CN208420498U - A kind of fixed bracket of test specimen - Google Patents
A kind of fixed bracket of test specimen Download PDFInfo
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- CN208420498U CN208420498U CN201820409396.9U CN201820409396U CN208420498U CN 208420498 U CN208420498 U CN 208420498U CN 201820409396 U CN201820409396 U CN 201820409396U CN 208420498 U CN208420498 U CN 208420498U
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- test specimen
- telescopic rod
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Abstract
The utility model provides a kind of fixed bracket of test specimen, tests for metallographic rubbing down, including fixture, column, horizontal extension mechanism and test specimen fixed mechanism；One end of the column is fixedly connected with the fixture；One end of the horizontal extension mechanism is connected with regulating device, and the horizontal extension mechanism is slidably connected on the column by the regulating device；The other end of the horizontal extension mechanism is connect with the test specimen fixed mechanism.The test specimen fixing rack structure is simple, at low cost, it is fixed to metallographic rubbing down test specimen, simultaneously can the position to metallographic rubbing down test specimen in the horizontal direction, in vertical direction and circumferential direction be adjusted, metallographic rubbing down test specimen is set to be placed exactly in the surface of metallographic polishing and burnishing machine mill, the rubbing down precision and quality of metallographic rubbing down test specimen is good；And multiple metallographic rubbing down test specimens can be handled simultaneously, the metallographic rubbing down test specimen without diameter can be also handled, rubbing down is high-efficient.
Description
Technical field
The utility model relates to rubbing down mechanical assist device fields, and in particular to a kind of fixed bracket of test specimen is used for metallographic
Rubbing down test.
Background technique
Currently, metallographic test be widely used in machining, automobile parts, precision instrument, accurate hardware, cutter, mold,
The industries such as optical element and scientific research institutions, universities and colleges, metrological service and enterprise measurement room workshop, while being also applied to aviation boat
Tian Bu military enterprise.In laboratory to common steel (carbon in thermal power generation unit manufacture, capital construction installation and During Process of Long-term Operation
Steel, low-alloy pearlite steel, structural alloy steel, martensite steel, austenitic steel etc.) metal parts carry out microstructure metallographic
It examines.In order to achieve the above object, grinding and polishing test process, laboratory metallographic for metallographic specimen is carried out in metallography laboratory
Sample quantities are more；The test procedure is complicated, including the sample making courses such as corase grinding, fine grinding, rough polishing, finishing polish.
Existing metallographic polishing and burnishing machine mostly uses hand that metallographic test specimen is taken to carry out rubbing down, and this mode is more time-consuming, and meeting
Influence the precision and quality of metallographic rubbing down test specimen rubbing down.Also have and rubbing down is carried out to metallographic test specimen using full-automatic polishing and burnishing machine, still
Structure is complicated for full-automatic polishing and burnishing machine, higher cost.
Utility model content
In order to solve the above problem, the utility model provides a kind of fixed bracket of test specimen, and structure is simple, at low cost, to metallographic
Rubbing down test specimen is fixed, at the same can the position to metallographic rubbing down test specimen in the horizontal direction, in vertical direction and circumferential direction adjust
Section, makes metallographic rubbing down test specimen be placed exactly in the surface of metallographic polishing and burnishing machine mill, the rubbing down precision and quality of metallographic rubbing down test specimen
It is good；And multiple metallographic rubbing down test specimens can be handled simultaneously, the metallographic rubbing down test specimen without diameter can be also handled, rubbing down is high-efficient.
In order to achieve the above object, the utility model is resolved using following technical scheme.
A kind of fixed bracket of test specimen, is tested, including fixture, column, horizontal extension mechanism and test specimen are solid for metallographic rubbing down
Determine mechanism；One end of the column is fixedly connected with the fixture；One end of the horizontal extension mechanism is connected with regulating device, institute
Horizontal extension mechanism is stated to be slidably connected on the column by the regulating device；The other end of the horizontal extension mechanism with
The test specimen fixed mechanism connection.
The fixed bracket of test specimen according to the present utility model, fixture are used to the fixed bracket of metallographic rubbing down test specimen being fixed on test
On platform, test specimen fixed mechanism is for fixing metallographic rubbing down test specimen, and horizontal extension mechanism is for adjusting metallographic rubbing down test specimen in level
The position in direction.Horizontal extension mechanism is slidably connected on column by regulating device, regulating device adjustable horizontal telescopic machine
Structure moves up and down on column along the axis direction of column, can also do circumferential movement around column；And then adjust metallographic rubbing down test specimen
Position on vertical direction and circumferential direction.The test specimen fixing rack structure of the utility model is simple, at low cost, tries metallographic rubbing down
Part is fixed, at the same can the position to metallographic rubbing down test specimen in the horizontal direction, in vertical direction and circumferential direction be adjusted, make gold
Phase rubbing down test specimen is placed exactly in the surface of metallographic polishing and burnishing machine mill, and the rubbing down precision and quality of metallographic rubbing down test specimen is good.
Preferably, the horizontal extension mechanism includes the first telescopic rod and the second telescopic rod；First telescopic rod
One end be fixedly connected with the regulating device, the other end sliding sleeve of first telescopic rod is mounted in second telescopic rod
In, first telescopic rod and second telescopic rod can relative level movements.
The fixed bracket of test specimen according to the present utility model, the first telescopic rod are slidably inserted in the second telescopic rod, and first stretches
Contracting bar can relative level be mobile in the second telescopic rod, and horizontal extension mechanism is by adjusting the first telescopic rod and the second telescopic rod
Relative position adjusts the position of metallographic rubbing down test specimen in the horizontal direction.
Preferably, the regulating device is clip, one end of first telescopic rod is fixed on described by clip
On column.
The fixed bracket of test specimen according to the present utility model, the first telescopic rod are fixed on column by clip, can be by twisting
Bolt the first telescopic rod of adjusting opened on clip moves up and down on column, and the first telescopic rod is also adjusted around column and does circumferential direction
Movement, and then adjust position of the metallographic rubbing down test specimen on vertical direction and circumferential direction.By tightening the bolt on clip for first
Telescopic rod is secured firmly on column.
Preferably, the regulating device is sleeve, one end of first telescopic rod is sleeved on by the sleeve
On the column, it is provided with threaded hole on the side wall of the sleeve, is equipped with bolt in the threaded hole.
The fixed bracket of test specimen according to the present utility model, the first telescopic rod are sleeved on column by sleeve, and sleeve can be
It is slided up and down on column, circumferential movement can also be made around column, and then adjust metallographic rubbing down test specimen on vertical direction and circumferential direction
Position.It is fixed between sleeve and column by the bolt that matches and threaded hole, bolt passes through phase therewith on sleeve
The threaded hole matched is screwed into, and is withstood on the side wall of column, so that sleeve is fixed on column.
Preferably, the first positioning device is provided between first telescopic rod and second telescopic rod, it is described
First positioning device include the first positioning screw hole and the first positioning bolt, first positioning screw hole be it is multiple, be respectively arranged at
On the side wall of second telescopic rod, first positioning screw hole and first positioning bolt match.
Test specimen according to the present utility model fixes bracket, and multiple first positioning spiral shells are provided on the side wall of the second telescopic rod
Hole, when the first telescopic rod is sleeved on some position in the second telescopic rod, the first positioning bolt is by being screwed into the second telescopic rod
Upper the first matched positioning screw hole is simultaneously withstood on the side wall of the first telescopic rod, so that the first telescopic rod is fixed on second
On telescopic rod.Multiple first positioning screw holes can also be set on the corresponding side wall of the second telescopic rod, be arranged on the second telescopic rod
Threaded hole, bolt pass sequentially through the first positioning screw hole of side on the second telescopic rod, the threaded hole on the first telescopic rod and second
First positioning screw hole of the other side on telescopic rod, and fixed by nut, it is stretched so that the first telescopic rod is secured firmly to second
On contracting bar.
Preferably, the test specimen fixed mechanism includes mobile bar, fixed cylinder and test specimen fixed disk；The horizontal extension
The other end of mechanism is fixedly connected with the fixed cylinder, and the mobile bar sliding sleeve is in the fixed cylinder, the mobile bar
The second positioning device is provided between the fixed cylinder；Multiple test specimen fixation holes are circumferentially provided in the test specimen fixed disk,
The threaded hole and phase for fixing test specimen are provided on the side wall of test specimen fixed disk corresponding to each test specimen fixation hole
The bolt matched；The top of the test specimen fixed disk is axially provided with fixed frame along axle center, and the mobile bar is inserted into the fixed frame
In and be bolted.
Test specimen according to the present utility model fixes bracket, and the multiple test specimen fixation holes being circumferentially arranged in test specimen fixed disk can be same
Batch is put into the metallographic rubbing down test specimen of multiple same diameters, same material, by being arranged on bolt and the side wall of test specimen fixed disk
The threaded hole to match metallographic rubbing down test specimen is fixed in test specimen fixed disk, so as to simultaneously to multiple same diameters, phase
It is high-efficient, time saving and energy saving that the metallographic rubbing down test specimen of same material carries out rubbing down, rubbing down.The top of test specimen fixed disk is axially set along axle center
It is equipped with fixed frame, fixed frame is fixedly connected with test specimen fixed disk, can use the examination with different-diameter instead by disassembly fixed frame
The test specimen fixed disk of part fixation hole, so that the metallographic rubbing down test specimen to different-diameter carries out rubbing down.
Preferably, second positioning device includes the second positioning screw hole and the second positioning bolt, described second is fixed
Position screw hole is set on the side wall of the fixed cylinder, and second positioning screw hole and second positioning bolt match.
Test specimen according to the present utility model fixed bracket is provided with the second positioning screw hole on the side wall of fixed cylinder, by the
Mobile bar is adjusted in the position of fixed cylinder vertical direction, to adjust in two positioning bolts and the second matched positioning screw hole
Save the position of metallographic rubbing down test specimen in the vertical direction.
Preferably, the test specimen fixed mechanism includes test specimen fixed cylinder, it is arranged on the side wall of the test specimen fixed cylinder
There is threaded hole, is equipped with bolt in the threaded hole.
The fixed bracket of test specimen according to the present utility model, for storing metallographic rubbing down test specimen, bolt can twist test specimen fixed cylinder
Enter threaded hole matched on fixed cylinder side wall and withstand on the surface of metallographic rubbing down test specimen, so that metallographic rubbing down test specimen be consolidated
It is scheduled in test specimen fixed cylinder.
Preferably, the fixture is U-clamp tool, one end side wall of the U-clamp tool and one end one of the column
It is body formed, it is provided with threaded hole on the side wall of the other end of the U-clamp tool, is equipped with bolt in the threaded hole.
The fixed bracket of test specimen according to the present utility model, U-clamp tool could be sandwiched on the side wall of testing stand, and by matching
Bolt and threaded hole the fixed bracket of test specimen is fixed on testing stand.Can also in the fixed bracket of fixed test specimen in testing stand and
Rubber sheet gasket is set between bolt, prevents the abrasion to desktop, increases the fastness of U-clamp tool.
Detailed description of the invention
The utility model is described in further details in the following with reference to the drawings and specific embodiments.
Fig. 1 is a kind of fixed structural schematic diagram of embodiment of bracket of test specimen of the utility model；
Fig. 2 is that the test specimen in Fig. 1 fixes structural schematic diagram of the bracket for metallographic test when；
Fig. 3 is the structural schematic diagram of the fixed bracket another kind embodiment of test specimen of the utility model.
In the above figure: 1 column；2 first telescopic rods；3 second telescopic rods；4 sleeves；5 clips；6 mobile bars；7 fixed cylinders；
8 test specimen fixed disks；801 test specimen fixation holes；802 fixed frames；9 test specimen fixed cylinders；10 U-clamps tool.
Specific embodiment
With reference to Fig. 1-3, the fixed bracket of a kind of test specimen that the embodiment of content according to the present utility model is proposed, for gold
The test of phase rubbing down, including fixture, column 1, horizontal extension mechanism and test specimen fixed mechanism；One end of the column 1 is fixedly connected
The fixture；One end of the horizontal extension mechanism is connected with regulating device, and the horizontal extension mechanism is filled by the adjusting
It sets and is slidably connected on the column 1；The other end of the horizontal extension mechanism is connect with the test specimen fixed mechanism.
In the embodiment above, Fig. 2 is that the fixed bracket of test specimen of the utility model is fixed on existing metallographic polishing and burnishing machine mill
The structural schematic diagram of top, fixture are used to the fixed bracket of metallographic rubbing down test specimen being fixed on testing stand, and test specimen fixed mechanism is used
In fixed metallographic rubbing down test specimen, horizontal extension mechanism is for adjusting metallographic rubbing down test specimen position in the horizontal direction.Horizontal extension
Mechanism is slidably connected on column 1 by regulating device, and regulating device adjustable horizontal telescoping mechanism is on column 1 along column 1
Axis direction move up and down, circumferential movement can also be done around column 1；And then metallographic rubbing down test specimen is adjusted in vertical direction and circumferential direction
On position.The test specimen fixing rack structure of the utility model is simple, at low cost, fixed to metallographic rubbing down test specimen, simultaneously
Can the position to metallographic rubbing down test specimen in the horizontal direction, in vertical direction and circumferential direction be adjusted, make metallographic rubbing down test specimen just
Positioned at the surface of metallographic polishing and burnishing machine mill, the rubbing down precision and quality of metallographic rubbing down test specimen is good.
With reference to Fig. 1-3, one embodiment according to the present utility model, the horizontal extension mechanism includes the first telescopic rod 2
With the second telescopic rod 3；One end of first telescopic rod 2 is fixedly connected with the regulating device, first telescopic rod 2 it is another
For one end sliding sleeve in second telescopic rod 3, first telescopic rod 2 can relative level shifting with second telescopic rod 3
It is dynamic.
In the embodiment above, the first telescopic rod 2 is slidably inserted in the second telescopic rod 3, and the first telescopic rod 2 can be second
Relative level is mobile in telescopic rod 3, the relative position that horizontal extension mechanism passes through adjusting the first telescopic rod 2 and the second telescopic rod 3
To adjust the position of metallographic rubbing down test specimen in the horizontal direction.
With reference to Fig. 1-2, one embodiment according to the present utility model, the regulating device is clip 5, and described first is flexible
One end of bar 2 is fixed on the column 1 by clip 5.
In the embodiment above, the first telescopic rod 2 is fixed on column 1 by clip 5, can be by unscrewing on clip 5
Bolt adjusts the first telescopic rod 2 and moves up and down on column 1, and the first telescopic rod 2 is also adjusted around column 1 and does circumferential movement,
And then adjust position of the metallographic rubbing down test specimen on vertical direction and circumferential direction.First is stretched by tightening the bolt on clip 5
Bar 2 is secured firmly on column 1.
With reference to Fig. 3, one embodiment according to the present utility model, the regulating device is sleeve 4, first telescopic rod
2 one end is sleeved on the column 1 by the sleeve 4, and threaded hole, the screw thread are provided on the side wall of the sleeve 4
Bolt is equipped in hole.
In the embodiment above, the first telescopic rod 2 is sleeved on column 1 by sleeve 4, and sleeve 4 can be on column 1 up and down
Sliding can also make circumferential movement around column 1, and then adjust position of the metallographic rubbing down test specimen on vertical direction and circumferential direction.Set
It is fixed between cylinder 4 and column 1 by the bolt and threaded hole that match, bolt passes through spiral shell matched on sleeve 4
Pit is screwed into, and is withstood on the side wall of column 1, so that sleeve 4 is fixed on column 1.
One embodiment according to the present utility model is provided between first telescopic rod 2 and second telescopic rod 3
First positioning device, first positioning device include the first positioning screw hole and the first positioning bolt, first positioning screw hole
Be it is multiple, be respectively arranged on the side wall of second telescopic rod 3, first positioning screw hole and the first positioning bolt phase
Matching.
In the embodiment above, multiple first positioning screw holes are provided on the side wall of the second telescopic rod 3, when the first telescopic rod
2 when being sleeved on some position in the second telescopic rod 3, and the first positioning bolt is matched on the second telescopic rod 3 by being screwed into
The first positioning screw hole and withstand on the side wall of the first telescopic rod 2, so that the first telescopic rod 2 is fixed on the second telescopic rod 3.
Multiple first positioning screw holes can also be set on the corresponding side wall of the second telescopic rod 3, threaded hole is set on the second telescopic rod 3,
Bolt passes sequentially through the first positioning screw hole of side on the second telescopic rod 3, threaded hole and the second telescopic rod on the first telescopic rod 2
First positioning screw hole of the other side on 3, and fixed by nut, so that the first telescopic rod 2 is secured firmly to the second telescopic rod 3
On.
With reference to Fig. 1-2, one embodiment according to the present utility model, the test specimen fixed mechanism includes mobile bar 6, fixes
Cylinder 7 and test specimen fixed disk 8；The other end of the horizontal extension mechanism is fixedly connected with the fixed cylinder 7, and the mobile bar 6 is sliding
It is dynamic to be sleeved in the fixed cylinder 7, the second positioning device is provided between the mobile bar 6 and the fixed cylinder 7；The test specimen
Multiple test specimen fixation holes 801, test specimen fixed disk 8 corresponding to each test specimen fixation hole 801 are circumferentially provided in fixed disk 8
Side wall on the bolt that is provided with threaded hole for fixing test specimen and matches；The top of the test specimen fixed disk 8 is along axle center
It axially is provided with fixed frame 802, the mobile bar 6 is inserted into the fixed frame 802 and is bolted.
In the embodiment above, the multiple test specimen fixation holes 801 being circumferentially arranged in test specimen fixed disk 8 can be put into more with batch
The metallographic rubbing down test specimen of a same diameter, same material passes through matching of being arranged on bolt and the side wall of test specimen fixed disk 8
Metallographic rubbing down test specimen is fixed in test specimen fixed disk 8 by threaded hole, so as to the gold simultaneously to multiple same diameters, same material
It is high-efficient, time saving and energy saving that phase rubbing down test specimen carries out rubbing down, rubbing down.The top of test specimen fixed disk 8 is axially provided with fixation along axle center
Frame 802, fixed frame 802 are fixedly connected with test specimen fixed disk 8, can be used instead by disassembly fixed frame 802 with different-diameter
The test specimen fixed disk 8 of test specimen fixation hole 801, so that the metallographic rubbing down test specimen to different-diameter carries out rubbing down.
With reference to Fig. 1-2, one embodiment according to the present utility model, second positioning device includes the second positioning screw hole
With the second positioning bolt, second positioning screw hole is set on the side wall of the fixed cylinder 7, second positioning screw hole and institute
The second positioning bolt is stated to match.
In the embodiment above, be provided with the second positioning screw hole on the side wall of fixed cylinder 7, by the second positioning bolt and with
The second positioning screw hole to match be adjusted mobile bar 6 in the position of 7 vertical direction of fixed cylinder, thus adjust metallographic rubbing down examination
The position of part in the vertical direction.
With reference to Fig. 3, one embodiment according to the present utility model, the test specimen fixed mechanism includes test specimen fixed cylinder 9, institute
It states and is provided with threaded hole on the side wall of test specimen fixed cylinder 9, be equipped with bolt in the threaded hole.
In the embodiment above, for test specimen fixed cylinder 9 for storing metallographic rubbing down test specimen, bolt can be screwed into test specimen fixed cylinder 9
Matched threaded hole and the surface of metallographic rubbing down test specimen is withstood on side wall, so that metallographic rubbing down test specimen is fixed on test specimen
In fixed cylinder 9.
With reference to Fig. 1-3, one embodiment according to the present utility model, the fixture is U-clamp tool 10, the U-clamp tool
One end of 10 one end side wall and the column 1 is integrally formed, and is provided with screw thread on the side wall of the other end of the U-clamp tool 10
Hole is equipped with bolt in the threaded hole.
In the embodiment above, U-clamp tool 10 could be sandwiched on the side wall of testing stand, and bolt and screw thread by matching
The fixed bracket of test specimen is fixed on testing stand by hole.It can also be arranged between testing stand and bolt in the fixed bracket of fixed test specimen
Rubber sheet gasket prevents the abrasion to desktop, increases the fastness of U-clamp tool 10.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modification and variations of the utility model belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (9)
1. a kind of fixed bracket of test specimen, is tested for metallographic rubbing down, which is characterized in that including fixture, column (1), horizontal extension
Mechanism and test specimen fixed mechanism；One end of the column (1) is fixedly connected with the fixture；One end of the horizontal extension mechanism connects
It is connected to regulating device, the horizontal extension mechanism is slidably connected on the column (1) by the regulating device；The level
The other end of telescoping mechanism is connect with the test specimen fixed mechanism.
2. bracket according to claim 1, which is characterized in that the horizontal extension mechanism include the first telescopic rod (2) and
Second telescopic rod (3)；One end of first telescopic rod (2) is fixedly connected with the regulating device, first telescopic rod (2)
Other end sliding sleeve in second telescopic rod (3), first telescopic rod (2) and second telescopic rod (3) can
Relative level is mobile.
3. bracket according to claim 2, which is characterized in that the regulating device is clip (5), first telescopic rod
(2) one end is fixed on the column (1) by clip (5).
4. bracket according to claim 2, which is characterized in that the regulating device is sleeve (4), first telescopic rod
(2) one end is sleeved on the column (1) by the sleeve (4), is provided with threaded hole on the side wall of the sleeve (4),
Bolt is equipped in the threaded hole.
5. bracket according to claim 2, which is characterized in that first telescopic rod (2) and second telescopic rod (3)
Between be provided with the first positioning device, first positioning device includes the first positioning screw hole and the first positioning bolt, described the
One positioning screw hole be it is multiple, be respectively arranged on the side wall of second telescopic rod (3), first positioning screw hole and described the
One positioning bolt matches.
6. bracket according to claim 1, which is characterized in that the test specimen fixed mechanism includes mobile bar (6), fixed cylinder
(7) and test specimen fixed disk (8)；The other end of the horizontal extension mechanism is fixedly connected with the fixed cylinder (7), the mobile bar
(6) sliding sleeve is provided with the second positioning dress in the fixed cylinder (7) between the mobile bar (6) and the fixed cylinder (7)
It sets；Multiple test specimen fixation holes (801), each test specimen fixation hole (801) institute are circumferentially provided on the test specimen fixed disk (8)
The bolt for being provided with the threaded hole for fixing test specimen on the side wall of corresponding test specimen fixed disk (8) and matching；The test specimen
The top of fixed disk (8) is axially provided with fixed frame (802) along axle center, and the mobile bar (6) is inserted into the fixed frame (802)
And it is bolted.
7. bracket according to claim 6, which is characterized in that second positioning device includes the second positioning screw hole and the
Two positioning bolts, second positioning screw hole are set on the side wall of the fixed cylinder (7), second positioning screw hole and described
Second positioning bolt matches.
8. bracket according to claim 1, which is characterized in that the test specimen fixed mechanism includes test specimen fixed cylinder (9), institute
It states and is provided with threaded hole on the side wall of test specimen fixed cylinder (9), be equipped with bolt in the threaded hole.
9. bracket according to claim 1, which is characterized in that the fixture is that U-clamp has (10), the U-clamp tool
(10) one end of one end side wall and the column (1) is integrally formed, and is arranged on the side wall of the other end of the U-clamp tool (10)
There is threaded hole, is equipped with bolt in the threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820409396.9U CN208420498U (en) | 2018-03-26 | 2018-03-26 | A kind of fixed bracket of test specimen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820409396.9U CN208420498U (en) | 2018-03-26 | 2018-03-26 | A kind of fixed bracket of test specimen |
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| Publication Number | Publication Date |
|---|---|
| CN208420498U true CN208420498U (en) | 2019-01-22 |
Family
ID=65118235
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820409396.9U Active CN208420498U (en) | 2018-03-26 | 2018-03-26 | A kind of fixed bracket of test specimen |
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| Country | Link |
|---|---|
| CN (1) | CN208420498U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112428136A (en) * | 2020-10-26 | 2021-03-02 | 扬州大学 | Concrete test piece grinding and polishing machine |
-
2018
- 2018-03-26 CN CN201820409396.9U patent/CN208420498U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112428136A (en) * | 2020-10-26 | 2021-03-02 | 扬州大学 | Concrete test piece grinding and polishing machine |
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