Professional loop signal-to-noise ratio testing tool

Abstract

The utility model provides a loop line signal-to-noise ratio professional test tool comprising a vehicle frame, a vehicle-mounted ATC antenna and a spectrum analyzer are installed on the vehicle frame, one side of the vehicle-mounted ATC antenna is fixedly connected with an antenna joint, one end of the spectrum analyzer is fixedly connected with a connection interface, and the other end of the spectrum analyzer is fixedly connected with a power supply. A transmission cable is electrically connected between the antenna connector and the connection interface. According to the utility model, through the antenna joint, the connection interface and the transmission cable, the vehicle-mounted ATC antenna is directly connected with the spectrum analyzer, a vehicle-mounted equipment interface is thrown away, and the measurement of a loop signal value and a noise value can be realized by manually pushing a trolley, so that the measurement is simple and effective.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-to-ground signal transmission in rail transit signaling systems, specifically a professional testing tool for loop signal-to-noise ratio. Background Technology

[0002] The loop signal-to-noise ratio (SNR) is a crucial parameter for measuring signal quality in a Thales loop system. It represents the relative strength between the signal and background noise and can be measured near the loop within the interval. A substandard loop SNR can easily lead to poor train-to-ground communication, message corruption, and even VOBC (Voice over Circulation) communication loss for the train.

[0003] However, the existing signal-to-noise ratio (SNR) testing methods for loop lines have many inconveniences. First, the testing cost is high, requiring the use of EMU (Electric Multiple Unit) testing points, which necessitates cooperation from the dispatch center, vehicle center, and passenger transport center. Second, there are many regional restrictions; in complex areas such as some storage lines, EMU testing is slow. Third, the operation is complex; during testing, trains need to actively switch and cut off sections, and block sections need to be set up. Signal value testing requires establishing communication and unblocking sections, resulting in a slow overall testing process. In addition, each time a loop line fault is repaired, testing must be conducted at night using EMU testing points to ensure normal operation the next day. This requires repeated switching between testing with electric vehicles and testing in power-out sections, occupying EMU testing points, increasing the risk of electric shock to personnel, and significantly impacting the efficiency of fault diagnosis. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a professional test tool for loop signal-to-noise ratio. It uses a handcart to simulate a train, with the antenna and other components fixed on the handcart. The test is conducted by manually pushing the handcart, which is simple, convenient, and highly practical.

[0005] The technical solution provided by this utility model is as follows: a professional test tool for loop signal-to-noise ratio, including a vehicle frame, on which a vehicle-mounted ATC antenna and a spectrum analyzer are mounted. An antenna connector is fixedly connected to one side of the vehicle-mounted ATC antenna, and a connection interface is fixedly connected to one end of the spectrum analyzer. A transmission cable is electrically connected between the antenna connector and the connection interface.

[0006] Furthermore, support plates are fixedly connected to the four corners of the lower end face of the frame, and rollers are rotatably connected to the lower end face of the support plates. Limiting wheels are connected to the outer wall of the rollers.

[0007] Furthermore, the limiting wheel is located on the side of the roller near the center of the frame, and the diameter of the limiting wheel is larger than the diameter of the roller.

[0008] Furthermore, a second crossbeam and a mounting plate are fixedly connected to both sides of the middle part of the vehicle frame, and a mounting frame is rotatably connected to the second crossbeam via hinges. The vehicle-mounted ATC antenna is fixedly installed on one side of the mounting plate, and the spectrum analyzer is movably installed inside the mounting frame.

[0009] Furthermore, a mounting plate is fixedly connected to one side of the vehicle-mounted ATC antenna, and mounting screws are fixedly connected to one side of the mounting plate near the four corners. The mounting screws pass through the horizontal plate of the mounting plate and are threaded with nuts.

[0010] Furthermore, a crossbeam is fixedly connected to the frame, a fixing pin is fixedly connected to the outer wall of the crossbeam, a locking rod is rotatably connected to the outer wall of the fixing pin, a positioning rod is fixedly connected to the inner wall of the frame, and the other end of the locking rod is movably sleeved with the positioning rod.

[0011] Furthermore, a handrail is connected to the upper end face of the frame near the rear side, and the lower ends of the two bars of the handrail are fixedly connected to mounting parts by bolts, and the lower end face of the mounting parts is fixedly connected to the frame.

[0012] Furthermore, a limiting rod is movably connected between the two mounting components, and both ends of the limiting rod pass through the two mounting components and are threaded with nuts.

[0013] Furthermore, a display screen is fixedly installed on one side of the surface of the spectrum analyzer, and control buttons are fixedly installed on the other side of the surface of the spectrum analyzer.

[0014] This utility model has the following beneficial effects:

[0015] 1. Compared with existing technologies, this professional loop signal-to-noise ratio testing tool is convenient to measure, reduces the number of operators, and saves time and maintenance costs in the entire test, thereby improving on-site work efficiency.

[0016] 2. Compared with existing technologies, this professional signal-to-noise ratio testing tool for loop lines can perform signal-to-noise ratio testing even during power outages without the need to apply for train operation permits, thus achieving the goal of energy conservation and consumption reduction.

[0017] 3. Compared with existing technologies, this professional loop signal-to-noise ratio testing tool eliminates the need to repeatedly switch between power outage investigation and electric vehicle verification when handling loop faults and investigating potential hazards, thus ensuring the safety and efficiency of fault handling. Attached Figure Description

[0018] Figure 1 and Figure 2 These are structural schematic diagrams of this utility model from different angles;

[0019] Figure 3 This is a bottom view of the structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the vehicle-mounted ATC antenna of this utility model.

[0021] In the diagram: 1. Frame; 101. Crossbeam 1; 102. Crossbeam 2; 103. Support plate; 104. Roller; 105. Limiting wheel; 106. Mounting plate; 107. Frame assembly; 108. Fixing pin; 109. Clamping rod; 110. Positioning rod; 2. Vehicle-mounted ATC antenna; 201. Antenna connector; 202. Fixing plate; 203. Mounting screw; 3. Spectrum analyzer; 301. Display screen; 302. Control buttons; 303. Connection interface; 4. Handrail; 401. Mounting component; 402. Limiting rod; 5. Transmission cable. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Reference Figure 1-4This utility model provides a professional testing tool for loop signal-to-noise ratio (SNR), including a frame 1, a vehicle-mounted ATC antenna 2, a spectrum analyzer 3, and a handrail 4. Support plates 103 are fixedly connected to the four corners of the lower end face of the frame 1. Rollers 104 are rotatably connected to the lower end face of the support plates 103. Limiting wheels 105 are connected to the outer wall of the rollers 104. A second crossbeam 102 and a mounting plate 106 are fixedly connected to both sides of the middle section of the frame 1, respectively. A mounting frame 107 is rotatably connected to the second crossbeam 102 via hinges. The vehicle-mounted ATC antenna 2 is fixedly mounted on one side of the mounting plate 106. The spectrum analyzer 3 is movably installed within the frame 107. An antenna connector 201 is fixedly connected to one side of the vehicle-mounted ATC antenna 2, and a connection interface 303 is fixedly connected to one end of the spectrum analyzer 3. A transmission cable 5 is electrically connected between the antenna connector 201 and the connection interface 303. The transmission cable 5 is fixed to the vehicle frame 1 by straps. The transmission cable 5 is made of 36KHz cable, and the frequency of the vehicle-mounted ATC antenna 2 is also 36KHz, which facilitates direct connection and avoids the drawback of existing antennas requiring conversion through the vehicle interface before they can be recognized by the oscilloscope.

[0026] With the onboard ATC antenna 2, antenna connector 201, spectrum analyzer 3, connection interface 303 and transmission cable 5, the loop signal-to-noise ratio test can be performed manually at the sunroof signal equipment maintenance work point. The tester only needs to install and adjust the equipment in advance, adjust the height of the ATC antenna, and manually push the vehicle frame 1 to move the test. It is simple, convenient and more practical.

[0027] The limiting wheel 105 is located on the side of the roller 104 near the center of the frame 1, and the diameter of the limiting wheel 105 is larger than the diameter of the roller 104. The frame 1 is mounted on the track, and the frame 1 is moved by the roller 104. The limiting wheel 105 is used to fit against the inner wall of the track to limit the movement and prevent the frame 1 from falling.

[0028] A mounting plate 202 is fixedly connected to one side of the vehicle-mounted ATC antenna 2. Mounting screws 203 are fixedly connected to the four corners of one side of the mounting plate 202. The mounting screws 203 pass through the horizontal plate of the mounting plate 106 and are threaded with nuts. The vehicle-mounted ATC antenna 2 is fixedly installed on the mounting plate 106 in this way.

[0029] A handrail 4 is connected to the upper end face of the frame 1 near the rear. The lower ends of the two poles of the handrail 4 are fixedly connected to the mounting parts 401 by bolts. The lower end face of the mounting parts 401 is fixedly connected to the frame 1. The mounting parts 401 are welded to the frame 1 and the handrail 4 is installed through the mounting parts 401.

[0030] A limiting rod 402 is movably connected between the two mounting parts 401. The two ends of the limiting rod 402 pass through the two mounting parts 401 respectively and are threaded with nuts. The limiting rod 402 can press against the outer walls of the two poles of the handrail 4 to limit its movement and prevent the limiting rod 402 from rotating.

[0031] A crossbeam 101 is fixedly connected to the frame 1. A fixing pin 108 is fixedly connected to the outer wall of the crossbeam 101. A locking rod 109 is rotatably connected to the outer wall of the fixing pin 108. A positioning rod 110 is fixedly connected to the inner wall of the mounting frame 107. The other end of the locking rod 109 is movably sleeved on the positioning rod 110. After the mounting frame 107 is rotated and lifted relative to the crossbeam 102, the locking rod 109 can be rotated. The metal ring at the upper end of the locking rod 109 is sleeved on the outer wall of the positioning rod 110 to support the mounting frame 107, which facilitates the rotation and lifting of the spectrum analyzer 3 for operation and observation.

[0032] A display screen 301 is fixedly installed on one side of the surface of the spectrum analyzer 3, and a control button 302 is fixedly installed on the other side of the surface of the spectrum analyzer 3. The control button 302 is used for operation, and the display screen 301 is used to display data.

[0033] Working principle: By bypassing the connection port of the vehicle-mounted equipment through the antenna connector 201, the connection interface 303 and the transmission cable 5 for electrical connection between the two, the vehicle-mounted ATC antenna 2 and the spectrum analyzer 3 can be directly connected. Then, using the hand-push frame 1 structure to simulate a train, the specially made vehicle-mounted ATC antenna 2 is fixed on the frame 1 according to the equipment installation standard. Then, the frame 1 is manually pushed to move, so that the loop signal value and noise value can be measured. It is simple and effective.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A loop SNR professional test tool characterized by, Including frame (1), frame (1) is installed with vehicle ATC antenna (2) and spectrum analyzer (3), one side of vehicle ATC antenna (2) is fixedly connected with antenna connector (201), one end of spectrum analyzer (3) is fixedly connected with connecting interface (303), transmission cable (5) is electrically connected between antenna connector (201) and connecting interface (303).

2. The loop SNR professional test tool of claim 1, wherein, The lower end surface of the frame (1) is fixedly connected with the support plate (103) at the four corners, and the lower end surface of the support plate (103) is rotatably connected with the roller (104), and the outer wall of the roller (104) is connected with the limiting wheel (105).

3. The loop SNR professional test tool of claim 2, wherein, The limiting wheel (105) is arranged at the center side of the roller (104) close to the frame (1), and the diameter of the limiting wheel (105) is greater than the diameter of the roller (104).

4. The loop SNR professional test tool of claim 1, wherein, The middle part of the frame (1) is fixedly connected with the second cross beam (102) and the mounting plate (106) on both sides, respectively, the second cross beam (102) is rotatably connected with the frame (107) through the hinge, the vehicle ATC antenna (2) is fixedly arranged on one side of the mounting plate (106), and the spectrum analyzer (3) is movably mounted in the frame (107).

5. The loop SNR professional test tool of claim 4, wherein, One side of the vehicle ATC antenna (2) is fixedly connected with the fixed plate (202), and the fixed plate (202) is fixedly connected with the mounting screw (203) near the four corners on one side, the mounting screw (203) penetrates the horizontal plate of the mounting plate (106) and is screwedly connected with the nut.

6. The loop SNR professional test tool of claim 4, wherein, The frame (1) is fixedly connected with the first cross beam (101), the outer wall of the first cross beam (101) is fixedly connected with the fixed pin (108), the outer wall of the fixed pin (108) is rotatably connected with the clamping rod (109), the inner wall of the frame (107) is fixedly connected with the positioning rod (110), and the other end of the clamping rod (109) movably sleeves the positioning rod (110).

7. The loop SNR professional test tool of claim 1, wherein, The upper end surface of the frame (1) is connected with the handrail (4) near the rear side, the lower end of the two rod bodies of the handrail (4) is fixedly connected with the mounting piece (401) through the bolt, and the lower end surface of the mounting piece (401) is fixedly connected on the frame (1).

8. The loop SNR professional test tool of claim 7, wherein: The limiting rod (402) is movably connected between the two mounting pieces (401), and the two ends of the limiting rod (402) penetrate the two mounting pieces (401) and are screwedly connected with the nuts.

9. The loop SNR professional test tool of claim 1, wherein, The surface of the spectrum analyzer (3) is fixedly provided with a display screen (301), and the other surface of the spectrum analyzer (3) is fixedly provided with a control button (302).

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