A test device for observing the soil loosening effect of biofertilizer

Abstract

The application belongs to the technical field of soil permeability test, and particularly relates to a test device convenient for observing the soil loosening effect of biological fertilizer, which comprises a support, an outer ring and an inner ring, the inner ring is arranged in the inner range of the outer ring, the outer ring is arranged in the inner range of the support, moving mechanisms are arranged at the four corners of the support, connecting shafts are symmetrically arranged between the upper ends of the outer ring and the inner ring, sleeve pipes are threadedly sleeved on the two connecting shafts, fixing mechanisms are symmetrically arranged on the two sides of the support, the fixing mechanism comprises a threaded inserting rod which is threadedly inserted into the support, and limit plates are symmetrically arranged on the two sides of the support. The threaded inserting rods on the two sides are inserted into the soil through the fixing mechanism, the overall position of the device is fixed, the outer ring and the inner ring are inserted into the soil along with the operation of the knocking mechanism, the installation and fixing operation of the device by the staff is not needed, and more labor parts can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of soil permeability testing technology, and in particular relates to a test device that facilitates the observation of the soil-loosening effect of bio-fertilizer. Background Technology

[0002] Microbial fertilizers contain a large number of beneficial microorganisms. These microorganisms multiply and grow in the soil, decomposing organic matter, releasing nutrients, and producing beneficial substances such as antibiotics and hormones, thereby promoting plant growth. Bio-fertilizers improve soil structure and promote plant growth. The improved soil is suitable for plant growth. The improvement effect can be detected by soil permeability, which is an important means of detecting the effect of soil loosening.

[0003] An existing patent (publication number CN222636024U) discloses a test device for easily observing the soil loosening effect of fertilizer; it includes: at least one cylinder for holding fertilizer and soil, a detachable funnel screen adapted to the opening at the top of the cylinder, and a detachable upper cylinder cover adapted to the opening at the top of the cylinder.

[0004] In existing technologies, when testing the soil loosening effect, staff need to collect soil samples for experiments. Direct soil collection can damage the overall soil structure and affect permeability testing. Alternatively, soil permeability testing can be conducted on-site in the experimental field. The equipment used for the experiment needs to be manually installed by staff, and the water seepage needs to be observed in the experimental field regularly. The entire process is quite cumbersome. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, when testing the soil loosening effect, staff need to collect soil for experiments or go to the experimental field to conduct soil permeability tests. The equipment for the experiment needs to be manually installed by staff, and the water infiltration needs to be observed in the experimental field at regular intervals. The whole operation process is quite cumbersome. Therefore, the present invention proposes an experimental device that facilitates the observation of the soil loosening effect of bio-fertilizer.

[0006] The present invention proposes an experimental device for easy observation of the soil loosening effect of bio-fertilizer, comprising a support, an outer ring and an inner ring, wherein the inner ring is set within the inner range of the outer ring, and the outer ring is set within the inner range of the support. Each of the four corners of the support is provided with a moving mechanism, and connecting shafts are symmetrically inserted between the upper ends of the outer ring and the inner ring, and sleeves are threaded onto the two connecting shafts.

[0007] The bracket is symmetrically provided with fixing mechanisms on both sides. Each fixing mechanism includes a threaded rod threaded into the bracket. Limiting plates are symmetrically installed on both sides of the bracket, and the two limiting plates are slidably connected to both sides of the outer ring, respectively.

[0008] A horizontal plate is snapped onto the inner ring, and two rulers are inserted into the horizontal plate. Two CCD sensors are arranged between the two rulers. A level is installed on the horizontal plate. A recessed part is provided on one side of the bracket. A support rod is fixedly installed in the recessed part. A striking mechanism is slidably installed on the support rod. A cover plate is snapped onto the outer ring. The striking mechanism includes a striking block.

[0009] Preferably, the fixing mechanism further includes a first gear and a second gear. The first gear is rotatably mounted on the bracket, and the threaded rod passes through the first gear. The second gear is also rotatably mounted on the bracket and meshes with the first gear on one side. A second motor is fixedly connected to the lower part of the bracket, and the drive end of the second motor is fixedly connected to the second gear. A limit sleeve is also threaded onto the threaded rod, and the limit sleeve is fixedly connected to the lower surface of the bracket.

[0010] Preferably, both ends of the connecting shaft are threaded with nuts, and both ends of the sleeve abut against the inner wall of the outer ring and the outer surface of the inner ring, respectively.

[0011] Preferably, the upper surface of the inner ring is provided with a first slot, both ends of the horizontal plate are engaged with the first slot, and both ends of the horizontal plate are provided with arcs for limiting the position. One end of the horizontal plate extends to the range between the outer ring and the inner ring. One scale is set inside the inner ring, and the other scale is set in the range between the outer ring and the inner ring. The lower ends of the two scales are fixedly connected with floating blocks. The surface of the scales is provided with graduations. The two CCD sensors are respectively set towards the two scales, and the CCD sensors are provided with wireless modules.

[0012] Preferably, the striking mechanism further includes a slider that slides through the support rod. A fixed shaft is rotatably connected to one side of the slider, and the fixed shaft is fixedly connected to the striking block. A fixed plate is fixedly installed on the slider, and a groove is provided on the side of the fixed plate. A linkage shaft is rotatably connected to the fixed shaft, and the upper end of the linkage shaft is slidably connected to the groove. A convex shaft is provided on one side of the upper end of the linkage shaft. A first motor is fixedly installed on the upper end of the fixed plate, and a pressure plate is fixedly connected to the drive end of the first motor. The pressure plate abuts against the convex shaft, and a slot is provided on the pressure plate near the drive end.

[0013] Preferably, an auxiliary shaft is provided on the side of the slider away from the fixed shaft, and a retaining ring is fixedly connected to the bottom of the slider by an inclined plate, the retaining ring being engaged with the upper end face of the outer ring.

[0014] Preferably, the upper ends of the outer ring and the inner ring are further provided with a second slot, the bottom of the cover plate is provided with a protrusion, the protrusion is engaged in the second slot, and the two ends of the protrusion are also provided with limiting arcs.

[0015] Preferably, ear plates are symmetrically arranged on both sides of the outer ring, and a vertical plate is provided on the limiting plate. The vertical plate is slidably inserted into the ear plates, and a hole is opened on the vertical plate, into which a retaining shaft is inserted.

[0016] Preferably, the moving mechanism includes a roller, the roller is rotatably connected to a support foot via a connector, the support foot is fixedly installed at the bottom of the bracket, and the upper ends of the two support feet are fixedly connected to handles, the rotational surfaces of the roller relative to the connector are perpendicular to each other.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. During the experiment, the device uses a fixing mechanism to insert the threaded rods on both sides into the soil to fix the overall position of the device. As the striking mechanism operates, the striking block continuously strikes the surface of the cover plate, smoothly transmitting pressure downwards, thereby inserting the outer and inner rings into the soil. No personnel are required to install and fix the equipment, which can reduce a lot of labor.

[0019] 2. Once the outer and inner rings are inserted into the soil and preparations are complete, staff can wait for the experimental results. The CCD sensor can detect scale changes in real time via a camera, and the wireless module can remotely transmit the detection data to staff, allowing them to view the experimental data at any time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an experimental device proposed in this invention for facilitating the observation of the soil-loosening effect of bio-fertilizer;

[0021] Figure 2 This is a top view schematic diagram of an experimental device proposed in this invention for facilitating the observation of the soil-loosening effect of bio-fertilizer;

[0022] Figure 3 This is a bottom view of the experimental device proposed in this invention for easily observing the soil-loosening effect of bio-fertilizer;

[0023] Figure 4 A schematic diagram of the installation structure of the bracket, striking mechanism, and cover plate;

[0024] Figure 5 A schematic diagram of the installation structure of the striking mechanism and the cover plate;

[0025] Figure 6 This is a schematic diagram of the striking mechanism;

[0026] Figure 7 This is a schematic diagram of the structure between the inner ring, outer ring, and cover plate.

[0027] Figure 8 This is a schematic diagram of the installation structure of the limit plate, ear plate, and retaining shaft.

[0028] In the diagram: 1. Bracket; 2. Support leg; 3. Handle; 4. Connector; 5. Roller; 6. Threaded rod; 7. First gear; 8. Second motor; 9. Second gear; 10. Recess; 11. Outer ring; 12. Inner ring; 13. Limiting plate; 14. Horizontal plate; 15. Ruler; 16. Support rod; 17. Limiting sleeve; 18. Sleeve; 19. Floating block; 20. CCD sensor; 21. Ear plate; 22. Cover plate; 23. Knocking block; 24. Sliding block; 25. First motor; 26. Slide groove; 27. Linkage shaft; 28. Slot; 29. ​​Pressure plate; 30. Protruding shaft; 31. Fixed shaft; 32. Vertical plate; 33. Fixed plate; 34. Connecting shaft; 35. Protruding strip; 36. Snap shaft; 37. Auxiliary shaft; 38. Snap ring. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Reference Figures 1-8 An experimental device for easily observing the soil loosening effect of bio-fertilizer includes a support 1, an outer ring 11 and an inner ring 12. The inner ring 12 is set within the inner range of the outer ring 11, and the outer ring 11 is set within the inner range of the support 1. A moving mechanism is set at each of the four corners of the support 1. A connecting shaft 34 is symmetrically inserted between the upper ends of the outer ring 11 and the inner ring 12. A sleeve 18 is threaded onto the two connecting shafts 34.

[0031] The bracket 1 is symmetrically provided with fixing mechanisms on both sides. The fixing mechanisms include threaded rods 6 threaded into the bracket 1. Limiting plates 13 are symmetrically installed on both sides of the bracket 1. The two limiting plates 13 are slidably connected to the two sides of the outer ring 11 respectively.

[0032] A horizontal plate 14 is snapped onto the inner ring 12. Two rulers 15 are inserted into the horizontal plate 14. Two CCD sensors 20 are arranged between the two rulers 15. A level is set on the horizontal plate 14. A recessed part 10 is provided on one side of the bracket 1. A support rod 16 is fixedly installed in the recessed part 10. A striking mechanism is slidably installed on the support rod 16. A cover plate 22 is snapped onto the outer ring 11. The striking mechanism includes a striking block 23.

[0033] During the experiment, staff can use the handle 3 to push the device forward. The rollers 5 installed at the bottom of the device can help with the movement. After moving to the designated location in the experimental field, the surface turf at the designated location is cleaned. The threaded rods 6 on both sides are inserted into the soil through the fixing mechanism to fix the overall position of the device. Then, the retaining pins 36 on both sides used to lock the outer ring 11 are removed, so that the outer ring 11 and inner ring 12 are placed on the ground. The cover plate 22 is inserted into its upper end face. The striking mechanism is fitted onto the support rod 16. As the striking mechanism operates, the striking block 23 continuously strikes the surface of the cover plate 22, smoothly transmitting pressure downwards, thereby inserting the outer ring 11 and inner ring 12 into the soil. The lower end faces of the outer ring 11 and inner ring 12 are both inclined, which facilitates insertion. No staff need to perform the installation and fixing operations of the equipment, which can reduce a lot of labor.

[0034] The fixing mechanism also includes a first gear 7 and a second gear 9. The first gear 7 is rotatably mounted on the bracket 1, and the threaded rod 6 is threaded through the first gear 7. The second gear 9 is also rotatably mounted on the bracket 1 and meshes with the first gear 7 on one side. A second motor 8 is fixedly connected to the lower part of the bracket 1. The drive end of the second motor 8 is fixedly connected to the second gear 9. A limiting sleeve 17 is also threaded onto the threaded rod 6 and is fixedly connected to the lower surface of the bracket 1. When the device moves to the observation point, the second motor 8 drives the second gear 9 to rotate through its drive end. The second gear 9 drives the meshing first gear 7 to rotate. The limiting sleeve 17 limits the threaded rod 6. As the first gear 7 rotates, the threaded rod 6 can rotate, and then the threaded rod 6 can rotate downwards. As the threaded rod 6 continues to rotate, it can penetrate into the soil, thereby fixing the device to the soil.

[0035] Both ends of the connecting shaft 34 are threaded with nuts, and both ends of the sleeve 18 abut against the inner wall of the outer ring 11 and the outer surface of the inner ring 12, respectively. The connecting shaft 34 connects the outer ring 11 and the inner ring 12, and the nuts and sleeve 18 at both ends and in the middle restrict the relative position between the outer ring 11 and the inner ring 12, keeping them on the same plane for easy installation and use. At the same time, when disassembling the device, the outer ring 11 and the inner ring 12 inserted into the soil can be pulled out directly by pulling upward through the limiting sleeve 17.

[0036] The upper end face of the inner ring 12 is provided with a first slot. The two ends of the horizontal plate 14 are engaged with the first slot, and both ends of the horizontal plate 14 are provided with arcs for limiting the position. One end of the horizontal plate 14 extends to the range between the outer ring 11 and the inner ring 12. One scale 15 is set inside the inner ring 12, and the other scale 15 is set in the range between the outer ring 11 and the inner ring 12. The lower ends of the two scales 15 are fixedly connected with floating blocks 19. The surface of the scales 15 is provided with scales. Two CCD sensors 20 are respectively set facing the two scales 15. A wireless module is provided on the CCD sensor 20. When in use, the horizontal plate 14 is inserted into the inner ring 12, and the float 19 floats on the liquid surface. As the water level drops, the scale 15 will slide down accordingly. One scale 15 is used to detect the water level in the inner ring 12, and the other scale 15 is used to detect the water level between the outer ring 11 and the inner ring 12. The CCD sensor 20 can observe the changes in the scale, and the scale change information can be transmitted to the staff through the wireless module, so that the staff can observe remotely.

[0037] The striking mechanism also includes a slider 24, which slides through the support rod 16. A fixed shaft 31 is rotatably connected to one side of the slider 24. The fixed shaft 31 is fixedly connected to the striking block 23. A fixed plate 33 is fixedly installed on the slider 24. A groove 26 is provided on the side of the fixed plate 33. A linkage shaft 27 is rotatably connected to the fixed shaft 31. The upper end of the linkage shaft 27 is slidably connected to the groove 26. A convex shaft 30 is provided on one side of the upper end of the linkage shaft 27. A first motor 25 is fixedly installed on the upper end of the fixed plate 33. A pressure plate 29 is fixedly connected to the drive end of the first motor 25. The pressure plate 29 abuts against the convex shaft 30. A slot 28 is provided on the pressure plate 29 near the drive end. When the first motor 25 drives the pressure plate 29 to rotate via the drive end, it will press against the convex shaft 30. The convex shaft 30 is restricted by the sliding groove 26 and moves upward under the pressure, thereby pulling the upper end of the linkage shaft 27 to slide upward relative to the sliding groove 26. The movement of the linkage shaft 27 will pull the fixed shaft 31, causing the knocking block 23 to rise. The pressure plate 29 continues to rotate, causing the convex shaft 30 to approach and coincide with the slot 28. The convex shaft 30 will disengage from the pressure plate 29 at the slot 28. The linkage shaft 27, which has lost its pressure force, will suddenly fall, which in turn causes the knocking block 23 to suddenly fall. The knocking block 23 can then strike the surface of the cover plate 22. By continuously striking the cover plate 22, the outer ring 11 and the inner ring 12 are continuously pressed down into the soil, thus enabling the experiment to be conducted.

[0038] An auxiliary shaft 37 is provided on the side of the slider 24 away from the fixed shaft 31. A retaining ring 38 is fixedly connected to the bottom of the slider 24 via a slant plate, and the retaining ring 38 is engaged with the upper end face of the outer ring 11. During use, the operator can easily hold the entire striking mechanism through the auxiliary shaft 37. The retaining ring 38 is engaged with the outer ring 11 as a fulcrum, so that the striking mechanism can always be located in a position relatively above the outer ring 11.

[0039] The upper ends of the outer ring 11 and the inner ring 12 are also provided with a second slot. The bottom of the cover plate 22 is provided with a protrusion 35, which is engaged in the second slot. Both ends of the protrusion 35 are also provided with arc-shaped features for limiting movement. The cover plate 22 is engaged with the outer ring 11 and the inner ring 12 by the protrusion 35, and the arc-shaped features limit the ends to prevent back-and-forth sliding.

[0040] The outer ring 11 has symmetrically arranged ear plates 21 on both sides, and a vertical plate 32 is provided on the limiting plate 13. The vertical plate 32 is slidably inserted into the ear plate 21, and a hole is opened in the vertical plate 32, into which a retaining shaft 36 is inserted. When moving this device, the retaining shaft 36 is engaged in the hole below the ear plate 21, thereby lifting the entire outer ring 11 and inner ring 12 to a higher position, and moving simultaneously with the moving bracket 1.

[0041] The moving mechanism includes rollers 5, which are rotatably connected to legs 2 via connectors 4. Legs 2 are fixedly mounted on the bottom of the bracket 1. Handles 3 are fixedly connected to the upper ends of the two legs 2. The rotational surfaces of the rollers 5 relative to the connectors 4 are perpendicular to the rotational surfaces of the legs 2 relative to the connectors 4. Since the rollers 5 and connectors 4 are rotatably connected, and the connectors 4 and handles 3 are also rotatably connected, and their rotational surfaces are perpendicular, the user can move the device freely by holding the handles 3 during use.

[0042] After the outer ring 11 and inner ring 12 are inserted into the soil, the cover plate 22 and the tapping mechanism are removed. Water is poured into both the outer ring 11 and inner ring 12, keeping the water levels inside and outside the rings the same. A horizontal plate 14 is set up on the inner ring 12, and a scale 15 is inserted into the horizontal plate 14. The water level inside and outside the rings can be determined by the scale of the scale 15. The level on the horizontal plate 14 is used to check whether the outer ring 11 and inner ring 12 are stable. After the preparation is completed, the staff can wait for the experimental results. The CCD sensor 20 can detect the scale changes in real time through the camera. At the same time, the wireless module can remotely transmit the detection data to the staff, so that the staff can check the experimental data at any time.

[0043] When the fixing mechanism is in operation, the second motor 8 drives the second gear 9 to rotate through the drive end, and the second gear 9 drives the first gear 7 to rotate. The threaded rod 6 is restricted by the limiting sleeve 17 and can rotate with the rotation of the first gear 7. The continuously rotating threaded rod 6 can be effectively inserted into the soil, thereby effectively fixing the entire device of the bracket 1.

[0044] When installing the outer ring 11 and inner ring 12, the slider 24 is inserted into the support rod 16, and the knocking block 23 is aligned with the center of the cover plate 22. The first motor 25 drives the pressure plate 29 to rotate through the drive end. When the pressure plate 29 rotates, it squeezes the convex shaft 30, causing the convex shaft 30 to drive the upper end of the linkage shaft 27 to move upward relative to the slide groove 26. Thus, the linkage shaft 27 can pull the fixed shaft 31 to rotate relative to the slider 24, so that the fixed shaft 31 can lift the knocking block 23. When the convex shaft 30 moves up to the slot 28 position, it will disengage, and then the knocking block 23 will finally fall off. The knocking block 23 falls repeatedly to knock on the cover plate 22, causing the outer ring 11 and inner ring 12 to penetrate into the soil. With continuous automatic knocking, the outer ring 11 and inner ring 12 are effectively installed, realizing the function of automatic installation, especially in soils with high hardness, it can be installed quickly.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A test device for easily observing the soil-loosening effect of bio-fertilizer, characterized in that, It includes a bracket (1), an outer ring (11) and an inner ring (12). The inner ring (12) is located inside the outer ring (11), and the outer ring (11) is located inside the bracket (1). The bracket (1) is provided with a moving mechanism at each of its four corners. A connecting shaft (34) is symmetrically inserted between the upper ends of the outer ring (11) and the inner ring (12). A sleeve (18) is threaded onto the two connecting shafts (34). The bracket (1) is symmetrically provided with fixing mechanisms on both sides. The fixing mechanisms include threaded rods (6) threaded into the bracket (1). Limiting plates (13) are symmetrically installed on both sides of the bracket (1). The two limiting plates (13) are slidably connected to both sides of the outer ring (11). A horizontal plate (14) is snapped onto the inner ring (12), and two rulers (15) are inserted into the horizontal plate (14). Two CCD sensors (20) are arranged between the two rulers (15). A level is arranged on the horizontal plate (14). A recessed part (10) is provided on one side of the bracket (1). A support rod (16) is fixedly installed in the recessed part (10). A striking mechanism is slidably installed on the support rod (16). A cover plate (22) is snapped onto the outer ring (11). The striking mechanism includes a striking block (23). The fixing mechanism also includes a first gear (7) and a second gear (9). The first gear (7) is rotatably mounted on the bracket (1), and the threaded rod (6) is threaded through the first gear (7). The second gear (9) is also rotatably mounted on the bracket (1) and meshed on one side of the first gear (7). A second motor (8) is fixedly connected to the bottom of the bracket (1). The drive end of the second motor (8) is fixedly connected to the second gear (9). A limit sleeve (17) is also threaded onto the threaded rod (6), and the limit sleeve (17) is fixedly connected to the lower surface of the bracket (1). The striking mechanism also includes a slider (24), which slides through the support rod (16). A fixed shaft (31) is rotatably connected to one side of the slider (24). The fixed shaft (31) is fixedly connected to the striking block (23). A fixed plate (33) is fixedly installed on the slider (24). A groove (26) is provided on the side of the fixed plate (33). A linkage shaft (27) is rotatably connected to the fixed shaft (31). The upper end of the linkage shaft (27) is slidably connected to the groove (26). A convex shaft (30) is provided on one side of the upper end of the linkage shaft (27). A first motor (25) is fixedly installed on the upper end of the fixed plate (33). A pressure plate (29) is fixedly connected to the driving end of the first motor (25). The pressure plate (29) abuts against the convex shaft (30). A slot (28) is opened on the pressure plate (29) near the driving end.

2. The experimental device for easily observing the soil-loosening effect of bio-fertilizer according to claim 1, characterized in that, Both ends of the connecting shaft (34) are threaded with nuts, and both ends of the sleeve (18) abut against the inner wall of the outer ring (11) and the outer surface of the inner ring (12), respectively.

3. The experimental device for easily observing the soil-loosening effect of bio-fertilizer according to claim 1, characterized in that, The upper surface of the inner ring (12) is provided with a first slot. The two ends of the horizontal plate (14) are engaged in the first slot. Both ends of the horizontal plate (14) are provided with arcs for limiting the position. One end of the horizontal plate (14) extends to the range between the outer ring (11) and the inner ring (12). One scale (15) is set inside the inner ring (12), and the other scale (15) is set in the range between the outer ring (11) and the inner ring (12). The lower ends of the two scales (15) are fixedly connected with floating blocks (19). The surface of the scale (15) is provided with scales. The two CCD sensors (20) are respectively set towards the two scales (15). The CCD sensors (20) are provided with wireless modules.

4. The experimental device for easily observing the soil-loosening effect of bio-fertilizer according to claim 1, characterized in that, An auxiliary shaft (37) is provided on the side of the slider (24) away from the fixed shaft (31). A retaining ring (38) is fixedly connected to the bottom of the slider (24) by an inclined plate. The retaining ring (38) is engaged with the upper end face of the outer ring (11).

5. The experimental device for easily observing the soil-loosening effect of bio-fertilizer according to claim 1, characterized in that, The upper ends of the outer ring (11) and the inner ring (12) are also provided with a second slot. The bottom of the cover plate (22) is provided with a protrusion (35), which is engaged in the second slot. Both ends of the protrusion (35) are also provided with a limiting arc.

6. The experimental device for easily observing the soil-loosening effect of bio-fertilizer according to claim 1, characterized in that, The outer ring (11) is symmetrically provided with ear plates (21) on both sides, and a vertical plate (32) is provided on the limiting plate (13). The vertical plate (32) is slidably inserted into the ear plate (21). A hole is opened on the vertical plate (32), and a retaining shaft (36) is inserted into the hole.

7. The experimental device for easily observing the soil-loosening effect of bio-fertilizer according to claim 1, characterized in that, The moving mechanism includes a roller (5), which is rotatably connected to a support leg (2) via a connector (4). The support leg (2) is fixedly installed at the bottom of the bracket (1). A handle (3) is fixedly connected to the upper end of the two support legs (2). The rotation surface of the roller (5) relative to the connector (4) is perpendicular to the rotation surface of the support leg (2) relative to the connector (4).

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