Rigidity measuring device for rigid contact network and application method of rigidity measuring device

Abstract

The invention relates to the technical field of electrified railway contact net construction, and provides a rigidity measuring device and method for a rigid contact net in order to solve the problem that rigidity measuring of the rigid contact net lacks a special device. The device comprises a measuring mechanism, a supporting and loading mechanism and an auxiliary device. The tension and pressure sensor is fixed to the upper connecting base, the displacement measuring instrument is connected with the supporting foot stool, and all the parts work cooperatively. The measuring method comprises the following steps: firstly, starting and selecting a range to record an initial value of the tension and pressure sensor, moving the sensor to a measuring point by using a ladder truck to abut against a contact line, adjusting the range of the displacement measuring instrument, applying force by the force applying device through the adjusting screw rod, reading a numerical value of the sensor, converting a load value, and simultaneously recording a displacement change value. And finally, the load value is divided by the displacement variation value to obtain the rigidity. The device fills the measurement blank, is simple in structure and easy and convenient to operate, can be assembled, measured and carried by a single person, improves the working efficiency, and is of great significance for guaranteeing safe and stable operation of a pantograph-catenary system.

Description

Technical Field

[0001] The invention relates to the technical field of electrified railway contact network construction, and in particular to a rigid contact network stiffness measuring device and an application method thereof. Background Art

[0002] In the process of electrified railway construction, the application of rigid suspension in the installation of contact network in tunnels is becoming more and more common. Because of its advantages such as strong electrical continuity, excellent wind resistance and small installation space, it occupies an important position in railway construction. However, when the pantograph system is in operation, the stability of the contact suspension stiffness has a key influence on the dynamic current collection quality. If the stiffness changes greatly and the rate of change is high, it will cause increased wear of the conductor and the slide plate, and greatly shorten the service life. In severe cases, it will also cause contact wire and pantograph ablation, posing serious hidden dangers to driving safety. At present, there is a lack of devices specifically used to measure the stiffness of rigid contact networks on the market, which makes it difficult to meet the urgent needs of engineering practice for stiffness measurement and subsequent adjustments.

[0003] Patent document CN201911099439.3 discloses an overhead rigid contact network rigid-flexible transition characteristic detection device, including a rail car arranged on a track, a support frame provided on the rail car, an articulated platform and a mounting frame provided on the support frame, a balance plate hinged on the articulated platform, a shaft sleeve fixed on the mounting frame, a sliding shaft that can move in a vertical direction is slidably arranged in the shaft sleeve, a contact slider in contact with a contact line clamped by a rigid-flexible transition is provided on the sliding shaft, a contact plate in contact with the balance plate is provided at the end of the sliding shaft opposite to the contact slider, a displacement sensor is also provided on the mounting frame, a sensor contact of the displacement sensor is in contact with the contact plate, and a loading platform with a loading weight is provided at the end of the balance plate opposite to the contact plate; the method effectively simulates the on-site situation to perform real-time detection of the rigid-flexible transition characteristics, but the method has high manual operation cost and low efficiency, and cannot accurately simulate the contact state during the operation of the train, resulting in unreliable detection results.

[0004] Patent document CN201721735071.1 discloses a rigid contact network bow-net contact pressure detection device, wherein the wire in the rigid contact network is clamped by a busbar, and the busbar is suspended and supported by a number of fixed brackets; the bow-net contact pressure detection device includes a data acquisition console and a laser displacement sensor arranged at a non-fixed bracket above the busbar; the intersection point of the laser emitted by the laser displacement sensor and the upper surface of the busbar is the monitoring point, and the data acquisition console is electrically connected to the data output end of the laser displacement sensor to receive measurement data in real time. However, the device can only check the contact pressure, and cannot measure the stiffness. Summary of the invention

[0005] In the existing technology, the rigid contact network has high stiffness and the deformation is inconvenient to measure. The physical quantity needs to be converted into a form that is easy to read. At the same time, the stiffness measurement requires high-altitude operation, which is affected by the tunnel clearance. The number of operators and operating space need to be reduced as much as possible.

[0006] In response to the demand for rigid contact network stiffness measurement, the present invention provides a stiffness measurement device and method applied to a rigid contact network. Through the cooperation of a measuring mechanism, a supporting mechanism and an auxiliary device, a single worker can use a ladder truck to efficiently complete the measurement of the rigid suspended contact network stiffness.

[0007] In order to achieve the above object, the present invention provides a rigid contact network stiffness measuring device, which comprises:

[0008] A measuring mechanism, comprising a tension and pressure sensor, a tension and pressure display device and a displacement measuring instrument;

[0009] A supporting loading mechanism includes an upper connecting base, a lower connecting base, a supporting tripod and a force adding device;

[0010] Auxiliary devices, including a power supply system and corresponding connecting wires, used to supply power to the tension and pressure display device and the displacement measuring instrument;

[0011] The tension and pressure sensor is fixed on the upper connecting base, the tension and pressure sensor is communicatively connected with the tension and pressure display device, and the measurement data of the tension and pressure sensor is transmitted to the tension and pressure display device. The displacement measuring instrument is connected with the supporting tripod to ensure that the displacement measuring instrument can stably obtain relevant displacement information during the measurement process; the upper connecting base is respectively connected with the tension and pressure sensor and the force applying device, and the lower connecting base is respectively connected with the force applying device and the supporting tripod to provide a solid supporting foundation for the entire device during the force application process.

[0012] Furthermore, the support tripod is composed of a plurality of brackets, each bracket is connected by bolts, and the height of the support tripod can be adjusted according to the site conditions.

[0013] Furthermore, the force-adding device can be slowly lifted and lowered by adjusting the screw rod, thereby achieving force loading and unloading.

[0014] Furthermore, the displacement measuring instrument is stably connected to the pan / tilt fixture of the supporting tripod in a detachable manner.

[0015] Furthermore, the tension and pressure sensor is connected to the upper connecting base via threads.

[0016] The present invention also provides a method for measuring the rigid contact network stiffness using the above device, which is characterized by comprising the following steps:

[0017] S1, confirm that the tension and pressure display device is turned on and select the appropriate range, and record the initial display value;

[0018] S2, use a ladder truck to move the tension and pressure sensor to the bottom of the measuring point and place it against the bottom contact line of the rigid contact network;

[0019] S3, adjust the displacement measuring instrument to within the measuring range;

[0020] S4, slowly applying external force by adjusting the screw to control the force-adding device, while reading the value of the tension and pressure sensor, and recording the corresponding displacement change through the displacement measuring instrument;

[0021] S5, calculate the stiffness of the rigid suspension contact network at that location based on the measured load value and displacement change value.

[0022] Furthermore, in step S5, the load value in a single measurement is divided by the displacement change value to obtain the stiffness of the rigid suspension contact network measurement point.

[0023] Furthermore, the load value is the value of the tension pressure sensor after the pressure is applied minus its initial display value.

[0024] Furthermore, during the entire measurement process, the displacement measuring instrument must use a stable and reliable support or fixed platform as a loading support during measurement, so as to ensure that the displacement measuring instrument will not produce measurement errors due to unstable support during the measurement process, thereby ensuring the accuracy and reliability of the displacement measurement data.

[0025] The beneficial effects of this application are:

[0026] 1. The innovative use of the combination of tension and pressure sensors and displacement measuring instruments has achieved accurate measurement of the rigid contact network stiffness. Previously, there was a lack of specialized measurement methods in this field. This invention fills the gap in the measurement of rigid suspension contact network stiffness and provides a key technical solution for the industry;

[0027] 2. The overall structure of the device is simple, and the connection method of each component is simple and stable. Through the measuring mechanism, the deformation and force at the measuring point of the rigid contact network can be measured, and then the stiffness value can be accurately solved; through the supporting loading mechanism, the stable operation of the measuring device and the slow loading of the force can be achieved; through the auxiliary device, it can be operated independently of the power line and is convenient for carrying and transportation. The entire device has a reliable structure and high precision, which can effectively improve labor efficiency and reduce the labor intensity of workers. One person can complete the entire process from assembly, measurement to handling of the measuring device, which greatly improves work efficiency and effectively reduces manpower and time costs. It has strong practicality in actual engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Attached Figure 1 It is a rigid contact network stiffness measuring device in the present invention;

[0030] Attached Figure 2 Schematic diagram of the rigid contact network stiffness measurement method.

[0031] In the figure: 1. Mobile phone mounting position; 2. Upper connecting base; 3. Force-applying device; 4. Lower connecting base; 5. Adjusting screw; 6. Quick-release plate; 7. Displacement measuring instrument; 8. Support tripod; 9. Power supply system; 10. Tension and pressure display device. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0034] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0035] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0037] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation of the present invention will be described below with reference to the accompanying drawings.

[0039] In this embodiment, the attached Figure 1 The rigid contact network stiffness measuring device displayed mainly includes three core parts in its overall structure: measuring mechanism, supporting loading mechanism and auxiliary device.

[0040] As an important component for obtaining key data, the measuring mechanism includes a tension and pressure sensor 1, a tension and pressure display device 10 and a displacement measuring instrument 7. Among them, a highly reliable and efficient communication connection link is established between the tension and pressure sensor 1 and the tension and pressure display device 10. During the measurement process, once the tension and pressure sensor 1 senses the change of the force applied to the rigid contact network by the outside world, it will quickly and accurately transmit the acquired analog or digital signal to the tension and pressure display device 10 according to the pre-set communication protocol and high-precision data transmission standard.

[0041] This communication connection adopts advanced specific communication technology, such as wireless Bluetooth low-power technology or wired high-speed serial communication technology, etc., to ensure the integrity and stability of data during transmission, effectively avoid signal interference and data loss. In this embodiment, wired high-speed serial communication technology is used to ensure the accuracy of data. The tension and pressure display device 10, relying on its internal precise signal processing module and intelligent algorithm, can parse, convert and optimize the received data in a very short time, and then present the measured data to the operator in an intuitive and clear form in real time, so that the operator can timely and accurately grasp the dynamic changes of the tension and pressure of the rigid contact network, and provide a solid data foundation for subsequent analysis, judgment and decision-making, which effectively guarantees the efficiency and accuracy of the entire stiffness measurement work. The tension and pressure sensor 1 is firmly mounted on the upper connection base 2, which plays a key role in the conversion process between mechanical force and electrical signal, and has a wide range of applications in many fields such as industry and scientific research. Within the selection range of this embodiment, the tension and pressure sensor can be selected from at least one of strain gauge type, piezoelectric type, capacitive type, piezoresistive type and other types. It is worth mentioning that the piezoresistive tension and pressure sensor has a unique working principle - using the piezoresistive effect of semiconductor materials, when external force acts on the semiconductor sensitive element, the resistance value of the sensitive element will change accordingly, and then the resistance change will be converted into a measurable electrical signal through a special circuit, thereby realizing accurate force measurement. This sensor has become the first choice for this embodiment due to its significant advantages such as high sensitivity and easy miniaturization.

[0042] The displacement measuring instrument 7 is responsible for the important mission of measuring the displacement of the object. In this embodiment, it can use at least one of a laser displacement sensor, a grating displacement sensor, a capacitive displacement sensor or an inductive displacement sensor. In terms of installation, the displacement measuring instrument 7 is mainly connected closely to the pan / tilt fixture of the support tripod 8 through the "quick release plate" 6. Of course, other reliable methods can also be used to stably install it on the support according to actual conditions to ensure that the displacement data can be accurately obtained during the measurement process.

[0043] The supporting loading mechanism is mainly composed of an upper connecting base 2, a force device 3, a lower connecting base 4 and a supporting tripod 8. One end of the upper connecting base 2 is tightly connected to the tension and pressure sensor 1 through a thread, and the other end is firmly connected to the force device 3 by means of bolts; the lower connecting base 4 is also bolted to the force device 3 at one end, and bolted to the supporting tripod 8 at the other end. The supporting tripod 8 is composed of a plurality of brackets, each of which is reliably connected by bolts, and its height is adjustable and can be flexibly determined according to the actual situation on site to meet the needs of different measurement environments. The force device 3 can achieve slow and precise lifting and lowering operations by adjusting the screw 5, thereby effectively completing the force loading and unloading process, ensuring that the force application during the measurement process is stable and controllable.

[0044] The auxiliary device mainly includes a power supply system 9 and corresponding connecting lines, and its core function is to provide stable power support for the tension and pressure display device 10 and the displacement measuring instrument 7. The power supply system is diverse in type, and can be either an AC power supply or a DC power supply, or a chemical power supply. In the selection of chemical power sources, lithium batteries, capacitors, photovoltaic cells, etc. are all relatively ideal options. Among them, lithium batteries can be used as one of the preferred chemical power sources in this embodiment due to their advantages such as high energy density and long cycle life, providing strong guarantee for the continuous and stable operation of the entire measuring device.

[0045] The present invention can measure the deformation and force at the measuring point of the rigid contact network through the measuring mechanism, and then accurately solve the stiffness value; through the supporting loading mechanism, the stable operation of the measuring device and the slow loading of the force can be achieved; through the auxiliary device, it can achieve operation without relying on the power line and is convenient for carrying and transportation. The entire device has a reliable structure and high accuracy, which can effectively improve labor efficiency and reduce the labor intensity of workers.

[0046] Attached Figure 2 The following is a schematic diagram of the rigid contact network stiffness measurement method. The steps of the rigid contact network stiffness measurement method are as follows:

[0047] Before measuring the rigid contact network stiffness, first ensure that the tension and pressure display device is turned on, and carefully select the appropriate range based on past experience, engineering estimate data or relevant standards and specifications. This operation is crucial. The appropriate range can ensure the accuracy and reliability of the measured data and avoid measurement errors caused by too large or too small a range. After selecting the range, immediately record the initial display value of the pressure sensor. This value will serve as the key benchmark data for the subsequent calculation of the applied load value, providing an important starting reference for the entire measurement process;

[0048] Then, operate the ladder car to drive smoothly to the bottom of the predetermined rigid contact network measurement point. After the ladder car is in place, carefully place the tension and pressure sensor 1 on the force device 3, and carefully adjust its position so that the tension and pressure sensor 1 can be tightly and firmly against the area near the bottom contact line of the rigid contact network.

[0049] For displacement measuring instruments, they must be equipped with stable and reliable supports or fixed platforms as loading support structures during measurement. During installation, the displacement measuring instrument must be finely adjusted to ensure that its measurement range can fully cover the possible displacement changes that may occur during this measurement. This requires operators to have an in-depth understanding of the performance parameters of the measuring instrument and make reasonable adjustments based on the actual situation on site to ensure the accuracy and effectiveness of displacement measurement.

[0050] After confirming that the power supply system is in normal working condition, place the tension and pressure sensor 1 at an appropriate position near the test object. Then, the force device 3 is precisely controlled by rotating the adjusting screw to slowly and steadily load the sensor with external force. During the loading process, pay close attention to the changes in the value on the tension and pressure display device. When the load reaches the predetermined level or meets the measurement requirements, read the value in the tension and pressure display device at this time. Subsequently, the read value is subtracted from the initial display value recorded previously, and then the difference is accurately converted into the actual applied load value based on the calibration parameters and conversion formula of the tension and pressure display device. At the same time, the displacement measuring instrument 7 is used to synchronously perform the measurement operation, and the displacement change value generated by the rigid contact network at this time is recorded in detail.

[0051] Finally, according to the basic principle of stiffness calculation, the load value obtained from a single measurement is divided by the corresponding displacement change value. The result obtained through this calculation process is the stiffness value of the rigid suspension contact network at the measurement point. This value can intuitively reflect the mechanical performance characteristics of the rigid contact network at the measurement point, providing key data support for subsequent engineering analysis, evaluation and necessary adjustments.

[0052] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A rigid contact network stiffness measuring device, characterized in that: include: A measuring mechanism, comprising a tension and pressure sensor, a tension and pressure display device and a displacement measuring instrument; A supporting loading mechanism includes an upper connecting base, a lower connecting base, a supporting tripod and a force adding device; Auxiliary devices, including a power supply system and corresponding connecting wires, used to supply power to the tension and pressure display device and the displacement measuring instrument; The tension and pressure sensor is fixed on the upper connecting base, the tension and pressure sensor is communicatively connected with the tension and pressure display device, and the measurement data of the tension and pressure sensor is transmitted to the tension and pressure display device. The displacement measuring instrument is connected with the supporting tripod to ensure that the displacement measuring instrument can stably obtain relevant displacement information during the measurement process; the upper connecting base is respectively connected with the tension and pressure sensor and the force applying device, and the lower connecting base is respectively connected with the force applying device and the supporting tripod to provide a solid supporting foundation for the entire device during the force application process.

2. The rigid contact network stiffness measuring device according to claim 1, characterized in that: The support bracket is composed of a plurality of brackets, each bracket is connected by bolts, and the height of the support bracket can be adjusted according to the on-site conditions.

3. The rigid contact network stiffness measuring device according to claim 1, characterized in that: The force adding device is slowly lifted and lowered by adjusting the screw rod, thereby realizing the loading and unloading of force.

4. The rigid contact network stiffness measuring device according to claim 1, characterized in that: The displacement measuring instrument is stably connected to the pan / tilt fixture of the supporting tripod in a detachable manner.

5. The rigid contact network stiffness measuring device according to claim 1, characterized in that: The tension and pressure sensor is connected to the upper connection base via threads.

6. A method for measuring rigid contact network stiffness using the device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, confirm that the tension and pressure display device is turned on and select the appropriate range, and record the initial display value; S2, use a ladder truck to move the tension and pressure sensor to the bottom of the measuring point and place it against the bottom contact line of the rigid contact network; S3, adjust the displacement measuring instrument to within the measuring range; S4, slowly applying external force by adjusting the screw to control the force-adding device, while reading the value of the tension and pressure sensor, and recording the corresponding displacement change through the displacement measuring instrument; S5, calculate the stiffness of the rigid suspension contact network at that location based on the measured load value and displacement change value.

7. The method according to claim 6, characterized in that In step S5, the load value in a single measurement is divided by the displacement change value, which is the stiffness of the rigid suspension contact network measurement point at that location.

8. The method according to claim 6, characterized in that The load value is the value of the pull pressure sensor after applying pressure minus its initial display value.

9. The method according to claim 6, characterized in that During the entire measurement process, the displacement measuring instrument must use a stable and reliable support or fixed platform as a loading support during measurement, so as to ensure that the displacement measuring instrument will not produce measurement errors due to unstable support during the measurement process, thereby ensuring the accuracy and reliability of the displacement measurement data.

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