CN112378778B - High-low temperature hydraulic large-load compression test system for composite material - Google Patents
High-low temperature hydraulic large-load compression test system for composite material Download PDFInfo
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- CN112378778B CN112378778B CN202011253757.3A CN202011253757A CN112378778B CN 112378778 B CN112378778 B CN 112378778B CN 202011253757 A CN202011253757 A CN 202011253757A CN 112378778 B CN112378778 B CN 112378778B
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- 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
- G01N3/18—Performing tests at high or low temperatures
Abstract
The invention relates to the technical field of composite material low-temperature compression tests, in particular to a composite material high-low temperature hydraulic large-load compression test system, which comprises: the compression clamp comprises an upper clamping seat and a lower clamping seat which are oppositely arranged in the vertical direction, and the upper clamping seat and the lower clamping seat are relatively far away or close to each other under the action of external force; cavities are arranged on the upper clamping seat and the lower clamping seat, and a movable clamping block and a fixed clamping block are arranged in the cavities; the outer side walls of the clamping seats are respectively provided with a transverse driving assembly for driving the movable clamping blocks to clamp the splines, the transverse driving assemblies comprise sleeves, hydraulic cylinders and transmission rods, and the intelligent hydraulic control unit is used for controlling the pressure of the hydraulic cylinders; the invention is isolated outside the high-low temperature environment box through the transverse driving assembly, reduces the influence of the high-low temperature environment on hydraulic oil, improves the accuracy of test results, controls the output pressure of the hydraulic cylinder through the intelligent hydraulic control unit, and ensures the balance of sample strip stress in the compression test process.
Description
Technical Field
The invention relates to the technical field of composite material low-temperature compression tests, in particular to a composite material high-low temperature hydraulic large-load compression test system.
Background
The application of carbon fiber, glass fiber and other polymer fiber reinforced composite materials in the industries of wind power, aerospace, rail transit and the like is more and more extensive, the mechanical property test of the corresponding composite materials also becomes an important link for development and application of the composite materials, the compression test is a test for measuring the mechanical property of the materials under the action of axial static pressure, and as the thickness of a composite material compression test sample strip is gradually expanded from one millimeter to dozens of millimeters, the traditional compression clamp cannot meet the increasing load requirement.
In the prior art, the loading modes of a compression clamp on a test spline mainly comprise a shearing loading mode and an end part loading mode, however, in the compression test process, along with the increase of the load added to the spline, the clamping force required for fixing a sample piece is larger, the traditional shearing loading mode and the end part loading mode can not ensure the stability of the clamping force on the two ends of the spline, the phenomena of spline end part damage and the like can be easily caused, and the performance of the spline can not be accurately tested;
in order to solve the above problems, the prior art also proposes a method of testing by weakening the thickness of the material, but the damage and interference of the sample caused by human before the test can also increase the error of the final test result.
In the related art, the inventor provides a compression clamp which uses a hydraulic cylinder as a driving source for clamping a spline, and can effectively ensure the balance of the output clamping force of the hydraulic cylinder, so that the loading center of the clamping force applied to two ends of the spline and the center of the spline are on the same straight line, and the authenticity and the reliability of the compression strength test of a composite material under the condition of large load are ensured. However, when the spline is required to be tested in a high-temperature and low-temperature environment, the high-temperature and low-temperature environment can affect the work of the hydraulic cylinder, so that the hydraulic cylinder cannot provide stable power, the clamping of the spline is unstable, and the accuracy of a test result is finally affected.
In view of the above problems, the present inventors have actively researched and innovated based on practical experience and professional knowledge that is abundant over years in engineering application of such products, in order to create a high-low temperature hydraulic pressure and large load compression test system for composite materials, so that the system has higher practicability.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the high-low temperature hydraulic large-load compression test system for the composite material is provided to solve the test problem of hydraulic pressure at high and low temperatures.
In order to achieve the purpose, the invention adopts the technical scheme that: a high and low temperature hydraulic large load compression test system for composite materials comprises:
the high-low temperature environment box is internally provided with an accommodating cavity and is provided with a top surface opening, a bottom surface opening and a side surface opening;
the compression clamp comprises an upper clamping seat and a lower clamping seat which are oppositely arranged in the vertical direction, the upper clamping seat and the lower clamping seat are arranged in the high-temperature and low-temperature environment box, and the upper clamping seat and the lower clamping seat are relatively far away or close to each other under the action of external force;
the upper clamping seat and the lower clamping seat are respectively provided with a cavity, the two cavities respectively comprise first opening ends which are oppositely arranged, a movable clamping block and a fixed clamping block which are oppositely arranged in the horizontal direction are arranged in the two cavities, and the fixed clamping blocks are fixed on the inner wall of the cavities;
the outer side walls of the upper clamping seat and the lower clamping seat are respectively provided with a transverse driving assembly, the transverse driving assemblies are used for driving the movable clamping blocks to be close to or far away from the fixed clamping blocks, and each transverse driving assembly comprises a transmission rod, a hydraulic cylinder and a sleeve;
the sleeve penetrates through the side opening, the top end of the sleeve is fixed to the side walls of the upper clamping seat and the lower clamping seat, the bottom of the sleeve is arranged outside the high-low temperature environment box, the hydraulic cylinder is fixed to the bottom in the sleeve, one end of the hydraulic cylinder is connected with the hydraulic cylinder, and the other end of the hydraulic cylinder penetrates through the outer side wall and then is connected with the movable clamping block.
Furthermore, the high and low temperature environment box also comprises a front opening end, the side opening is arranged on one side of the front opening end, and the top opening, the bottom opening and the side opening are all arranged in a penetrating way with the front opening end so as to facilitate the placement of the compression clamp;
and the intelligent hydraulic control unit is connected with the hydraulic cylinder and is used for controlling the pressure of the hydraulic cylinder to change along with the load during compression test.
Further, the high and low temperature environment box further comprises an upper patch, a lower patch and a side patch, wherein the size of the upper patch is matched with the through part with the open top surface, the lower patch is matched with the through part with the open bottom surface, the side patch is matched with the through part with the open side surface, and the upper patch, the lower patch and the side patch are respectively embedded at the through parts with the open top surface, the open bottom surface and the open side surface through a lug and sliding groove structure.
Furthermore, the two cavities of the upper clamping seat and the lower clamping seat are also provided with second open ends, and the opening directions of the two second open ends are the same as the opening direction of the front open end.
Further, the transverse driving assembly further comprises a linear bearing, the linear bearing is arranged in the sleeve, and the transmission rod penetrates through the linear bearing.
Furthermore, a groove is formed in the end face, facing the movable clamping block, of the transmission rod, a protruding portion is arranged on the face, facing the transmission rod, of the movable clamping block, the protruding portion is embedded into the groove, and the end face of the protruding portion and the bottom face of the groove are of a spherical contact structure.
Furthermore, the lower clamping seat is also provided with at least two guide posts towards the moving direction of the upper clamping seat, and the upper clamping seat penetrates through the guide posts.
Furthermore, the top of going up the holder is connected with coupling assembling, holder bottom is fixed with down the connecting seat down, the top of going up coupling assembling passes the top surface opening sets up, the bottom of connecting seat passes down the bottom surface opening sets up.
Further, go up coupling assembling including fixing the balancing stand of going up the holder top surface and with the last connecting seat that the balancing stand is connected, the balancing stand center is the sphere arch, go up the connecting seat bottom with the face that the balancing stand contacted sets up to corresponding concave spherical shape.
Further, an inner clamping block is further arranged in the cavity and fixed on the inner wall opposite to the second opening end.
Furthermore, the inner clamping block is provided with a boss facing the second opening end, and the boss extends into a clamping area between the movable clamping block and the fixed clamping block.
The invention has the beneficial effects that: according to the invention, through the arrangement of the high-low temperature environment box, a low-temperature environment is formed by filling liquid nitrogen into the high-low temperature environment box, or a high-temperature environment is formed by the automatic heating function of the environment box, and through the side opening arranged on the high-low temperature environment box, the hydraulic cylinder playing a driving role is isolated outside the high-low temperature environment box through the connection of the transmission rod and the sleeve, so that the influence of the high-low temperature environment on hydraulic oil is reduced, the smooth performance of a large-load compression test of the composite material in the low-temperature environment is ensured, and the accuracy of a test result is improved;
the front opening end, the top opening, the bottom opening and the side opening of the high and low temperature environment box are arranged in a penetrating manner, so that the high and low temperature environment box is quickly assembled, the high and low temperature environment box is loaded when a high and low temperature environment test is needed, and the high and low temperature environment box is taken down in a transverse moving manner when the high and low temperature environment test is not needed, and the adaptability of the device is improved;
the arrangement of the upper patch, the lower patch and the side patch slows down the diffusion speed of the temperature in the high-low temperature environment box, and the arrangement of the convex block and the sliding groove improves the assembly precision and efficiency;
according to the invention, the sample strip can be conveniently observed during the test through the second opening ends arranged on the upper clamping seat and the lower clamping seat, and the sample strip can be conveniently installed and taken down;
according to the invention, through the arrangement of the linear bearing and the guide post, the force application accuracy of the compression test is improved; and, be connected through the transfer line with the magnetism that removes the clamp splice, and go up the spherical contact of connecting seat and balancing stand in vertical direction, it has stability to have guaranteed to remove the relative motion between clamp splice and the fixed clamp splice, realized the depth of parallelism and the equilibrium of pneumatic cylinder power output of the clamp surface of removing clamp splice and fixed clamp splice when experimental, the loading center and the spline of the clamp force that finally effectual both ends of having guaranteed the spline received are on same straight line, and through the setting of intelligent hydraulic control unit, make in the compression test process, the clamping force that the spline received increases along with the increase of load, thereby make the authenticity and the reliability of the big load compression test's of spline under low temperature environment or high temperature environment compressive strength higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a composite high and low temperature hydraulic large load compression test system according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1 in accordance with an embodiment of the present invention;
FIG. 3 is a sectional view taken along line B-B of FIG. 2 in accordance with an embodiment of the present invention;
FIG. 4 is an exploded view of the high and low temperature environment chamber and compression fixture in accordance with an embodiment of the present invention;
FIG. 5 is an exploded view of the compression clamp in an embodiment of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 5 at C in accordance with an embodiment of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 5 at D in accordance with an embodiment of the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 3 at E in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of the overall structure of the composite high and low temperature hydraulic large load compression test system according to the embodiment of the present invention;
FIG. 10 is another embodiment of the high and low temperature environment chamber of the present invention;
FIG. 11 is a control flow diagram of the intelligent hydraulic control unit in an embodiment of the present invention;
FIG. 12 is a control schematic of the hydraulic control module in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The composite material high and low temperature hydraulic large load compression test system shown in fig. 1 to 12 comprises a high and low temperature environment box 100, a compression clamp 200 and an intelligent hydraulic control unit (not shown in the figure), wherein:
the high-low temperature environment box 100 is internally provided with an accommodating cavity 110, and the high-low temperature environment box 100 is provided with a top surface opening 120, a bottom surface opening 130 and a side surface opening 140; the high and low temperature environment box 100 is used for providing high and low temperature environment for the compression test and realizing the temperature insulation function, when in specific test, as shown in fig. 9, the high and low temperature environment box 100 is fixed on a support of the universal material testing machine, and the upper end and the lower end of the compression clamp 200 are respectively connected with the driving end of the universal testing machine to perform the compression test. It should be noted that in the preferred embodiment of the present invention, the compression clamp 200 may be movably disposed along the transverse sliding rail, which may facilitate the installation and the disassembly of the high and low temperature environment box 100, and simplify the test assembly procedure.
Specifically, as shown in fig. 2, the compression clamp 200 includes an upper clamping seat 210 and a lower clamping seat 220 which are oppositely arranged in a vertical direction, the upper clamping seat 210 and the lower clamping seat 220 are arranged in the high-low temperature environment box 100, and the upper clamping seat 210 and the lower clamping seat 220 are relatively far away from or close to each other under the action of external force; it should be noted that the external force is the load applied by the universal material testing machine, the universal material testing machine is the prior art, the detailed description of the specific shape and the configuration of the universal material testing machine is omitted, and the spline with two ends respectively fixed in the upper clamping seat 210 and the lower clamping seat 220 is compressed by the application of the force of the universal material testing machine.
With reference to fig. 2, the upper and lower clamping bases 210 and 220 have cavities 211, each cavity 211 includes first open ends 211a disposed opposite to each other, the cavities 211 have movable clamping blocks 212 and fixed clamping blocks 213 disposed opposite to each other in the horizontal direction, and the fixed clamping blocks 213 are fixed on the inner walls of the cavities 211; in particular, when clamping is performed, the sample strip is vertically placed between the movable clamping block 212 and the fixed clamping block 213, and the sample strip is fixed between the movable clamping block 212 and the fixed clamping block 213 by pushing the movable clamping block to approach the fixed clamping block;
regarding the driving structure of the movable clamping block 212, as shown in fig. 2 and 3, the outer side walls of the upper clamping seat 210 and the lower clamping seat 220 are respectively provided with a transverse driving assembly 230, the transverse driving assembly 230 is used for driving the movable clamping block 212 to approach or separate from the fixed clamping block 213, and the transverse driving assembly 230 comprises a transmission rod 231, a hydraulic cylinder 232 and a sleeve 233;
the sleeve 233 penetrates through the side opening 140, the top end of the sleeve 233 is fixed to the side walls of the upper clamping seat 210 and the lower clamping seat 220, the bottom of the sleeve is arranged outside the high and low temperature environment box 100, the hydraulic cylinder 232 is fixed to the bottom inside the sleeve 233, one end of the hydraulic cylinder 232 is connected with the hydraulic cylinder 232, and the other end of the hydraulic cylinder 232 penetrates through the outer side wall and then is connected with the movable clamping block 212.
With reference to fig. 9, the intelligent hydraulic control unit is connected to the hydraulic cylinder 232, and is used to control the pressure of the hydraulic cylinder 232 to follow the load change during the compression test. It should be noted here that the pressure variation following the load means that the clamping force of the hydraulic cylinder 232 increases when the load increases, and the clamping force of the hydraulic cylinder 232 decreases when the load decreases, because in the compression test, the splines are damaged to different degrees due to too large or too small clamping force compared with the load, thereby affecting the test result.
In the embodiment of the present invention, as shown in fig. 11, the hydraulic control unit includes an electrical control module and a hydraulic control module, the electrical control module sets signal output in the compression fixture 200 to feed back the load on the spline in real time, so that the electrical control module sends an instruction to control the hydraulic cylinder 232 to output corresponding pressure, and through the setting, the clamping force output by the hydraulic cylinder 232 and the load are ensured to be intelligently adaptive to each other, thereby ensuring the balance between the clamping force on the spline and the load force.
Referring to fig. 12, in the embodiment of the present invention, an accumulator group is connected to the hydraulic control module through a power unit, two oil paths are output through the accumulator group, and the hydraulic cylinders 232 are connected to the two oil paths through the reversing valves and the check valves, respectively, to form a single hydraulic control group.
The sleeve 233 has the functions of reducing high and low temperature transmission in the isolation box on one hand, and extending the position of the hydraulic cylinder 232 to the outside of the environmental box through the transmission rod 231 structure through the sleeve 233 on the other hand, so that the influence of the high and low temperature hydraulic cylinder 232 is further reduced through the change of the position of the hydraulic cylinder 232;
in the above embodiment, the low temperature environment is formed by filling liquid nitrogen into the high and low temperature environment box 100, the high temperature environment is formed by the automatic heating function of the environment box, the side opening 140 is formed in the high and low temperature environment box 100, and the hydraulic cylinder 232 which plays a driving role is isolated outside the high and low temperature environment box 100 through the connection of the transmission rod 231 and the sleeve 233, so that the influence of the high and low temperature environment on hydraulic oil is reduced, the smooth performance of a large-load compression test of the composite material in the low temperature environment is ensured, and the accuracy of the test result is improved.
In order to improve the adaptability of the high and low temperature environment box 100, as shown in fig. 4, the high and low temperature environment box 100 further includes a front opening 150, a side opening 140 is disposed at one side of the front opening 150, and the top opening 120, the bottom opening 130 and the side opening 140 are disposed to penetrate the front opening 150, so as to facilitate the placement of the compression clamp 200. When specifically using, can set up the slider in high low temperature environment case 100 bottom, set up the track that suits with the slider on universal material testing machine's support, the track orientation is close to or is kept away from the direction removal of compression anchor clamps 200, has realized the rapid Assembly of high low temperature environment case 100 through the aforesaid setting, loads high low temperature environment case 100 when needs high low temperature environment is experimental, takes off through the mode of sideslip when not needing, has improved device adaptability. Of course, in order to improve the heat insulating property of the high/low temperature environment box 100, a hinged door may be opened at the front opening end 150, and the door may be opened during the lateral movement.
With reference to fig. 4, in the embodiment of the present invention, in order to compensate for the temperature leakage caused by the penetration of the top opening 120, the bottom opening 130 and the side opening 140, the high and low temperature environment box 100 further includes an upper patch 121, a lower patch 131 and a side patch 141, wherein the upper patch 121 has a size corresponding to the penetration portion of the top opening 120, the lower patch 131 corresponds to the penetration portion of the bottom opening 130, the side patch 141 corresponds to the penetration portion of the side opening 140, and the upper patch 121, the lower patch 131 and the side patch 141 are respectively embedded in the penetration portions of the top opening 120, the bottom opening 130 and the side opening 140 through a bump-and-slide structure. Specifically, a sliding groove is arranged on the side wall of the through part, and convex blocks are arranged at corresponding positions of the upper patch 121, the lower patch 131 and the side patch 141, and when the device is installed, all the patch blocks are pushed in through the positioning of the convex blocks; it should be noted here that the space for the lateral drive mechanism to move and the hole sites for the top and bottom surfaces to be connected to the universal material testing machine are left after the insertion. In addition, in the embodiment of the present invention, the high and low temperature environment box 100 is provided with two purposes, as shown in fig. 10, and there is no hole on the side patch 141, and by this arrangement, it is possible to continue to use the high and low temperature environment box 100 during other compression tests without extending out of the high and low temperature environment box 100, and by this arrangement, the utilization rate of the high and low temperature environment box 100 is improved.
In order to increase the assembling speed of the spline and facilitate observing the state of the spline during the experiment, please continue to refer to fig. 4, the cavities 211 of the upper and lower clamping holders 210 and 220 further have second open ends 211b, and the opening directions of the second open ends 211b are the same as the opening direction of the front open end 150. With this arrangement, the spline can be directly loaded between the movable clamp block 212 and the fixed clamp block 213 in the high and low temperature environment chamber 100, and the state of the spline can also be directly observed.
To improve the accuracy of the lateral driving of the hydraulic cylinder 232, as shown in fig. 2, 3 and 5, the lateral driving assembly 230 further includes a linear bearing 234, the linear bearing 234 is disposed in the sleeve 233, and the transmission rod 231 is disposed through the linear bearing 234. Through the arrangement of the linear bearing 234, on one hand, a guiding function is provided, so that the offset when the movable clamping block 212 is pushed is reduced, on the other hand, the friction force when the transmission rod 231 moves is also reduced, and the service life of the device is prolonged.
In the embodiment of the present invention, in order to improve the balance of the force applied by the transmission rod 231, a groove 231a is provided on the end surface of the transmission rod 231 facing the movable clamping block 212, a protrusion 212a is provided on the surface of the movable clamping block 212 facing the transmission rod 231, the protrusion 212a is embedded into the groove 231a, and the end surface of the protrusion 212a and the bottom surface of the groove 231a are in a spherical contact structure. It should be noted here that the side wall of the protrusion 212a is connected with the side wall of the groove 231a through clearance fit, the top of the protrusion 212a and the bottom of the groove 231a are arc-shaped surfaces, and the two arc-shaped surfaces are attached to each other, so that the stability of connection between the transmission rod 231 and the movable clamping block 212 when outputting power is ensured, and the balance of power output is improved.
In addition, a magnet is adopted for connection between the transmission rod 231 and the hydraulic cylinder 232, as shown in fig. 2 and 3, a permanent magnet is arranged between the transmission rod 231 and the hydraulic cylinder 232, the transmission rod 231 and the hydraulic cylinder 232 are connected together through the magnetic field of the permanent magnet, and through the arrangement, the transmission rod 231 is not restrained in other directions, so that the stability of the transmission rod 231 in the force transmission process is improved.
In addition, in order to reduce the deflection of the splines in the vertical direction during the test, an inner clamp block 217 is further provided in the embodiment of the present invention, and as shown in fig. 3 and 8, the inner clamp block 217 is provided between the moving clamp block 212 and the fixed clamp block 213 and fixed to the inner wall opposite to the second open end 211 b. Through the arrangement of the inner clamping block 217, the spline is supported by the inner clamping block 217 besides clamping the spline by the side walls of the movable clamping block 212 and the fixed clamping block 213 in the vertical direction, so that the spline is prevented from being deviated in the front-back direction in the test process, the spline is always in a vertical state, and the test success rate and the test result consistency are improved.
Further, in order to increase the variety of spline clamping, as shown in fig. 8, in the embodiment of the present invention, the inner clamp block 217 is provided with a boss 217a in a direction toward the second open end 211b, and the boss 217a protrudes into the clamping area between the moving clamp block 212 and the fixed clamp block 213. When the splines with different thicknesses are clamped, the contact area between the inner clamping block 217 and the splines is reduced through the arrangement of the boss 217a, the adjustable space between the movable clamping block 212 and the fixed clamping block 213 is increased, and the position of the boss 217a is deviated to the arrangement of the fixed clamping block 213.
In the embodiment of the present invention, in order to improve the stability of the vertical movement, as shown in fig. 5, at least two guide posts 221 are further disposed on the lower clamp 220 in the movement direction of the upper clamp 210, and the upper clamp 210 is disposed through the guide posts 221.
Further, with reference to fig. 5, the top of the upper holder 210 is connected to an upper connecting assembly 215, the bottom of the lower holder 220 is fixed to a lower connecting seat 216, the top of the upper connecting assembly 215 is disposed through the top opening 120, and the bottom of the lower connecting seat 216 is disposed through the bottom opening 130. The top opening 120 and the bottom opening 130 also have a certain guiding function by the arrangement that the upper connecting component 215 passes through the top opening 120 and the bottom of the lower connecting seat 216 passes through the bottom opening 130.
In order to improve the balance of the vertical force, as shown in fig. 7, in the embodiment of the present invention, the upper connecting assembly 215 and the upper holder 210 adopt a spherical connecting structure, specifically, the upper connecting assembly 215 includes a balance stage 215a fixed on the top surface of the upper holder 210 and an upper connecting base 215b connected to the balance stage 215a, the center of the balance stage 215a is a spherical protrusion, and the surface of the bottom of the upper connecting base 215b contacting the balance stage 215a is set to be a corresponding concave spherical shape. Through the arrangement of the spherical connection structure, point loads loaded from the universal material testing machine are converted into surface loads through a balanced state, and therefore the force application balance during compression is improved.
It should be noted that the structure is also applicable to the use of the pneumatic cylinder in high and low temperature environments.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (11)
1. The utility model provides a big load compression test system of combined material high low temperature hydraulic pressure which characterized in that includes:
the high-low temperature environment box is internally provided with an accommodating cavity and is provided with a top surface opening, a bottom surface opening and a side surface opening;
the compression clamp comprises an upper clamping seat and a lower clamping seat which are oppositely arranged in the vertical direction, the upper clamping seat and the lower clamping seat are arranged in the high-temperature and low-temperature environment box, and the upper clamping seat and the lower clamping seat are relatively far away or close to each other under the action of external force;
the upper clamping seat and the lower clamping seat are respectively provided with a cavity, the two cavities respectively comprise first opening ends which are oppositely arranged, a movable clamping block and a fixed clamping block which are oppositely arranged in the horizontal direction are arranged in the two cavities, and the fixed clamping blocks are fixed on the inner wall of the cavities;
the outer side walls of the upper clamping seat and the lower clamping seat are respectively provided with a transverse driving assembly, the transverse driving assemblies are used for driving the movable clamping blocks to be close to or far away from the fixed clamping blocks, and each transverse driving assembly comprises a transmission rod, a hydraulic cylinder and a sleeve;
the sleeve penetrates through the side opening, the top end of the sleeve is fixed on the side walls of the upper clamping seat and the lower clamping seat, the bottom of the sleeve is arranged outside the high-low temperature environment box, the hydraulic cylinder is fixed at the bottom in the sleeve, one end of the hydraulic cylinder is connected with the hydraulic cylinder, and the other end of the hydraulic cylinder penetrates through the outer side wall and then is connected with the movable clamping block;
and the intelligent hydraulic control unit is connected with the hydraulic cylinder and is used for controlling the pressure of the hydraulic cylinder to change along with the load during compression test.
2. The composite high and low temperature hydraulic high load compression test system according to claim 1, wherein the high and low temperature environment box further comprises a front opening end, the side opening is disposed at one side of the front opening end, and the top opening, the bottom opening and the side opening are all disposed in a penetrating manner with the front opening end so as to facilitate placement of the compression clamp.
3. The composite high and low temperature hydraulic high load compression test system of claim 2, wherein the high and low temperature environmental chamber further comprises an upper patch, a lower patch and a side patch, the upper patch being sized to fit the top surface open through-portion, the lower patch fitting the bottom surface open through-portion, the side patch fitting the side surface open through-portion, the upper patch, the lower patch and the side patch being embedded at the top surface open through-portion, the bottom surface open through-portion and the side open through-portion by a bump-and-groove structure, respectively.
4. The composite material high and low temperature hydraulic large load compression test system according to claim 2, wherein the two cavities of the upper and lower clamping bases further have second open ends, and the opening directions of the two second open ends are the same as the opening direction of the front open end.
5. The composite high and low temperature hydraulic high load compression test system of claim 1, wherein the transverse drive assembly further comprises a linear bearing disposed within the sleeve and through which the drive rod is disposed.
6. The composite material high and low temperature hydraulic large load compression test system according to claim 5, wherein a groove is formed in an end surface of the transmission rod facing the movable clamping block, a protrusion is arranged on a surface of the movable clamping block facing the transmission rod and embedded into the groove, and the end surface of the protrusion and the bottom surface of the groove are in a spherical contact structure.
7. The composite high and low temperature hydraulic high load compression test system according to claim 1, wherein the lower clamp holder is further provided with at least two guide posts in a moving direction towards the upper clamp holder, and the upper clamp holder is arranged through the guide posts.
8. The composite high and low temperature hydraulic high load compression test system according to claim 7, wherein an upper connection assembly is connected to the top of the upper clamping base, a lower connection base is fixed to the bottom of the lower clamping base, the top of the upper connection assembly is disposed through the top surface opening, and the bottom of the lower connection base is disposed through the bottom surface opening.
9. The composite high and low temperature hydraulic large load compression test system according to claim 8, wherein the upper connection assembly comprises a balance table fixed on the top surface of the upper holder and an upper connection seat connected with the balance table, the center of the balance table is a spherical protrusion, and the surface of the bottom of the upper connection seat contacting with the balance table is set to be a corresponding concave spherical shape.
10. The composite high and low temperature hydraulic high load compression test system of claim 4, wherein an inner clamp block is further disposed within the cavity, the inner clamp block being secured to an inner wall opposite the second open end.
11. The composite high and low temperature hydraulic high load compression test system according to claim 10, wherein the inner clamp block is provided with a boss in a direction towards the second open end, the boss extending into a clamping area between the movable clamp block and the fixed clamp block.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011253757.3A CN112378778B (en) | 2020-11-11 | 2020-11-11 | High-low temperature hydraulic large-load compression test system for composite material |
| PCT/CN2020/133907 WO2022099830A1 (en) | 2020-11-11 | 2020-12-04 | High-low-temperature hydraulic large-load compression test system for composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011253757.3A CN112378778B (en) | 2020-11-11 | 2020-11-11 | High-low temperature hydraulic large-load compression test system for composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112378778A CN112378778A (en) | 2021-02-19 |
| CN112378778B true CN112378778B (en) | 2021-08-10 |
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| US5095757A (en) * | 1991-02-04 | 1992-03-17 | Mts Systems Corporation | Specimen grip with remote actuation |
| DE102010034290A1 (en) * | 2010-08-13 | 2012-02-16 | Schaeffler Technologies Gmbh & Co. Kg | Pressure-limited hydraulically damped clamping system |
| CN104458405A (en) * | 2014-12-03 | 2015-03-25 | 浙江大学 | Dynamic sealing structure of material tester resistant to high-low temperature high-pressure hydrogen gas environment |
| CN105043976B (en) * | 2015-07-28 | 2017-10-31 | 南京航空航天大学 | The experimental rig and test method of the secondary coefficient of friction of fine motion during a kind of dynamic measurement fretting fatigue |
| RU2678935C1 (en) * | 2018-04-17 | 2019-02-04 | Общество с ограниченной ответственностью "ЗИМ Точмашприбор" | Servo-hydraulic universal testing machine for mechanical testing of samples of materials in tension, compression, bending and low cycle fatigue in tension-compression |
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| CN211061345U (en) * | 2019-12-09 | 2020-07-21 | 济南联工测试技术有限公司 | High-low temperature environment lasting tensile testing machine |
| CN211652336U (en) * | 2019-12-11 | 2020-10-09 | 武汉华中科大土木工程检测中心 | Clamp system for geosynthetic material test |
| CN211856162U (en) * | 2020-03-04 | 2020-11-03 | 常州达姆斯检测技术有限公司 | Super-load hydraulic compression clamp |
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