CN113092270A - High-precision electro-hydraulic servo universal testing machine - Google Patents
High-precision electro-hydraulic servo universal testing machine Download PDFInfo
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- CN113092270A CN113092270A CN202110359734.9A CN202110359734A CN113092270A CN 113092270 A CN113092270 A CN 113092270A CN 202110359734 A CN202110359734 A CN 202110359734A CN 113092270 A CN113092270 A CN 113092270A
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- 238000012360 testing method Methods 0.000 title abstract description 19
- 238000003780 insertion Methods 0.000 claims abstract description 6
- 230000037431 insertion Effects 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 85
- 238000007789 sealing Methods 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 2
- 238000012669 compression test Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N3/02—Details
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of testing devices, in particular to a high-precision electro-hydraulic servo universal testing machine which comprises an upright post, an upper cross beam and a base, wherein the upper cross beam and the base are connected with the upright post, two ends of the upright post are respectively provided with an insertion block I, the upper cross beam and the base are respectively provided with a slot I matched with the insertion block I, the end part of the upright post is in threaded connection with a nut I, the periphery of the nut I is provided with a screw hole and is in threaded connection with a bolt I, and the upper cross beam and the base are provided with screw holes I matched with the bolt I, and the high: the stand, the upper cross beam and the base are tightened by bolts to eliminate gaps, so that a gapless mounting structure of the universal machine is realized, and the stability of test piece detection is improved.
Description
Technical Field
The invention relates to the field of testing devices, in particular to a high-precision electro-hydraulic servo universal testing machine.
Background
The universal tester is a precision tester which can measure the mechanical properties and technological properties of metal materials, non-metal materials, mechanical parts and the like under various conditions and environments. The existing universal machine still has the following defects: there is the installation clearance between stand and entablature or the base, has the installation clearance between hydro-cylinder piston and the mount pad of keeping silent, leads to the initial stage of test piece test can be unstable.
Disclosure of Invention
The invention aims to provide a high-precision electro-hydraulic servo universal testing machine, which is used for realizing a gapless structure of a universal machine and improving the stability of detection.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a servo universal tester of high accuracy electricity liquid, includes the stand, the entablature and the base of being connected with the stand, the both ends of stand all are equipped with inserted block one, all be equipped with on entablature and the base with inserted block assorted slot one, the tip threaded connection of stand has nut one, has seted up through-hole one in the circumference of nut one, is equipped with bolt one in the through-hole one, set up on entablature and the base with bolt one assorted screw one.
The hydraulic wrench further comprises a lower jaw seat, a main oil cylinder is arranged between the lower jaw seat and the base, an insert block II is arranged at the piston end of the main oil cylinder, a nut II is in threaded connection with the piston end, a through hole II is formed in the circumferential direction of the nut II, a bolt II is arranged in the through hole II, and a slot II matched with the insert block II and a screw hole II matched with the bolt II are formed in the lower jaw seat.
Further, the master cylinder comprises a master cylinder cover, a confluence groove and a plurality of sealing element mounting grooves are sequentially arranged on the master cylinder cover from outside to inside, a flow channel is formed in the cylinder cover, one end of the flow channel is communicated with the confluence groove, and the other end of the flow channel is communicated with the outside.
Further, including last jaw seat, go up and be equipped with the sensor between jaw seat and the entablature, the sensor includes the spliced pole, and the upper end circumference of spliced pole extends and forms the connection pad, and the lower extreme is equipped with the cross beam, the central part of cross beam and the terminal surface integrated into one piece under the spliced pole leave the space between the roof beam portion of cross beam and the terminal surface under the spliced pole, be equipped with the go-between with cross beam end integrated into one piece in the periphery of cross beam, the lower terminal surface protrusion in the lower terminal surface of cross beam of go-between, all be equipped with the foil gage on four roof beam portion lateral walls of cross beam, screw three has all been seted up in the circumference of go.
Furthermore, a threading channel is formed inside the connecting column.
Furthermore, the connecting column, the connecting disc, the cross beam and the connecting ring are all made of alloy steel.
Further, the hydraulic control device comprises an oil tank and an oil pump, wherein the upper jaw seat and the lower jaw seat are respectively provided with a jaw oil cylinder, a jaw oil cylinder control oil circuit is arranged between the jaw oil cylinder and the oil pump, a master oil cylinder control loop is arranged between the master oil cylinder and the oil pump, and the jaw oil cylinder control loop is provided with a pressure reducing valve.
Furthermore, the oil pump comprises an oil pump I and an oil pump II, the oil pump is output in two paths, one path of the oil pump is used for supplying a jaw oil cylinder control oil path, the other path of the oil pump is used for supplying a master oil cylinder control loop, and the output of the oil pump II is used for supplying the master oil cylinder control loop.
The invention has the advantages that:
1. gaps are eliminated among the upright columns, the upper cross beam and the base through bolt tensioning, and the gaps are eliminated between the main oil cylinder piston and the lower jaw through bolt tensioning, so that a gapless mounting structure of the universal machine is realized, and the stability of test piece detection is improved;
2. the cross beam structure is used as the mounting part of the strain gauge of the sensor, so that the consistency of deformation under tension and compression stress is realized, and the consistency of the tension and compression sensitivity of the sensor is ensured; meanwhile, through experimental tests, when the stress position changes, the difference of the electric signals generated by the cross beam type sensor is far smaller than that of the electric signals generated by the columnar sensor, so that the sensor is ensured to have better lateral resistance;
3. the hydraulic system has two pressures, so that the jaw oil cylinder and the main oil cylinder are controlled by the same hydraulic system, the hydraulic system of a universal machine is simplified, and the cost is reduced; meanwhile, the hydraulic system adopts the design of arranging the main oil cylinder at the lower part, and compared with the existing scheme of arranging the main oil cylinder at the upper part, the safety and the stability of the universal machine are greatly improved;
4. the most outside of the oil cylinder cover of the main oil cylinder is provided with a confluence groove, hydraulic oil seeped out from the sealing piece is converged into the confluence groove and then returns to the oil tank through a flow passage, and leaked oil is recycled.
Drawings
FIG. 1 is a schematic front view of a universal machine in an embodiment;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
FIG. 4 is a schematic sectional view of the master cylinder in the embodiment;
FIG. 5 is a schematic illustration of a hydraulic system in an embodiment;
FIG. 6 is a schematic configuration diagram of a sensor in the embodiment;
FIG. 7 is an enlarged view of the portion C of FIG. 6;
FIG. 8 is a schematic top view of a sensor in an embodiment;
FIG. 9 is a schematic front view of a sensor in an embodiment;
description of the reference symbols
The hydraulic oil cylinder comprises a stand column 1, an upper cross beam 2, a base 3, a first insert block 4, a first slot 5, a first nut 6, a first bolt 7, a lower jaw seat 8, a main oil cylinder 9, a second insert block 10, a second slot 11, a second nut 12, a second bolt 13, a main oil cylinder cover 14, a sealing element mounting groove 15, a confluence groove 16, a flow passage 17, an upper jaw seat 18, a sensor 19, a connecting column 20, a connecting disc 21, a cross beam 22, a connecting ring 23, a third screw hole 24, an oil tank 25, a first oil pump 26, a filter 27, an electromagnetic reversing valve 28, a throttle valve 29, an overflow valve 30, a pressure reducing valve 31, a jaw oil cylinder 32 and a.
Detailed Description
The present invention will be described in further detail with reference to examples.
The embodiment provides a servo universal tester of high accuracy electricity liquid, as shown in fig. 1 to 3, including stand 1, the entablature 2 and the base 3 of being connected with stand 1, the both ends of stand 1 all are equipped with inserted block one 4, all be equipped with on entablature 2 and the base 3 with inserted block one 4 assorted slots one 5, the tip threaded connection of stand 1 has nut one 6, has seted up through-hole one in the circumference of nut one 6, is equipped with bolt one 7 in the through-hole one, set up on entablature 2 and the base 3 with bolt one 7 assorted screw one. During installation, the first nut 6 is screwed into the upright post 1, then the upright post 1 is fixed with the upper cross beam 2 and the base 3 through insertion, a gap is reserved between the first nut 6 and the upper cross beam 2 or the base 3, then the first bolt 7 on the first nut 6 is screwed into the first screw hole, and the gap is eliminated through the tensioning effect of the first bolt 7. Omnipotent machine includes jaw seat 8 down, is equipped with master cylinder 9 between jaw seat 8 and the base 3 down, because in the structure that has now, there is the clearance equally with being connected between the jaw seat master cylinder piston, so the structure that this embodiment utilized stand 1 department has carried out following design: the piston end part of the main oil cylinder 9 is provided with a second insert block 10, the piston end part is in threaded connection with a second nut 12, the second nut 12 is circumferentially provided with a second through hole, the second through hole is internally provided with a second bolt 13, and the lower jaw seat 8 is provided with a second slot 11 matched with the second insert block 10 and a second screw hole matched with the second bolt 13. And the installation gap between the end surface of the piston and the lower jaw seat 8 is eliminated through the tensioning action of the screw hole II. Meanwhile, the design that the master cylinder 9 of the universal machine is arranged at the bottom greatly improves the safety and stability of the universal machine compared with the existing scheme that the master cylinder 9 is arranged at the top.
As shown in fig. 4, the master cylinder 9 includes a cylinder body and a master cylinder head 14, and in order to increase the sealing performance, a plurality of sealing member installation grooves 15 are provided on the master cylinder head 14 in the prior art, and the sealing performance of the master cylinder head 14 is improved by installing a sealing member. Although the sealing element is arranged, hydraulic oil inevitably seeps out, and in order to solve the defect, the confluence groove 16 is formed in the sealing element mounting groove 15 of the main cylinder cover 14, the main cylinder cover 14 is provided with the flow passage 17, one end of the flow passage 17 is communicated with the confluence groove 16, and the other end of the flow passage 17 is used for being communicated with an external oil tank 25. The hydraulic oil thus leaked from the seal is collected in the collecting groove 16 and then returned to the oil tank 25 through the flow passage 17, thereby achieving recovery of the leaked oil.
When the universal machine is used for testing the tensile and compressive stress of a test piece, the tensile and compressive stress is mainly detected by the sensor 19, so the accuracy of the sensor 19 determines the quality of a test result. The conventional universal tester sensor 19 mainly uses a column-shaped sensor 19, but the sensor 19 has the following defects: when the tension and compression test is carried out, the tension and compression deformation of the columnar sensor 19 is different, so that the tension and compression sensitivity of the sensor 19 is inconsistent, and meanwhile, when the stress position of the columnar sensor 19 is changed, the generated electric signal difference is overlarge, so that the improvement of the detection precision of a universal machine is not facilitated.
As shown in fig. 6 to 9, the present embodiment provides a sensor 19 for a high-precision electro-hydraulic servo universal tester, which includes a connection column 20, wherein an upper end of the connection column 20 extends circumferentially to form a connection pad 21, a cross beam 22 is disposed at a lower end of the connection column 20, a central portion of the cross beam 22 and a lower end face of the connection column 20 are integrally formed, a gap is left between a beam portion of the cross beam 22 and a lower end face of the connection column 20, a connection ring 23 integrally formed with a beam end of the cross beam 22 is disposed on an outer periphery of the cross beam 22, a lower end face of the connection ring 23 protrudes out of the lower end face of the cross beam 22, strain gauges are disposed on side walls of four beam portions of the cross beam 22, and three. Meanwhile, in order to facilitate threading, a threading channel (not shown in the figure) is formed inside the connecting column 20, and the data lines on the strain gauge can be connected through the threading channel.
As shown in FIG. 1, the sensor 19 is applied to a universal machine, and needs to be matched with the installation position of an original cylindrical sensor, so that the outer diameters of the connecting ring 23 and the connecting disc 21 need to be set to be the same, the outer diameters of the connecting ring 23 and the connecting disc 21 are the same as the outer diameter of the original cylindrical sensor, the three screw holes 24 in the connecting ring 23 are opposite to the three screw holes 24 in the connecting disc 21, and the positions of the three screw holes 24 correspond to the positions of bolt holes of the original cylindrical sensor, so that the reconstruction cost can be reduced. When the device is installed, the connecting disc 21 is fixed with the upper cross beam 2, and the connecting ring 23 is fixed with the upper jaw seat 18. In order to prevent the sensor 19 from being damaged by the tensile and compressive forces generated during the test of the universal machine, the connecting column 20, the connecting disc 21, the cross beam 22 and the connecting ring 23 of the sensor 19 of the embodiment are all made of alloy steel, and have strong tensile and compressive resistance.
The principle of use of this sensor 19 is as follows: when a pressure test is carried out, the lower jaw seat 8 ascends to extrude a test piece, the pressure is transmitted to the sensor 19 through the upper jaw seat 18, the lower end surface of the connecting ring 23 protrudes out of the lower end surface of the cross beam 22, so that the pressure acts on the connecting ring 23, the connecting ring 23 is pressed to drive the beam part of the cross beam 22 to deform upwards (the space between the beam part of the cross beam 22 and the lower end surface of the connecting column 20 meets the space for the upward deformation of the beam part), and the strain gauge can measure and calculate the pressure stress; similarly, when the tensile test is performed, the connection ring 23 is pulled, so that the beam portion is deformed downward to measure the tensile stress. Because the cross beam 22 is pulled and pressed by the connecting ring 23, the pulling and pressing deformation is only different in direction for the cross beam 22, and therefore the consistency of the pulling and pressing sensitivity of the sensor 19 is ensured.
In addition, this embodiment has still reformed transform the hydraulic system of universal machine, because the universal machine including master cylinder 9 and the hydro-cylinder 33 of keeping silent, keep silent the hydro-cylinder 33 including last hydro-cylinder of keeping silent and the hydro-cylinder of keeping silent down, because the pressure of the hydro-cylinder 32 of keeping silent is different with master cylinder 9 pressure, so need adopt many sets of hydraulic system to satisfy during current design. As shown in fig. 5, the hydraulic system of the present embodiment includes an oil tank 25 and a first oil pump 26, a jaw cylinder control oil path is provided between the jaw cylinder 32 and the first oil pump 26, and a master cylinder 9 control circuit is provided between the master cylinder 9 and the first oil pump 26. The jaw control loop sequentially comprises an overflow valve, a throttle valve, a pressure reducing valve 31, a one-way valve, an electromagnetic directional valve for the upper jaw oil cylinder 32, an electromagnetic directional valve for the lower jaw oil cylinder 32 and the overflow valve from the oil pump I26, and the main oil cylinder 9 control loop comprises the electromagnetic directional valve and the overflow valve. One path of hydraulic oil output from the first oil pump 26 can be output to the main oil cylinder 9, and the other path of hydraulic oil is output to the jaw oil cylinder 32 after being decompressed by the decompression valve 32, so that the same hydraulic system can output two kinds of pressure through the decompression valve 32, and meanwhile, the pressure of the jaw can be kept stable by the decompression valve 32.
Because the master cylinder 9 needs a larger oil pressure to complete the test, the present embodiment further includes a second oil pump 33, a control circuit of the master cylinder 9 is also provided between the second oil pump and the master cylinder 9, and when the first oil pump 26 supplies oil to the master cylinder 9, the second oil pump 33 works to supply oil to the master cylinder 9 at the same time.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. The utility model provides a servo universal tester of high accuracy electricity liquid, includes stand, entablature and base be connected with the stand, its characterized in that: the two ends of the stand column are provided with first insertion blocks, the upper cross beam and the base are provided with first insertion grooves matched with the first insertion blocks, the end portion of the stand column is connected with first nuts in a threaded mode, first through holes are formed in the first nuts in the circumferential direction, first bolts are arranged in the first through holes, and first screw holes matched with the first bolts are formed in the upper cross beam and the base.
2. The high-precision electro-hydraulic servo universal tester as claimed in claim 1, comprising a lower jaw seat, wherein a main oil cylinder is arranged between the lower jaw seat and a base, and the high-precision electro-hydraulic servo universal tester is characterized in that: the end part of the piston of the main oil cylinder is provided with a second insert block, the end part of the piston is in threaded connection with a second nut, the second nut is circumferentially provided with a second through hole, a second bolt is arranged in the second through hole, and the lower jaw seat is provided with a second slot matched with the second insert block and a second screw hole matched with the second bolt.
3. The high-precision electro-hydraulic servo universal tester as claimed in claim 2, wherein: the master cylinder comprises a master cylinder cover, a confluence groove and a plurality of sealing element mounting grooves are sequentially arranged on the master cylinder cover from outside to inside, a flow channel is formed in the cylinder cover, one end of the flow channel is communicated with the confluence groove, and the other end of the flow channel is communicated with the outside.
4. The high-precision electro-hydraulic servo universal tester as claimed in claim 2, wherein: including last jaw seat, go up and be equipped with the sensor between jaw seat and the entablature, the sensor includes the spliced pole, and the upper end circumference of spliced pole extends and forms the connection pad, and the lower extreme is equipped with the cross beam, end face integrated into one piece under the central part of cross beam and the spliced pole leaves the space under the roof beam portion of cross beam and the spliced pole between the terminal surface, be equipped with the go-between with cross beam roof beam end integrated into one piece in the periphery of cross beam, the lower terminal surface protrusion in the lower terminal surface of cross beam of go-between, all be equipped with the foil gage on four roof beam portion lateral walls of cross beam, screw three has all been seted up in the circumference of.
5. The high-precision electro-hydraulic servo universal tester as claimed in claim 4, wherein: the inside of the connecting column is provided with a threading channel.
6. The high-precision electro-hydraulic servo universal tester as claimed in claim 4, wherein: the connecting column, the connecting disc, the cross beam and the connecting ring are all made of alloy steel.
7. The high-precision electro-hydraulic servo universal tester as claimed in claim 4, wherein: the hydraulic oil pump comprises an oil tank and an oil pump, wherein jaw oil cylinders are arranged on an upper jaw seat and a lower jaw seat, a jaw oil cylinder control oil way is arranged between the jaw oil cylinders and the oil pump, a master oil cylinder control loop is arranged between the master oil cylinder and the oil pump, and a pressure reducing valve is arranged on the jaw oil cylinder control loop.
8. The high-precision electro-hydraulic servo universal tester as claimed in claim 7, wherein: the oil pump comprises an oil pump I and an oil pump II, the oil pump is output in two paths, one path of the oil pump is used for supplying a jaw oil cylinder control oil path, the other path of the oil pump is used for supplying a master oil cylinder control loop, and the output of the oil pump II is used for supplying the master oil cylinder control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359734.9A CN113092270A (en) | 2021-04-02 | 2021-04-02 | High-precision electro-hydraulic servo universal testing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110359734.9A CN113092270A (en) | 2021-04-02 | 2021-04-02 | High-precision electro-hydraulic servo universal testing machine |
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| CN113092270A true CN113092270A (en) | 2021-07-09 |
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| CN202110359734.9A Pending CN113092270A (en) | 2021-04-02 | 2021-04-02 | High-precision electro-hydraulic servo universal testing machine |
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| CN109238527A (en) * | 2018-11-16 | 2019-01-18 | 合肥工业大学 | A kind of cross beam type elastomer for six-dimensional force sensor |
| CN109238531A (en) * | 2018-11-16 | 2019-01-18 | 合肥工业大学 | A kind of dicyclic six-dimension force sensor |
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