A detector for speed measuring device of generator in hydropower plant

Abstract

The invention discloses a detector for a speed measuring device of a generator in a hydropower plant, comprising a placement plate, a toothed disc speed measuring device and a residual pressure speed measuring device, wherein a plurality of solid-state relays are connected and installed on the upper end of the placement plate, a sine signal generator is installed on the upper surface of the placement plate, a controller is installed on the outer wall of the placement plate, the solid-state relay is electrically connected to the toothed disc speed measuring device, the controller is electrically connected to the sine signal generator, and the detector comprises a conversion start mechanism, a limit mechanism and a locking mechanism; the sine signal generator is started by the controller, the conversion start mechanism is used to control the connection between the sine signal generator, the solid-state relay and the residual pressure speed measuring device, the solid-state relay is electrically connected to the toothed disc speed measuring device, so that the sine signal generator is electrically connected to the toothed disc speed measuring device, and the test frequency and rotation speed of the toothed disc are calculated by a formula, thereby achieving two effects.

Description

Technical Field

[0001] The invention relates to a speed measuring and detecting device. Background Art

[0002] The speed of the generator set in a hydropower plant is generally measured by a geared speed measuring device or a voltage transformer secondary voltage. The device for measuring the speed of the generator set provides the speed contact in the sequential control process of the generator set, the overspeed protection contact of the generator set, and the speed analog value of the monitoring system. Therefore, the speed measuring device is very important for the generator set and must be tested regularly to ensure its normal function. When troubleshooting the generator speed measurement system, it is necessary to quickly identify the fault location and repair or replace the components.

[0003] Most of the generator sets in hydropower plants have two speed measurement channels: gear speed measurement and residual pressure speed measurement. Existing instruments cannot simulate gear speed measurement signals and cannot easily convert gear speed measurement and residual pressure speed measurement, making it difficult to test gear speed measurement. Summary of the invention

[0004] The invention aims to overcome the defect that the speed measurement of a test gear disc is inconvenient and to provide a detector for a speed measuring device of a generator in a hydropower plant.

[0005] The technical scheme for achieving the above-mentioned purpose is: a detector for a speed measuring device of a generator in a hydropower plant, comprising a placement plate, a toothed disc speed measuring device and a residual pressure speed measuring device, a plurality of solid-state relays are connected and installed on the upper end of the placement plate, a sine signal generator is installed on the upper surface of the placement plate, a controller is installed on the outer wall of the placement plate, the solid-state relay is electrically connected to the toothed disc speed measuring device, the controller is electrically connected to the sine signal generator, and comprises a conversion start mechanism, a limit mechanism and a locking mechanism, and the conversion start mechanism is electrically connected to the sine signal generator;

[0006] A conversion start mechanism, the conversion start mechanism is arranged on the placement plate, and the conversion start mechanism is used to convert and start the toothed disc speed measuring device and the residual pressure speed measuring device;

[0007] A limiting mechanism, the limiting mechanism is arranged in the conversion start mechanism, and the limiting mechanism is used to limit the movement of the conversion start mechanism;

[0008] A locking mechanism is provided in the conversion and starting mechanism, and is used to fix the conversion and starting mechanism.

[0009] Preferably, the conversion starting mechanism includes a switch base, a nameplate, a turntable, a rotating shaft, a placement cavity, a rotating plate, a bearing plate, a residual pressure electric contact, a toothed disc speed measuring electric contact, a limit slot and a switch electric contact. A switch base is provided at the upper end of the placement plate, a placement cavity is provided inside the switch base, the inner wall of the placement cavity is rotatably connected to the rotating shaft, the top of the rotating shaft is connected to the turntable, the outer wall of the rotating shaft passes through the placement cavity, three nameplates are provided on the outer wall of the switch base, the outer wall of the rotating shaft is connected to the turntable, the bottom end of the rotating plate away from the rotating shaft is provided with a limit slot, the outer wall of the rotating plate is provided with a switch electric contact, the switch electric contact is electrically connected to the sinusoidal signal generator, and the inner wall of the placement cavity is connected to two symmetrically distributed bearing plates, one of which is provided with a residual pressure electric contact on the outer wall of the bearing plates, and the other is provided with a toothed disc speed measuring electric contact on the outer wall of the bearing plates.

[0010] Preferably, the limiting mechanism includes a guide rod, a limiting spring, a limiting block and an inclined surface, the inner wall of the placement cavity is movably inserted with a guide rod, the outer side of the guide rod is sleeved with a limiting spring, the bottom end of the guide rod is connected to the limiting block, one end of the limiting spring is connected to the upper inner wall of the placement cavity, the other end of the limiting spring is connected to the limiting block, the outer wall of the limiting block is provided with an inclined surface, and the bottom end of the limiting block is provided with a slot.

[0011] Preferably, the locking mechanism includes a push rod, a round rod, a round hole, a top block, a triangular plate, a first placement slot, a return spring, a connecting rod, a sliding slot, and a second placement slot, the inner wall of the placement cavity is provided with two first placement slots, the bottom end of the placement cavity is provided with a second placement slot, the two first placement slots are symmetrically distributed about the second placement slot, the outer wall of the first placement slot is provided with a sliding slot, the sliding slot is connected to the second placement slot, the inside of the first placement slot is connected with a return spring, the top end of the return spring is connected with a triangular plate, the outer wall of the triangular plate is connected with a connecting rod, the outer wall of the triangular plate is slidably connected to the first placement slot, the connecting rod is movably connected to the sliding slot, the inner wall of the second placement slot is slidably connected with a top block, the outer wall of the top block is connected to the connecting rod, the upper end of the top block is connected with a push rod, the top end of the push rod is connected with a round rod, and the outer wall of the switch base is provided with a round hole.

[0012] Preferably, the signal range of the sinusoidal signal generator is a sinusoidal signal of 0.01 Hz-2 MHz.

[0013] Preferably, the solid-state relay response frequency is 2000HZ.

[0014] Preferably, the distance between the first placement groove and the second placement groove is smaller than the width of the rotating plate, the length of the top block is larger than the length of the limiting groove, and the maximum distance between the limiting groove and the center of the rotating shaft is smaller than the maximum distance between the top block and the center of the rotating shaft.

[0015] Preferably, a pointer is provided at the upper end of the turntable, and the three nameplates correspond to the top block and the two bearing plates respectively.

[0016] The beneficial effects of the present invention are:

[0017] 1. Start the sine signal generator through the controller, use the conversion start mechanism to control the connection between the sine signal generator, the solid-state relay and the residual pressure speed measuring device, use the solid-state relay and the toothed disc speed measuring device to electrically connect the sine signal generator and the toothed disc speed measuring device, and expand the scope of use by replacing solid-state relays of different models. Read the reading on the sine signal generator. According to the formula, the frequency of the toothed disc speed measuring device = the tester frequency × the number of generator pole pairs / the number of toothed disc teeth, the speed of the toothed disc speed measuring device = the tester frequency × 60 / the number of toothed disc teeth, where the number of toothed disc teeth and the number of generator pole pairs are already indicated in the respective instruction manuals of the toothed disc and the generator, to calculate the test frequency and speed of the toothed disc, thereby achieving two effects.

[0018] 2. Write "Residual Pressure", "Gear Speed ​​Measurement" and "Stop" on the three nameplates respectively to let the user know the status of the turntable. Turn the turntable, the turntable drives the shaft to rotate, the shaft drives the turntable to rotate, and the turntable drives the switch electrical contacts to rotate, so that the switch electrical contacts can contact the residual pressure electrical contacts or the gear disc speed measurement electrical contacts, thereby generating an electrical connection, and then the electrical connection between the gear disc speed measurement device and the residual pressure speed measurement device and the sinusoidal signal generator can be controlled.

[0019] 3. Rotate the rotating plate to the top of the top block, that is, the pointer of the turntable rotates to the nameplate with "Stop". During this process, the rotating plate will squeeze the triangular plate, causing the triangular plate to move downward and squeeze the reset spring. At the same time, the triangular plate squeezes the connecting rod, and the connecting rod drives the top block to move downward. The distance between the first placement groove and the second placement groove is smaller than the width of the rotating plate, the length of the top block is larger than the length of the limiting groove, and the maximum distance between the limiting groove and the center of the rotating shaft is smaller than the maximum distance between the top block and the center of the rotating shaft. When the rotating plate squeezes the triangular plate, part of the bottom area of ​​the rotating plate can be located above the second placement groove of the top block. When the rotating plate no longer squeezes the triangular plate, the limiting groove is located above the second placement groove, and the reset spring pushes the triangular plate back to its original position, resets the top block, and snaps into the limiting groove, thereby fixing the position of the rotating plate to ensure that the rotating plate will not rotate at will. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of a top cross-sectional structure of the present invention;

[0022] Figure 3 It is a left-side cross-sectional structural schematic diagram of the present invention;

[0023] Figure 4 It is a right side cross-sectional structural schematic diagram of the present invention;

[0024] Figure 5 It is a schematic diagram of the internal cross-section top view of the structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the switch base of the present invention;

[0026] Figure 7 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 8 yes Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0028] Fig. 9 yes Figure 4 Schematic diagram of the enlarged structure at C in the middle;

[0029] Fig.10 yes Figure 5 Schematic diagram of the enlarged structure at D in the middle;

[0030] Fig.11 yes Figure 6 Schematic diagram of the enlarged structure at E in the middle.

[0031] 1. Placement plate; 2. Controller; 3. Sine signal generator; 4. Solid-state relay; 5. Conversion start mechanism; 501. Switch base; 502. Nameplate; 503. Turntable; 504. Rotating shaft; 505. Placement cavity; 506. Turntable; 507. Load-bearing plate; 508. Residual pressure electric contact; 509. Toothed disc speed measuring electric contact; 510. Limiting groove; 511. Switch electric contact; 6. Limiting mechanism; 601. Guide rod; 602. Limiting spring; 603. Limiting block; 604. Inclined surface; 7. Locking mechanism; 701. Push rod; 702. Round rod; 703. Round hole; 704. Top block; 705. Triangular plate; 706. First placement groove; 707. Reset spring; 708. Connecting rod; 709. Slide groove; 710. Second placement groove. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Reference Figure 1-11 A detector for a speed measuring device of a generator in a hydropower plant comprises a placement plate 1, a toothed disc speed measuring device and a residual pressure speed measuring device, a plurality of solid-state relays 4 are connected and installed on the upper end of the placement plate 1, a sine signal generator 3 is installed on the upper surface of the placement plate 1, a controller 2 is installed on the outer wall of the placement plate 1, the solid-state relay 4 is electrically connected to the toothed disc speed measuring device, the controller 2 is electrically connected to the sine signal generator 3, and comprises a conversion start mechanism 5, a limit mechanism 6 and a locking mechanism 7, the conversion start mechanism 5 is electrically connected to the sine signal generator 3, the response frequency of the solid-state relay 4 is 2000HZ, and the signal range of the sine signal generator 3 is a sine signal of 0.01Hz-2MHz;

[0035] A conversion start mechanism 5, which is arranged on the placement plate 1 and is used for conversion start of the toothed disc speed measuring device and the residual pressure speed measuring device;

[0036] A limiting mechanism 6, which is disposed in the conversion start mechanism 5 and is used to limit the movement of the conversion start mechanism 5;

[0037] The locking mechanism 7 is arranged in the conversion and starting mechanism 5 , and is used to fix the conversion and starting mechanism 5 .

[0038] The sine signal generator 3 is started by the controller 2, and the conversion starting mechanism 5 is used to control the connection between the sine signal generator 3, the solid-state relay 4 and the residual pressure speed measuring device. The solid-state relay 4 is electrically connected to the toothed disc speed measuring device, so that the sine signal generator 3 is electrically connected to the toothed disc speed measuring device. The solid-state relay 4 of different models is replaced to expand the scope of use. The reading on the sine signal generator 3 is read. According to the formula, the frequency of the toothed disc speed measuring device = the tester frequency × the number of generator pole pairs / the number of toothed disc teeth, the speed of the toothed disc speed measuring device = the tester frequency × 60 / the number of toothed disc teeth, wherein the number of toothed disc teeth and the number of generator pole pairs are indicated in the respective instruction manuals of the toothed disc and the generator, to calculate the test frequency and speed of the toothed disc, thereby achieving two effects. The limit mechanism 6 is used to limit the movement of the conversion starting mechanism 5, and the locking mechanism 7 is used to fix the conversion starting mechanism 5.

[0039] Reference Figure 1-8 The conversion start mechanism 5 includes a switch base 501, a nameplate 502, a turntable 503, a rotating shaft 504, a placement cavity 505, a rotating plate 506, a bearing plate 507, a residual pressure electric contact 508, a toothed disc speed measuring electric contact 509, a limit groove 510 and a switch electric contact 511. The switch base 501 is arranged at the upper end of the placement plate 1, and a placement cavity 505 is provided inside the switch base 501. The inner wall of the placement cavity 505 is rotatably connected with the rotating shaft 504. The top of the rotating shaft 504 is connected with the turntable 503. The outer wall of the rotating shaft 504 passes through the placement cavity 505. The outer wall of the switch base 501 is provided with three nameplates 502. The outer wall of the rotating shaft 504 is connected with the rotating plate 506. The rotating plate 506 A limit groove 510 is provided at the bottom end away from the rotating shaft 504, and a switch electric contact 511 is provided on the outer wall of the rotating plate 506. The switch electric contact 511 is electrically connected to the sinusoidal signal generator 3. The inner wall of the placement cavity 505 is connected to two symmetrically distributed supporting plates 507, and a residual pressure electric contact 508 is provided on the outer wall of one of the supporting plates 507, and a toothed disc speed measuring electric contact 509 is provided on the outer wall of the other supporting plate 507. A pointer is provided on the upper end of the rotating disk 503, and the three nameplates 502 correspond to the top block 704 and the two supporting plates 507 respectively. The residual pressure electric contact 508 is electrically connected to the residual pressure speed measuring device, and the solid-state relay 4 is electrically connected to the toothed disc speed measuring electric contact 509.

[0040] Write "Residual Pressure", "Gear Speed ​​Measurement" and "Stop" on the three nameplates 502 respectively to let the user know the status of the turntable 506. Turn the turntable 503, the turntable 503 drives the rotating shaft 504 to rotate, the rotating shaft 504 drives the turntable 506 to rotate, and the turntable 506 drives the switch electric contact 511 to rotate, so that the switch electric contact 511 can contact the residual pressure electric contact 508 or the gear speed measurement electric contact 509, thereby generating an electrical connection, and then the electrical connection between the gear speed measurement device and the residual pressure speed measurement device and the sinusoidal signal generator 3 can be controlled.

[0041] Reference Figure 7-11 The limiting mechanism 6 includes a guide rod 601, a limiting spring 602, a limiting block 603 and an inclined surface 604. The inner wall of the placement cavity 505 is movably inserted with a guide rod 601, and the outer side of the guide rod 601 is sleeved with a limiting spring 602. The bottom end of the guide rod 601 is connected to the limiting block 603, one end of the limiting spring 602 is connected to the upper inner wall of the placement cavity 505, and the other end of the limiting spring 602 is connected to the limiting block 603. The outer wall of the limiting block 603 is provided with an inclined surface 604, and the bottom end of the limiting block 603 is provided with a slot.

[0042] When the rotating plate 506 rotates to the point of being in contact with the two bearing plates 507, the inclined surface 604 will be squeezed, and then the limit block 603 will move upward and squeeze the limit spring 602, the rotating plate 506 will be stuck in the slot, and the limit spring 602 will be squeezed downward, so that the rotating plate 506 cannot rotate, ensuring that the switch electrical contact 511 will not be accidentally disconnected when contacting the residual pressure electrical contact 508 or the geared speed measuring electrical contact 509. It is only necessary to pull the guide rod 601 upward to pull the limit block 603 above the rotating plate 506, and then rotate the rotating plate 506 to disengage.

[0043] Reference Figure 7-11 The locking mechanism 7 includes a push rod 701, a round rod 702, a round hole 703, a top block 704, a triangular plate 705, a first placement groove 706, a return spring 707, a connecting rod 708, a slide groove 709 and a second placement groove 710. The inner wall of the placement cavity 505 is provided with two first placement grooves 706, and the bottom end of the placement cavity 505 is provided with a second placement groove 710. The two first placement grooves 706 are symmetrically distributed about the second placement groove 710. The outer wall of the first placement groove 706 is provided with a slide groove 709, and the slide groove 709 is connected to the second placement groove 710. The interior of the first placement groove 706 is connected with a return spring 707, and the top of the return spring 707 is connected with the triangular plate 705. The triangular plate 705 The outer wall of the switch base 501 is connected with a connecting rod 703, the outer wall of the triangular plate 705 is slidably connected with the first placement groove 706, the connecting rod 708 is movably connected with the sliding groove 709, the inner wall of the second placement groove 710 is slidably connected with the top block 704, the outer wall of the top block 704 is connected with the connecting rod 708, the upper end of the top block 704 is connected with a push rod 701, the top end of the push rod 701 is connected with a round rod 702, and the outer wall of the switch base 501 is provided with a circular hole 703, the spacing between the first placement groove 706 and the second placement groove 710 is smaller than the width of the rotating plate 506, the length of the top block 704 is larger than the length of the limiting groove 510, and the maximum spacing between the limiting groove 510 and the center of the rotating shaft 504 is smaller than the maximum spacing between the top block 704 and the center of the rotating shaft 504.

[0044] When the conversion start mechanism 5 is not needed, the rotating plate 506 is rotated to the top of the top block 704, that is, the pointer of the turntable 503 is rotated to the nameplate 502 with "Stop". In this process, the rotating plate 506 will squeeze the triangular plate 705, so that the triangular plate 705 moves downward and squeezes the reset spring 707. At the same time, the triangular plate 705 squeezes the connecting rod 708, and the connecting rod 708 drives the top block 704 to move downward. The distance between the first placement groove 706 and the second placement groove 710 is smaller than the width of the rotating plate 506, and the length of the top block 704 is greater than the length of the limit groove 510. The maximum distance between the positioning groove 510 and the center of the rotating shaft 504 is smaller than the maximum distance between the top block 704 and the center of the rotating shaft 504, so that when the rotating plate 506 squeezes the triangular plate 705, a part of the bottom area of ​​the rotating plate 506 can be located above the second positioning groove 710 of the top block 704. When the rotating plate 506 is no longer squeezing the triangular plate 705, the limiting groove 510 is located above the second positioning groove 710, and the reset spring 707 pushes the triangular plate 705 back to its original position, so that the top block 704 is reset and snapped into the limiting groove 510, thereby fixing the position of the rotating plate 506 and ensuring that the rotating plate 506 will not rotate at will.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detector for a speed measuring device of a generator in a hydropower plant, comprising a placement plate (1), a toothed disc speed measuring device and a residual pressure speed measuring device, characterized in that: A plurality of solid-state relays (4) are connected and mounted on the upper end of the placement plate (1), a sine signal generator (3) is mounted on the upper surface of the placement plate (1), a controller (2) is mounted on the outer wall of the placement plate (1), the solid-state relays (4) are electrically connected to the gear disc speed measuring device, the controller (2) is electrically connected to the sine signal generator (3), and comprises a conversion start mechanism (5), a limit mechanism (6) and a locking mechanism (7), and the conversion start mechanism (5) is electrically connected to the sine signal generator (3); A conversion start mechanism (5), the conversion start mechanism (5) being arranged on the placement plate (1), the conversion start mechanism (5) being used to conversion start the toothed disc speed measuring device and the residual pressure speed measuring device; A limiting mechanism (6), wherein the limiting mechanism (6) is arranged in the conversion start mechanism (5), and the limiting mechanism (6) is used to limit the movement of the conversion start mechanism (5); A locking mechanism (7), wherein the locking mechanism (7) is arranged in the conversion start mechanism (5), and the locking mechanism (7) is used to fix the conversion start mechanism (5); The switching start mechanism (5) comprises a switch base (501), a nameplate (502), a rotating disk (503), a rotating shaft (504), a placement cavity (505), a rotating plate (506), a bearing plate (507), a residual pressure electric contact (508), a toothed disk speed measuring electric contact (509), a limit groove (510) and a switch electric contact (511); the switch base (501) is arranged at the upper end of the placement plate (1); a placement cavity (505) is provided inside the switch base (501); the inner wall of the placement cavity (505) is rotatably connected to the rotating shaft (504); the top end of the rotating shaft (504) is connected to the rotating disk (503); the outer wall of the rotating shaft (504) passes through the placement cavity (505); 5), the outer wall of the switch base (501) is provided with three nameplates (502), the outer wall of the rotating shaft (504) is connected with a rotating plate (506), the bottom end of the rotating plate (506) away from the rotating shaft (504) is provided with a limiting groove (510), the outer wall of the rotating plate (506) is provided with a switch electric contact (511), the switch electric contact (511) is electrically connected to the sine signal generator (3), the inner wall of the placement cavity (505) is connected with two symmetrically distributed bearing plates (507), the outer wall of one of the bearing plates (507) is provided with a residual pressure electric contact (508), and the outer wall of the other bearing plate (507) is provided with a toothed disc speed measurement electric contact (509); The limiting mechanism (6) comprises a guide rod (601), a limiting spring (602), a limiting block (603) and an inclined surface (604); the inner wall of the placement cavity (505) is movably inserted with the guide rod (601); the outer side of the guide rod (601) is sleeved with a limiting spring (602); the bottom end of the guide rod (601) is connected to the limiting block (603); one end of the limiting spring (602) is connected to the upper inner wall of the placement cavity (505); the other end of the limiting spring (602) is connected to the limiting block (603); the outer wall of the limiting block (603) is provided with an inclined surface (604); and the bottom end of the limiting block (603) is provided with a slot; The locking mechanism (7) comprises a push rod (701), a round rod (702), a round hole (703), a top block (704), a triangular plate (705), a first placement groove (706), a return spring (707), a connecting rod (708), a sliding groove (709) and a second placement groove (710); the inner wall of the placement cavity (505) is provided with two first placement grooves (706); the bottom end of the placement cavity (505) is provided with a second placement groove (710); the two first placement grooves (706) are symmetrically distributed with respect to the second placement groove (710); the outer wall of the first placement groove (706) is provided with a sliding groove (709); the sliding groove (709) is connected to the second placement groove (710); the first placement groove A reset spring (707) is connected inside (706), the top end of the reset spring (707) is connected to a triangular plate (705), the outer wall of the triangular plate (705) is connected to a connecting rod (708), the outer wall of the triangular plate (705) is slidably connected to the first placement groove (706), the connecting rod (708) is movably connected to the slide groove (709), the inner wall of the second placement groove (710) is slidably connected to a top block (704), the outer wall of the top block (704) is connected to the connecting rod (708), the upper end of the top block (704) is connected to a push rod (701), the top end of the push rod (701) is connected to a round rod (702), and the outer wall of the switch base (501) is provided with a round hole (703).

2. A hydropower plant generator speed measuring device detector according to claim 1, characterized in that: The signal range of the sine signal generator (3) is a sine signal of 0.01 Hz-2 MHz.

3. A detector for speed measuring device of a hydropower plant generator according to claim 1, characterized in that: The solid-state relay (4) has a response frequency of 2000 Hz.

4. A hydropower plant generator speed measuring device detector according to claim 1, characterized in that: The distance between the first placement groove (706) and the second placement groove (710) is smaller than the width of the rotating plate (506), the length of the top block (704) is larger than the length of the limiting groove (510), and the maximum distance between the limiting groove (510) and the center of the rotating shaft (504) is smaller than the maximum distance between the top block (704) and the center of the rotating shaft (504).

5. A hydropower plant generator speed measuring device detector according to claim 1, characterized in that: A pointer is provided at the upper end of the rotating disk (503), and the three nameplates (502) correspond to the top block (704) and the two bearing plates (507) respectively.

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