CN112128161A - Device for reducing static friction influence in triaxial test - Google Patents

Device for reducing static friction influence in triaxial test Download PDF

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Publication number
CN112128161A
CN112128161A CN202011154466.9A CN202011154466A CN112128161A CN 112128161 A CN112128161 A CN 112128161A CN 202011154466 A CN202011154466 A CN 202011154466A CN 112128161 A CN112128161 A CN 112128161A
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CN
China
Prior art keywords
piston rod
piston
servo motor
cylinder body
static friction
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Pending
Application number
CN202011154466.9A
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Chinese (zh)
Inventor
桑勇
孔宪京
邹德高
王意宾
刘京茂
周晨光
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Dalian University of Technology
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Dalian University of Technology
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Filing date
Publication date
Application filed by Dalian University of Technology filed Critical Dalian University of Technology
Priority to CN202011154466.9A priority Critical patent/CN112128161A/en
Publication of CN112128161A publication Critical patent/CN112128161A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/088—Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F15B15/1461—Piston rod sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/0806—Details, e.g. sample holders, mounting samples for testing
    • 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
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B2015/206—Combined actuation, e.g. electric and fluid actuated

Abstract

The invention provides a device for reducing static friction influence in a triaxial test, and belongs to the field of mechanical engineering. The lower part of a piston rod in the device goes deep into a cylinder body through a sliding sleeve, and a sealing ring and a buffer sleeve are sleeved between the lower part of the piston rod and a piston, so that the threaded bushing, the buffer sleeve, the piston and the piston rod form an organic whole. A servo motor is arranged on the right side of the hydraulic cylinder, a pair of meshed helical gears are driven below the hydraulic cylinder, and the rotary driving force of the servo motor is transmitted to the piston rod through the transmission of the motion of the helical gears. A thrust bearing is arranged below the piston rod; the lower end of the spring is used for placing a load; the piston rod moves up and down and also rotates under the action of the servo motor. The key point of the invention is that the rotary motion of the piston is compared with the prior pure up-and-down reciprocating motion, and after the rotary motion is added, the static friction between the piston and the cylinder wall can be converted into sliding friction, so that the influence of the friction force on the whole experimental equipment can be greatly reduced, and finally, a good control effect is achieved.

Description

Device for reducing static friction influence in triaxial test
Technical Field
The invention belongs to the field of mechanical engineering, relates to a soil mechanics triaxial test, and particularly relates to a device for reducing static friction influence.
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. The electro-hydraulic servo loading hydraulic cylinder is generally composed of a piston, a connecting rod, a cylinder body, a seal and the like. In the electro-hydraulic servo control system of the triaxial test, the friction force between a hydraulic cylinder piston and a cylinder body, between a piston rod and a bearing bush and between a loading rod and a pressure chamber is larger, so that the stability and the tracking precision of the system are seriously influenced. Many scholars have also adopted various methods to improve the problems caused by friction, such as improving the surface condition of the contact surfaces, increasing the lubrication degree of the contact surfaces, adopting various friction compensation techniques, etc.
However, increasing the machining accuracy improves the surface condition of the contact surfaces, is extremely costly, and cannot be subjected to lateral forces to damage the machined surfaces. The lubrication degree of the contact surface is improved, and the polytetrafluoroethylene seal is generally adopted, so that the influence of friction force is reduced. Various friction compensation techniques do reduce the effects of friction, but do not significantly reduce the effects of friction. In addition, the mode of increasing vibration excitation is often adopted in engineering, the influence of friction is reduced, however, the vibration excitation mode can generate great noise, high-frequency disturbance can be generated on a sample, and the experiment is not facilitated. At present, there is a need for a device that achieves low cost and is easy to retrofit old equipment, effectively reducing the effects of friction.
Disclosure of Invention
The invention aims to greatly reduce the influence of friction force in an electro-hydraulic servo system, and in order to solve the problem, the invention provides a mechanism device for a hydraulic cylinder piston rod to slowly rotate at a constant speed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for reducing static friction influence in a triaxial test comprises a motor guide rail 1, a servo motor 2, a small bevel gear 3, a load 4, a spring 5, a thrust bearing 6, a nut fastening device A7, an oil outlet 8, a cylinder wall 9, a plunger sealing element (A type) 10, an O-shaped sealing ring 11, an oil inlet 12, a loop bar sealing element 13, a cleaning ring 14, a sliding bearing 15, an integral support 16, a nut fastening device B17, a threaded bushing 18, a throttle valve 19, a buffer bush A20, a piston 21, a buffer bush B22, a piston rod 23, a check valve 24 with exhaust, a flange 25 and a large bevel gear 26.
The integral support 16 is a frame structure and plays a role in integral support and fixation; the top of the linear guide rail 1 is arranged on the top frame of the integral bracket 16 and is positioned on the right side; the load 4 rests on the bottom frame of the integrated bracket 16.
The lower part of the piston rod 23 is deeply inserted into the cylinder body through the sliding sleeve to be connected with the piston 21, a sealing ring and a buffer sleeve A20 are sleeved between the lower part of the piston rod 23 and the piston 21, the threaded bushing 18 is fixedly connected to the periphery of the buffer sleeve A20, and the threaded bushing 18, the buffer sleeve B22 and the buffer sleeve A20 provide a vertical restraining force for the piston 21, so that the threaded bushing 18, the buffer sleeve A20, the buffer sleeve B22, the piston 21 and the piston rod 23 form an organic whole which can reciprocate up and down in the cylinder body. The side wall of the piston 21 is in close contact with the inner wall 9 of the cylinder body through an A-type plunger seal 10, the piston 21 can be subjected to horizontal constraint force by the A-type plunger seal 10, and the piston 21 and the piston rod 23 can be subjected to vertical constraint force by the threaded bushing 18 and the buffer sleeves A20 and B22 arranged on the piston rod 23.
The flange 25 is arranged above the cylinder body, is in contact with the piston rod 23 through the loop bar sealing piece 13 and fastens the upper half part of the cylinder body, and an O-shaped sealing ring 11 is arranged between the flange 25 and the piston rod 23 and used for sealing the reciprocating motion; the cleaning ring 14 is positioned above the flange 25 and used for filtering hydraulic oil impurities and playing a role in purifying hydraulic oil; and a plurality of nut fastening devices A7 and B17 which are uniformly distributed are arranged below the cylinder body and fasten the lower end cover and the lower half part of the cylinder body 9 together.
The oil inlet 12 is arranged above the hydraulic cylinder and used for flowing high-energy hydraulic oil into the cylinder body from the outside, the high-energy hydraulic oil pushes the piston 21 to move downwards under the action of hydraulic energy, the high-energy hydraulic oil is converted into low-energy hydraulic oil when flowing to the lower part of the cylinder body and then flows out of the oil outlet 8, and the piston 21 and the piston rod 23 are driven to reciprocate up and down by the repeated circulation of the hydraulic oil. The oil outlet 8 is arranged below the side wall of the cylinder body and communicated with the inner cavity of the cylinder body.
The right side of the hydraulic cylinder is provided with a servo motor 2, the right side of the servo motor 2 is fixed on a linear guide rail 1, the servo motor 2 can reciprocate up and down along the linear guide rail 1, the output end below the servo motor 2 is connected with a pair of meshed helical gears 3 and 26 through flat keys, the large helical gear 26 and the small helical gear 3 are also connected with a piston rod 23 through flat keys, and the rotary driving force of the servo motor 2 is transmitted to the piston rod 23 through the transmission of the motion of the helical gears, so that the piston rod 23 is driven to rotate. The flat key has the advantages of large bearing torque, long service life, good guidance quality and the like under the same shaft diameter; in consideration of the problems of stability, bearing capacity and the like in the motion transmission process, a helical gear with a helical angle of 30 degrees is adopted as a mechanism for transmitting the motion and the power.
A sliding bearing 15 is arranged above the piston rod 23, the sliding bearing 15 comprises four parts, namely a shaft diameter, a bearing bush, a bearing seat and a bearing cover, the bearing cover and the bearing seat are connected through a stud, the joint surface of the bearing cover and the bearing seat is positioned by a pin, and gaskets with different thicknesses are placed to adjust the bearing gap; the shaft diameter is arranged in a small section groove of the piston rod 23, the bearing bush is sleeved on the shaft diameter, when the piston rod 23 moves up and down, the sliding bearing 15 is driven to move up and down integrally under the action of the shaft, the sliding bearing 15 and the servo motor 2 are connected by the middle support, and the servo motor 2 is pulled to move up and down in the motor guide rail 1.
The bottom of the piston rod 23 is connected with a thrust bearing 6 through a bracket and a bolt, the thrust bearing 6 consists of two thrust washers and a plurality of rolling bodies, and the rolling bodies are combined into a whole by a copper retainer. A spring 5 is arranged below the thrust bearing 6, and a load 4 is placed at the lower end of the spring 5; the piston rod 23 moves up and down and simultaneously rotates under the action of the servo motor 2, when the piston rod 23 pushes the spring 5 to press the load 4, the thrust bearing 6 separates the rotation under the action of pressure, the lower end load 4 is static, and the piston rod 23 still rotates, wherein the thrust bearing 6 separates the movement.
Further, the material of the piston rod 23 and the piston 21 is 45 steel.
Furthermore, a check valve 24 with exhaust is installed on the left side of the oil inlet 10, and is used for exhausting redundant air in the hydraulic cylinder to play a role in balancing pressure.
Furthermore, a throttle valve 19 is arranged on the left side of the oil outlet 8 and used for adjusting the pressure and the flow of the hydraulic oil to be required, so that the saved hydraulic oil is returned to one side of the low pressure, and the whole hydraulic oil can flow circularly.
The invention has the advantages that: piston rod and piston are rotatory under servo motor's effect, do not have the drive force that the effect only acted on from top to bottom before comparing, and the stiction between piston and the cylinder body wall can convert sliding friction into, and according to the physical principle that sliding friction is far less than the stiction, can greatly effectively reduce the influence of frictional force, improves the motion accuracy, prolongs the life of pneumatic cylinder.
Drawings
Fig. 1 is a schematic diagram of a partial half throw of a piston rod rotatable friction reducing hydraulic device.
In the figure: 1, a motor guide rail; 2, a servo motor; 3, a bevel pinion; 4, loading; 5, a spring; 6 a thrust bearing; 7, a nut fastening device A; 8, an oil outlet; 9, the inner wall of the cylinder body; 10 plunger seal (type a); 11O-shaped sealing rings; 12 oil inlet; 13 a stem seal; 14 cleaning the ring; 15 a sliding bearing; 16 an integral support; 17 nut fastening means B; 18 a threaded bushing; 19 a throttle valve; 20, a buffer sleeve A; 21 a piston; 22 a buffer sleeve B; 23 a piston rod; 24 one-way valve with exhaust; 25, flanges; 26 large bevel gears.
Fig. 2 is a front view of the piston rod, which is a stepped shaft type structure.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
As shown in fig. 1, the piston rod rotatable type antifriction hydraulic device specifically comprises a motor guide rail 1, a servo motor 2, a bevel pinion 3, a load 4, a spring 5, a thrust bearing 6, a nut fastening device 7, an oil outlet 8, a cylinder wall 9, a plunger seal (a-shaped) 10, an O-shaped seal ring 11, an oil inlet 12, a loop bar seal 13, a cleaning ring 14, a sliding bearing 15, an integral support 16, a nut fastening device 17, a threaded bushing 18, a throttle valve 19, a cushion collar 20, a piston 21, a cushion collar 22, a piston rod 23, a check valve 24 with exhaust, a flange 25 and a large bevel gear 26.
The lower part of the piston rod 23 is inserted into the cylinder body through a sliding bush and is connected with the piston 21, and a sealing ring and a buffer bush A20, B22 are sleeved and connected between the lower part of the piston rod 23 and the piston 21; the A-type plunger seal 10 fixedly connects the piston 21 with the cylinder wall 9, so that the piston 21 is subjected to a horizontal restraining force, and the threaded bushing 18 and the buffer sleeves A20 and B22 on the periphery of the piston rod 23 are subjected to a vertical restraining force on the piston 21 and the piston rod 23.
The flange 25 and the piston rod 23 are fixedly connected together by the O-shaped sealing ring 11 and the sleeve rod seal 13; the cleaning ring 14 is positioned above the flange and plays a role in filtering impurities of the hydraulic oil and purifying the hydraulic oil; the right servo motor 2 is fixed on the linear guide rail 1 and can reciprocate up and down; the output end of the servo motor is connected to the pair of engaged helical gears 3 and 26, and the servo motor 2 is driven to rotate the piston rod 23.
The oil inlet 12 is filled with high-energy hydraulic oil, the left side of the oil inlet is provided with a check valve 24 with exhaust, and the purpose of exhausting redundant air in the hydraulic cylinder is achieved, so that the effect of balancing pressure is achieved. The oil outlet 8 is positioned below the cylinder body, low-energy hydraulic oil flows out of the oil outlet, and a throttle valve is arranged on the left side of the oil outlet and aims to adjust the hydraulic oil to the required pressure and flow rate, so that the saved hydraulic oil is conveyed back to the low-pressure side, and the whole hydraulic oil can flow circularly.
The complete set of devices are fastened and connected through the bracket 16, so that the complete set of devices can be definitely cooperated according to labor, and finally, the expected motion control effect is achieved.
The core point of the invention is that the piston 21 rotates slowly, compared with the previous pure up-and-down reciprocating motion, the static friction between the piston 23 and the cylinder wall 9 after the rotation motion can be converted into sliding friction, and the influence of the friction force on the whole experimental equipment can be greatly reduced according to the physical principle that the sliding friction is much smaller than the static friction; especially for the large-diameter hydraulic cylinder, because the contact area between the piston and the cylinder body wall is large, the friction force is also large, and the rotary piston is adopted, on one hand, the constraint of the friction force can be greatly reduced, on the other hand, the influence of noise can also be reduced, and a good control effect is achieved; in addition, the rotating speed of the servo motor 2 can be adjusted to change the rotating speed of the piston rod 23, so that the sliding friction can be changed according to the load under different working conditions, and the system has good adaptability.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.

Claims (3)

1. A device for reducing static friction influence in a triaxial test is characterized by comprising a motor guide rail (1), a servo motor (2), a small bevel gear (3), a load (4), a spring (5), a thrust bearing (6), a nut fastening device A (7), a loop bar sealing element (13), a cleaning ring (14), a sliding bearing (15), an integral support (16), a threaded bushing (18), a piston (21), a piston rod (23), a flange (25) and a large bevel gear (26);
the integral support (16) is of a frame structure and plays a role in integral support and fixation; the top of the linear guide rail (1) is arranged on the top frame of the integral bracket (16) and is positioned on the right side; the load (4) is placed on the bottom frame of the integrated bracket (16);
the lower part of the piston rod (23) is extended into the cylinder body through a sliding sleeve to be connected with the piston (21), the threaded bushing (18), the buffer sleeve (20), the piston (21) and the piston rod (23) are an organic whole, and the whole can reciprocate up and down in the cylinder body; the side wall of the piston (21) is tightly contacted with the inner wall (9) of the cylinder body through an A-type plunger seal (10);
the flange (25) is arranged above the cylinder body, is in contact with the piston rod (23) through a loop bar sealing element (13), and fastens the upper half part of the cylinder body; the cleaning ring (14) is positioned above the flange (25); nut fastening devices A (7) which are uniformly distributed are arranged below the cylinder body and fasten the lower end cover and the lower half part of the cylinder body (9) together;
an oil inlet (12) is formed above the hydraulic cylinder and used for allowing high-energy hydraulic oil to flow into the cylinder body from the outside, and an oil outlet (8) is formed below the side wall of the cylinder body and communicated with the inner cavity of the cylinder body; the piston (21) and the piston rod (23) are driven to reciprocate up and down by the repeated circulation of the hydraulic oil; a check valve (24) with exhaust is installed on the left side of the oil inlet (10) and used for exhausting redundant air in the hydraulic cylinder; a throttle valve (19) is arranged on the left side of the oil outlet (8) and used for adjusting the pressure and the flow of the hydraulic oil to be required so as to ensure that the whole hydraulic oil can circularly flow;
a servo motor (2) is installed on the right side of the hydraulic cylinder, the right side of the servo motor (2) is fixed on a linear guide rail (1), the servo motor (2) can reciprocate up and down along the linear guide rail (1), the lower part of the servo motor (2) is connected with a pair of meshed helical gears (3) and (26), the large helical gear and the small helical gear (26) are both connected with a piston rod (23) through a flat key, and the rotary driving force of the servo motor (2) is transmitted to the piston rod (23) through the transmission of the motion of the helical gears, so that the piston rod (23) is driven to rotate;
a sliding bearing (15) is arranged above the piston rod (23), the piston rod (23) moves up and down to drive the sliding bearing (15) to move up and down integrally, and the servo motor (2) is pulled to move up and down in the motor guide rail (1);
the bottom of the piston rod (23) is connected with a thrust bearing (6); a spring (5) is arranged below the thrust bearing (6), and a load (4) is placed at the lower end of the spring (5); the piston rod (23) moves up and down and also rotates under the action of the servo motor (2); when the piston rod (23) pushes the spring (5) to press the load (4), under the action of pressure, the thrust bearing (6) can separate the rotary motion, the lower end load (4) is static, and the piston rod (23) still makes the rotary motion, wherein the thrust bearing (6) plays a role in separating the motion.
2. The device for reducing the static friction influence in the triaxial test according to claim 1, wherein the threaded bushing (18), the cushion sleeve, the piston (21) and the piston rod (23) are an organic whole, specifically: a sealing ring and a buffer sleeve (20) are sleeved and connected between the lower part of the piston rod (23) and the piston (21), and a threaded bushing (18) is fixedly connected to the periphery of the buffer sleeve A (20); the buffer sleeve arranged on the piston rod (23) can enable the piston (21) and the piston rod (23) to be subjected to constraint force in the vertical direction.
3. The device for reducing the influence of static friction in the triaxial test according to claim 1, wherein an O-ring (11) is further disposed between the flange (25) and the piston rod (23).
CN202011154466.9A 2020-10-26 2020-10-26 Device for reducing static friction influence in triaxial test Pending CN112128161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011154466.9A CN112128161A (en) 2020-10-26 2020-10-26 Device for reducing static friction influence in triaxial test

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011154466.9A CN112128161A (en) 2020-10-26 2020-10-26 Device for reducing static friction influence in triaxial test

Publications (1)

Publication Number Publication Date
CN112128161A true CN112128161A (en) 2020-12-25

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CN202011154466.9A Pending CN112128161A (en) 2020-10-26 2020-10-26 Device for reducing static friction influence in triaxial test

Country Status (1)

Country Link
CN (1) CN112128161A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114112769A (en) * 2021-11-24 2022-03-01 中国水利水电科学研究院 Triaxial tester pressure chamber piston friction force calibration method and device
CN117571212A (en) * 2024-01-16 2024-02-20 浙江大学 Sealing ring durability test system under high-pressure gas circulation condition

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114112769A (en) * 2021-11-24 2022-03-01 中国水利水电科学研究院 Triaxial tester pressure chamber piston friction force calibration method and device
CN114112769B (en) * 2021-11-24 2022-07-22 中国水利水电科学研究院 Triaxial tester pressure chamber piston friction force calibration method and device
CN117571212A (en) * 2024-01-16 2024-02-20 浙江大学 Sealing ring durability test system under high-pressure gas circulation condition

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