A contact force measurement system and method for pantograph operation inspection and maintenance

Abstract

The present invention discloses a pantograph operation and maintenance contact force measurement system, comprising a lifting mass unit (16); a data processing device (7) arranged within the field of view of the lifting mass unit (16), the data processing device (7) comprising a positioning module, the positioning module comprising a coordinate measurement unit (8) and a timing unit (9), the coordinate measurement unit (8) comprising a magnetostrictive displacement sensor (4); the data processing device (7) comprising a control module connected to the positioning module in communication, the control module comprising a communication unit (10), a comprehensive calculation processing unit (11) and a display and output interface unit (12). The non-contact measurement of the present invention not only has high measurement accuracy, simple operation, reliable and portable equipment, but also is compatible with various vehicle models at the same time, has high controllability of on-site operation management and automatically generates work order resumes. It further provides a basic platform for expanding comprehensive data mining and analysis, realizing health management, etc.

Description

Technical Field

[0001] The present invention belongs to the field of operation and maintenance of electric train sets, and more specifically, relates to a contact force measurement system and method for operation and maintenance of pantographs. Background Art

[0002] High-speed railways receive electricity through the contact network of the pantograph, which is installed on the roof of the high-speed train as a current collecting device. The pantograph is the core component of the high-speed EMU to receive power from the contact network. Especially in the high-speed electrified railway system, a stable current receiving state must be maintained, which requires a certain contact pressure between the pantograph and the contact line. When the contact pressure is too large, the contact line is lifted too much, causing partial bending of the contact line, causing fatigue damage to the contact line, and increasing the wear of the contact line. In severe cases, it causes a pantograph-net accident; when the contact pressure between the pantograph and the contact network is too low, it is easy to be offline, the pantograph is separated from the contact line and an arc is generated, the EMU equipment is poorly powered and electromagnetic interference is aggravated.

[0003] At present, each EMU (vehicle) depot generally adopts manual measurement for pantograph contact force and pantograph raising and lowering time control during regular inspection and maintenance. The contact force measurement operation is as follows: First, the maintenance personnel go to the roof of the car, then hang a spring scale on the raised pantograph head, and use the spring scale to pull down at a uniform speed to obtain the pantograph lowering contact force; reduce the downward pulling force, let the pantograph slowly rise again, and obtain the pantograph raising contact force. Take three points in the process of rising and falling, measure six sets of data, and finally calculate the average value of the two forces, which is the approximate value of the contact force. This method has the following problems: (1) Manual measurement has certain human factors, the degree of standardization is not high, and it is not easy to manage. (2) It is difficult to ensure vertical downward and uniform movement by using the hand-pulling spring scale. Because the hand pull is unstable, the reading will also change. The operation results are recorded manually step by step, which is too cumbersome and difficult to achieve convenient generation of record sheets and automatic summary, mining and analysis of subsequent data. (3) The pantograph contact force automatic measurement equipment currently used on site generally adopts a motor drive solution, which has low reliability, is heavy, and is inconvenient to obtain power, transport the equipment on and off the roof, and move it between the tracks in the maintenance depot.

[0004] Therefore, the field urgently needs to propose an advanced and applicable pantograph operation and maintenance contact force measurement system and method, which can automatically obtain the result through non-contact measurement without manual measurement of the contact force. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a contact force measurement system and method for pantograph operation and maintenance, which can measure non-contactly, process and draw the pantograph raising and lowering height curves, pantograph bow head speed curves and pantograph bow head acceleration curves in real time, and calculate the pantograph raising contact force, pantograph lowering contact force, pantograph raising and lowering time and other parameters. It has high measurement accuracy, simple operation, high equipment reliability, portability and wide application in vehicle models. It can automatically generate work order records to save labor costs. It also provides a basic platform for expanding comprehensive data mining and analysis and realizing health management.

[0006] In order to achieve the above object, according to one aspect of the present invention, a pantograph operation and maintenance contact force measurement system is provided, comprising:

[0007] A lifting mass unit for hanging on the pantograph head;

[0008] A data processing device is provided within the visual range of the lifting mass unit, the data processing device comprises a positioning module, the positioning module comprises a coordinate measurement unit and a timing unit for synchronously measuring the time information of the lifting mass unit, the coordinate measurement unit comprises a magnetostrictive displacement sensor for measuring the position information of the lifting mass unit;

[0009] The data processing device includes a control module that is communicatively connected to the positioning module, and the control module includes a communication unit, a comprehensive calculation processing unit, and a display and output interface unit. The position information and time information of the lifting mass unit are communicated between the communication unit and the comprehensive calculation processing unit. The comprehensive calculation processing unit is used to process the position information and time information of the lifting mass unit, comprehensively calculate the pantograph's pantograph lowering contact force curve, pantograph raising contact force curve, average contact force curve, and pantograph raising and lowering time information, and perform standard judgments on the pantograph's contact force and time. At the same time, the pantograph's condition is judged in combination with the pantograph's action rhythm, comprehensive comparative analysis of historical measurement characteristics, and other comprehensive methods, and the pantograph's condition is displayed through the display and output interface unit and interconnected with the information system of the operating and maintenance unit.

[0010] Furthermore, the lifting mass unit includes a first weight, a second weight and a third weight, and the masses of the first weight, the second weight and the third weight can be selected according to the type of each EMU model, the model of the pantograph and the maintenance limit, or the pantograph lowering weight of the same model of EMU can also be configured by superimposing the pantograph raising weight and the differential weight.

[0011] Furthermore, the coordinate measurement unit includes a first weight tag provided on the first weight, a second weight tag provided on the second weight, and a third weight tag provided on the third weight.

[0012] Furthermore, the first weight tag, the second weight tag and the third weight tag are radio frequency, two-dimensional code or other tags that can be used for non-contact positioning technology identification, and the tags are marked with identifiable model information of the corresponding pantograph.

[0013] Furthermore, the first weight tag, the second weight tag and the third weight tag are movable magnetic rings.

[0014] Furthermore, the coordinate measurement unit is a non-contact measurement component formed by a laser measuring instrument or an image acquisition device.

[0015] Furthermore, the timing unit includes three pressure sensors, one is arranged between the first weight and the first weight tag, one is arranged between the second weight and the second weight tag, and one is arranged between the third weight and the third weight tag.

[0016] According to another aspect of the present invention, a pantograph contact force measurement method is provided, which is implemented by the system described above and includes the following steps:

[0017] S1: Hang a third weight on the pantograph head according to the model of the pantograph, and the data processing device automatically identifies the pantograph model information through the third weight tag, operates the pantograph, raises the pantograph, and measures the pantograph raising time t, and lowers the pantograph, and measures the pantograph lowering time t;

[0018] S2: After the pantograph is raised to the maximum working height, the pantograph is kept in the raised state, and a first weight is hung on the pantograph head according to the model of the pantograph. The pantograph is lowered by the gravity of the first weight, and the coordinate measurement unit synchronously obtains the position information of the first weight, and the timing unit synchronously obtains the time information of the first weight. The control module processes and displays the pantograph lowering height curve, the pantograph head speed curve, and the pantograph head acceleration curve;

[0019] S3: When the first weight stops descending, the first weight is removed and a second weight is hung on the pantograph head, the pantograph rises slowly, the coordinate measurement unit synchronously obtains the position information of the second weight, the timing unit synchronously obtains the time information of the second weight, and the control module processes and displays the pantograph raising height curve, the pantograph head speed curve and the pantograph head acceleration curve;

[0020] S4: The control module comprehensively verifies the performance indicators of the pantograph's static contact force and action rhythm time based on the pantograph model information, pantograph raising and lowering time, pantograph head descent and ascent acceleration curves, the pantograph head calculated mass and the mass of the lifting mass unit, according to the actual maintenance limit caliber requirements, makes judgments based on the standards, and performs comprehensive mining calculations to generate work records and judgment results, which are output through the display and output interface unit and interconnected with the information system of the operating maintenance unit.

[0021] Furthermore, in S2 and S3, the position information of the first weight, the second weight and the third weight is obtained by laser measurement or image restoration method, and the position information is transmitted to the comprehensive calculation processing unit through the communication unit.

[0022] Furthermore, the mass of the first weight is greater than the maximum pantograph lowering contact force limit value;

[0023] The mass of the second weight is less than the minimum pantograph contact force limit value;

[0024] The third weight is a lightweight weight for measuring the bow raising and lowering time, and its mass is 0.05kg to 0.1kg.

[0025] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0026] (1) The present invention studies and designs the structure of a configurable weight with adjustable mass, a positioning module and a control module and their specific settings. The pantograph is pulled down and up by a configurable weight with a fixed hanging mass. The time and displacement of the configurable weight when it descends or rises are obtained through the cooperation of the positioning module and the control module, so as to calculate the pantograph raising and lowering time, the contact force of the pantograph lowering and the contact force curve of the pantograph raising for comprehensive calculation and judgment. The contact force of the pantograph of the present invention is measured non-contactly to automatically obtain the result, with high accuracy, small human interference factors, high controllability of operation management, simple structure and convenient operation.

[0027] (2) The control module of the system of the present invention processes and plots the pantograph raising and lowering height curves, pantograph bow head speed curves and pantograph bow head acceleration curves in real time, and calculates the pantograph raising and lowering contact forces, pantograph raising and lowering time and other parameters, thereby realizing non-contact measurement with high measurement accuracy and automatic processing of measurement results, which is convenient and fast.

[0028] (3) The positioning module of the present invention includes a coordinate measurement unit and a timing unit, so as to accurately obtain the movement displacement and movement time of the adjustable weight, providing an accurate basis for the control module to calculate the pantograph contact force.

[0029] (4) The timing unit of the present invention is triggered by the coordinate measurement unit, so that the time obtained by the timing unit is consistent with the time of the configurable weight rising or falling movement, thereby improving the accuracy of the pantograph contact force measurement.

[0030] (5) The device and method of the present invention are compatible with the measurement requirements of multiple vehicle models and multiple different pantograph models, and are also very convenient for adaptive configuration according to the different requirements of different versions of maintenance regulations. Compared with the existing motor-driven pantograph contact force measurement device, it can automatically identify the information of the pantograph model, reducing manual input. Different vehicle models share a data processing unit, and only the weights are configured separately.

[0031] (6) The device of the present invention does not need to be powered by a power socket at the work site. The configurable quality unit can be directly managed at the work site without the need for up and down transportation. The data processing device is small in size and weight, and is highly portable for on-site operations.

[0032] (7) The device of the present invention has a simple structure, high reliability, and can be used in a wide range of vehicle models. It can avoid the impact of equipment failures on maintenance operations and automatically generate work order records, further providing a basic platform for expanding comprehensive data mining and analysis and realizing health management. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of a pantograph operation and maintenance contact force measurement system according to an embodiment of the present invention;

[0034] Figure 2 It is a structural schematic diagram of a typical single-arm pantograph involved in a pantograph operation and maintenance contact force measurement system according to an embodiment of the present invention;

[0035] Figure 3 It is a structural schematic diagram of a data processing device involved in a pantograph operation and maintenance contact force measurement system according to an embodiment of the present invention;

[0036] Figure 4 A flow chart of measuring contact force involved in a contact force measurement system for pantograph operation and maintenance according to an embodiment of the present invention;

[0037] Figure 5 is a contact force measurement curve (example) in an embodiment of the present invention;

[0038] Figure 6 The pantograph lowering height, pantograph head speed and acceleration curve when the pantograph is lowered in the embodiment of the present invention;

[0039] Figure 7 The pantograph raising height, pantograph head speed and acceleration curve are shown in the embodiment of the present invention.

[0040] In all the drawings, the same figure marks represent the same technical features, specifically: 1-pantograph, 101-bow head composition (including carbon slide plate), 102-upper frame, 103-lower frame, 104-lifting bow drive mechanism, 2-first weight, 3-first weight label, 4-magnetostrictive displacement sensor, 5-second weight, 6-second weight label, 7-data processing device, 8-coordinate measurement unit, 9-timing unit, 10-communication unit, 11-comprehensive calculation processing unit, 12-display and output interface unit, 13-third weight, 14-third weight label, 16-lifting mass unit. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] like Figure 1 As shown, an embodiment of the present invention provides a pantograph operation and maintenance contact force measurement system, including a lifting mass unit 16 and a data processing device 7. The lifting mass unit 16 is suspended on the bow head of the pantograph, and the data processing device 7 is arranged within the field of view of the lifting mass unit 16, so as to facilitate the measurement of the position and time information of the lifting mass unit 16. The data processing device 7 processes the position information and time information of the lifting mass unit, comprehensively calculates the pantograph lowering contact force curve, the raising pantograph contact force curve, the average contact force curve, and the raising pantograph time information of the pantograph, and performs standard judgment on the raising pantograph contact force and time. At the same time, the pantograph condition is comprehensively judged by combining the raising pantograph action rhythm, the comprehensive comparative analysis of the historical measurement characteristics, etc., and is displayed through the display and output interface unit and interconnected with the operation and maintenance unit information system. The present invention studies and designs the structure of the mass configurable weight, the positioning module and the control module and their specific setting methods, and accordingly pulls the pantograph to descend and ascend by hanging the configurable weight with a fixed mass, and obtains the descending or ascending time and displacement of the configurable weight through the cooperation of the positioning module and the control module, so as to calculate the pantograph raising and lowering time, the pantograph lowering contact force and the pantograph raising contact force curve for comprehensive calculation and judgment. The contact force of the pantograph of the present invention is measured non-contactly to automatically obtain the result, with high accuracy, small human interference factors, high controllability of operation management, simple structure and convenient operation.

[0043] like Figure 1As shown, the lifting mass unit 16 includes a first weight 2, a second weight 5 and a third weight 13. In order to adapt to different platform EMUs, according to the different pantograph contact forces, the weights of the first weight 2, the second weight 5 and the third weight 13 can be selected according to the model and maintenance limit of the pantograph 1 of each EMU model. The pantograph lowering weight of the same model EMU can also be configured by superimposing the pantograph raising weight and the difference weight, which can reduce the total configuration of the weights. In the scheme of the present invention, the detection of the contact force of the pantograph 1 is contactless, and it is only necessary to replace the weight that moves the traction pantograph 1 in the specified direction at the specified position as needed. Preferably, the mass of the first weight 2 is slightly greater than the maximum pantograph contact force limit value, the mass of the second weight 5 is slightly less than the minimum pantograph contact force limit value, and the third weight 13 is a lightweight weight for measuring the pantograph raising and lowering time, with a mass of 0.05kg to 0.1kg. It is hung on the pantograph head to measure the natural pantograph raising and lowering time of the pantograph within the allowable error range. Furthermore, the weights in the present invention are determined according to different models of pantographs, and the measurement results will not be difficult to guarantee due to the random direction and magnitude of the pulling force in traditional manual measurement.

[0044] like Figure 1 As shown, in order to more accurately obtain the rising and falling time of the third weight 13 during the measurement of the pantograph 1, as well as the rising and falling time and distance of the first weight 2 and the second weight 5, the data processing device 7 in the pantograph maintenance contact force measurement system of the present invention includes a control module and a positioning module, wherein the positioning module is used to obtain the position information of the first weight 2, the second weight 5 and the third weight 13 in real time when the first weight 2, the second weight 5 and the third weight 13 move, and send the position information to the control module. The control module comprehensively verifies the performance indicators of the pantograph static contact force and the action beat time according to the pantograph raising and lowering time, the pantograph bow head descending and rising acceleration curves, the pantograph bow head calculated mass and the mass of the lifting mass unit (16), and the actual maintenance limit caliber requirements, and makes a judgment according to the standard, and performs a comprehensive mining calculation to generate a work record sheet and a judgment result.

[0045] like Figure 3 As shown, in another embodiment of the present invention, the positioning module includes a coordinate measurement unit 8 and a timing unit 9, the coordinate measurement unit 8 is used to extract the starting and ending position information of the descent or ascent of the first weight 2, the second weight 5 and the third weight 13, so as to obtain the displacement of the first weight 2, the second weight 5 and the third weight 13; the timing unit 9 is used to measure the time for the first weight 2, the second weight 5 and the third weight 13 to descend or rise.

[0046] In another embodiment of the present invention, Figure 1As shown, the coordinate measurement unit 8 includes a magnetostrictive displacement sensor 4 arranged on one side of the pantograph, a first weight tag 3 arranged on the first weight 2, a second weight tag 6 arranged on the second weight 5, and a third weight tag 14 arranged on the third weight 13. The magnetostrictive displacement sensor 4 is used to measure the positions of the first weight tag 3, the second weight tag 6 and the third weight tag 14 in real time, and then determine the position coordinates of the first weight 2 or the second weight 5 and the third weight 13, and feed back the measured coordinate information to the control module in real time. According to the selection of the non-contact measurement method, a position coordinate recognition scheme of direct image recognition can also be adopted.

[0047] Generally speaking, the timing unit 9 is triggered by the coordinate measurement unit 8, and starts when the coordinate measurement unit 8 senses the movement of the first weight 2, the second weight 5 and the third weight 13, and ends the timing when the coordinate measurement unit 8 senses the stop of the movement of the first weight 2, the second weight 5 and the third weight 13. The timing unit 9 transmits the measured time information to the control module. According to the selection of the non-contact measurement method, a time coordinate recognition scheme of direct image recognition can also be adopted.

[0048] In another embodiment of the present invention, the first weight label 3 is in close contact with the first weight 2, the second weight label 6 is in close contact with the second weight 5, and the third weight label 14 is in close contact with the third weight 13. Preferably, the first weight label 3, the second weight label 6 and the third weight label 14 are lightweight radio frequency, two-dimensional code or other labels, which do not affect the quality of the weights and can accurately identify the position of the weights to improve the measurement accuracy and efficiency. The label stores the model information of the pantograph 1. When measuring time or force, the system synchronously identifies the pantograph model and other information on the weight label, and automatically associates the weight quality information in the background, and automatically matches the pantograph bow head calculated mass, pantograph card control limit and algorithm, without the need for operators to input any more information.

[0049] Preferably, the first weight tag 3 is fixedly connected to the first weight 2 by a first bolt, and the first bolt has a thread at one end extending into the first weight 2, and a smooth rod at the other end. In this way, the first weight tag 3 can be relatively displaced with the smooth rod under the action of external force, thereby increasing the recognition accuracy and efficiency of the coordinate measurement unit 8; the second weight tag 6 is fixedly connected to the second weight 5 by a second bolt, and the second bolt has a thread at one end extending into the second weight 5, and a smooth rod at the other end. In this way, the second weight tag 6 can be relatively displaced with the smooth rod under the action of external force, thereby increasing the recognition accuracy and efficiency of the coordinate measurement unit 8; the third weight tag 14 is fixedly connected to the third weight 13 by a third bolt, and the third bolt has a thread at one end extending into the third weight 13, and a smooth rod at the other end. In this way, the third weight tag 14 can be relatively displaced with the smooth rod under the action of external force, thereby increasing the recognition accuracy and efficiency of the coordinate measurement unit 8.

[0050] Preferably, the timing unit 9 includes three pressure sensors, one of which is arranged between the first weight 2 and the first weight tag 3, another is arranged between the second weight 5 and the second weight tag 6, and another is arranged between the third weight 13 and the third weight tag 14. That is, in the present invention, when the first weight 2 pulls the pantograph to move downward, a relative displacement is generated between the first weight 2 and the first weight tag 3, thereby squeezing the pressure sensor arranged between the first weight 2 and the first weight tag 3. The pressure sensor, that is, in the present invention, transmits the information of the pressure change detected by it over time to the control module, and the control module can obtain the pressure change between the first weight 2 and the first weight tag 3 and the time of the pressure change through the information, which is the time when the pantograph descends. Similarly, the displacement measurement of the second weight 5 and the third weight 13 is also triggered by the corresponding pressure sensor.

[0051] Preferably, the coordinate measuring unit 8 includes a laser measuring instrument or an image acquisition device. The laser measuring instrument can directly scan the position information of the first weight tag 3 or the second weight tag 6, and transmit the position information to the comprehensive calculation processing unit 11 through the communication unit 10. Alternatively, in the embodiment of the present invention, the position information of the first weight tag 3 or the second weight tag 6 can also be collected in real time through an image acquisition device such as a camera, a CCD camera, etc., and the position information is transmitted to the comprehensive calculation processing unit 11 through the communication unit 10.

[0052] Preferably, the present invention can also adopt a computer plus an interface unit, and a combination of several different weight combinations, without a mechanism on the weight and without an additional magnetostrictive sensor next to the pantograph, to form a pantograph contact force measurement method.

[0053] In another embodiment of the present invention, Figure 3 As shown, the control module includes a communication unit 10, a comprehensive calculation processing unit 11 and a display and output interface unit 12. The communication unit 10 realizes communication with the positioning module. The contactor calculation unit 11 is used to build a contact force model of the pantograph 1 according to the position information received by the communication unit 10 and the time information corresponding to each position information, the mass of the first weight 2, the second weight 5 and the third weight 13. According to the actual maintenance limit caliber requirements, the static contact force of the pantograph 1, the action cycle time and other performance indicators are comprehensively checked, and the same standard is judged, and a comprehensive mining calculation is performed to generate a work record sheet and a judgment result, and output it through the display and output interface unit 12.

[0054] Furthermore, if Figure 2 As shown, the specific structural diagram of the pantograph in the embodiment of the present invention includes a pantograph raising and lowering driving mechanism 104, a lower frame 103 connected to the pantograph raising and lowering mechanism 104, an upper frame 102 hinged to the lower frame 103, and a pantograph component (including a carbon slide plate) 101 connected to the upper frame 102. The carbon slide plate contacts the contact line to supply power to the high-speed EMU.

[0055] Furthermore, if Figure 4 As shown, the working process of the system of the present invention is as follows:

[0056] S1: Hang the third weight 13 on the pantograph head according to the model of the pantograph 1, and the data processing device 7 automatically identifies the model of the pantograph 1 through the third weight tag, and then identifies the corresponding EMU information, operates the pantograph, raises the pantograph, and measures the pantograph raising time t1, and lowers the pantograph, and measures the pantograph lowering time t2;

[0057] S2: After the pantograph is raised to the maximum working height, the pantograph is kept in the raised state. According to the model of the pantograph 1, a first weight 2 is hung on the pantograph head. The pantograph is lowered by the gravity of the first weight 2. The coordinate measurement unit 8 synchronously obtains the position information of the first weight 2 and the model information of the corresponding pantograph 1. The timing unit 9 synchronously obtains the time information of the first weight 2. The control module processes and displays the pantograph lowering height curve, the pantograph head speed curve and the pantograph head acceleration curve, such as Figure 6 As shown;

[0058] S3: When the first weight 2 stops descending, the first weight 2 is removed and the second weight 5 is hung on the pantograph 1. The pantograph rises slowly. The coordinate measurement unit 8 synchronously obtains the position information of the second weight 5 and the model information of the corresponding pantograph 1. The timing unit 9 synchronously obtains the time information of the second weight 5. The control module processes and displays the pantograph raising height curve, the pantograph head speed curve and the pantograph head acceleration curve, such as Figure 7 As shown;

[0059] S4: The control module calculates the pantograph static contact force, action beat time and other performance indicators according to the pantograph raising and lowering time, the pantograph head lowering and rising acceleration curves, the pantograph head calculated mass and the mass of the lifting mass unit 16, and the actual maintenance limit caliber requirements, and makes a judgment with the standard, and performs a comprehensive mining calculation to generate a work record sheet and judgment results, and outputs them through the display and output interface unit 12, such as Figure 5 shown.

[0060] In the embodiment of the present invention, since the weight is related to the vehicle model, the vehicle model can be identified by the weight, and the calculation processing unit can be shared. For different vehicles. Just select the weight of the corresponding vehicle model, automatically identify the model information of the corresponding pantograph through the weight label, and synchronize it with the data processing device 7. Compared with the existing motor-driven pantograph contact force measurement device, the information of the pantograph model can be automatically identified, reducing manual input, and different vehicle models share one data processing unit.

[0061] Preferably, the position information of the first weight 2 , the second weight 5 and the third weight 13 can also be measured by laser measurement or image restoration method, and the position information is transmitted to the comprehensive calculation processing unit 11 through the communication unit 10 .

[0062] In addition, the method of the present invention realizes the contact force measurement and average contact force measurement of pantograph raising and lowering by hanging weights of different masses, and processes and draws the pantograph raising and lowering height curves, pantograph bow head speed curves and pantograph bow head acceleration curves in real time through the control module, and calculates the parameters such as the pantograph raising contact force, pantograph lowering contact force, pantograph raising and lowering time, thereby realizing non-contact measurement, which not only has high measurement accuracy, but also automatically processes the measurement results, which is convenient and fast.

[0063] Furthermore, the measurement method of the present invention can perform measurements on multiple pantographs at the same time, and store the pantograph measurement parameters in the system server. Through the accumulation of a large amount of data, the data such as the pantograph raising contact force, pantograph lowering contact force, pantograph raising and lowering time, maximum pantograph raising height, minimum working height of different types of pantographs can be mined to predict pantograph failures, thereby preventing or replacing them in advance, and further ensuring the operation quality of the EMU.

[0064] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pantograph operation and maintenance contact force measurement system, characterized in that: include: A lifting mass unit (16) for hanging on the bow head of the pantograph (1); A data processing device (7) disposed within the field of view of the lifting mass unit (16), the data processing device (7) comprising a positioning module, the positioning module comprising a coordinate measurement unit (8) and a timing unit (9) for synchronously measuring time information of the lifting mass unit, the coordinate measurement unit (8) comprising a magnetostrictive displacement sensor (4) for measuring position information of the lifting mass unit; The data processing device (7) comprises a control module which is communicatively connected to the positioning module, the control module comprising a communication unit (10), a comprehensive calculation processing unit (11) and a display and output interface unit (12), the position information and time information of the lifting mass unit are communicated between the communication unit (10) and the comprehensive calculation processing unit (11), the comprehensive calculation processing unit (11) is used to process the position information and time information of the lifting mass unit, comprehensively calculate the pantograph lowering contact force curve, the pantograph raising contact force curve, the average contact force curve, and the pantograph raising time information, perform standard judgment on the pantograph raising contact force and time, and at the same time, combine the pantograph raising action rhythm and the history measurement characteristics to comprehensively compare and analyze the pantograph situation The condition is displayed through the display and output interface unit (12) and interconnected with the information system of the operation and maintenance unit; the lifting mass unit comprises a first weight (2), a second weight (5) and a third weight (13), and the masses of the first weight (2), the second weight (5) and the third weight (13) can be selected according to the type of each EMU, the type of the pantograph (1) and the maintenance limit, or the pantograph lowering weight of the same type of EMU can also be configured by adopting the scheme of superimposing the pantograph raising weight and the difference weight; the coordinate measurement unit (8) comprises a first weight label (3) provided on the first weight (2), a second weight label (6) provided on the second weight (5), and a third weight label (14) provided on the third weight (13); The mass of the first weight (2) is greater than the maximum pantograph lowering contact force limit value; The mass of the second weight (5) is less than the minimum pantograph lifting contact force limit value; The third weight (13) is a lightweight weight for measuring the bow raising and lowering time, and its mass is 0.05kg to 0.1kg.

2. A pantograph operation and maintenance contact force measurement system according to claim 1, characterized in that: The first weight tag (3), the second weight tag (6) and the third weight tag (14) are radio frequency, two-dimensional code or other tags that can be used for non-contact positioning technology identification, and the tags are all marked with information that can identify the model of the pantograph (1).

3. A pantograph operation and maintenance contact force measurement system according to claim 1, characterized in that: The first weight tag (3), the second weight tag (6) and the third weight tag (14) are movable magnetic rings.

4. A pantograph operation and maintenance contact force measurement system according to any one of claims 1 to 3, characterized in that: The timing unit (9) comprises three pressure sensors, one is arranged between the first weight (2) and the first weight tag (3), one is arranged between the second weight (5) and the second weight tag (6), and one is arranged between the third weight (13) and the third weight tag (14).

5. A method for measuring contact force during pantograph operation and maintenance, characterized in that: The system according to any one of claims 1 to 4 is implemented, comprising the following steps: S1: hanging a third weight (13) on the pantograph head according to the model of the pantograph (1), the data processing device (7) automatically identifying the pantograph model information through the third weight tag (14), operating the pantograph, raising the pantograph and measuring the pantograph raising time t1, lowering the pantograph and measuring the pantograph lowering time t2; S2: After the pantograph is raised to the maximum working height, the pantograph is kept in the raised state, and a first weight (2) is suspended on the pantograph head according to the model of the pantograph (1), and the pantograph is lowered by the gravity of the first weight (2), and the coordinate measurement unit (8) synchronously obtains the position information of the first weight (2), and the timing unit (9) synchronously obtains the time information of the first weight (2), and the control module processes and displays the pantograph lowering height curve, the pantograph head speed curve, and the pantograph head acceleration curve; S3: When the first weight (2) stops descending, the first weight (2) is removed and a second weight (5) is hung on the bow head of the pantograph (1), the pantograph slowly rises, the coordinate measurement unit (8) synchronously obtains the position information of the second weight (5), the timing unit (9) synchronously obtains the time information of the second weight (5), and the control module processes and displays the pantograph raising height curve, the pantograph bow head speed curve and the pantograph bow head acceleration curve; S4: The control module comprehensively verifies the performance indicators of the pantograph static contact force and action rhythm time according to the pantograph raising and lowering time, the pantograph bow head descending and ascending acceleration curves, the pantograph bow head calculated mass and the mass of the lifting and lowering mass unit (16), and the actual maintenance limit caliber requirements, and makes a judgment according to the standards, and performs comprehensive mining calculations to generate an operation record sheet and judgment results, which are output through the display and output interface unit (12) and interconnected with the information system of the operating maintenance unit.

6. A pantograph operation and maintenance contact force measurement method according to claim 5, characterized in that: In S2 and S3, the position information of the first weight (2), the second weight (5) and the third weight (13) is obtained by laser measurement or image restoration method, and the position information is transmitted to the comprehensive calculation processing unit (11) through the communication unit (10).

7. A pantograph operation and maintenance contact force measurement method according to claim 6, characterized in that: The mass of the first weight (2) is greater than the maximum pantograph lowering contact force limit value; The mass of the second weight (5) is less than the minimum pantograph lifting contact force limit value; The third weight (13) is a lightweight weight for measuring the bow raising and lowering time, and its mass is 0.05kg to 0.1kg.

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