New material ground permeability detection device for highway engineering

Abstract

The invention provides a new material ground permeability detection device for highway engineering, and relates to the field of highway engineering. A shade is welded to the top end of the stand column, a miniature lifting motor is installed on the upper side face of the shade, a driving gear is installed on the miniature lifting motor, a supporting water-permeable disc is welded to the outer side face of the stand column, a measuring cylinder adheres to the supporting water-permeable disc, and a liquid level sensor is installed on the measuring cylinder. A threaded push rod is welded to the upper side face of the pressing disc, a push-pull lifting rod is welded to the lower side face of the pressing disc, and a piston ring plate is welded to the bottom end of the push-pull lifting rod. Through the arrangement of a liquid level sensor, a threaded push rod and a rotary drum, the pavement water permeation work of a water body in different simulated air pressure environments is realized, and the detection precision of the water body loss amount is improved; the problems that detection personnel cannot effectively know the actual water level descending height and the air pressure environment applicability of water permeability detection is poor due to the fact that a water level line of a traditional water permeability tester on an inclined road surface is difficult to accurately align with a graduation line of a measuring cylinder are solved.

Description

Technical Field

[0001] The present invention belongs to the field of highway engineering, and more specifically, relates to a new material ground permeability detection device for highway engineering. Background Art

[0002] Highway engineering is a technical activity of planning, designing, constructing, maintaining and managing highways and their ancillary facilities, which is of great significance to transportation, economic development and social life. Currently, to ensure the durability and safety of pavement materials, a water permeability tester is commonly used to evaluate the liquid penetration performance of asphalt and concrete materials in constructed highway pavement areas. During use, the water permeability tester requires water to be injected into a graduated cylinder. The tester then manually opens the valve at the bottom of the cylinder, allowing the water to flow by gravity to the highway pavement material in the test area. The tester then timed and observed the corresponding height between the graduated cylinder scale mark and the water level, thereby determining the amount and rate of liquid penetration in the highway pavement material inspection area. Therefore, it can be seen that traditional water permeability testers require the tester to observe the graduated cylinder scale mark to determine the height of the water level drop. However, during actual road surface inspection, the slope of the highway pavement causes the water level line to deviate from the graduated cylinder scale line, making it difficult for the water level line to be accurately aligned with the graduated cylinder scale line, resulting in the tester being unable to effectively determine the actual water level drop. In addition, traditional water permeability testers rely solely on gravity penetration and cannot effectively simulate the water permeability performance of highway pavements under different air pressurization environments, reducing the applicability of water permeability testing to air pressure environments. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a new material ground permeability detection device for highway engineering, so as to solve the problem that the water level line of the traditional water permeability tester is difficult to accurately align with the scale line of the measuring cylinder on the inclined road surface, resulting in the inability of the tester to effectively know the actual water level drop height and the poor applicability of the air pressure environment for water permeability testing.

[0004] The present invention provides a new material ground permeability detection device for highway engineering, comprising a handle and a base plate; a mask is welded on the lower side of the handle, and a rotating drum is rotatably connected to the center of the mask; a through hole is provided on the upper side of the base plate, and an exhaust valve is provided in the through hole of the base plate; the device also comprises a column and a pressure plate; a mask is welded on the top of the column, a micro-lifting motor is installed on the upper side of the mask, a driving gear is installed on the motor shaft of the micro-lifting motor, the base plate is welded on the bottom end of the column, and a gear is bonded to the lower side of the base plate. A rubber sealing pad, a limiting column is welded on the upper side of the base plate, a supporting water-permeable plate is welded on the outer side of the column, a measuring cylinder is bonded to the upper side of the supporting water-permeable plate, a bracket plate is welded on the outer side of the column, and a control machine and a battery box are installed on the front side of the bracket plate; a threaded push rod is welded on the center position of the upper side of the pressure plate, a push-pull lifting rod is welded on the lower side of the pressure plate, and a piston ring plate is welded on the bottom end of the push-pull lifting rod; a drain valve is installed on the bottom end of the supporting water-permeable plate, and a base plate is installed on the bottom end of the drain valve, and a weight is placed on the upper side of the base plate.

[0005] Furthermore, the rotating drum is a cylindrical barrel structure that passes through from top to bottom. A ring plate is provided on the outer side of the rotating drum near the bottom end. The outer side of the ring plate is provided with an external tooth structure. The driving gear is meshed and connected to the external tooth structure of the ring plate on the outer side of the rotating drum. A threaded structure is provided on the inner side of the cylindrical barrel structure of the rotating drum. The outer side of the threaded push rod is threadedly meshed and connected to the threaded structure on the inner side of the rotating drum.

[0006] Furthermore, the measuring cylinder is a cylindrical cylinder structure with an opening on the lower side. The measuring cylinder is made of transparent acrylic material as a whole. A through hole is provided at the center of the upper side of the measuring cylinder, and a liquid level sensor is installed in the through hole of the measuring cylinder. Eight groups of water injection grooves are provided on the outer side of the measuring cylinder near the top. The water injection grooves of the measuring cylinder are distributed in a circular array around the vertical center axis of the measuring cylinder. Two groups of convex columns are provided on the upper side of the measuring cylinder, and a circular through hole is provided at the center of the upper side of each group of convex columns. Two groups of push-pull lifting rods are inserted into the through holes of the convex columns of the measuring cylinder. A through hole is provided at the center of the upper side of the measuring cylinder, and a liquid level sensor is installed in the through hole of the measuring cylinder.

[0007] Furthermore, the liquid level sensor is a capacitive sensor, the height of the measuring rod of the liquid level sensor is the same as the height of the inner side of the measuring cylinder, and the liquid level sensor is distributed on the inner side of the measuring cylinder.

[0008] Furthermore, the shield is a cylindrical structure with an open lower side, and a flexible solar panel is bonded around the outer side of the shield. A photovoltaic controller is installed on the flexible solar panel, and the photovoltaic controller is connected to the battery box through a wire.

[0009] Furthermore, the outer side of the piston ring plate is wrapped and bonded with a sealing sleeve, and a circular through hole is provided on the piston ring plate, and an air pressure sensor is inserted into the circular through hole of the piston ring plate, and the detection end of the air pressure sensor is located at the bottom of the piston ring plate.

[0010] Furthermore, the number of the weight blocks is two groups, each group of weight blocks has a semicircular arc structure, the upper side of the weight block is provided with a through hole structure, and the limiting column is inserted into the through hole structure of the weight block.

[0011] Furthermore, the sealing sleeve is made of silicone material as a whole, and is an annular groove structure with an open upper side. The outer side of the annular groove structure of the sealing sleeve fits on the inner side of the cylinder structure of the measuring cylinder.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the core link of liquid level measurement in the process of pavement material permeability detection is innovatively optimized. The control machine controls the liquid level sensor through wires to automatically and dynamically measure the liquid level height changes in the water body in the measuring cylinder using capacitive induction measurement. This achieves accurate determination of the loss volume of the water body in the measuring cylinder during the detection time, abandons the traditional manual reading measurement method of visually observing the alignment of the measuring cylinder scale line with the water body, avoids the situation where the manual reading measurement is inaccurate due to the tilt of the road surface, greatly improves the efficiency of pavement material permeability detection, and improves the detection precision and accuracy.

[0013] 2. In the present invention, a micro-lifting motor is used to drive the threaded engagement transmission mechanism formed by the thread on the inner side of the rotating cylinder and the threaded structure on the outer side of the threaded push rod through the driving gear, so that the threaded push rod is driven by the pressure plate to push and pull the piston ring plate welded to the bottom end of the lifting rod to move up and down inside the measuring cylinder, thereby realizing the controllable squeezing or stretching of the air in the measuring cylinder by the piston ring plate, thereby forming different air pressure environments inside the measuring cylinder, allowing the water body in the measuring cylinder to perform road water permeability work under different simulated air pressure environments, thereby improving the comprehensiveness and applicability of the test results, and being able to more realistically reflect the water permeability performance of the road material in different air pressure usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a front structural schematic diagram of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of the present invention when viewed from the side.

[0017] Figure 4 It is a left-side structural schematic diagram of the present invention.

[0018] Figure 5It is a schematic diagram of the rear side cutaway structure of the present invention.

[0019] Figure 6 The present invention Figure 5 Schematic diagram of the enlarged structure of part A in the middle.

[0020] Figure 7 The present invention Figure 5 Schematic diagram of the enlarged structure of part B in the middle.

[0021] Figure 8 It is a front side cutaway structural schematic diagram of the present invention.

[0022] Figure 9 The present invention Figure 8 Schematic diagram of the enlarged structure of part C in the middle.

[0023] Figure 10 It is a block diagram of the electrical appliance principle of the present invention.

[0024] Figure numerals: 1. threaded push rod; 2. micro lifting motor; 3. lifting handle; 4. flexible solar panel; 5. shield; 6. bracket plate; 7. column; 8. supporting water-permeable plate; 9. rubber sealing gasket; 10. weight block; 11. base plate; 12. limit column; 13. drain valve; 14. measuring cylinder; 15. rotating cylinder; 16. pressure plate; 17. push-pull lifting rod; 18. piston ring plate; 19. liquid level sensor; 20. air pressure sensor; 21. sealing sleeve; 22. control machine; 23. photovoltaic controller; 24. exhaust valve; 25. driving gear; 26. battery box. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0026] like Figures 1-10As shown, the present invention provides a new material ground permeability detection device for highway engineering, including a handle 3 and a base plate 11; a mask 5 is welded to the lower side of the handle 3, and a rotating drum 15 is rotatably connected to the center position of the mask 5; a through hole is provided on the upper side of the base plate 11, and an exhaust valve 24 is provided in the through hole of the base plate 11; it also includes a column 7 and a pressure plate 16; the top of the column 7 is welded with the mask 5, and a micro-lifting motor 2 is installed on the upper side of the mask 5, and a driving gear 25 is installed on the motor shaft of the micro-lifting motor 2; the bottom end of the column 7 is welded with the base plate 11, and a rubber seal is bonded to the lower side of the base plate 11. Pad 9, the upper side of the base plate 11 is welded with a limiting column 12, the outer side of the column 7 is welded with a supporting water-permeable plate 8, the upper side of the supporting water-permeable plate 8 is bonded with a measuring cylinder 14, the outer side of the column 7 is welded with a bracket plate 6, and the front side of the bracket plate 6 is installed with a control machine 22 and a battery box 26; a threaded push rod 1 is welded to the center position of the upper side of the pressure plate 16, and a push-pull lifting rod 17 is welded to the lower side of the pressure plate 16, and a piston ring plate 18 is welded to the bottom end of the push-pull lifting rod 17; a drain valve 13 is installed at the bottom end of the supporting water-permeable plate 8, and the bottom end of the drain valve 13 is installed with the base plate 11, and a weight 10 is placed on the upper side of the base plate 11.

[0027] In the embodiment of the present invention, the rotating drum 15 is a cylindrical barrel structure that passes through from top to bottom. A ring plate is provided on the outer side of the rotating drum 15 near the bottom end, and an external tooth structure is provided on the outer side of the ring plate. The driving gear 25 is meshed and connected to the external tooth structure of the ring plate on the outer side of the rotating drum 15. A threaded structure is provided on the inner side of the cylindrical barrel structure of the rotating drum 15. The outer side of the threaded push rod 1 is threadedly meshed and connected to the threaded structure on the inner side of the rotating drum 15. In the process of the micro-lifting motor 2 driving the rotating drum 15 to rotate through the driving gear 25, the rotating drum 15 drives the threaded push rod 1 to move up and down through the thread, so that the threaded push rod 1 drives the piston ring plate 18 to move up and down on the inside of the measuring cylinder 14 through the pressure plate 16 and the push-pull lifting rod 17. The piston ring plate 18 compresses the air pressure in the measuring cylinder 14 to increase the air pressure in the measuring cylinder 14, so as to simulate the water permeability of water on highway pavement materials under different gas pressurization environments.

[0028] In the embodiment of the present invention, the measuring cylinder 14 is a cylindrical cylinder structure with an opening on the lower side. The measuring cylinder 14 is made of a transparent acrylic material. A through hole is provided at the center of the upper side of the measuring cylinder 14. A liquid level sensor 19 is installed in the through hole of the measuring cylinder 14. Eight groups of water injection grooves are provided on the outer side of the measuring cylinder 14 near the top. The water injection grooves of the measuring cylinder 14 are distributed in a circular array around the vertical center axis of the measuring cylinder 14. The test personnel inject water into the measuring cylinder 14 through the water injection grooves for penetration testing. Two groups of convex columns are provided on the upper side of the measuring cylinder 14. Each group of convex columns A circular through hole is provided at the center of the upper side surface, and two sets of push-pull lifting rods 17 are inserted into the convex through holes of the measuring cylinder 14. The measuring cylinder 14 supports and limits the push-pull lifting rod 17, allowing the threaded push rod 1 welded to the upper side surface of the pressure plate 16 at the top of the push-pull lifting rod 17 to move vertically up and down, avoiding the synchronous rotation of the threaded push rod 1 due to friction between the threads during the rotation of the rotating cylinder 15, and ensuring that the threaded push rod 1 pushes the pressure plate 16 to move vertically up and down. A through hole is provided at the center of the upper side surface of the measuring cylinder 14, and a liquid level sensor 19 is installed in the through hole of the measuring cylinder 14.

[0029] In the embodiment of the present invention, the liquid level sensor 19 adopts a capacitive sensor. The height of the measuring rod of the liquid level sensor 19 is the same as the height of the inner side of the measuring cylinder 14. The capacitive sensor detects the liquid level of the water in the measuring cylinder 14 by measuring the change of capacitance at different height positions through the capacitance measuring rod of the liquid level sensor 19 through the difference in the conductive properties of the measured medium. This abandons the traditional measurement method of visually observing the alignment of the scale lines of the measuring cylinder 14 with the water level line, and avoids the situation where the water level line is tilted due to the tilt of the road surface, making it impossible for the inspector to compare the readings.

[0030] In an embodiment of the present invention, the shield 5 is a cylindrical structure with an opening on the lower side. The outer side of the shield 5 is surrounded and bonded with a flexible solar panel 4. A photovoltaic controller 23 is installed on the flexible solar panel 4. The photovoltaic controller 23 is connected to the battery box 26 through a wire. The flexible solar panel 4 receives sunlight from different angles in different directions on the outer side of the shield 5. After the flexible solar panel 4 converts solar energy into electrical energy, it is transported to the battery in the battery box 26 through a wire for storage after current stabilization processing by the photovoltaic controller 23. The battery box 26 supplies power to the control machine 22 through the wire, which not only improves the power endurance of the ground permeability detection device for outdoor highway detection, but also realizes independent energy storage and power supply of the ground permeability detection device, avoiding the carrying and use of an external power supply.

[0031] In the embodiment of the present invention, the outer side surface of the piston ring plate 18 is wrapped and bonded with a sealing sleeve 21, and a circular through hole is provided on the piston ring plate 18 which passes through the piston ring plate 18 from top to bottom. An air pressure sensor 20 is inserted into the circular through hole of the piston ring plate 18, and the detection end of the air pressure sensor 20 is located at the bottom of the piston ring plate 18. When the piston ring plate 18 moves to the bottom side of the water injection groove of the measuring cylinder 14, the gas in the measuring cylinder 14 is gradually compressed, and the air pressure sensor 20 detects the air pressure in the measuring cylinder 14 in real time, so that the air pressure sensor 20 transmits the detected air pressure value to the control machine 22 through the wire. The control machine 22 controls the speed of the micro lifting motor 2 through the wire to ensure that the road water permeability measurement is performed with a constant simulated gas pressure in the measuring cylinder 14.

[0032] In the embodiment of the present invention, there are two groups of weight blocks 10, and each group of weight blocks 10 has a semicircular arc structure. The upper side of the weight block 10 is provided with a through-hole structure. The weight block 10 squeezes the base plate 11 by its own weight, so that the rubber sealing gasket 9 bonded to the lower side of the base plate 11 fits tightly to the surface of the highway pavement material, and the water permeability detection area is surrounded and sealed. The limiting column 12 is inserted into the through-hole structure of the weight block 10. The limiting column 12 provides horizontal limiting support for the weight block 10 to prevent the weight block 10 from sliding out of the base plate 11 by gravity on the inclined road surface, ensuring that the weight block 10 performs stable gravity squeezing on the base plate 11.

[0033] In the embodiment of the present invention, the sealing sleeve 21 is made of silicone material as a whole. The sealing sleeve 21 is an annular groove structure with an opening on the upper side. The outer side of the annular groove structure of the sealing sleeve 21 is attached to the inner side of the cylinder structure of the measuring cylinder 14. The sealing sleeve 21 uses the elastic sealing properties of the silicone material to prevent the air in the sealed area between the piston ring plate 18 and the measuring cylinder 14 from leaking to the upper side of the piston ring plate 18 during the up and down movement of the piston ring plate 18, thereby ensuring the stability of the air pressure in the measuring cylinder 14.

[0034] The specific usage and function of this embodiment are as follows: When the present invention is conducting the penetration test of pavement materials, the base plate 11 is placed on the road pavement material to be tested, and then two sets of weights 10 are placed on the upper side of the base plate 11. At this time, the limit columns 12 welded on the upper side of the base plate 11 are inserted into the through holes of the weights 10, and the rubber sealing gasket 9 bonded on the lower side of the base plate 11 fits tightly on the road surface, surrounding and sealing the water permeability detection area at the center position of the bottom of the base plate 11. Then, water is injected into the measuring cylinder 14 through the water injection groove of the measuring cylinder 14, and then the drain valve 13 is manually opened and the control machine 22 is turned on. At this time, the water in the measuring cylinder 14 flows into the drain valve 13 through the through hole supporting the permeable disc 8 and then flows from the drain port at the bottom of the drain valve 13 and the through hole of the base plate 11 to the road pavement to be tested. The liquid level sensor 19 constantly senses the dynamic changes of the water level inside the measuring cylinder 14, and transmits the water level height data of the control machine 22 during the detection time through the wire to The control machine 22 stores and records the data, and obtains the water loss rate and water loss amount in the measuring cylinder 14 through the change in water level between the start detection time and the end detection time. If the gas pressure in the measuring cylinder 14 needs to be increased, the control machine 22 controls the micro-lifting motor 2 to start through the wire, and the micro-lifting motor 2 drives the driving gear 25 to rotate, and the driving gear 25 drives the rotating cylinder 15 engaged with the outer side to rotate. Since the inner side of the rotating cylinder 15 is threadedly engaged with the threaded structure of the outer side of the threaded push rod 1, the rotating cylinder 15 drives the threaded push rod 1 to push the pressure plate 16 downward. The pressure plate 16 drives the piston ring plate 18 to move downward on the inside of the measuring cylinder 14 through the push-pull lifting rod 17 connected by welding. The piston ring plate 18 moves to the lower side of the water injection groove of the measuring cylinder 14. At this time, the piston ring plate 18 compresses the gas in the measuring cylinder 14 to increase the gas pressure in the measuring cylinder 14, thereby simulating the water permeability rate of the pavement material in the pressurized air environment.

[0035] All of the above components are installed, connected, or configured using common mechanical methods, such as welding, threaded connections, and screw connections. The specific structures, models, and coefficients of all components are proprietary technologies, and any method that can achieve a beneficial effect may be implemented. The micro-lift motor 2, flexible solar panel 4, drain valve 13, liquid level sensor 19, air pressure sensor 20, controller 22, photovoltaic controller 23, and exhaust valve 24 used are all commonly available components. Upon purchase, they require only connection according to the included instruction manual, so further details will not be provided here.

[0036] The technical solutions of the present invention are not limited to the scope of the embodiments of the present invention, and the technical contents not fully described in the present invention are all well-known technologies.

Claims

1. A new material ground permeability detection device for highway engineering, comprising a handle (3) and a base plate (11); a mask (5) is welded to the lower side of the handle (3), and a rotating drum (15) is rotatably connected to the center of the mask (5); a through hole is provided on the upper side of the base plate (11), and an exhaust valve (24) is provided in the through hole of the base plate (11); the characteristics are: The utility model also includes a column (7) and a pressure plate (16); a shield (5) is welded to the top of the column (7); a micro-lifting motor (2) is installed on the upper side of the shield (5); a driving gear (25) is installed on the motor shaft of the micro-lifting motor (2); a base plate (11) is welded to the bottom of the column (7); a rubber sealing gasket (9) is bonded to the lower side of the base plate (11); a limiting column (12) is welded to the upper side of the base plate (11); a supporting water-permeable plate (8) is welded to the outer side of the column (7); a measuring cylinder (14) is bonded to the upper side of the supporting water-permeable plate (8); ), a bracket plate (6) is welded to the outer side of the column (7), and a control machine (22) and a battery box (26) are installed on the front side of the bracket plate (6); a threaded push rod (1) is welded to the center position of the upper side of the pressure plate (16), a push-pull lifting rod (17) is welded to the lower side of the pressure plate (16), and a piston ring plate (18) is welded to the bottom end of the push-pull lifting rod (17); a drain valve (13) is installed at the bottom end of the supporting permeable plate (8), a base plate (11) is installed at the bottom end of the drain valve (13), and a weight block (10) is placed on the upper side of the base plate (11).

2. A device for detecting ground permeability of new materials for highway engineering according to claim 1, characterized in that: The rotating drum (15) is a cylindrical barrel structure that is passed through from top to bottom. A ring plate is provided on the outer side of the rotating drum (15) near the bottom end. The outer side of the ring plate is provided with an external tooth structure. The driving gear (25) is meshed and connected to the outer tooth structure of the ring plate on the outer side of the rotating drum (15). A threaded structure is provided on the inner side of the cylindrical barrel structure of the rotating drum (15). The outer side of the threaded push rod (1) is threadedly meshed and connected to the threaded structure on the inner side of the rotating drum (15).

3. A device for detecting ground permeability of new materials for highway engineering according to claim 1, characterized in that: The measuring cylinder (14) is a cylindrical cylinder structure with an opening on the lower side. The measuring cylinder (14) is made of a transparent acrylic material. A through hole is provided at the center of the upper side of the measuring cylinder (14). A liquid level sensor (19) is installed in the through hole of the measuring cylinder (14). Eight groups of water injection grooves are provided near the top of the outer side of the measuring cylinder (14). The water injection grooves of the measuring cylinder (14) are distributed in a circular array around the vertical center axis of the measuring cylinder (14). Two groups of convex columns are provided on the upper side of the measuring cylinder (14). A circular through hole is provided at the center of the upper side of each group of convex columns. Two groups of push-pull lifting rods (17) are inserted into the through holes of the convex columns of the measuring cylinder (14). A through hole is provided at the center of the upper side of the measuring cylinder (14). A liquid level sensor (19) is installed in the through hole of the measuring cylinder (14).

4. A device for detecting ground permeability of new materials for highway engineering according to claim 3, characterized in that: The liquid level sensor (19) is a capacitive sensor, and the height of the measuring rod of the liquid level sensor (19) is the same as the height of the inner side of the measuring cylinder (14).

5. A device for detecting ground permeability of new materials for highway engineering according to claim 1, characterized in that: The shield (5) is a cylindrical structure with an opening on the lower side. A flexible solar panel (4) is bonded around the outer side of the shield (5). A photovoltaic controller (23) is installed on the flexible solar panel (4). The photovoltaic controller (23) is connected to the battery box (26) via a wire.

6. A device for detecting ground permeability of new materials for highway engineering according to claim 1, characterized in that: The outer side surface of the piston ring plate (18) is wrapped and bonded with a sealing sleeve (21), and a circular through hole is provided on the piston ring plate (18) extending vertically therethrough. An air pressure sensor (20) is inserted into the circular through hole of the piston ring plate (18), and a detection end of the air pressure sensor (20) is located at the bottom of the piston ring plate (18).

7. A device for detecting ground permeability of new materials for highway engineering according to claim 1, characterized in that: The weight blocks (10) are provided in two groups, and each group of weight blocks (10) has a semicircular arc structure. The upper side of the weight blocks (10) is provided with a through-hole structure, and the limiting column (12) is inserted into the through-hole structure of the weight blocks (10).

8. A device for detecting ground permeability of new materials for highway engineering according to claim 6, characterized in that: The sealing sleeve (21) is made of silicone material as a whole. The sealing sleeve (21) is an annular groove structure with an upper side opening. The outer side of the annular groove structure of the sealing sleeve (21) is fitted on the inner side of the cylinder structure of the measuring cylinder (14).

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