Flow detection device for water intake channel of river channel

Abstract

The utility model discloses a flow detection device for a riverway water intake channel, which comprises a first water pressure receiving groove and a second water pressure receiving groove which are arranged at the top of the water intake channel, and the first water pressure receiving groove is arranged on a large-diameter reducing section on the water intake channel. The second water pressure receiving groove is formed in the water intake channel equal-diameter section at one end of the variable-diameter section; a piston plate in a floating state is arranged in each of the first water pressure bearing groove and the second water pressure bearing groove, and a piston rod is upwards and fixedly arranged at the upper end of each piston plate and located in a darkroom; a vertical row of laser lamps for control are vertically arranged in parallel on the piston rod of the first water pressure receiving groove and right opposite to the piston rod of the second water pressure receiving groove; and a vertical row of photoelectric plates for control are arranged on a piston rod of the second water pressure receiving groove and right opposite to the laser lamp for control. The utility model has the advantages that the water taking flow in the pipeline can be better detected, and the detection result can directly output an electric signal for feedback control.

Description

TECHNICAL FIELD

[0001] The utility model relates to a river water taking and water guiding technical field, concretely relates to a flow detection device for river water taking channel. BACKGROUND

[0002] People's urban life and agricultural irrigation water usually need to take water through the river, and the general river water taking mode is to set the water taking channel communicated with the river side to guide the river water to realize water taking. The river water taking often has different demands on the water taking amount at different time periods, and the water taking flow of the water taking port needs to be controlled. The prior art usually sets the traditional gate at the water taking port to control the water guiding flow, and the gate has simple structure and is easy to manufacture, but has single function and has the following defects: the gate adjustment effect is limited, if the river itself is low due to the water level fluctuation and the like, then it is often difficult to obtain sufficient water taking amount, and it is difficult to achieve the water taking effect meeting the demand.

[0003] In order to solve the above problems, the applicant considers designing a river water taking system, which comprises a water taking channel communicated and arranged at one side of the river, and a gate valve device arranged at a water taking port where the water taking channel and the river meet, characterized in that a telescopic dike device is further arranged at the downstream end of the river bank adjacent to the water taking channel, the telescopic dike device comprises a dike body, the dike body is telescopically installed in a body accommodating groove arranged opposite the river on the river bank, a body telescopic control device is arranged on one side of the body accommodating groove and connected with the dike body, and the body telescopic control device can control one end of the dike body to extend out of the body accommodating groove.

[0004] In this way, the river water taking system can be controlled according to the water flow in the water taking channel, when the flow cannot meet the water taking demand, the gate valve device is gradually opened to increase the flow in the water taking channel and meet the water taking demand. If the river water level drops and the gate valve device is completely opened and still cannot meet the water taking demand, the dike body can be further controlled to extend into the river under the action of the body telescopic control device, so that the water level at the water taking channel is raised, and the water flow in the water taking channel is increased. The water taking demand is better met, and the water taking effect is ensured.

[0005] Among them, when the river bed position of the river is high, the water taking channel usually adopts the pipeline structure form with the water taking port located below the river water surface. In this case, how to realize the water flow detection in the water taking channel and make the detection result directly output as an electric signal for feedback control becomes a problem to be further considered and solved by the person skilled in the art. UTILITY MODEL CONTENTS

[0006] In view of the above prior art, the technical problem to be solved by the utility model is: how to provide a flow detection device for river water intake channel which can better realize water flow detection in the pipeline, so that the detection result can be directly output as an electric signal for feedback control.

[0007] In order to solve the above technical problem, the utility model adopts the following technical scheme:

[0008] A flow detection device for river water intake channel, the water intake channel is a pipeline structure with a water intake port located below the water surface of the river, characterized in that: a first water pressure receiving groove and a second water pressure receiving groove are arranged in communication at the top of the water intake channel, the first water pressure receiving groove is arranged on a large-diameter variable-diameter section which is outwardly expanded on the water intake channel, and the second water pressure receiving groove is arranged on a constant-diameter section of the water intake channel at one end of the variable-diameter section; a piston plate in a floating state is arranged in each of the first water pressure receiving groove and the second water pressure receiving groove, a piston rod is fixedly arranged on the upper end of the piston plate and located in a darkroom, a vertical control laser lamp is arranged on the piston rod of the first water pressure receiving groove in vertical alignment with the piston rod of the second water pressure receiving groove, and the control laser lamp is connected with a power supply; a vertical control photoelectric plate is arranged on the piston rod of the second water pressure receiving groove in alignment with the control laser lamp.

[0009] In this way, the two power output ends of the control photoelectric plate can be connected to the joint control circuit of the gate valve device and the dam body expansion control device to form an automatic control system.

[0010] Specifically, when the water flow passes through the water pressure receiving groove, the water pressure acting on the pipe wall will lift the piston plate and the piston rod thereon upward. At the same time, due to the Venturi effect, there will be a pressure difference at the positions of the first water pressure receiving groove and the second water pressure receiving groove based on the different diameters of the water intake channel, and the greater the water flow of the water intake channel, the greater the pressure difference will be, and the smaller the water flow of the water intake channel, the smaller the pressure difference will be. Therefore, when the water flow of the water intake channel decreases, the pressure difference between the first water pressure receiving groove and the second water pressure receiving groove decreases, the height difference of the two piston rods lifted by the pressure decreases, and the area of the control laser lamp irradiated on the control photoelectric plate increases, and the power output signal formed increases. Therefore, according to the change of the power output signal, the control of the gate valve and the dam can be realized through the control circuit, specifically, the joint control circuit is used to control the gate valve to gradually open and the dam to gradually extend in sequence according to the change of the power signal output by the control photoelectric plate from small to large. That is, the automatic control process of the water flow of the water intake channel can be completed. It has the characteristics of simple structure and convenient control.

[0011] Further, the joint control circuit comprises a gate valve control ammeter and a dike control ammeter, the gate valve control ammeter and the dike control ammeter are connected in parallel with two power output terminals of the control photoelectric plate to form a parallel input terminal power supply circuit; the pointer for displaying current on the gate valve control ammeter is a rotatable gate valve control conductive pointer in the middle, the gate valve control conductive pointer and its own rotating shaft are insulated, a pair of gate valve lifting contacts are arranged in the forward rotation direction of the gate valve control conductive pointer and are connected after the gate valve control conductive pointer is rotated forward, the gate valve lifting contacts are connected with the power supply and the gate valve motor through wires to form a gate valve lifting control circuit (the gate valve lifting control circuit can control the gate valve motor to rotate forward and drive the gate plate to lift upward and open), a pair of gate valve descending contacts are arranged in the reverse rotation direction of the gate valve control conductive pointer and are connected after the gate valve control conductive pointer is rotated backward, the gate valve descending contacts are connected with the power supply and the gate valve motor through wires to form a gate valve descending control circuit (the gate valve descending control circuit can control the gate valve motor to rotate backward and drive the gate plate to descend and close; in specific implementation, the gate valve control conductive pointer is insulated in the middle and its two ends are connected with wires connected to the power supply to realize connection of the gate valve lifting control circuit after forward rotation and connection of the gate valve descending control circuit after backward rotation, of course, the structure of the dike control conductive pointer can also be used to realize the connection in implementation); the pointer for displaying current on the dike control ammeter is a rotatable dike control conductive pointer in the middle, the dike control conductive pointer and its own rotating shaft are insulated, a pair of dike extending contacts are arranged in the forward rotation direction of the dike control conductive pointer and are connected after the dike control conductive pointer is rotated forward, the dike extending contacts are connected with the power supply and the dike motor through wires to form a dike extending control circuit (the dike extending control circuit can drive the dike motor to rotate forward and make the dike extend outward), a pair of dike retracting contacts are arranged in the reverse rotation direction of the dike control conductive pointer and are connected after the dike control conductive pointer is rotated backward, the dike retracting contacts are connected with the power supply and the dike motor through wires to form a dike retracting control circuit (the dike retracting control circuit can drive the dike motor to rotate backward and make the dike retract inward, in specific implementation, the dike control conductive pointer is conductive as a whole and is connected with the dike extending control circuit after forward rotation and the dike retracting control circuit after backward rotation, of course, the structure of the gate valve control conductive pointer can also be used to realize the connection in implementation); a first normally closed safety electromagnetic switch (used for preventing short circuit) is installed in the dike extending control circuit, the electromagnet of the first safety electromagnetic switch is connected in series in the dike retracting control circuit and can disconnect the first safety electromagnetic switch after connection, a second normally closed safety electromagnetic switch (used for preventing short circuit) is installed in the dike retracting control circuit, the electromagnet of the second safety electromagnetic switch is connected in series in the dike extending control circuit and can disconnect the second safety electromagnetic switch after connection.

[0012] The dyke extension control circuit is also provided with a dyke extension start trigger switch in open state in series, which is installed on the screw rod of the gate and triggers on after the gate rises to the limit position; the dyke retraction control circuit is also provided with a dyke retraction start trigger switch in open state in series, which is installed on the dam body accommodating groove and triggers on after the dyke extension (so that the dyke retraction control circuit is turned on after the dyke extension, but the dyke retraction control circuit is always in off state before the dyke extension, so that it does not interfere with the control process of the gate valve); the gate valve lifting control circuit and the gate valve descending control circuit have a common line section with the same wire at the position connected with the gate valve motor, and a gate valve protection trigger switch in closed state is installed in the common line section and triggers off after the dyke extension.

[0013] Thus, in the above-mentioned combined control circuit, the control photocell outputs power to simultaneously drive the pointers of the gate valve control ammeter and the dike control ammeter to rotate, and through the pre-calibration setting, when the gate valve is opened to about half the state and the water flow in the water channel can meet the demand, the control photocell outputs power to make the pointers of the two ammeters rotate to the zero state at the middle position between positive and reverse rotation. In use, when the water flow in the water channel decreases, the two power output ends of the control photocell output increased current, which simultaneously drives the pointers of the gate valve control ammeter and the dike control ammeter to rotate positively, and respectively connects the gate valve lifting contact and the dike extension contact. However, when the gate valve is not lifted to the limit position due to the existence of the dike extension start trigger switch on the screw rod, the dike extension control circuit will not be connected. Therefore, at this time, only the gate valve lifting control circuit is connected to work, so that the gate valve is lifted to increase the water flow in the water channel (on the contrary, when the water flow in the water channel increases, the pointers of the gate valve control ammeter and the dike control ammeter are reversed, and respectively connect the gate valve descending contact and the dike retracting contact. However, the existence of the dike retracting start trigger switch makes the dike retracting control circuit not be connected, so at this time, only the gate valve descending control circuit is connected to work, so that the gate valve is lowered to reduce the water flow in the water channel). Until the gate valve is lifted to the limit position and the water flow is still insufficient, at this time, the dike extension start trigger switch on the gate plate is connected by the screw rod, the dike extension control circuit is connected to work to drive the dike motor to rotate positively, so that the dike is extended. After the dike is extended, the dike retracting start trigger switch is connected, and the gate valve protection trigger switch is disconnected to protect the gate valve, so that the gate valve remains at the maximum opening position during the process of the dike continuing to extend or retract and does not act. At the same time, after the dike is extended, the dike retracting start trigger switch is connected, so once the water flow in the water channel is sufficient and excessive, the pointer of the dike control ammeter is reversed, and the dike retracting control circuit is connected to control the dike to gradually retract. When the dike is completely retracted, the gate valve protection trigger switch acts and changes to a normally closed state, so that the gate valve descending control circuit can start to work, and the gate valve starts to descend, which disconnects the dike extension start trigger switch on the screw rod and forms a circuit protection for the dike. Therefore, the above-mentioned combined control circuit realizes the perfect connection and switching control between the gate valve control part and the dike control part by relying on the pure circuit structure, without using a computer or PLC combined with a remote control switch for control, and has the characteristics of low cost and reliable control.

[0014] Further, the water taking way top is located on the equal diameter section of the other end of the reducing section, and a third water pressure receiving groove is arranged symmetrically with the second water pressure receiving groove structure, the third water pressure receiving groove is internally provided with a floating piston plate and a corresponding piston rod and is symmetric with the piston plate and the piston rod structure in the second water pressure receiving groove, a vertical calibration laser lamp is symmetrically installed on the piston rod of the first water pressure receiving groove on the side opposite to the control laser lamp, the piston rod of the third water pressure receiving groove is located in the darkroom and is provided with a vertical calibration photoelectric plate opposite to the calibration laser lamp, the calibration photoelectric plate and the control photoelectric plate are symmetrically arranged, and the power output end of the calibration photoelectric plate and a calibration ammeter are connected in series to form a control loop.

[0015] A calibration sliding rheostat is further arranged in the circuit branch of the sluice valve control ammeter, the circuit branch of the dike control ammeter and the circuit trunk connected with the two power output ends of the control photoelectric plate.

[0016] A sluice valve calibration motor is further arranged in the sluice valve device, and the output shaft of the sluice valve calibration motor is in transmission connection with the nut on the screw rod.

[0017] In this way, when zero calibration is needed, the sluice valve is adjusted to a half extended state by the sluice valve calibration motor, and the water flow information of the water taking way at this time is fed back through the calibration ammeter reading, so that the required flow for normal water taking is met, and then the resistance values of the three calibration sliding rheostats are adjusted so that the pointers of the sluice valve control ammeter and the dike control ammeter are simultaneously in zero state. Therefore, the above structure can more accurately control the zero calibration of the sluice valve control ammeter and the dike control ammeter.

[0018] Further, the dike extension start trigger switch comprises an insulating rod coaxially arranged on the upper end of the screw rod, an electrically conductive section is arranged in the middle of the insulating rod, an electrically conductive cylinder is arranged in contact with the sliding sleeve on the upper end of the insulating rod, the electrically conductive section and the electrically conductive cylinder are connected in series to the dike extension control circuit, and the electrically conductive section and the electrically conductive cylinder are in contact and conductive when the screw rod rises to the limit position.

[0019] In this way, the structure is simple and the control is reliable.

[0020] Further, the dike retraction start trigger switch comprises a spring switch trigger rod connected in series in the dike retraction control circuit, and further comprises an insulating pressing rod arranged at the innermost end of the dike, when the dike is completely retracted, the insulating pressing rod and the spring switch trigger rod are in abutment and keep the spring switch trigger rod in the normally open state, and when the dike is extended, the insulating pressing rod moves away from the spring switch trigger rod and returns to the closed and connected state.

[0021] In this way, the structure is simple and the control is reliable.

[0022] Furthermore, the gate valve protection trigger switch includes a normally closed switch contact rod connected in series in a collinear segment. The switch contact rod is connected to a pressure head via a connecting rod and a spring. The front end of the pressure head has an inclined surface located on the front extension path of the groyne, so that when the groyne extends, the pressure head can be pushed through the inclined surface to open the switch contact rod.

[0023] This design offers advantages such as simple structure and reliable control.

[0024] In summary, this utility model has the advantage of being able to better adjust the water intake according to the water level and maintain a stable water intake. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a river water intake system employing the structure of this invention. The diagram is a top-down plan view. The arrows in the diagram indicate the direction of water flow.

[0026] Figure 2 This is a structural diagram of the automatic control system in a river water intake system. To better illustrate the circuit connection structure, the applicant adjusted the view orientation of the structural diagrams involving non-circuit components. The diagram shows the structure of the water intake channel and its associated equipment. Figure 1 The left view direction, involving the groynes, is as follows: Figure 1 The same top-down view is used for both sections involving the ammeters.

[0027] Figure 3 for Figure 2 The enlarged diagram at point A in the middle is used to show the structure of the groyne retraction start trigger switch.

[0028] Figure 4 for Figure 2 The enlarged diagram at point B in the middle shows the structure of the gate valve protection trigger switch.

[0029] Figure 5 for Figure 2 A schematic diagram of the structure of an ammeter for controlling a single gate valve, viewed from the front.

[0030] Figure 6 for Figure 2 A schematic diagram of the structure of the ammeter used for controlling a single groyne in the middle, viewed from the front.

[0031] Figure 7 for Figure 2 A schematic diagram of the power supply circuit for a single input terminal.

[0032] Figure 8 for Figure 2 A schematic diagram of the control circuit for lifting a single gate valve.

[0033] Figure 9 forFigure 2 Schematic diagram of the separate gate valve lowering control circuit.

[0034] Figure 10 For Figure 2 Schematic diagram of the separate groin extension control circuit.

[0035] Figure 11 For Figure 2 Schematic diagram of the separate groin retraction control circuit. DETAILED DESCRIPTION

[0036] The river water taking system adopting the structure of the utility model and the accompanying drawings thereof will be further described in detail.

[0037] Embodiment: a river water taking system, referring to Figures 1-11 As shown, it comprises a water taking channel 2 arranged on one side of the river channel 1, a gate valve device arranged at the water taking port of the water taking channel 2 and the river channel, and a telescopic groin device arranged adjacent to the downstream end of the river bank where the water taking channel is located, the telescopic groin device comprising a groin body 3 telescopically installed in a body accommodating groove 4 arranged opposite to the river channel on the river bank, a body extension control device arranged on one side of the body accommodating groove 4 and connected with the groin body, and the body extension control device being capable of controlling the extension of one end of the groin body 3 out of the body accommodating groove, and the water taking channel further comprising a flow detection device.

[0038] In this way, the river water taking system can detect the water flow in the water taking channel through the flow detection device, and when the flow cannot meet the water taking demand, the gate valve device is gradually opened to increase the flow in the water taking channel and meet the water taking demand. If the water level of the river channel drops and the gate valve device is fully opened but still cannot meet the water taking demand, the groin body can be further controlled to extend into the river channel under the action of the body extension control device, so that the water level at the water taking channel is raised, thereby increasing the water flow in the water taking channel and better meeting the water taking demand and ensuring the water taking effect. In implementation, the flow detection device is connected with the gate valve device and the body extension control device through an automatic control system.

[0039] The gate valve device comprises a gate plate 5 installed in the gate slots on both sides of the water taking port in the vertical direction, a screw rod 6 arranged on the gate plate 5 in the vertical direction, a nut 7 with a limited height direction arranged in cooperation with the screw rod 6, and a gate valve motor 8 in transmission connection with the nut 7.

[0040] In this way, the nut and the screw rod form a screw nut transmission pair, the gate valve motor output drives the nut to rotate forward or reversely, which can drive the screw rod to translate upward or downward, thereby realizing the opening and closing control of the gate valve. The structure is simple and the control is convenient.

[0041] The dam body telescopic control device comprises a rack 9 fixedly arranged on the length direction of the groyne dam body 3, and a transmission gear 10 engaged with the rack 9, and the transmission gear 10 is in transmission connection with a groyne motor 13 arranged on one side of the dam body accommodating groove.

[0042] In this way, the rack and the transmission gear form a gear rack transmission pair, and the groyne motor outputs forward and reverse rotation, drives the groyne to extend or retract through the transmission gear and the rack, and realizes control. The device has the advantages of simple structure and convenient control.

[0043] As an alternative embodiment, the water intake channel is an open channel structure, the flow detection device comprises a water level detection device and a flow rate detection device arranged in the water intake channel, the water level detection device and the flow rate detection device are connected to the control center, and the control center is connected to the gate valve device and the telescopic groyne device to form an automatic control system.

[0044] In this way, the water level detection device and the flow rate detection device can detect the water level and the flow rate in the water intake channel respectively, and then the control center can calculate the water flow in the water intake channel according to the obtained size of the water intake channel, and then feedback to realize the control of the gate valve device and the telescopic groyne device. In this way, the water level detection device and the flow rate detection device can be obtained by using existing products with existing functions, and are easy to implement.

[0045] In the embodiment, the water intake channel 2 is a pipeline structure with the water intake port located below the water surface of the river channel (especially suitable for water intake at a high position of the riverbed), the flow detection device comprises a first water pressure receiving groove 11 and a second water pressure receiving groove 12 arranged in communication at the top of the water intake channel, the first water pressure receiving groove 11 is arranged on a large-diameter variable-diameter section which is outwardly expanded from the water intake channel, and the second water pressure receiving groove 12 is arranged on a constant-diameter section of the water intake channel at one end of the variable-diameter section; a floating piston plate is arranged in each of the first water pressure receiving groove 11 and the second water pressure receiving groove 12, an upper end of the piston plate is fixedly provided with a piston rod, the piston rod is located in a darkroom (not shown in the darkroom diagram), a vertical control laser lamp 14 is arranged vertically and in parallel with the piston rod of the second water pressure receiving groove on the piston rod of the first water pressure receiving groove 11, the control laser lamp 14 is connected to a power supply 15; a vertical control photoelectric plate 16 is arranged on the piston rod of the second water pressure receiving groove opposite to the control laser lamp, two power output ends of the control photoelectric plate 16 are connected to the joint control circuit of the gate valve device and the dam body telescopic control device to form an automatic control system.

[0046] In this way, when the water flows through the water pressure receiving groove, the water pressure acting on the pipe wall will push the piston plate and the piston rod thereon upward. At the same time, due to the Venturi effect, there will be a pressure difference between the first water pressure receiving groove and the second water pressure receiving groove based on the different pipe diameters of the water intake channel, and the greater the water flow of the water intake channel, the greater the pressure difference will be, and the smaller the water flow of the water intake channel, the smaller the pressure difference will be relatively. Therefore, when the water flow of the water intake channel decreases, the pressure difference between the first water pressure receiving groove and the second water pressure receiving groove becomes smaller, so that the height difference of the two piston rods pushed by the pressure becomes smaller, and then the area of the control laser lamp irradiated on the control photoelectric plate becomes larger, and the power output signal formed becomes larger. Therefore, according to the change of the power output signal, the control circuit can be used to control the gate valve and the dike. Specifically, the combined control circuit is used to control the gate valve to be gradually opened and the dike to be gradually extended in sequence according to the change of the power signal output by the control photoelectric plate from small to large. That is, the automatic control process of the water flow of the water intake channel can be completed. It has the characteristics of simple structure and convenient control.

[0047] The joint control circuit includes a gate valve control ammeter 17 and a dike control ammeter 18. The gate valve control ammeter 17 and the dike control ammeter 18 are connected in parallel with two power output ends of the control photoelectric plate 16 to form a parallel input power supply circuit 19. The pointer for displaying current on the gate valve control ammeter 17 is a rotatable gate valve control conductive pointer 20 in the middle. The gate valve control conductive pointer 20 is insulated from its own rotating shaft. A pair of gate valve lifting contacts 21 are arranged in the forward rotation direction of the gate valve control conductive pointer 20 and are connected to the gate valve control conductive pointer after the forward rotation. The gate valve lifting contacts 21 are connected to the power supply 15 and the gate valve motor 8 through wires to form a gate valve lifting control circuit 22. The gate valve lifting control circuit can control the forward rotation of the gate valve motor and drive the gate to lift upward and open. A pair of gate valve descending contacts 23 are arranged in the reverse rotation direction of the gate valve control conductive pointer 20 and are connected to the gate valve control conductive pointer after the reverse rotation. The gate valve descending contacts 23 are connected to the power supply 15 and the gate valve motor 8 through wires to form a gate valve descending control circuit 24. The gate valve descending control circuit can control the reverse rotation of the gate valve motor 8 and drive the gate to descend and close. In specific implementation, the middle part of the gate valve control conductive pointer 20 is insulated, and the two ends are connected to the wires connected to the power supply to realize the connection of the gate valve lifting control circuit after the forward rotation and the connection of the gate valve descending control circuit after the reverse rotation. Of course, the structure of the dike control conductive pointer can also be used to realize the connection. The pointer for displaying current on the dike control ammeter 18 is a rotatable dike control conductive pointer 25 in the middle. The dike control conductive pointer 25 is insulated from its own rotating shaft. A pair of dike extending contacts 26 are arranged in the forward rotation direction of the dike control conductive pointer 25 and are connected to the dike control conductive pointer after the forward rotation. The dike extending contacts 26 are connected to the power supply 15 and the dike motor 13 through wires to form a dike extending control circuit 27. The dike extending control circuit can drive the dike motor to rotate forward and make the dike extend outward. A pair of dike retracting contacts 28 are arranged in the reverse rotation direction of the dike control conductive pointer 25 and are connected to the dike control conductive pointer 25 after the reverse rotation. The dike retracting contacts 28 are connected to the power supply 15 and the dike motor 13 through wires to form a dike retracting control circuit 29. The dike retracting control circuit can drive the dike motor to rotate reversely and make the dike retract inward. In specific implementation, the dike control conductive pointer 25 is conductive as a whole and is connected to the dike extending control circuit after the forward rotation and the dike retracting control circuit after the reverse rotation. Of course, the structure of the gate valve control conductive pointer can also be used to realize the connection.A first normally closed safety electromagnetic switch 30 (for preventing short circuit) is installed in the groyne extension control circuit 27, the electromagnet of the first safety electromagnetic switch 30 is connected in series in the groyne retraction control circuit 29 and can turn off the first safety electromagnetic switch 30 after being turned on, a second normally closed safety electromagnetic switch 31 (for preventing short circuit) is also installed in the groyne retraction control circuit 29, the electromagnet of the second safety electromagnetic switch 31 is connected in series in the groyne extension control circuit 27 and can turn off the second safety electromagnetic switch 31 after being turned on;

[0048] A normally open groyne extension start trigger switch 32 is also connected in series in the groyne extension control circuit 27, the groyne extension start trigger switch 32 is installed on the screw rod 6 of the gate and triggers on after the gate rises to the limit position; a normally open groyne retraction start trigger switch 33 is also connected in series in the groyne retraction control circuit 29, the groyne retraction start trigger switch 33 is installed on the dam body accommodating groove and triggers on after the groyne 3 extends (so that the groyne retraction control circuit is turned on as soon as the groyne extends and the water flow in the waterway decreases, but the groyne retraction control circuit can be kept off before the groyne extends, so as not to interfere with the control process of the gate valve); the gate valve lifting control circuit 22 and the gate valve lowering control circuit 24 have a common line section 35 with the same wire at the position connected to the gate valve motor 8, a normally closed gate valve protection trigger switch 36 is installed in the common line section 35 and triggers off after the groyne extends.

[0049] Thus, in the above-mentioned combined control circuit, the control photocell outputs power to drive the pointers of the gate valve control ammeter and the dike control ammeter to rotate, and through the pre-calibration setting, when the gate valve is opened to about half of the state and the water flow in the water channel can meet the demand, the control photocell outputs power to drive the pointers of the two ammeters to rotate to the zero state at the middle position between the positive and negative rotations. In use, when the water flow in the water channel decreases, the two power output ends of the control photocell output increased current, which drives the pointers of the gate valve control ammeter and the dike control ammeter to rotate positively, and connects the gate valve lifting contact and the dike extension contact, respectively. However, when the gate valve is not lifted to the limit position due to the existence of the dike extension start trigger switch on the screw rod, the dike extension control circuit will not be connected. Therefore, only the gate valve lifting control circuit is connected to work at this time, so that the gate valve is lifted to increase the water flow in the water channel (on the contrary, when the water flow in the water channel increases, the pointers of the gate valve control ammeter and the dike control ammeter are reversed, and the gate valve descending contact and the dike retracting contact are connected, respectively. However, the existence of the dike retracting start trigger switch makes the dike retracting control circuit not be connected, so that only the gate valve descending control circuit is connected to work at this time, so that the gate valve is lowered to reduce the water flow in the water channel). Until the gate valve is lifted to the limit position and the water flow is still insufficient, at this time, the dike extension start trigger switch on the gate plate is connected by the screw rod, the dike extension control circuit is connected to work to drive the dike motor to rotate positively, so that the dike is extended. After the dike is extended, the dike retracting start trigger switch is connected, and the gate valve protection trigger switch is disconnected to protect the gate valve, so that the gate valve remains at the maximum opening position and does not move during the process of the dike continuing to extend or retract. At the same time, after the dike is extended, the dike retracting start trigger switch is connected, so that once the water flow in the water channel is sufficient and excessive, the pointer of the dike control ammeter is reversed, and the dike retracting control circuit is connected to control the dike to retract gradually. When the dike is completely retracted, the gate valve protection trigger switch is actuated and changes to a normally closed state, so that the gate valve descending control circuit can start to work, and the gate valve starts to descend, which disconnects the dike extension start trigger switch on the screw rod and protects the dike. Therefore, the above-mentioned combined control circuit realizes perfect connection and switching control between the gate valve control part and the dike control part by relying on the pure circuit structure, without using a computer or PLC combined with a remote control switch for control, which has the characteristics of low cost and reliable control.

[0050] Wherein, the top of the water channel 2 is located on the other end of the equal diameter section of the reducing section, and a third water pressure receiving groove 38 is arranged symmetrically with the second water pressure receiving groove 12. The third water pressure receiving groove 38 is internally provided with a piston plate in a floating state and a corresponding piston rod, and is symmetrically structured with the piston plate and the piston rod in the second water pressure receiving groove 12. The piston rod of the first water pressure receiving groove 11 is symmetrically provided with a vertical calibration laser lamp 39 (the calibration laser lamp is connected to a power supply for power supply) on the side opposite to the control laser lamp 14. The piston rod of the third water pressure receiving groove 38 is provided with a vertical calibration photoelectric plate 40 opposite to the calibration laser lamp in the darkroom. The calibration photoelectric plate 40 is symmetrically arranged with the control photoelectric plate 16. The power output end of the calibration photoelectric plate 40 and a calibration ammeter 41 are connected in series to form a control loop.

[0051] The circuit branch of the sluice valve control ammeter 17 and the circuit branch of the dike control ammeter 18 and the circuit trunk connected with the two power output ends of the control photoelectric plate 16 are respectively provided with a calibration sliding resistor 42.

[0052] The sluice valve device is further provided with a sluice valve calibration motor 43. The output shaft of the sluice valve calibration motor 43 is in transmission connection with the nut 7 on the screw rod.

[0053] In this way, when calibration and zero setting are required, the sluice valve is adjusted to a half extended state by the sluice valve calibration motor, and the water flow information of the water channel at this time is fed back through the calibration ammeter reading, so that the required flow for regular water taking is met. Then, the pointers of the sluice valve control ammeter and the dike control ammeter are simultaneously in zero setting state by adjusting the resistance values of the three calibration sliding resistors. Therefore, the above structure can more accurately control the zero setting calibration of the sluice valve control ammeter and the dike control ammeter.

[0054] The dike extension start trigger switch 32 includes an insulating rod 44 coaxially arranged on the upper end of the screw rod 6. An electrically conductive section 45 is arranged in the middle of the insulating rod 44. An electrically conductive cylinder 46 is arranged in contact with the sliding sleeve on the upper end of the insulating rod. The electrically conductive section 45 and the electrically conductive cylinder 46 are connected in series to the dike extension control circuit 27. When the screw rod 6 rises to the limit position, the electrically conductive section 45 and the electrically conductive cylinder 46 are in contact and conductive.

[0055] In this way, the structure is simple, and the control is reliable.

[0056] The trigger switch 33 for starting the retraction of the spur dike comprises a spring switch contact rod connected in series in the control circuit for the retraction of the spur dike, and an insulating press rod 48 installed at the innermost end of the spur dike 3. When the spur dike 3 is fully retracted, the insulating press rod 48 and the spring switch contact rod abut and keep the spring switch contact rod in the normally open state. When the spur dike is extended, the insulating press rod moves away from the spring switch contact rod and the spring switch contact rod returns to the closed state.

[0057] Thus, the structure is simple and the control is reliable.

[0058] The trigger switch 36 for protecting the gate valve comprises a normally closed switch contact rod connected in series in the common line, and a press head 49 connected to the switch contact rod through a connecting rod and a spring. The front end of the press head 49 has an inclined surface located on the path of the extension of the front end of the spur dike, so that when the spur dike 3 is extended, the press head can be pushed by the inclined surface to open the switch contact rod.

[0059] In addition, in the implementation, the control circuit for the extension of the spur dike is further provided with a normally closed limit position limit switch 50 for the extension of the spur dike, which is installed on the dam body accommodating groove and can be in contact with the insulating press rod to be disconnected when the spur dike is extended to the limit position. Thus, the limit position of the extension of the spur dike can be better protected.

Claims

1. A flow detecting device for a river intake channel, said intake channel being a pipe structure having an intake opening at a position below the water surface of a river, characterized in that, The first water pressure receiving groove and the second water pressure receiving groove are arranged in communication on the top of the water taking channel, the first water pressure receiving groove is arranged on a large diameter reducing section which is formed by extending outwardly on the water taking channel, and the second water pressure receiving groove is arranged on a constant diameter section at one end of the reducing section; a piston plate in floating state is arranged in each of the first water pressure receiving groove and the second water pressure receiving groove, an upper end of the piston plate is fixedly arranged with a piston rod, the piston rod is located in a dark room, a vertical control laser lamp is arranged on the piston rod of the first water pressure receiving groove in vertical and parallel to the piston rod of the second water pressure receiving groove, and the control laser lamp is connected with a power supply; a vertical control photoelectric plate is arranged on the piston rod of the second water pressure receiving groove opposite to the control laser lamp.

2. The flow detecting device for the river water intake channel according to claim 1, wherein A third water pressure receiving groove which is symmetrical to the second water pressure receiving groove is arranged on the constant diameter section at the other end of the reducing section on the top of the water taking channel, the third water pressure receiving groove is arranged with a piston plate in floating state and a corresponding piston rod which are symmetrical to the piston plate and the piston rod in the second water pressure receiving groove, a vertical calibration laser lamp is symmetrically arranged on the piston rod of the first water pressure receiving groove on the side opposite to the control laser lamp, the piston rod of the third water pressure receiving groove is located in the dark room and arranged with a vertical calibration photoelectric plate opposite to the calibration laser lamp, the calibration photoelectric plate and the control photoelectric plate are symmetrically arranged, and the power output end of the calibration photoelectric plate and a calibration ammeter are connected in series to form a control loop.

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