CN212134397U - Pneumatic servo device and drag friction testing machine - Google Patents
Pneumatic servo device and drag friction testing machine Download PDFInfo
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- CN212134397U CN212134397U CN202020939691.2U CN202020939691U CN212134397U CN 212134397 U CN212134397 U CN 212134397U CN 202020939691 U CN202020939691 U CN 202020939691U CN 212134397 U CN212134397 U CN 212134397U
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Abstract
The utility model provides a pneumatic servo device and drag friction test machine relates to the friction test machine field, including cylinder and pneumatic servo valve, the cylinder fit in has the piston rod, and the output cooperation of piston rod has the brake piston, and the brake piston is used for cooperating the braking oil pipe of braking pincers, and pneumatic servo valve is connected with the cylinder cooperation, the cylinder passes through pneumatic servo valve and inserts the air supply, utilizes high-pressure gas as the power supply, drives the actuating cylinder action, can utilize the quick response quick drive brake piston of cylinder to the quick response action of braking pincers under the simulation vehicle emergency braking condition satisfies experimental simulation demand.
Description
Technical Field
The utility model relates to a friction test machine field, in particular to pneumatic servo device and drag friction test machine.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The friction testing machine is common wear performance experimental equipment, simulates an actual use scene through arrangement of elements, performs friction experiments on a sample, and acquires friction data for analysis; the vehicle brake component comprises a caliper disc brake and a brake pad, when the friction test is carried out on the vehicle brake component such as a brake disc, the friction test is carried out on the brake pad through the caliper disc brake, and a servo driving mechanism is required to be additionally arranged on a hydraulic pipeline for driving the caliper disc brake.
The inventor finds that a common servo driving mechanism realizes hydraulic-hydraulic loading conversion by taking a hydraulic station or a servo motor as power and taking the hydraulic station as a power source, utilizes a rod piece of a hydraulic cylinder to push a driving oil path of a brake to realize opening and closing of the brake, but needs a hydraulic station with larger volume, needs to be arranged outside equipment and is not beneficial to integration; when the motor is used as a power source, the motor is driven by the servo motor and the lead screw slider mechanism, so that the motor-hydraulic loading conversion is realized, a driving oil way of the brake is pushed, and the brake is opened and closed; the two power sources are slow in response speed, only can simulate brake action during slow and slow braking, cannot simulate the rapid pushing condition during the emergency braking state of a vehicle when pushing the driving oil way of the brake, cannot simulate the driving oil way change condition during rapid point braking, and are difficult to meet the requirements.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the defect that prior art exists, provide a pneumatic servo device and drag friction test machine, utilize high-pressure gas as the power supply, drive the actuating cylinder action, can utilize the quick response of cylinder to drive the braking piston fast to the quick response action of braking pincers under the simulation vehicle emergency braking condition satisfies experimental simulation demand.
The first purpose of the present disclosure is to provide a pneumatic servo device, which adopts the following technical scheme:
the pneumatic brake system comprises a cylinder and a pneumatic servo valve, wherein a piston rod is matched in the cylinder, a brake piston is matched at the output end of the piston rod and used for being matched with a brake oil pipe of a brake caliper, the pneumatic servo valve is matched and connected with the cylinder, and the cylinder is connected into an air source through the pneumatic servo valve.
Furthermore, the air source is an air pump, and the air pump is connected to the pneumatic servo valve through an air pipe.
Further, the pneumatic servo valve is matched with a controller and used for controlling air pressure in the air cylinder and adjusting acting force of the piston rod on the brake piston.
Furthermore, a force sensor is arranged on the brake piston to measure the pressure applied by the piston rod to the brake piston.
Furthermore, the end face of the brake piston is connected with a piston rod, the outer circumferential surface of the brake piston is tightly attached to the inner wall of the brake oil pipe, and the piston rod pushes the brake piston to axially reciprocate along the brake oil pipe so as to control the opening and closing force of the brake caliper.
The second purpose of this disclosure is to provide a drag friction testing machine, adopt following technical scheme:
the pneumatic servo device is installed on the frame through a support, the test bed is provided with a brake caliper, a brake oil pipe of the brake caliper is matched with a brake piston, and the brake oil pipe drives the brake caliper to open and close.
Furthermore, the pneumatic servo valve and the cylinder are respectively arranged on the support, the brake oil pipe is led out to one end of the cylinder from the brake caliper, and the piston rod is connected with the brake piston.
Furthermore, the pneumatic servo valve is connected to an external air source through an air pipe, and high-pressure air is obtained from the external air source and is controlled to be output to the air cylinder.
Furthermore, a loading feedback mechanism is installed on the brake caliper and used for measuring the braking force applied to the test sample by the brake caliper.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) high-pressure gas is used as a power source for driving the brake caliper, and the high-pressure gas is converted into reciprocating motion of a piston rod through a cylinder, so that the brake piston is driven to slide relatively in a brake oil pipe, and the brake caliper is driven to open and close; the quick response of the cylinder under high-pressure gas can drive the piston rod to quickly act, so that the quick braking action in the actual operation process is simulated, the stress of the test sample in the actual working state is better fitted in the test process, and the precision of the data obtained in the test is improved;
(2) the pneumatic servo valve is used as an element for controlling a power source, and the pressure of high-pressure gas input into the cylinder is subjected to stepless regulation, so that the piston rod can be driven by the cylinder to apply different thrust forces to the brake piston, the pneumatic servo process is realized, and the brake process with different force in the actual operation process is simulated;
(3) the stress state of the brake piston is measured by the force sensor, the state of the brake piston is monitored in real time, and feedback control is realized on the loading process of the brake caliper by matching with a loading feedback mechanism on the brake caliper, so that the control precision in the test process is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic view of the overall structure of a pneumatic servo device in embodiments 1 and 2 of the present disclosure;
in the figure, 1 is a pneumatic servo valve, 2 is a cylinder, 3 is a piston rod, 4 is a brake piston, and 5 is a brake oil pipe.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
Just as introducing in the background art, the structural response speed that provides power for the brake caliper among the prior art is slower, can only simulate the brake action when slowly braking, can't simulate the quick promotion condition when the vehicle state of suddenly braking when promoting the drive oil circuit of brake, also can't simulate the drive oil circuit situation of change when the quick point braking, is difficult to satisfy the demand, to above-mentioned problem, this disclosure provides a pneumatic servo device and drags friction test machine.
Example 1
In an exemplary embodiment of the present disclosure, a pneumatic servo is provided, as shown in fig. 1.
The pneumatic brake system mainly comprises a cylinder 2 and a pneumatic servo valve 1, wherein the cylinder is connected to a gas source through the pneumatic servo valve and obtains high-pressure gas from the gas source, the tail end of a piston rod 3 in the cylinder is connected with a brake piston 4, a brake caliper is matched with a brake oil way, the tail end of the brake oil way is provided with a brake oil pipe 5, the brake piston is matched with the brake oil pipe to form a hydraulic cylinder structure, and the piston rod drives the brake piston to slide in a reciprocating manner along the radial direction of the brake oil pipe, so that the brake caliper is;
the force of the brake piston matched with a brake oil pipe can be changed by adjusting the length of the moving path at the tail end of the piston rod, so that the braking force of the brake caliper is adjusted, and the accurate simulation of the braking process is realized;
the high-pressure gas is utilized to drive the cylinder, the cylinder can drive the piston rod to respond quickly, and the process of emergency braking in an actual scene is simulated;
the motion direction of the piston rod is adjusted repeatedly, the process of frequently inching and stopping in the actual scene can be simulated, compared with the traditional hydraulic pressure and electric power as power sources, the air pressure is adopted as the power source to cooperate with the air cylinder to obtain the braking condition under different scenes, so that the diversity of friction tests is improved, and the action condition of the brake caliper under different use conditions in the actual use can be fully simulated.
Specifically, in this embodiment, the air source is an air pump, and the air pump is connected to the pneumatic servo valve through an air pipe;
for the gas source, when the pneumatic servo device integrally works in a workshop, high-pressure gas pipelines are arranged in the general workshop and are directly connected to a high-pressure gas joint reserved in the workshop through a gas pipe;
when the pneumatic servo device works independently, an air pump can be configured for the pneumatic servo device, and the air pump is used as an air source and is connected into the pneumatic servo valve through an air pipe.
Of course, it can be understood that, in order to ensure the accuracy of the cylinder operation, the gas source needs to provide high-pressure gas with constant pressure for the cylinder, so as to reduce the fluctuation of the pressure of the high-pressure gas, and if necessary, a pressure stabilizing device may be additionally installed between the gas source and the pneumatic servo valve, so as to ensure that the output pressure can be maintained at a required pressure value.
Specifically, in this embodiment, the pneumatic servo valve is matched with a controller, and the controller adjusts and controls the action of the pneumatic servo valve, so that the gas pressure output to the cylinder can be adjusted as required, and then the action of the piston rod is adjusted accordingly, and the acting force of the piston rod on the brake piston is adjusted.
The pneumatic servo valve can be subjected to model selection according to requirements, stepless regulation of an output air pressure value is achieved, and therefore accurate regulation of the output force of the piston rod is achieved.
For the brake piston, a force sensor is arranged on the brake piston, the driving force of the piston rod to the brake piston is measured, and the driving force is collected as reference data during testing so as to be convenient for adjusting the driving force;
the end surface of the brake piston is connected with a piston rod, the outer circumferential surface of the brake piston is tightly attached to the inner wall of the brake oil pipe, and the piston rod pushes the brake piston to axially reciprocate along the brake oil pipe so as to control the opening and closing force of the brake caliper;
the piston rod drives the brake piston to move in the brake oil pipe, the opening and closing speed of the brake caliper is changed, and the conditions of different brake speeds are simulated;
the piston rod drives the brake piston to move for the length of the actuating force in the brake oil pipe, and the opening and closing degree of the brake caliper is changed, so that the brake force of the brake caliper is adjusted, and the conditions under different brake forces are simulated.
High-pressure gas is used as a power source for driving the brake caliper, and the high-pressure gas is converted into reciprocating motion of a piston rod through a cylinder, so that the brake piston is driven to slide relatively in a brake oil pipe, and the brake caliper is driven to open and close;
the quick response of the cylinder under the high-pressure gas can drive the quick action of the piston rod, so that the emergency brake action in the actual operation process is simulated, the test process is more fit with the stress of the sample in the actual working state, and the precision of the test acquired data is improved.
Example 2
In another exemplary embodiment of the present disclosure, a drag friction tester is provided and includes the pneumatic servo device described in example 1.
The pneumatic servo device is arranged on the rack through a corresponding support, a brake caliper communicated with the pneumatic servo device is arranged on the test bed, and the arrangement of other elements is correspondingly arranged according to the existing testing machine;
the brake oil pipe of the brake caliper is matched with the brake piston, and the brake oil pipe drives the brake caliper to open and close under the action of the brake piston, so that the brake action of a vehicle in the running process is simulated.
Specifically, the pneumatic servo valve and the cylinder are respectively arranged on a support, the brake oil pipe is led out to one end of the cylinder from the brake caliper, and the piston rod is connected with the brake piston;
the pneumatic servo valve is controlled according to test requirements, so that the action of the cylinder driving the piston rod to output can meet the requirements, the switching speed and the opening degree of the pneumatic servo valve are adjusted, the opening and closing frequency and the moving speed of the cylinder are adjusted, and different brake actions are simulated.
In this embodiment, the pneumatic servo valve is connected to an external air source through an air pipe, and high-pressure air is obtained from the external air source and is controlled to be output to the air cylinder;
of course, it can be understood that when it is inconvenient to access an external air source, an air pump can be configured, the air pump is mounted on the frame, and the output end of the air pump is connected to the pneumatic servo valve through an air pipe to provide high-pressure air for the pneumatic servo valve.
Furthermore, a loading feedback mechanism is installed on the brake caliper and used for measuring the braking force applied to the test sample by the brake caliper;
the stress state of the brake piston is measured by the force sensor, the state of the brake piston is monitored in real time, and feedback control is realized on the loading process of the brake caliper by matching with a loading feedback mechanism on the brake caliper, so that the control precision in the test process is improved.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The pneumatic servo device is characterized by comprising an air cylinder and a pneumatic servo valve, wherein a piston rod is matched in the air cylinder, a brake piston is matched at the output end of the piston rod and used for being matched with a brake oil pipe of a brake caliper, the pneumatic servo valve is matched and connected with the air cylinder, and the air cylinder is connected into an air source through the pneumatic servo valve.
2. The pneumatic servo device of claim 1, wherein the air source is an air pump, and the air pump is connected to the pneumatic servo valve through an air pipe.
3. A pneumatic servo arrangement as claimed in claim 1, wherein the pneumatic servo valve is fitted with a controller for controlling the air pressure in the cylinder to adjust the force of the piston rod on the brake piston.
4. The pneumatic servo of claim 1, wherein the brake piston is provided with a force sensor for measuring the pressure exerted by the piston rod on the brake piston.
5. The pneumatic servo device as claimed in claim 4, wherein the braking piston is connected with a piston rod, the outer circumference surface of the braking piston is closely attached to the inner wall of the braking oil pipe, and the piston rod pushes the braking piston to reciprocate along the axial direction of the braking oil pipe for controlling the opening and closing force of the brake caliper.
6. A drag friction tester comprising a pneumatic servo device according to any one of claims 1 to 5.
7. The drag friction tester according to claim 6, further comprising a frame and a test stand, wherein the pneumatic servo device is mounted on the frame through a bracket, the test stand is provided with a brake caliper, a brake oil pipe of the brake caliper is matched with the brake piston, and the brake oil pipe drives the brake caliper to open and close.
8. The drag friction tester according to claim 7 wherein the pneumatic servo valve and the cylinder are mounted on a bracket, respectively, the brake oil pipe is led out from the brake caliper to one end of the cylinder, and the piston rod is connected to the brake piston.
9. The drag friction tester as claimed in claim 7 wherein the pneumatic servo valve is connected to an external gas source through a gas pipe, and high pressure gas is taken from the external gas source and controlled to be output to the cylinder.
10. The drag friction tester as claimed in claim 7 wherein a loading feedback mechanism is mounted on the brake caliper for measuring the braking force applied by the brake caliper on the test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020939691.2U CN212134397U (en) | 2020-05-27 | 2020-05-27 | Pneumatic servo device and drag friction testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020939691.2U CN212134397U (en) | 2020-05-27 | 2020-05-27 | Pneumatic servo device and drag friction testing machine |
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| Publication Number | Publication Date |
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| CN212134397U true CN212134397U (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020939691.2U Active CN212134397U (en) | 2020-05-27 | 2020-05-27 | Pneumatic servo device and drag friction testing machine |
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| CN (1) | CN212134397U (en) |
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- 2020-05-27 CN CN202020939691.2U patent/CN212134397U/en active Active
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