Longitudinal flow capacity tester for duplex plastic drainage plate

Abstract

The invention discloses a duplex plastic drainage plate longitudinal water flow determinator which comprises a rack, a supporting plate arranged on the rack and a mounting base arranged on the supporting plate, at least two lower mounting grooves are formed in the mounting base, and the supporting plate is provided with a water flow valve communicated with a water guide pipeline. The supporting plate is further provided with a ventilation valve and a water supply valve which are used for being communicated with the pressure container. The pressure container comprises a top plate and a bottom plate with an opening, a sealing structure is arranged between the bottom plate and the supporting plate, the top plate is provided with at least two drainage holes, the inner side of the top plate is provided with at least two upper mounting grooves communicated with the corresponding drainage holes, and plastic drainage plates are mounted in the lower mounting grooves and the upper mounting grooves; the drainage pipes are correspondingly connected with the drainage holes; the pressurizing equipment is connected with the ventilation valve; and the hydraulic gradient applying equipment is connected with the water passing valve. The problems of test errors and low working efficiency caused by environmental factors in a traditional longitudinal water flow two-time parallel test are solved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic drain board longitudinal water throughput detection equipment, in particular to a double plastic drain board longitudinal water throughput measuring instrument. Background Art

[0002] Plastic drainage boards, also known as plastic drainage strips, are geosynthetics composed of a core board and a filter membrane. They serve as drainage materials in foundation reinforcement. Since the 1990s, plastic drainage boards have been widely used in foundation treatment projects and are used in numerous engineering fields, such as water transport, highway, railway, municipal construction, airport construction, urban rail transit, and environmental protection projects. They have played a significant role in human development and urban renewal.

[0003] Longitudinal flow rate is a key technical indicator for plastic drain board products. It reflects the amount of water flowing longitudinally along the board per unit hydraulic gradient and per unit time under a certain lateral pressure. According to relevant specifications (JTS / T 232-2019 and JTS / T 245-2023), the flow rate is measured after 10 minutes of water flow at a lateral pressure of 350 kPa and a hydraulic gradient of 0.5, and the time and temperature are recorded. The test is then repeated every hour until the difference between the two flow rates is less than 5% of the previous flow rate. The final test result is used as the test result, and the average of the two test results is taken as the longitudinal flow rate value for the sample. Existing equipment can only test one plastic drain board at a time, with a maximum of 2-3 measurements. Existing testing has shown that the time it takes for the longitudinal flow rate test to stabilize varies depending on the model of the plastic drain board. The stabilization time for a single test is approximately 2-4 hours or even longer, and the total time for a set of two tests is approximately 4-8 hours or even longer. In addition, the product characteristics of plastic drain boards are highly sensitive to temperature, and water temperature has a great influence on the test results. When the temperature is high, the plastic drain board will become soft, and its plate teeth will fall over under the action of confining pressure, thereby blocking the drainage channel, reducing the water flow rate. When the temperature is low, the plastic drain board will become hard, and its plate teeth will not easily fall over under the action of confining pressure, the drainage channel will be smoother, and the measured water flow rate will be greater than when the temperature is low. Although some specifications introduce a water temperature correction factor to reduce the test error caused by temperature, such as some specifications stipulate that the water temperature should be controlled at (20±2)℃ to ignore the test error caused by the different water temperatures in the two tests, it is actually difficult to eliminate the test error caused by water temperature, which will cause deviations in the final test results. Summary of the Invention

[0004] In view of the defects of the above-mentioned prior art, the present invention provides a double plastic drainage board longitudinal water flow measuring instrument, which has the advantage of being able to test two plastic drainage boards at the same time under the same test environment conditions, thereby eliminating the test error caused by water temperature.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A double plastic drain board longitudinal water flow rate measuring instrument, comprising:

[0007] A frame comprising a support plate and a mounting base disposed on the support plate, the mounting base being provided with at least two lower mounting grooves, the mounting base being provided with a water conduit communicating with the lower mounting grooves, the support plate being provided with a water valve communicating with the water conduit, and the support plate being further provided with a vent valve and a water supply valve for communicating with the pressure vessel;

[0008] A pressure vessel having a plastic drain board placed therein, the pressure vessel comprising a top plate and a bottom plate, the bottom plate being provided with an opening for inserting the mounting base into the pressure vessel, a sealing structure being provided between the bottom plate and the support plate, the pressure vessel being movable up and down relative to the support plate, the top plate being provided with at least two drain holes, the inner side of the top plate being provided with at least two upper mounting grooves, the at least two upper mounting grooves being in one-to-one communication with the at least two drain holes, and the plastic drain board being installed in the lower mounting groove and the upper mounting groove;

[0009] At least two drainage pipes, used for correspondingly connecting to the at least two drainage holes, and the output end of each drainage pipe is connected to a water collector;

[0010] a pressurizing device, configured to be connected to the ventilation valve via a ventilation pipe;

[0011] The hydraulic gradient applying device is used to adjust the hydraulic gradient and is connected to the water valve through a water pipe.

[0012] Furthermore, the output end of the water pipe is provided with a quick-connect plug, and the quick-connect plug is configured to be selectively connected to the water valve or the water supply valve.

[0013] Furthermore, an annular groove is provided on the upper surface of the support plate, a sealing ring is placed in the annular groove, the bottom plate is supported on the upper surface of the support plate and the two are connected by fasteners.

[0014] Furthermore, each drainage pipe is provided with a drainage valve.

[0015] Furthermore, it also includes a lifting device for driving the pressure vessel to rise and fall, and the lifting end of the lifting device is connected to the top plate.

[0016] Furthermore, the lifting equipment includes a pulley assembly and a counterweight assembly, the counterweight assembly includes a counterweight and a steel wire rope, one end of the steel wire rope is wrapped around the pulley assembly and connected to the counterweight, and the other end of the steel wire rope is connected to the top plate.

[0017] Furthermore, the lifting equipment is provided with two groups, the top surface of the top plate is provided with two lifting ears, the two lifting ears are symmetrically arranged, and the lifting ends of the two groups of lifting equipment are detachably connected to the corresponding lifting ears.

[0018] Furthermore, the hydraulic gradient applying equipment includes a hydraulic gradient water tank, the height of the hydraulic gradient water tank is higher than the height of the pressure vessel, a water outlet is provided at the bottom of the hydraulic gradient water tank, and the two ends of the water pipe are respectively connected to the water outlet and the water valve.

[0019] Furthermore, the pressurizing device includes an air chamber and an air compressor, the output end of the air compressor is connected to the input end of the air chamber through a first ventilation pipe, and the output end of the air chamber is connected to the ventilation valve through a second ventilation pipe.

[0020] Furthermore, the top plate is provided with an exhaust hole, an exhaust valve is provided at the exhaust hole, and a pressure gauge capable of displaying the real-time air pressure in the pressure vessel is provided on the top of the top plate.

[0021] Compared with the prior art, the beneficial effects of the present invention include at least:

[0022] The present invention provides at least two lower mounting grooves and at least two upper mounting grooves inside the pressure vessel, so that at least two plastic drain boards can be installed simultaneously in the pressure vessel for testing, thereby ensuring that the environmental conditions of the two parallel tests are completely consistent, eliminating the errors caused by water temperature and instrument errors, reducing test errors, improving test accuracy, and solving the technical problem of test errors caused by environmental factors in two parallel tests of traditional longitudinal water flow; compared with traditional test instruments that can only test one plastic drain board per test, the present invention can detect at least two plastic drain boards at the same time, reducing the test time, and improving the detection efficiency by more than double, solving the problem of low work efficiency that only one plastic drain board can be tested per test.

[0023] In addition, the present invention facilitates the installation of the plastic drain board. Specifically, the lower mounting groove can be fully opened after the pressure vessel is raised to a certain height. The bottom end of the plastic drain board is first inserted into the lower mounting groove, and then the top end of the plastic drain board is pinched to insert it into the upper mounting groove. At the same time, since the top and bottom ends of the plastic drain board are fixed by the mounting groove, the plastic drain board can be prevented from moving freely, ensuring that the waterway is unobstructed, which is conducive to improving the test accuracy. Therefore, the measuring instrument of the present invention also has a simple structure, is easy to use, and facilitates the disassembly and assembly of the plastic drain board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of a double plastic drain board longitudinal water flow rate measuring instrument according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the interior of a pressure vessel according to an embodiment of the present invention;

[0026] Figure 3 yes Figure 1 Cross-sectional view at AA in the middle;

[0027] Figure 4 This is a left side view of a double plastic drain board longitudinal water flow rate measuring instrument according to an embodiment of the present invention;

[0028] In the figure: 1. Frame; 11. Support plate; 12. Mounting base; 121. Lower mounting groove; 13. Water valve; 14. Vent valve; 15. Water supply valve; 2. Pressure vessel; 21. Top plate; 211. Upper mounting groove; 22. Bottom plate; 23. Exhaust valve; 24. Pressure gauge; 3. Plastic drain board; 4. Drain pipe; 5. Drain valve; 6. Water collector; 71. Hydraulic gradient water tank; 72. Water pipe; 81. Air chamber; 82. Air compressor; 83. First ventilation pipe; 84. Second ventilation pipe; 91. Pulley assembly; 92. Counterweight; 93. Wire rope. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated descriptions thereof will be omitted.

[0030] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but can be modified as needed, and all such modifications are within the scope of protection of the present invention.

[0031] like Figure 1-Figure 4 As shown, the double plastic drain board longitudinal water flow meter provided by the present invention includes:

[0032] The frame 1 includes a support plate 11 and a mounting base 12 disposed on the support plate 11. The mounting base 12 is provided with at least two lower mounting grooves 121. A water conduit connecting the lower mounting grooves 121 is provided in the mounting base 12. The support plate 11 is provided with a water valve 13 connected to the water conduit. The support plate 11 is also provided with a ventilation valve 14 and a water supply valve 15 for communicating with the pressure vessel 2.

[0033] A pressure vessel 2 is provided with a plastic drain board 3 therein. The pressure vessel 2 includes a top plate 21 and a bottom plate 22. The bottom plate 22 is provided with an opening for inserting the mounting base 12 into the pressure vessel 2. A sealing structure is provided between the bottom plate 22 and the support plate 11. The pressure vessel 2 can move up and down relative to the support plate 11. The top plate 21 is provided with at least two drainage holes. At least two upper mounting grooves 211 are provided on the inner side of the top plate 21. The at least two upper mounting grooves 211 are connected to the at least two drainage holes in a one-to-one correspondence. The plastic drain board 3 is installed in the lower mounting groove 121 and the upper mounting groove 211.

[0034] At least two drainage pipes 4, used for correspondingly connecting to the at least two drainage holes, and the output end of each drainage pipe 4 is connected to a water collector 6;

[0035] A pressurizing device, used to be connected to the ventilation valve 14 through a ventilation pipe;

[0036] The hydraulic gradient applying device is used to adjust the hydraulic gradient and is connected to the water valve 13 through the water pipe 72.

[0037] In this embodiment, during actual use, the pressure vessel 2 is first lifted to a certain height to expose the lower mounting groove 121, and the bottom end of the plastic drain board 3 wrapped with the latex film is inserted into the lower mounting groove 121, and the lower end of the latex film is stretched to wrap the lower mounting groove 121. Then, the top end of the plastic drain board 3 is inserted into the upper mounting groove 211, and the upper end of the latex film is stretched to wrap the upper mounting groove 211 to complete the installation and fixation of the plastic drain board 3; then the pressure vessel 2 is lowered, the bottom plate 22 and the support plate 11 are locked, the exhaust valve 23 and the water supply valve 15 are opened, the pressure vessel 2 is filled with water, the air in the pressure vessel 2 is discharged, and after the pressure vessel 2 is filled with water, the exhaust valve 23 is tightened and the water supply valve 15 is closed. After connecting the water pipe 72, the ventilation pipe and the drain pipe 4, first start the pressurizing equipment, inflate and pressurize the pressure vessel 2 through the ventilation pipe, and when the air pressure reaches the predetermined value required for the test, close the ventilation valve 14; start the hydraulic gradient applying equipment, and inject water into the plastic drain board 3 through the water pipe 72. The hydraulic gradient applying equipment adjusts the hydraulic gradient size according to the test needs. After a predetermined time of seepage under constant pressure and constant hydraulic gradient, the water flow rate of each plastic drain board 3 can be measured through the water collector 6 until it meets the specification requirements.

[0038] In the present invention, a mounting base 12 is provided on the support plate 11, and at least two lower mounting grooves 121 are provided on the mounting base 12, which cooperate with the upper mounting groove 211 on the inner side of the top plate 21, so that at least two plastic drainage boards 3 can be installed in the pressure vessel 2 at the same time for testing, ensuring that the environmental conditions of the two parallel tests are completely consistent, eliminating the test error and instrument error caused by water temperature, reducing the test error, improving the test accuracy, and solving the technical problem of test error caused by environmental factors in two parallel tests of traditional longitudinal water flow; compared with traditional test instruments that can only test one plastic drainage board 3 per test, the present invention can detect at least two plastic drainage boards 3 at the same time, reducing the test time, and improving the detection efficiency by more than double, solving the technical problem of low work efficiency that only one plastic drainage board 3 can be tested per test.

[0039] In addition, since the pressure vessel 2 can move up and down relative to the support plate 11, the lower mounting groove 121 can be fully opened after the pressure vessel 2 is lifted to a certain height. In this way, the bottom end of the plastic drain board 3 can be first inserted into the lower mounting groove 121, and then the top end of the plastic drain board 3 can be pinched to insert it into the upper mounting groove 211, thereby achieving convenient installation of the plastic drain board 3. At the same time, since the top and bottom ends of the plastic drain board 3 are both fixed by the mounting groove, the plastic drain board 3 can be prevented from moving up and down at will, ensuring smooth water passages and improving test accuracy. At the same time, since the pressure vessel 2 is lifted, the lower mounting groove 121 and the upper mounting groove 211 are both in an open state, making it convenient for the operator to install and remove the plastic drain board 3. Therefore, the measuring instrument of the present invention also has a simple structure, is easy to use, and is convenient for installing and removing the plastic drain board 3.

[0040] As a preferred embodiment, the output end of the water pipe 72 is provided with a quick-connect plug, and the quick-connect plug is configured to be selectively connected to the water valve 13 or the water supply valve 15.

[0041] In this embodiment, when the quick-connect plug of the water pipe 72 is connected to the water supply valve 15, water can be injected into the pressure vessel 2 through the hydraulic gradient applying device. When the quick-connect plug of the water pipe 72 is connected to the water supply valve 13, water is passed to the plastic drainage board 3 through the hydraulic gradient applying device. In this way, the hydraulic gradient applying device can be used as a water supply device, and can also be used to adjust the size of the hydraulic gradient to enhance practicality.

[0042] As a preferred embodiment, an annular groove (not shown) is provided on the upper surface of the support plate 11, a sealing ring is placed in the annular groove, and the bottom plate 22 is supported on the upper surface of the support plate 11 and the two are connected by fasteners.

[0043] In this embodiment, after the plastic drain board 3 is placed in the pressure vessel 2, the pressure vessel 2 is placed on the support plate 11, the bottom plate 22 is in contact with the support plate 11, and then the bottom plate 22 is fastened to the support plate 11 by fasteners. Since a sealing ring is provided between the bottom plate 22 and the support plate 11, the sealing ring can prevent gas and liquid leakage, ensure pressure stability, and enable the normal operation of the pressure vessel 2. Ensure that the pressure vessel 2 has good sealing. The support plate 11 and the bottom plate 22 of the present invention are connected by fasteners and cooperate with the sealing ring, which can maintain the stability of the pressure vessel 2. The connection method of the fasteners is relatively simple and standardized, which is convenient for on-site installation operations. Workers can use common tools (such as wrenches, screwdrivers, etc.) to quickly install the bottom plate 22 and the support plate 11 in place, and can also be easily disassembled when maintenance or replacement of parts is required. Among them, the fasteners are preferably screws.

[0044] As a preferred embodiment, each drain pipe 4 is provided with a drain valve 5. In this way, the drain valve 5 can be controlled to select which plastic drain board 3 to test the water flow rate, so that the two plastic drain boards 3 can be tested in sequence or simultaneously, which is more flexible and practical.

[0045] As a preferred embodiment, a lifting device is further included for driving the pressure vessel 2 to be raised and lowered, and the lifting end of the lifting device is connected to the top plate 21. In this embodiment, the pressure vessel 2 is lifted to a certain height by the lifting device, thereby achieving automatic lifting of the pressure vessel 2 and reducing labor intensity.

[0046] Specifically, the lifting equipment includes a pulley assembly 91 and a counterweight assembly. The counterweight assembly includes a counterweight 92 and a wire rope 93. One end of the wire rope 93 is connected to the counterweight 92 after being wrapped around the pulley assembly 91, and the other end of the wire rope 93 is connected to the top plate 21.

[0047] In this embodiment, the pressure vessel 2 is raised and lowered by means of a counterweight 92 and a steel wire rope 93, thereby conveniently achieving the lifting of the pressure vessel 2 and simplifying the operation. The steel wire rope 93 cooperates with the pulley assembly 91 to make the pressure vessel 2 operate more smoothly. The counterweight 92 is easily replaceable and can be used cumulatively, making operation convenient. In addition, the present invention utilizes the counterweight 92 to achieve the raising and lowering of the pressure vessel 2. Compared with the conventional lifting equipment driven by a motor, the present invention has the characteristics of energy saving and consumption reduction, high safety, and stable operation.

[0048] As a preferred embodiment, the lifting equipment is provided with two groups, the top surface of the top plate 21 is provided with two lifting ears, the two lifting ears are symmetrically arranged, and the lifting ends of the two groups of the lifting equipment are detachably connected to the corresponding lifting ears.

[0049] In this embodiment, two sets of lifting equipment are provided to further improve the stability and safety of the lifting of the pressure vessel 2; preferably, the other end of the wire rope 93 is provided with a hook that cooperates with the lifting lug.

[0050] Of course, in other embodiments, the connection between the steel wire rope 93 and the top plate 21 may also be magnetic, such as providing a suction cup at the other end of the steel wire rope 93 , and the suction cup adsorbing onto the outer top surface of the top plate 21 .

[0051] As a preferred embodiment, the hydraulic gradient applying equipment includes a hydraulic gradient water tank 71, the height of the hydraulic gradient water tank 71 is higher than the height of the pressure vessel 2, and a water outlet is provided at the bottom of the hydraulic gradient water tank 71, and the two ends of the water pipe 72 are respectively connected to the water outlet and the water valve 13.

[0052] In this embodiment, the hydraulic gradient water tank 71 provides different water level gradients to the plastic drain board 3, and the water flow rate of the plastic drain board 3 under different hydraulic gradients can be measured, meeting the requirements of any hydraulic gradient during the water flow test, and being more flexible and practical. The hydraulic gradient water tank 71 is located at a height higher than the height of the pressure vessel 2, and the water level difference between the water level and the height of the top of the plastic drain board 3 forms a water level difference, and the hydraulic gradient can be calculated based on the water level difference. The structure of the hydraulic gradient water tank 71 of the present invention can adopt the patent number CN217738941U, which is named a rapid adjustment head water tank for longitudinal water flow test of plastic drain boards.

[0053] As a preferred embodiment, the pressurizing device includes an air chamber 81 and an air compressor 82, the output end of the air compressor 82 is connected to the input end of the air chamber 81 through a first ventilation pipe 83, and the output end of the air chamber 81 is connected to the ventilation valve 14 through a second ventilation pipe 84.

[0054] In this embodiment, the air compressor 82 is a device for generating compressed air, and the air chamber 81 is used as a centralized air supply. The air chamber 81 and the air compressor 82 are used in combination for pressurization, which has the following effects: it can achieve high efficiency, energy saving and stable air supply, wherein the air compressor 82 can significantly reduce energy consumption through efficient design (such as oil-free technology and intelligent regulation), and the air flow output per unit energy is larger. For example, a dry screw air compressor compresses gas through the rotation of a twin screw, reducing energy loss; a scroll air compressor has higher mechanical efficiency and lower energy consumption because it has no suction and exhaust valves. Pressure buffering is achieved through the air chamber 81, reducing air pressure fluctuations, ensuring the continuity of air supply, and meeting the test's demand for stable air pressure; the use of the air chamber 81 can achieve centralized air supply, so a pressure reducing valve or branch pipeline can be configured according to different pressure requirements, flexibly adapting to multiple scenarios; the air chamber 81 (such as a gas storage tank) can reduce the frequency of gas cylinder replacement, saving procurement and labor costs.

[0055] As a preferred embodiment, the top plate 21 is provided with an exhaust hole, which is equipped with an exhaust valve 23. A pressure gauge 24 capable of displaying the real-time air pressure within the pressure vessel 2 is also provided on the top of the top plate 21. In this embodiment, before testing, the exhaust valve 23 and the water supply valve 15 are opened to fill the pressure vessel 2 with water. The water supply valve 15 and the exhaust valve 23 are then closed. The provision of the exhaust valve 23 facilitates the discharge of air from the pressure vessel 2. The pressure gauge 24 facilitates real-time monitoring of the pressure of the pressure vessel 2. Of course, in other embodiments, a pressure sensor may be provided within the pressure vessel 2 to monitor the pressure of the pressure vessel 2 in real time.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes shall fall within the scope of protection of the claims of the present invention.

Claims

1. A double plastic drainage board longitudinal water flow meter, characterized in that: include: A frame (1) comprises a support plate (11) and a mounting base (12) arranged on the support plate (11); the mounting base (12) is provided with at least two lower mounting grooves (121); a water conduit communicating with each lower mounting groove (121) is provided in the mounting base (12); the support plate (11) is provided with a water valve (13) communicating with the water conduit; the support plate (11) is further provided with a vent valve (14) and a water supply valve (15) for communicating with a pressure vessel (2); A pressure vessel (2) having a plastic drainage board (3) placed therein, the pressure vessel (2) comprising a top plate (21) and a bottom plate (22), the bottom plate (22) being provided with an opening for inserting the mounting base (12) into the pressure vessel (2), a sealing structure being provided between the bottom plate (22) and the support plate (11), the pressure vessel (2) being movable up and down relative to the support plate (11), the top plate (21) being provided with at least two drainage holes, the inner side of the top plate (21) being provided with at least two upper mounting grooves (211), the at least two upper mounting grooves being in one-to-one communication with the at least two drainage holes, the plastic drainage board (3) being installed in the lower mounting groove (121) and the upper mounting groove (211); At least two drainage pipes (4) are used for being connected to the at least two drainage holes in a one-to-one correspondence, and the output end of each drainage pipe (4) is connected to a water collector (6); a pressurizing device, adapted to be connected to the ventilation valve (14) via a ventilation conduit; The hydraulic gradient applying device is used to adjust the hydraulic gradient and is connected to the water valve (13) through a water pipe (72).

2. The double plastic drain board longitudinal water flow measuring instrument according to claim 1, characterized in that: The output end of the water pipe (72) is provided with a quick-connect plug, and the quick-connect plug is configured to be selectively connected to the water valve (13) or the water supply valve (15).

3. The double plastic drainage board longitudinal water flow measuring instrument according to claim 1, characterized in that: An annular groove is provided on the upper surface of the support plate (11), a sealing ring is placed in the annular groove, and the bottom plate (22) is supported on the upper surface of the support plate (11) and the two are connected via fasteners.

4. The double plastic drainage board longitudinal water flow measuring instrument according to claim 1, characterized in that: Each drainage pipe (4) is provided with a drainage valve (5).

5. The double plastic drainage board longitudinal water flow measuring instrument according to claim 1, characterized in that: It also includes a lifting device for driving the pressure vessel (2) to be lifted and lowered, and the lifting end of the lifting device is connected to the top plate (21).

6. The double plastic drain board longitudinal water flow measuring instrument according to claim 5, characterized in that: The lifting device includes a pulley assembly (91) and a counterweight assembly, wherein the counterweight assembly includes a counterweight (92) and a steel wire rope (93), one end of the steel wire rope (93) is connected to the counterweight (92) after being wound around the pulley assembly (91), and the other end of the steel wire rope (93) is connected to the top plate (21).

7. The double plastic drain board longitudinal water flow measuring instrument according to claim 5 or 6, characterized in that: The lifting equipment is provided with two groups, and the top surface of the top plate (21) is provided with two lifting ears, which are symmetrically arranged. The lifting ends of the two groups of lifting equipment are respectively detachably connected to the corresponding lifting ears.

8. The double plastic drain board longitudinal water flow measuring instrument according to claim 1, characterized in that: The hydraulic gradient applying device comprises a hydraulic gradient water tank (71), the hydraulic gradient water tank (71) is located at a height higher than the pressure vessel (2), a water outlet is provided at the bottom of the hydraulic gradient water tank (71), and both ends of the water pipe (72) are respectively connected to the water outlet and the water valve (13).

9. The double plastic drain board longitudinal water flow measuring instrument according to claim 1, characterized in that: The pressurizing device comprises an air chamber (81) and an air compressor (82), wherein the output end of the air compressor (82) is connected to the input end of the air chamber (81) via a first ventilation pipe (83), and the output end of the air chamber (81) is connected to the ventilation valve (14) via a second ventilation pipe (84).

10. The double plastic drain board longitudinal water flow measuring instrument according to claim 1, characterized in that: The top plate (21) is provided with an exhaust hole, and an exhaust valve (23) is provided at the exhaust hole. The top of the top plate (21) is also provided with a pressure gauge (24) capable of displaying the real-time air pressure in the pressure container (2).

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