CN111948021A - High-low temperature device suitable for friction material testing machine - Google Patents

High-low temperature device suitable for friction material testing machine Download PDF

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Publication number
CN111948021A
CN111948021A CN202010842942.XA CN202010842942A CN111948021A CN 111948021 A CN111948021 A CN 111948021A CN 202010842942 A CN202010842942 A CN 202010842942A CN 111948021 A CN111948021 A CN 111948021A
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temperature
low temperature
workpiece
temperature adjusting
fixing groove
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CN202010842942.XA
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Chinese (zh)
Inventor
何巍
崔展娟
党伟伟
徐奇
赵杉
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Luoyang Sunrui Special Equipment Co Ltd
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Wuhan Hirun Engineering Equipment Co ltd
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Priority to CN202010842942.XA priority Critical patent/CN111948021A/en
Publication of CN111948021A publication Critical patent/CN111948021A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/02—Measuring coefficient of friction between materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/56—Investigating resistance to wear or abrasion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0228—Low temperature; Cooling means

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  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Automation & Control Theory (AREA)
  • Engineering & Computer Science (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention belongs to the field of friction material testing machines, and particularly discloses a high-low temperature device suitable for a friction material testing machine. The device comprises a high-low temperature adjusting module, a vertical pressurizing module, a horizontal movement module and a control module, wherein the high-low temperature adjusting module is arranged at the bottom of the vertical pressurizing module and comprises a high-low temperature adjusting outer cover, a workpiece fixing groove, a high-temperature adjusting unit and CO2Low temperature conditioning unit, high temperature conditioning unit and CO2The low-temperature adjusting unit is used for adjusting the temperature of the workpiece fixing groove in a matched mode, the horizontal movement module is arranged below the workpiece fixing groove, the control module comprises a temperature detection unit and a controller, the temperature detection unit is used for detecting the temperature of the workpiece fixing groove and the temperature of the workpiece, and the controller is used for adjusting the power and the CO of the high-temperature adjusting unit according to the temperature of the workpiece fixing groove and the temperature of the workpiece2Liquid CO in a cryogenic conditioning unit2Output and input quantities. The invention has the characteristics of simple refrigeration and environment temperature regulation procedures, easy operation and realization of low-temperature regulation function and the like.

Description

High-low temperature device suitable for friction material testing machine
Technical Field
The invention belongs to the field of friction material testing machines, and particularly relates to a high-low temperature device suitable for a friction material testing machine.
Background
The friction material is widely applied to bridge supports and seismic isolation and reduction products, the using environment of the friction material is complex, the friction material comprises tropical and alpine regions, the friction performance of the friction material at high temperature and low temperature is related to the using performance of the bridge supports and seismic isolation and reduction products, and the high-low temperature performance of the friction material has extremely important design and use values in practical use.
The high-low temperature device of the friction material testing machine relates to the high-low temperature performance of bridge supports and seismic isolation and reduction products, and mainly comprises the steps of heating or cooling the test environment temperature to enable a sample to be tested to be in a specified temperature environment, and measuring the friction performance of the sample such as the initial friction coefficient, the average dynamic friction coefficient, the abrasion rate and the like under the specified temperature environment.
At present, a low-temperature device in an existing high-low temperature device mainly provides a cooling source through a refrigerator or a refrigerating bag to cool the temperature of a sample, so that a low-temperature effect is achieved.
Based on the above drawbacks and deficiencies, there is a need in the art to further improve the design of the high and low temperature device in the friction material testing machine to construct an ambient temperature regulated high and low temperature device.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides the high-low temperature device suitable for the friction material testing machine, wherein the high-low temperature device suitable for the friction material testing machine is correspondingly designed by combining the characteristics of the high-low temperature device and the process characteristics of the friction material test, and key components of the high-low temperature device, such as a high-low temperature adjusting module and a vertical adjusting module, are designedThe structures and the specific arrangement modes of the pressurizing module, the horizontal movement module and the control module are researched and designed, and correspondingly, a high-temperature adjusting unit and CO can be adopted according to the temperature setting conditions of the friction test2The temperature of the workpiece fixing groove and the workpiece is adjusted by the cooperation of the low-temperature adjusting unit, so that the workpiece keeps a specified test temperature in the test process, friction performance tests at different speeds and different surface pressures at different temperatures are met, and the device has the characteristics of simple refrigeration and environment temperature adjusting process, easy operation and realization of a low-temperature adjusting function and the like.
In order to achieve the above object, the invention provides a high-low temperature device suitable for a friction material testing machine, which comprises a high-low temperature adjusting module, a vertical pressurizing module, a horizontal movement module and a control module, wherein,
the high-low temperature adjusting module is arranged at the bottom of the vertical pressurizing module and comprises a high-low temperature adjusting outer cover, a workpiece fixing groove arranged at the bottom of the high-low temperature adjusting outer cover, a high-temperature adjusting unit arranged at the top of the workpiece fixing groove and CO2A low temperature conditioning unit, the high temperature conditioning unit and CO2The low-temperature adjusting unit is used for adjusting the temperature of the workpiece fixing groove in a matching manner, so that the workpiece fixed in the workpiece fixing groove keeps a specified test temperature in the test process;
the horizontal movement module is arranged below the workpiece fixing groove and used for providing horizontal friction force of the workpiece in the test process;
the control module comprises a temperature detection unit and a controller, the temperature detection unit is used for detecting the temperatures of the workpiece fixing groove and the workpiece, and the controller is used for adjusting the power and CO of the high-temperature adjusting unit according to the temperatures of the workpiece fixing groove and the workpiece2Liquid CO in a cryogenic conditioning unit2Output and input quantities.
As further preferred, the CO2The low-temperature adjusting unit comprises an upper half shell expansion cavity and a lower half shell expansion cavity which are arranged inside the high-low temperature adjusting outer cover and liquid CO arranged beside the high-low temperature adjusting outer cover2Gas cylinder, said upperHalf shell expansion chamber and half shell expansion chamber down have all seted up the cavity structure, just the one side that the cavity structure was seted up in half shell expansion chamber of the top with the one side fixed connection that the cavity structure was seted up in half shell expansion chamber of the bottom to form CO2An expansion chamber, the liquid CO2The gas cylinder is connected with the CO through a gas inlet pipe2The expansion chambers are connected.
Further preferably, the intake pipe and the CO2Liquid CO is arranged between the expansion cavities2Input valve of the liquid CO2The input valve is fixedly arranged on the high-low temperature adjusting outer cover, and the CO is2The low-temperature adjusting unit also comprises liquid CO arranged on the high-temperature and low-temperature adjusting outer cover2Outlet valve of said liquid CO2One end of the output valve is connected with the CO2The expansion cavities are communicated.
As further preferred, the CO2The low-temperature regulating unit also comprises a liquid CO2The air inlet pipe is wound with a heat preservation belt.
Preferably, a groove for accommodating the high-temperature adjusting unit is formed in the top of the workpiece fixing groove, and holes for embedding the temperature detecting unit are formed in the high-temperature and low-temperature adjusting outer cover and the workpiece fixing groove.
Preferably, the high temperature adjustment unit includes a heating circulator and a return hose, and the heating circulator is connected to the heat pipe joint through the return hose to form a return line.
As a further preferred, the heating circulator includes a plurality of heaters uniformly arranged in a circumferential direction of the groove.
Preferably, the number of the heaters is three, the included angle between adjacent heaters is 120 °, and the power of the heaters is 100W.
Preferably, the high temperature adjusting unit further includes a thermal cut-off for cutting off a power supply of the heating circulator when the temperatures of the workpiece fixing groove and the workpiece exceed a predetermined temperature.
Preferably, a heat insulation plate is arranged at the top of the high-low temperature adjusting outer cover, and the high-low temperature adjusting outer cover is a nylon heat insulation sleeve.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention adopts a high temperature regulating unit and CO2The temperature of the workpiece fixing groove and the workpiece is adjusted through the cooperation of the low-temperature adjusting unit, so that the workpiece keeps the designated test temperature in the test process, the high-temperature and low-temperature setting of the friction material testing machine is realized, the friction performance tests at different speeds and different surface pressures at different temperatures can be met, and the design and the use of the friction performance of the bridge bearing and the seismic isolation reduction and reduction product are of guiding significance.
2. The invention is through the reaction of CO2The intelligent control of the low-temperature adjusting unit enables the temperature of the workpiece fixing groove and the temperature of the workpiece to be rapidly and dynamically adjusted in real time, and the intelligent control of the high temperature and the low temperature of the friction material testing machine is achieved.
3. The invention realizes the heat preservation of the whole device by designing the heat preservation material and the equipment, reduces the loss of heat and improves the efficiency of temperature regulation and control.
4. According to the invention, the high-temperature adjusting unit comprises the heating circulator and the backflow hose, the heating circulator is connected with the heat pipe joint through the backflow hose to form a backflow pipeline, so that the high-efficiency and rapid heating of the workpiece fixing groove and the workpiece can be realized, and the thermal environment of the friction material in the friction process can be simulated.
5. The invention adopts the temperature detector to react sensitively to the environmental temperature (the groove and the workpiece), the set temperature floating temperature can be set according to different standard requirements, and the liquid CO2The pressure is stable (1.6-2.0 Mpa), the temperature setting is quickly responded, the refrigeration and environment temperature regulation processes are simple, and the low-temperature regulation function is easy to operate and realize compared with the traditional low-temperature device.
Drawings
FIG. 1 is a schematic structural diagram of a high and low temperature device suitable for a friction material testing machine according to a preferred embodiment of the present invention;
FIG. 2 is a view of a preferred embodiment of the present invention relating toCO in high-low temperature device suitable for friction material testing machine2The structure schematic diagram of the low-temperature regulating unit;
fig. 3 is a schematic structural diagram of a high temperature adjusting unit in a high and low temperature device suitable for a friction material testing machine according to a preferred embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-vertical actuator, 2-liquid CO2Output valve, 3-high and low temperature regulating outer cover, 4-horizontal actuator, 5-liquid CO2Input valve, 6-reflux hose, 7-sliding platform, 8-liquid CO2The device comprises a gas cylinder, 9-a pressure regulating valve, 10-a gas inlet pipe, 11-a temperature detector, 12-a heater, 13-a thermal breaker, 14-a workpiece fixing groove, 15-a heat-insulating outer cover, 16-a lower half shell expansion cavity, 17-an upper half shell expansion cavity and 18-a heat-insulating plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, 2 and 3, a high-low temperature device suitable for a friction material testing machine according to an embodiment of the present invention includes a high-low temperature adjusting module, a vertical pressurizing module, a horizontal moving module and a control module, wherein the high-low temperature adjusting module is disposed at the bottom of the vertical pressurizing module, and includes a high-low temperature adjusting housing, a workpiece fixing groove 14 disposed at the bottom of the high-low temperature adjusting housing, a high-temperature adjusting unit disposed at the top of the workpiece fixing groove 14, and a CO2A low temperature conditioning unit, the high temperature conditioning unit and CO2The low-temperature adjusting unit is used for adjusting the temperature of the workpiece fixing groove 14 in a matching manner, so that the workpiece fixed on the workpiece fixing groove 14 keeps a specified test temperature in the test process; the horizontal motion module is arranged on the workpiece holderThe fixed groove 14 is used for providing horizontal friction force for the workpiece in the test process; the control module comprises a temperature detection unit and a controller, the temperature detection unit is used for detecting the temperatures of the workpiece fixing groove 14 and the workpiece, and the controller is used for adjusting the power and CO of the high-temperature adjusting unit according to the temperatures of the workpiece fixing groove 14 and the workpiece2Liquid CO in a cryogenic conditioning unit2Output and input quantities. And holes for embedding the temperature detection units are formed in the high-low temperature adjusting outer cover and the workpiece fixing groove 14. In the invention, the controller is a PLC controller.
Specifically, in the invention, the vertical pressurizing module provides vertical pressure for the workpiece under test, and comprises a vertical actuator 1 and a pressing plate arranged at the bottom of the vertical actuator 1. The bottom of the pressure plate is fixedly connected with the high-low temperature adjusting module. The vertical actuator 1 is in communication with the control module for controlling the displacement of the vertical actuator 1 in the vertical direction, in this way with the pressure value applied to the workpiece by the controller. The horizontal motion module is arranged below the high-low temperature adjusting module and comprises a horizontal actuator 4 and a sliding platform 7, wherein the horizontal actuator 4 is fixedly connected with the sliding platform 7, the sliding platform 7 is used for bearing a workpiece, the horizontal actuator 4 is in communication connection with the controller and moves horizontally under the control action of the controller, and therefore the friction environment of the workpiece is simulated in the mode.
As shown in fig. 2, the high-low temperature adjusting module includes a high-low temperature adjusting housing, a workpiece fixing groove 14 formed at the bottom of the high-low temperature adjusting housing, a high-temperature adjusting unit formed between the high-low temperature adjusting housing and the workpiece fixing groove 14, and CO2A low temperature conditioning unit. Wherein, in order to guarantee the controllability, stability and high efficiency of the temperature of the whole device, the high-low temperature adjusting outer cover is made of heat-insulating materials with appointed compressive strength, such as nylon heat-insulating sleeves made of nylon. In order to further improve the temperature loss of the whole device, a heat insulation plate 18 is arranged at the top of the high-low temperature adjusting outer cover, and a heat insulation outer cover 15 is arranged at the bottom of the high-low temperature adjusting outer cover, so that the whole device forms an outer cover with a heat insulation effect. The high and low temperature adjusting outer cover is a structure with a cavity inside and is used for accommodatingCO2CO of a cryogenic conditioning unit2An inflation lumen. More specifically, CO2The low-temperature adjusting unit comprises an upper half shell expansion cavity 17 and a lower half shell expansion cavity 16 which are arranged inside the high-low temperature adjusting outer cover, and liquid CO arranged beside the high-low temperature adjusting outer cover2The gas cylinder 8 is characterized in that the upper half shell expansion cavity 17 and the lower half shell expansion cavity 16 are both provided with cavity structures, and one surface of the upper half shell expansion cavity 17 provided with the cavity structures is fixedly connected with one surface of the lower half shell expansion cavity 16 provided with the cavity structures to form CO2An expansion chamber, the liquid CO2The gas cylinder 8 is connected with the CO through a gas inlet pipe 102The expansion chambers are connected. An inlet pipe 10 and the CO2Liquid CO is arranged between the expansion cavities2Inlet valve 5, the liquid CO2 An input valve 5 is fixedly arranged on the high-low temperature adjusting outer cover, and the CO is2The low-temperature adjusting unit also comprises liquid CO arranged on the high-temperature and low-temperature adjusting outer cover2Outlet valve 2, said liquid CO2One end of the output valve 2 is connected with the CO2The expansion cavities are communicated. In this way, when the temperature of the workpiece fixing groove 14 and the workpiece is higher than the temperature set in the friction test, the control module controls the pressure of the pressure regulating valve 9 according to the temperature measured by the temperature detecting unit, thereby controlling the input CO2Liquid CO in expansion chamber2Flow of, liquid CO2In CO2The expansion chamber absorbs heat to expand from liquid CO2The output valve flows out and takes away the temperature of the workpiece fixing groove 14 and the workpiece, so as to rapidly reduce the temperature of the workpiece fixing groove 14 and the workpiece.
In the present invention, the control module adjusts the liquid CO according to the temperature of the workpiece-holding slot 14 and the workpiece2So that the temperature of the workpiece fixing groove 14 and the workpiece is maintained within a stable temperature range, and in this way, errors due to heat generated by the workpiece during the friction test are overcome. Meanwhile, the feedback regulation mode can reduce the calculated amount of the control module, namely, the temperature is regulated according to one variable in the temperature regulation process.
In a preferred embodiment of the present invention, the air inlet pipe 10 is wrapped with a heat insulating tape.
As shown in fig. 3, the top surface of the workpiece fixing groove 14 is provided with a groove for accommodating the high temperature adjusting unit, and the high temperature adjusting unit includes a heating circulator and a return hose, and the heating circulator is connected to the heat pipe joint 6 through the return hose to form a return line. The heating circulator includes a plurality of heaters 12 uniformly arranged along the circumferential direction of the groove. The number of the heaters 12 is three, the included angle between adjacent heaters 12 is 120 °, and the power of the heaters 12 is 100W. The high temperature adjusting unit further comprises a thermal cut-out 13, and the thermal cut-out 13 is used for cutting off the power supply of the heating circulator when the temperatures of the workpiece fixing groove 14 and the workpiece exceed a specified temperature.
The working process of the high-low temperature device suitable for the friction material testing machine comprises the following steps:
the workpiece to be tested is cut into a shape corresponding to the workpiece fixing groove 14, and the workpiece is placed in the workpiece fixing groove 14.
The controller drives the vertical actuator 1 to move downwards until the pressure value applied to the workpiece by the workpiece fixing groove 14 is a set pressure value according to the requirements of the friction test.
The heater 12 is turned on to heat the workpiece fixing groove 14 and the workpiece, so that the workpiece fixing groove 14 and the workpiece reach a set high temperature, and the workpiece fixing groove 14 and the workpiece are maintained at the set height value, wherein the workpiece fixing groove 14 and the workpiece are maintained at 80 ℃ in the invention. Then the controller controls the horizontal actuator 4 to move horizontally, the controller drives the sliding platform 7 to move horizontally, so as to simulate the friction motion environment of the workpiece, in the experiment process, the temperature detector 11 measures the temperature values of the workpiece fixing groove 14 and the workpiece in real time, the measured temperature values are sent to the controller in real time, when the temperatures of the workpiece fixing groove 14 and the workpiece are lower than the temperature set in the experiment, the heater 12 is continuously adopted to heat the workpiece fixing groove 14 and the workpiece, and when the temperatures of the workpiece fixing groove 14 and the workpiece are higher than the temperature set in the experiment, the pressure value of the pressure regulating valve 9 is adjusted according to the difference between the measured temperature and the temperature set in the experiment, so that the liquid CO can be used as a fuel2Liquid CO in gas cylinders2From liquid CO2Input valve 5Into CO2Expansion chamber, liquid CO2Heat is absorbed in the expansion chamber to lower the temperature of the workpiece holding recess 14 and the workpiece, and the absorbed CO2By liquid CO2The outlet valve 2 flows out, in this way, through the high temperature regulating unit and the CO2The low-temperature adjusting unit is used for adjusting the temperature of the workpiece fixing groove 14 in a matching manner, so that the workpiece fixed on the workpiece fixing groove 14 keeps a specified test temperature in the test process. The controller then controls the liquid CO2 The inlet valve 5 is closed.
In the present invention, the temperature probe is a PT100 temperature probe. Wherein two PT100 temperature detectors are provided, one being provided on the workpiece-fixing groove 14 for detecting the temperature of the workpiece, and the other being provided on the lower half-shell expansion chamber 16 for detecting the temperature of the workpiece-fixing groove 14.
The invention measures the temperature of the groove and the workpiece through the temperature sensor PT100 temperature detector and through liquid CO2The temperature of a groove and a workpiece in the friction material testing machine is adjusted by opening and closing the input valve, the high and low temperature setting of the friction material testing machine is realized, the friction performance test at different temperatures and different speeds and different surface pressures can be met, and the design and the use of the friction performance of the bridge bearing and the seismic isolation reduction and reduction product are of guiding significance. Meanwhile, the temperature sensor PT100 temperature detector is sensitive to the ambient temperature (grooves and workpieces), the set temperature floating temperature can be set according to different standard requirements, and in the invention, liquid CO is used2The pressure value of (A) is 1.6-2.0 Mpa, and liquid CO2The pressure stabilization quick response cooling setting is compared in traditional low temperature device, and refrigeration and ambient temperature regulation process are simple, and the low temperature regulatory function is easy to operate, easily realize.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A high-low temperature device suitable for a friction material testing machine is characterized by comprising a high-low temperature adjusting module, a vertical pressurizing module, a horizontal movement module and a control module, wherein,
the high-low temperature adjusting module is arranged at the bottom of the vertical pressurizing module and comprises a high-low temperature adjusting outer cover, a workpiece fixing groove (14) arranged at the bottom of the high-low temperature adjusting outer cover, a high-temperature adjusting unit arranged between the high-low temperature adjusting outer cover and the workpiece fixing groove (14) and CO2A low temperature conditioning unit, the high temperature conditioning unit and CO2The low-temperature adjusting unit is used for adjusting the temperature of the workpiece fixing groove (14) in a matching manner, so that the workpiece fixed on the workpiece fixing groove (14) keeps a specified test temperature in the test process;
the horizontal movement module is arranged below the workpiece fixing groove (14) and used for providing horizontal friction force of the workpiece in the test process;
the control module comprises a temperature detection unit and a controller, the temperature detection unit is used for detecting the temperatures of the workpiece fixing groove (14) and the workpiece, and the controller is used for adjusting the power and CO of the high-temperature adjusting unit according to the temperatures of the workpiece fixing groove (14) and the workpiece2Liquid CO in a cryogenic conditioning unit2Output and input quantities.
2. The high and low temperature device for friction material testing machine according to claim 1, wherein said CO is selected from the group consisting of2The low-temperature adjusting unit comprises an upper half shell expansion cavity (17) and a lower half shell expansion cavity (16) which are arranged inside the high-low temperature adjusting outer cover and liquid CO arranged beside the high-low temperature adjusting outer cover2The gas cylinder (8), cavity structures have all been seted up in half upper shell expansion chamber (17) and half lower shell expansion chamber (16), just the one side that cavity structures was seted up in half upper shell expansion chamber (17) with the one side fixed connection that cavity structures was seted up in half lower shell expansion chamber (16) to form CO2An expansion chamber, the liquid CO2The gas cylinder (8) is connected with the CO through a gas inlet pipe (10)2The expansion chambers are connected.
3. According to the claims2A high and low temperature device suitable for friction material testing machine, characterized in that, the intake pipe (10) with CO2Liquid CO is arranged between the expansion cavities2An inlet valve (5), the liquid CO2An input valve (5) is fixedly arranged on the high-low temperature adjusting outer cover, and CO is2The low-temperature adjusting unit also comprises liquid CO arranged on the high-temperature and low-temperature adjusting outer cover2Outlet valve (2), the liquid CO2One end of the output valve (2) is connected with the CO2The expansion cavities are communicated.
4. The high and low temperature device suitable for friction material testing machine of claim 2, wherein the CO is selected from the group consisting of2The low-temperature regulating unit also comprises a liquid CO2The pressure regulating valve (9) is arranged between the gas cylinder (8) and the gas inlet pipe (10), and the gas inlet pipe (10) is wound with a heat preservation belt.
5. The high-low temperature device suitable for the friction material testing machine according to claim 1, wherein a groove for accommodating the high-temperature adjusting unit is formed at the top of the workpiece fixing groove (14), and holes for embedding the temperature detecting unit are formed in the high-low temperature adjusting cover and the workpiece fixing groove (14).
6. A high and low temperature device suitable for a friction material testing machine according to claim 5, wherein the high temperature adjusting unit comprises a heating circulator and a return hose, and the heating circulator is connected with the heat pipe connector (6) through the return hose to form a return pipeline.
7. A high and low temperature device suitable for a friction material testing machine according to claim 6, wherein the heating circulator comprises a plurality of heaters (12) uniformly arranged along the circumferential direction of the groove.
8. The high and low temperature device suitable for the friction material testing machine is characterized in that the number of the heaters (12) is three, the included angle between the adjacent heaters (12) is 120 degrees, and the power of the heaters (12) is 100W.
9. The high and low temperature apparatus for a friction material testing machine according to claim 6, wherein the high temperature adjusting unit further comprises a thermal cut-out (13), the thermal cut-out (13) is used for cutting off the power supply of the heating circulator when the temperature of the workpiece fixing groove (14) and the workpiece exceeds a specified temperature.
10. The high-low temperature device suitable for the friction material testing machine is characterized in that a heat insulation plate (18) is arranged at the top of the high-low temperature adjusting outer cover, and the high-low temperature adjusting outer cover is a nylon heat insulation sleeve.
CN202010842942.XA 2020-08-20 2020-08-20 High-low temperature device suitable for friction material testing machine Pending CN111948021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010842942.XA CN111948021A (en) 2020-08-20 2020-08-20 High-low temperature device suitable for friction material testing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010842942.XA CN111948021A (en) 2020-08-20 2020-08-20 High-low temperature device suitable for friction material testing machine

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Publication Number Publication Date
CN111948021A true CN111948021A (en) 2020-11-17

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CN202010842942.XA Pending CN111948021A (en) 2020-08-20 2020-08-20 High-low temperature device suitable for friction material testing machine

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