AU2021101889A4 - Splitting test probe for testing tensile strength of coal rocks, and assembly method - Google Patents
Splitting test probe for testing tensile strength of coal rocks, and assembly method Download PDFInfo
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- AU2021101889A4 AU2021101889A4 AU2021101889A AU2021101889A AU2021101889A4 AU 2021101889 A4 AU2021101889 A4 AU 2021101889A4 AU 2021101889 A AU2021101889 A AU 2021101889A AU 2021101889 A AU2021101889 A AU 2021101889A AU 2021101889 A4 AU2021101889 A4 AU 2021101889A4
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- 239000000523 sample Substances 0.000 title claims abstract description 93
- 239000003245 coal Substances 0.000 title claims abstract description 77
- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 239000011435 rock Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims abstract description 10
- 238000002788 crimping Methods 0.000 claims abstract description 6
- 238000003754 machining Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C39/00—Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
OF THE DISCLOSURE
The invention belongs to the technical field of coal production, and discloses a splitting
test probe for testing the tensile strength of coal rocks, and an assembly method. A seamless
tube is disposed inside an air expansion tube, a through hole is formed in a left end of an outer
side of the seamless steel tube, an inner tube of a slide sleeve is integrally formed at a left end
of the seamless tube, the slide sleeve located inside the air expansion tube is disposed around
the inner tube of the slide sleeve, a hydraulic oil pump connector is integrally formed at a
right end of the seamless steel tube, multiple seal ring slots are formed in a left end of an outer
side of the inner tube of the slide sleeve, and seal rings are clamped in the seal ring slots. The
probe is of a piston structure and thus is not limited by the structure and thickness of coal
rocks. The air expansion tube is an expansion body and can withstand a pressure over 5MPA.
A sleeve splitting method is used to systematically test the tensile strength of coal rocks, the
distribution characteristics of tensile strength values of the coal rocks are systematically
analyzed, the differences and reasons for these differences of the tensile strength of the coal
rocks are evaluated, and a scientific basis is provided for tensile strength indicators of coal
rocks applied to underground engineering.
6 2
FIG. 1
Adopt a seamless steel tube, machine a hydraulic oil pump connector, connected to a hydraulic oil pump, at S201
one end of the seamless steel tube, and machine a remaining part of the seamless steel tube until the diameter
of the remaining part is half of the diameter of the seamless steel tube
S202
Cut an inner tube of a slide sleeve at the other end of the seamless steel tube, and cut three slots for mounting
seal rings
S203
Machine the sleeve and keep an inner wall of the sleeve smooth
S204
Mount an air expansion tube, and seal the two ends of the air expansion tube with metal hoops through a
hydraulic crimping machine
Connect the hydraulic oil pump to the hydraulic oilpump connector to inject oil into a probe, squeezing S205
hydraulic oil out via a through hole to allow the air expansion tube to expand outwards to split a coal rock, and
when the outer diameter of the air expansion tube increases along with the expansion of the air expansion tube,
sliding the slide sleeve inwards to dispose it around the innertube of the slide sleeve
FIG. 2
Description
6 2
FIG. 1 Adopt a seamless steel tube, machine a hydraulic oil pump connector, connected to a hydraulic oil pump, at S201
one end of the seamless steel tube, and machine a remaining part of the seamless steel tube until the diameter of the remaining part is half of the diameter of the seamless steel tube
S202 Cut an inner tube of a slide sleeve at the other end of the seamless steel tube, and cut three slots for mounting seal rings
S203 Machine the sleeve and keep an inner wall of the sleeve smooth
S204 Mount an air expansion tube, and seal the two ends of the air expansion tube with metal hoops through a hydraulic crimping machine
Connect the hydraulic oil pump to the hydraulic oilpump connector to inject oil into a probe, squeezing S205 hydraulic oil out via a through hole to allow the air expansion tube to expand outwards to split a coal rock, and when the outer diameter of the air expansion tube increases along with the expansion of the air expansion tube, sliding the slide sleeve inwards to dispose it around the innertube of the slide sleeve
FIG. 2
[0001] 1. Technical Field
[0002] The invention belongs to the technical field of coal production, and particularly
relates to a splitting test probe for testing the tensile strength of coal rocks, and an assembly
method.
[0003] 2. Description of Related Art
[0004] According to the most common technique adopted in the industry at present, it
is very important, during coal production and water control, for safety production of coal
mines and rational exploitation of coal resources to design water-proof coal pillars. The
tensile strength of a coal seam is one of the most important parameters to be calculated when
the water-proof coal pillars are designed, and the value of the tensile strength of the coal seam
has a direct influence on the dimensions of the coal pillars. If the value of the tensile strength
is small, the width of the coal pillars will be large, which may result in resource waste; or, if
the value of the tensile strength is large, potential safety hazards may be caused, which is
unfavorable for exploitation.
[0005] Existing splitting methods for splitting tests on coal rocks have the following
drawbacks: limited by the structure and thickness of coal rocks, one probe can only test the
coal rock with the same thickness; in cases where coal rocks with different thicknesses need
to be tested, probes with the same thicknesses have to be prepared, which greatly increases
test costs; and the existing probes are made of common rubber tubes which have a low
pressure-bearing capacity and a narrow effective expansion range and can only withstand a
maximum pressure of 2MPA, so the existing probes can meet the test requirements of soft coal rocks, but the test range of these probes cannot meet the test requirements of complete coalrocks.
[0006] To sum up, the existing techniques have the following problems: (1) the
existing splitting methods are limited by the structure and thickness of coal rocks when used
to carry out splitting tests on the coal rocks, and different probes have to be prepared for coal
rocks with different thicknesses, so the test costs are greatly increased.
[0007] (2) The existing probes are made of common rubber tubes which have a low
pressure-bearing capacity and a narrow effective expansion range and can only withstand a
maximum pressure of 2MPA, and thus cannot meet test requirements.
[0008] (3) The dimensions of the existing probes are constant, so samples to be tested
by the probes have to be detected according to the fixed length of the probes, and the probes
cannot be flexibly used to test different samples.
[0009] (4) Expansion materials of the existing probes are poor in reliability and short
in service cycle, it is labor-consuming and time-consuming to change expansion tubes, and
frequency replacement of the probes leads to low test efficiency.
[0010] (5) The existing probes are suitable for soft coal samples with low strength,
and are not suitable for complete coal samples with high strength.
[0011] To solve the above technical problems, it is necessary to design a novel probe
which is high in reliability, capable of being used repeatedly, suitable for samples of different
structures and dimensions, high in pressure-bearing capacity, and easy to repair.
[0012] By solving the above technical problems, the novel probe greatly shortens the
test cycle, improves the test efficiency, greatly lowers the requirements for samples and
expands the test range; original probes are only suitable for broken coal with low strength, but
the new probe has a broader test range and can also be used to test complete coal samples
with high strength.
[0013] One objective of the invention is to solve the problems of the prior art by
providing a splitting test probe for testing the tensile strength of coal rocks, and an assembly
method.
[0014] The invention is implemented as follows: a splitting test probe for testing the
tensile strength of coal rocks is provided with:
[0015] An air expansion tube;
[0016] Wherein, a seamless steel tube is disposed inside the air expansion tube, a
through hole is formed in a left end of an outer side of the seamless steel tube, an inner tube
of a slide sleeve is integrally formed at the left end of the seamless steel tube, the slide sleeve
located inside the air expansion tube is disposed around the inner tube of the slide sleeve, and
a hydraulic oil pump connector is integrally formed at a right end of the seamless steel tube.
[0017] Furthermore, multiple seal ring slots are formed in a left end of an outer side of
the inner tube of the slide sleeve, and seal rings are clamped in the seal ring slots.
[0018] Furthermore, metal hoops are fastened around two ends of an outer side of the
air expansion tube.
[0019] Another objective of the invention is to provide an assembly method of the
splitting test probe for testing the tensile strength of coal rocks. The assembly method of the
splitting test probe for testing the tensile strength of coal rocks specifically comprises:
[0020] (1) Adopting the seamless steel tube, machining the hydraulic oil pump
connector, connected to a hydraulic oil pump, at one end of the seamless steel tube, and
machining a remaining part of the seamless steel tube until the diameter of the remaining part
is half of the diameter of the seamless steel tube;
[0021] (2) Cutting the inner tube of the slide sleeve at the other end of the seamless steel tube, and cutting three slots for mounting seal rings;
[0022] (3) Machining the sleeve and keeping an inner wall of the sleeve smooth;
[0023] (4) Mounting the air expansion tube, and sealing the two ends of the air
expansion tube with metal hoops through a hydraulic crimping machine; and
[0024] (5) Connecting the hydraulic oil pump to the hydraulic oil pump connector to
inject oil into the probe, squeezing hydraulic oil out via the through hole to allow the air
expansion tube to expand outwards to split a coal rock, and when the outer diameter of the air
expansion tube increases along with the expansion of the air expansion tube, sliding the slide
sleeve inwards to dispose it around the inner tube of the slide sleeve.
[0025] Furthermore, in Step (1) or Step (2), the seamless steel tube has a length of
150MM and a diameter of 20MM.
[0026] Furthermore, in Step (4), the air expansion tube has a length of 60MM, and an
inner hole of the air expansion tube has a diameter of 6MM.
[0027] Furthermore, in Step (5), the through hole has a diameter of 2mm.
[0028] To sum up, the invention has the following advantages and beneficial effects:
the probe is of a piston structure and thus will not be limited by the thickness and structure of
coal rocks, and the air expansion tube is an expansion body and can withstand a pressure over
MPA, as shown in FIG. 3(a) and FIG. 4.
[0029] Table 1: Test comparison table of a novel probe and an original probe
Dimensions Failure Tensile Test Sampling of Drilling pressure Coal Failure strength time Test site samples/cm direction Po structure features T/MPa /min probe blxbxh /MPa split along the hole, the coal of 32 complete split 22x10x11 1 2.60 massive surface is 2.60 5 novel Qinan coal straight, probe Mine and destroyed along the long axis split along the 72coal of hole, and Yuandian 10x9x8 1 0.80 flaky the split 0.80 20 original No.2 coal surface is probe Mine parallel to the short axis
[0030] Po - failure pressure, L- vertical bedding direction of drilling, b - minimum
distance from the center to the edge of a drilled hole, h - drilling depth, bl - maximum
distance from the center to the edge of a drilled hole, the drilling radius is 10mm.
[0031] The difference of coal structures is the key cause of strength differences, and
the strength of complete coal rocks is higher than that of broken coal rocks. The time
difference is mainly caused by repeated binding of the novel and original probes with ribbons,
which is used to improve the airtightness.
[0032] A sleeve splitting method is used to systematically test the tensile strength of
coal rocks, the distribution characteristics of tensile strength values of coal rocks of different
dimensions and structures are systematically analyzed, the differences and reasons for these
differences of the tensile strength of the coal rocks are evaluated, and a scientific basis is
provided for tensile strength indicators of coal rocks applied to underground engineering.
[0033] FIG. 1 is a structural diagram of a splitting test probe for testing the tensile
strength of coal rocks provided by one embodiment of the invention;
[0034] In this figure: 1, seamless steel tube; 2, hydraulic oil pump connector; 3, air
expansion tube; 4, metal hoop; 5, slide sleeve; 6, inner tube of slide sleeve; 7, seal ring slot; 8,
seal ring; 9, through hole.
[0035] FIG. 2 is a flow diagram of an assembly method of the splitting test probe for
testing the tensile strength of coal rocks provided by one embodiment of the invention.
[0036] FIG. 3 shows pictures of an improved telescopic probe provided by one
embodiment of the invention and an original probe in the prior art;
[0037] In this figure: (a) improved telescopic probe provided by the invention; (b)
original probe in the prior art, wherein the original probe is provided with an oil outlet and has
a fixed test length, different probes have to be made according to the thickness of samples; the
ends of the probe are fixed and sealed with ribbons, which is time-consuming and
labor-consuming; and to realize a good sealing effect and prevent oil leakage, multiple
ribbons are needed.
[0038] FIG. 4 illustrates test comparison diagrams of a novel probe and an original
probe provided by one embodiment of the invention; in this figures: (a) complete coal rock
used in the invention; (b) tectonic coal (flaky) used in the prior art: (c) splitting by the novel
probe provided by the invention; (d) plane view of splitting in the prior art; (e) the structure is
complete and the surface is flat after splitting by the probe in the invention; (f) the structure is
broken and is in a powdery shape in the prior art, as shown in the sectional view of splitting.
[0039] FIG. 5 is an overall test diagram of a device provided by one embodiment of
the invention.
[0040] FIG. 6 illustrates process pictures of a sleeve splitting laboratory test in one
embodiment of the invention; in this figure: a, drilling a coal sample; b, ending drilling; c,
inserting a splitting segment into a hole; d, carrying out splitting.
[0041] FIG. 7 illustrates sleeve splitting test results of part of coal samples provided by one embodiment of the invention;
[0042] In this figure: a, 1# sample before test; b, planar view of splitting of 1# sample;
c, sectional view of splitting of 1# sample; d, 2# sample before test; e, planar view of splitting
of 2# sample; f, sectional view of splitting of 2# sample; g, 3# sample before test; h, planar
view of splitting of 3# sample; i, sectional view of splitting of 3# sample.
[0043] To gain a better understanding of the purposes, technical solutions and
advantages of the invention, the invention will be described in further detail below. It should
be understood that the specific embodiments in the following description are merely used to
explain the invention, and are not intended to limit the invention.
[0044] As shown in FIG. 1, a splitting test probe for testing the tensile strength of coal
rocks in one embodiment of the invention comprises a seamless steel tube 1, a hydraulic oil
pump connector 2, an air expansion tube 3, metal hoops 4, a slide sleeve 5, an inner tube of
the slide sleeve 6, seal ring slots 7, seal rings 8, and a through hole 9.
[0045] The seamless steel tube 1 is disposed inside the air expansion tube 3, the
through hole 9 is formed in the left end of the outer side of the seamless steel tube 1, the inner
tube 6 of the slide sleeve is integrally formed at the left end of the seamless steel tube 1, the
slide sleeve 5 located inside the air expansion tube 3 is disposed around the inner tube 6 of the
slide sleeve, and the hydraulic oil pump connector 2 is integrally formed at the right end of
the seamless steel tube 1.
[0046] In this embodiment of the invention, multiple seal ring slots 7 are formed in
the left end of the outer side of the inner tube of the slide sleeve 5, and the seal rings 8 are
clamped in the seal ring slots 7.
[0047] In this embodiment of the invention, the metal hoops 4 are fastened around two ends of the outer side of the air expansion tube 3.
[0048] As shown in FIG. 2, an assembly method of the splitting test probe for testing
the tensile strength of coal rocks specifically comprises:
[0049] S201: the seamless steel tube is adopted, the hydraulic oil pump connector,
connected to a hydraulic oil pump, is machined at one end of the seamless steel tube, and a
remaining part of the seamless steel tube is machined until the diameter of the remaining part
is half of the diameter of the seamless steel tube.
[0050] S202: the inner tube of the slide sleeve is cut at the other end of the seamless
steel tube, and three slots for mounting seal rings are cut.
[0051] S203: the sleeve is machined, and the inner wall of the sleeve is kept smooth.
[0052] S204: the air expansion tube is mounted, and the two ends of the air expansion
tube are sealed with metal hoops through a hydraulic crimping machine.
[0053] S205: the hydraulic oil pump is connected to the hydraulic oil pump connector
to inject oil into the probe, hydraulic oil is squeezed out via the through hole to allow the air
expansion tube to expand outward to split a coal rock, and when the outer diameter of the air
expansion tube increases with the expansion of the air expansion tube, the slide sleeve is slid
inwards to be disposed around the inner tube of the slide sleeve.
[0054] In this embodiment of the invention, the seamless steel tube has a length of
150MM and a diameter of 20MM.
[0055] In this embodiment of the invention, the air expansion tube has a length of
MM, and an inner hole of the air expansion tube has a diameter of 6MM.
[0056] In this embodiment of the invention, the diameter of the through hole is 2mm.
[0057] The invention will be further described below in conjunction with specific
experiments.
[0058] FIG. 3 shows pictures of an improved telescopic probe provided by one embodiment of the invention and an original probe in the prior art.
[0059] In this figure: (a) improved telescopic probe provided by the invention; (b)
original probe in the prior art, wherein the original probe is provided with an oil outlet and has
a fixed test length, different probes have to be made according to the thickness of samples; the
ends of the probe are fixed and sealed with ribbons, which is time-consuming and
labor-consuming; and to realize a good sealing effect and prevent oil leakage, multiple
ribbons are needed.
[0060] FIG. 4 illustrates test comparison diagrams of a novel probe and an original
probe provided by one embodiment of the invention; in this figures: (a) complete coal rock
used in the invention; (b) tectonic coal (flaky) used in the prior art: (c) splitting by the novel
probe provided by the invention; (d) plane view of splitting in the prior art; (e) the structure is
complete and the surface is flat after splitting by the probe in the invention; (f) the structure is
broken and is in a powdery shape in the prior art, as shown in the sectional view of splitting.
[0061] FIG. 5 is an overall test diagram of a device provided by one embodiment of
the invention.
[0062] FIG. 6 illustrates process pictures of a sleeve splitting laboratory test in one
embodiment of the invention. In this figure: a, drilling a coal sample; b, ending drilling; c,
inserting a splitting segment into a hole; d, carrying out splitting.
[0063] FIG. 7 illustrates sleeve splitting test results of part of coal samples provided
by one embodiment of the invention.
[0064] In this figures: a, 1# sample before test; b, planar view of splitting of 1#
sample; c, sectional view of splitting of 1# sample; d, 2# sample before test; e, planar view of
splitting of 2# sample; f, sectional view of splitting of 2# sample; g, 3# sample before test; h,
planar view of splitting of 3# sample; i, sectional view of splitting of 3# sample.
[0065] Table 2: Table of indoor sleeve splitting test results of coal samples
Dimen Serial sions Dril
Sampling numbe of ling P0 Coal T/Mp sahn r of sample dire P coal Split features T sites /MPa structure a sampl s/cm ctio es blxbx n h split along the hole,
25xlOx the split surface is 1 6 1 2.70 massive straight, and 2.70 destroyed along the
72coalof short diagonal Yuandia split along the hole, n No.2 2 30x16x 1 2.80 massive andthesplitsurface 2.80 8 is parallel to the Mine short axis split along the hole, 15x7x1 and the split surface 0 1 1.10 massive is parallel to the 1.10 short axis massive, split along the hole, vertical 23x15x bending the split surface is 1 // 0.2 .j.oin straight, and split 0.2 10 dno preferably along the
ed joint surface
massive, split along the hole, vertical the split surface is 19x13x joint is straight, and split 12 / 0.6 well along the cutting 0.6 10 coal 2 develop surface of the of of develop vertical joint and Yund ed I the bedding plane
Mine split along the hole, massive, the split surface is
3 26x21x /7 0.5 joint is an intersection 0.5 11 develop surface of the joint ed and the bedding plane
massive, split along the hole, massjive is the split surface is 4 2010 1 0.8 jointis parallel to the long 0.8
ed axis, and split along the parting surface split along the hole, 5 14x12x 0.4 and the split surface mocasi' 0.4 5 wrinkledis parallel to the short axis
[0066] Po - failure pressure, _L- vertical bedding direction of drilling, b - minimum
distance from the center to the edge of a drilled hole, h - drilling depth, bl - maximum
distance from the center to the edge of a drilled hole, the drilling radius is 10mm.
[0067] The above embodiments are merely preferred ones of the invention, and are
not intended to limit the invention. Any modifications, equivalent substitutions, and
improvements made based on the spirit and principle of the invention should also fall within
the protection scope of the invention.
[0068] It will be understood that the term "comprise" and any of its derivatives (eg
comprises, comprising) as used in this specification is to be taken to be inclusive of features
to which it refers, and is not meant to exclude the presence of any additional features unless
otherwise stated or implied.
[0069] The reference to any prior art in this specification is not, and should not be
taken as, an acknowledgement or any form of suggestion that such prior art forms part of the
common general knowledge.
Claims (7)
1. A splitting test probe for testing the tensile strength of coal rocks, being provided with:
an air expansion tube;
wherein, a seamless steel tube is disposed inside the air expansion tube, a through hole is
formed in a left end of an outer side of the seamless steel tube, an inner tube of a slide sleeve
is integrally formed at the left end of the seamless steel tube, the slide sleeve located inside
the air expansion tube is disposed around the inner tube of the slide sleeve, and a hydraulic oil
pump connector is integrally formed at a right end of the seamless steel tube.
2. The splitting test probe for testing the tensile strength of coal rocks according to Claim
1, wherein multiple seal ring slots are formed in a left end of an outer side of the inner tube of
the slide sleeve, and seal rings are clamped in the seal ring slots.
3. The splitting test probe for testing the tensile strength of coal rocks according to Claim
1, wherein metal hoops are fastened around two ends of an outer side of the air expansion
tube.
4. An assembly method of the splitting test probe for testing the tensile strength of coal
rocks according to any one of Claims 1-3, comprising:
(1) adopting the seamless steel tube, machining the hydraulic oil pump connector,
connected to a hydraulic oil pump, at one end of the seamless steel tube, and machining a
remaining part of the seamless steel tube until a diameter of the remaining part is half of a
diameter of the seamless steel tube;
(2) cutting the inner tube of the slide sleeve at the other end of the seamless steel tube, and
cutting three slots for mounting seal rings;
(3) machining the sleeve and keeping an inner wall of the sleeve smooth;
(4) mounting the air expansion tube, and sealing the two ends of thesaid air expansion
tube with metal hoops through a hydraulic crimping machine; and
(5) connecting the hydraulic oil pump to the hydraulic oil pump connector to inject oil into
the probe, squeezing hydraulic oil out via the through hole to allow the air expansion tube to
expand outwards to split a coal rock, and when an outer diameter of the air expansion tube
increases along with the expansion of the air expansion tube, sliding the slide sleeve inwards
to dispose it around the inner tube of the slide sleeve.
5. The assembly method of the splitting test probe for testing the tensile strength of coal
rocks according to Claim 4, wherein in Step (1) or Step (2), the seamless steel tube has a
length of 150MM and a diameter of 20MM.
6. The assembly method of the splitting test probe for testing the tensile strength of coal
rocks according to Claim 4, wherein in Step (4), the air expansion tube has a length of 60MM,
and an inner hole of the air expansion tube has a diameter of 6MM.
7. The assembly method of the splitting test probe for testing the tensile strength of coal
rocks according to Claim 4, wherein in Step (5), the through hole has a diameter of 2mm.
2021101889 1/6
FIG. 1 Adopt a seamless steel tube, machine a hydraulic oil pump connector, connected to a hydraulic oil pump, at S201 one end of the seamless steel tube, and machine a remaining part of the seamless steel tube until the diameter of the remaining part is half of the diameter of the seamless steel tube
S202 Cut an inner tube of a slide sleeve at the other end of the seamless steel tube, and cut three slots for mounting seal rings
S203 Machine the sleeve and keep an inner wall of the sleeve smooth
S204 Mount an air expansion tube, and seal the two ends of the air expansion tube with metal hoops through a hydraulic crimping machine
Connect the hydraulic oil pump to the hydraulic oil pump connector to inject oil into a probe, squeezing S205 hydraulic oil out via a through hole to allow the air expansion tube to expand outwards to split a coal rock, and when the outer diameter of the air expansion tube increases along with the expansion of the air expansion tube, sliding the slide sleeve inwards to dispose it around the inner tube of the slide sleeve
FIG. 2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101889A AU2021101889A4 (en) | 2021-04-13 | 2021-04-13 | Splitting test probe for testing tensile strength of coal rocks, and assembly method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101889A AU2021101889A4 (en) | 2021-04-13 | 2021-04-13 | Splitting test probe for testing tensile strength of coal rocks, and assembly method |
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| AU2021101889A4 true AU2021101889A4 (en) | 2021-06-03 |
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| AU2021101889A Ceased AU2021101889A4 (en) | 2021-04-13 | 2021-04-13 | Splitting test probe for testing tensile strength of coal rocks, and assembly method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115979826A (en) * | 2023-01-09 | 2023-04-18 | 泰安奇正电子科技有限公司 | Detection device and method for pressure bearing strength of pressure gauge adapter |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115979826A (en) * | 2023-01-09 | 2023-04-18 | 泰安奇正电子科技有限公司 | Detection device and method for pressure bearing strength of pressure gauge adapter |
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