Automatic surveying and mapping device and surveying and mapping method for elasticity of carbon brush of brush excitation generator

Abstract

The invention relates to the field of power generation equipment, in particular to an automatic surveying and mapping device and method for carbon brush elasticity of a brush excitation generator. The device is characterized in that the lower part of a grip fixing device is embedded with a sliding embedding groove; a screw rod is arranged in the sliding embedding groove, a connecting piece is arranged on the screw rod in a sleeving manner, and the connecting piece is connected with the bottom of the grip fixing device; two ends of the screw are respectively connected with the rotary handle and the nut; the driving wheel and the driven wheel form belt transmission through the transmission belt, the driven wheel and the longitudinal bevel gear are coaxially arranged, the longitudinal bevel gear is meshed with the transverse bevel gear, the transverse bevel gear is fixed to the external thread transmission rod to form coaxial arrangement, and the upper portion of the external thread transmission rod is connected with the movable plate. An upper ejector rod is fixed on the movable plate; the upper part of the upper ejector rod penetrates through the open slot and is connected with the bottom of the sliding block; a movement sensor and a force sensor are arranged at the joint of the upper ejector rod and the sliding block; and the controller receives data of the displacement sensor and the force sensor, and transmits the data to the terminal after calculation. The method saves working hours and improves efficiency.

Description

Technical Field

[0001] The invention relates to the field of power generation equipment, and in particular to an automatic measuring and mapping device and method for the elastic force of a carbon brush of a brush excitation generator. Background Art

[0002] The hidden-pole, four-pole, three-phase synchronous generator adopts the machine-end static thyristor excitation method, that is, the brush excitation method. After the rotor excitation current is introduced into the rotor through the carbon brush, it is transmitted to the rotor coil through the collector ring, conductive screw, conductive rod, and rotor lead.

[0003] When the generator is running, the brush is directly in contact with the collector ring through the winding spring, and the high-speed friction introduces the excitation current into the rotor. If the elastic force is too large, the brush will wear too quickly. If the elastic force is too small, the brush and the collector ring may not be in sufficient contact, and the contact surface is too small, resulting in local temperature rise, which may even cause serious accidents in the long run. Since the winding spring may fail to press the carbon brush due to fatigue, aging, corrosion, etc., the winding spring is manually tested for elasticity regularly. The steps are:

[0004] 1. Remove the carbon brush from the brush holder and remove the electric brush from the carbon brush;

[0005] 2. Use a soft cloth to clean the brush holder and insulating handle;

[0006] 3. Use a spring dynamometer to hook the winding spring from above and apply force upward to deform it. Test the elastic force of the springs one by one to confirm whether they are qualified;

[0007] In the process of testing the spring elastic force, since the dynamometer is pulled upward manually, there is inevitably a directional deviation in the force output process, resulting in inaccurate results. At the same time, manual testing one by one is inefficient, and sweat stains on the hands may also aggravate the corrosion of the spring. In addition, the results are presented in a tabular form, which is not digital, automated, and graphical, and it is cumbersome to confirm that they are qualified. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a device and method for automatically measuring the elastic force of a carbon brush of a brush excitation generator, which can measure the elastic force of the spring in a mechanized, digital, automated and graphical manner, saving working hours and improving efficiency.

[0009] The present invention provides a device for automatically measuring and mapping the elastic force of a carbon brush of a brush excitation generator, comprising: a grip fixing device, a base, a slider, a controller and a terminal;

[0010] The top of the base is provided with a sliding groove and a slot for the upper push rod.

[0011] The lower part of the grip fixing device protrudes outwards and is engaged with the sliding engagement groove;

[0012] A screw is provided in the sliding engagement groove, a connecting piece is sleeved on the screw, and the connecting piece is connected to the bottom of the handle fixing device; one end of the screw is connected to a rotating handle, and the other end is connected to an anti-drop nut;

[0013] The base is internally provided with a motor, a driving wheel, a driven wheel, a longitudinal bevel gear, a transverse bevel gear, an external thread transmission rod, an internal thread transmission rod, an upper push rod, and a movable plate;

[0014] The motor is connected to the driving wheel, and the driving wheel forms a belt drive with the driven wheel through a transmission belt. The driven wheel is coaxially arranged with the longitudinal bevel gear, and the longitudinal bevel gear meshes with the transverse bevel gear to form a gear connection. The transverse bevel gear is fixed on the external thread transmission rod to form a coaxial arrangement.

[0015] The external thread transmission rod and the internal thread transmission rod form a threaded connection, the upper part of the external thread transmission rod is connected to the movable plate, and the lower part of the internal thread transmission rod is fixed to the inner surface of the base;

[0016] An upper push rod is fixed on the movable plate, and the upper part of the upper push rod passes through the slot of the upper push rod and is connected to the bottom of the slider;

[0017] A displacement sensor and a force sensor are provided at the connection between the upper ejector rod and the slider;

[0018] The controller receives data from the displacement sensor and the force sensor, transmits it to the terminal after completing the calculation, and the terminal determines whether the carbon brush is qualified.

[0019] Preferably, the handle fixing device has four longitudinal fixing holes and one transverse fixing hole.

[0020] Preferably, the upper push rods are provided in a plurality and arranged in a row;

[0021] The upper part of each upper push rod is connected with a sliding block, and the sliding blocks are arranged in a row and parallel to the handle fixing device.

[0022] Preferably, the bottom of the slider is provided with an upper push rod fitting groove, the upper push rod is inserted into the upper push rod fitting groove and is fitted with the slider;

[0023] A displacement sensor and a force sensor are fixed to the top of the upper ejector rod.

[0024] Preferably, it further comprises a threadless positioning rod, wherein the upper portion of the threadless positioning rod is connected to the movable plate and the lower portion is fixed to the inner surface of the base;

[0025] The threadless positioning rod is retractable and moves along with the up and down movement of the external thread transmission rod.

[0026] Preferably, 4 to 6 threadless positioning rods are provided.

[0027] Preferably, 2 to 4 externally threaded transmission rods are provided.

[0028] Preferably, a shallow groove is also provided on the top of the base to limit the sliding block.

[0029] Preferably, the controller completes the calculation and fitting of the height and elastic force, measures and maps the elastic force-formation curve, and transmits the comparison data of the measured curve and the standard curve as well as the variance to the terminal via wireless communication.

[0030] The present invention provides a method for automatically measuring and mapping the elastic force of a carbon brush of a brush excitation generator, comprising the following steps:

[0031] Fix the carbon brush on the handle fixture.

[0032] Set the interval distance, turn on the motor, and the slider moves upward to squeeze the carbon brush. After the carbon brush moves upward to the interval distance, the motor is controlled to stop and the data of the displacement sensor and the force sensor are recorded;

[0033] The controller completes the calculation and fitting, measures and plots the elastic force-stroke curve, and transmits the comparison data of the measured curve and the standard curve as well as the variance to the terminal via wireless communication to determine whether the spring of the carbon brush is qualified.

[0034] Compared with the prior art, the automatic measurement and mapping device for the elastic force of the carbon brush of the brush excitation generator of the present invention has the following beneficial effects:

[0035] 1. Through the comprehensive use of mechanized, digital, automated and image-based methods of measuring and mapping the spring Fx curve, the technical effect of improving efficiency and clearly judging whether it is qualified or not is achieved;

[0036] 2. By adopting the technical means of mechanical structure, the technical effect of reducing manual deviation and improving the accuracy of results is achieved;

[0037] 3. The technical effect of saving working hours and improving efficiency is achieved by synchronously testing multiple winding springs and automating the testing;

[0038] 4. By adopting the technical means of sliding mechanical design for the carbon brush grip fixing device, the technical effect of reducing costs by being applicable to carbon brushes of different specifications is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram showing the overall structure of an automatic measuring device for the elastic force of a carbon brush of a brush-excitation generator;

[0040] Figure 2 A diagram showing the structure of the grip fixing device;

[0041] Figure 3 A diagram showing the sliding mechanism structure of the grip fixing device;

[0042] Figure 4 Indicates the overall appearance of the base;

[0043] Figure 5 It shows the structure diagram of the stainless steel slider and sensor;

[0044] Figure 6 Indicates belt and gear transmission mechanism;

[0045] In the figure, 1 is a handle fixing device; 2 is an anti-dropping nut; 3 is a screw; 4 is a gear transmission structure; 5 is a belt transmission structure; 6 is a slider; 7 is a base; 8 is a longitudinal fixing hole; 9 is a transverse fixing hole; 10 is a sliding interlocking structure; 11 is a connecting piece; 12 is a sliding interlocking groove; 13 is a rotating handle; 14 is a shallow groove; 15 is an upper push rod slot; 16 is an upper push rod interlocking groove; 17 is a displacement sensor and a force sensor; 18 is a transverse bevel gear; 19 is a longitudinal bevel gear; 20 is a driving wheel; 21 is a motor; 22 is an upper push rod; 23 is an externally threaded transmission rod; 24 is a driven wheel; 25 is a transmission belt; 26 is an internally threaded transmission rod; 27 is a threadless positioning rod; 28 is a movable plate. DETAILED DESCRIPTION

[0046] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0047] The main principle of the present invention is to use a motor to push a slider to deform a spring and to test the elastic force through a sensor.

[0048] According to the principle of force balance, the slider, displacement sensor and force sensor are used to replace the original spring dynamometer. The motor and mechanical structure that are more stable than human hands are used to replace human power to push the slider from bottom to top. After calibrating to zero at the starting point, it stops at each set distance and records the value of the sensor to obtain the (height, elastic force) point. The controller completes the calculation and fitting, and maps the elastic force-stroke curve (Fx). The measured curve is compared with the standard curve and various data such as variance are transmitted to the terminal through wireless transmission to facilitate judgment of whether it is qualified.

[0049] For carbon brushes of different specifications, a slidable grip fixture and a detachable slider are used to achieve the purpose of being suitable for four-slot carbon brushes or five-slot carbon brushes at the same time.

[0050] The embodiment of the present invention discloses a device for automatically measuring the elastic force of a carbon brush of a brush excitation generator, such as Figures 1 to 6 As shown, it includes: a handle fixing device 1, a base 7, a slider 6, a controller and a terminal;

[0051] The top of the base 7 is provided with a sliding engagement groove 12 and an upper push rod groove 15.

[0052] The lower part of the handle fixing device 1 protrudes outward, which is a sliding interlocking structure 10, and the sliding interlocking structure 10 is interlocked with the sliding interlocking groove 12;

[0053] A screw rod 3 is provided in the sliding engagement groove 12, a connecting piece 11 is sleeved on the screw rod 3, and the connecting piece 11 is connected to the bottom of the grip fixing device 1; one end of the screw rod 3 is connected to a rotating handle 13, and the other end is connected to an anti-drop nut 2;

[0054] The handle fixing device forms a screw connection through the anti-drop nut 2, the screw 3 and the handle fixing device connecting piece 11, and is engaged with the sliding engaging groove 12 through the sliding engaging structure 10. The left and right translation of the fixed handle device 1 can be achieved by rotating the rotating handle 13.

[0055] The handle fixing device 1 has four longitudinal fixing holes 8 and one transverse fixing hole 9, which are directly connected to the brush handle.

[0056] The base 7 is internally provided with a motor 21, a driving wheel 20, a driven wheel 24, a longitudinal bevel gear 19, a transverse bevel gear 18, an external thread transmission rod 23, an internal thread transmission rod 26, an upper push rod 22, and a movable plate 28;

[0057] The motor 21 is connected to the driving wheel 20, and the driving wheel 20 forms a belt drive with the driven wheel 24 through the transmission belt 25. The driven wheel 24 is coaxially arranged with the longitudinal bevel gear 19, and the longitudinal bevel gear 19 is meshed with the transverse bevel gear 18 to form a gear connection. The transverse bevel gear 18 is fixed on the external thread transmission rod 23 to form a coaxial arrangement.

[0058] The external thread transmission rod 23 and the internal thread transmission rod 26 are threadedly connected, the upper part of the external thread transmission rod 23 is connected to the movable plate 28, and the lower part of the internal thread transmission rod 26 is fixed to the inner surface of the base 7;

[0059] It also includes a non-threaded positioning rod 27, which is connected to a movable plate 28 at the top and fixed to the inner surface of the base 7 at the bottom; the non-threaded positioning rod does not provide power, but only serves to limit its left and right deviation and balance.

[0060] The non-threaded positioning rod 27 is retractable and moves along with the up and down movement of the external threaded transmission rod 23 .

[0061] Preferably, 4 to 6 threadless positioning rods 27 are provided.

[0062] The number of the externally threaded transmission rods 23 is preferably 2 to 4. In conjunction with this, the number of the internally threaded transmission rods 26 is equal to the number of the externally threaded transmission rods 23.

[0063] An upper push rod 22 is fixed on the movable plate 28, and the upper part of the upper push rod 22 passes through the upper push rod slot 15 and is connected to the bottom of the slider 6;

[0064] A displacement sensor and a force sensor 17 are provided at the connection between the upper push rod 22 and the slide block 6;

[0065] According to the present invention, the driving wheel 20, the driving belt 25 and the driven wheel 24 constitute a belt drive structure 5;

[0066] The longitudinal bevel gear 19, the transverse bevel gear 18, and the external thread transmission rod 23 constitute a gear transmission structure 4;

[0067] Through the 4 gear transmission structure and the 5 belt transmission structure, the rotary motion on the motor is converted into the ascending motion of the upper push rod 22 and the slide block 6 to perform surveying and mapping work.

[0068] The upper push rods 22 are provided in a plurality and arranged in a row; when there are 4 to 5 carbon brushes, the upper push rods 22 and the sliders 6 are also provided with 4 to 5;

[0069] The upper portion of each upper push rod 22 is connected to a sliding block 6 , and the sliding blocks 6 are arranged in a row and parallel to the handle fixing device 1 .

[0070] The slider 6 is preferably a stainless steel slider;

[0071] The bottom of the slider 6 is provided with an upper push rod fitting groove 16, and the upper push rod 22 is inserted into the upper push rod fitting groove 16 and fitted with the slider 6; this connection mode is easy to disassemble and is convenient for measuring carbon brushes of different specifications;

[0072] A displacement sensor and a force sensor 17 are fixed to the top of the upper push rod 22 .

[0073] A shallow groove 14 is also provided on the top of the base 7 to limit the slider 6 .

[0074] The controller receives data from the displacement sensor and the force sensor, transmits it to the terminal after completing the calculation, and the terminal determines whether the carbon brush is qualified.

[0075] The controller completes the calculation and fitting of the height and elastic force, measures and maps the elastic force-formation curve, and transmits the comparison data of the measured curve and the standard curve and the variance to the terminal through wireless communication.

[0076] The operating method of the automatic measuring and mapping device for the elastic force of the carbon brush of the brush excitation generator of the present invention is as follows:

[0077] The brush holder is fixed to the handle fixture 1 using the longitudinal fixing hole 8 and the transverse fixing hole 9 on the handle fixture 1 to ensure that the carbon brush does not move up and down or left and right during the measurement process. In order to achieve the application of carbon brushes of various specifications, the anti-drop nut 2 and the screw 3 and the connecting piece 11 structure are adopted, so that the handle fixture 1 can slide left and right on the base 7 by rotating the handle 13, and the sliding interlocking structure 10 and the sliding interlocking groove 12 are combined to ensure that the handle fixture 1 does not move up and down when subjected to the force of the stainless steel slider.

[0078] Through the gear transmission structure 4 and the belt transmission structure 5, the rotational motion of the motor 21 is converted into the upward motion of the upper push rod 22 and the slider 6 for mapping. At the same time, the upper push rod fitting groove 16 allows the slider 6 to be disassembled, which is convenient for measuring carbon brushes of different specifications. The displacement sensor and force sensor 17 are located between the slider 6 and the upper push rod 22 and fixed on the upper push rod 22.

[0079] The rotation of the motor 21 is transmitted to the driving wheel 20 through the transmission belt 25 and then to the driven wheel 24 and its coupling to drive the rotation of the two longitudinal bevel gears 19. The longitudinal bevel gears 19 cooperate with the transverse bevel gears 18 to transmit the rotation to the external threaded transmission rod 23. The external threaded transmission rod 23 cooperates with the internal threaded transmission rod 26. Due to the limiting relationship, the rotational motion is converted into the up and down motion of the external threaded transmission rod 23. During the whole movement process, the two external threaded transmission rods 23 provide the rising power, and the four threadless positioning rods 27 cooperate with the inner rods, do not provide power, and only play a role in limiting its left and right deviation and balancing.

[0080] The embodiment of the present invention also discloses a method for automatically measuring and mapping the elastic force of a carbon brush of a brush-excitation generator using the above technical solution, comprising the following steps:

[0081] Fix the carbon brush on the handle fixture.

[0082] Set the interval distance, turn on the motor, and the slider moves upward to squeeze the carbon brush. After the carbon brush moves upward to the interval distance, the motor is controlled to stop and the data of the displacement sensor and the force sensor are recorded;

[0083] The controller completes the calculation and fitting, measures and plots the elastic force-stroke curve, and transmits the comparison data of the measured curve and the standard curve as well as the variance to the terminal via wireless communication to determine whether the spring of the carbon brush is qualified.

[0084] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0085] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic measurement device for the elastic force of carbon brushes of brush-excitation generators. It is characterized in that include: grip fixtures, bases, slides, controls and terminals; The top of the base is provided with a sliding groove and a slot for the upper push rod. The lower part of the grip fixing device protrudes outwards and is engaged with the sliding engagement groove; A screw is provided in the sliding engagement groove, a connecting piece is sleeved on the screw, and the connecting piece is connected to the bottom of the handle fixing device; one end of the screw is connected to a rotating handle, and the other end is connected to an anti-drop nut; The base is internally provided with a motor, a driving wheel, a driven wheel, a longitudinal bevel gear, a transverse bevel gear, an external thread transmission rod, an internal thread transmission rod, an upper push rod, and a movable plate; The motor is connected to the driving wheel, and the driving wheel forms a belt drive with the driven wheel through a transmission belt. The driven wheel is coaxially arranged with the longitudinal bevel gear, and the longitudinal bevel gear meshes with the transverse bevel gear to form a gear connection. The transverse bevel gear is fixed on the external thread transmission rod to form a coaxial arrangement. The external thread transmission rod and the internal thread transmission rod form a threaded connection, the upper part of the external thread transmission rod is connected to the movable plate, and the lower part of the internal thread transmission rod is fixed to the inner surface of the base; An upper push rod is fixed on the movable plate, and the upper part of the upper push rod passes through the slot of the upper push rod and is connected to the bottom of the slider; A displacement sensor and a force sensor are provided at the connection between the upper ejector rod and the slider; The controller receives data from the displacement sensor and the force sensor, transmits it to the terminal after completing the calculation, and the terminal determines whether the carbon brush is qualified.

2. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that The handle fixing device is provided with four longitudinal fixing holes and one transverse fixing hole.

3. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that The upper push rods are provided in a plurality and arranged in a row; The upper part of each upper push rod is connected with a sliding block, and the sliding blocks are arranged in a row and parallel to the handle fixing device.

4. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that The bottom of the slider is provided with an upper push rod fitting groove, the upper push rod is inserted into the upper push rod fitting groove and is fitted with the slider; A displacement sensor and a force sensor are fixed to the top of the upper ejector rod.

5. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that It also includes a non-threaded positioning rod, the upper part of which is connected to the movable plate and the lower part is fixed to the inner surface of the base; The threadless positioning rod is retractable and moves along with the up and down movement of the external thread transmission rod.

6. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 5, It is characterized in that The number of the threadless positioning rods is 4 to 6.

7. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that The number of external thread transmission rods is 2 to 4.

8. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that A shallow groove is also provided on the top of the base to limit the sliding block.

9. The automatic measuring device for the elastic force of the carbon brush of the brush excitation generator according to claim 1, It is characterized in that The controller completes the calculation and fitting of the height and elastic force, measures and maps the elastic force-formation curve, and transmits the comparison data of the measured curve and the standard curve and the variance to the terminal through wireless communication.

10. Automatic measurement method of the elastic force of the carbon brush of the brush excitation generator. It is characterized in that The following steps are involved: Fix the carbon brush on the handle fixture. Set the interval distance, turn on the motor, and the slider moves upward to squeeze the carbon brush. After the carbon brush moves upward to the interval distance, the motor is controlled to stop and the data of the displacement sensor and the force sensor are recorded; The controller completes the calculation and fitting, measures and plots the elastic force-stroke curve, and transmits the comparison data of the measured curve and the standard curve as well as the variance to the terminal via wireless communication to determine whether the spring of the carbon brush is qualified.

Images