CN204118439U - Carbon brush holder - Google Patents
Carbon brush holder Download PDFInfo
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- CN204118439U CN204118439U CN201420487554.4U CN201420487554U CN204118439U CN 204118439 U CN204118439 U CN 204118439U CN 201420487554 U CN201420487554 U CN 201420487554U CN 204118439 U CN204118439 U CN 204118439U
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- carbon brush
- brush holder
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Abstract
The utility model discloses a kind of carbon brush holder, its drip irrigation device comprises carbon brush, two brush-boxs and carbon brush holder, respectively carbon brush is provided with in described brush-box, two described brush-boxs are respectively provided with ear near the side of carbon brush holder, described ear and carbon brush holder are rotationally connected, it is characterized in that: described carbon brush holder is provided with and can makes the drive unit that described in two, brush-box afterbody is adjacent to each other, described carbon brush holder is also provided with the control circuit for controlling described drive unit, control circuit comprises detecting unit, control unit and alarm unit, the utility model fits that to be to prevent the carbon brush temperature in brush-box too high.
Description
Technical field
The utility model relates to a kind of current-collector, and more particularly, it relates to a kind of carbon brush holder that carbon brush temperature can be prevented too high.
Background technology
Carbon brush is the device of transferring energy or signal between the standing part of motor or generator or other rotating machineries and rotating part, and it to be stuck on metallic support and to be pressed in rotating shaft by elastic component, during electric machine rotation, electric energy is flowed to coil by phase changer.
Tradition collector ring be furnished with two brush-boxs, in two brush-boxs, a carbon brush is respectively installed, carbon brush operationally, because it is connected with collector ring, as easy as rolling off a log heating, carbon brush generate heat to a certain degree time, be easy to whole carbon brush holder is damaged.And if maintenance personal fails to change in time, even have the possibility of burning whole motor, bring more serious impact.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of carbon brush holder that carbon brush temperature can be prevented too high.
For achieving the above object, the utility model adopts following technical scheme: a kind of carbon brush holder, comprise carbon brush, two brush-boxs and carbon brush holder, respectively carbon brush is provided with in described brush-box, two described brush-boxs are respectively provided with ear near the side of carbon brush holder, and described ear and carbon brush holder are rotationally connected, and described carbon brush holder is provided with and can makes the drive unit that described in two, brush-box afterbody is adjacent to each other, described carbon brush holder is also provided with the control circuit for controlling described drive unit
Described control circuit comprises:
Detecting unit, has output, detects the temperature of carbon brush and exports a control signal at its output;
Control unit, has input and output, and its input is coupled to the output of described detecting unit to receive this control signal, and output is coupled to the supply terminals of described drive unit;
Alarm unit, has input, and its input is coupled to the output of described detecting unit to receive this control signal.
As preferably, described detecting unit comprises:
Test section, has:
First output, exports the first electric potential signal;
Second output, exports the second electric potential signal;
Comparing section, has:
In-phase input end, is coupled to described second output;
Inverting input, is coupled to described first input end;
Output, exports control signal.
As preferably, described test section comprises:
First point of splenium, by one first resistance and a thermistor in series;
Second point of splenium, is made up of one second resistance and one the 3rd resistant series.
As preferably, described control unit comprises:
Control part, has input and output, and its input is coupled to the output of described detecting unit;
Operate portions, has input, and input is coupled to the output of described control part to receive this control signal.
As preferably, described control part comprises:
One triode, its base stage is coupled to the output of described detecting unit, and collector electrode is coupled to a VCC power supply;
One relay, have low pressure input and dynamic tactile switch, its low pressure input is coupled between the emitter of described triode and an earth terminal, and dynamic tactile switch is coupled to the input of described operate portions.
As preferably, described operate portions is made up of a resistance, a motor, a control switch and a VCC power sources in series.
As preferably, described alarm unit comprises a buzzer, has input, and its input is coupled to the output of described detecting unit.
As preferably, described drive unit comprises:
Extension spring post, is separately positioned on the afterbody of two described brush-boxs;
Extension spring, an extension spring post is respectively fixed at two ends;
Limited post, activity runs through the head of described carbon brush holder;
Motor, is coupled to described control circuit;
Gear, the axle that described geared sleeve is located at described motor is fixedly connected with motor shaft;
Tooth bar, described tooth bar to be arranged on described limited post and with described gears meshing.
As preferably, the both sides of the head of described carbon brush holder are also connected with block respectively.
As preferably, described second resistance or the 3rd resistance are a slide rheostat.
The utility model hinge structure is compared to be had: connect an extension spring at the afterbody of two carbon brush, and when normally working, allow afterbody open by limited post, extension spring is subject to the tension force that afterbody gives.Then whether overheatedly react carbon brush by a detecting unit, then determine whether that driver allows carbon brush be separated with collector ring by a control unit.Like this, when carbon brush is overheated, detecting unit exports an alarm signal to control unit, control unit is allowed to output signal the drive unit work that allows, carbon brush is separated automatically with collector ring, and give the alarm, remind maintenance personal's carbon brush overheated, so just can prevent from, because carbon brush is overheated, unfavorable situation occurs.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model carbon brush holder embodiment;
State diagram when Fig. 2 is the work of the utility model carbon brush holder;
State diagram when Fig. 3 is the alarm of the utility model carbon brush holder;
Fig. 4 is the drive unit schematic diagram of the utility model carbon brush holder when normally working;
Drive unit state diagram when Fig. 5 is the alarm of the utility model brush holder;
Fig. 6 is the state diagram of control switch when carbon brush normally works;
Fig. 7 is the state diagram of control switch when alarm state;
Fig. 8 is the control circuit figure of embodiment 1;
Fig. 9 is the detection cell circuit figure of control circuit;
Figure 10 is the test section circuit diagram of detecting unit;
Figure 11 is the control unit circuit diagram of control circuit;
Figure 12 is the control circuit figure of embodiment 2.
In figure: 1, carbon brush; 2, brush-box; 21, extension spring post; 3, carbon brush holder; 31, ear; 32, spacing hole; 4, extension spring; 5, alignment pin; 6, drive unit; 61, motor; 62, gear; 63, tooth bar; 7, limited post; 8, bumping post.
Embodiment
Referring to figs. 1 through Figure 12, the utility model carbon brush holder embodiment is described further.
Embodiment 1: a kind of carbon brush holder, comprise carbon brush 1, two brush-boxs 2 and carbon brush holder 3, a carbon brush 1 is respectively installed in two brush-boxs 2, two brush-boxs 2 are respectively provided with an ear 31 near the side of brush-box 2, the head of two ears 31 and carbon brush holder 3 is rotationally connected by alignment pin 5, such brush-box 2 can rotate relative to carbon brush holder 3, can may wear to a certain degree at carbon brush 1 like this, making carbon brush 1 and collector ring still can keep good contacting by rotating, avoiding because both loose contacts produce more heat.
Drive unit 6 comprises: a motor 61, is coupled to control circuit, is used to provide gear-driven power; A gear 62, gear 62 is enclosed within motor 61 axle, and fixes connection with motor 61 axle by screw thread; A tooth bar 63, tooth bar 63 is arranged on limited post 7, and is engage with gear 62.
The both sides of the head of carbon brush holder 3 are also respectively equipped with a bumping post 8, like this when temperature is too high, two brush-boxs 2 rotate under the effect of extension spring 4, and have the trend of collision, and the existence of bumping post 8 just can ensure that two brush-boxs 2 are after rotating to an angle, blocked by bumping post 8, namely brush-box 2 stops the rotation, and avoids the problem causing carbon brush 1 to come off because of collision.
The afterbody of two brush-boxs 2 is respectively provided with between extension spring 4 post 21, two extension spring 4 posts 21 and is connected with an extension spring 4, the two ends of extension spring 4 are respectively fixed on extension spring 4 post 21.Two ears 31 are provided with a spacing hole 32, the head of carbon brush holder 3 is respectively provided with a limited post 7 near the position of two ears 31, limited post 7 be all run through carbon brush holder 3 and can relatively carbon brush holder 3 activity through spacing hole 32, like this when carbon brush 1 normally works, brush-box 2 is limited by limited post 7, make loose contact between carbon brush 1 and collector ring because brush-box 2 produces rotation when preventing from normally working, and then cause carbon brush 1 overheated, affect the useful life of carbon brush 1.
The other end of relative two ears 31 of carbon brush holder 3 is provided with a drive unit 6, and drive unit 6 is used to drive limited post 7 can carbon brush holder 3 activity relatively.Carbon brush holder 3 is also provided with a control circuit, is used to the work of accessory drive 6.
Control circuit is divided into these three unit of detecting unit 100, control unit 300 and alarm unit 200.
Detecting unit 100, has output, is used for detecting the temperature of carbon brush 1, then exports the control signal of a high potential or electronegative potential at its output;
Control unit 300, has:
Input, is coupled on the output of detecting unit 100, is used for receiving the control signal of this high potential or electronegative potential;
Output, is coupled to the supply terminals of drive unit 6;
Alarm unit 200, has:
Input, is coupled on the output of detecting unit 100, is used for receiving the control signal of this high potential or electronegative potential.
When carbon brush 1 temperature is low, the output of detecting unit 100 exports a low-potential signal, the input of control unit 300 also just receives this low-potential signal, output also just exports an open circuit control signal, drive unit 6 does not work, and limited post 7 is fixed in spacing hole 32, and brush-box 2 cannot rotate under the effect of limited post 7, also just make carbon brush 1 normally contact with collector ring, carbon brush 1 normally works; Now the input of alarm unit 200 also receives this low-potential signal, and siren does not also work.
When carbon brush 1 temperature is too high, the output of detecting unit 100 exports a high potential signal, the input of control unit 300 also just receives this high potential signal, output also just exports a path control signal, drive unit 6 works and drives limited post 7 movable until throw off with spacing hole 32, brush-box 2 rotates under the effect of afterbody extension spring 4, and carbon brush 1 is separated with collector ring; Now the input of alarm unit 200 also receives this high potential signal, siren work, reminds staff should notice that carbon brush 1 temperature is too high, thus also just can reach and prevent the too high problem bringing heating of carbon brush 1 temperature.
Detecting unit 100 can be divided into test section 110, comparing section 120 two parts.
Test section 110 is an electric bridge, is divided into:
First point of splenium 111, in series by thermistor Rt and the first resistance R1;
Second point of splenium 112, in series by the second resistance R2 and the 3rd resistance Rp;
Wherein, the resistance of the first resistance R1, the second resistance R2 is equal, 3rd resistance is a slide rheostat Rp, electric bridge is followed in series to form by thermistor Rt, the first resistance R1, the second resistance R2 and slide rheostat Rp, a VCC supply coupling is between thermistor Rt and the first resistance R1, between ground terminal to the second resistance R2 and slide rheostat Rp, VCC power supply is 5V.
Although the resistance-temperature curve of thermistor Rt non-linear relation, but its value and temperature still have relation one to one, setting safe temperature can be passed through like this, for example require that carbon brush 1 temperature can not more than 80 degree, then by resistance-temperature profile, find out the resistance of Rt 80 degree time, then determine the resistance of slide rheostat Rp.So just by regulating the resistance of slip variable resistance Rp device to reach the operating state that a carbon brush 1 meets different temperatures requirement.
First output is coupled between thermistor Rt and the first resistance R1, is used for the first electric potential signal that output detections arrives
Second output is coupled between the second resistance R2 and slide rheostat Rp, is used for the second electric potential signal that output detections arrives.
Comparing section 120 is the voltage comparators be made up of operational amplifier, and the model of operational amplifier is LM358, and it has:
An in-phase input end a, is coupled to the second output of test section;
An inverting input b, is coupled in the first input end of test section;
An output, is used for exporting the control signal of high potential or electronegative potential.
Thermistor Rt is a kind of PTC type thermistor, and it is pasted onto on carbon brush 1, is in brush-box 2, can ensure that the temperature difference of carbon brush 1 and thermistor Rt can not be excessive like this, and makes the signal errors of output excessive.So just by detecting the temperature of thermistor Rt, obtain the temperature of carbon brush 1.
When carbon brush 1 temperature is low, thermistor Rt resistance is little, first output of test section 110 exports high potential signal, be input to the inverting input of operational amplifier, now the second output exports a high potential signal, be input to in-phase input end, the output of operational amplifier exports an electronegative potential control signal.
During carbon brush 1 temperature height, thermistor Rt resistance is large, first output of test section 110 exports a low-potential signal, be input to the inverting input of operational amplifier, now the second output exports a high potential signal, be input to in-phase input end, the output of operational amplifier just can export a high potential control signal.
This makes it possible to realize by thermistor Rt the object that automatically controls control unit and alarm unit.
Control unit 300 can be divided into control part 310 and operate portions 320 two parts.
Control part 310 comprises:
A NPN type triode, its base stage is coupled on the output of detecting unit 100, and collector electrode is coupled to a VCC power supply, and VCC power supply is 5V;
An electromagnetic relay, has:
A low pressure input, is coupled between the emitter of triode and an earth terminal;
A dynamic tactile K switch, is coupled to the input of operate portions 320;
Operate portions is made up of a fixed value resistance R0, a motor 61, control switch S and VCC power sources in series, and VCC power supply is 5V, has:
An input, is coupled on the output of control part 310, the control signal that the output being used for receiving control part 310 exports.
Control switch S has an a fixed contact S1 and moving contact S2, and when carbon brush 1 normally works, fixed contact S1 and moving contact S2 is in closure state, and when alarm state, the limited post 7 of moving contact S2 clashes into, and moving contact S2 is separated with fixed contact S1.
When carbon brush 1 temperature is low, control switch S is in closure state, the base stage of triode receives the low-potential signal that detecting unit 100 output exports, triode cannot conducting, coil no current in electromagnetic relay is passed through, also dynamic K switch of touching just cannot be attracted to close, and now although control switch S is in closure state, but operate portions 320 is still in off state, namely now motor 61 does not turn, now limited post 7 also just can be stuck in spacing hole 32, brush-box 2 cannot rotate, thus carbon brush 1 can be allowed normally to work, and the input input of alarm unit 200 is also low-potential signal, siren does not also work.
During carbon brush 1 temperature height, the base stage of triode receives the high potential signal that detecting unit 100 output exports, triode ON, coil in electromagnetic relay has electric current to pass through, dynamic K switch of touching is attracted to close, now control switch S is still in closed state, thus operate portions is in conducting state, namely now motor 61 works, drive unit 6 is allowed to drive limited post 7 move and depart from spacing hole 32 gradually, after departing from, brush-box 2 rotates around alignment pin 5 under the pulling force effect of afterbody extension spring 4, carbon brush 1 also will be separated with collector ring, what now the input of alarm unit 200 inputted is also high potential signal, siren works, remind staff's carbon brush 1 temperature too high, the work of drive unit 6 is so just realized by electromagnetic relay, and then an object preventing carbon brush 1 temperature too high can be reached.After carbon brush 1 is separated with collector ring, limited post 7 striking control switch S, makes control switch S be in the state of disconnection, so just can make operate portions 320 open circuit, thus realizes drive unit 6 and quit work.
Alarm unit 200 is in series by a buzzer HA, a fixed value resistance R0, and have input, its input is coupled to the output of detecting unit 100.
When carbon brush 1 temperature is low, what input inputted is a low-potential signal, and buzzer is sounding not, when carbon brush 1 temperature height, the output of detecting unit 100 exports a high potential signal, and inputs to buzzer input, now buzzer sends the sound, reminds the temperature of staff's carbon brush 1 too high.
Embodiment 2: circuit roughly framework as described in Example 1, its difference is with lower part:
The test section 110 of detecting unit 100 is in series by a PTC type thermistor Rt and certain value resistance R0, and be coupled between a VCC power supply and earth terminal after both series connection, VCC supply voltage is 5V;
The comparing section 120 of detecting unit 100 is made up of a three-terminal voltage-stabilizing pipe and a fixed value resistance R1, the model of voltage-stabiliser tube is TL431, its earth terminal ground connection, input is coupled between thermistor Rt and fixed value resistance R0, output is coupled to a VCC power supply, fixed value resistance R1 is coupled between VCC power supply and voltage-stabiliser tube, and VCC supply voltage is 5V.
The control part 310 of control unit 300 is made up of a PMOS, certain value resistance R3 and an optocoupler, the model of PMOS is 2N7002E, its grid G is coupled between voltage-stabiliser tube and fixed value resistance R1, drain D is coupled to earth terminal, and source S is coupled to a VCC power supply, and fixed value resistance R3 is coupled between the source S of PMOS and VCC power supply, VCC supply voltage is 5V, the model of optocoupler is 2N7002E, and the positive pole transmitting terminal of optocoupler is coupled to the source S of PMOS, negative pole transmitting terminal ground connection;
The operate portions 320 of control unit 300 is made up of certain value resistance R0, motor 61, control switch K and a VCC power sources in series, and VCC power supply is 5V, and the receiving terminal of optocoupler is coupled in this series circuit.
When carbon brush 1 temperature raises, thermistor Rt resistance becomes large, its two ends divide voltage also become large thereupon, the voltage at fixed value resistance R0 two ends just diminishes, when the voltage at RO two ends is lower than reference voltage in shunt regulator, shunt regulator cannot conducting, and now the input terminal voltage of buzzer HA is high level, sound the alarm, reach the object of reminding staff; Meanwhile, the grid G voltage of the PMOS of control unit 300 is also high level, and PMOS cannot conducting, and source S is in a high potential state, the positive pole transmitting terminal of an optocoupler also just input high potential signal, due to negative pole transmitting terminal ground connection, thus optocoupler conducting; Control switch K is initially in closure state; the conducting of optocoupler; make the operate portions conducting of control unit; motor 61 works; drive unit 6 is made to drive limited post 7 move and depart from spacing hole 32 gradually; after departing from, brush-box 2 rotates around alignment pin 5 under the pulling force effect of afterbody extension spring 4, and carbon brush 1 also will be separated with collector ring, thus reaches the object that protection carbon brush 1 temperature can not be too high.
After carbon brush 1 is separated with collector ring, limited post 7 striking control switch S, makes control switch S be in the state of disconnection, so just can make operate portions 320 open circuit, thus motor 61 quits work, and also just realizes drive unit 6 and quits work.
Otherwise when carbon brush 1 temperature is low, buzzer is sound not, motor 61 does not also work simultaneously, and namely drive unit 6 does not also just work.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. a carbon brush holder, comprise carbon brush, two brush-boxs and carbon brush holder, respectively carbon brush is provided with in described brush-box, two described brush-boxs are respectively provided with ear near the side of carbon brush holder, described ear and carbon brush holder are rotationally connected, it is characterized in that: described carbon brush holder is provided with and can makes the drive unit that described in two, brush-box afterbody is adjacent to each other, described carbon brush holder being also provided with the control circuit for controlling described drive unit
Described control circuit comprises:
Detecting unit, has output, detects the temperature of carbon brush and exports a control signal at its output;
Control unit, has input and output, and its input is coupled to the output of described detecting unit to receive this control signal, and output is coupled to the supply terminals of described drive unit;
Alarm unit, has input, and its input is coupled to the output of described detecting unit to receive this control signal.
2. carbon brush holder according to claim 1, is characterized in that: described detecting unit comprises:
Test section, has:
First output, exports the first electric potential signal;
Second output, exports the second electric potential signal;
Comparing section, has:
In-phase input end, is coupled to described second output;
Inverting input, is coupled to described first input end;
Output, exports control signal.
3. carbon brush holder according to claim 2, is characterized in that: described test section comprises:
First point of splenium, by one first resistance and a thermistor in series;
Second point of splenium, is made up of one second resistance and one the 3rd resistant series.
4. carbon brush holder according to claim 1, is characterized in that: described control unit comprises:
Control part, has input and output, and its input is coupled to the output of described detecting unit;
Operate portions, has input, and input is coupled to the output of described control part to receive this control signal.
5. carbon brush holder according to claim 4, is characterized in that: described control part comprises:
One triode, its base stage is coupled to the output of described detecting unit, and collector electrode is coupled to a VCC power supply;
One relay, have low pressure input and dynamic tactile switch, its low pressure input is coupled between the emitter of described triode and an earth terminal, and dynamic tactile switch is coupled to the input of described operate portions.
6. carbon brush holder according to claim 4, is characterized in that: described operate portions is made up of a resistance, a motor, a control switch and a VCC power sources in series.
7. carbon brush holder according to claim 1, is characterized in that: described alarm unit comprises a buzzer, has input, and its input is coupled to the output of described detecting unit.
8. carbon brush holder according to claim 1, is characterized in that: described drive unit comprises:
Extension spring post, is separately positioned on the afterbody of two described brush-boxs;
Extension spring, an extension spring post is respectively fixed at two ends;
Limited post, activity runs through the head of described carbon brush holder;
Motor, is coupled to described control circuit;
Gear, the axle that described geared sleeve is located at described motor is fixedly connected with motor shaft;
Tooth bar, described tooth bar to be arranged on described limited post and with described gears meshing.
9. carbon brush holder according to claim 1, is characterized in that: the both sides of the head of described carbon brush holder are also connected with block respectively.
10. carbon brush holder according to claim 3, is characterized in that: described 3rd resistance is slide rheostat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420487554.4U CN204118439U (en) | 2014-08-27 | 2014-08-27 | Carbon brush holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420487554.4U CN204118439U (en) | 2014-08-27 | 2014-08-27 | Carbon brush holder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204118439U true CN204118439U (en) | 2015-01-21 |
Family
ID=52335719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420487554.4U Expired - Fee Related CN204118439U (en) | 2014-08-27 | 2014-08-27 | Carbon brush holder |
Country Status (1)
| Country | Link |
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| CN (1) | CN204118439U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655635A (en) * | 2016-12-13 | 2017-05-10 | 北京三电机系统有限责任公司 | Collecting ring cooling structure and use method therefor |
| CN106655636A (en) * | 2016-12-13 | 2017-05-10 | 北京三电机系统有限责任公司 | Collecting ring apparatus and wind driven generator |
| CN107370004A (en) * | 2017-07-12 | 2017-11-21 | 河南中烟工业有限责任公司 | A kind of current-collector carbon brush holder quick-release arrangement |
| CN108306441A (en) * | 2018-04-08 | 2018-07-20 | 重庆奥兴嘉科技有限公司 | A kind of multipurpose motor brush holder |
| CN108390228A (en) * | 2018-01-12 | 2018-08-10 | 武汉船用机械有限责任公司 | Brushgear for shafting |
| CN112923837A (en) * | 2019-12-06 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Device for detecting abrasion loss of sliding block of side-pressure type traveling crane current collector |
-
2014
- 2014-08-27 CN CN201420487554.4U patent/CN204118439U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655635A (en) * | 2016-12-13 | 2017-05-10 | 北京三电机系统有限责任公司 | Collecting ring cooling structure and use method therefor |
| CN106655636A (en) * | 2016-12-13 | 2017-05-10 | 北京三电机系统有限责任公司 | Collecting ring apparatus and wind driven generator |
| CN107370004A (en) * | 2017-07-12 | 2017-11-21 | 河南中烟工业有限责任公司 | A kind of current-collector carbon brush holder quick-release arrangement |
| CN108390228A (en) * | 2018-01-12 | 2018-08-10 | 武汉船用机械有限责任公司 | Brushgear for shafting |
| CN108306441A (en) * | 2018-04-08 | 2018-07-20 | 重庆奥兴嘉科技有限公司 | A kind of multipurpose motor brush holder |
| CN108306441B (en) * | 2018-04-08 | 2023-11-07 | 重庆奥兴嘉科技有限公司 | Multipurpose motor brush holder |
| CN112923837A (en) * | 2019-12-06 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Device for detecting abrasion loss of sliding block of side-pressure type traveling crane current collector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20150827 |
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| EXPY | Termination of patent right or utility model |