CN111272573A

CN111272573A - Multi-head creep endurance testing machine

Info

Publication number: CN111272573A
Application number: CN201910820988.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Yu Zhongjiu
Current assignee: Yu Zhongjiu
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-06-12

Abstract

The invention discloses a multi-head creep endurance testing machine, and belongs to special equipment in the technical field of testing machines. The three sets of stretching devices which are independently controlled and do not interfere with each other are arranged, a set of tests can be completed at one time under the same test conditions, the traditional testing machine is replaced, only one test can be performed at one time, the production efficiency is improved, and the cost is reduced. During testing, a group of samples are located in a constant temperature area, influence factors are fixed, analysis of test results is facilitated, and quality is improved. And the thermocouple is not bound by using an asbestos rope during the test, so that the test is beneficial to environmental protection and has no pollution. Only one heating furnace is used as a direct radiation type, so that the reaction is sensitive and the speed is high. The length of the constant temperature area is 100-300mm, and the temperature range is 100-1400 ℃. When creep test is carried out, an extension rod and a displacement sensor are arranged on a sample gauge length, and when the sample is stressed and changed, signals of the sensors are input into a data acquisition system AWS, and a result is printed by computer processing.

Description

Multi-head creep endurance testing machine

The technical field is as follows:

a multi-head creep endurance testing machine belongs to special equipment in the technical field of testing machines. The tester is suitable for testing various mechanical property parameters of the metal material under the conditions of room temperature and high temperature.

Background art:

at present, a lasting creep testing machine produced at home and abroad only has one set of stretching device and one heating furnace, one test can be carried out at one time, the production efficiency is low, the cost is high, a group of tests need to be repeated three times, the influence factors are many, the analysis of test results is not facilitated, and the improvement of test quality is influenced.

The existing multi-head creep endurance testing machine has differences, equipment is added during testing, and one group of tests cannot be completed in the same furnace, so that the testing cost is high, the testing quality is poor, and the environment is not influenced by environmental pollution due to the fact that asbestos ropes are used for binding thermocouples during testing.

The invention content is as follows:

according to the existing problems, the multi-head creep endurance testing machine with three sets of stretching devices is invented. One set of tests (three specimens) can be completed at a time under the same test conditions. A group of samples are positioned in a constant temperature area, and three thermocouples are used for monitoring the upper temperature, the middle temperature and the lower temperature of the constant temperature area, so that the influence factors are the same, and the improvement of the test quality is facilitated. The whole test process does not use asbestos ropes, and is pollution-free and environment-friendly.

The machine consists of five parts as shown in figure 1-A and figure 1-B

1. Three servo systems are arranged on a beam of the main machine

2. Heating furnace, artificial intelligence temperature control system, thermocouple

3. A clamp: plate shape and circular shape

4. Recording system, displacement sensor, force transducer, AWS system, computer

5. Extension rod and displacement sensor

The technical proposal for solving the technical problem is that

1. According to the principle of 'one machine and one furnace once', the creep endurance testing machine with three sets of stretching devices completes one set of tests (three samples) at a time under the same conditions, and replaces the traditional creep endurance testing machine. The specific method comprises the following steps: three servo systems are respectively fixed at the center of a cross beam of the tester at intervals of 120 degrees and radius of 25mm and connected with respective universal joints, and the upper and lower positions of the universal joints are controlled. Three force sensors and a balance rod are also fixed on the base and correspond to the universal joint on the base, so that three sets of stretching devices of a servo system, the universal joint, an upper pull rod, a sample, a lower pull rod, the force sensors and the balance rod are formed, and the traditional equipment is replaced. The test is carried out in a constant temperature area, so that the production efficiency is improved, the cost is reduced, and the quality is improved. When the force is applied, the sample is extended, the balance rod moves downwards, and the balance is broken. The corresponding servo system starts to work, adjusts the balance to reach a new balance and is always in a zero state.

2. The heating furnace is a key device for testing and is fixed on the stand column of the testing machine by a supporting plate. The direct radiation type heating mode heats the sample, the sensitivity is high, the temperature range is 1400 ℃ in 100-. The problem can be solved by only programming the temperature control program. After 30 minutes of constant temperature, the test can be carried out until the temperature is kept constant after the test is finished.

3. The whole fixture of the testing machine can be used for plate test with the thickness less than or equal to 2.0mm and the gauge length of 25 mm. The diameter of the round sample is 5.0mm, and the gauge length is 25 mm. During creep test, an extension rod and a displacement sensor are arranged on a sample gauge length. And the extension rod selects a corresponding chuck according to the shape of the sample and is fixed with the sample scale distance. The combination of 6-1a, 6-2b and 6-3c in FIG. 6 is selected for the round test piece, and 6-4a in FIG. 6 is selected for the plate test piece₁、6-5b₁、6-6c₁And (4) combining. The displacement sensor is a differential transformer resistance strain gauge or other displacement sensors, and only the method accords with the national standard GB metal material high-temperature tensile creep test method.

4. When the sample is deformed, the force transducer and the displacement transducer have signals to the data acquisition system AWS, and the test result report is processed and printed by the computer.

The invention has the beneficial effects on the prior art

Because three sets of stretching devices and one heating furnace are selected, the production efficiency is improved by 200 percent, the test cost is reduced by 200 percent, the test quality is improved, and the device is environment-friendly, time-saving, labor-saving and material-saving.

The whole structure design is compact, and the use is convenient. The up and down movement of the beam is accomplished by the servo system of the machine itself. The temperature control system only uses one fixture, the connection between the fixtures is mainly fixed, and only two ends of the round sample are threaded. The fixture is processed by structural steel below 500 ℃ and heat-resistant alloy above 500 ℃. The extension rod is processed by heat-resistant alloy. Finished products can be selected for each sensor, and the precision is greater than or equal to one thousandth.

Drawings

FIG. 1, general assembly schematic view 1-A without extension bar FIG. 1-B with extension bar

1-0 servo system

1-1. the upper beam is provided with three servo systems

1-2. dowel

1-3. Universal joint

1-4 upper pull rod

1-5. heating body

1-6 thermocouple jack

1-7. test piece

1-8 heating furnace

1-9 extending rod

1-10. displacement transmission rod device

1-11. lower pull rod

1-12. joint

1-13 force transducer

1-14 weight

1-15. base

1-16 operating board (Artificial intelligence temperature controller, AWS system, computer)

FIG. 2 shows a universal joint

2-1. joint

2-2. dowel

2-3. draw bar

2-4. dowel

FIG. 3 force sensor

3-1. lower pull rod

3-2. force transducer

3-3. weight

3-4. balance bar

3-5. base

FIG. 4 is a schematic view of the assembly of a creep test extension bar

4-1. heating furnace

4-2 thermocouple hole

4-3. upper pull rod

4-4. chuck

4-5. bolt

4-6. test piece

4-7. bolt

4-8 lower pull rod

4-9. supporting plate

4-10 fine adjustment nut

4-11. displacement sensor

4-12. operation table

4-13. inner extension rod

4-14. external extension rod

4-15. chuck

4-16 fastening bolt

FIG. 5, the joint

FIG. 6 is an assembly view of the extension rod

6-1. upper round chuck a

6-2. circular chuck assembly drawing b

6-3. circular chuck c

6-4. upper plate-shaped chuck a₁

6-5. plate-shaped chuck Assembly drawing b₁

6-6. plate-shaped clamp c1

6-7. lower round chuck

6-8. lower plate clamp head

6-9 bolt

6-10. inner extension rod

6-11. external extension rod

6-12 fine adjustment nut

6-13 displacement sensor

6-14 bolt

FIG. 7 shows a load cell

7-1. force transducer

7-2 plug

FIG. 8, a pallet

8-1. bolt

8-2. splint

8-3. upright column

8-4. supporting plate

Detailed Description

With reference to FIG. 1-A and FIG. 1-B, the multi-head drawing schematic diagram is composed of a servo system 1-0 of a host, a beam 1-1, a pin 1-2, a universal joint 1-3, an upper pull rod 1-4, a heating body 1-5, a thermocouple jack 1-6, a sample 1-7, a heating furnace 1-8, a stretching rod 1-9, a displacement sensor 1-10, a lower pull rod 1-11, a joint 1-12, a force transducer 1-13, a weight 1-14, a base 1-15, and a console (an artificial intelligent temperature controller, a data acquisition system AWS and a computer 1-16.)

Three servo systems are fixed at the center positions of the cross beam of the testing machine at intervals of 120 degrees and radius of 25mm at intervals of 1-A and 1-B for adjusting the upper position and the lower position, and the universal joint is processed by high-strength alloy. Similarly, three force sensors are fixed on the test machine base at 1-15 in fig. 1, and fig. 3 corresponds to the universal joint mutually to form three sets of stretching devices, namely:

universal joint figure 2+ tie rod figure 7+ sample + tie rod figure 7+ load cell figure 3. The universal joint with the temperature below 500 ℃ is processed by structural steel and the universal joint with the temperature above 500 ℃ is processed by high-temperature alloy.

The heating furnace is a key device for the test, the heating furnace is fixed on a furnace frame guide rail and can move back and forth, the size is determined by a selected host, the shell of the heating furnace is processed by a stainless steel plate, the thickness is 0.5-1.0 mm, the heat-insulating layer is made of light refractory bricks, the furnace tube is made of a high-alumina tube, the heating body is made of iron-chromium-aluminum wires, the diameter is 1.0mm, a direct radiation type heating mode is adopted, the sensitivity is high, the temperature range is 1400 ℃ at 100 plus, the constant temperature area is 300mm, three thermocouples are inserted into the furnace from ①②③ three holes in the graphs 1-A and 1-B to monitor the temperature change above, in the middle and below the constant temperature area, an artificial intelligent temperature controller is input to adjust the temperature control precision to be less than or equal to 0.5 ℃, the final printing result is processed by an AWS computer, and the.

In the micro deformation test, the extension rod 1-9 is arranged on the sample gauge length and extends out of the furnace by about 200 mm. The tail end of the extension rod is provided with a displacement transmission rod connector which is connected with an AWS system, and the extension result is processed by a computer. The extension rod is processed by high-temperature alloy. The precision of the displacement sensor is less than or equal to one thousandth. And (4) carrying out a micro-deformation test, and fixing the extension rod with the chuck and the sample scale distance according to the shape of the sample. The round sample was selected from the group consisting of 6-1a, 6-2b and 6-3c in FIG. 6. Plate shape sample selection 6-4a in FIG. 6₁、6-5b₁、6-6c₁And (4) combining.

Claims

1. The multi-head creep endurance testing machine is a special device belonging to the technical field of metal testing machines, and is provided with three sets of independent and non-interfering stretching devices, including a servo system 1-0, a universal joint 1-3, upper and lower pull rods 1-3, 1-11, a force measuring sensor 1-12, weights 1-14, a stretching rod 1-9, a displacement sensor 1-10, a heating furnace 1-5, and a console (an artificial intelligent temperature controller, a data acquisition system AWS and a computer) 1-16.

2. The multi-head creep endurance testing machine according to claim 1, wherein: three servo systems are respectively fixed at the center of a cross beam of the testing machine every 120 degrees and radius of 25mm and connected with three universal joints for adjusting the center sensitivity, and an upper pull rod, a test sample, a lower pull rod and force sensors which are independent are connected, the three force sensors are fixed on a base and correspond to the universal joints mutually to form three sets of stretching devices, and the balance rods are adjusted by the respective servo systems to be in a zero state when the three sets of stretching devices move up and down.

3. The multi-head creep endurance testing machine according to claim 1, wherein: when creep test is carried out, an extension rod is arranged on the sample gauge length and extends out of the furnace to be connected with a displacement sensor, the extension rod selects a corresponding chuck to be connected with the sample gauge length according to the shape of the sample, the round sample selects the combination of figures 6 a, b and c, and the plate sample selects the combination of figures 6 a1, b1 and c 1.

4. The multi-head creep endurance testing machine according to claim 1, wherein: when the sample is stressed and deformed, the signals of the force sensors and the displacement sensors are input to a data acquisition system AWS, and a report is printed by computer processing.

5. The multi-head creep endurance testing machine according to claim 1, wherein: the three sets of stretching devices are independent and do not interfere with each other, the round sample is connected with the pull rod through threads, the plate-shaped sample is connected with the pull rod through a pin, the stretching rod is connected with the sample through a bolt for scale distance, the force measuring sensor and the displacement sensor are connected with the data acquisition system AWS and the computer through leads, the servo system is connected with the universal joint through threads, and all equipment sensors can be selected in the market.

6. The multi-head creep endurance testing machine of claim 1, wherein the heating furnace is a direct radiation type heating furnace, the flexibility is high, three thermocouples are inserted into a ①③③ hole to monitor the temperature change of the upper, middle and lower parts of the constant temperature area, the length of the constant temperature area is 100-300mm, the temperature change is adjusted by an artificial intelligent temperature controller to meet the testing requirement, the range is 100-1400 ℃, after 30 minutes of holding, the test is started until the test is finished, and the temperature is constant.

7. The multi-head creep endurance testing machine according to claim 1, wherein: the three sets of stretching devices can complete one set of test at one time, the production efficiency is high, the cost is low, one set of test is in the same constant temperature area, the influence factors are the same, the analysis of the test result and the quality improvement are facilitated, and the whole test has no asbestos ropes, no pollution and environmental protection.