Weighing platform for weighing lysimeter

Abstract

The invention discloses a weighing platform for a weighing lysimeter, and relates to the field of weighing equipment, the weighing platform comprises a stress platform, and also comprises a supporting mechanism which is located below the stress platform and comprises a fixed part which is fixedly arranged and a movable part which is assembled on the fixed part in a lifting manner, the lifting stroke of the movable part is provided with a bearing position which upwards extends out of the fixed part and bears the stress platform, and is also provided with a release position which descends to the lower part of the top surface of the fixed part; the force measurement sensor is located below the stress platform, the top of the force measurement sensor is provided with a detection end face used for bearing the stress platform, and the detection end face is located above the top face of the fixed part so that the stress platform can fall on the detection end face when the movable part descends; and the reciprocating driving mechanism is connected with the movable part so as to drive the movable part to reciprocate between the bearing position and the releasing position. And the phenomena of zero drift and measurement creep of the force transducer during long-term stress monitoring are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of weighing equipment, and in particular to a weighing platform for a weighing lysimeter. Background Art

[0002] Lysimeter is an instrument used to measure soil water evaporation, transpiration and infiltration, and is widely used in agriculture, hydrology, environmental science and other fields. It helps researchers understand processes such as water balance, nutrient cycling and pollutant migration by simulating the soil-plant-atmosphere system under natural conditions. The types of lysimeters mainly include weighing lysimeter, non-weighing lysimeter, hydraulic lysimeter and tension lysimeter.

[0003] Among them, the weighing lysimeter uses a high-precision weighing sensor to monitor the weight changes of the soil-plant system in real time and calculate the water evaporation and transpiration. The advantage is that the data is highly accurate and can be monitored in real time, which is suitable for accurate research on water balance and evapotranspiration processes.

[0004] Prior art, such as a Chinese invention patent with the announcement authorization number CN105865965B, discloses an underground weighing lysimeter suitable for rice fields, including a lysimeter body and a monitoring well, wherein the lysimeter body and the monitoring well are connected via a collection corridor; the lysimeter body includes an outer cylinder and an inner cylinder, wherein a gap is provided between the outer wall of the inner cylinder and the inner wall of the outer cylinder, a weighing sensor is provided at the bottom of the outer cylinder, and the inner cylinder is placed on the weighing sensor.

[0005] In the weighing type lysimeter in the prior art, the weighing sensor and the container containing the test object always maintain a state of contact and force. Under the condition of long-term force, this type of weighing sensor will experience zero point drift and measurement creep, thereby affecting the accuracy and stability of the measurement. Long-term creep will also reduce the service life of the weighing sensor. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a weighing platform for a weighing-type lysimeter to solve the problems of zero drift and measurement creep occurring in the existing weighing sensors during long-term force monitoring, thereby affecting the measurement accuracy and stability and reducing the service life of the weighing sensors.

[0007] The present invention provides the following technical solutions: A weighing platform for a weighing lysimeter, comprising a force-bearing platform and further comprising: The supporting mechanism is located below the force-bearing platform and includes a fixed portion arranged in a fixed manner and a movable portion which is lifted and assembled on the fixed portion. The lifting stroke of the movable portion includes a supporting position extending upward from the fixed portion and supporting the force-bearing platform, and a releasing position descending to below the top surface of the fixed portion. A force sensor is located below the force-bearing platform, and the top of the force sensor has a detection end surface for supporting the force-bearing platform, and the detection end surface is located above the top surface of the fixed part, so that the force-bearing platform falls on the detection end surface when the movable part descends; The reciprocating driving mechanism is connected with the movable part to drive the movable part to move reciprocally between the supporting position and the releasing position.

[0008] Beneficial effects: The reciprocating drive mechanism drives the movable part of the supporting mechanism to rise and fall. When the movable part is in the supporting position, the force platform is separated from the force sensor, and the force sensor is not subjected to force. When the reciprocating drive mechanism drives the movable part of the supporting mechanism to descend, the force platform falls on the force sensor, and the force sensor measures the weight of the force platform. The weighing platform of the present invention can separate and combine the force platform and the force sensor according to the movement frequency, thereby avoiding the zero drift and measurement creep phenomenon that occur in the force sensor during long-term force monitoring, thereby improving the accuracy and stability of the measurement, and further extending the service life of the force sensor.

[0009] Preferably, the fixed portion comprises a fixed guide sleeve, and the movable portion is a support column slidably installed in the fixed guide sleeve along the up-down direction.

[0010] Preferably, two fixed guide sleeves are arranged at intervals in the up-down direction, and the support column is slidably installed in the two fixed guide sleeves at the same time. The support column is guided by the two fixed guide sleeves, and the guidance is more stable.

[0011] Preferably, the support mechanism is arranged with at least two, and the support columns of at least two of the support mechanisms are used to jointly support the force-bearing platform. At least two support mechanisms can improve the stability of the force-bearing platform during the lifting process.

[0012] Preferably, the support columns of each support mechanism are connected by a crossbeam, and the reciprocating drive mechanism is fixedly connected to the crossbeam to drive the support columns to rise and fall synchronously. By connecting the support columns together and driving them centrally, on the one hand, the number of reciprocating drive mechanisms is reduced, reducing costs, and on the other hand, it is easy to achieve synchronous rise and fall of the support columns, with better consistency.

[0013] Preferably, the reciprocating drive mechanism comprises a reducer, an eccentric wheel and a connecting rod, the eccentric wheel is mounted on the output shaft of the reducer, one end of the connecting rod is hinged to the eccentric wheel, and the other end is hinged to the crossbeam.

[0014] Preferably, the weighing platform further comprises a position monitoring device, which is used to monitor the position of the movable part, and the reciprocating drive mechanism is used to stop when the movable part is detected to move to the supporting position or the releasing position. The position monitoring device is used to control the start and stop of the reciprocating drive mechanism, thereby realizing automatic control.

[0015] Preferably, the weighing platform comprises a trigger rod fixedly arranged relative to the movable part, and the position monitoring device is used to monitor the position of the trigger rod.

[0016] Preferably, the position monitoring device comprises a horizontally opened U-shaped plate, the top and bottom of the U-shaped plate are provided with limit switches, and the two limit switches are connected to the reciprocating drive mechanism to control the reciprocating drive mechanism to stop after the limit switches are triggered; The trigger rod extends into the U-shaped plate, and when the movable part moves to the supporting position, the trigger rod abuts against and triggers the limit switch at the top end, and when the movable part moves to the releasing position, the trigger rod abuts against and triggers the limit switch at the bottom end.

[0017] Preferably, the weighing platform includes a controller, which is connected to the force sensor, the reciprocating drive mechanism, and the position monitoring device. The controller is used to edit and set the time to start the reciprocating drive mechanism, so that the reciprocating drive mechanism automatically starts and stops at the set time frequency, greatly improving the automation of the weighing platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the weighing platform of Example 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the reciprocating drive mechanism of Example 1 of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of a position monitoring device according to Embodiment 1 of the present invention.

[0022] Figure 4 This is a schematic diagram of the weighing platform structure of Example 2 of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the reciprocating drive mechanism of Example 3 of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the reciprocating drive mechanism of Example 4 of the present invention.

[0025] The accompanying drawings are marked as follows: 1. force platform; 2. support mechanism; 21. fixed guide sleeve; 22. support column; 23. trigger rod; 3. position monitoring device; 31. U-shaped plate; 32. limit switch; 4. force sensor; 5. reciprocating drive mechanism; 51. reducer; 52. eccentric wheel; 53. connecting rod; 6. controller; 7. crossbeam; 8. guide rail; 9. slider; 10. hydraulic cylinder; 11. servo motor; 12. screw. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] Embodiment 1 of a weighing platform for a weighing lysimeter: like Figure 1-3 As shown, a weighing platform for a weighing lysimeter (hereinafter referred to as a weighing platform) includes a force-bearing platform 1, a supporting mechanism 2, a position monitoring device 3, a force sensor 4, a reciprocating drive mechanism 5 and a controller 6. The supporting mechanism 2 is used to support the force-bearing platform 1 upward and place the force-bearing platform 1 on the force sensor 4. The force sensor 4 weighs the force-bearing platform 1 and the object on the force-bearing platform 1.

[0028] The support mechanism 2 is located at the bottom of the force-bearing platform 1. The support mechanism 2 includes a fixed part and a movable part. The movable part is assembled on the fixed part in a lifting manner. When the movable part moves upward, it is used to support the force-bearing platform 1. The movable part of the support mechanism 2 and the force-bearing platform 1 only have a supporting relationship but no connection relationship.

[0029] Specifically, the fixed part includes two fixed guide sleeves 21 arranged at intervals up and down, and the two fixed guide sleeves 21 are fixedly installed on an object, such as a wall or the shell of a lysimeter device, and the movable part is a support column 22, and the support column 22 is installed in the two fixed guide sleeves 21 along the up and down directions. The two fixed guide sleeves 21 correspond to each other up and down, so that the support column 22 is perpendicular to the force-bearing platform 1. The support column 22 is guided by the two fixed guide sleeves 21, and the guidance is more stable. Of course, in other embodiments, there can be only one fixed guide sleeve 21, and the stability of the sliding of the support column 22 can be ensured by lengthening the length of the fixed guide sleeve 21.

[0030] Here, there are four support mechanisms 2, and the four support mechanisms 2 are evenly distributed around the edge of the force-bearing platform 1, and the force sensor 4 is vertically opposite to the center position of the force-bearing platform 1. Among them, the support columns 22 of the four support mechanisms 2 are connected by a crossbeam 7. The reciprocating drive mechanism 5 is connected to the crossbeam 7, thereby driving the support columns 22 to rise and fall synchronously. By connecting the support columns 22 together and driving them centrally, on the one hand, the number of reciprocating drive mechanisms is reduced, and the cost is reduced. On the other hand, it is also easy to achieve the synchronous rise and fall of each support column, and the consistency is better.

[0031] A trigger rod 23 is fixedly mounted on one of the support columns 22 , and the trigger rod 23 extends horizontally.

[0032] The force sensor 4 is located below the force platform 1, and the detection end surface at the top of the force sensor 4 is higher than the top surface of the fixed guide sleeve 21 at the top of the support mechanism 2. After the force platform 1 drops a certain distance, the force platform 1 falls on the detection end surface at the top of the force sensor 4, and the force platform 1 is weighed.

[0033] It can be explained here that the force sensor 4 can be one of the specifications: HBM PW15A, Vishay Revere Transducers 1000, Zemic H3-C3, Strainsert RL, or other high-precision weighing instruments.

[0034] like Figure 2 As shown, the reciprocating drive mechanism 5 includes a reducer 51, an eccentric wheel 52 and a connecting rod 53. The eccentric wheel 52 is assembled at the output shaft of the reducer 51. One end of the connecting rod 53 is hinged to the eccentric wheel 52, and the other end is hinged to the cross beam 7. The reducer 51 controls the rotation of the eccentric wheel 52, and lifts the cross beam 7 or pulls the cross beam 7 downward through the connecting rod 53. The reducer 51 drives the eccentric wheel 52 to rotate one circle, which can drive the cross beam 7, the support column 22 and the force-bearing platform 1 to do a lifting movement.

[0035] like Figure 1 , Figure 3 As shown, the position monitoring device 3 includes a U-shaped plate 31, one horizontal side of the U-shaped plate 31 is open, and the upper and lower ends of the U-shaped plate 31 are fixed with limit switches 32, and the trigger rod 23 extends into the U-shaped plate 31. When the trigger rod 23 moves upward with the support column 22, it can trigger the limit switch 32 at the top, and when the trigger rod 23 moves downward with the support column 22, it can trigger the limit switch 32 at the bottom.

[0036] The controller 6 is connected to the position monitoring device 3, the force sensor 4, and the reciprocating drive mechanism 5, and performs program control on the position monitoring device 3, the force sensor 4, and the reciprocating drive mechanism 5 to realize automatic control. When the trigger rod 23 triggers the limit switch 32, the controller 6 can control the reciprocating drive mechanism 5 to stop, so that the support column 22 can stay at this position and wait for the reciprocating drive mechanism 5 to restart.

[0037] Working principle of the present invention: Place the object on the force-bearing platform 1. In the initial state, the reciprocating drive mechanism 5 drives the support column 22 of the support mechanism 2 to move upward through the crossbeam 7, so that the support column 22 lifts the force-bearing platform 1 and separates the force-bearing platform 1 from the fixed guide sleeve 21 at the top. As the support column 22 continues to rise, the trigger rod 23 contacts and triggers the limit switch 32 at the top. The controller 6 controls the reciprocating drive mechanism 5 to stop working. At this time, the position of the support column 22 is the supporting position. At this time, there is a gap between the force sensor 4 and the force-bearing platform 1.

[0038] When measuring the force-bearing platform 1, the reciprocating drive mechanism 5 drives the support column 22 of the support mechanism 2 to move downward through the crossbeam 7, and the support column 22 brings the force-bearing platform 1 down together. Since the detection end surface at the top of the force sensor 4 is higher than the top surface of the fixed guide sleeve 21, when the top surface of the support column 22 is flush with the detection end surface at the top of the force sensor 4, the force-bearing platform 1 falls on the force sensor 4. As the support column 22 continues to move downward, the force-bearing platform 1 is supported by the force sensor 4, and the force sensor 4 weighs the force-bearing platform 1. When the trigger rod 23 contacts the limit switch 32 at the bottom and triggers the limit switch 32 at the bottom, the controller 6 controls the reciprocating drive mechanism 5 to stop working, and the support column 22 is in the release position at this time.

[0039] After the force sensor 4 is in contact with the force-bearing platform 1 for a set time (eg, 10 seconds), the reciprocating drive mechanism 5 drives the support column 22 to rise again, so that the force-bearing platform 1 is separated from the force sensor 4 .

[0040] In the present invention, the force sensor 4 intermittently contacts the force platform 1 to achieve weighing, avoiding zero drift and measurement creep phenomena that occur in the force sensor 4 during long-term force monitoring, thereby improving measurement accuracy and stability and extending the service life of the force sensor 4.

[0041] Embodiment 2 of a weighing platform for a weighing lysimeter: like Figure 4 As shown, a weighing platform for a weighing lysimeter includes a force-bearing platform 1, a supporting mechanism 2, a position monitoring device 3, a force sensor 4, a reciprocating driving mechanism 5, and a controller 6.

[0042] The support mechanism 2 includes a fixed part and a movable part, the fixed part is a guide rail 8, and the movable part is a rectangular slider 9, the slider 9 is slidably placed in the guide rail 8, and the top of the slider 9 can contact and support the force-bearing platform 1. And multiple sliders 9 are also commonly connected to the crossbeam 7, which is used for synchronous lifting of the reciprocating drive mechanism 5.

[0043] In this embodiment, a trigger rod 23 is provided on a slider 9 close to the position detection device 3, and one end of the trigger rod 23 is placed in the position monitoring device 3, so that the position monitoring device 3 monitors the position of the trigger rod 23, that is, monitors the movement distance of the active part of the support mechanism 2.

[0044] The position monitoring device 3 includes a U-shaped plate 31, one horizontal side of the U-shaped plate 31 is open, and the upper and lower ends of the U-shaped plate 31 are fixed with limit switches 32, and the trigger rod 23 extends into the U-shaped plate 31. When the trigger rod 23 moves upward with the support column 22, it can trigger the limit switch 32 at the top, and when the trigger rod 23 moves downward with the support column 22, it can trigger the limit switch 32 at the bottom.

[0045] In this embodiment, the reciprocating drive mechanism 5 includes a reducer 51, an eccentric wheel 52 and a connecting rod 53. The eccentric wheel 52 is assembled on the output shaft of the reducer 51. One end of the connecting rod 53 is hinged to the eccentric wheel 52, and the other end is hinged to the crossbeam 7.

[0046] During use, the output end of the reducer 51 drives the eccentric wheel 52 to rotate, causing the connecting rod 53 to lift or pull the crossbeam 7 up and down, and the crossbeam 7 drives multiple sliders 9 to slide freely on the guide rail 8, thereby lifting or lowering the force platform 1 until the trigger rod 23 moves to the top or bottom of the position monitoring device 3 and stops contacting the limit switch 32, thereby realizing the frequency contact support measurement between the force platform 1 and the force sensor 4.

[0047] Embodiment 3 of a weighing platform for a weighing lysimeter: like Figure 5 As shown, a weighing platform for a weighing type lysimeter includes a force-bearing platform 1, a supporting mechanism 2, a position monitoring device 3, a force sensor 4, a reciprocating driving mechanism 5, and a controller 6.

[0048] In this embodiment, the support mechanism 2 includes a fixed part and a movable part. The fixed part is two fixed guide sleeves 21 arranged symmetrically up and down. The two fixed guide sleeves 21 are fixedly installed on the object. The movable part is a support column 22. The two ends of the support column 22 are movably inserted into the two fixed guide sleeves 21. The two fixed guide sleeves 21 correspond to each other up and down, so that the support column 22 is perpendicular to the force-bearing platform 1.

[0049] The position monitoring device 3 includes a U-shaped plate 31, one horizontal side of the U-shaped plate 31 is open, and the upper and lower ends of the U-shaped plate 31 are fixed with limit switches 32, and the trigger rod 23 extends into the U-shaped plate 31. When the trigger rod 23 moves upward with the support column 22, it can trigger the limit switch 32 at the top, and when the trigger rod 23 moves downward with the support column 22, it can trigger the limit switch 32 at the bottom.

[0050] The reciprocating drive mechanism 5 in this embodiment is a hydraulic cylinder 10, which drives the support mechanism 2 to lift the force-bearing platform, thereby causing the force-bearing platform to move up and down.

[0051] During use, the piston end of the hydraulic cylinder 10 directly drives the crossbeam 7 to rise and fall, and the crossbeam 7 drives the multiple support columns 22 to rise and fall, thereby lifting or lowering the force platform 1 until the trigger rod 23 moves to the top or bottom of the position monitoring device 3 and stops contacting the limit switch 32, thereby realizing the frequency contact support measurement between the force platform 1 and the force sensor 4.

[0052] Embodiment 4 of a weighing platform for a weighing lysimeter: like Figure 6 As shown, a weighing platform for a weighing lysimeter includes a force-bearing platform 1, a supporting mechanism 2, a position monitoring device 3, a force sensor 4, a reciprocating driving mechanism 5, and a controller 6.

[0053] In this embodiment, the support mechanism 2 includes a fixed part and a movable part. The fixed part is two fixed guide sleeves 21 arranged symmetrically up and down. The two fixed guide sleeves 21 are fixedly installed on the object. The movable part is a support column 22. The two ends of the support column 22 are movably inserted into the two fixed guide sleeves 21. The two fixed guide sleeves 21 correspond to each other up and down, so that the support column 22 is perpendicular to the force-bearing platform 1.

[0054] The position monitoring device 3 includes a U-shaped plate 31, one horizontal side of the U-shaped plate 31 is open, and the upper and lower ends of the U-shaped plate 31 are fixed with limit switches 32, and the trigger rod 23 extends into the U-shaped plate 31. When the trigger rod 23 moves upward with the support column 22, it can trigger the limit switch 32 at the top, and when the trigger rod 23 moves downward with the support column 22, it can trigger the limit switch 32 at the bottom.

[0055] The reciprocating drive mechanism 5 in this embodiment includes a servo motor 11 and a screw rod 12 , wherein the screw rod 12 is threadedly sleeved with the cross beam 7 .

[0056] During use, the servo motor 11 drives the screw rod 12 to rotate, thereby causing the crossbeam 7 to move up and down, and then the support mechanism 2 lifts the force-bearing platform, so that the force-bearing platform moves up and down. The crossbeam 7 drives the multiple support columns 22 to move up and down, thereby lifting or lowering the force-bearing platform 1, until the trigger rod 23 moves to the top or bottom of the position monitoring device 3 and stops contacting the limit switch 32, thereby realizing the frequency contact support measurement between the force-bearing platform 1 and the force sensor 4.

[0057] Embodiment 5 of a weighing platform for a weighing lysimeter: The difference from the above embodiment is that, in the above embodiment, the position monitoring device 3 is a contact monitoring method. In this embodiment, the position monitoring device 3 can adopt a non-contact monitoring method, such as replacing the limit switch with a distance sensor, detecting the position of the trigger rod through the distance sensor, and giving a signal to the controller when the set threshold is reached.

[0058] In other embodiments, the trigger rod 23 may be removed, and a mark may be provided on the movable portion. The position monitoring device may determine the position of the movable portion by image acquisition.

[0059] In other embodiments, the position monitoring device includes a distance measuring sensor located at the bottom of the movable part, which monitors the distance of the bottom end surface position of the movable part and compares and analyzes it with a set threshold.

[0060] Of course, in other embodiments, the position monitoring device 3 may also be cancelled. In this case, the start and stop time of the reciprocating drive mechanism 5 needs to be set, and precise lifting and lowering of the movable part can be achieved by precise control, such as by using PLC control.

[0061] Embodiment 6 of a weighing platform for a weighing lysimeter: The difference from the above embodiment is that, in the above embodiment, the movable parts of each supporting mechanism are connected together by a crossbeam, and each movable part is driven to rise and fall synchronously by a reciprocating drive mechanism. In this embodiment, a reciprocating drive mechanism is separately provided corresponding to the movable part of each supporting mechanism, and the synchronous rise and fall of each movable part is achieved by controlling each reciprocating drive mechanism to work synchronously.

[0062] Embodiment 7 of a weighing platform for a weighing lysimeter: The difference from the above embodiment is that in the above embodiment, there are four supporting mechanisms. In this embodiment, the number of supporting mechanisms can be increased or decreased according to actual conditions.

[0063] Several points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0064] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A weighing platform for a weighing lysimeter, comprising a force-bearing platform (1), characterized in that: Also includes: The support mechanism (2) is located below the force-bearing platform (1), and comprises a fixed portion arranged in a fixed manner and a movable portion which is lifted and assembled on the fixed portion, wherein the lifting stroke of the movable portion has a supporting position extending upward from the fixed portion and supporting the force-bearing platform (1), and also has a releasing position descending to below the top surface of the fixed portion; A force sensor (4) is located below the force-bearing platform (1), and the top of the force sensor has a detection end surface for supporting the force-bearing platform (1), and the detection end surface is located above the top surface of the fixed part, so that the force-bearing platform (1) falls on the detection end surface when the movable part descends; A reciprocating drive mechanism (5) is connected to the movable part to drive the movable part to reciprocate between the supporting position and the releasing position.

2. A weighing platform for a weighing lysimeter according to claim 1, characterized in that: The fixed portion comprises a fixed guide sleeve (21), and the movable portion is a support column (22) slidably installed in the fixed guide sleeve (21) in an up-down direction.

3. A weighing platform for a weighing lysimeter according to claim 2, characterized in that: Two fixed guide sleeves (21) are arranged at intervals in the up-down direction, and the support column (22) is slidably installed in the two fixed guide sleeves (21) at the same time.

4. A weighing platform for a weighing lysimeter according to claim 2, characterized in that: The support mechanism (2) is provided with at least two support columns (22), and at least two support columns (22) of the support mechanism (2) are used to jointly support the force-bearing platform (1).

5. A weighing platform for a weighing lysimeter according to claim 4, characterized in that: The support columns (22) of each of the support mechanisms (2) are connected via a crossbeam (7), and the reciprocating drive mechanism (5) is fixedly connected to the crossbeam (7) to drive each of the support columns (22) to rise and fall synchronously.

6. A weighing platform for a weighing lysimeter according to claim 5, characterized in that: The reciprocating drive mechanism (5) comprises a reducer (51), an eccentric wheel (52) and a connecting rod (53); the eccentric wheel (52) is mounted on the output shaft of the reducer (51); one end of the connecting rod (53) is hinged to the eccentric wheel (52), and the other end is hinged to the crossbeam (7).

7. A weighing platform for a weighing lysimeter according to any one of claims 1 to 6, characterized in that: The weighing platform also includes a position monitoring device (3), which is used to monitor the position of the movable part. The reciprocating drive mechanism (5) is used to stop when it is detected that the movable part moves to a supporting position or a releasing position.

8. A weighing platform for a weighing lysimeter according to claim 7, characterized in that: The weighing platform comprises a trigger rod (23) fixedly arranged relative to the movable part, and the position monitoring device (3) is used to monitor the position of the trigger rod (23).

9. A weighing platform for a weighing lysimeter according to claim 8, characterized in that: The position monitoring device (3) comprises a U-shaped plate (31) with a horizontal opening, and limit switches (32) are provided at the top and bottom of the U-shaped plate (31), and the two limit switches (32) are connected to the reciprocating drive mechanism (5) to control the reciprocating drive mechanism (5) to stop after the limit switches (32) are triggered; The trigger rod (23) extends into the U-shaped plate (31); when the movable portion moves to the supporting position, the trigger rod (23) abuts against and triggers the limit switch (32) at the top end; when the movable portion moves to the releasing position, the trigger rod (23) abuts against and triggers the limit switch (32) at the bottom end.

10. A weighing platform for a weighing lysimeter according to claim 7, characterized in that: The weighing platform comprises a controller (6), and the controller (6) is connected to the force sensor (4), the reciprocating drive mechanism (5), and the position monitoring device (3).

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