CN107907559B - Testing device for gasket of automobile exhaust catalyst - Google Patents
Testing device for gasket of automobile exhaust catalyst Download PDFInfo
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- CN107907559B CN107907559B CN201711113692.0A CN201711113692A CN107907559B CN 107907559 B CN107907559 B CN 107907559B CN 201711113692 A CN201711113692 A CN 201711113692A CN 107907559 B CN107907559 B CN 107907559B
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- clamping block
- heating clamping
- gasket
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
- G01N25/4846—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a motionless, e.g. solid sample
Abstract
The invention relates to a testing device for a gasket of an automobile exhaust catalyst, wherein a push rod is vertically arranged on a base, a first force sensor is arranged between the push rod and the base, a lower heating clamping block is arranged at the end part of the push rod, an upper heating clamping block is arranged above the lower heating clamping block, a first servo motor is connected with the upper heating clamping block and can control the upper heating clamping block to move up and down relative to the lower heating clamping block, and a temperature control system comprises a heating device, an air cooling device and a temperature sensor which are arranged on the upper heating clamping block and the lower heating clamping block. The invention has simple structure, compact design and convenient use, can accurately control the temperature of the gasket test piece and the thickness of the packaging clearance to simulate the performance of the gasket under various working conditions according to different test requirements, can be used for testing various performances of the gasket, including surface pressure, aging durability and friction coefficient, saves the test time and reduces the test cost.
Description
Technical Field
The invention relates to a testing device for a gasket of an automobile exhaust catalyst, and belongs to the technical field of detection devices.
Background
Along with the reduction of automobile price and the improvement of consumption environment, the automobile market in China keeps the annual growth rate of more than 10 percent, however, the automobile brings convenience to the society and also brings a heavy problem of automobile exhaust emission pollution. Solving the problem of the harm of automobile emission to environmental pollution has become one of the important issues of research for many years by various automobile manufacturers in the world. One of the important measures, pollution control device, is to remove the impurities in the tail gas by a honeycomb ceramic carrier containing a Pb and other noble metal coatingConversion of harmful gases to harmless CO2、N2And H2And O, effectively controlling the automobile exhaust emission.
As a core element of a pollution control device, a honeycomb ceramic carrier is generally extremely thin in wall thickness and is easily damaged by impact and vibration. Violent damage during assembly, engine vibration and jolt during driving can cause damage to the honeycomb ceramic carrier, rendering the pollution control device ineffective. In order to ensure the life of the pollution control device using the honeycomb ceramic carrier, it is necessary to protect the fragile honeycomb ceramic carrier with a buffer material.
The liner serves as a good cushioning layer for the pollution control device and comprises primarily fibers, binder and intumescent material. The liner is arranged between the metal shell and the honeycomb ceramic carrier and is coated outside the honeycomb ceramic carrier. Because the expansion material is contained, the thickness of the gasket can be continuously increased along with the rise of the environmental temperature, thereby well compensating the difference of the thermal expansion coefficients between the metal shell and the honeycomb ceramic carrier, providing enough sealing retaining force, simultaneously playing the roles of heat insulation and shock absorption and being an important part for ensuring the service life and the safe work of the pollution control device.
In view of the important role of the gasket, it is very important to conduct experimental research thereon. The gasket is required to provide sufficient retention to secure the honeycomb ceramic carrier and not so great as to cause the carrier to fracture; the corrosion resistance to severe working environment and tail gas is good; the liner must also have a good stable structure over its aging life; since the temperature variation of the exhaust gas of an automobile is large, and the temperature at high temperature may exceed 800 ℃, the gasket must have high temperature resistance.
At present, performance test equipment of the gasket is abnormally lagged, and the gasket meeting the conditions needs to be used according to different working conditions, but the reliability of the gasket cannot be effectively verified at present. Due to the lack of necessary performance testing equipment, the evaluation of existing products and the launching of new products by enterprises are severely affected.
Disclosure of Invention
The invention aims to solve the problems and provides a testing device for a gasket of an automobile exhaust catalyst, which has a simple structure and a compact design.
The invention adopts the following technical scheme: a testing device for a gasket of an automobile exhaust catalyst comprises a first servo motor, a second servo motor, an upper heating clamping block, a lower heating clamping block, a connecting plate, a push rod, a base, a first force sensor, a second force sensor, a temperature control system and a data analysis system;
the push rod is vertically arranged on the base, a first force sensor is arranged between the push rod and the base, a lower heating clamping block is arranged at the end part of the push rod, an upper heating clamping block is arranged above the lower heating clamping block, the first servo motor is connected with the upper heating clamping block, the first servo motor can control the upper heating clamping block to move up and down relative to the lower heating clamping block, the connecting plate is connected with a second servo motor, a second force sensor is arranged between the connecting plate and the second servo motor, and the second servo motor can drive the connecting plate to move horizontally relative to the upper heating clamping block and the lower heating clamping block;
the data analysis system can acquire data of the first force sensor and the second force sensor, temperature data in the temperature control system and speed data in the first servo motor and the second servo motor.
Furthermore, the upper heating clamping block and the lower heating clamping block are both made of quartz glass.
Further, the temperature sensor can be used for monitoring the temperature of the upper heating clamping block and the lower heating clamping block. The temperature control system comprises a heating device, an air cooling device and a temperature sensor, wherein the heating device is arranged on the upper heating clamping block and the lower heating clamping block.
The invention has simple structure, compact design and convenient use, can accurately control the temperature of the gasket test piece and the thickness of the packaging clearance to simulate the performance of the gasket under various working conditions according to different test requirements, can be used for testing various performances of the gasket, including surface pressure, aging durability and friction coefficient, saves the test time and reduces the test cost.
Drawings
Fig. 1 is an assembly diagram of the present invention in a surface pressure test and a durability test.
FIG. 2 is a schematic view of the friction coefficient test assembly of the present invention.
Fig. 3 is a schematic view showing the mounting position of the mat in the catalyst carrier.
Reference numerals: the device comprises a first servo motor 1, a second servo motor 2, an upper heating clamping block 3, a lower heating clamping block 4, a connecting plate 5, a push rod 6, a base 7, a first force sensor 8, a second force sensor 9, a temperature control system 10, a data analysis system 11, a gasket 12, a metal shell 13 and a honeycomb ceramic carrier 14.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A testing device for a gasket of an automobile exhaust catalyst comprises a first servo motor 1, a second servo motor 2, an upper heating clamping block 3, a lower heating clamping block 4, a connecting plate 5, a push rod 6, a base 7, a first force sensor 8, a second force sensor 9, a temperature control system 10 and a data analysis system 11;
the push rod 6 is vertically arranged on the base 7, a first force sensor 8 is arranged between the push rod 6 and the base 7, the end part of the push rod 6 is provided with a lower heating clamping block 4, an upper heating clamping block 3 is arranged above the lower heating clamping block 4, the upper heating clamping block 3 and the lower heating clamping block 4 are both made of quartz glass, a first servo motor 1 is connected with the upper heating clamping block 3, the first servo motor 1 can control the upper heating clamping block 3 to move up and down relative to the lower heating clamping block 4, a temperature control system 10 comprises heating devices arranged on the upper heating clamping block 3 and the lower heating clamping block 4, an air cooling device and a temperature sensor, a connecting plate 5 is connected with a second servo motor 2, a second force sensor 9 is arranged between the connecting plate 5 and the second servo motor 2, and the second servo motor 2 can drive the connecting plate to move relative to the upper heating clamping block 3, the lower heating clamp block 4 moves horizontally; the data analysis system 11 can acquire data of the first force sensor 8 and the second force sensor 9, temperature data in the temperature control system 10 and speed data in the first servo motor 1 and the second servo motor 2, and the temperature sensors can be used for monitoring the temperatures of the upper heating clamp block and the lower heating clamp block.
As shown in fig. 3, the gasket 12 is installed between the metal shell 13 and the ceramic honeycomb carrier 14, and the thickness of the gasket 12 after assembly is about 65% of the thickness before assembly in order to ensure sufficient holding force when it is packed into the pollution control device. If the compressive force of the assembly is too great, the ceramic carrier may be crushed and therefore the mat 12 may need to be tested for surface pressure prior to installation to assess whether the mat is properly selected.
The working method comprises the following steps:
1. surface pressure test:
as shown in fig. 1, a sample to be tested of a gasket 12 with the size of 5cm × 5cm is placed on a lower heating clamp block 4, an upper heating clamp block 3 is controlled by a first servo motor 1 to compress the gasket to a required thickness (a packaging gap between a metal shell and a honeycomb ceramic carrier), a first force sensor 8 measures the packaging pressure, and a data analysis system calculates the packaging surface pressure of the gasket under different packaging conditions;
because the gasket 12 is filled between the metal shell 13 and the honeycomb ceramic carrier 14, the expansion of the gasket 12 is limited by the metal shell 13 and the honeycomb ceramic carrier 14 in the whole high-temperature expansion process, the expansion force of the gasket 12 can generate large surface pressure, and the thickness of the gasket between the two under the actual working condition can be obtained through the thermal expansion coefficients and the size calculation of the two.
In order to simulate the temperature change condition of the liner 12 in the actual working process, the upper heating clamping block 3 heats the upper side and the lower side of the liner 12 to the required working temperature respectively through the temperature control system within ten minutes (respectively corresponding to the temperature between the liner and the metal shell and the temperature between the liner and the honeycomb ceramic carrier in the actual exhaust emission process, and accumulated through actual measurement experience), and the data analysis system 11 can obtain the surface pressure change curve of the liner 12 under different working temperature conditions according to the feedback data of the first force sensor 8.
By testing the obtained surface pressure data of the gasket 12, whether the compressive force of the selected gasket exceeds the strength limit borne by the honeycomb ceramic carrier can be judged, the honeycomb ceramic carrier crushing phenomenon is avoided, and a basis is provided for the evaluation of the gasket.
2. And (3) durability test:
the gasket 12 is installed between the metal shell 13 and the honeycomb ceramic carrier 14, and under the high-temperature exhaust emission condition, the gap between the metal shell 13 and the honeycomb ceramic carrier 14 is increased due to the difference of the thermal expansion coefficients, and meanwhile, the gasket 12 is heated to expand to make up the gap. When the pollution control device stops operating, cooling causes the gap between the two to recover and the gasket to compress. The test set-up for the pad in the pollution control device is a process that quickly simulates such an expansion-compression-expansion cycle. The retention after aging was determined by a pad aging durability test to assess whether the pad can meet the life requirements of the pollution control device.
As shown in fig. 1, a test sample piece of a gasket 12 with the size of 5cm × 5cm is placed on a lower heating clamping block 4, the upper heating clamping block 3 is controlled by a first servo motor 1 program to compress the gasket to a required packaging thickness, the temperature of two sides of the gasket is controlled by a temperature control system 10, the gasket is heated to an actual working condition temperature within ten minutes, and a gap of an upper heating clamping block is opened to the thickness of the gap of the gasket under the actual working condition while heating. And continuously circulating compression-release-compression by controlling the change of the clearance, ending after 1000 times of circulation, finally obtaining the residual packaging surface pressure after the rapid aging process of the gasket by a data analysis system, and obtaining the retention force after the aging according to the friction coefficient. And calculating the thrust force formed by the exhaust back pressure and the vibration acceleration to confirm whether the gasket can provide enough holding force for the honeycomb ceramic carrier.
3. And (3) testing the friction coefficient:
as shown in fig. 2: the second servo motor 2, the second force sensor 9 and the connecting plate 5 form a friction coefficient testing tool to simulate and test the friction coefficient between the gasket and the metal shell.
During the experiment, two pad test samples are placed between the upper heating clamping block 3 and the lower heating clamping block 4, and the connecting plate 5 is placed between the two pad samples. The upper heating clamping block 3 is controlled by the first servo motor 1 to compress the gasket to the required thickness, the temperature control system 10 controls the upper heating clamping block 3 and the lower heating clamping block 4 to be heated to the actual working condition temperature, the second force sensor 9 feeds back the normal force and the friction force of the gasket to be measured in real time, the temperature-time change curve and the friction force-normal pressure change curve recorded by the data analysis system are obtained, and finally the friction coefficients between the gasket and the connecting plate at different temperatures are obtained through calculation.
Claims (3)
1. A testing device for a gasket of an automobile exhaust catalyst is characterized in that: the device comprises a first servo motor (1), a second servo motor (2), an upper heating clamping block (3), a lower heating clamping block (4), a connecting plate (5), a push rod (6), a base (7), a first force sensor (8), a second force sensor (9), a temperature control system (10) and a data analysis system (11);
the push rod (6) is vertically arranged on the base (7), a first force sensor (8) is arranged between the push rod (6) and the base (7), a lower heating clamping block (4) is arranged at the end part of the push rod (6), an upper heating clamping block (3) is arranged above the lower heating clamping block (4), the first servo motor (1) is connected with the upper heating clamping block (3), and the first servo motor (1) can control the upper heating clamping block (3) to move up and down relative to the lower heating clamping block (4); the connecting plate (5) is connected with the second servo motor (2), a second force sensor (9) is arranged between the connecting plate (5) and the second servo motor (2), and the second servo motor (2) can drive the connecting plate (5) to horizontally move relative to the upper heating clamping block (3) and the lower heating clamping block (4); the data analysis system (11) can acquire data of the first force sensor (8) and the second force sensor (9), temperature data in the temperature control system (10) and speed data in the first servo motor (1) and the second servo motor (2);
placing a sample piece to be tested of the gasket (12) on the lower heating clamping block (4), controlling the upper heating clamping block (3) to compress the gasket (12) to a required thickness through the first servo motor (1), measuring the packaging pressure through the first force sensor (8), and calculating the packaging surface pressure of the gasket (12) under different packaging conditions through the data analysis system (11);
placing a test sample piece of the gasket (12) on a lower heating clamping block (4), controlling an upper heating clamping block (3) to compress the gasket to a required packaging thickness through a first servo motor (1) program, controlling the temperature of two sides of the gasket (12) through a temperature control system (10), heating to the actual working condition temperature within ten minutes, opening the gap of the upper heating clamping block (3) to the thickness of the liner gap under the actual working condition while heating, through controlling the continuous cycle of gap change compression-release-compression, the cycle is finished after 1000 times, finally the residual packaging surface pressure after the rapid aging process of the gasket (12) is obtained by a data analysis system (11), the retention force after the aging is obtained according to the friction coefficient, the thrust formed by the exhaust back pressure and the vibration acceleration is calculated, and whether the gasket (12) can provide enough retention force for the honeycomb ceramic carrier is determined;
two pad (12) test samples are placed between an upper heating clamping block (3) and a lower heating clamping block (4), a connecting plate (5) is placed between the two pad (12) samples, the upper heating clamping block (3) is controlled to compress a pad to a required thickness through a first servo motor (1), a temperature control system (10) controls the upper heating clamping block (3) and the lower heating clamping block (4) to be heated to an actual working condition temperature, a second force sensor (9) feeds back and measures the normal force and the friction force of the pad (12) in real time, a temperature-time change curve recorded by a data analysis system (11), a friction force-normal pressure change curve, and finally the friction coefficient between the pad (12) and the connecting plate (5) at different temperatures is calculated.
2. The test device for a gasket for an automobile exhaust catalyst according to claim 1, wherein: the upper heating clamping block (3) and the lower heating clamping block (4) are both made of quartz glass.
3. The test device for a gasket for an automobile exhaust catalyst according to claim 1, wherein: the temperature control system (10) comprises a heating device, an air cooling device and a temperature sensor, wherein the heating device is arranged on the upper heating clamping block (3) and the lower heating clamping block (4), and the temperature sensor can be used for monitoring the temperature of the upper heating clamping block (3) and the lower heating clamping block (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711113692.0A CN107907559B (en) | 2017-11-13 | 2017-11-13 | Testing device for gasket of automobile exhaust catalyst |
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| CN201711113692.0A CN107907559B (en) | 2017-11-13 | 2017-11-13 | Testing device for gasket of automobile exhaust catalyst |
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| CN107907559B true CN107907559B (en) | 2020-10-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110411720A (en) * | 2019-07-16 | 2019-11-05 | 苏州中汽检测技术服务有限公司 | The detection device and detection method of carrier reliability in vehicle-exhaust exhaust pipe |
| CN111577432B (en) * | 2020-05-12 | 2021-11-19 | 北京汽车集团越野车有限公司 | Engine, catalyst packaging method thereof and automobile |
| CN114296493B (en) * | 2022-03-11 | 2022-08-09 | 杭州长川智能制造有限公司 | Chip temperature adjusting method |
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