CN116008107A - High-low temperature flexural fatigue test method and test bench for pneumatic brake hose - Google Patents
High-low temperature flexural fatigue test method and test bench for pneumatic brake hose Download PDFInfo
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- CN116008107A CN116008107A CN202310062940.2A CN202310062940A CN116008107A CN 116008107 A CN116008107 A CN 116008107A CN 202310062940 A CN202310062940 A CN 202310062940A CN 116008107 A CN116008107 A CN 116008107A
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Abstract
The invention relates to the technical field of braking, in particular to a high-low temperature flexural fatigue test method of an air brake hose and a test bed thereof, comprising the steps of extracting the full stroke of the suspension of a whole vehicle based on the motion characteristics of a front axle and a rear axle of the whole vehicle, turning to the full stroke of left and right, fixing one end of the hose to be tested on a fixed end of a flexural circulation device on a test support, connecting the fixed end of the flexible circulation device to a pressure circulation device, connecting the other end of the hose to the movable end, plugging the other end of the hose to be tested, and placing the whole test support in a temperature control test box; after the test parameters are set, starting a test, synchronously starting the bending circulation device, the pressure circulation device and the temperature control test box, and ending the high-low temperature bending fatigue test of the air brake hose when the working cycle times of the bending circulation device reach a target preset value. The invention fully considers the bending working condition and the high-low temperature environment of the whole vehicle pneumatic brake hose, shortens the verification period and the verification cost of the whole vehicle, and is beneficial to improving the design quality of the pneumatic brake hose.
Description
Technical Field
The invention relates to the technical field of braking, in particular to a high-low temperature flexural fatigue test method and a test bed thereof for an air brake hose.
Background
Pneumatic brake systems are widely used for trucks and some buses, and the brakes are controlled and energy is transferred from an application point by pneumatic transfer means. The pneumatic brake hose is used for transmitting pneumatic pressure to a brake (brake chamber), and the pneumatic brake hose also needs to follow the steering and the jumping of the front wheel and the jumping of the rear axle, and the hose needs to be flexible enough. The bending fatigue performance of the pneumatic brake hose is mainly verified according to GB16897 at present.
On one hand, the working condition of the existing flexure fatigue test is a single moving direction, the actual movement working condition of the whole vehicle cannot be simulated, the effect of bench verification is problematic, and the durable support of the whole vehicle is also required. On the other hand, the temperature of the bench test is set to be normal temperature (25 ℃ -32 ℃), and in practice, the service environment temperature of the hose is between-40 ℃ and 100 ℃, and the current bending fatigue test cannot sufficiently verify the bending fatigue performance of the hose under different temperature conditions.
The air brake hose bending fatigue test based on the prior art has larger difference with the real test condition of the whole vehicle, and often leads to qualified bench test but the air brake hose breaks, leaks gas and other faults under the condition of the whole vehicle, thereby affecting the safety of the whole vehicle.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a high-low temperature flexural fatigue test method and a test bed for the pneumatic brake hose.
According to an embodiment of the first aspect of the invention, the high-low temperature flexural fatigue testing method for the pneumatic brake hose comprises the following steps:
step S100: extracting the full stroke of the suspension of the whole vehicle in a jumping way up and down way and turning to the full stroke in a left-right way based on the motion characteristic conditions of the front axle and the rear axle of the whole vehicle;
step S200: setting up a high-low temperature flexural fatigue test scene of a pneumatic brake hose of the whole vehicle, wherein one end of a hose to be tested is fixed at a fixed end of a flexural circulation device on a test support and is connected to a pressure circulation device, the other end of the hose to be tested is connected to a movable end of the flexural circulation device and is plugged, and the test support containing the hose to be tested and the flexural circulation device is arranged in a temperature control test box in the high-low temperature flexural fatigue test scene of the pneumatic brake hose;
step S300: the test parameter setting comprises full-stroke parameter setting of the flexing circulation device, parameter setting of the pressure circulation device and parameter setting of the temperature control test box, and the test parameter setting is used for simulating the real environment of the whole vehicle during running through synchronous operation of the flexing circulation device, the pressure circulation device and the temperature control test box;
step S400: and starting the high-low temperature flexural fatigue test of the air brake hose, and synchronously starting the flexural circulation device, the pressure circulation device and the temperature control test box to finish the high-low temperature flexural fatigue test of the air brake hose when the working cycle times of the flexural circulation device reach a target preset value.
According to the high-low temperature flexural fatigue test method for the air brake hose, provided by the embodiment of the invention, the full-stroke of the suspension of the whole automobile is extracted based on the motion characteristic conditions of the front axle and the rear axle of the whole automobile, the full-stroke is turned to the left and right, the high-low temperature flexural fatigue test scene of the air brake hose of the whole automobile is built based on the full-stroke of the suspension of the whole automobile, the real motion working condition of the whole automobile is simulated by synchronously working the flexural circulation device, the pressure circulation device and the temperature control test box, the flexural working condition and the high-low temperature environment of the air brake hose of the whole automobile are fully considered, the verification period and the verification cost of the whole automobile are shortened, and the design quality of the air brake hose is improved.
According to some embodiments of the invention, the setting of the full stroke parameter of the flex circulation device includes selecting a full stroke of the flex circulation device for a full stroke of the up-down jump test of the suspension of the whole vehicle to 88% of the full stroke of the suspension of the whole vehicle, performing the full stroke of the up-down jump test at 90 cycle frequencies per minute, selecting a full stroke of the flex circulation device for turning left and right to 88% of the full stroke of the whole vehicle turning left and right, and performing the full stroke of turning left and right at 12 cycle frequencies per minute.
According to some embodiments of the invention, the parameter setting of the pressure cycling apparatus comprises taking 60s as a cycle, raising the sample pressure of the hose to be tested from 0MPa to a target pressure for 30s, then lowering the target pressure to 0MPa, and maintaining for 30s.
According to some embodiments of the invention, the parameter setting of the temperature control test chamber comprises setting the test temperature to three groups respectively, setting the low temperature to-40 ℃, setting the room temperature to 25 ℃, and setting the high temperature to 100 ℃ to sequentially correspond to the low temperature mode, the room temperature mode and the high temperature mode of the temperature control test chamber.
According to some embodiments of the invention, the target pressure is 1MPa, which is used to simulate the real pressure environment of the pneumatic brake hose when the whole vehicle is running.
According to some embodiments of the invention, the duration of the pressure increasing and decreasing process of the pressure circulating device is less than 1 second, so that the pressure circulating device is more fit with the real working condition.
According to some embodiments of the invention, the target preset value of the number of working cycles of the flexion circulation device is 100 ten thousand times; based on 100 ten thousand times of working cycle times of the bending cycle device, the temperature control test box is set to sequentially run according to a high temperature mode, a room temperature mode and a low temperature mode to complete a high and low temperature bending fatigue test of the air brake hose, wherein the bending cycle device works for 20 ten thousand times in the high temperature mode, 50 ten thousand times in the room temperature mode and 30 ten thousand times in the low temperature mode.
According to a second aspect of the present invention, a high-low temperature flexural fatigue test stand for a pneumatic brake hose is provided, which is applied to the above method for testing high-low temperature flexural fatigue of a pneumatic brake hose, and includes:
the bending circulation device is used for carrying out bending circulation test on the hose to be tested, and comprises a fixed support, a front-back direction displacement circulation device, an up-down direction displacement circulation device and a left-right direction displacement circulation device, wherein the fixed support is arranged at the action end of the left-right direction displacement circulation device, the fixed support is provided with the up-down direction displacement circulation device, the action end of the up-down direction displacement circulation device is connected with the front-back direction displacement circulation device, and the action end of the front-back direction displacement circulation device is fixedly provided with the hose to be tested;
the pressure circulation device comprises a pipeline connected with the air pump, the pipeline is connected with one end of a hose to be tested, and the pipeline is provided with an inflation electromagnetic valve and a release electromagnetic valve;
the temperature control test box is internally provided with a regulating device for regulating the internal temperature of the temperature control test box, a temperature sensor and a temperature display, wherein the temperature sensor is electrically connected with the temperature display and is used for monitoring the temperature environment of the high-low temperature flexural fatigue test of the air brake hose.
According to some embodiments of the invention, the displacement strokes of the front-back direction displacement circulating device, the up-down direction displacement circulating device and the left-right direction displacement circulating device are all 0-100 mm so as to adapt to the actual working condition of the real whole vehicle.
The high-low temperature flexural fatigue test method and the test bench of the air brake hose can effectively simulate the flexural working condition and the high-low temperature environment of the air brake hose of the whole vehicle, shorten the verification period and the verification cost of the whole vehicle, and are beneficial to improving the design quality of the air brake hose.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for testing high and low temperature flexural fatigue of a pneumatic brake hose in accordance with an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is exemplary, with reference to the accompanying drawings, it being understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit the application.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the embodiment provides a method for testing high-low temperature flexural fatigue of an air brake hose, which includes:
step S100: extracting the full stroke of the suspension of the whole vehicle in a jumping way up and down way and turning to the full stroke in a left-right way based on the motion characteristic conditions of the front axle and the rear axle of the whole vehicle;
step S200: setting up a high-low temperature flexural fatigue test scene of a gas brake hose of the whole vehicle, wherein one end of the hose to be tested is fixed at the fixed end of a flexural circulation device on a test support and is connected to a pressure circulation device, the other end of the hose to be tested is connected to the moving end of the flexural circulation device and is plugged, the test support containing the hose to be tested and the flexural circulation device is arranged in a temperature control test box in the high-low temperature flexural fatigue test scene of the gas brake hose, the full stroke parameter setting of the flexural circulation device comprises that the full stroke of the up-down jump test in the selected flexural circulation device is 88% of the full stroke of the suspension of the whole vehicle, the up-down jump full stroke test is carried out at 90 cycle frequencies per minute, the steering left-right full stroke in the selected flexural circulation device is 88% of the full stroke of the turning left-right of the whole vehicle, and the turning left-right full stroke test is carried out at 12 cycle frequencies per minute; the parameter setting of the pressure circulation device comprises the steps of taking 60s as a circulation, increasing the sample air pressure of a hose to be tested from 0MPa to a target pressure, maintaining for 30s, then reducing the target pressure to 0MPa, and maintaining for 30s; the parameter setting of the temperature control test box comprises setting the test temperature into three groups respectively, setting the low temperature into-40 ℃, setting the room temperature into 25 ℃, setting the high temperature into 100 ℃, and sequentially corresponding to the low temperature mode, the room temperature mode and the high temperature mode of the temperature control test box.
Step S300: the test parameter setting comprises full-stroke parameter setting of the flexing circulation device, parameter setting of the pressure circulation device and parameter setting of the temperature control test box, and the test parameter setting is used for simulating the real environment of the whole vehicle during running through synchronous operation of the flexing circulation device, the pressure circulation device and the temperature control test box;
step S400: and starting a high-low temperature flexural fatigue test of the air brake hose, synchronously starting the flexural circulation device, the pressure circulation device and the temperature control test box to work, ending the high-low temperature flexural fatigue test of the air brake hose when the number of working cycles of the flexural circulation device reaches a target preset value, and taking out the tested air brake hose to evaluate the flexural fatigue performance.
According to the high-low temperature flexural fatigue test method for the air brake hose, provided by the embodiment of the invention, the full-stroke of the suspension of the whole automobile is extracted based on the motion characteristic conditions of the front axle and the rear axle of the whole automobile, the full-stroke is turned to the left and right, the high-low temperature flexural fatigue test scene of the air brake hose of the whole automobile is built based on the full-stroke of the suspension of the whole automobile, the real motion working condition of the whole automobile is simulated by synchronously working the flexural circulation device, the pressure circulation device and the temperature control test box, the flexural working condition and the high-low temperature environment of the air brake hose of the whole automobile are fully considered, the verification period and the verification cost of the whole automobile are shortened, and the design quality of the air brake hose is improved.
Specifically, the target pressure is 1MPa, and the target pressure is used for simulating the real pressure environment of the air brake hose during the running of the whole vehicle.
Specifically, the duration of the pressure increasing and reducing process of the pressure circulating device is less than 1 second, so that the pressure circulating device is more fit for the actual working condition.
In this embodiment, the target preset value of the number of working cycles of the flexion circulation device is 100 ten thousand times; based on 100 ten thousand times of working cycle times of the bending cycle device, the temperature control test box is set to sequentially run according to a high temperature mode, a room temperature mode and a low temperature mode to complete a high and low temperature bending fatigue test of the air brake hose, wherein the bending cycle device works for 20 ten thousand times in the high temperature mode, 50 ten thousand times in the room temperature mode and 30 ten thousand times in the low temperature mode.
Example 2
According to a second aspect of the present invention, a high-low temperature flexural fatigue test stand for a pneumatic brake hose is provided, which is applied to the above method for testing high-low temperature flexural fatigue of a pneumatic brake hose, and includes:
the bending circulation device is used for carrying out bending circulation test on the hose to be tested, and comprises a fixed support, a front-back direction displacement circulation device, an up-down direction displacement circulation device and a left-right direction displacement circulation device, wherein the fixed support is arranged at the action end of the left-right direction displacement circulation device, the fixed support is provided with the up-down direction displacement circulation device, the action end of the up-down direction displacement circulation device is connected with the front-back direction displacement circulation device, and the action end of the front-back direction displacement circulation device is fixedly provided with the hose to be tested;
the pressure circulation device comprises a pipeline connected with the air pump, the pipeline is connected with one end of a hose to be tested, and the pipeline is provided with an inflation electromagnetic valve and a release electromagnetic valve;
the temperature control test box is internally provided with a regulating device for regulating the internal temperature of the temperature control test box, a temperature sensor and a temperature display, wherein the temperature sensor is electrically connected with the temperature display and is used for monitoring the temperature environment of the high-low temperature flexural fatigue test of the air brake hose.
Specifically, the displacement strokes of the front-back direction displacement circulating device, the up-down direction displacement circulating device and the left-right direction displacement circulating device are all 0-100 mm so as to adapt to the actual working condition of the real whole vehicle.
The high-low temperature flexural fatigue test method and the test bench of the air brake hose can effectively simulate the flexural working condition and the high-low temperature environment of the air brake hose of the whole vehicle, shorten the verification period and the verification cost of the whole vehicle, and are beneficial to improving the design quality of the air brake hose.
Example 3
Based on the above embodiments, this embodiment provides a specific practical case:
and taking a single batch of 100 hoses to be tested, wherein the length of the hoses to be tested is 500mm, one end of the hoses is fixed at the action end of a front-back direction displacement circulating device on a high-low temperature flexural fatigue test stand of the air brake hose, the other end of the hoses to be tested is connected to a pressure circulating device, and both ends of the hoses to be tested are connected with air circuits.
Synchronously starting a flexing circulation device, a pressure circulation device and a temperature control test box to work, wherein the flexing circulation device performs tests in the following sequence, namely a front-back direction (0 to 100 mm), an up-down direction (0 to 100 mm), a left-right direction (0 to 100 mm), an up-down direction (0 to 100 mm) and a front-back direction (0 to 100 mm), so as to complete one cycle, and a total of 100 thousands of cycles are tested;
in the process, the hose to be tested is inflated synchronously, and the inflation process is as follows: the air pressure is 0MPa for 0-30s and 1MPA for 30s-60s, and the air pressure is 60s for one cycle, wherein the duration of the pressure increasing and reducing process is less than 1 second;
based on 100 ten thousand times of working cycle times of the bending cycle device, the temperature control test box is set to sequentially run according to a high temperature mode, a room temperature mode and a low temperature mode to complete a high and low temperature bending fatigue test of the air brake hose, wherein the bending cycle device works for 20 ten thousand times in the high temperature mode, 50 ten thousand times in the room temperature mode and 30 ten thousand times in the low temperature mode.
After the high-low temperature flexural fatigue test of the air brake hose is finished, taking out the tested air brake hose to evaluate the flexural fatigue performance, wherein the verification efficiency and the verification result of the batch of hoses to be tested reach the expectations, and the design quality of the air brake hose is improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application for the embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The high-low temperature flexural fatigue test method for the air brake hose is characterized by comprising the following steps of:
step S100: extracting the full stroke of the suspension of the whole vehicle in a jumping way up and down way and turning to the full stroke in a left-right way based on the motion characteristic conditions of the front axle and the rear axle of the whole vehicle;
step S200: setting up a high-low temperature flexural fatigue test scene of a pneumatic brake hose of the whole vehicle, wherein one end of a hose to be tested is fixed at a fixed end of a flexural circulation device on a test support and is connected to a pressure circulation device, the other end of the hose to be tested is connected to a movable end of the flexural circulation device and is plugged, and the test support containing the hose to be tested and the flexural circulation device is arranged in a temperature control test box in the high-low temperature flexural fatigue test scene of the pneumatic brake hose;
step S300: the test parameter setting comprises full-stroke parameter setting of the flexing circulation device, parameter setting of the pressure circulation device and parameter setting of the temperature control test box, and the test parameter setting is used for simulating the real environment of the whole vehicle during running through synchronous operation of the flexing circulation device, the pressure circulation device and the temperature control test box;
step S400: and starting the high-low temperature flexural fatigue test of the air brake hose, and synchronously starting the flexural circulation device, the pressure circulation device and the temperature control test box to finish the high-low temperature flexural fatigue test of the air brake hose when the working cycle times of the flexural circulation device reach a target preset value.
2. The method for testing high and low temperature flexural fatigue of a pneumatic brake hose as defined in claim 1, wherein the setting of the full stroke parameters of the flexural circulation device includes selecting a full stroke of the flexural circulation device to be 88% of a full stroke of a suspension of the whole vehicle, performing the full stroke test of the suspension of the whole vehicle at 90 cycles per minute, and selecting a full stroke of the flexural circulation device to be 88% of a full stroke of the whole vehicle turning left and right, and performing the full stroke test of the turning left and right at 12 cycles per minute.
3. The method for testing the high-low temperature flexural fatigue of the air brake hose according to claim 1, wherein the parameter setting of the pressure circulating device comprises the steps of taking 60s as one cycle, raising the air pressure of a sample of the hose to be tested from 0MPa to a target pressure for 30s, then lowering the air pressure from the target pressure to 0MPa, and maintaining the air pressure for 30s.
4. The method for testing the high-low temperature flexural fatigue of the air brake hose according to claim 1, wherein the parameter setting of the temperature control test box comprises setting the test temperature to be three groups respectively, setting the low temperature to be-40 ℃, setting the room temperature to be 25 ℃, setting the high temperature to be 100 ℃, and sequentially corresponding to a low temperature mode, a room temperature mode and a high temperature mode of the temperature control test box.
5. The method for testing high and low temperature flexural fatigue of a pneumatic brake hose as recited in claim 1, wherein the target pressure is 1MPa.
6. The method for testing high and low temperature flexural fatigue of a pneumatic brake hose as recited in claim 1, wherein the duration of the pressure increasing and decreasing process of the pressure cycling device is less than 1 second.
7. The method for testing high and low temperature flexural fatigue of a pneumatic brake hose as recited in claim 1, wherein the target preset number of cycles of operation of the flexural cycle device is 100 ten thousand times.
8. The method for testing the high-temperature and low-temperature flexural fatigue of the air brake hose according to claim 7, wherein the temperature control test box is set to sequentially operate according to a high-temperature mode, a room-temperature mode and a low-temperature mode based on 100 ten thousand times of operation cycles of the flexural circulation device, wherein the flexural circulation device is operated 20 ten thousand times in the high-temperature mode, 50 ten thousand times in the room-temperature mode and 30 ten thousand times in the low-temperature mode.
9. A high and low temperature flexural fatigue test stand for a pneumatic brake hose, applied to the method of any one of claims 1-8, comprising:
the bending circulation device is used for carrying out bending circulation test on the hose to be tested, and comprises a fixed support, a front-back direction displacement circulation device, an up-down direction displacement circulation device and a left-right direction displacement circulation device, wherein the fixed support is arranged at the action end of the left-right direction displacement circulation device, the fixed support is provided with the up-down direction displacement circulation device, the action end of the up-down direction displacement circulation device is connected with the front-back direction displacement circulation device, and the action end of the front-back direction displacement circulation device is fixedly provided with the hose to be tested;
the pressure circulation device comprises a pipeline connected with the air pump, the pipeline is connected with one end of a hose to be tested, and the pipeline is provided with an inflation electromagnetic valve and a release electromagnetic valve;
the temperature control test box is internally provided with a regulating device for regulating the internal temperature of the temperature control test box, a temperature sensor and a temperature display, wherein the temperature sensor is electrically connected with the temperature display and is used for monitoring the temperature environment of the high-low temperature flexural fatigue test of the air brake hose.
10. The high-low temperature flexural fatigue testing stand of air brake hose as set forth in claim 9, wherein the displacement travel of the front-back direction displacement circulating device, the up-down direction displacement circulating device and the left-right direction displacement circulating device are all 0-100 mm to adapt to fit the actual working condition of the whole vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310062940.2A CN116008107A (en) | 2023-01-19 | 2023-01-19 | High-low temperature flexural fatigue test method and test bench for pneumatic brake hose |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310062940.2A CN116008107A (en) | 2023-01-19 | 2023-01-19 | High-low temperature flexural fatigue test method and test bench for pneumatic brake hose |
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| CN116008107A true CN116008107A (en) | 2023-04-25 |
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