieving the process of leveling the slide. Then, the staining agent is dripped onto the slide. After a specified reaction time, the excess staining agent is dropped onto the support plate 2 by rotating the rotating frame 3. It then flows into the drainage trough 21 along the drainage slope 23 and is finally collected in the collection box 1, thus achieving the staining process of tissue imprints on the slide.

[0043] First, use the mounting component 8 to mount the slide, then use the adjusting component 5 to adjust the angle of the rotating frame 3 until the placement plate 4 is horizontal. Then, use the limiting component 7 to limit the rotation of the rotating frame 3 to maintain the horizontal state of the placement plate 4. At this point, the staining agent can be dripped onto the slide, allowing the staining agent sufficient time to stain the tissue imprint. This avoids the step of holding the slide by hand, making the staining slide more convenient, and also reduces the waste of staining agent, improving the staining efficiency of the tissue imprint on the slide.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A glass slide leveling device, characterized in that: The system includes a collection box (1), a support plate (2), a rotating frame (3), and a placement plate (4) for mounting glass slides. The collection box (1) has an opening at its top. The support plate (2) is detachably connected to the top of the collection box (1) and has several drainage holes (22). The rotating frame (3) has a rotating shaft (31) and is rotatably connected to the support plate (2) via the rotating shaft (31). The placement plate (4) is connected to the top of the rotating frame (3) and has a limited... The mounting assembly (8) for moving glass slides has an adjustment assembly (5) on the support plate (2). The adjustment assembly (5) includes a level (51) and a drive shaft (52). The level (51) is connected to the placement plate (4). The drive shaft (52) is rotatably connected to the support plate (2) and connected to the rotation shaft (31). The support plate (2) has a limiting member (521) that restricts the rotation of the drive shaft (52). The support plate (2) also has a limiting assembly (7) that restricts the rotation of the rotating frame (3).

2. The glass slide leveling device according to claim 1, characterized in that: Three rotating frames (3) are arranged on the support plate (2) along the axial direction of the rotating shaft (31). A linkage assembly (6) is arranged between two adjacent rotating shafts (31). The linkage assembly (6) includes a linkage rod (61), a plug (62), a limiting bead (63), and a push-out spring (64). The linkage rod (61) is slidably fitted in the first rotating shaft (31). The plug (62) is connected to the end of the linkage rod (61). The plug (62) has a limiting hole. The limiting bead (63) and the push-out spring (64) are both arranged in the... Inside the limiting hole, the ejector spring (64) is located between the limiting bead (63) and the bottom of the limiting hole. A limiting edge is connected to the opening of the limiting hole to prevent the limiting bead (63) from passing through. The end of the second rotating shaft (31) has a slot (311). The slot (311) has a limiting arc groove at the position corresponding to the limiting bead (63). When linked, the insert block (62) is inserted into the slot (311), and the limiting bead (63) fits into the limiting arc groove. Similarly, the linkage component (6) is set on the third rotating shaft (31).

3. The glass slide leveling device according to claim 1, characterized in that: The mounting assembly (8) includes a mounting post (81) and a pressure frame (82) for applying pressure to the glass slide. The placement plate (4) has several mounting holes. The mounting post (81) is inserted into the mounting holes. The pressure frame (82) includes a mounting part (821) and a pressure part (822). The mounting part (821) is connected to the pressure part (822). The mounting part (821) is sleeved on the mounting post (81). During installation, the pressure part (822) presses the glass slide.

4. The glass slide leveling device according to claim 1, characterized in that: The placement plate (4) is provided with a placement groove (41) that matches the shape of the glass slide.

5. The slide leveling device according to claim 1, characterized in that: The limiting component (7) includes a clamping arc plate (71), a fixing frame (72), and a clamping spring (73). The fixing frame (72) is connected to the support plate (2). A plurality of sliding rods (711) are connected to the clamping arc plate (71). The clamping arc plate (71) slides on the fixing frame (72) through the sliding rods (711). The clamping spring (73) is sleeved on the sliding rods (711) and is located between the clamping arc plate (71) and the fixing frame (72). A friction pad (712) is connected to the arc surface of the clamping arc plate (71). The friction pad (712) abuts against the surface of the rotating shaft (31).

6. The glass slide leveling device according to claim 1, characterized in that: A fixed plate is connected to the support plate (2). The drive shaft (52) is rotatably connected to the fixed plate and is connected to the rotating shaft (31) through a gear set. The limiting member (521) is a stabilizing nut. The limiting member (521) is threaded onto the drive shaft (52) and abuts against the fixed plate.

7. The glass slide leveling device according to claim 1, characterized in that: The top of the collection box (1) is provided with a placement step (11), which fits the shape of the support plate (2).

8. The glass slide leveling device according to claim 7, characterized in that: The support plate (2) has a drainage groove (21) on its surface. The placement plate (4) is located within the drainage groove (21). The drainage hole (22) is located inside the drainage groove (21). Two drainage ramps (23) are provided on the support plate (2) at positions corresponding to the inside of the drainage groove (21). The two drainage ramps (23) are arranged opposite to each other. The reference direction is from the middle position of the support plate (2) to both sides. The height of the drainage ramps (23) gradually decreases.

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