Position contact detection device for main servomotor of speed regulation system

Abstract

A speed regulation system main servomotor position contact detection device comprises a switch box and a rotating shaft arranged on one side of the switch box, the rotating shaft is connected with a rotating block, an arc-shaped swing rod is arranged on the rotating block, and idler wheels are arranged at the two ends of the arc-shaped swing rod; the switch box is fixedly connected with the U-shaped plate through a metal block. According to the speed regulation system main servomotor position contact detection device, the swing rod of the limit switch does not need to be stressed and collided for a long time, and the practical service life is long. When the limit switch needs to be replaced or the installation position needs to be moved, only the screws on the back face of the U-shaped metal plate need to be loosened on the kidney-shaped holes, and operation is simple and fast.

Description

Technical Field

[0001] The utility model relates to the technical field of governor of hydro-generating unit, in particular to a position contact detection device for the main servomotor of a speed regulation system. Background Art

[0002] The opening degree of the movable guide vane of the governor of the hydro-generating unit is measured by measuring the linear displacement of the main servomotor. Position switch contacts such as fully open, no-load and below, and fully closed of the guide vane are installed on the linear displacement of the metal part with the same stroke of the main servomotor. The current detection of the position contact of the main servomotor is as Figure 1 shown, and a limit switch of the over-travel ball swing rod type is adopted, as Figure 2 shown; when the guide vane of the unit moves in the closing direction, the linear displacement of the main servomotor is as Figure 3 shown, and the metal pressing plate linearly displaces to the right synchronously with the main servomotor. The limit switch is touched by the metal pressing plate, and the contact of the limit switch reverses, thereby outputting a corresponding switching signal. When the guide vane of the unit moves in the opening direction, the metal pressing plate linearly displaces to the left synchronously with the main servomotor, and the contact of the limit switch returns.

[0003] The current action of the position contact of the main servomotor is as Figure 3 shown. When the guide vane is in the fully closed position, the fully open, no-load and below, and fully closed contacts are always in a stressed state, which greatly affects the service life of the limit switch. Since the daily maintenance of the position contact of the main servomotor is carried out when the unit is shut down and the guide vane is fully closed, it is difficult to disassemble, install and displace the limit switch under the condition that the swing rod is stressed.

[0004] In addition, the limit switch of the current position contact of the main servomotor is directly installed on the fixed metal plate, and it is difficult to adjust the installation position as required. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a position contact detection device for the main servomotor of a speed regulation system, the limit switch is convenient for maintenance, the installation position is convenient for adjustment, and the swing rod of the limit switch can accurately and reliably detect without being stressed for a long time.

[0006] To solve the above technical problem, the technical solution adopted by the utility model is: a position contact detection device for the main servomotor of a speed regulation system, which includes a switch box and a rotating shaft arranged on one side of the switch box. The rotating shaft is connected with a rotating block, an arc swing rod is arranged on the rotating block, and rollers are arranged at both ends of the arc swing rod; the switch box is fixedly connected with a U-shaped plate through a metal block.

[0007] Preferably, an installation groove is arranged on the U-shaped plate, and a first installation hole and a second installation hole for connecting with the U-shaped plate and the switch box are arranged on the metal block.

[0008] Preferably, the two ends of the U-shaped plate are provided with flips, and the metal block is placed between the two flips.

[0009] The utility model provides a detection device for the position contact point of the main servomotor of a speed regulation system. The swing rod of the limit switch does not need to be stressed and collided for a long time, and the service life is long. When it is necessary to replace the limit switch or move the installation position, it can be completed simply and quickly by loosening the screws on the back of the U-shaped metal plate on the waist hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following further describes the utility model with reference to the drawings and embodiments:

[0011] Figure 1 It is a diagram of the current monitoring method for the position contact point of the main servomotor;

[0012] Figure 2 It is a limit switch of the over-travel ball swing rod type;

[0013] Figure 3 It is a diagram of the action state of the current position contact point of the main servomotor;

[0014] Figure 4 It is a schematic structural diagram of the utility model;

[0015] Figure 5 It is a schematic structural diagram of the U-shaped plate of the utility model;

[0016] Figure 6 It is a schematic structural diagram of the metal block of the utility model;

[0017] Figure 7 It is a schematic structural diagram of the cooperation between the metal block and the U-shaped plate of the utility model;

[0018] Figure 8 It is a schematic structural diagram of the limit switch of the position contact point of the main servomotor of the utility model before action;

[0019] Figure 9 It is a schematic structural diagram of the limit switch of the position contact point of the main servomotor of the utility model after action. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] As Figure 4 shown, a detection device for the position contact point of the main servomotor of a speed regulation system includes a switch box 1 and a rotating shaft 2 provided on one side of the switch box 1. The rotating shaft 2 is connected to a rotating block 3, and an arc-shaped swing rod 4 is provided on the rotating block 3. Both ends of the arc-shaped swing rod 4 are provided with rollers 5; the switch box 1 is fixedly connected to a U-shaped plate 7 through a metal block 6.

[0021] Preferably, as Figure 5 , 6As shown, an installation groove 8 is provided on the U-shaped plate 7, and a first installation hole 9 and a second installation hole 10 for connecting with the U-shaped plate 7 and the switch box 1 are provided on the metal block 6.

[0022] Preferably, as Figure 7 shown, flips 11 are provided at both ends of the U-shaped plate 7, and the metal block 6 is placed between the two flips 11.

[0023] During use, as Figure 8 shown, when the stop block touches the swing rod, the swing rod deflects 90°, the output of the switch quantity contact will reverse, and it will continue to maintain the reversed state after the stop block passes. Only when the stop block passes in the reverse direction and touches the swing rod again, the swing rod deflects 90° back, and the output of the switch quantity contact returns to the initial state.

[0024] When the guide vane of the unit moves in the closing direction, the linear displacement of the main servomotor is as Figure 9 shown, the metal stop block linearly displaces synchronously with the main servomotor in the right direction. By touching the limit switch with the metal stop block, the contact of the limit switch reverses, thereby outputting a corresponding switch quantity signal. As Figure 9 shown, when the guide vane of the unit moves in the opening direction, the metal stop block linearly displaces synchronously with the main servomotor in the right direction. By touching the limit switch in the reverse direction with the metal stop block, the contact of the limit switch returns.

[0025] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A main servomotor position contact detection device for a speed regulation system, comprising a switch box (1) and a rotating shaft (2) arranged on one side of the switch box (1), characterized in that: The rotating shaft (2) is connected to the rotating block (3). An arc-shaped swing rod (4) is provided on the rotating block (3), and rollers (5) are provided at both ends of the arc-shaped swing rod (4); the switch box (1) is fixedly connected to the U-shaped plate (7) through a metal block (6).

2. The main servomotor position contact detection device for a speed regulation system according to claim 1, characterized in that: An installation groove (8) is provided on the U-shaped plate (7). A first installation hole (9) and a second installation hole (10) for connecting the U-shaped plate (7) and the switch box (1) are provided on the metal block (6).

3. The main servomotor position contact detection device of a speed regulation system according to claim 2, characterized in that: Flaps (11) are provided at both ends of the U-shaped plate (7), and the metal block (6) is placed between the two flaps (11).

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