Movable portable small liquid chromatograph

Abstract

The invention relates to the technical field of liquid chromatographs, in particular to a movable portable small liquid chromatograph which comprises two supporting plates and a bottom plate, the interior of each supporting plate is rotationally connected with a worm, the outer surface of each worm is meshed with two worm gears, and the worm gears are meshed with the bottom plate. The inner wall of each worm gear is fixedly connected with a first rotating rod, four parts such as a worm, the worm gears, a first connecting rod, a second connecting rod and the rotating rods are arranged, the worm rotates to drive the two worm gears to rotate reversely, the worm gears drive the first connecting rods to rotate through the first rotating rods, and displacement of the supporting blocks is achieved through connection of the first connecting rods and the second rotating rods. At the moment, the supporting block drives the second connecting rod to rotate around the fourth rotating rod through the third rotating rod, so that the effect that the supporting block rotates with the first rotating rod and the fourth rotating rod as rotating points is achieved, the wheel sets are driven to move in parallel, the wheel sets are unfolded and make contact with the ground, and the device is jacked up; and the effect that the device is convenient to move by folding and storing the wheel sets is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of liquid chromatographs, and in particular to a portable small liquid chromatograph. Background Art

[0002] Mass spectrometers can analyze complex mixtures and determine the relative content of various components. Through the analysis of mass spectra, various compounds in the sample can be accurately identified, including organic matter, inorganic matter, biological macromolecules, etc. The mass spectrometer can determine the structure and composition of substances through the analysis of mass spectra, which is of great significance for research in chemistry, biology, environment and other fields.

[0003] Existing liquid chromatographs are generally placed on a desktop or workbench, and a series of components are connected in series to first separate the mixture and then analyze and identify it. However, in existing devices, when they need to be moved or relocated, workers need to carry them. Existing devices are not easy to move, and the liquid chromatograph cannot be protected during movement. At the same time, there is a lack of a structure to lift the device, resulting in poor portability.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0005] In order to facilitate movement and protect the liquid chromatograph during movement, thereby improving the portability of the device, the present application provides a movable and portable small liquid chromatograph.

[0006] The present application provides a movable and portable small liquid chromatograph, which adopts the following technical solution: it includes two support plates and a base plate, each of the support plates is rotatably connected to a worm, the outer surface of each worm is meshed with two worm wheels, the inner wall of each worm wheel is fixedly connected to a rotating rod 1, the outer surface of each rotating rod 1 is fixedly connected to a connecting rod 1, the inner wall of each connecting rod 1 is fixedly connected to a rotating rod 2, the outer surface of each rotating rod 2 is rotatably connected to a support block, the inner wall of each support block is rotatably connected to a rotating rod 3, the outer surface of each rotating rod 3 is fixedly connected to a connecting rod 2, the inner wall of each connecting rod 2 is fixedly connected to a rotating rod 4, and the ends of each rotating rod 1 and rotating rod 4 that are close to each other are rotatably connected to the sides of the corresponding support plates that are away from each other.

[0007] Optionally, a sliding pin is slidably connected to the interior of each support block, the bottom end of each sliding pin is fixedly connected to a wheel set, and the upper surface of each wheel set is fixedly connected to damping rods arranged at equal distances.

[0008] Optionally, the top end of each damping rod is fixedly connected to the bottom surface of the corresponding support block, the bottom surface of each support block is fixedly connected to a spring 1, and the bottom end of each spring 1 is fixedly connected to the upper surface of the corresponding wheel set.

[0009] Optionally, the bottom surface of each support plate is fixedly connected to the upper surface of the base plate, the inner top wall of the base plate is fixedly connected to a dual-axis motor, the output shafts at both ends of the dual-axis motor are fixedly connected to bevel gear 1, the outer surface of each bevel gear 1 is meshed with bevel gear 2, and the upper surface of each bevel gear 2 is fixedly connected to the bottom end of the corresponding worm.

[0010] Optionally, the instrument body is placed on the upper surface of the base plate, the upper surface of the instrument body is in contact with a top plate, the bottom surface of the top plate is fixedly connected with equidistantly arranged limit bars, the interior of each limit bar is threadedly connected with equidistantly arranged bolts, and the outer surface of each bolt is threadedly connected to the interior of the base plate.

[0011] Optionally, the upper surface of the top plate is fixedly connected with fixed blocks 1 arranged at equal distances, each of the fixed blocks 1 is rotatably connected to a connecting rod inside, the top of each connecting rod is rotatably connected to a fixed block 2, and two cross bars are provided above the top plate, and the upper surface of each fixed block 2 is fixedly connected to the bottom surface of the corresponding cross bar.

[0012] Optionally, the outer surfaces of the two connecting rods are fixedly connected with triangular blocks, and the upper surface of each triangular block is provided with a limiting groove.

[0013] Optionally, the bottom surface of each cross bar is fixedly connected to a limiting block, a cavity is defined inside each limiting block, and an inner side wall of each cavity is slidably connected to a sliding block.

[0014] Optionally, the bottom surface of each sliding block is fixedly connected to a limit pin, and the outer surface of each limit pin is slidably connected to the inner wall of the corresponding limit slot.

[0015] Optionally, the upper surface of each sliding block is fixedly connected to a second spring arranged at an equal distance, and the top end of each second spring is fixedly connected to the inner top wall of the corresponding cavity.

[0016] In summary, this application has the following beneficial technical effects:

[0017] 1. The present invention is provided with components such as a worm, a worm wheel, a connecting rod 1, a connecting rod 2, and a rotating rod 4. The rotation of the worm drives the two worm wheels to rotate in opposite directions. The worm wheel drives the connecting rod 1 to rotate through the rotating rod 1. The displacement of the support block is achieved through the connection between the connecting rod 1 and the rotating rod 2. At this time, the support block drives the connecting rod 2 to rotate around the rotating rod 4 through the rotating rod 3, thereby achieving the effect of the support block rotating with the rotating rod 1 and the rotating rod 4 as the rotation points, and then drives the wheel set to move parallely, unfold the wheel set, contact the ground, and lift up the device, so that the device can be easily moved by folding and storing the wheel set.

[0018] 2. The present invention sets components such as sliding pins, wheel sets, damping rods, and springs. When the wheel set drives the device to move, the damping rod is installed on the surface of the wheel set, and the top of the damping rod is fixed to the bottom surface of the support block. The sliding pin is placed to limit the wheel set, and the wheel set can move up and down through the connection between the sliding pin and the support block. A spring is placed in the middle to connect the wheel set and the support block. The damping rod and the spring achieve a shock-absorbing effect when the moving surface is uneven, which can better protect the device from bumps and improve the protection of the device.

[0019] When the cam is lifted up, the cam is released, and the cam is released to the stopper, which in turn causes the cam to be retracted and the cam to be moved to the next stop, thereby improving the portability of the cam.

[0020] 4. The present invention sets a bottom plate, a top plate, a limit bar, a bolt and other components, and places the instrument body on the surface of the bottom plate. At this time, moving the top plate drives the limit bar to move, and the instrument body is limited by the four limit bars. The installation bolts are connected to the limit bars and the bottom plate to achieve a fixed installation effect of the limit bars, and then achieve a fixed effect of the top plate, thereby achieving the effect of limiting the instrument body by installing the limit bars and bolts, preventing the instrument body from falling off when moving, making the device more stable when moving, and improving the safety of the device by protecting the instrument body and preventing the four corners of the instrument body from colliding with obstacles such as walls. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the embodiment of the present application;

[0022] Figure 2 This is a structural diagram of the connection relationship between the top plate and the fixing block 1 in an embodiment of the present application;

[0023] Figure 3 This is a structural diagram of the connection relationship between the limit strip and the bolt in the embodiment of the present application;

[0024] Figure 4 This is a structural diagram of the connection relationship between the second fixing block and the connecting rod in an embodiment of the present application;

[0025] Figure 5 This is a structural diagram of the connection relationship between the limiting groove and the limiting pin in an embodiment of the present application;

[0026] Figure 6 This is a structural diagram of the connection relationship between the bevel gear 1 and the bevel gear 2 in the embodiment of the present application;

[0027] Figure 7 is a structural diagram of the connection relationship between the worm and the worm wheel in an embodiment of the present application;

[0028] Figure 8 It is a structural diagram of the connection relationship between the connecting rod 1 and the rotating rod 2 in the embodiment of the present application.

[0029] Figure markings: 1. support plate; 2. worm; 3. worm gear; 4. rotating rod one; 5. connecting rod one; 6. rotating rod two; 7. support block; 8. rotating rod three; 9. connecting rod two; 10. rotating rod four; 11. sliding pin; 12. wheel set; 13. damping rod; 14. spring one; 15. bottom plate; 16. dual-axis motor; 17. bevel gear one; 18. bevel gear two; 19. instrument body; 20. top plate; 21. limit strip; 22. bolt; 23. fixing block one; 24. connecting rod; 25. fixing block two; 26. cross bar; 27. triangular block; 28. limit slot; 29. ​​limit block; 30. cavity; 31. sliding block; 32. limit pin; 33. spring two. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-8 This application is described in further detail.

[0031] The present application discloses a portable small liquid chromatograph. Figure 7 、 Figure 8As shown, it includes two support plates 1 and a base plate 15, the interior of each support plate 1 is rotatably connected to a worm 2, the outer surface of each worm 2 is meshed with two worm wheels 3, the inner wall of each worm wheel 3 is fixedly connected to a rotating rod 4, and the outer surface of each rotating rod 4 is fixedly connected to a connecting rod 5. The worm 2 is positioned by the support plate 1, and the worm wheel 3 is installed to mesh with its worm 2. The reverse rotation effect of the two worm wheels 3 is achieved by the rotation of the worm 2. The rotating rod 4 is installed and fixed to the worm wheel 3. The rotation effect of the rotating rod 4 is achieved by the rotation of the worm wheel 3. The connecting rod 5 is fixed to the rotating rod 4. When the rotating rod 4 rotates, the connecting rod 5 can rotate around the rotating rod 4.

[0032] like Figure 7 、 Figure 8 As shown, the inner wall of each connecting rod 1 5 is fixedly connected with the rotating rod 2 6, the outer surface of each rotating rod 2 6 is rotatably connected with the support block 7, the inner wall of each support block 7 is rotatably connected with the rotating rod 3 8, and the outer surface of each rotating rod 3 8 is fixedly connected with the connecting rod 2 9. The connecting rod 1 5 is connected with the rotating rod 2 6, and the rotation effect of the rotating rod 2 6 is realized through the connecting rod 1 5. The support block 7 is connected with the rotating rod 2 6, and the rotating rod 2 6 is rotatably connected with the support block 7. The rotating rod 3 8 is installed and connected with the support block 7. The rotating rod 3 8 is positioned by the support block 7, and the rotating rod 3 8 and the support block 7 are also set to be rotatably connected. The connecting rod 2 9 is positioned by the rotating rod 3 8, and the connecting rod 2 9 is fixedly connected with the rotating rod 3 8 to realize the movement effect of the connecting rod 2 9.

[0033] like Figure 7 、 Figure 8 As shown, the inner wall of each connecting rod 2 9 is fixedly connected with a rotating rod 4 10, and the end of each rotating rod 1 4 and rotating rod 4 10 that is close to each other is rotatably connected to the side of the corresponding support plate 1 that is away from each other, and the rotating rod 4 10 is connected to the inner wall of the connecting rod 2 9, and the positioning effect of the rotating rod 4 10 is achieved through the connecting rod 2 9, and the rotating rod 1 4 and rotating rod 4 10 are connected to the support plate 1, and the limiting effect of the rotating rod 1 4 and rotating rod 4 10 is achieved through the rotational connection between the rotating rod 1 4 and rotating rod 4 10 and the support plate 1.

[0034] like Figure 7 、 Figure 8As shown, each support block 7 is slidably connected to a sliding pin 11, the bottom end of each sliding pin 11 is fixedly connected to a wheel group 12, and the upper surface of each wheel group 12 is fixedly connected to damping rods 13 arranged at equal distances. The sliding pin 11 is positioned by the support block 7, and the wheel group 12 is connected to the bottom end of the sliding pin 11, and the damping rod 13 is installed on the surface of the wheel group 12, and the top end of the damping rod 13 is fixed to the bottom surface of the support block 7. The wheel group 12 is used to make the device easy to move and improve the sensitivity of the device.

[0035] like Figure 7 、 Figure 8 As shown, the top of each damping rod 13 is fixedly connected to the bottom surface of the corresponding support block 7, and the bottom surface of each support block 7 is fixedly connected to a spring 14. The bottom end of each spring 14 is fixedly connected to the upper surface of the corresponding wheel group 12. The spring 14 is fixed to the bottom surface of the support block 7, and the bottom end of the spring 14 is fixed to the surface of the wheel group 12. When the device moves to an uneven surface, the sliding pin 11 is driven up and down by the rise and fall of the wheel group 12. At this time, the spring 14 is compressed, and the damping rod 13 is compressed. The wheel group 12 is reset by the rebound of the damping rod 13 and the spring 14, and the shock-absorbing effect of the device is achieved, which can better protect the device from bumps and improve the protection of the device.

[0036] like Figure 6 、 Figure 7 、 Figure 8 As shown, the bottom surface of each support plate 1 is fixedly connected to the upper surface of the base plate 15, and the inner top wall of the base plate 15 is fixedly connected to a dual-axis motor 16. The output shafts at both ends of the dual-axis motor 16 are fixedly connected to a bevel gear 17. The support plate 1 is connected to the base plate 15, and the dual-axis motor 16 is fixed to the inner wall of the base plate 15. Both ends of the dual-axis motor 16 have output shafts. The bevel gear 17 is positioned by the output shafts at both ends of the dual-axis motor 16. The dual-axis motor 16 can simultaneously drive the bevel gears 17 at both ends to rotate, thereby realizing the synchronization of the rotation of the bevel gear 17.

[0037] like Figure 6 、 Figure 7 、 Figure 8 As shown, the outer surface of each bevel gear 17 is meshed with a bevel gear 2 18, and the upper surface of each bevel gear 2 18 is fixedly connected to the bottom end of the corresponding worm 2. The bevel gear 2 18 is positioned by the bevel gear 17, and the bevel gear 2 18 is connected to the bottom end of the corresponding worm 2. The rotation effect of the bevel gear 2 18 is achieved through the bevel gear 17, and then the effect of synchronous rotation of the two worms 2 is achieved, ensuring that the corresponding worm wheels 3 can rotate synchronously, thereby driving the wheel set 12 to rise and fall synchronously.

[0038] like Figure 1 、 Figure 2 、 Figure 3 As shown, an instrument body 19 is placed on the upper surface of the bottom plate 15, and the upper surface of the instrument body 19 is in contact with a top plate 20. The bottom surface of the top plate 20 is fixedly connected with equidistantly arranged limit bars 21, and the interior of each limit bar 21 is threadedly connected with equidistantly arranged bolts 22, and the outer surface of each bolt 22 is connected to the internal thread of the bottom plate 15. The instrument body 19 is placed on the surface of the bottom plate 15, and the top plate 20 and the limit bar 21 are installed on the surface of the instrument body 19. The connection between the bolts 22 and the limit bar 21 and the bottom plate 15 is used to achieve a fixing effect on the limit bar 21, and then achieve a limiting effect on the instrument body 19, thereby achieving limiting of the instrument body 19, preventing the instrument body 19 from falling off during movement, making the device more stable during movement, and preventing the four corners of the instrument body 19 from colliding with obstacles such as walls, thereby improving the safety of the device.

[0039] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the upper surface of the top plate 20 is fixedly connected with fixed blocks 1 23 arranged at equal distances, and the interior of each fixed block 1 23 is rotatably connected with a connecting rod 24, and the top of each connecting rod 24 is rotatably connected with a fixed block 25. Two cross bars 26 are provided above the top plate 20, and the upper surface of each fixed block 25 is fixedly connected to the bottom surface of the corresponding cross bar 26. The fixed block 1 23 is positioned by the top plate 20, and the connecting rod 24 is connected to the fixed block 1 23, and the fixed block 25 is installed on the top of the connecting rod 24. Through the rotational connection between the fixed block 1 23, the connecting rod 24 and the fixed block 2 25, and the cross bar 26 is connected to the corresponding fixed block 2 25, the effect of the cross bar 26 being able to rise and fall is achieved, and the cross bar 26 is used to facilitate lifting the device, thereby improving the portability of the device.

[0040] like Figure 4 、 Figure 5 As shown, the outer surfaces of the two connecting rods 24 are fixedly connected to triangular blocks 27, and the upper surface of each triangular block 27 is provided with a limiting groove 28. The triangular block 27 is positioned by the two connecting rods 24, and the limiting groove 28 is provided on the surface of the triangular block 27.

[0041] like Figure 4 、 Figure 5 As shown, the bottom surface of each cross bar 26 is fixedly connected to a limiting block 29, a cavity 30 is opened inside each limiting block 29, and the inner wall of each cavity 30 is slidably connected to a sliding block 31. The limiting block 29 is installed on the bottom surface of the cross bar 26, and the cavity 30 is opened inside it, and the sliding block 31 is placed inside it. The limiting effect of the sliding block 31 is achieved by the contour of the cavity 30.

[0042] like Figure 5 As shown, the bottom surface of each sliding block 31 is fixedly connected to a limit pin 32, and the outer surface of each limit pin 32 is slidably connected to the inner wall of the corresponding limit groove 28, so that the limit pin 32 is fixed to the bottom surface of the sliding block 31, and the movement effect of the limit pin 32 is realized by the movement of the sliding block 31, and the limit pin 32 is connected to the limit groove 28. When the cross bar 26 rises to the highest point, the connection between the limit pin 32 and the limit groove 28 realizes the locking and limiting effect of the cross bar 26 to prevent the cross bar 26 from shaking.

[0043] like Figure 5 As shown, the upper surface of each sliding block 31 is fixedly connected with springs 2 33 arranged at equal distances, and the top of each spring 2 33 is fixedly connected to the inner top wall of the corresponding cavity 30. The spring 2 33 is positioned by the surface of the sliding block 31, and the corresponding spring 2 33 is connected to the inner top wall of the corresponding cavity 30. The elastic force of the spring 2 33 is used to achieve the reset effect of the sliding block 31, and then the reset effect of the limit pin 32 is achieved, thereby ensuring the connection strength between the limit pin 32 and the limit groove 28 when the cross bar 26 is raised, and the movement effect of the sliding block 31 can be achieved through manual operation.

[0044] The implementation principle of a movable and portable small liquid chromatograph in the embodiment of the present application is as follows: the instrument body 19 is placed on the surface of the bottom plate 15, the top plate 20 and the limit bar 21 are placed to limit the instrument body 19, and the bolts 22 are installed to limit the instrument body 19. When the device needs to be lifted, the cross bar 26 is lifted by the rotation connection between the fixing block 1 23, the connecting rod 24 and the fixing block 2 25. At this time, the movement effect of the limit pin 32 is achieved by the slope of the surface of the triangular block 27, and then the limit effect of the cross bar 26 is achieved by the connection between the limit pin 32 and the limit groove 28. The lifting and moving effect of the device is achieved by the cross bar 26. Conversely, pressing the sliding block 31 drives the spring 2 33 to contract, releases the connection between the limit pin 32 and the limit groove 28, and realizes the storage effect of the cross bar 26. When the device needs to be moved, the dual-axis motor 16 drives the bevel gear 1 17 to rotate. The bevel gear 1 17 drives the bevel gear 2 18 to rotate, and the bevel gear 2 18 drives the worm 2 to rotate. The worm 2 drives the two worm gears 3 to rotate in the opposite direction. The worm gear 3 drives the rotating rod 1 4 and the connecting rod 1 5 to rotate, and the connection between the connecting rod 1 5 and the rotating rod 2 6 and the support block 7 drives the support block 7 to move. The support block 7 realizes the movement effect of the connecting rod 2 9 through the connection with the rotating rod 3 8. The connecting rod 2 9 is limited by the rotating rod 4 10, so that the support block 7 can perform the effect of the circulation movement through the connecting rod 1 5 and the connecting rod 2 9, and ensure that the support block 7 can always maintain a horizontal state. The support block 7 drives the wheel group 12 to contact the ground through the sliding pin 11, and lifts the device to achieve the effect that the device can be easily moved. The shock absorption effect of the device is achieved by installing the damping rod 13 and the spring 1 14, which can better protect the device from bumps and improve the protection of the device.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A portable small liquid chromatograph comprising two support plates (1) and a bottom plate (15), characterized in that: The interior of each support plate (1) is rotatably connected to a worm (2), the outer surface of each worm (2) is meshed with two worm wheels (3), the inner wall of each worm wheel (3) is fixedly connected to a rotating rod (4), the outer surface of each rotating rod (4) is fixedly connected to a connecting rod (5), the inner wall of each connecting rod (5) is fixedly connected to a rotating rod (6), the outer surface of each rotating rod (6) is rotatably connected to a support block (7), the inner wall of each support block (7) is rotatably connected to a rotating rod (8), the outer surface of each rotating rod (8) is fixedly connected to a connecting rod (9), the inner wall of each connecting rod (9) is fixedly connected to a rotating rod (4) (10), and the ends of each rotating rod (4) and rotating rod (10) that are close to each other are rotatably connected to the side of the corresponding support plate (1) that is away from each other.

2. The portable small liquid chromatograph according to claim 1, characterized in that: The interior of each support block (7) is slidably connected to a sliding pin (11), the bottom end of each sliding pin (11) is fixedly connected to a wheel group (12), and the upper surface of each wheel group (12) is fixedly connected to damping rods (13) arranged at equal distances.

3. The portable small liquid chromatograph according to claim 2, characterized in that: The top end of each damping rod (13) is fixedly connected to the bottom surface of the corresponding support block (7), the bottom surface of each support block (7) is fixedly connected to a spring (14), and the bottom end of each spring (14) is fixedly connected to the upper surface of the corresponding wheel set (12).

4. The portable small liquid chromatograph according to claim 1, characterized in that: The bottom surface of each support plate (1) is fixedly connected to the upper surface of the base plate (15), the inner top wall of the base plate (15) is fixedly connected to a dual-axis motor (16), the output shafts at both ends of the dual-axis motor (16) are fixedly connected to a bevel gear 1 (17), the outer surface of each bevel gear 1 (17) is meshed with a bevel gear 2 (18), and the upper surface of each bevel gear 2 (18) is fixedly connected to the bottom end of the corresponding worm (2).

5. The portable small liquid chromatograph according to claim 1, characterized in that: An instrument body (19) is placed on the upper surface of the bottom plate (15), and a top plate (20) is in contact with the upper surface of the instrument body (19). The bottom surface of the top plate (20) is fixedly connected with equidistantly arranged limiting strips (21), and the interior of each limiting strip (21) is threadedly connected with equidistantly arranged bolts (22), and the outer surface of each bolt (22) is threadedly connected to the interior of the bottom plate (15).

6. The portable small liquid chromatograph according to claim 5, characterized in that: The upper surface of the top plate (20) is fixedly connected with fixed blocks (23) arranged at equal distances, the interior of each fixed block (23) is rotatably connected with a connecting rod (24), the top end of each connecting rod (24) is rotatably connected with a fixed block (25), and two cross bars (26) are provided above the top plate (20), and the upper surface of each fixed block (25) is fixedly connected to the bottom surface of the corresponding cross bar (26).

7. The portable small liquid chromatograph according to claim 6, characterized in that: The outer surfaces of the two connecting rods (24) are fixedly connected with triangular blocks (27), and the upper surface of each triangular block (27) is provided with a limiting groove (28).

8. The portable small liquid chromatograph according to claim 6, characterized in that: The bottom surface of each cross bar (26) is fixedly connected to a limiting block (29), a cavity (30) is provided inside each limiting block (29), and the inner side wall of each cavity (30) is slidably connected to a sliding block (31).

9. The portable small liquid chromatograph according to claim 8, characterized in that: The bottom surface of each sliding block (31) is fixedly connected to a limiting pin (32), and the outer surface of each limiting pin (32) is slidably connected to the inner wall of the corresponding limiting groove (28).

10. The portable small liquid chromatograph according to claim 8, characterized in that: The upper surface of each sliding block (31) is fixedly connected to springs 2 (33) arranged at equal distances, and the top end of each spring 2 (33) is fixedly connected to the inner top wall of the corresponding cavity (30).

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