Elastic force detection device for volute spiral spring of generator

Abstract

The invention discloses an elastic force detection device for a volute spiral spring of a generator, which comprises a U-shaped detection frame (1), the volute spiral spring (2) and a carbon brush (3) are arranged on a U-shaped groove of the U-shaped detection frame (1), the outer end of the volute spiral spring (2) is fixedly connected to the U-shaped detection frame (1), the carbon brush (3) is slidably connected to the U-shaped groove and abuts against the volute spiral spring (2), a winding roller (41) is arranged on the U-shaped detection frame (1) and above the carbon brush (3), and the winding roller (41) is connected with the U-shaped detection frame (1). A fixed pulley (42) is arranged above the volute spiral spring (2) on the U-shaped detection frame (1), a pull rope (43) is wound on the winding roller (41), the outer end of the pull rope (43) bypasses the fixed pulley (42) and is connected with the carbon brush (3), and the pull rope (43) is also connected with an electronic hoist scale (44). The method has the characteristics of convenience and accuracy in measurement.

Description

Technical Field

[0001] The invention relates to a generator component detection device, in particular to an elastic force detection device for a generator vortex spring. Background Art

[0002] The carbon brushes of slip rings are an essential component of the slip ring system. Their primary function is to establish stable electrical contact between the slip ring and the brush, ensuring smooth current transfer. Slip rings are typically mounted on rotating equipment, such as the rotor of a generator or motor, while the carbon brushes are fixed to a fixed part of the equipment. Fixings press the carbon brushes against the slip rings, maintaining contact between the brushes and the slip ring, forming a conductive circuit.

[0003] There are various ways to secure the carbon brushes in the collector rings of large hydroelectric generators. One method involves using a scroll spring as a fixture, leveraging its spring pressure to secure the brushes. The compression force of the scroll spring directly affects the conduction of the circuit. Insufficient compression can prevent the carbon brushes from maintaining close contact with the collector ring, leading to poor contact and a disconnected circuit.

[0004] Therefore, during the maintenance of large hydro-generator sets, it is necessary to regularly measure the compression force, i.e., the elastic force, of the volute springs, and replace springs that do not meet the elastic force requirements and have unqualified performance.

[0005] Currently, the most common method for measuring the elastic force of a scroll spring is to use a spring scale to measure it manually. This method has problems such as difficulty in fixing the scroll spring, uncertainty in measurement accuracy, and time-consuming and labor-intensive measurement. Summary of the Invention

[0006] The object of the present invention is to provide a device for detecting the elastic force of a volute spring of a generator, which has the characteristics of convenient and accurate measurement.

[0007] The technical solution of the present invention: A spring force detection device for a generator scroll spring comprises a U-shaped detection frame, a scroll spring and a carbon brush are provided on the U-shaped groove of the U-shaped detection frame, the outer end of the scroll spring is fixedly connected to the U-shaped detection frame, the carbon brush is slidably connected to the U-shaped groove and abuts against the scroll spring, a winding drum is provided on the U-shaped detection frame above the carbon brush, a fixed pulley is provided on the U-shaped detection frame above the scroll spring, a pull rope is wound on the winding drum, the outer end of the pull rope passes around the fixed pulley and is connected to the carbon brush, and the pull rope is also connected to an electronic crane scale.

[0008] In the aforementioned elastic force detection device for the generator spiral spring, the U-shaped detection frame is provided with scales distributed along the expansion direction of the spiral spring.

[0009] In the aforementioned generator spiral spring elastic force detection device, the spiral spring includes a winding portion and a horizontal portion, a protrusion is provided on the back of the horizontal portion, and a slot connected to the protrusion is provided at the bottom of the U-shaped detection frame.

[0010] In the aforementioned elastic force detection device for the generator spiral spring, a support plate having the same height as the horizontal portion of the spiral spring is provided on the U-shaped groove, and the carbon brush slides on the support plate.

[0011] In the aforementioned elastic force detection device for the generator volute spring, a rolling plate is provided at the bottom of the carbon brush, and a rolling wheel is provided at the bottom of the rolling plate.

[0012] In the aforementioned elastic force detection device for the generator scroll spring, a sliding block is provided on the carbon brush, and a first guide rail for guiding the sliding block is provided on the U-shaped detection frame.

[0013] In the aforementioned generator volute spring elastic force detection device, the U-shaped detection frame is provided with a second guide rail for guiding the movement of the electronic crane scale.

[0014] In the aforementioned elastic force detection device of the generator volute spring, a carbon brush grinding roller is provided on the U-shaped detection frame on the side of the carbon brush away from the volute spring. The outside of the carbon brush grinding roller is wrapped with sandpaper, and the curvature of the contact surface between the sandpaper and the carbon brush is equal to the curvature of the collector ring.

[0015] In the aforementioned elastic force detection device of the generator vortex spring, the U-shaped detection frame is also provided with an offset detection component for detecting the offset of the pull rope; the offset detection component includes a fixed rod fixed on the U-shaped detection frame, and the fixed rod is respectively provided with a first mounting seat and a second mounting seat along the distribution direction of the pull rope, the first mounting seat is provided with a detection spring sleeved on the outside of the pull rope, and the second mounting seat is provided with a detection ring sleeved on the outside of the detection spring, and the first mounting seat and the second mounting seat are respectively connected to the positive and negative poles of the alarm via wires.

[0016] In the aforementioned elastic force detection device for the generator volute spring, a thread is provided on the surface of the fixing rod, and the first mounting seat and the second mounting seat are both threadedly connected to the fixing rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention secures the outer end of the spiral spring to prevent it from bouncing up and injuring someone. The carbon brush is then positioned so that it rests against the side of the unfolded spiral spring. The winding drum rotates to wind the pull rope, which, through the deflection of the fixed pulley, moves the carbon brush toward the side of the spiral spring, squeezing the spiral spring and causing the coiled portion of the spiral spring to straighten and unfold, deforming. Simultaneously, the electronic crane scale is subjected to tension and displays the tension value. The tension minus the friction caused by the movement of the carbon brush is the deformation force of the spiral spring, providing the elastic force of the spiral spring. The present invention can simultaneously measure the relationship between the deformed length and elastic force of the spiral spring, providing relatively accurate measurements and saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of the installation structure of the spiral spring.

[0021] Figure 3 It is a structural diagram of the rolling plate.

[0022] Figure 4 It is a structural schematic diagram of the detection process of the present invention.

[0023] Figure 5 It is a structural diagram of the offset detection component.

[0024] The marks in the accompanying drawings are: 1. U-shaped detection frame; 11. Card slot; 12. Scale; 13. Support plate; 2. Vortex spring; 21. Winding part; 22. Horizontal part; 23. Bump; 3. Carbon brush; 31. Rolling plate; 32. Rolling wheel; 33. Sliding block; 41. Winding roller; 42. Fixed pulley; 43. Pull rope; 44. Electronic crane scale; 5. Carbon brush grinding roller; 51. Sandpaper; 6. Offset detection assembly; 61. Fixed rod; 62. First mounting seat; 63. Second mounting seat; 64. Detection spring; 65. Detection ring; 66. Wire; 67. Alarm. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the examples, but they are not intended to limit the present invention.

[0026] Example:

[0027] like Figure 1-Figure 5As shown, the elastic force detection device of the generator scroll spring includes a U-shaped detection frame 1. The U-shaped groove of the U-shaped detection frame 1 is provided with a scroll spring 2 and a carbon brush 3. The outer end of the scroll spring 2 is fixedly connected to the U-shaped detection frame 1. The carbon brush 3 is slidably connected to the U-shaped groove and abuts against the scroll spring 2. A winding drum 41 is rotatably connected to the U-shaped detection frame 1 above the carbon brush 3 through a bracket. A fixed pulley 42 is rotatably connected to the U-shaped detection frame 1 above the scroll spring 2. A pull rope 43 is wound around the winding drum 41. One end of the pull rope 43 is fixed to the winding drum 41, and the other end of the pull rope 43 passes around the fixed pulley 42 and is connected to the carbon brush 3. The pull rope 43 is also connected to an electronic crane scale 44. Both the winding drum 41 and the fixed pulley 42 are provided with wire grooves.

[0028] Fix the outer end of the spiral spring 2 to prevent it from bouncing up and injuring people during testing, then adjust the position of the carbon brush 3 so that it is close to the side where the spiral spring 2 is unfolded. Turn the winding drum 41 to rewind the pull rope 43, which moves the carbon brush 3 toward the side where the spiral spring 2 is unfolded (according to the direction of the fixed pulley 42). Figure 1 The direction of movement is rightward), squeezing the spiral spring 2, causing the coiled portion 21 of the spiral spring 2 to straighten and expand, and deform. At the same time, the electronic hanging scale 44 is subjected to a tensile force, which is displayed as a tensile force value. The tensile force minus the friction force of the moving carbon brush 3 is the deformation force of the spiral spring 2, which is used to determine the elastic force of the spiral spring 2. The friction force of the moving carbon brush 3 can be measured according to the above structure without installing the spiral spring 2.

[0029] The U-shaped detection frame 1 is provided with scales 12 distributed along the expansion direction of the spiral spring 2. The scales 12 can be used to directly and intuitively observe the deformation length of the spiral spring 2.

[0030] The spiral spring 2 includes a coiled portion 21 and a horizontal portion 22. A protrusion 23 is provided on the back of the horizontal portion 22. The bottom of the U-shaped detection frame 1 is provided with a slot 11 connected to the protrusion 23. The spiral spring 2 is fixed by inserting its own protrusion 23 into the slot 11, without the need for other fixing parts, resulting in a simple structure and easy operation.

[0031] The bottom of the U-shaped groove is provided with a support plate 13 having the same height as the horizontal portion 22 of the spiral spring 2, and the carbon brush 3 slides on the support plate 13. The carbon brush 3 moves from the support plate 13 to the horizontal portion 22 of the spiral spring 2, maintaining the height consistency and stability of the carbon brush 3 during movement.

[0032] The bottom of the carbon brush 3 is provided with a rolling plate 31, and the bottom of the rolling plate 31 is provided with a rolling wheel 32. The rolling plate 31 with the rolling wheel 32 is provided at the bottom of the carbon brush 3 to reduce friction during movement, thereby improving the accuracy of the electronic crane scale 44 in measuring the elastic force.

[0033] A sliding block 33 is provided on the top of the carbon brush 3, and a first guide rail is provided on the U-shaped detection frame 1 for guiding the sliding block 33. The sliding block 33 cooperates with the first guide rail to limit the direction of movement of the carbon brush 3, preventing the carbon brush 3 from deflecting during movement and affecting the thrust of the spiral spring 2.

[0034] The U-shaped detection frame 1 is provided with a second guide rail for guiding the movement of the electronic crane scale 44. The second guide rail guides the movement direction of the electronic crane scale 44, prevents the electronic crane scale 44 from deflecting during movement, improves the movement stability of the electronic crane scale 44, and thus improves the detection accuracy of the electronic crane scale 44.

[0035] The pull rope 43 is stretched and wound in a horizontal state, and the bottom of the winding drum 41 and the top of the fixed pulley 42 are on the same horizontal plane.

[0036] A carbon brush grinding roller 5 is provided on the U-shaped detection frame 1 on the side of the carbon brush 3 away from the vortex spring 2. The outside of the carbon brush grinding roller 5 is wrapped with sandpaper 51. The curvature of the contact surface between the sandpaper 51 and the carbon brush 3 is equal to the curvature of the collector ring. Before detecting the elastic force of the vortex spring 2, the position of the vortex spring 2 on the U-shaped detection frame 1 is adjusted. The elastic force of the vortex spring 2 is used to press the carbon brush 3 so that the carbon brush 3 is close to the sandpaper 51 of the carbon brush grinding roller 5. The carbon brush grinding roller 5 is rotated to drive the sandpaper 51 to grind the surface of the carbon brush 3. During the grinding process, the vortex spring 2 always keeps the carbon brush 3 in contact with the sandpaper 51 until the surface of the carbon brush 3 is polished into an arc surface that matches the collector ring, so that the carbon brush 3 can better contact the collector ring when installed in the hydro-turbine generator.

[0037] The winding drum 41 and the carbon brush grinding roller 5 are both driven by a manual drive rod or an electric drive to rotate. The manual drive rod can be an operating handle, and the electric drive can be a drive motor.

[0038] The U-shaped detection frame 1 is also provided with a deviation detection assembly 6 for detecting the deviation of the pull rope 43. The deviation detection assembly 6 includes a fixed rod 61 fixed to the U-shaped detection frame 1. The fixed rod 61 is provided with a first mounting seat 62 and a second mounting seat 63 along the distribution direction of the pull rope 43. The first mounting seat 62 is provided with a detection spring 64 that is sleeved on the outside of the pull rope 43. The second mounting seat 63 is provided with a detection ring 65 that is sleeved on the outside of the detection spring 64. The first mounting seat 62 and the second mounting seat 63 are respectively connected to the positive and negative electrodes of an alarm 67 via wires 66. The detection spring 64, the detection ring 65, the first mounting seat 62 and the second mounting seat 63 are all made of conductive materials, while the fixed rod 61 is made of insulating material. When the pull rope 43 is pulled obliquely, the pull rope 43 drives the detection spring 64 to follow and tilt. When the pull rope 43 tilts to the point where the detection spring 64 contacts the detection ring 65, the positive and negative poles of the alarm 67 are connected to sound an alarm, which can more conveniently reflect whether the pull rope 43 is tilted and sound an alarm in time, so that the elastic force detection error of the spiral spring 2 can be discovered in time.

[0039] The surface of the fixing rod 61 is provided with threads, and the first mounting seat 62 and the second mounting seat 63 are both threadedly connected to the fixing rod 61. The first mounting seat 62 and the second mounting seat 63 can be adjusted on the fixing rod 61 by means of the threaded connection, thereby adjusting the distance between the end of the detection spring 64 and the detection ring 65, and further adjusting the offset angle of the detection of the pull rope 43.

[0040] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art may modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. The elastic force detection device of the generator scroll spring is characterized by: The invention comprises a U-shaped detection frame (1), wherein a volute spring (2) and a carbon brush (3) are arranged on the U-shaped groove of the U-shaped detection frame (1), the outer end of the volute spring (2) is fixedly connected to the U-shaped detection frame (1), the carbon brush (3) is slidably connected to the U-shaped groove and abuts against the volute spring (2), a winding drum (41) is arranged above the carbon brush (3) on the U-shaped detection frame (1), a fixed pulley (42) is arranged above the volute spring (2) on the U-shaped detection frame (1), a pull rope (43) is wound on the winding drum (41), the outer end of the pull rope (43) is passed around the fixed pulley (42) and connected to the carbon brush (3), and an electronic crane scale (44) is also connected to the pull rope (43).

2. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: The U-shaped detection frame (1) is provided with scales (12) distributed along the unfolding direction of the spiral spring (2).

3. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: The spiral spring (2) comprises a winding portion (21) and a horizontal portion (22); a protrusion (23) is provided on the back of the horizontal portion (22); and a slot (11) connected to the protrusion (23) is provided at the bottom of the U-shaped detection frame (1).

4. The elastic force detection device of the generator scroll spring according to claim 3, characterized in that: The U-shaped groove is provided with a support plate (13) having the same height as the horizontal portion (22) of the spiral spring (2), and the carbon brush (3) slides on the support plate (13).

5. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: A rolling plate (31) is provided at the bottom of the carbon brush (3), and a rolling wheel (32) is provided at the bottom of the rolling plate (31).

6. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: The carbon brush (3) is provided with a sliding block (33), and the U-shaped detection frame (1) is provided with a first guide rail for guiding the sliding block (33) to move.

7. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: The U-shaped detection frame (1) is provided with a second guide rail for guiding the electronic crane scale (44) to move.

8. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: A carbon brush grinding roller (5) is provided on the U-shaped detection frame (1) at a side of the carbon brush (3) away from the spiral spring (2); the outside of the carbon brush grinding roller (5) is wrapped with sandpaper (51); the curvature of the contact surface between the sandpaper (51) and the carbon brush (3) is equal to the curvature of the collector ring.

9. The elastic force detection device of the generator scroll spring according to claim 1, characterized in that: The U-shaped detection frame (1) is also provided with a displacement detection component (6) for detecting the displacement of the pull rope (43); the displacement detection component (6) comprises a fixing rod (61) fixed on the U-shaped detection frame (1); a first mounting seat (62) and a second mounting seat (63) are respectively provided on the fixing rod (61) along the distribution direction of the pull rope (43); the first mounting seat (62) is provided with a detection spring (64) sleeved on the outside of the pull rope (43); the second mounting seat (63) is provided with a detection ring (65) sleeved on the outside of the detection spring (64); the first mounting seat (62) and the second mounting seat (63) are respectively connected to the positive and negative electrodes of the alarm (67) via a wire (66).

10. The elastic force detection device of the generator scroll spring according to claim 9, characterized in that: The surface of the fixing rod (61) is provided with threads, and the first mounting seat (62) and the second mounting seat (63) are both threadedly connected to the fixing rod (61).

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