Retractable limiting device for hydropower station

Abstract

The utility model discloses a retractable limiting device for a hydropower station, which relates to the field of automatic element installation control and comprises a control part and a limiting device part, the control part comprises a control box and an electrical junction box, and the limiting device part comprises a stepping motor sliding table and a limiting switch. The control box is arranged on one side of the stepping motor sliding table, and the limiting device part and the control part are arranged on the mounting bottom plate. According to the utility model, the sliding table stably stretches out and draws back through the stepping motor to control the limiting switch to move back and forth, so that the feedback limiting device can feed back whether the large shaft moves to an accurate position or not, a safe distance between the large shaft and the feedback limiting device can be kept in the operation process of the large shaft, and the operation safety of the water wheel motor is improved. Meanwhile, control element units such as a stepping motor controller and a switching power supply are all centrally controlled in the control box, and an external electrical interface is an electrical junction box, so that the whole limiting device has the advantages of small size and convenience in wiring control.

Description

Technical Field

[0001] The utility model relates to the field of automatic component installation control, in particular to a retractable limiting device of a hydropower station. Background Art

[0002] The top rotor system is a conventional auxiliary equipment for vertical hydro-turbine generators. Whether the top rotor limit device is installed properly will affect the safe operation of the unit. Generally, the top rotor limit device adopts a limit switch and is installed near the top of the main shaft or the water-generating coupling shaft where it is easy to install. However, most of the existing auxiliary limit devices are set in a fixed position. Although they have the effect of feedback limit, there is a hidden danger of interfering with the normal operation of the unit. Therefore, a new limit device is urgently needed to solve this hidden danger.

[0003] Chinese patent document CN205779425U discloses "a limit switch device for the top rotor of a hydro-turbine generator". The rotor and the turbine unit are used for construction. The rotor is provided with a longitudinal adjustment support plate, and a transverse adjustment support plate is fixed on the upper end of the longitudinal adjustment support plate. The outer end of the transverse adjustment support plate is provided with a travel switch, and the travel switch is distributed transversely. The rotor rises along the outer wall of the turbine unit. However, the limit device in the patent cannot be freely extended and adjusted. Summary of the invention

[0004] The utility model mainly solves the technical problem that the limit device of the original top rotor cannot adjust the position, and provides a retractable limit device for a hydropower station. The limit device is installed on a stepper motor slide, and the operation of the stepper motor slide is controlled by a control box and an electrical junction box. On the basis of ensuring that the limit device realizes the limit, the limit switch in the limit device is driven to always maintain a safe distance from the main shaft of the hydro-generator.

[0005] The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: the utility model includes a control part and a limit device part, the control part includes a control box and an electrical junction box, the limit device part includes a stepper motor slide and a limit switch, the control box is arranged on one side of the stepper motor slide, and the limit device part and the control part are arranged on a mounting base plate.

[0006] Preferably, the limit switch is an adjustable ball rocker type limit switch, comprising a switch arm and a switch seat, one side of the switch arm is arranged on the edge of the switch seat, and a trigger switch is arranged in the switch seat.

[0007] Preferably, a limit switch mounting plate is provided above the stepper motor slide, the limit switch is arranged above the limit switch mounting plate, and the limit switch mounting plate is installed above the stepper motor slide.

[0008] Preferably, the electrical junction box is arranged on one side of the control box, a plurality of connection terminals are arranged in the electrical junction box, and the connection terminals are connected to the limit device part through the control box.

[0009] Preferably, a motor and a slide rail are provided in the stepper motor slide, a sliding gear is provided between the motor and the slide rail, and a position feedback element is also provided in the stepper motor slide, and the position feedback element is connected to the electrical junction box.

[0010] Preferably, a mounting base plate is provided at the bottom end of the stepper motor slide and the control box.

[0011] Preferably, a rotating shaft is provided at the connection between the switch arm and the switch seat.

[0012] Preferably, a large shaft is provided on one side of the limit device, and a gap equidistant between the large shaft and the trigger switch is provided within the movable range of the stepping motor slide.

[0013] The beneficial effects of the utility model are as follows: the utility model controls the limit switch to move forward and backward through the stepper motor slide to smoothly extend and retract, and ensures that the feedback limit device can feedback whether the main shaft moves to the correct position, and can also maintain a safe distance from the main shaft during operation, thereby improving the safety of the operation of the water turbine motor. At the same time, the stepper motor controller and the switch power supply and other control element units are all centralized and controlled in the control box, and the external electrical interface is an electrical junction box, so that the entire limit device has the advantages of small size and convenient control wiring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view of a retractable limiting device of the utility model.

[0015] Figure 2 It is a front view of a retractable limiting device of the utility model.

[0016] Figure 3 It is a left view of a retractable limiting device of the utility model.

[0017] Figure 4 The utility model is a structural diagram of an electrical junction box.

[0018] Figure 5 The utility model is a state diagram of a retractable limiting device being extended.

[0019] Figure 6 This is a state diagram of a retractable limiting device of the utility model being withdrawn.

[0020] Figure 7 This is a state diagram of a retractable limiting device of the utility model with the main shaft lifted into position.

[0021] In the figure, 1. installation base plate, 2. stepper motor slide, 3. control box, 4. limit switch installation plate, 5. limit switch, 6. electrical junction box, 7. large shaft. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] Embodiment 1: A retractable limit device of a hydropower station in this embodiment, the top rotor system is a conventional auxiliary equipment of a vertical hydro-turbine generator. Whether the limit device of the top rotor is installed reasonably will affect the safe operation of the unit. Generally, the limit device of the top rotor adopts a limit switch, which is installed at the top of the main shaft 7 or near the water-generating coupling shaft, which is convenient for installation. The installation clearance between the limit switch and the main shaft 7 component is generally about 10mm to 15mm, and the design clearance at the position of the anti-wear ring of the turbine is generally about 15mm to 20mm. Due to structural reasons, the design clearance at the position of the anti-wear ring of the turbine will be greater than the height of the top rotor system to lift the rotor. The hydro-turbine generator will lift the machine under some working conditions, which will cause the maximum lifting height of the hydro-turbine generator to exceed the height of the top rotor when the hydro-turbine generator rotates at high speed, that is, it exceeds the clearance between the limit switch and the main shaft 7 component. Under the condition of high-speed rotation of the unit, the main shaft 7 component contacts the limit switch, which will cause damage to the limit switch, and even cause the limit switch to be damaged, affecting the safe operation of the unit. In order to solve the above hidden dangers, most existing solutions use non-contact electrical component measurement and other methods to ensure that the main shaft 7 components operate within the appropriate range. However, non-contact electrical components cannot accurately feedback whether the main shaft 7 operates within the specified range, and cannot replace mechanical limit switches in terms of action reliability and anti-interference. In terms of visualization, they cannot intuitively feedback whether the main shaft 7 components are within the safe operating range like mechanical limit switches, and thus cannot ensure the safe operation of the unit. Even if non-contact electrical component measurement is configured, a mechanical limit switch still needs to be installed for auxiliary judgment.

[0024] Therefore, this embodiment provides a controllable telescopic limit device for a hydropower station, such as Figures 1 to 3As shown, the limit device in this embodiment includes a mounting base plate 1, a stepper motor slide 2, and a control box 3, and also includes a limit switch mounting plate 4, a limit switch 5, and an electrical junction box 6. The limit switch 5 is mounted above the stepper motor slide 2 through the limit switch mounting plate 4, the switch arm and the trigger switch on the limit switch are arranged on the switch seat, the switch seat is arranged on the mounting base plate, the trigger switch is connected to the switch seat through the switch arm, the entire limit switch is arranged on the edge of the mounting plate, and the mounting plate is arranged above the stepper motor slide. In this way, it is ensured as much as possible that the swing arm of the limit switch can leave the stepper motor slide when extended and be above the large shaft 7 component, and at the same time, the technical purpose of completing the limit with a small volume limit switch can be achieved, the overall volume of the limit switch is reduced, and the manufacturing cost is reduced. At the same time, a rotating shaft is provided between the switch arm and the switch seat. When the trigger switch contacts the lifted shaft 7 component, the switch arm is prompted to rotate and the position feedback element detects the angle of the switch arm to rotate and feedback whether the shaft 7 component is lifted to the right position, thereby improving the accuracy of the position limit of the limit switch, and further reducing the force on the shaft 7 component when it is lifted, thereby extending the service life of the limit switch. The control box 3 is provided with control unit components such as a stepper motor controller and a switch power supply. The stepper motor slide 2 is controlled by the control box 3 to drive the limit switch mounting plate 4 and the limit switch 5 to extend or retract. All wiring is led to the electrical junction box 6, which is convenient for electrical connection with external equipment. The stepper motor slide is built with a motor and a slide rail. A sliding gear is provided between the motor and the slide rail. When the limit switch needs to execute the command of extending or retracting, the motor operates to drive the sliding gear to operate on the slide rail, thereby driving the limit switch mounting plate to extend or retract, and the limit switch is arranged on the limit switch mounting plate, so that the extension or retraction of the limit switch is finally realized. Therefore, the limit switch 5 of the limit device in this embodiment can be extended or retracted through the stepper motor slide 2. The position feedback element inside the stepper motor slide 2 will send a signal that the limit switch 5 is in the input position or the withdrawal position, and the signal is led to the electrical junction box 6. The stepper motor slide 2, the control box 3 and the electrical junction box 6 are all integrated and installed on a mounting base plate 1. The extension and retraction functions of the limit switch 5 can be controlled. The control element units such as the stepper motor controller and the switching power supply are all centralized and controlled in the control box 3, and the external electrical interface is the electrical junction box 6, which achieves the purpose of small size and convenient control as a whole.

[0025] When the turbine generator rotates, the limit switch on the limit device retracts and moves away from the rotating parts of the main shaft 7. At this time, even if the unit is lifted, it will not touch the limit device. When the unit needs to lift the rotor after shutdown, the limit switch on the limit device extends out. When the rotor reaches a predetermined height, the limit switch is triggered and a signal that the rotor has reached the desired height is issued. The limit switch on the limit device is mechanical, with obvious on and off functions, safe and reliable, which can reduce costs as much as possible and also improve the safety of the unit operation as much as possible.

[0026] like Figure 4 As shown, in this embodiment, 10 terminals are provided in the electrical junction box, and the terminals 1 and 2 are connected to the positive and negative poles of the power supply, and the connected power supply provides power support for the entire limit device; the terminal 3 is set as the control terminal of the extension command, and the electrical junction box issues a forward extension command to the limit switch through the control box through the terminal; the terminal 4 is set as the common terminal, which is defined as the common connection part; the terminal 5 is set as the control terminal of the retraction command, and the electrical junction box issues a backward retraction command to the limit switch through the control box through the terminal; the terminals 6 and 7 are set as the position signal feedback terminals, and the limit switch feeds back the real-time position of the limit switch to the electrical junction box through the position feedback element, so as to ensure that the electrical junction box issues an accurate control command; the terminal 8 is the retraction control terminal. Return to position signal feedback end, when the limit switch receives the retraction command from the electrical junction box, the limit switch retracts backwards under the action of the stepper motor slide, and when the limit switch is retracted, a return signal is sent to the electrical junction box through terminal 8, prompting the electrical junction box to stop controlling the limit switch to retract; terminal 9 is the COM end; terminal 10 is the extended position signal feedback end, when the limit switch receives the retraction command from the electrical junction box, the limit switch extends forward under the action of the stepper motor slide, and when the limit switch is extended, a extend position signal is sent to the electrical junction box through terminal 8, prompting the electrical junction box to stop controlling the limit switch to extend, thereby preventing the stepper motor slide from continuing to operate even after completing its purpose, thereby reducing the service life of the stepper motor slide.

[0027] like Figures 5 to 7As shown, the electrically controlled retractable limit switch device in this embodiment includes a stepper motor slide 2, a control box 3, a limit switch mounting plate 4, and also includes a limit switch 5 and an electrical junction box 6. The above parts are integrated on a mounting plate 1, and the limit switch 5 can move linearly to achieve the extension and retraction functions under the sliding of the stepper motor slide 2. The limit switch 5 is installed above the stepper motor slide 2 through the limit switch mounting plate 4. The stepper motor slide 2 is controlled by the control box 3 to drive the limit switch mounting plate 4 and the limit switch 5 to extend or retract. The position feedback element inside the stepper motor slide 2 will send a signal that the limit switch 5 is in the extended position or the retracted position, and the wire is connected to the electrical junction box 6. When in use, after the vertical hydro-turbine generator has been shut down for a long time, a top rotor is required to establish an oil film for the thrust pad. The top rotor operation needs to be performed before starting. After receiving the command signal of the rotor limit device extending from the external device, the connection terminals 3 and 4 of the electrical junction box 6 of the utility model are connected, and the control box 3 makes a logical judgment control through the signal transmitted by the electrical junction box 6, so that the stepper motor slide 2 slides toward the main shaft 7 of the unit, driving the limit switch mounting plate 4 and the limit switch 5 to extend. The position feedback element inside the stepper motor slide 2 operates, and the connection terminals 9 and 10 of the electrical junction box 6 are connected, indicating that the utility model is extended into place. At this time, the main shaft 7 can be pushed up by the action of equipment other than the high-pressure oil pump of the utility model, and the limit switch of the utility model is actuated, and the connection terminals 6 and 7 of the electrical junction box 6 are connected, indicating that the limit switch has been actuated and the rotor has been pushed up into place. When the top rotor is completed, the external device sends a retraction command signal, the wiring terminal 4 and the wiring terminal 5 of the electrical junction box 6 of the utility model are connected, the control box 3 makes a logical judgment control through the signal transmitted by the electrical junction box 6, and the stepper motor slide 2 slides in the opposite direction of the unit shaft 7, driving the limit switch mounting plate 4 and the limit switch 5 to retract. Figure 5 The status becomes Figure 6In the state, away from the main shaft 7, the position feedback element inside the stepper motor slide 2 is activated, and the terminal 8 and the terminal 9 of the electrical junction box 6 are connected, indicating that the limit device is retracted. In this state, even if the main shaft 7 is lifted too high, it will not touch the limit device in this embodiment, solving the safety problem when the unit rotates at high speed. The actuator in this embodiment is driven by AC220V conventional power supply, and moves smoothly through the stepper motor slide, which has the advantages of controllability, safety and reliability, and long service life. At the same time, the control element units such as the stepper motor controller and the switching power supply are all centralized and controlled in the control box 3, and the external electrical interface is the electrical junction box 6, which has the characteristics of small size and convenient control wiring. The limit device in this embodiment has a built-in position feedback signal for feedback of the extended state or retracted state of the utility model. It can feedback the position of the limit switch, and the function is relatively complete. It can not only realize the technical effect of limiting the main shaft 7 components intuitively and concisely, but also ensure that it maintains a safe distance with the main shaft 7 components through the extension of the limit switch, thereby improving the safety of the unit.

[0028] Embodiment 2: In this embodiment, a controllable telescopic limit device for a hydropower station includes a control part and a limit device part. The control part includes a control box and an electrical junction box. The limit device part includes a stepper motor slide and a limit switch. The limit switch is an adjustable ball rocker type limit switch, including a switch arm and a switch seat. One side of the switch arm is arranged at the edge of the switch seat. A rotating shaft is arranged at the connection between the switch arm and the switch seat. A trigger switch is arranged in the switch seat. The control box is arranged on one side of the stepper motor slide. The limit device part and the control part are arranged on the mounting bottom plate. The electrical junction box is arranged on one side of the control box. A plurality of wiring terminals are arranged in the electrical junction box. The wiring terminals are connected to the limit device part through the control box. A limit switch mounting plate is arranged above the stepper motor slide. The limit switch is arranged above the limit switch mounting plate. The limit switch mounting plate is installed on the edge of the stepper motor slide. A motor and a slide rail are arranged inside the limit switch mounting plate. A sliding gear is arranged between the motor and the slide rail. A position feedback element is also arranged in the stepper motor slide. The position feedback element is connected to the electrical junction box. The bottom of the stepper motor slide and the control box is provided with a mounting base plate. In this embodiment, 10 wiring terminals are provided in the electrical junction box, and wiring terminals 1 and 2 are connected to an AC power supply, and the AC power supply is connected to provide power support for the entire limit device.

Claims

1. A retractable limit device for a hydropower station, characterized in that: It includes a control part and a limit device part, the control part includes a control box and an electrical junction box, the limit device part includes a stepper motor slide and a limit switch, the control box is arranged on one side of the stepper motor slide, and the limit device part and the control part are arranged on a mounting base plate.

2. A retractable limiting device for a hydropower station according to claim 1, characterized in that: The limit switch is an adjustable ball rocker type limit switch, comprising a switch arm and a switch seat, one side of the switch arm is arranged at the edge of the switch seat, and a trigger switch is arranged in the switch seat.

3. A retractable limiting device for a hydropower station according to claim 1 or 2, characterized in that: A limit switch mounting plate is provided above the stepper motor slide, the limit switch is arranged above the limit switch mounting plate, and the limit switch mounting plate is mounted on the edge of the stepper motor slide.

4. A retractable limiting device for a hydropower station according to claim 1, characterized in that: The electrical junction box is arranged at one side of the control box. A plurality of connection terminals are arranged in the electrical junction box. The connection terminals are connected to the limit device part through the control box.

5. The retractable limiting device of a hydropower station according to claim 3, characterized in that: A motor and a slide rail are arranged in the stepper motor slide, a sliding gear is arranged between the motor and the slide rail, and a position feedback element is also arranged in the stepper motor slide, and the position feedback element is connected to the electrical junction box.

6. A retractable limiting device for a hydropower station according to claim 4, characterized in that: The bottom ends of the stepper motor slide and the control box are provided with a mounting base plate.

7. A retractable limiting device for a hydropower station according to claim 2, characterized in that: A rotating shaft is provided at the connection between the switch arm and the switch seat.

8. The retractable limiting device of a hydropower station according to claim 1, characterized in that: A large shaft is provided on one side of the limit device, and a gap equidistant from the large shaft and the trigger switch is provided within the movable range of the stepping motor slide.

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