CN109342040B - Clamping force detection device and method of brake - Google Patents
Clamping force detection device and method of brake Download PDFInfo
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- CN109342040B CN109342040B CN201811320174.0A CN201811320174A CN109342040B CN 109342040 B CN109342040 B CN 109342040B CN 201811320174 A CN201811320174 A CN 201811320174A CN 109342040 B CN109342040 B CN 109342040B
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- 238000007599 discharging Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 14
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention provides a clamping force detection device and a clamping force detection method of a brake, and relates to the technical field of brake testing devices. The clamping force detection device of the brake comprises: the device comprises a longitudinal adjusting module and a vertical adjusting module, wherein the longitudinal adjusting module and the vertical adjusting module can adjust the position of the false disk module. The brake mounting interface module comprises a brake system type tool. False dish module, false dish module include sensor fixing base, wide range weighing sensor, small-scale range weighing sensor, dish spring base, dish spring, fly leaf and fly leaf fixing base, and dish spring base sets up in the sensor fixing base and is located small-scale range weighing sensor place side, and the dish spring sets up in dish spring base, and the fly leaf sets up in fly leaf fixing base and is located wide range sensor place side, and false dish module can be held in the palm the centre gripping by the stopper brake lining of the unified frock of stopper. The invention realizes the accurate measurement of the clamping force of the brake.
Description
Technical Field
The invention relates to the technical field of brake testing devices, in particular to a clamping force detection device and a clamping force detection method of a brake.
Background
The brake is one of the key components of the brake system and plays an important role in the safe operation of the vehicle. Therefore, the brake clamping force test is important.
At present, brake test beds developed in China are routine test beds, force measuring errors are small when clamping force is large, and errors exceed test standard requirements in small clamping force ranges. The clamping force of the brake plays an important role in the braking performance, the small clamping force can cause small braking torque and influence the braking performance of the brake, the overlarge clamping force can cause the locking of wheels to slide and drag on the roadside, so that the abrasion of the tires of the wheels is serious, the braking performance of the brake is influenced, and traffic accidents can be caused seriously. Therefore, it is necessary to develop a brake detection device with high clamping force testing accuracy.
Disclosure of Invention
The invention aims to provide a clamping force detection device of a brake, which can be used for carrying out clamping force test on the brake in a full range with high precision.
Another object of the present invention is to provide a method for detecting a clamping force of a brake, which uses the above-mentioned device for detecting a clamping force of a brake, and which can ensure a test accuracy even when a tested clamping force is small.
The embodiment of the invention is realized by the following steps:
an embodiment of the present invention provides a clamping force detecting device of a brake, including:
the longitudinal adjusting module comprises a moving platform and a longitudinal adjusting guide rail, and the longitudinal adjusting guide rail is arranged on the moving platform;
the brake mounting interface module is arranged at one end, far away from the longitudinal adjusting guide rail, of the mobile platform and comprises a brake system type tool;
the fake plate module comprises a sensor fixing seat, a large-range weighing sensor, a small-range weighing sensor, a disc spring base, a disc spring, a movable plate and a movable plate fixing seat, wherein the large-range weighing sensor and the small-range weighing sensor are oppositely arranged on the sensor fixing seat, the disc spring base is arranged on the sensor fixing seat and is positioned on the side where the small-range weighing sensor is located, the disc spring is arranged on the disc spring base, the movable plate is arranged on the movable plate fixing seat and is positioned on the side where the large-range weighing sensor is located, and the fake plate module can be clamped by a brake disc support of the brake system tool;
vertical adjusting module, vertical adjusting module set up in moving platform, the fly leaf fixing base set up in vertical adjusting module, the sensor fixing base set up in vertical adjusting module just can pass through vertical adjusting module is in the perpendicular to the direction of moving platform's top surface removes, vertical adjusting module can also drive false dish module along longitudinal adjustment guide rail towards the removal of the general type frock of stopper.
In addition, the clamping force detection device for the brake provided by the embodiment of the invention can also have the following additional technical characteristics:
in an alternative embodiment of the present invention, the sensor fixing base has a first base groove and a second base groove partitioned by a partition plate, the large-range load cell is fixed to the first base groove, and the small-range load cell is fixed to the second base groove.
In an optional embodiment of the invention, a mounting seat groove is formed in the middle of the small-range weighing sensor, and the disc spring base comprises a mounting protrusion which is clamped in the mounting seat groove.
In an alternative embodiment of the present invention, the wide-range load cell is fixedly connected to the sensor holder by at least two bolts arranged side by side, and the small-range load cell is fixedly connected to the sensor holder by at least two bolts arranged side by side.
In an optional embodiment of the present invention, the vertical adjustment module includes a vertical adjustment base, a vertical adjustment screw, a vertical adjustment moving platform, a moving plate guide rail, and a vertical adjustment moving platform guide rail;
the vertical adjustment lead screw rotationally wears to locate the vertical adjustment base member, the axial perpendicular to of vertical adjustment lead screw moving platform, the fly leaf fixing base connect in the fly leaf guide rail, vertical adjustment moving platform slidable set up in the vertical adjustment moving platform guide rail, vertical adjustment moving platform guide rail set up in the vertical adjustment base member, vertical adjustment base member slidable set up in vertical adjustment guide rail.
In an optional embodiment of the present invention, the brake mounting interface module further includes an upright, a mounting guide pin, and a connecting block, the upright is fixed to the moving platform, the brake assembly is fixed to the connecting block, and the connecting block is mounted on the upright in a positioning manner through the mounting guide pin.
In an alternative embodiment of the invention, the upright is fixed to the moving platform through four bolts, and the connecting block is fixedly connected to the brake system type tool through two bolts.
An embodiment of the present invention provides a clamping force detection method of a brake, using the clamping force detection device of the brake, including:
adjusting the false disc module to the stress center of the brake pad support;
charging and discharging air to a brake cylinder of a brake to be detected according to preset air pressure and determining a reference clamping force value F;
and inflating the brake cylinder by using different air pressure values and reading the numerical value of the large-range weighing sensor or the numerical value of the small-range weighing sensor.
In an alternative embodiment of the present invention, the preset air pressure is 200 Kpa.
In an optional embodiment of the invention, when the air pressure value charged into the brake cylinder is lower than the preset air pressure, the clamping force is smaller than F, and at this time, the numerical value of the small-range weighing sensor is read;
and when the air pressure value charged into the brake cylinder is higher than the preset air pressure, the clamping force is larger than F, and at the moment, the numerical value of the wide-range weighing sensor is read.
The invention has the beneficial effects that:
compared with the traditional brake detection test device, the clamping force detection device of the brake has the advantages that the false disc module realizes the accurate measurement of the clamping force of the brake by arranging the large and small measuring range weighing sensor and the disc spring device. The design principle of the invention can completely meet the test requirements. The detection method based on the clamping force detection device of the brake can enable the detection to be accurate and reliable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a clamping force detection device of a brake according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a brake mounting interface module.
Fig. 3 is a schematic structural diagram of the dummy disc module.
Fig. 4 is a schematic structural diagram of the vertical adjustment module.
Fig. 5 is a schematic structural diagram of the longitudinal adjustment module.
Figure 6 schematic diagram of the clamping force test.
Fig. 7 is a partially enlarged view of a portion a of fig. 6.
Icon: 100-clamping force detection means of the brake; 10-brake mounting interface module; 11-upright post; 12-installing a guide pin; 13-connecting block; 14-brake system type tooling; 20-false disk module; 21-a movable plate fixing seat; 22-sensor holder; 23-a movable plate; 24-wide range load cell; 25-a small-range weighing sensor; 26-disc spring base; 27-a disc spring; 28 a-left brake pad holder; 30-a vertical adjustment module; 31-vertically adjusting the matrix; 32-vertically adjusting the lead screw; 33-movable plate guide rail; 34-vertically adjusting the moving platform; 35-vertically adjusting the moving platform guide rail; 40-longitudinal adjustment module; 41-longitudinal adjustment of the guide rail; 50-moving the platform.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1 to 7, the present embodiment provides a clamping force detecting device for a brake, including:
the longitudinal adjusting module 40, the longitudinal adjusting module 40 includes a moving platform 50 and a longitudinal adjusting guide rail 41, the longitudinal adjusting guide rail 41 is disposed on the moving platform 50;
the brake mounting interface module 10 is arranged at one end, far away from the longitudinal adjusting guide rail 41, of the moving platform 50, and the brake mounting interface module 10 comprises a brake system type tool 14;
the disc brake system comprises a disc brake module 20, wherein the disc brake module 20 comprises a sensor fixing seat 22, a large-range weighing sensor 24, a small-range weighing sensor 25, a disc spring base 26, a disc spring 27, a movable plate 23 and a movable plate fixing seat 21, the large-range weighing sensor 24 and the small-range weighing sensor 25 are oppositely arranged on the sensor fixing seat 22, the disc spring base 26 is arranged on the sensor fixing seat 22 and is positioned at the side where the small-range weighing sensor 25 is located, the disc spring 27 is arranged on the disc spring base 26, the movable plate 23 is arranged on the movable plate fixing seat 21 and is positioned at the side where the large-range weighing sensor 24 is located, and the disc brake module 20 can be clamped by a;
the vertical adjustment module 30, the vertical adjustment module 30 is disposed on the moving platform 50, the movable plate fixing seat 21 is disposed on the vertical adjustment module 30, the sensor fixing seat 22 is disposed on the vertical adjustment module 30 and can move in a direction perpendicular to the top surface of the moving platform 50 through the vertical adjustment module 30, and the vertical adjustment module 30 can also drive the dummy disc module 20 to move towards the brake system type tool 14 along the longitudinal adjustment guide rail 41.
Specifically, the sensor holder 22 has a first seat groove and a second seat groove partitioned by a partition plate, the wide-range load cell 24 is fixed to the first seat groove, and the small-range load cell 25 is fixed to the second seat groove.
The middle part of the small-range weighing sensor 25 is provided with a mounting seat groove, and the disc spring base 26 comprises a mounting protrusion which is clamped in the mounting seat groove.
Wide-range load cell 24 is through the bolt fixed connection that at least two set up side by side in sensor fixing base 22, and small-range load cell 25 is through the bolt fixed connection that at least two set up side by side in sensor fixing base 22.
Specifically, the vertical adjustment module 30 includes a vertical adjustment base 31, a vertical adjustment screw 32, a vertical adjustment moving platform 34, a moving plate 23 guide rail 33, and a vertical adjustment moving platform guide rail 35;
the vertical adjustment screw 32 is rotatably disposed through the vertical adjustment base 31, an axial direction of the vertical adjustment screw 32 is perpendicular to the movable platform 50, the movable plate fixing seat 21 is connected to the movable plate 23 guide rail 33, the vertical adjustment movable platform 34 is slidably disposed on the vertical adjustment movable platform guide rail 35, the vertical adjustment movable platform guide rail 35 is disposed on the vertical adjustment base 31, and the vertical adjustment base 31 is slidably disposed on the vertical adjustment guide rail 41.
Specifically, the brake mounting interface module 10 further includes an upright post 11, a mounting guide pin 12 and a connecting block 13, the upright post 11 is fixed to the moving platform 50, the brake system type tool 14 is fixed to the connecting block 13, and the connecting block 13 is fixed to the upright post 11 through the mounting guide pin 12.
Specifically, the upright 11 is fixed to the moving platform 50 by four bolts, and the connecting block 13 is fixedly connected to the brake system type tool 14 by two bolts.
After the brake is loaded or in normal operation, the brake has two working states, one is a braking state and the other is a releasing state, the braking state is a state of applying braking force when the vehicle is stopped, and the releasing state refers to the initial loading position of the brake.
In addition, the method for detecting the clamping force of the brake, which detects the brake by using the clamping force detection device of the brake, comprises the following steps:
adjusting the false disc module 20 to the stress center of the brake pad holder;
charging and discharging air to a brake cylinder of a brake to be detected according to preset air pressure and determining a reference clamping force value F;
the brake cylinders are inflated with different air pressure values and the value of the wide range load cell 24 or the value of the narrow range load cell 25 is read.
When F is determined, the brake cylinder is repeatedly charged and discharged to relieve the brake for a plurality of times until the clearance between the brake pad holder and the false disc module 20 is unchanged.
Specifically, the preset air pressure is 200 Kpa.
Specifically, when the air pressure value charged into the brake cylinder is lower than the preset air pressure, the clamping force is smaller than F, and at the moment, the numerical value of the small-range weighing sensor 25 is read;
when the air pressure value of the brake cylinder is higher than the preset air pressure, the clamping force is larger than F, and the numerical value of the wide-range weighing sensor 24 is read.
Such as:
when the brake cylinder is charged with air pressure of 100Kpa, the brake pad moves, so that a load is applied to the movable plate 23 and the end surface of the disc spring 27, and the load is applied to the sensor through the transmission of the load. After the values of the large-range weighing sensor 24 and the small-range weighing sensor 25 are stable, because the clamping force is small when the air pressure is small, a gap X is formed between the left brake pad support 28a and the end surface of the sensor fixing seat 22 under the action of the disc spring 27, as shown in fig. 7. Under the working condition, the clamping force is not greater than the F, and the numerical value of the small-range weighing sensor 25 is 3.5KN, namely the corresponding clamping force value under the air pressure.
When the brake cylinder is charged with air pressure of 500Kpa, the brake pad moves, so that a load is applied to the movable plate 23 and the end surface of the disc spring 27, and the load is applied to the sensor through the transmission of the load. After the values of the wide-range weighing sensor 24 and the small-range weighing sensor 25 are stable, because the clamping force is large when the air pressure is large, the left brake pad support 28a completely overcomes the effect of the disc spring 27 and is completely contacted with the end face of the sensor fixing seat 22, the part exceeding the force F is borne by the sensor fixing seat 22, the clamping force is larger than the force F under the working condition, and the value of the wide-range weighing sensor 24 is 23.5KN, namely the corresponding clamping force value under the air pressure.
The range span of the measured clamping force is large, and is generally (0-30) kN. The invention adopts the large and small measuring range weighing sensors arranged on the left and right sides. By reasonably selecting the disc spring 27 and the measuring ranges of the left sensor and the right sensor. The full-range high-precision test of the clamping force of the brake can be realized.
Compared with the traditional brake detection test device, the clamping force detection device of the brake provided by the invention has the advantages that the false disc module 20 realizes the accurate measurement of the clamping force of the brake by arranging the large and small measuring range weighing sensor and the disc spring 27 device. The design principle of the invention can completely meet the test requirements. The detection method based on the clamping force detection device of the brake can enable the detection to be accurate and reliable.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A clamping force detecting device of a brake, comprising:
the longitudinal adjusting module comprises a moving platform and a longitudinal adjusting guide rail, and the longitudinal adjusting guide rail is arranged on the moving platform;
the brake mounting interface module is arranged at one end, far away from the longitudinal adjusting guide rail, of the mobile platform and comprises a brake system type tool;
the fake plate module comprises a sensor fixing seat, a large-range weighing sensor, a small-range weighing sensor, a disc spring base, a disc spring, a movable plate and a movable plate fixing seat, wherein the large-range weighing sensor and the small-range weighing sensor are oppositely arranged on the sensor fixing seat, the disc spring base is arranged on the sensor fixing seat and is positioned on the side where the small-range weighing sensor is located, the disc spring is arranged on the disc spring base, the movable plate is arranged on the movable plate fixing seat and is positioned on the side where the large-range weighing sensor is located, and the fake plate module can be clamped by a brake disc support of the brake system tool;
vertical adjusting module, vertical adjusting module set up in moving platform, the fly leaf fixing base set up in vertical adjusting module, the sensor fixing base set up in vertical adjusting module just can pass through vertical adjusting module is in the perpendicular to the direction of moving platform's top surface removes, vertical adjusting module can also drive false dish module along longitudinal adjustment guide rail towards the removal of the general type frock of stopper.
2. The clamping force detecting device for a brake according to claim 1, wherein the sensor holder has a first recess and a second recess partitioned by a partition, the large-range load cell is fixed to the first recess, and the small-range load cell is fixed to the second recess.
3. The brake clamping force detecting device of claim 2, wherein the small-scale load cell has a mounting groove at a middle portion thereof, and the disc spring base includes a mounting protrusion, and the mounting protrusion is engaged with the mounting groove.
4. The brake clamping force detecting device according to claim 2, wherein the wide-range load cell is fixedly connected to the sensor holder by at least two bolts arranged side by side, and the narrow-range load cell is fixedly connected to the sensor holder by at least two bolts arranged side by side.
5. The device for detecting the clamping force of the brake as claimed in claim 1, wherein the vertical adjustment module comprises a vertical adjustment base, a vertical adjustment lead screw, a vertical adjustment moving platform, a moving plate guide rail and a vertical adjustment moving platform guide rail;
the vertical adjustment lead screw rotationally wears to locate the vertical adjustment base member, the axial perpendicular to of vertical adjustment lead screw moving platform, the fly leaf fixing base connect in the fly leaf guide rail, vertical adjustment moving platform slidable set up in the vertical adjustment moving platform guide rail, vertical adjustment moving platform guide rail set up in the vertical adjustment base member, vertical adjustment base member slidable set up in vertical adjustment guide rail.
6. The brake clamping force detecting device of claim 1, wherein said brake mounting interface module further comprises a vertical column, a mounting guide pin and a connecting block, said vertical column is fixed to said movable platform, said brake prototype tool is fixed to said connecting block, and said connecting block is fixed to said vertical column by said mounting guide pin.
7. The brake clamping force detecting device of claim 6, wherein the upright is fixed to the movable platform by four bolts, and the connecting block is fixedly connected to the brake system type tool by two bolts.
8. A clamping force detecting method of a brake, characterized in that the clamping force detecting device of the brake according to any one of claims 1 to 7 is used, the method comprising:
adjusting the false disc module to the stress center of the brake pad support;
charging and discharging air to a brake cylinder of a brake to be detected according to preset air pressure and determining a reference clamping force value F;
and inflating the brake cylinder by using different air pressure values and reading the numerical value of the large-range weighing sensor or the numerical value of the small-range weighing sensor.
9. The method of claim 8, wherein the predetermined air pressure is 200 Kpa.
10. The method for detecting the clamping force of the brake as claimed in claim 8, wherein when the air pressure value charged into the brake cylinder is lower than the preset air pressure, the clamping force is less than F, and the value of the small-scale load cell is read;
and when the air pressure value charged into the brake cylinder is higher than the preset air pressure, the clamping force is larger than F, and at the moment, the numerical value of the wide-range weighing sensor is read.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320174.0A CN109342040B (en) | 2018-11-07 | 2018-11-07 | Clamping force detection device and method of brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320174.0A CN109342040B (en) | 2018-11-07 | 2018-11-07 | Clamping force detection device and method of brake |
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| Publication Number | Publication Date |
|---|---|
| CN109342040A CN109342040A (en) | 2019-02-15 |
| CN109342040B true CN109342040B (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811320174.0A Active CN109342040B (en) | 2018-11-07 | 2018-11-07 | Clamping force detection device and method of brake |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100526833C (en) * | 2007-04-26 | 2009-08-12 | 中国矿业大学 | Disc type brake performance detection method and device |
| CN102840973B (en) * | 2012-09-07 | 2015-03-11 | 太原鹏跃电子科技有限公司 | Stress testing device for brake adjuster |
| DE102014013324A1 (en) * | 2014-09-15 | 2016-03-17 | Otto Nussbaum Gmbh & Co. Kg | Brake tester with low-voltage device |
| CN104406731B (en) * | 2014-12-13 | 2016-08-17 | 芜湖哈特机器人产业技术研究院有限公司 | A kind of clamping force detecting tool of brake caliper |
| CN204461666U (en) * | 2015-01-26 | 2015-07-08 | 南车洛阳机车有限公司 | Unit brake clamping force test tool |
| CN106840632B (en) * | 2017-02-15 | 2019-03-01 | 常州中车铁马科技实业有限公司 | A kind of detection device and detection method of high-speed train braking nipper units |
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Inventor after: Gou Qingbing Inventor after: Wang Yongsheng Inventor after: Liu Jian Inventor after: Wang Yanfei Inventor after: Zhang Jun Inventor after: Zhao Endong Inventor after: Gu Jiazhen Inventor before: Wang Yongsheng Inventor before: Liu Jian Inventor before: Wang Yanfei Inventor before: Zhang Jun Inventor before: Zhao Endong Inventor before: Gu Jiazhen |
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Address after: 213000 No.19 Shunyuan Road, Xuejia Town, Xinbei District, Changzhou City, Jiangsu Province Patentee after: CRRC CHANGZHOU TECH-MARK INDUSTRIAL Co.,Ltd. Country or region after: China Patentee after: CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co.,Ltd. Address before: 213000 No.19 Shunyuan Road, Xuejia Town, Xinbei District, Changzhou City, Jiangsu Province Patentee before: CRRC CHANGZHOU TECH-MARK INDUSTRIAL Co.,Ltd. Country or region before: China Patentee before: CRRC QISHUYAN INSTITUTE Co.,Ltd. |