Test water tank outlet water depth control system

Abstract

The utility model discloses a test water tank outlet water depth control system, which is characterized by comprising a gate valve device arranged at a water tank outlet, a water depth detection device and a water depth gate valve control circuit, the gate valve device comprises a gate plate vertically arranged at an outlet of the water tank, a rotatable threaded rod is upwards arranged on the upper surface of the gate plate, the upper end of the threaded rod is matched with a nut which is limited up and down in a screwed mode, teeth are arranged on the outer surface of the nut, and a driven gear is formed on the outer ring of the nut and meshed with the driving gear. The driving gear is mounted on a main shaft of a water depth motor; the water depth gate valve control circuit is connected with the water depth motor and used for controlling the gate plate to move downwards or upwards. The device can automatically detect the water depth condition at the outlet of the water tank, controls the size of the water outlet through the lifting of the flashboard, achieves the constant control of the water depth, can be conveniently used in a water tank test (a moving bed water tank test) with silt erosion and deposition changes so as to control the constant water depth condition, and finally improves the reliability of a test result.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic engineering test research, in particular to a water depth control system at the outlet of a test flume. Background Art

[0002] Flume test is an important means for carrying out hydraulic engineering research. During the process of hydraulic engineering research, flume tests are often carried out to simulate and analyze the hydraulic state of hydraulic engineering. Many of these flume tests require controlling the boundary conditions at the outlet of the flume. For example, when we want to study the characteristics of sediment movement in an estuary river with changing incoming flow through a flume test, considering that although the incoming flow of the river channel is constantly changing and continuously injected into the ocean, the proportion of the incoming flow within a short period is very small compared to the ocean capacity, and the water supply of the river within a short period will not cause obvious rise or fall of the sea level. Therefore, in specific tests, the above inlet and outlet boundary conditions are usually generalized as the case where the inlet flow changes while the outlet water level remains constant, and it is necessary to keep the water level at the outlet of the flume constant during the test. In addition, if the variable of the riverbed height introduced by the water flow carrying sediment is considered, sometimes it is also necessary to consider how to keep the water depth at the outlet of the flume constant during the test.

[0003] In the prior art, when conducting such tests, in order to keep the water level or water depth at the outlet of the flume constant, the current conventional method is to arrange a gate at the outlet of the flume and arrange a test personnel to stay near the gate to manually adjust the water level or water depth. This method not only consumes manpower but also has poor accuracy. Especially when adjusting the constant water depth, due to the difficulty in detecting the scouring and silting changes of the sediment at the bottom of the flume in time, the adjustment accuracy is extremely low, which greatly reduces the reliability of the test results.

[0004] Therefore, how to better control the water depth at the outlet of the flume, make it convenient to adjust to keep it constant during the test, and finally improve the reliability of the test results has become a problem to be considered and solved by those skilled in the art. Summary of the Utility Model

[0005] Aiming at the above deficiencies of the prior art, the technical problem to be solved by the utility model is: how to provide a water depth control system at the outlet of a test flume that can better realize the adjustment and control of the water depth at the outlet of the test flume, make it convenient to adjust to keep the water depth constant during the test and improve the reliability of the test results, and make it particularly suitable for use in flume tests with sediment scouring and silting changes (mobile bed flume tests).

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] An experimental flume outlet water depth control system, characterized in that it includes a gate valve device, a water depth detection device and a water depth gate valve control circuit arranged at the outlet position of the flume; the gate valve device includes a gate plate vertically arranged at the outlet position of the flume, the lower end of the gate plate is immersed in the flume and an outlet is formed between the lower end of the gate plate and the bottom surface of the flume, both sides of the gate plate are slidably installed in corresponding chutes on the inner walls of both sides of the flume, a rotatable threaded rod is arranged upward on the upper surface of the gate plate, the upper end of the threaded rod is screwed and matched with a horizontally arranged nut which is limited up and down, teeth are arranged on the outer surface of the nut and a passive gear is formed on the outer circle, the passive gear meshes with an active gear, and the active gear is installed on the main shaft of a water depth motor; the water depth gate valve control circuit is connected to the water depth motor, the water depth detection device is used to detect the water depth at the outlet of the flume and output a low water depth signal and a high water depth signal, when the water depth gate valve control circuit receives the low water depth signal, it controls the water depth motor to rotate forward and drives the gate plate to move downward, and when the water depth gate valve control circuit receives the high water depth signal, it controls the water depth motor to rotate reversely and drives the gate plate to move upward.

[0008] After water depth detection like this, relying on the water depth gate valve control circuit to drive the water depth motor to perform forward and reverse control output, and then driving the gate valve to move up and down through the lead screw and nut transmission structure. When the water depth is low, the gate valve moves downward to reduce the height of the lower outlet to raise the water depth, and when the water depth is high, the gate valve moves upward to increase the height of the lower outlet to reduce the water depth, so as to keep it constant. Therefore, this device can be applied to some experiments with sediment erosion and deposition changes while ensuring that the outlet water depth remains unchanged; it can well ensure the constant control of the water depth height, with a simple structure and stable and reliable control.

[0009] Furthermore, the water depth detection device includes a water depth float well arranged at the outlet of the water tank. The lower end of the water depth float well is communicated with the water tank. A water depth float is floatingly arranged in the water depth float well. A water depth detection lifting rod is vertically fixed on the upper edge of the water depth float. The water depth detection device further includes a laser lamp mounting plate vertically arranged at the outlet of the water tank. A row of laser lamps are closely mounted vertically on the laser lamp mounting plate. The lower laser lamp is buried in the sediment at the bottom of the water tank, and the upper laser lamp is exposed above the water surface. The water depth detection device further includes a vertical row of photoelectric plates horizontally arranged side by side at intervals in the direction of the laser lamp irradiation. A light-shielding sleeve is slidably sleeved outside the laser lamp mounting plate in the vertical direction. The upper end of the water depth detection lifting rod is connected with a pull rope. The other end of the pull rope bypasses a lower fixed pulley installed on the water depth float well downward and then bypasses an upper fixed pulley installed above upward, and then is connected to the upper end of the light-shielding sleeve downward to keep the lower end surface of the light-shielding sleeve at the water surface position. The two current output ends of the photoelectric plate are respectively connected to an ammeter by wires to form a power supply circuit. The pointer for displaying the current on the ammeter is a conductive pointer that can rotate in the middle. The middle position of the conductive pointer is made of insulating material, and the upper and lower ends are each made of conductive material to form a contact end. When the water depth exceeds the preset water depth, a forward control contact is arranged on the rotation path of the upper and lower contact ends of the conductive pointer respectively. When the water depth is lower than the preset water depth, a reverse control contact is arranged on the rotation path of the upper and lower contact ends of the conductive pointer respectively. When the water depth is equal to the preset water depth, the upper and lower contact ends of the conductive pointer are located between the forward control contact and the reverse control contact. The contact end, forward control contact and reverse control contact of the conductive pointer are all connected in the water depth gate valve control circuit and are used to output low water depth signals and high water depth signals.

[0010] In this way, when the water level rises, the water level detection lifting rod rises with the water level float, so that the lower end of the light-shielding sleeve is always flush with the water surface, blocking the laser lamp above the water surface. At the same time, the laser lamp below the water bottom is naturally blocked by the sediment. Therefore, the photoelectric plate always receives only the light emitted by the laser lamp at the height of the water body (i.e., the water depth). Therefore, the magnitude of the current generated by the photoelectric plate will change correspondingly with the change of the water depth. The current increases when the water depth increases, and the current decreases when the water depth decreases. When the magnitude of the current changes, the rotation angle of the conductive pointer in the ammeter changes. Furthermore, corresponding low water depth signals and high water depth signals can be output when the water depth changes. Therefore, it has the advantages of simple structure, sensitive detection, stable and reliable water depth signal output, etc.

[0011] Furthermore, the water depth gate valve control circuit includes a power supply, the positive and negative poles of which are respectively connected to the two contact ends of the conductive pointer through wires; the forward control contact corresponding to the contact end connected to the positive output direction of the power supply is connected to the positive terminal of the water depth motor through the forward control output line, and the negative terminal of the water depth motor is connected to another forward control contact through the forward control return line; the reverse control contact corresponding to the contact end connected to the positive output direction of the power supply is connected to the negative terminal of the water depth motor through the reverse control output line, and the positive terminal of the water depth motor is simultaneously connected to another reverse control contact through the reverse control return line.

[0012] In this way, when the water depth exceeds the preset depth, the conductive pointer rotates so that the two contact ends simultaneously contact the two forward control contacts. The positive output current of the power supply is connected to the positive terminal of the water depth motor through the forward control contact and the forward control output line, and then flows back to the negative terminal of the power supply from the negative terminal of the water depth motor through the forward control return line and another forward control contact. The water depth motor outputs a forward rotation control to drive the gate valve to lift upward, increasing the size of the lower water outlet to reduce the water depth. At the same time, when the water depth is lower than the preset depth, the conductive pointer rotates so that the two contact ends simultaneously contact the two reverse control contacts. The positive output current of the power supply is connected to the negative terminal of the water depth motor through the reverse control contact and the reverse control output line, and then flows back to the negative terminal of the power supply from the positive terminal of the water depth motor through the reverse control return line and another reverse control contact. The water depth motor outputs a reverse rotation control to drive the gate valve to fall downward, reducing the size of the lower water outlet to increase the water depth. In this way, the automatic detection and control of the water depth are realized, and the effect of maintaining a fixed water depth under the condition of sediment change is achieved, so that the water tank can be used for experiments that require a fixed water depth boundary condition at the outlet.

[0013] Furthermore, the positive and negative poles of the power supply are also connected to a laser lamp circuit. A sliding rheostat is serially arranged in the laser lamp circuit, and the laser lamps on the laser lamp mounting plate are connected in parallel in the laser lamp circuit.

[0014] In this way, it is convenient to use the same power supply as the laser lamp power supply at the same time, and making use of one thing for multiple purposes can better reduce costs.

[0015] To sum up, the utility model has the advantages of being able to conveniently, quickly and accurately realize the automatic adjustment and control of the water depth at the outlet of the water tank, making it convenient to carry out water tank experiments and improving the reliability of the water tank experiment results. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the water depth control system at the outlet of the experimental water tank adopted when the utility model is implemented. The arrows in the figure indicate the water flow direction. Detailed Embodiments

[0017] The present utility model will be further described in detail below in conjunction with specific embodiments.

[0018] Embodiment 1: A water depth control system for the outlet of a test water tank. Refer to Figure 1 , which includes a gate valve device, a water depth detection device, and a water depth gate valve control circuit arranged at the outlet position of the water tank; the gate valve device includes a gate plate 1 vertically arranged at the outlet position of the water tank, the lower end of the gate plate 1 is immersed in the water tank and an outlet is formed between the lower end of the gate plate and the bottom surface of the water tank, both sides of the gate plate 1 are slidably installed in corresponding sliding grooves on the inner walls of both sides of the water tank, a rotatable threaded rod 2 is arranged upward on the upper surface of the gate plate, the upper end of the threaded rod 2 is screwed and matched with a horizontally arranged nut 3 which is limited up and down, teeth are arranged on the outer surface of the nut 3 to form a passive gear on the outer ring, the passive gear meshes with an active gear, and the active gear is installed on the main shaft of a water depth motor 31; the water depth gate valve control circuit is connected to the water depth motor 31, the water depth detection device is used to detect the water depth at the outlet of the water tank and output a low water depth signal and a high water depth signal, when the water depth gate valve control circuit receives the low water depth signal, it controls the water depth motor to rotate forward and drives the gate plate to move downward, and when the water depth gate valve control circuit receives the high water depth signal, it controls the water depth motor to rotate reversely and drives the gate plate to move upward.

[0019] After water depth detection in this way, the water depth gate valve control circuit drives the water depth motor to perform forward and reverse rotation control output, and then drives the gate valve to move up and down through the screw-nut transmission structure. When the water depth is low, the gate valve moves downward to reduce the height of the lower outlet to raise the water depth, and when the water depth is high, the gate valve moves upward to increase the height of the lower outlet to reduce the water depth, so as to keep it constant. Therefore, this device can be applied to some tests with sediment erosion and deposition changes while ensuring that the outlet water depth remains unchanged; it can well ensure the constant control of the water depth height, and has a simple structure and stable and reliable control.

[0020] Among them, the water depth detection device includes a water depth float well 32 arranged at the outlet of the water tank. The lower end of the water depth float well 32 is communicated with the water tank. A water depth float 33 is floatingly arranged in the water depth float well 32. A water depth detection lifting rod 34 is fixedly arranged vertically along the upper edge of the water depth float 33. The water depth detection device further includes a laser lamp mounting plate 35 arranged vertically at the outlet of the water tank. A row of laser lamps 36 is closely mounted vertically on the laser lamp mounting plate 35. The lower laser lamp is buried in the sediment at the bottom of the water tank, and the upper laser lamp is exposed above the water surface. The water depth detection device further includes a vertical row of photovoltaic panels 37 arranged horizontally side by side at intervals in the direction of the laser lamp irradiation. A light-shielding sleeve 38 is slidably sleeved vertically outside the laser lamp mounting plate 35. The upper end of the water depth detection lifting rod 34 is connected with a pull rope 39. The other end of the pull rope 39 bypasses a lower fixed pulley installed on the water depth float well downward and then bypasses an upper fixed pulley installed above upward, and then is connected downward to the upper end of the light-shielding sleeve 38 to keep the lower end surface of the light-shielding sleeve at the water surface position. The two current output ends of the photovoltaic panel 37 are respectively connected to an ammeter 41 by wires to form a power supply circuit. The pointer for displaying the current on the ammeter is a conductive pointer that can rotate in the middle. The middle position of the conductive pointer 42 is made of insulating material, and the upper and lower ends are made of conductive material to form a contact end respectively. When the water depth exceeds the preset water depth, a forward control contact 44 is arranged on the rotation path of the upper and lower contact ends of the conductive pointer respectively. When the water depth is lower than the preset water depth, a reverse control contact 45 is arranged on the rotation path of the upper and lower contact ends of the conductive pointer respectively. When the water depth is equal to the preset water depth, the upper and lower contact ends of the conductive pointer 42 are located between the forward control contact 44 and the reverse control contact 45. The contact ends, forward control contacts and reverse control contacts of the conductive pointer are all connected to the water depth gate valve control circuit and are used to output low water depth signals and high water depth signals.

[0021] In this way, when the water level rises, the water level detection lifting rod rises with the water level float, so that the lower end of the light-shielding sleeve is always flush with the water surface, blocking the laser lamp above the water surface. At the same time, the laser lamp below the water bottom is naturally blocked by the sediment. Therefore, the photovoltaic panel always receives only the light emitted by the laser lamp at the height of the water body (i.e., the water depth). Therefore, the magnitude of the current generated by the photovoltaic panel will change correspondingly with the change of the water depth. When the water depth increases, the current increases. When the water depth decreases, the current decreases. When the magnitude of the current changes, the rotation angle of the conductive pointer in the ammeter changes. Furthermore, corresponding low water depth signals and high water depth signals can be output when the water depth changes. Therefore, it has the advantages of simple structure, sensitive detection, stable and reliable water depth signal output, etc.

[0022] Among them, the water depth gate valve control circuit includes a power supply 15 (which is the same power supply as the water depth control system during implementation). The positive and negative poles of the power supply 15 are respectively connected to the two contact ends of the conductive pointer 42 through wires. The forward control contact 44 corresponding to the contact end connected to the positive output direction of the power supply is connected to the positive terminal connector of the water depth motor 31 through the forward control output line 46. The negative terminal connector of the water depth motor 31 is connected to another forward control contact through the forward control return line 47. The reverse control contact 45 corresponding to the contact end connected to the positive output direction of the power supply is connected to the negative terminal connector of the water depth motor 31 through the reverse control output line 48. The positive terminal connector of the water depth motor 31 is simultaneously connected to another reverse control contact through the reverse control return line.

[0023] In this way, when the water depth exceeds the preset depth, the conductive pointer rotates so that the two contact ends simultaneously contact the two forward control contacts. The positive output current of the power supply passes through the forward control contacts, the forward control output line, and is connected to the positive terminal connector of the water depth motor, and then returns to the negative pole of the power supply from the negative terminal connector of the water depth motor through the forward control return line and another forward control contact. The water depth motor outputs a forward rotation control to drive the gate valve to lift upward, increasing the size of the lower water outlet to reduce the water depth. At the same time, when the water depth is lower than the preset depth, the conductive pointer rotates so that the two contact ends simultaneously contact the two reverse control contacts. The positive output current of the power supply passes through the reverse control contacts, the reverse control output line, and is connected to the negative terminal connector of the water depth motor, and then returns to the negative pole of the power supply from the positive terminal connector of the water depth motor through the reverse control return line and another reverse control contact. The water depth motor outputs a reverse rotation control to drive the gate valve to fall downward, reducing the size of the lower water outlet to increase the water depth. In this way, the automatic detection and control of the water depth are realized, achieving the effect of maintaining a fixed water depth under the condition of sediment change, so that the water tank can be used for experiments that require a fixed water depth boundary condition at the outlet.

[0024] Among them, a laser lamp circuit 49 is also connected to the positive and negative poles of the power supply 15. A sliding rheostat 50 is serially arranged in the laser lamp circuit 49. Each laser lamp 36 on the laser lamp mounting plate 35 is connected in parallel in the laser lamp circuit 49.

[0025] In this way, it is convenient to use the same power supply as the laser lamp power supply at the same time, and making use of one thing for multiple purposes can better reduce costs.

Claims

1. A test tank outlet water depth control system, characterized in that: The invention comprises a gate valve device arranged at the outlet of a water tank, a water depth detection device and a water depth gate valve control circuit; the gate valve device comprises a gate plate arranged vertically at the outlet of the water tank, the lower end of the gate plate is immersed in the water tank and a water outlet is formed between the lower end of the gate plate and the bottom surface of the water tank, the two sides of the gate plate can be slidably installed in corresponding slide grooves on the inner walls of the two sides of the water tank, a rotatable threaded rod is arranged upward on the upper surface of the gate plate, the upper end of the threaded rod is screwed with a nut arranged horizontally and limited by upper and lower positions, the outer surface of the nut is provided with teeth and a passive gear is formed on the outer ring, the passive gear is meshed with the active gear, and the active gear is installed on the main shaft of a water depth motor; the water depth gate valve control circuit is connected to the water depth motor, the water depth detection device is used to detect the water depth of the water tank outlet and output a low water depth signal and a high water depth signal, when the water depth gate valve control circuit receives a low water depth signal, the water depth motor is controlled to rotate forward and drive the gate plate to move downward, and when the water depth gate valve control circuit receives a high water depth signal, the water depth motor is controlled to reverse and drive the gate plate to move upward.

2. The test tank outlet water depth control system according to claim 1, characterized in that: The water depth detection device includes a water depth float well arranged at the outlet of the water tank, the lower end of the water depth float well is connected to the water tank, a water depth float is floated in the water depth float well, and a water depth detection lifting rod is vertically fixed on the upper edge of the water depth float; the water depth detection device also includes a laser light mounting plate vertically arranged at the outlet of the water tank, a row of laser lights are vertically and tightly mounted on the upper edge of the laser light mounting plate, the lower laser lights are buried in the mud and sand at the bottom of the water tank, and the upper laser lights are exposed above the water surface, the water depth detection device also includes a vertical row of photoelectric panels horizontally and spaced apart facing the irradiation direction of the laser lights, a light shielding sleeve is vertically slidably sleeved on the outside of the laser light mounting plate, a pull rope is connected to the upper end of the water depth detection lifting rod, the other end of the pull rope passes downward around a lower fixed pulley installed on the water depth float well and then passes upward around an upper fixed pulley installed above, and then is downwardly connected to the light shielding sleeve The upper end of the tube makes the shading sleeve keep the lower end surface located at the water surface; the two current output ends of the photoelectric panel are respectively connected to an ammeter by wires to form a power supply circuit, the pointer on the ammeter for displaying the current is a rotatable conductive pointer in the middle, the middle position of the conductive pointer is made of insulating material and the upper and lower ends are respectively formed with conductive materials to form a contact end, when the water depth exceeds the preset water depth, a forward control contact is respectively arranged on the rotation path of the upper and lower contact ends of the conductive pointer, when the water depth is lower than the preset water depth, a reverse control contact is respectively arranged on the rotation path of the upper and lower contact ends of the conductive pointer, when the water depth is equal to the preset water depth, the upper and lower contact ends of the conductive pointer are located between the forward control contact and the reverse control contact; the contact end, forward control contact and reverse control contact of the conductive pointer are all connected in the water depth gate valve control circuit and are used to output low water depth signals and high water depth signals.

3. The test tank outlet water depth control system according to claim 2, characterized in that: The water depth gate valve control circuit includes a power supply, and the positive and negative poles of the power supply are respectively connected to the two contact ends of the conductive pointer through the circuit; the forward control contact corresponding to the contact end connected to the positive output direction of the power supply is connected to the positive pole connector of the water depth motor through the forward control output circuit, and the negative pole connector of the water depth motor is connected to another forward control contact through the forward control return circuit; the reverse control contact corresponding to the contact end connected to the positive output direction of the power supply is connected to the negative pole connector of the water depth motor through the reverse control output circuit, and the positive pole connector of the water depth motor is simultaneously connected to another reverse control contact through the reverse control return circuit.

4. The test tank outlet water depth control system according to claim 3, characterized in that: The positive and negative ends of the power supply are also connected to a laser lamp circuit, a sliding rheostat is arranged in series in the laser lamp circuit, and the laser lamps on the laser lamp mounting plate are installed in parallel in the laser lamp circuit.

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