CN111638137A - Microcomputer controlled bending fatigue test stand for hydraulic pipeline - Google Patents

Abstract

The invention discloses a microcomputer-controlled hydraulic pipeline piece bending fatigue test bench, comprising a test bench and a console. An installation base plate is arranged in the test bench, and a rotary integrated head seat is arranged on the installation base plate. A plurality of rotating wheels are arranged in the head seat, and the rotating wheels are driven by a driving device, and an eccentric mechanism is arranged outside the rotary integrated head seat; the mounting base plate is provided with a tailstock guide rail, and a tailstock is arranged on the tailstock guide rail. The tailstock is provided with a direction adjustment mechanism, an oil inlet block is arranged on the direction adjustment mechanism, and the oil inlet block is connected to the oil inlet mechanism. By arranging a mechanism capable of driving a plurality of eccentric mechanisms to rotate, the time required for the entire testing process is reduced. And through the use of the eccentric mechanism and the oil supply structure that can adjust the X, Y and Z axis directions of the oil supply end, while fixing the bent pipe fittings, liquids of different pressures can be introduced into the pipe fittings, so as to realize all-round operation. detection.

Description

Microcomputer Controlled Hydraulic Pipe Fitting Bending Fatigue Test Bench

technical field

The invention relates to the technical field of pressure testing, in particular to a test bench for testing the bending fatigue of hydraulic pipeline parts.

Background technique

The length of bending fatigue life of hydraulic conduits and connectors directly affects the safety of the entire aircraft. Fatigue damage is called the "killer" of aircraft safety, and is a very concerned issue in the aviation field. The current hydraulic pipeline parts bending fatigue test bench equipment is mainly used for the rotating bending fatigue strength test of rigid conduit components such as aviation hydraulic conduit components. With the development of the market, in order to more accurately test the bending fatigue life of aircraft hydraulic pipes and connectors, improve the detection efficiency and the number of test pieces in the bending fatigue test bench test for hydraulic pipe parts, and control the function and test efficiency, there are higher requirements to meet the needs of market development.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a microcomputer-controlled hydraulic pipeline piece bending fatigue test bench, so as to solve the pressure and fatigue performance test of the curved pipeline.

In order to achieve the above purpose, the present invention provides the following technical scheme: a microcomputer-controlled hydraulic pipe fitting bending fatigue test bench, including a test bench and a console, the console is connected to the test bench with electrical signals, and the test bench is provided with a mounting bottom plate, The installation base plate is provided with a rotary integrated head seat, a plurality of rotating wheels are arranged in the rotary integrated head seat, and the rotating wheels are driven by a driving device, an eccentric mechanism is arranged outside the rotary integrated head seat, and the eccentric mechanism is installed at both ends of the rotating wheel;

The installation bottom plate is provided with a tailstock guide rail, a tailstock is arranged on the tailstock guide rail, a direction adjustment mechanism is arranged on the tailstock, an oil inlet block is arranged on the direction adjustment mechanism, and the oil inlet block is connected Oil inlet mechanism.

Preferably, the driving device is a motor, and the motor and the rotating wheel are driven by a transmission belt.

Preferably, the eccentric mechanism is provided with a turntable and an eccentric member, and the eccentric member is provided on the turntable; the turntable is provided with an eccentric adjustment block, and the eccentric adjustment block is provided with a first screw, and the eccentric member is eccentrically adjusted The first screw on the block adjusts the position, and the eccentric is provided with a low-friction self-centering bearing.

Preferably, the direction adjustment mechanism is provided with an X-axis direction adjustment block, an X-axis direction moving block and a trapezoidal block that cooperate with each other, the X-axis direction adjustment block is provided with a second screw, and the X-axis direction adjustment block passes through the second screw. The screw is connected with the moving block in the X-axis direction. The moving block in the X-axis direction is provided with a third screw that can adjust the Y-axis direction, and the third screw is connected with the trapezoidal block, which is matched with the oil inlet block. .

Preferably, the tailstock is provided with a tailstock locking structure.

Preferably, there are multiple rotating wheels; and the eccentric mechanism is installed on both ends of the rotating wheel shaft.

Preferably, the oil intake mechanism is provided with a low-pressure air-drive liquid pump and a high-pressure air-drive liquid pump, the low-pressure air-drive liquid pump is connected to a medium oil tank and an air source, and the low-pressure air-drive liquid pump is connected to the high-pressure air-drive liquid pump. The pump is turned on, and the high-pressure gas drive liquid pump is turned on to the oil inlet block;

A check valve is connected in parallel with the low-pressure gas-displacing liquid pump, the high-pressure gas-driving liquid pump is connected to the medium oil tank through the check valve, and the high-pressure gas-driving liquid pump is connected to the gas source.

Preferably, a medium oil suction filter and an oil suction ball valve are arranged between the low-pressure air-driven liquid pump and the one-way valve and the medium oil tank, and the low-pressure air-driven liquid pump sequentially passes through the low-pressure air-driven liquid pump solenoid valve, proportional control valve and air filter. The device is connected to the air source, and the high-pressure air-displacement liquid pump is connected to the air source through the high-pressure air-displacement pump solenoid valve, the proportional control valve and the air filter in turn.

Compared with the prior art, the beneficial effect of the present invention is that the problems existing in the pressure and fatigue performance test of the curved pipeline can be solved through the technical solution proposed by the present invention. By arranging a structure capable of driving a plurality of eccentric mechanisms to rotate, a plurality of test pieces can be tested at the same time, thereby reducing the time required for the entire testing process. And through the use of the eccentric mechanism and the oil supply end that can adjust the X, Y and Z axis directions of the oil supply end, while fixing the bent pipe fittings, liquids of different pressures can be introduced into the pipe fittings, so that the test piece rotates. In the process, pressure is provided to its interior to realize a comprehensive inspection of it.

By setting the multi-stage gas-driven liquid pressurization method, the test pressure range is wider, the pressure dead zone is smaller, and the applicable range of the pressure is guaranteed, thereby making the entire test process more accurate.

Description of drawings

FIG. 1 is a schematic structural diagram of the bending fatigue test bench of the microcomputer-controlled hydraulic pipeline parts according to the present invention.

Fig. 2 is a schematic diagram of the test bench of the microcomputer-controlled hydraulic pipe fitting bending fatigue test bench.

FIG. 3 is a schematic diagram of the interior of the test bench for the bending fatigue test bench of the microcomputer-controlled hydraulic pipe fittings according to the present invention.

FIG. 4 is a schematic diagram of the interior of the test bench for the bending fatigue test bench of the microcomputer-controlled hydraulic pipe fittings according to the present invention.

FIG. 5 is a schematic diagram of the driving device of the microcomputer-controlled hydraulic pipeline component bending fatigue test bench according to the present invention.

FIG. 6 is a schematic diagram of the eccentric mechanism of the microcomputer-controlled hydraulic pipe fitting bending fatigue test bench according to the present invention.

FIG. 7 is a schematic diagram of the eccentric mechanism of the microcomputer-controlled hydraulic pipe fitting bending fatigue test bench according to the present invention.

FIG. 8 is a schematic diagram of the direction adjustment mechanism of the microcomputer-controlled hydraulic pipeline component bending fatigue test bench according to the present invention.

FIG. 9 is a schematic diagram of the direction adjustment mechanism of the microcomputer-controlled hydraulic pipeline component bending fatigue test bench according to the present invention.

Fig. 10 is a schematic diagram of the oil inlet mechanism of the microcomputer-controlled hydraulic pipe fitting bending fatigue test bench according to the present invention.

1. Test bench; 2. Console; 3. Installation base plate; 4. Rotary integrated head seat; 5. Rotating wheel; 6. Eccentric mechanism; 7. Tailstock guide rail; 8. Tailstock; 9. Oil inlet; 10 , motor; 11, turntable; 12, eccentric part; 13, eccentric adjustment block; 14, first screw; 15, low friction self-centering bearing; 16, X-axis direction adjustment block; 17, X-axis direction moving block; 18 , trapezoidal block; 19, the second screw; 20, the third screw; 21, the low pressure gas drive liquid pump; 22, the high pressure gas drive liquid pump; 23, the medium oil tank; 24, the one-way valve; 25, the medium oil suction filter; 26. Oil suction ball valve; 27. Solenoid valve of low-pressure gas-driven liquid pump; 28. Proportional control valve; 29. Gas filter; 30. Solenoid valve of high-pressure gas-driven liquid pump.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-10, the present invention provides a technical solution: a microcomputer-controlled hydraulic pipe fitting bending fatigue test bench, including a test bench 1 and a console 2, the console 2 is connected with the test bench 1 by electrical signals, and the test bench 1 There is an installation base plate 3, a rotary integrated head base 4 is arranged on the installation base plate 3, and a plurality of rotating wheels 5 are arranged in the rotating integrated head base 4, so as to realize the effect of driving multiple test pieces, and the rotating wheels 5 pass through the driving device. Drive, the rotating integrated head base 4 is provided with an eccentric mechanism 6, and the eccentric mechanism 6 is installed on both ends of the shaft of the rotating wheel 5, and the test piece before and after the rotating integrated head base 4 is tested on the test bench. When the fatigue test is performed on the test piece, the eccentric position of the eccentric mechanism 6 needs to be adjusted according to the situation.

In order to easily adjust the position of the tailstock 8 according to the specific length of the test piece, the mounting base plate 3 is provided with a tailstock guide rail 7, the tailstock guide rail 7 is provided with a tailstock 8, and the tailstock 8 is provided with a direction adjustment mechanism, the direction adjustment mechanism The oil inlet block 9 is provided on the upper part, so that the position of the oil inlet block 9 can be adjusted, and the precise centering with the eccentric member 12 can be achieved. The oil inlet block 9 is connected to the oil inlet mechanism.

The driving device is provided with a motor 10, the motor 10 is connected to the console 2 with an electrical signal, and the motor 10 and the rotating wheel 5 are driven by a transmission belt to drive all the rotating wheels 5 to rotate.

The eccentric mechanism 6 is provided with a turntable 11 and an eccentric piece 12, an eccentric adjustment block 13 is arranged on the turntable, a first screw 14 is arranged in the eccentric adjustment block 13, the eccentric piece 12 is screwed with the first screw 14, and the eccentric piece 12 slides on the first screw 14. The groove set on the turntable 11 can achieve the orientation effect. The eccentric member 12 is provided with a low-friction self-centering bearing 15. One end of the pipeline to be tested is installed in the low-friction self-centering bearing 15, and the other end is installed with the oil inlet block 9. achieve positioning effect. Subsequently, the first screw 14 is rotated to adjust the eccentric position of the eccentric member 12 and the turntable 11, so that the bending stress can be applied to the test piece.

In order to realize the position adjustment of the oil inlet block 9 in the Z-axis direction, and at the same time to realize the position adjustment on the X-axis and Y-axis, the direction adjustment mechanism is provided with an X-axis direction adjustment block 16, an X-axis direction moving block 17 and a trapezoidal block 18 which cooperate with each other. , the X-axis direction adjusting block 16 is provided with a second screw 19, and the X-axis direction moving block 17 is screwed with the second screw 19, the X-axis direction moving block 17 slides on the X-axis direction adjusting block 16 to achieve the orientation effect, and the X-axis direction The moving block 17 is provided with a third screw 20 that can adjust the Y-axis direction, and the trapezoidal block 18 passes through the third screw 20 and is screwed with the third screw 20. The inclined upper surface of the trapezoidal block 18 slides on the inclined surface of the oil inlet block 9. The lower surface realizes the height adjustment of the oil inlet block 9 when the trapezoidal block 18 is displaced. By rotating the second screw 19 and the third screw 20 in this way, the oil inlet block 9 can be adjusted on the X and Y axes, thereby ensuring that the oil inlet block 9 can be aligned under the condition that the eccentric member 12 and the turntable 11 have zero eccentricity. Eccentric piece 12, so as to achieve precise centering.

The tailstock 8 is provided with a tailstock locking structure, and the locking structure is a fastening screw screwed to the tailstock 8 .

The test samples and the requirements for the test are different, and the pressure on the test samples during the test is different, so the range of the test pressure is relatively large, and the pressure device in use is not conducive to ensuring that all pressure sections within the test pressure range can meet the requirements. Control accuracy of test pressure. Therefore, the device adopts a multi-stage gas-driven liquid pressurization method. The oil inlet mechanism is provided with a low-pressure gas-driven liquid pump 21 and a high-pressure gas-driven liquid pump 22. When the test pressure is lower than 8MPa, the low-pressure gas-driven liquid pump 21 provides pressure. The liquid-displacement pump 22 can ensure the pressure control accuracy within the test pressure range below 8MPa; when the test pressure is higher than 8MPa, the high-pressure gas-driven liquid pump 22 provides pressure. The low-pressure gas-driven liquid pump 21 is connected to the medium oil tank 23 and the gas source, the low-pressure gas-driven liquid pump 21 is connected to the high-pressure gas-driven liquid pump 22, and the high-pressure gas-driven liquid pump 22 is connected to the oil inlet block 9, so as to achieve the effect of oil supply .

A check valve 24 is connected in parallel with the low-pressure gas-driven liquid pump 21, and the high-pressure gas-driven liquid pump 22 is connected to the medium oil tank 23 through the check valve 24, so as to realize the independent oil supply effect of the high-pressure gas-driven liquid pump 22 when the test pressure is greater than 8MPa, The high-pressure air-displacing liquid pump 22 is connected to the air source.

A medium oil suction filter 25 and an oil suction ball valve 26 are arranged between the low-pressure gas drive liquid pump 21 and the check valve 24 and the medium oil tank 23 to protect the cleanliness of the oil entering the liquid pump and facilitate the maintenance and repair of the system. The low-pressure gas-driven liquid pump 21 is connected to the gas source through the low-pressure gas-driven liquid pump solenoid valve 27, the proportional control valve 28 and the gas filter 29 in turn, and the high-pressure gas-driven liquid pump 22 is connected to the gas source through the high-pressure gas-driven liquid pump solenoid valve 30 and the proportional control valve. 28 and the air filter 29 are connected to the air source, so as to provide clean air for the low-pressure air-driven liquid pump 21 and the high-pressure air-driven liquid pump 22 . Electrically connect the electrical components to the console 2, and select an appropriate pressure ratio. The test pressure range converted and output by the low-pressure air-drive liquid pump 21 and the high-pressure air-drive liquid pump 22 is wider, the optional test pressure dead zone is smaller, and the test pressure adjustment range is guaranteed.

Working principle: Before using the equipment, adjust the position of the eccentric member 12 relative to the turntable 11 so that the eccentric member 12 and the turntable 11 are at zero eccentricity. Adjust the second screw 19 and the third screw 20 according to the actual conditions of the equipment, so that the oil inlet block 9 can be adjusted on the X and Y axes, and achieve precise alignment with the eccentric member 12. After the adjustment, the oil inlet block 9 does not need to be adjusted again (replacement related The parts need to be readjusted to the oil inlet block 9), and the position of the oil inlet block 9 should be fixed; The other end of the test piece is installed on the low-friction self-centering bearing 15 on the eccentric piece 12, the tailstock 8 is locked, the first screw 14 is adjusted to generate bending stress on the test piece, and the strain measurement results of the test piece are observed to adjust the eccentricity. The eccentricity of the piece 12 relative to the turntable 11 meets the test requirements. Then input the test pressure to the test piece, and then make the turntable rotate at a constant speed at a certain cycle rate within the range of 1500 ~ 3600r/min according to the test requirements.

In the test, the oil supply pressure can be selected according to the specific conditions of the pipe under test. When the oil supply pressure is less than 8MPa, select the low-pressure air-drive liquid pump 21 to work, close the high-pressure air-drive liquid pump 22 and the high-pressure air-drive liquid pump solenoid valve 30, and open the low-pressure air-drive liquid pump 21 and the low-pressure air-drive liquid pump solenoid valve 27 , output air pressure through the proportional control valve 28, drive the low-pressure air-driven liquid pump 21 to work, and the low-pressure air-driven liquid pump 21 sucks the test medium from the medium oil tank 23, the medium oil suction filter 25 and the oil suction ball valve 26, and converts it into the test pressure, and then Pass through the pump head of the high-pressure air-displacing liquid pump 22 and lead to the oil inlet block 9 .

When the oil supply pressure is greater than 8MPa, the high-pressure air-drive liquid pump 22 works, closes the low-pressure air-drive liquid pump 21 and the low-pressure air-drive liquid pump solenoid valve 27, opens the high-pressure air-drive liquid pump 22 and the high-pressure air-drive liquid pump solenoid valve 30, The air pressure is output through the proportional control valve 28 to drive the high-pressure air-displacement liquid pump 22 to work. pressure is supplied directly to the feed block 9.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. Computer control hydraulic pressure pipeline spare bending fatigue test platform, including test bench (1) and control cabinet (2), control cabinet (2) and test bench (1) signal of telecommunication are connected, its characterized in that: the test bed (1) is internally provided with a mounting base plate (3), the mounting base plate (3) is provided with a rotary integration head seat (4), the rotary integration head seat (4) is internally provided with a rotating wheel (5), the rotating wheel (5) is driven by a driving device, the rotary integration head seat (4) is externally provided with an eccentric mechanism (6), and the eccentric mechanism (6) is arranged on a shaft of the rotating wheel (5);

tailstock guide rail (7) have been seted up in mounting plate (3), be equipped with tailstock (8) on tailstock guide rail (7), be equipped with direction adjustment mechanism on tailstock (8), be equipped with oil inlet block (9) on the direction adjustment mechanism, and oil inlet block (9) switch-on oil feed mechanism.

2. The bending fatigue test bench for hydraulic pipeline parts controlled by microcomputer according to claim 1, characterized in that the driving device is a motor (10), and the motor (10) and the rotating wheel (5) are driven by a transmission belt.

3. The bending fatigue test bench of microcomputer controlled hydraulic pipeline component according to claim 1, characterized in that the eccentric mechanism (6) is provided with a turntable (11) and an eccentric component (12), the eccentric component (12) is arranged on the turntable (11); be equipped with eccentric regulating block (13) on carousel (11), be equipped with first screw (14) on eccentric regulating block (13), position adjustment is carried out through first screw (14) on eccentric regulating block (13) in eccentric spare (12), be equipped with low friction self-centering bearing (15) on eccentric spare (12).

4. The bending fatigue test bench for the microcomputer-controlled hydraulic pipeline part according to claim 1, wherein the direction adjusting mechanism is provided with an X-axis direction adjusting block (16), an X-axis direction moving block (17) and a trapezoidal block (18) which are matched with each other, a second screw (19) is arranged on the X-axis direction adjusting block (16), the X-axis direction adjusting block (16) is connected with the X-axis direction moving block (17) through the second screw (19), a third screw (20) capable of adjusting the Y-axis direction is arranged on the X-axis direction moving block (17), the third screw (20) is connected with the trapezoidal block (18), and the trapezoidal block (18) is matched with the oil inlet block (9).

5. The bending fatigue test bench for microcomputer controlled hydraulic pipeline piece according to claim 1, characterized in that the tailstock (8) is provided with a tailstock locking structure.

6. The bending fatigue test bench for microcomputer controlled hydraulic line piece according to claim 1, characterized in that the number of the rotating wheels (5) is plural; the eccentric mechanisms (6) are arranged at two ends of the shaft of the rotating wheel (5).

7. The bending fatigue test bench for the microcomputer-controlled hydraulic pipeline part according to claim 1, wherein the oil inlet mechanism is provided with a low-pressure gas-driven liquid pump (21) and a high-pressure gas-driven liquid pump (22), the low-pressure gas-driven liquid pump (21) is communicated with a medium oil tank (23) and an air source, the low-pressure gas-driven liquid pump (21) is communicated with the high-pressure gas-driven liquid pump (22), and the high-pressure gas-driven liquid pump (22) is communicated with the oil inlet block (9);

the low-pressure gas-driven liquid pump (21) is connected with a one-way valve (24) in parallel, the high-pressure gas-driven liquid pump (22) is communicated with a medium oil tank (23) through the one-way valve (24), and the high-pressure gas-driven liquid pump (22) is communicated with an air source.

8. The bending fatigue test bench for the microcomputer-controlled hydraulic pipeline part according to claim 7, wherein a medium oil absorption filter (25) and an oil absorption ball valve (26) are arranged between the low-pressure gas-driven liquid pump (21), the one-way valve (24) and the medium oil tank (23), the low-pressure gas-driven liquid pump (21) is communicated with an air source sequentially through a low-pressure gas-driven liquid pump electromagnetic valve (27), a proportion regulating valve (28) and an air filter (29), and the high-pressure gas-driven liquid pump (22) is communicated with the air source sequentially through a high-pressure gas-driven liquid pump electromagnetic valve (30), the proportion regulating valve (28) and the air filter (29).

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