Water quality monitoring equipment for water environment pollution prevention and control

Abstract

The utility model relates to the technical field of water environment pollution prevention and control, in particular to water quality monitoring equipment for water environment pollution prevention and control, which comprises a detection rod main body, the detection rod body is formed by splicing a plurality of grading assemblies, the ends of connecting rods in every two adjacent grading assemblies are connected through a threaded sleeve, a piston is located in a liquid suction pipe, a liquid suction pipe and a liquid conveying pipe are installed at the bottom of the liquid suction pipe, and the other end of the liquid conveying pipe is installed on the lower portion of a liquid storage tank. The multiple grading assemblies are spliced according to the detected water depth, during combination, the ends of the connecting rods in every two connected grading assemblies are in threaded connection through the corresponding threaded sleeve, and liquid can be sucked into the liquid suction pipe through the liquid suction pipe; in the downward pushing process of the piston, water in the liquid pumping pipe is injected into the liquid storage tank through the liquid conveying pipe, the effect of adjusting according to the depth of the water is achieved through cooperation, and compared with traditional water quality monitoring equipment, the water quality monitoring device is more convenient to use and wider in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of water environmental pollution prevention and control, in particular to a water quality monitoring device for water environmental pollution prevention and control. Background Technique

[0002] Water quality monitoring refers to the detection of chemical substances in water bodies and water ecosystem. Through the monitoring of water environment, corresponding treatment plans for water pollution control can be made in time, which plays an important role in water environment prevention and control.

[0003] A patent with the publication number of CN 116990087 B discloses a water quality monitoring device for water environmental pollution prevention and control. This water quality monitoring device for water environmental pollution prevention and control includes a sampling ship. A sampling port is opened on the sampling ship. A sampling mechanism for stratified sampling during water quality monitoring is provided on the sampling ship. The sampling mechanism includes a sampling rod slidably connected to the sampling port. A plurality of sampling boxes are connected to the side wall of the sampling rod through a connecting mechanism. The upper and lower ends of each sampling box are rotatably connected with two symmetrically arranged cover plates. Through the water flow impact force during the downward movement of the sampling box, sampling of water quality at different depths is realized. There is no need to use electrical components to open and close the cover plate on the sampling box, thereby improving the stability of sampling water quality at different depths, and further achieving the effect of sampling water bodies at different depths.

[0004] However, since the sampling depth of the existing water quality monitoring device for water environmental pollution prevention and control is fixed and cannot be adjusted according to the depth of the sampled water body, the applicability is poor. Therefore, a water quality monitoring device for water environmental pollution prevention and control is proposed for the above problems. Content of the Utility Model

[0005] In order to make up for the deficiencies of the prior art and solve the problems existing in the prior art, the utility model proposes a water quality monitoring device for water environmental pollution prevention and control.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows: A water quality monitoring device for water environmental pollution prevention and control according to the utility model includes a main detection rod. The main detection rod is composed of a plurality of hierarchical components assembled together. The hierarchical component includes a connecting rod, a threaded sleeve and a liquid extraction component. The liquid extraction component is installed on the connecting rod through a fixing member. Threaded grooves are provided at both ends of the connecting rod. The ends of the connecting rods in adjacent two hierarchical components are connected through a threaded sleeve.

[0007] The liquid extraction assembly includes a liquid extraction pipe, and the liquid extraction pipe is installed on the connecting rod. A hollow shaft is installed at the top of the liquid extraction pipe. A pull rod is arranged inside the hollow shaft. A hole is formed in the liquid extraction pipe, and the bottom end of the pull rod passes through the hole formed in the liquid extraction pipe and is installed with a piston, and the piston is located inside the liquid extraction pipe. A liquid suction pipe and an infusion pipe are installed at the bottom of the liquid extraction pipe. The side of the liquid extraction pipe is installed with a liquid storage tank through a fixing member, and the other end of the infusion pipe is installed at the lower part of the liquid storage tank;

[0008] The main body of the detection rod is equipped with an air pump. The acting end of the air pump is provided with a main-stage air delivery pipe. A hierarchical air delivery pipe is arranged at the top of the hollow shaft, and the other ends of the hierarchical air delivery pipes can be connected to the air pump through joints. The cooperation achieves the function of being able to adjust according to the water depth, and is more convenient to use and has a wider application range compared with traditional water quality monitoring equipment.

[0009] Preferably, a second one-way valve body is installed on the infusion pipe, a first one-way valve body is installed on the liquid suction pipe, a threaded sealing plug is arranged inside the opening at the top of the liquid storage tank through threaded connection, and a pressure relief valve is arranged on the threaded sealing plug. The cooperation achieves the function of pouring out the sampled liquid and ensures the normal progress of the monitoring work.

[0010] Preferably, the other end of the liquid suction pipe is installed with an end housing, and a coarse screen for filtering is arranged inside the end housing. The cooperation achieves the function of filtering and prevents larger particles from entering the equipment and causing blockage.

[0011] Preferably, a cross-shaped support plate is arranged inside the second one-way valve body. A hole is formed through the side of the cross-shaped support plate, and a limiting rod is arranged through the hole. A sealing plate for blocking the pipe opening is installed at one end of the limiting rod. A spring is sleeved on the limiting rod, and the spring is located between the cross-shaped support plate and the sealing plate. A limiting plate for limiting is installed at the other end of the limiting rod. The cooperation achieves the function of blocking the infusion pipe and ensures the normal progress of sampling.

[0012] Preferably, the components inside the first one-way valve body are the same as those arranged in the second one-way valve body, and the sealing plate arranged inside the second one-way valve body installed on the infusion pipe is located at one end close to the liquid extraction pipe, and the sealing plate arranged inside the first one-way valve body installed on the liquid suction pipe is located at one end close to the end housing. The cooperation achieves the function of blocking the liquid suction pipe and ensures the normal progress of sampling.

[0013] Preferably, a handle is arranged on the topmost hierarchical component, and scale lines are arranged vertically and in parallel on the side of the connecting rod. The cooperation achieves the function of facilitating the penetration of the sampling depth and improves the use convenience.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. The utility model combines multiple groups of grading components according to the detected water depth. When combining, the ends of the connecting rods in two adjacent grading components are threadedly connected through a threaded sleeve. The liquid will be sucked into the liquid extraction pipe through the liquid suction pipe. During the downward movement of the piston, the water in the liquid extraction pipe will be injected into the liquid storage tank through the liquid delivery pipe, achieving the function of adjusting according to the water depth. Compared with traditional water quality monitoring equipment, it is more convenient to use and has a wider application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is the first three-dimensional structure schematic diagram;

[0018] Figure 2 is the enlarged schematic diagram of the main structure of the grading component;

[0019] Figure 3 is the enlarged sectional view of the main structure of the liquid extraction component;

[0020] Figure 4 is the enlarged sectional view of the main structure of the one-way conveying component;

[0021] Figure 5 is the enlarged view of area A in the sectional view of the main structure of the one-way conveying component;

[0022] Figure 6 is the enlarged view of area B in the sectional view of the main structure of the one-way conveying component.

[0023] In the figure: 1, main body of the detection rod; 2, grip; 3, connecting rod; 4, liquid extraction component; 5, liquid extraction pipe; 6, hollow shaft; 7, pull rod; 8, grading gas delivery pipe; 9, piston; 10, air pump; 11, main gas delivery pipe; 12, threaded sleeve; 13, liquid suction pipe; 14, first one-way valve body; 15, liquid storage tank; 16, liquid delivery pipe; 17, second one-way valve body; 18, threaded sealing plug; 19, pressure relief valve; 20, scale line; 21, cross-shaped support plate; 22, limiting rod; 23, sealing plate; 24, spring; 25, limiting plate; 26, end shell; 27, coarse screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1-4 As shown, a water quality monitoring device for preventing and controlling water environment pollution includes a main detection rod 1; the main detection rod 1 is composed of a plurality of sets of grading components assembled together. The grading component includes a connecting rod 3, a threaded sleeve 12, and a liquid pumping component 4. The liquid pumping component 4 is installed on the connecting rod 3 through a fixing member. Threaded grooves are provided at both ends of the connecting rod 3, and the ends of the connecting rods 3 in adjacent two sets of grading components are connected by the threaded sleeve 12.

[0026] The liquid pumping component 4 includes a liquid pumping pipe 5, and the liquid pumping pipe 5 is installed on the connecting rod 3. A hollow shaft 6 is installed at the top of the liquid pumping pipe 5. A pull rod 7 is arranged inside the hollow shaft 6. A hole is provided on the liquid pumping pipe 5, and the bottom end of the pull rod 7 passes through the hole provided on the liquid pumping pipe 5 and is installed with a piston 9, and the piston 9 is located inside the liquid pumping pipe 5. A liquid suction pipe 13 and an infusion pipe 16 are installed at the bottom of the liquid pumping pipe 5. The side of the liquid pumping pipe 5 is installed with a liquid storage tank 15 through a fixing member, and the other end of the infusion pipe 16 is installed at the lower part of the liquid storage tank 15.

[0027] The main detection rod 1 is equipped with an air pump 10. A main-stage air delivery pipe 11 is provided at the acting end of the air pump 10. A grading air delivery pipe 8 is provided at the top of the hollow shaft 6, and the other ends of the grading air delivery pipes 8 can be connected to the air pump 10 through connectors.

[0028] During operation, since the sampling depth of existing water quality monitoring equipment for water environmental pollution prevention and control is fixed and cannot be adjusted according to the depth of the sampled water body, the applicability is poor. In this solution, by combining multiple groups of grading components according to the depth of the detected water body, when combining, the ends of the connecting rods 3 in two adjacent grading components can be threadedly connected through the threaded sleeve 12. And connect the grading air delivery pipe 8 in the liquid extraction component 4 to the air pump 10 for installation and use. Insert the combined detection rod body 1 into the water body, and then control the air pump 10 to operate, so that the air pump 10 performs an air extraction operation. When the air pump 10 extracts air, it will extract the air in the hollow shaft 6 of each grading component through the air pump 10 and the grading air delivery pipe 8. And the air pressure in the hollow shaft 6 will decrease as the air pump 10 continuously operates, thereby causing the pull rod 7 to move upward and contract into the hollow shaft 6. After the pull rod 7 contracts into the hollow shaft 6, it will drive the piston 9 to move upward in the liquid extraction pipe 5. And when the piston 9 moves upward in the liquid extraction pipe 5, it will cause the air pressure below the piston 9 in the liquid extraction pipe 5 to decrease. When the pressure in the liquid extraction pipe 5 is less than the bearing capacity of the first one-way valve body 14, the first one-way valve body 14 will open. At this time, the liquid will be sucked into the liquid extraction pipe 5 through the liquid suction pipe 13. When the pressure in the liquid extraction pipe 5 is balanced, the first one-way valve body 14 will close. Then control the air pump 10 to perform a blowing operation. When the air pump 10 blows air, it will deliver the gas to the grading air delivery pipes 8 at all levels through the main air delivery pipe 11 and deliver it to the hollow shafts 6 in the liquid extraction components 4 at all levels through the grading air delivery pipes 8. As the air pump 10 continuously operates, the air pressure in the hollow shafts 6 of the liquid extraction components 4 at all levels will continuously increase. When the air pressure in the hollow shaft 6 increases, it will push the pull rod 7 downward, causing the pull rod 7 to extend downward and be arranged in the liquid extraction pipe 5, and during the extension process, it will push the piston 9 downward. At this time, the water pressure below the piston 9 in the liquid extraction pipe 5 will continuously increase. When the water pressure is greater than the pressure that the second one-way valve body 17 can bear, the second one-way valve body 17 will open, and the first one-way valve body 14 will remain closed. At this time, when the piston 9 is pushed downward, it will inject the water in the liquid extraction pipe 5 into the liquid storage tank 15 through the liquid delivery pipe 16. When the pressure in the liquid extraction pipe 5 is balanced, the second one-way valve body 17 will close, thereby sampling and storing the water body, achieving the function of being able to adjust according to the water body depth, and being more convenient to use and having a wider application range compared with traditional water quality monitoring equipment.

[0029] Please refer to Figures 3-6 As shown, a second one-way valve body 17 is installed on the liquid delivery pipe 16, a first one-way valve body 14 is installed on the liquid suction pipe 13, a threaded sealing plug 18 is provided in the top opening of the liquid storage tank 15 through threaded connection, and a pressure relief valve 19 is provided on the threaded sealing plug 18.

[0030] The other end of the liquid suction pipe 13 is installed with an end housing 26, and a coarse screen 27 for filtering is arranged in the end housing 26.

[0031] During operation, to ensure the normal water sampling of the water quality monitoring equipment in this solution and be able to take out the sampled liquid for detection, in this solution, a threaded sealing plug 18 is arranged in the upper opening of the liquid storage tank 15. After sampling is completed, the sampled water body can be poured out by unscrewing the threaded sealing plug 18. And a pressure relief valve 19 is installed on the threaded sealing plug 18, which can balance the pressure inside after the water body enters the liquid storage tank 15, so as to ensure that the sampled water body can normally enter the liquid storage tank 15. And under the filtration of the coarse screen 27, larger particles can be effectively prevented from entering the equipment and causing blockage, thus achieving the function of water sampling and improving the usability.

[0032] Please refer to Figures 2-5 As shown, a cross-shaped support plate 21 is arranged inside the second one-way valve body 17. A hole is formed through the side of the cross-shaped support plate 21, and a limiting rod 22 is arranged through the hole. A sealing plate 23 for blocking the pipe opening is installed at one end of the limiting rod 22. A spring 24 is sleeved on the limiting rod 22, and the spring 24 is located between the cross-shaped support plate 21 and the sealing plate 23. A limiting plate 25 for limiting is installed at the other end of the limiting rod 22.

[0033] The components inside the first one-way valve body 14 are the same as those of the second one-way valve body 17. And the sealing plate 23 arranged inside the second one-way valve body 17 installed on the infusion pipe 16 is located at one end close to the liquid extraction pipe 5, and the sealing plate 23 arranged inside the first one-way valve body 14 installed on the liquid suction pipe 13 is located at one end close to the end housing 26.

[0034] A handle 2 is arranged on the topmost grading component, and scale lines 20 are arranged vertically and in series on the side of the connecting rod 3.

[0035] During operation, to ensure the normal use of the water quality monitoring equipment in this solution and the normal progress of the sampling work, in this solution, in the initial state, the spring 24 will always push the sealing plate 23 to the side opposite to the cross-shaped support plate 21, causing it to block the opening between the second one-way valve body 17 and the infusion tube 16, and also block the side of the second one-way valve body 17 close to the liquid extraction tube 5. The sealing plate 23 in the first one-way valve body 14 will block the connection opening between the first one-way valve body 14 and the liquid suction tube 13 and be located on the side close to the end housing 26. When the air pressure in the liquid extraction tube 5 decreases, the sealing plate 23 in the second one-way valve body 17 will always block the connection opening between the infusion tube 16 and the second one-way valve body 17. Under the action of the external pressure, the sealing plate 23 in the first one-way valve body 14 will be pushed open by the external water pressure, causing it to leave the connection opening between the first one-way valve body 14 and the liquid suction tube 13, thereby opening the first one-way valve body 14. Conversely, when the pressure in the liquid extraction tube 5 increases, the first one-way valve body 14 will firmly block the connection opening between the first one-way valve body 14 and the liquid suction tube 13 under the action of the pressure, preventing the water in the liquid extraction tube 5 from being discharged through the liquid suction tube 13. The sealing plate 23 in the second one-way valve body 17 will be pushed open under the action of the internal pressure, causing it to leave the connection opening between the second one-way valve body 17 and the infusion tube 16, thereby opening the second one-way valve body 17. This cooperation achieves the function of one-way flow and ensures the normal progress of water sampling.

[0036] Working principle: By assembling multiple sets of grading components according to the detected water depth, when assembling, the ends of the connecting rods 3 in two adjacent grading components are threadedly connected through the threaded sleeve 12. And connect the grading air delivery pipe 8 in the liquid extraction component 4 to the air pump 10 for installation and use. Insert the assembled detection rod main body 1 into the water body, and then control the operation of the air pump 10 to make the air pump 10 perform air extraction operation. When the air pump 10 extracts air, it will extract the air in the hollow shaft 6 of each grading component through the air pump 10 and the grading air delivery pipe 8. The air pressure in the hollow shaft 6 will decrease with the continuous operation of the air pump 10, and then the pull rod 7 will move upward and contract into the hollow shaft 6. After the pull rod 7 contracts into the hollow shaft 6, it will drive the piston 9 to move upward in the liquid extraction pipe 5. When the piston 9 moves upward in the liquid extraction pipe 5, the air pressure below the piston 9 in the liquid extraction pipe 5 will decrease. When the pressure in the liquid extraction pipe 5 is less than the bearing capacity of the first one-way valve body 14, the first one-way valve body 14 will open. At this time, the liquid will be sucked into the liquid extraction pipe 5 through the liquid suction pipe 13. When the pressure in the liquid extraction pipe 5 is balanced, the first one-way valve body 14 will close. Then control the air pump 10 to perform air blowing operation. When the air pump 10 blows air, it will deliver the gas to the grading air delivery pipes 8 at all levels through the main air delivery pipe 11 and deliver it to the hollow shafts 6 in the liquid extraction components 4 at all levels through the grading air delivery pipes 8. With the continuous operation of the air pump 10, the air pressure in the hollow shafts 6 of the liquid extraction components 4 at all levels will continuously increase. When the air pressure in the hollow shaft 6 increases, it will push the pull rod 7 downward, making the pull rod 7 extend downward and be arranged in the liquid extraction pipe 5, and push the piston 9 downward during the extension process. At this time, the water pressure below the piston 9 in the liquid extraction pipe 5 will continuously increase. When the water pressure is greater than the pressure that the second one-way valve body 17 can bear, the second one-way valve body 17 will open, and the first one-way valve body 14 will remain closed. At this time, when the piston 9 moves downward, it will inject the water body in the liquid extraction pipe 5 into the liquid storage tank 15 through the liquid delivery pipe 16. When the pressure in the liquid extraction pipe 5 is balanced, the second one-way valve body 17 will close, thereby achieving the function of sampling and storing the water body. It cooperates to achieve the function of being adjustable according to the water depth, which is more convenient to use and has a wider application range compared with traditional water quality monitoring equipment.

[0037] By setting a threaded sealing plug 18 in the upper opening of the liquid storage tank 15, after sampling is completed, the sampled water body can be poured out by unscrewing the threaded sealing plug 18. And a pressure relief valve 19 is installed on the threaded sealing plug 18, which can balance the pressure in it after the water body enters the liquid storage tank 15, thereby ensuring that the sampled water body can normally enter the liquid storage tank 15. And under the filtration of the coarse screen 27, it can effectively prevent larger particles from entering the equipment and causing blockage. It cooperates to achieve the function of water body sampling and improves the use convenience.

[0038] In the initial state, the spring 24 always pushes the sealing plate 23 towards the side opposite to the cross-shaped support plate 21, causing it to block the opening between the second one-way valve body 17 and the infusion tube 16, and blocking the side of the second one-way valve body 17 close to the liquid extraction tube 5. The sealing plate 23 in the first one-way valve body 14 blocks the connection opening between the first one-way valve body 14 and the liquid suction tube 13 and is located on the side close to the end housing 26. When the air pressure in the liquid extraction tube 5 decreases, the sealing plate 23 in the second one-way valve body 17 always blocks the connection opening between the infusion tube 16 and the second one-way valve body 17. Under the action of the external pressure, the sealing plate 23 in the first one-way valve body 14 is pushed open by the external water pressure, causing it to leave the connection opening between the first one-way valve body 14 and the liquid suction tube 13, thereby opening the first one-way valve body 14. Conversely, when the pressure in the liquid extraction tube 5 increases, the first one-way valve body 14 firmly blocks the connection opening between the first one-way valve body 14 and the liquid suction tube 13 under the action of the pressure, preventing the water in the liquid extraction tube 5 from discharging through the liquid suction tube 13. The sealing plate 23 in the second one-way valve body 17 is pushed open under the action of the internal pressure, causing it to leave the connection opening between the second one-way valve body 17 and the infusion tube 16, thereby opening the second one-way valve body 17. This cooperation achieves the function of one-way flow and ensures the normal progress of water sampling.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A water quality monitoring device for preventing and controlling water environmental pollution, characterized in that: It includes a detection rod main body (1); the detection rod main body (1) is composed of a plurality of sets of grading components assembled together. The grading components include a connecting rod (3), a threaded sleeve (12) and a liquid pumping component (4). The liquid pumping component (4) is installed on the connecting rod (3) through a fixing member. Threaded grooves are provided at both ends of the connecting rod (3), and the ends of the connecting rods (3) in adjacent two sets of grading components are connected through the threaded sleeve (12). The liquid pumping component (4) includes a liquid pumping pipe (5), and the liquid pumping pipe (5) is installed on the connecting rod (3). A hollow shaft (6) is installed at the top of the liquid pumping pipe (5). A pull rod (7) is arranged inside the hollow shaft (6). A hole is provided on the liquid pumping pipe (5), and the bottom end of the pull rod (7) penetrates through the hole provided on the liquid pumping pipe (5) and is installed with a piston (9), and the piston (9) is located inside the liquid pumping pipe (5). A liquid suction pipe (13) and an infusion pipe (16) are installed at the bottom of the liquid pumping pipe (5). A liquid storage tank (15) is installed on the side of the liquid pumping pipe (5) through a fixing member, and the other end of the infusion pipe (16) is installed at the lower part of the liquid storage tank (15). The detection rod main body (1) is equipped with an air pump (10). The acting end of the air pump (10) is provided with a main-stage air delivery pipe (11). A grading air delivery pipe (8) is provided at the top of the hollow shaft (6), and the other ends of the grading air delivery pipes (8) can be connected to the air pump (10) through connectors.

2. The water quality monitoring device for preventing and controlling water environment pollution according to claim 1, wherein: A second one-way valve body (17) is installed on the infusion pipe (16). A first one-way valve body (14) is installed on the liquid suction pipe (13). A threaded sealing plug (18) is arranged inside the top opening of the liquid storage tank (15) through threaded connection. A pressure relief valve (19) is arranged on the threaded sealing plug (18).

3. The water quality monitoring device for preventing and controlling water environment pollution according to claim 2, characterized in that: The other end of the liquid suction pipe (13) is installed with an end housing (26). A coarse screen (27) for filtering is arranged inside the end housing (26).

4. A water quality monitoring device for preventing and controlling water environment pollution according to claim 2, characterized in that: A cross-shaped support plate (21) is arranged inside the second one-way valve body (17). A hole is penetrated through the side of the cross-shaped support plate (21). A limiting rod (22) is penetrated through the hole. One end of the limiting rod (22) is installed with a sealing plate (23) for blocking the pipe opening. A spring (24) is sleeved on the limiting rod (22), and the spring (24) is located between the cross-shaped support plate (21) and the sealing plate (23). The other end of the limiting rod (22) is installed with a limiting plate (25) for limiting.

5. The water quality monitoring device for preventing and controlling water environment pollution according to claim 2, characterized in that: The components inside the first one-way valve body (14) are the same as those arranged in the second one-way valve body (17). And the sealing plate (23) arranged inside the second one-way valve body (17) installed on the infusion pipe (16) is located at one end close to the liquid pumping pipe (5), and the sealing plate (23) arranged inside the first one-way valve body (14) installed on the liquid suction pipe (13) is located at one end close to the end housing (26).

6. The water quality monitoring device for preventing and controlling water environment pollution according to claim 1, characterized in that: A grip (2) is arranged on the topmost grading component. Scale lines (20) are arranged vertically and in parallel on the side of the connecting rod (3).

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