Bushing looseness detection method for bogie frame

Abstract

The invention discloses a bushing looseness detection method for a bogie frame. The detection method comprises the steps that S1, a detection assembly is moved to the position, where a bushing needs to be detected, of the frame; s2, the installation assembly penetrates through the bush installation part on the framework; s3, manually rotating the operation handle to enable the grooved wheel disc to rotate under the action of the operation rod, manually adjusting the operation rod to enable the first boss on the detection head to penetrate through the bushing on the framework and enable the second boss on the detection head not to penetrate through the bushing and to be in contact with the edge of the bushing, and ensuring that the second boss on the detection head is in contact with the edge of the bushing; s4, the oil cylinder body and the framework are fixed into a whole under the action of the mounting assembly; s5, the piston rod of the oil cylinder drives the detection mechanism to move, a pressure display screen of the pressure sensor is observed at the same time till the display number of the pressure display screen is within the set range, and then the display number of the displacement sensor display screen of the oil cylinder piston rod is checked. The operation of an operator is facilitated, so that the use convenience is improved.

Description

Technical Field

[0001] This application belongs to the field of rail transit technology, and in particular relates to a method for detecting loose bushings in bogie frames. Background Technology

[0002] Rail transit plays a vital role in my country's long-distance, high-capacity transportation. In particular, with the construction of high-speed rail, people's travel has become much more convenient, and taking high-speed rail has become the preferred mode of transportation. With the increase in car ownership, cities are becoming increasingly congested, especially during rush hour. In order to alleviate traffic pressure, more and more cities are starting to build subways, and subway travel accounts for an increasingly larger proportion of people's daily travel.

[0003] As a crucial component of rail vehicles, the bogie assembly, to ensure the flexibility of the base mounting device during vehicle braking, is secured to the frame assembly using round pins. The steel bushings on the frame assembly and their mounting holes are fitted with an interference fit. New bushings need to be press-fitted when constructing a new frame assembly, and the steel bushings also need to be replaced during maintenance. Because the bushing mounting holes and bushings are fitted with an interference fit, the outer diameters of both the bushing mounting holes and the bushings must be measured before pressing in the bushings, and then the interference fit must be selected. After replacing the bushings in the frame assembly, bushings frequently detach from the mounting holes during vehicle operation, posing a significant safety hazard. Currently, there is no dedicated device for detecting bushing looseness after installing new bushings, making it impossible to ensure that the selected bushing interference fit meets requirements. Therefore, designing a technology that allows operators to easily inspect bushing reliability is the technical problem this invention aims to solve. Summary of the Invention

[0004] This application provides a method for detecting loose bushings in bogie frames, which enables operators to easily detect whether bushings are loose by using a bushing loosening detection device, thus facilitating on-site inspection by operators.

[0005] To achieve the above technical objectives, this application adopts the following technical solution: In one aspect, this application provides a method for detecting bushing looseness in a bogie frame, using a bushing looseness detection device. The bushing looseness detection device includes a power-assisted robotic arm and a detection assembly. The detection assembly includes a hydraulic cylinder, a detection mechanism, a mounting assembly, and a pressure sensor. The pressure sensor is mounted on the end of the piston rod of the hydraulic cylinder and is in contact with the detection mechanism. The detection mechanism is provided with multiple detection heads that can move closer to or further away from each other. The mounting assembly is clamped by the multiple detection heads. Each detection head has a first boss and a second boss. The detection methods include: S1: Move the detection component to the location of the bushing in the frame that needs to be detected; S2: The mounting component passes through the mounting bushing section on the frame; S3: Manually rotate the operating handle to allow the grooved wheel to rotate under the action of the operating lever. By manually adjusting the operating lever, the first protrusion on the detection head can pass through the bushing on the frame, while the second protrusion on the detection head does not pass through the bushing but can contact the edge of the bushing, ensuring that the second protrusion on the detection head contacts the edge of the bushing. S4: The cylinder body and the frame are fixed together by the mounting components; S5: The piston rod of the hydraulic cylinder drives the detection mechanism to move. At the same time, observe the pressure display screen of the pressure sensor until the reading on the pressure display screen is within the set range. Then check the reading displayed on the hydraulic cylinder piston rod displacement sensor screen.

[0006] Furthermore, the power-assisted robotic arm includes a base, a column, a cylinder, a lever, a swing arm, and a mounting column. The column is vertically arranged and rotatably mounted on the base. The lever is rotatably mounted on the top of the column. The cylinder is hinged between the lever and the column. The swing arm is rotatably mounted on the free end of the lever. The mounting column is rotatably mounted on the swing arm. The installation assembly includes a fixing rod, a tightening nut, an opening limiting plate, and a limiting sleeve; one end of the fixing rod is threaded and the other end is grooved; the groove on the fixing rod is used in conjunction with the opening limiting plate, and the limiting sleeve is fitted onto the fixing rod. The specific detection methods include: S1: Move the detection component to the location of the bushing in the frame that needs to be detected; S2: The fixing rod passes through the middle of the detection assembly and through the bushing mounting part on the frame; S3: Manually rotate the operating handle to allow the grooved wheel to rotate under the action of the operating lever. By manually adjusting the operating lever, the first protrusion on the detection head can pass through the bushing on the frame, while the second protrusion on the detection head does not pass through the bushing but can contact the edge of the bushing. After ensuring that the second protrusion on the detection head has good contact with the edge of the bushing, manually tighten the operating handle to finally ensure that the grooved wheel stops rotating. S4: Insert the opening limiting plate into the groove at one end of the fixing rod, and then adjust the piston rod to extend by controlling the cylinder switch so that the opening limiting plate contacts the frame body. Finally, under the action of the installation components, the cylinder body and the frame body are fixed together. S5: After the cylinder body is fixed to the frame body, manually control the cylinder switch to make the piston rod drive the detection mechanism to move. At the same time, observe the pressure sensor display screen until the pressure display screen shows a reading within the set range. Then check the reading displayed on the cylinder piston rod displacement sensor screen. If the displacement sensor screen shows a displacement, it indicates that the bushing is loose.

[0007] Furthermore, the mounting column is provided with a mounting plate for fixing the hydraulic cylinder and a handle for manually operating the hydraulic cylinder.

[0008] Furthermore, the detection mechanism also includes a grooved wheel, a positioning column, a fixed base, and a slider; The grooved wheel and the fixed base are connected by a positioning post. The multiple sliders can slide relatively close to or far away from each other on the fixed base. The detection head is disposed on the slider.

[0009] Furthermore, the fixing base is provided with multiple positioning grooves, which are radially distributed around the center of the fixing base; The slider is provided with a guide slide rod, which is slidably disposed in the positioning groove.

[0010] Furthermore, the bushing loosening detection device includes a chassis; The base is mounted on the chassis, and the hydraulic cylinder is located at the lower end of the mounting column.

[0011] Furthermore, the chassis uses a Mechner mother wheel.

[0012] The technical effects and advantages of this invention are: it has a simple structure, is easy to use, and can effectively detect whether the bushing of the bogie frame of railway passenger cars, subways and other locomotives meets the interference requirements after pressing. It can effectively detect whether the bushing is loose and effectively avoid the safety hazards caused by the bushing falling off due to the selection of the bushing interference not meeting the requirements. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the auxiliary bushing loosening detection device for railway passenger car bogie frame; Figure 2 This is a schematic diagram of the structure of the assisted robotic arm for the bogie frame of a railway passenger car; Figure 3 This is a schematic diagram of the detection component of the power-assisted bushing loosening detection device for railway passenger car bogie frame; Figure 4 This is a schematic diagram of the hydraulic cylinder structure of the power-assisted bushing loosening detection device for railway passenger car bogie frame; Figure 5This is a schematic diagram of the detection component of the power-assisted bushing loosening detection device for railway passenger car bogie frame; Figure 6 This is an exploded view of the structure of the component tested by the auxiliary bushing loosening detection device for railway passenger car bogie frame; Figure 7 This is a schematic diagram of the detection head structure of the auxiliary bushing loosening detection device for railway passenger car bogie frame; Figure 8 This is a schematic diagram of the fixing plate structure of the power-assisted bushing loosening detection device for railway passenger car bogie frame; Figure 9 This is a schematic diagram of the grooved wheel disc structure of the power-assisted bushing loosening detection device for railway passenger car bogie frame; Figure 10 This is a schematic diagram of the installation components for the auxiliary bushing loosening detection device for railway passenger car bogie frame; Figure 11 This is an exploded view of the installation component of the auxiliary bushing loosening detection device for railway passenger car bogie frame; Figure 12 This is a schematic diagram of the process of detecting bushing looseness using a power-assisted bushing loosening detection device for railway passenger car bogie frames; Figure 13 This is an enlarged schematic diagram of the process of detecting bushing looseness using a power-assisted bushing loosening detection device for railway passenger car bogie frames.

[0015] The attached figures are labeled as follows: chassis 100, power-assisted robotic arm 200, base 210, column 220, cylinder 230, arm 240, swing arm 250, mounting column 260, handle 261, cylinder mounting plate 262, rotating mechanism 270, brake 280, detection component 300, cylinder 310, cylinder body 311, cylinder mounting base 312, piston rod 313, pressure sensor 314, detection mechanism 320, grooved wheel 321, arc groove 36, operating rod fixing hole 37, inner hole 1 38, positioning column. 325, fixed seat 322, slider groove 31, positioning groove 32, pressure plate mounting groove 33, operating rod groove 34, inner hole 2 35, slider 301, pressure plate 328, detection head 326, first boss 361, second boss 362, reinforcing rib 363, fixing bolt hole 364, fixing washer 323, operating handle 324, operating rod 325, fixing screw 327, mounting assembly 330, fixing rod 331, tightening nut 334, opening limit plate 332, limit sleeve 333, bushing 400. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] like Figures 1 to 13 As shown, one embodiment of this application proposes a bushing removal and installation device for a bogie frame, including: a chassis 100, a power-assisted robotic arm 200, and a detection component 300.

[0018] The chassis 100 uses Mechner wheel hubs, enabling omnidirectional movement.

[0019] The power-assisted robotic arm 200 is composed of a base 210, a column 220, a cylinder 230, a boom 240, a swing arm 250, and a mounting column 260. A rotating mechanism 270 is provided between the column 220 and the base 210, between the swing arm 250 and the boom 240, and between the swing arm 250 and the mounting column 260. A brake 280 is installed between the rotating mechanisms 270, which can stop the operation at different heights and positions at any time. The mounting column 260 is provided with a cylinder mounting plate 262 fixed to the cylinder body 311, and a handle 261 for manually operating the cylinder.

[0020] The detection assembly 300 includes a hydraulic cylinder 310, a detection mechanism 320, and a mounting assembly 330. The hydraulic cylinder 310 consists of a piston rod 313, a cylinder body 311, a cylinder mounting base 312, and a pressure sensor 314. The piston rod 313 has a hollow structure with an internal cavity. The cylinder body 311 is equipped with a mounting base 312 for fixing the hydraulic cylinder 310. The detection mechanism 320 consists of a grooved wheel disc 321, a positioning pin 325, a mounting base 322, a fixing washer 323, a slider 301, a pressure plate 328, a detection head 326, an operating handle 324, an operating rod 325, and fixing screws 327. The central groove wheel 321 is provided with an arc groove 36, an operating rod fixing hole 37, and an inner hole 38. The fixing seat 322 is provided with a slider groove 31, a positioning groove 32, a pressure plate mounting groove 33, an operating rod fixing hole 37, and an inner hole 35. The detection head 326 is provided with a first boss 361, a second boss 362, a reinforcing rib 363, and a fixing bolt hole 364. The mounting assembly 330 is composed of a fixing rod 331, a tightening nut 334, an opening limiting plate 332, and a limiting sleeve 333. One end of the fixing rod 331 is provided with a thread, and the other end is provided with a groove. The groove on the fixing rod 331 is used in conjunction with the opening limiting plate 332.

[0021] The column 220 is vertically arranged and rotatably mounted on the base 210. The arm 240 is rotatably mounted on the top of the column 220. The cylinder 230 is hinged between the arm 240 and the column 220. The swing arm 250 is rotatably mounted on the free end of the arm 240. The mounting column 260 is rotatably mounted on the swing arm 250.

[0022] The detection mechanism 320 is provided with a plurality of detection heads 326 that can move closer to or further away from each other. The detection mechanism 320 is mounted on the piston rod of the hydraulic cylinder 310, and the mounting assembly 330 is clamped by the plurality of detection heads 326. The base 210 is mounted on the chassis 100, and the hydraulic cylinder 310 is mounted at the lower end of the mounting column.

[0023] The mounting column 260 is provided with a mounting plate 262 for fixing the hydraulic cylinder 310 and a handle 261 for manually operating the hydraulic cylinder.

[0024] The grooved wheel 321 and the fixed seat 322 in the detection mechanism 320 are connected by a positioning post 325. The multiple sliders 301 can slide relatively close to or away from each other on the fixed seat 322. The detection head 326 is disposed on the sliders 301.

[0025] The fixed base 322 is provided with multiple positioning grooves 32, which are radially distributed around the center of the fixed base 322; the slider 301 is provided with a guide slide rod 329, which is slidably disposed in the positioning grooves 32.

[0026] Furthermore, the fourth protrusion 364 of the detection head 326 can be configured as an adjustable structure.

[0027] Furthermore, the cylinder mounting base 312 is fixed to the cylinder mounting plate 262 by bolts.

[0028] Furthermore, the second boss 362 is used for bushing loosening detection.

[0029] Furthermore, the pressure sensor 314 is installed at the end of the piston rod 313, and the pressure sensor 314 contacts the fixed seat 322 of the detection mechanism 320, and displays the pressure sensor value on the pressure sensor display screen.

[0030] Furthermore, the hydraulic cylinder 310 is equipped with a displacement sensor, which can detect the displacement of the piston rod 313 and display the displacement on the displacement sensor display screen.

[0031] Furthermore, the maximum pressure required for bushing testing needs to be calculated based on the bushing interference fit, bushing specifications, bushing mating surface length, and the materials of the bushing and bushing mounting base.

[0032] This invention patent also provides a method for detecting bushing looseness, as follows: S1: Manually control the chassis to move to the vicinity of the frame, and operate the handle on the mounting column to move the detection component to the position of the bushing to be detected on the frame; S2: The fixing rod passes through the middle of the detection assembly and through the bushing mounting part on the frame; S3: Manually rotate the operating handle to allow the grooved wheel to rotate under the action of the operating lever. By manually adjusting the operating lever, the first protrusion on the detection head can pass through the bushing on the frame, while the second protrusion on the detection head does not pass through the bushing but can contact the edge of the bushing. After ensuring that the second protrusion on the detection head has good contact with the edge of the bushing, manually tighten the operating handle to finally ensure that the grooved wheel stops rotating. S4: Insert the opening limiting plate into the groove at one end of the fixing rod, and then adjust the piston rod to extend by controlling the cylinder switch so that the opening limiting plate contacts the frame body. Finally, under the action of the installation components, the cylinder body and the frame body are fixed together. S5: After the cylinder body is fixed to the frame body, manually control the cylinder switch to make the piston rod drive the detection mechanism to move. At the same time, observe the pressure sensor display screen until the pressure display screen shows a reading within the set range. Then check the reading displayed on the cylinder piston rod displacement sensor screen. If the displacement sensor screen shows a displacement, it indicates that the bushing is loose.

[0033] It features a simple structure and convenient use, and can effectively detect whether the bushing of the bogie frame of railway passenger cars, subways and other locomotives meets the interference requirements after pressing. It can also effectively detect whether the bushing is loose, and effectively avoid the safety hazards caused by the bushing falling off due to the selection of the bushing interference not meeting the requirements.

[0034] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed in this application.

Claims

1. A method of detecting looseness of a bush for a bogie frame, characterized by, The bushing looseness detection device comprises a power-assisted mechanical arm and a detection assembly, the detection assembly comprises an oil cylinder, a detection mechanism, a mounting assembly and a pressure sensor; the pressure sensor is installed at the end of the piston rod of the oil cylinder and is in contact with the detection mechanism; the detection mechanism is provided with a plurality of detection heads which can approach or move away from each other; the mounting assembly is clamped by the plurality of detection heads; the detection head is provided with a first boss and a second boss; The detection method comprises the following steps: S1: moving the detection assembly to the position of the bushing to be detected on the frame; S2: the mounting assembly passes through the position of the installed bushing on the frame; S3: manually rotating the operating handle so that the groove wheel disc can rotate under the action of the operating rod; by manually adjusting the operating rod, the first boss on the detection head can pass through the bushing on the frame, and the second boss on the detection head does not pass through the bushing and can be in contact with the edge of the bushing, thereby ensuring that the second boss on the detection head is in contact with the edge of the bushing; S4: fixing the oil cylinder body and the frame together under the action of the mounting assembly; S5: the piston rod of the oil cylinder drives the detection mechanism to move, and at the same time, the pressure display screen of the pressure sensor is observed until the display value of the pressure display screen is within the set range, and then the display value of the displacement sensor display screen of the piston rod of the oil cylinder is observed.

2. The method of claim 1, wherein: The power-assisted mechanical arm comprises a base, a stand, a cylinder, an arm, a swing arm and a mounting column; the stand is vertically arranged and rotatably arranged on the base; the arm is rotatably arranged at the top of the stand; the cylinder is hinged between the arm and the stand; the swing arm is rotatably arranged at the free end of the arm; and the mounting column is rotatably arranged on the swing arm. The mounting assembly comprises a fixed rod, a tightening nut, an open limiting plate and a limiting sleeve; one end of the fixed rod is provided with a thread, and the other end is provided with a groove; the groove on the fixed rod is used in cooperation with the open limiting plate; and the limiting sleeve is sleeved on the fixed rod. The detection method specifically comprises the following steps: S1: moving the detection assembly to the position of the bushing to be detected on the frame; S2: the fixed rod passes through the middle of the detection assembly and the position of the installed bushing on the frame; S3: manually rotating the operating handle so that the groove wheel disc can rotate under the action of the operating rod; by manually adjusting the operating rod, the first boss on the detection head can pass through the bushing on the frame, and the second boss on the detection head does not pass through the bushing and can be in contact with the edge of the bushing, thereby ensuring that the second boss on the detection head is in contact with the edge of the bushing; S4: inserting the open limiting plate into the groove at one end of the fixed rod, and then adjusting the piston rod to extend by controlling the oil cylinder switch so that the open limiting plate is in contact with the frame body, and finally fixing the oil cylinder body and the frame body together under the action of the mounting assembly; S5: after the oil cylinder body and the frame body are fixed, manually controlling the oil cylinder switch so that the piston rod drives the detection mechanism to move, and at the same time, the pressure display screen of the pressure sensor is observed until the display value of the pressure display screen is within the set range, and then the display value of the displacement sensor display screen of the piston rod of the oil cylinder is observed; if the displacement sensor display screen displays displacement, it indicates that the bushing is loose.

3. The method of claim 2, wherein: the method further comprises: determining a difference between the first and second values; and determining that the bushing is loose if the difference is greater than a predetermined threshold. The mounting column is provided with a mounting plate for fixing the oil cylinder and a handle for manually operating the oil cylinder.

4. The method of claim 2, wherein: the method further comprises: determining a difference between the first and second values; and determining that the bushing is loose if the difference is greater than a predetermined threshold. The detection mechanism further comprises a groove wheel disc, a positioning column, a fixing seat and a sliding block. The groove wheel disc and the fixing seat are connected through the positioning column, a plurality of sliding blocks can slide relatively close to or away from each other on the fixing seat, and the detection head is arranged on the sliding block.

5. The method of claim 4, wherein: A plurality of positioning grooves are arranged on the fixing seat and are distributed radially around the center of the fixing seat. A guide sliding rod is arranged on the sliding block and is slidably arranged in the positioning groove.

6. The method of claim 2, wherein: The bushing loosening detection device comprises a base plate. The base is arranged on the base plate, and the oil cylinder is arranged at the lower end of the mounting column.

7. The method of claim 6, wherein: The base plate adopts a McNamar wheel.

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