CN220233690U - Abrasion length monitoring device for large-shaft grounding carbon brush - Google Patents
Abrasion length monitoring device for large-shaft grounding carbon brush Download PDFInfo
- Publication number
- CN220233690U CN220233690U CN202321259568.6U CN202321259568U CN220233690U CN 220233690 U CN220233690 U CN 220233690U CN 202321259568 U CN202321259568 U CN 202321259568U CN 220233690 U CN220233690 U CN 220233690U
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- China
- Prior art keywords
- carbon brush
- travel switch
- sliding cavity
- monitoring device
- brush
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 74
- 238000012806 monitoring device Methods 0.000 title claims abstract description 14
- 238000005299 abrasion Methods 0.000 title abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000007689 inspection Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a wear length monitoring device of a large-shaft grounding carbon brush, which comprises the following components: the brush holder is provided with a sliding cavity, and a mounting hole perpendicular to the direction of the sliding cavity is formed in a set position of the brush holder; the carbon brush is arranged in the sliding cavity in a sliding manner; the constant-pressure spring is arranged in the sliding cavity and applies constant pressure to one end of the carbon brush positioned in the sliding cavity; a travel switch installed in the installation hole; and the alarm system is connected with the leading-out cable of the travel switch in series at two ends of the power supply, and when the carbon brush moves to a set position, the alarm system and the travel switch form a closed loop, and the alarm system gives an alarm. According to the utility model, whether the carbon brush extrudes the contact head of the travel switch or not is adopted, so that the abrasion length of the grounding carbon brush of the large shaft is monitored, and the loss of grounding points of the large shaft and the failure of the grounding protection function of the rotor are avoided. The problem that the real-time monitoring cannot be carried out by manual field inspection in the past is solved.
Description
Technical Field
The utility model relates to the technical field of carbon brushes, in particular to a wear length monitoring device for a large-shaft grounding carbon brush.
Background
The large-shaft grounding carbon brush of the hydraulic generator is not only used for grounding the large shaft, but also used for grounding the generator rotor to protect main components of a hard-wired loop. If the carbon brush is not enough in length after being worn, the grounding point of the large shaft is lost, the grounding protection function of the rotor is invalid, when one or two points of the rotor are grounded, the protection cannot accurately act on signals and trip, the rotor can be burnt out, and catastrophic damage is brought to the generator. At present, the abrasion condition of the large-shaft grounding carbon brush mainly adopts a manual field inspection mode.
The large-shaft grounding carbon brush is arranged on a large shaft of a closed waterwheel chamber water turbine, the large-shaft grounding carbon brush does not have an inspection condition during long-period full-load operation, the abrasion condition of the carbon brush cannot be monitored in real time, and when the grounding carbon brush is worn out, the grounding protection of a rotor is lost, so that the protection device can possibly fail to operate. Therefore, it is necessary to monitor the abrasion length of the large-shaft grounding carbon brush, so as to assist the operation and maintenance personnel in grasping the abrasion condition of the large-shaft grounding carbon brush, and improve the equipment maintenance efficiency and the correct action rate of the protection device.
Disclosure of Invention
The utility model provides a wear length monitoring device for a large-shaft grounding carbon brush, which aims to solve the technical problems.
The technical scheme adopted by the utility model is as follows: provided is a large-shaft grounding carbon brush abrasion length monitoring device, comprising:
the brush holder is provided with a sliding cavity, and a mounting hole perpendicular to the direction of the sliding cavity is formed in a set position of the brush holder;
the carbon brush is arranged in the sliding cavity in a sliding manner;
the constant-pressure spring is arranged in the sliding cavity and applies constant pressure to one end of the carbon brush positioned in the sliding cavity;
a travel switch installed in the installation hole;
and the alarm system is connected with the leading-out cable of the travel switch in series at two ends of the power supply, and when the carbon brush moves to a set position, the alarm system and the travel switch form a closed loop, and the alarm system gives an alarm.
Further, the travel switch is a contact travel switch.
Further, the travel switch comprises a base, a compression spring, a conductive copper plate, two normally closed contacts and a contact head, wherein a vertical installation cavity is formed in the base, the two normally closed contacts are installed in the middle of the side wall of the cavity of the vertical installation cavity, the compression spring, the conductive copper plate and the contact head are sequentially connected from bottom to top and are located in the vertical installation cavity, the conductive copper plate is located below the two normally closed contacts, and the compression spring is in a compressed state; the base is arranged in the mounting hole on the brush holder, and the contact head is contacted with the side wall of the carbon brush.
Further, an arc-shaped protrusion is arranged at one end of the contact head, which is in contact with the carbon brush.
Further, a wedge block is arranged at one end of the contact head, which is in contact with the carbon brush, and the inclined surface of the wedge block faces towards one end of the constant voltage spring, which is in contact with the carbon brush.
Furthermore, the base and the moving contact are made of polytetrafluoroethylene.
Further, a plurality of mounting holes are formed along the sliding cavity direction of the brush holder; the travel switch is provided with a plurality of travel switches which are respectively installed in a plurality of installation holes.
The beneficial effects of the utility model are as follows: according to the utility model, whether the carbon brush extrudes the contact head of the travel switch or not is adopted, so that the abrasion length of the grounding carbon brush of the large shaft is monitored, and the loss of grounding points of the large shaft and the failure of the grounding protection function of the rotor are avoided. The problem that the abrasion condition of the large-shaft grounding carbon brush can only be checked on the manual site and cannot be monitored in real time is solved.
Drawings
Fig. 1 is a schematic structural diagram of a wear length monitoring device for a large-shaft grounding carbon brush in the normal length of the carbon brush disclosed by the utility model;
fig. 2 is a schematic structural diagram of a device for monitoring the abrasion length of a large-shaft grounding carbon brush when the carbon brush is abraded to a temporary position;
FIG. 3 is a schematic diagram of a travel switch according to the present disclosure;
fig. 4 is a circuit diagram of a monitor circuit according to the present disclosure.
Reference numerals: the novel high-voltage power supply comprises a brush holder 1, a sliding cavity 11, a carbon brush 2, a travel switch 3, a base 31, a vertical mounting cavity 32, a compression spring 33, a conductive copper plate 34, a normally closed contact 35, a contact 36, an arc protrusion 361, a lead-out cable of a carbon brush 4, a lead-out cable of a travel switch 5, a constant voltage spring 6, a warning system 7, a normal length of the carbon brush A and a wear length of the carbon brush B.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings, but embodiments of the present utility model are not limited thereto. It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1:
referring to fig. 1 to 4, the present embodiment discloses a wear length monitoring device for a large-shaft grounding carbon brush, which includes: the brush holder 1 is provided with a sliding cavity 11, and a mounting hole perpendicular to the direction of the sliding cavity 11 is formed in a set position of the brush holder 1; the carbon brush 2 is arranged in the sliding cavity 11 in a sliding manner; a constant pressure spring 6 installed in the sliding chamber 11 and applying a constant pressure to an end (left end in fig. 1) of the carbon brush 2 located in the sliding chamber 11; a travel switch 3 mounted in the mounting hole; and the alarm system 7 is connected with the outgoing cable 5 of the travel switch in series at two ends of the power supply, and when the carbon brush 2 moves to a set position, the alarm system 7 and the travel switch 3 form a closed loop, and the alarm system 7 gives an alarm.
Specifically, the normal carbon brush length a is shown in fig. 1, and the carbon brush abrasion length B is shown in fig. 2. When the carbon brush 2 is worn to the position shown in fig. 2, the carbon brush 2 and the lead-out cable 4 of the carbon brush need to be replaced, and the monitoring device of the present embodiment can give an alarm when the carbon brush 2 needs to be replaced.
Specifically, the travel switch may be a contact switch or a non-contact switch (such as a photoelectric proximity switch), and in this embodiment, a contact travel switch (i.e., a mechanical contact travel switch) is used. Referring to fig. 3, the contact travel switch comprises a base 31, a compression spring 33, a conductive copper plate 34, two normally closed contacts 35 and a contact head 36. The base 31 is of a cylindrical or cuboid structure, a vertical installation cavity 32 is arranged in the middle of the base, and two normally-closed contacts 35 are installed in the middle of the inner wall of the cavity. The bottom of the compression spring 33 is fixed on the bottom end face of the vertical mounting cavity 32, the top of the compression spring 33 is mounted on the bottom end face of the conductive copper plate 34, the bottom of the contact head 36 is mounted on the top end face of the conductive copper plate 34, the compression spring 33, the conductive copper plate 34 and the contact head 36 are positioned in the vertical mounting cavity 32, the conductive copper plate 34 is positioned below the two normally-closed contacts 35, and the compression spring 33 is in a compressed state; the base 31 is installed in the installation hole on the brush holder 1, and the contact head 36 contacts with the side wall of the carbon brush 1.
Specifically, the base 31 and the moving contact are preferably made of polytetrafluoroethylene, and the polytetrafluoroethylene has good insulation, wear resistance and strength.
Monitoring circuit referring to fig. 4, two normally closed contacts 35 are connected to the positive and negative poles of the 24V common terminal through the outgoing cables 5 of the travel switch, respectively, and an alarm system 7 is connected in series to the monitoring circuit. When the carbon brush 2 is in the position shown in fig. 1, the contact 36 is pressed, the conductive copper plate 34 is separated from the two normally-closed contacts 35, the monitoring circuit is in a broken state, and the alarm system 7 does not give an alarm. When the carbon brush 2 wears to the position shown in fig. 2, the contact 36 is not pressed at this time, the conductive copper plate 34 is in contact with the two normally closed contacts 35, the monitoring circuit forms a closed loop at this time, and the alarm system 7 gives an alarm, so that the worker is reminded to replace the carbon brush 2 and the lead-out cable 4 of the carbon brush. The alarm system 7 is connected to the monitoring background and can automatically and remotely monitor and alarm. In other embodiments, the alarm system 7 may be replaced by an alarm, which is alerted by a sound or indicator light.
Specifically, the top of the contact head 36 is provided with an arc-shaped protrusion 361. In other embodiments, a wedge block (not shown) is disposed at the end of the contact head contacting the carbon brush, and the inclined surface of the wedge block faces the end of the constant voltage spring contacting the carbon brush (left side in fig. 1), so that after the carbon brush 2 passes through the wedge block, the carbon brush 2 can not move backward any more, and frequent warning caused by the carbon brush 2 moving slightly forward and backward along with the large axis when the carbon brush 2 is worn to the critical position can be effectively avoided.
Further, a plurality of mounting holes are formed along the sliding cavity 11 direction of the brush holder 1; the travel switch 3 has a plurality ofly, and travel switch 3 numbers are the same with the mounting hole number, and travel switch 3 installs respectively in a plurality of mounting holes, when using, can know the approximate wearing and tearing length of carbon brush 2 according to actual need or carbon brush material, and it is more accurate to report to the police like this, and the suitability is also higher.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (5)
1. A large-shaft grounding carbon brush wear length monitoring device, characterized by comprising:
the brush holder is provided with a sliding cavity, and a mounting hole perpendicular to the direction of the sliding cavity is formed in a set position of the brush holder;
the carbon brush is arranged in the sliding cavity in a sliding manner;
the constant-pressure spring is arranged in the sliding cavity and applies constant pressure to one end of the carbon brush positioned in the sliding cavity;
a travel switch installed in the installation hole;
the alarm system is connected with the leading-out cable of the travel switch in series at two ends of the power supply, and when the carbon brush moves to a set position, the alarm system and the travel switch form a closed loop, and the alarm system gives an alarm;
the travel switch is a contact travel switch;
the travel switch comprises a base, a compression spring, a conductive copper plate, two normally closed contacts and a contact head, wherein a vertical installation cavity is formed in the base, the two normally closed contacts are installed in the middle of the side wall of the cavity of the vertical installation cavity, the compression spring, the conductive copper plate and the contact head are sequentially connected from bottom to top and are positioned in the vertical installation cavity, the conductive copper plate is positioned below the two normally closed contacts, and the compression spring is in a compression state; the base is arranged in the mounting hole on the brush holder, and the contact head is contacted with the side wall of the carbon brush.
2. The large-shaft grounding carbon brush wear length monitoring device according to claim 1, wherein an arc-shaped protrusion is provided at an end of the contact head that contacts the carbon brush.
3. The large-shaft grounding carbon brush wear length monitoring device according to claim 1, wherein a wedge block is provided at an end of the contact head which contacts the carbon brush, and an inclined surface of the wedge block faces an end of the constant-pressure spring which contacts the carbon brush.
4. The large-shaft grounding carbon brush wear length monitoring device according to claim 1, wherein the base and the moving contact are made of polytetrafluoroethylene.
5. The large-shaft grounding carbon brush wear length monitoring device according to claim 1, wherein a plurality of mounting holes are provided along a sliding cavity direction of the brush holder; the travel switch is provided with a plurality of travel switches which are respectively installed in a plurality of installation holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321259568.6U CN220233690U (en) | 2023-05-23 | 2023-05-23 | Abrasion length monitoring device for large-shaft grounding carbon brush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321259568.6U CN220233690U (en) | 2023-05-23 | 2023-05-23 | Abrasion length monitoring device for large-shaft grounding carbon brush |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220233690U true CN220233690U (en) | 2023-12-22 |
Family
ID=89187342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321259568.6U Active CN220233690U (en) | 2023-05-23 | 2023-05-23 | Abrasion length monitoring device for large-shaft grounding carbon brush |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220233690U (en) |
-
2023
- 2023-05-23 CN CN202321259568.6U patent/CN220233690U/en active Active
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