CN213684797U - Automatic protection device for impact load in triaxial test - Google Patents
Automatic protection device for impact load in triaxial test Download PDFInfo
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- CN213684797U CN213684797U CN202022399773.5U CN202022399773U CN213684797U CN 213684797 U CN213684797 U CN 213684797U CN 202022399773 U CN202022399773 U CN 202022399773U CN 213684797 U CN213684797 U CN 213684797U
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- 238000012360 testing method Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 230000009471 action Effects 0.000 abstract description 8
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 81
- 238000002474 experimental method Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Abstract
The utility model provides an impact load's automatic safety device among triaxial test, belongs to the mechanical engineering field, includes and is a holistic relief valve and switching-over valve within a definite time through the hydraulic pressure pipe intercommunication: and a reversing valve oil port T of the reversing valve III is communicated with a safety valve oil inlet I of the safety valve II, and a reversing valve oil port F is communicated with a safety valve oil outlet II. Two oil ports of the hydraulic cylinder are respectively communicated with a reversing valve oil port B and a reversing valve oil port A of a reversing valve by a hydraulic pipe on the basis of an original hydraulic control system. Under the action of the reversing valve, the action process of the reversing valve can keep the oil port T (the oil inlet I of the safety valve) of the reversing valve to bear the highest internal pressure of the double-acting hydraulic cylinder. When impact load appears, the plunger moves upwards, the oil inlet I of the safety valve is communicated with the oil outlet II of the safety valve, and the impact load is removed. The utility model discloses an adjustable automatic protection's of regulation torque motor output constant moment size trigger condition, the reaction is sensitive reliable, can carry out the adaptability protection to the impact load among the hydraulic means.
Description
Technical Field
The utility model belongs to the mechanical engineering field relates to soil mechanics triaxial test, especially relates to an impact load's automatic safety device.
Background
A triaxial tester is frequently used for measuring the strength and deformation of soil, has wide application range, and can be used for measuring various parameters including shear strength characteristics, consolidation characteristics and soil permeability. The triaxial tester usually adopts the mode of electro-hydraulic servo loading, and the axial loading force needs to be set according to the magnitude of confining pressure in the experimental process. However, in the triaxial test, a very important test, namely the liquefaction test, needs to be continuously loaded back and forth, the dynamic strength is gradually reduced in the loading process, and the load characteristic is poor. The test specimen is likely to break during shearing, resulting in the occurrence of impact loads. Therefore, in order to protect the equipment, an automatic protection device for impact load is urgently needed in the actual experiment process.
At present, no related products exist at home and abroad. Generally, a pressure reduction control mode is adopted on the premise of engineering requirements, namely, the pressure of oil supply is reduced. However, this approach is not conducive to control of the servo valve, and the dynamic control performance of the control system is generally poor when the oil pressure is low. Therefore, it is very difficult to achieve automatic protection of the impact load under the condition that the high-pressure oil source is supplied with oil.
SUMMERY OF THE UTILITY MODEL
The utility model aims at realizing the automatic protection of the impact load. The device is a double-acting piston hydraulic cylinder with a safety protection valve, and can quickly unload a load when the load is subjected to higher impact load so as to realize automatic protection of a sample in an experimental process.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
an automatic protection device for impact load in a triaxial test comprises a safety valve II and a reversing valve III, and is used for protecting a hydraulic cylinder I, and the hydraulic cylinder I to be protected is a general double-acting piston hydraulic cylinder.
The safety valve II comprises a safety valve shell, a torque motor, a motor bolt assembly, a flat key, a motor gear, a supporting shaft, a push rod, a rivet, a plunger (safety valve spool), a safety valve body, a safety valve oil inlet I, a safety valve oil outlet II and a safety valve fixing screw I. The reversing valve III comprises a reversing valve body, a reversing valve core positioned in the reversing valve body, a reversing valve oil port B, a reversing valve oil port T, a reversing valve oil port A and a reversing valve oil port F which are arranged on the reversing valve body.
The safety valve II and the reversing valve III are communicated into a whole through a hydraulic pipe. The specific connection mode is that a reversing valve oil port T of a reversing valve III is communicated with a safety valve oil inlet I of a safety valve II, and a reversing valve oil port F is communicated with a safety valve oil outlet II. Two oil ports of the hydraulic cylinder I are respectively communicated with a reversing valve oil port B and a reversing valve oil port A of a reversing valve by a hydraulic pipe on the basis of an original hydraulic control system.
And a torque motor in the safety valve II is fixed on a safety valve shell through a motor bolt assembly, and the transmission effect is realized through a flat key and a motor gear. The safety valve shell and the supporting shaft are fixed through welding. The gear is arranged on the supporting shaft of the safety valve shell and is meshed with the motor gear; the surface of one side of the gear is welded with a push rod shaft, the top of the push rod is matched with a concentric shaft of the push rod shaft, and the lower end of the push rod is connected with a plunger (a safety valve core) through a rivet. The spherical end of the plunger (safety valve core) is positioned in the safety valve body, and the plunger is installed and sealed by a sealing groove and a shaft sealing ring. The safety valve body is fixed on the safety valve shell through a safety valve fixing screw I. Under the pressure applied by the push rod, a plunger (a safety valve core) is in close contact with a safety valve oil inlet I at the bottom of a safety valve body, and the sealing condition is met during pressing.
And a reversing valve core in the reversing valve III is hermetically arranged in a reversing valve body, and the two sides of the reversing valve core are provided with limit stop blocks to limit the displacement distance. A reversing valve oil port B, a reversing valve oil port T, a reversing valve oil port A and a reversing valve oil port F are formed in a reversing valve body, the reversing valve oil port B, the reversing valve oil port T and the reversing valve oil port A are located on one side of the valve body, the reversing valve oil port T is located in the middle of the three oil ports, and the reversing valve oil port F is located on the other side of the valve body; and the position of the valve core of the reversing valve relative to the valve body of the reversing valve can be controlled by the pressure difference between the oil port B of the reversing valve and the oil port A of the reversing valve according to the internal structure principle, so that the automatic reversing function under different conditions can be realized.
The utility model discloses a working process does:
if the hydraulic strength of the oil port B of the reversing valve is higher than that of the oil port A of the reversing valve, the valve core of the reversing valve is positioned on the left side in the reversing valve body under the pushing of the pressure difference of two sides, the oil port B of the reversing valve is communicated with T, and the oil port A of the reversing valve is communicated with F; if the hydraulic strength of the oil port B of the reversing valve is lower than that of the oil port A of the reversing valve, the valve core of the reversing valve is positioned on the right side in the reversing valve body under the pushing of differential pressure, the oil port B of the reversing valve is communicated with the oil port F, and the oil port A of the reversing valve is communicated with the oil port T. The action process of the reversing valve can keep the oil port T (the oil inlet I of the safety valve) of the reversing valve to bear the highest internal pressure of the double-acting hydraulic cylinder I.
The torque motor is set to be in a constant torque control mode, constant torque is output to the motor gear through the flat key, and then the constant torque is output to the gear mounted on the supporting shaft through a gear meshing mode. Under the action of torque, the gear has a tendency of driving the push rod to move downwards, namely the push rod and a plunger (safety valve spool) are pushed downwards, the plunger (safety valve spool) is in close contact with a safety valve oil inlet I at the bottom of a safety valve body, the downward movement tendency is limited, and the sealing state between the plunger (safety valve spool) and the safety valve oil inlet I is maintained.
When impact load appears, the hydraulic oil pressure that plunger (relief valve case) received at relief valve oil inlet I is higher than the plunger pressure under the effect of torque motor, and plunger (relief valve case) rebound, and relief valve oil inlet I, relief valve oil-out II are linked together, will strike load and unload.
The working process of the whole device realizes the automatic protection function of the impact load in the triaxial experiment. The setting of the automatic protection triggering condition of the impact load can be completed by adjusting the constant torque output of the torque motor, and the normal working requirement of the hydraulic cylinder under normal low pressure and the automatic protection function of the hydraulic cylinder under the impact load in any direction are met.
Drawings
Fig. 1 is a schematic view of the overall structure of an automatic protection device for impact load in a triaxial test.
Fig. 2 is a sectional view of the structure of the safety valve device.
Fig. 3 is a cross-sectional view of the structure of the reversing valve assembly.
In the figure: i, a hydraulic cylinder; II, a safety valve; III, a reversing valve;
1 a safety valve housing; 2, a torque motor; 3, a motor bolt component; 4, flat bond; 5, a motor gear; 6, a gear; 7 supporting the shaft; 8 push rod shaft; 9 push rods; 10, riveting; 11 plunger (safety valve spool); 12 a safety valve body; 13, an oil inlet I of a safety valve; 14 safety valve oil outlet II; 15 safety valve fixing screws; 16 a diverter valve body; 17 a reversing valve core; 18 a reversing valve oil port B; 19 a reversing valve oil port T; 20 a reversing valve oil port A; 21 change valve port F.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings and the technical solutions.
An automatic protection device for impact load in a triaxial experiment specifically comprises a safety valve II and a reversing valve III. On the basis of an original hydraulic control system, two oil ports of the hydraulic cylinder I are respectively divided into hydraulic pipes which are communicated with a reversing valve oil port B18 and a reversing valve oil port A20 of a reversing valve III. And a reversing valve oil port T19 of the reversing valve III is communicated with a safety valve oil inlet I13 of the safety valve II through a hydraulic pipe, and a reversing valve oil port F21 is communicated with a safety valve oil outlet II 143 through a hydraulic pipe.
The hydraulic cylinder I of the main design protected object is a basic double-acting hydraulic cylinder. The torque motor 2 in the safety valve II is fixed on the safety valve shell 1 through the motor bolt assembly 3, the supporting shaft 7 is fixed on the safety valve shell 1 in a welding mode, and the safety valve body 12 is fixed on the safety valve shell 1 through a safety valve fixing screw I15. The output shaft of the torque motor 2 is assembled with the motor gear 5 in a key connection mode through a flat key 4. The gear 6 is mounted on a support shaft 7 of the safety valve housing 1, and is engaged with the motor gear 5. A push rod shaft 8 is welded on one side surface of the gear 6. The top of the push rod 9 is coaxially matched with the push rod shaft 8, and the lower end of the push rod 9 is connected together through a rivet 10 and a plunger (safety valve core) 11. The spherical end of the plunger (safety valve spool) 11 is located inside the safety valve body 12, and is mounted and sealed with a seal groove and a shaft seal ring. Under the pressure applied by the push rod 9, a plunger (safety valve core) 11 is in close contact with a safety valve oil inlet I13 at the bottom of a safety valve body 12, and the sealing condition is met during pressing. And a reversing valve core 17 in the reversing valve III is hermetically arranged in a reversing valve body 16, and the displacement distance is limited by the stop blocks at two sides. The reversing valve body 16 is externally provided with four oil ports, namely a reversing valve oil port B18, a reversing valve oil port T19, a reversing valve oil port A20 and a reversing valve oil port F21, and the position of the reversing valve spool 17 relative to the reversing valve body 16 can be controlled by pressure difference between the reversing valve oil port B18 and the reversing valve oil port A20 according to the internal structure principle, so that automatic reversing under different conditions is realized.
As shown in fig. 2, when the automatic protection device for impact load is assembled, the parts are cleaned by kerosene, after air drying, the parts are matched with the surface to be oiled, the surfaces of the parts which are not processed are removed of burrs and cleaned, and the assembling surface is ensured not to be damaged during assembling.
In the working process, when an impact load occurs, if the hydraulic strength of the reversing valve oil port B18 is higher than that of the reversing valve oil port A20, the reversing valve spool 17 is pushed by pressure difference at two sides to be positioned at the left side inside the reversing valve body 16, the reversing valve oil port B18 is communicated with the T19, and the reversing valve oil port A20 is communicated with the F21; if the hydraulic strength of the reversing valve oil port B18 is lower than that of the reversing valve oil port A20, the reversing valve spool 17 is pushed by pressure difference to be located on the right side inside the reversing valve body 16, the reversing valve oil port B18 is communicated with the F21, and the reversing valve oil port A20 is communicated with the T19. The action process of the reversing valve can be realized, and the highest pressure in the double-acting hydraulic cylinder I can be kept at the oil port T19 (the oil inlet I13 of the safety valve) of the reversing valve.
The torque motor 2 is set to be in a constant torque control mode, constant torque is output to a motor gear 5 through a flat key 4, and then the constant torque is output to a gear 6 arranged on a support shaft 7 through a gear meshing mode. Under the action of torque, the gear 6 has a tendency of driving the push rod shaft 8 to move downwards, namely, the push rod 9 and the plunger (safety valve spool) 11 are pushed downwards, as shown in fig. 2, under the normal working condition, the push rod 9 and the plunger (safety valve spool) 11 are both in a vertical state relative to the safety valve body 12, the plunger (safety valve spool) 11 is in close contact with a safety valve oil inlet I13 at the bottom of the safety valve body 12, the downward movement tendency is limited, and the sealing state between the plunger (safety valve spool) 11 and the safety valve oil inlet I13 is maintained. The reduction ratio of the gear 6 relative to the motor gear 5, the length of a connecting line of the push rod shaft and the axis of the supporting shaft and the size of an included angle between the connecting line of the push rod shaft and the axis of the supporting shaft and the push rod force can amplify the output torque of the torque motor 2.
When an impact load occurs, the hydraulic oil pressure borne by the plunger (safety valve spool) 11 at the safety valve oil inlet I13 is higher than the plunger pressure under the action of the torque motor 2, the plunger (safety valve spool) 11 moves upwards, the safety valve oil inlet I13 is communicated with the safety valve oil outlet II 14, and the unloading process of the impact load is completed.
The automatic protection device for the impact load in the triaxial experiment mainly relates to an automatic protection device for a double-acting hydraulic cylinder, and comprises an action principle and a corresponding installation mode, and the whole structure is simply designed. However, the above-mentioned embodiments only represent the embodiments of the present invention, but it should be noted that, for those skilled in the art, a plurality of modifications and improvements can be made without departing from the scope of the present invention, and all of them belong to the protection scope of the present invention.
The above-mentioned embodiments only represent the embodiments of the present invention, but can not be understood as the limitation of the scope of the present invention, and it should be noted that, for those skilled in the art, a plurality of variations and improvements can be made without departing from the concept of the present invention, and all of them belong to the protection scope of the present invention.
Claims (1)
1. The automatic protection device for the impact load in the triaxial test is characterized by comprising a safety valve II and a reversing valve III, wherein the safety valve II and the reversing valve III are used for protecting a hydraulic cylinder I; the safety valve II comprises a safety valve shell (1), a torque motor (2), a motor bolt assembly (3), a flat key (4), a motor gear (5), a gear (6), a support shaft (7), a push rod shaft (8), a push rod (9), rivets (10), a plunger (11), a safety valve body (12), a safety valve oil inlet I (13), a safety valve oil outlet II (14) and a safety valve fixing screw I (15); the reversing valve III comprises a reversing valve body (16), a reversing valve core (17), a reversing valve oil port B (18), a reversing valve oil port T (19), a reversing valve oil port A (20) and a reversing valve oil port F (21);
the safety valve and the reversing valve III are communicated into a whole through a hydraulic pipe, the reversing valve oil port T (19) of the reversing valve III is communicated with a safety valve oil inlet I (13) of the safety valve II, and the reversing valve oil port F (21) is communicated with a safety valve oil outlet II (14); two oil ports of the hydraulic cylinder are respectively divided into a hydraulic pipe to be communicated with a reversing valve oil port B (18) and a reversing valve oil port A (20) of a reversing valve on the basis of an original hydraulic control system;
a torque motor (2) in the safety valve II is fixed on a safety valve shell (1), and the transmission effect is realized through a flat key (4) and a motor gear (5); the gear (6) is arranged on a supporting shaft (7) of the safety valve shell (1) and is meshed with the motor gear (5); a push rod shaft (8) is welded on the surface of one side of the gear (6), the top of the push rod (9) is in concentric shaft fit with the push rod shaft (8), the lower end of the push rod (9) is connected with a plunger (11), the spherical end part passing through the plunger (11) is positioned in a safety valve body (12), and a sealing groove and a shaft sealing ring are used for installation and sealing; the safety valve body (12) is fixed on the safety valve shell (1); under the pressure applied by the push rod (9), the plunger (11) is in close contact with a safety valve oil inlet I (13) at the bottom of a safety valve body (12), and the sealing condition is met during pressing;
a reversing valve core (17) in the reversing valve III is hermetically arranged in a reversing valve body (16), and two sides of the reversing valve core are provided with limiting stop blocks to limit the displacement distance; a reversing valve oil port B (18), a reversing valve oil port T (19), a reversing valve oil port A (20) and a reversing valve oil port F (21) are formed in a reversing valve body (16), and the position of a reversing valve spool (17) relative to the reversing valve body (16) can be controlled by pressure difference between the reversing valve oil port B (18) and the reversing valve oil port A (20) according to the internal structure principle, so that the automatic reversing function under different conditions can be realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022399773.5U CN213684797U (en) | 2020-10-26 | 2020-10-26 | Automatic protection device for impact load in triaxial test |
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| CN202022399773.5U CN213684797U (en) | 2020-10-26 | 2020-10-26 | Automatic protection device for impact load in triaxial test |
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| CN213684797U true CN213684797U (en) | 2021-07-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145505A (en) * | 2020-10-26 | 2020-12-29 | 大连理工大学 | Automatic protection device for impact load in triaxial test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145505A (en) * | 2020-10-26 | 2020-12-29 | 大连理工大学 | Automatic protection device for impact load in triaxial test |
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