CN110508998A - One kind just dismantling pin shaft - Google Patents
One kind just dismantling pin shaft Download PDFInfo
- Publication number
- CN110508998A CN110508998A CN201910809581.6A CN201910809581A CN110508998A CN 110508998 A CN110508998 A CN 110508998A CN 201910809581 A CN201910809581 A CN 201910809581A CN 110508998 A CN110508998 A CN 110508998A
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- Prior art keywords
- pin shaft
- hole
- radial
- axially extending
- main body
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
Abstract
The invention discloses one kind just to dismantle pin shaft, comprising: cylindric pin shaft main body, positioned at the axially extending bore of pin shaft body interior, radial through-hole group and end vias, and positioned at the axial notch group of pin shaft main body cylinder；Radial through-hole group includes more than two radial through-hole, and axial notch group includes more than two axial notches, and one end of radial through-hole is connected to axially extending bore, and the other end is connected to axial notch；Axially extending bore is for placing heating device or circulation coolant liquid；Radial through-hole group and axial notch group are for the coolant liquid that circulates；End vias is connected to axially extending bore end, and is removably connected with the blocking mechanism for stopping coolant liquid.Structural member can be prevented to be damaged in disassembly process using aforementioned just disassembly pin shaft, and greatly reduce the workload that staff dismantles corrosion pin shaft.
Description
Technical field
The present invention relates to tower type crane structure part connection areas, more particularly to one kind just to dismantle pin shaft.
Background technique
It during dismantling tower type crane structure part, needs to dismantle pin shaft, be tapped usually using iron hammer
Pin shaft is slowly drawn off.The process expends a large amount of manpowers, brings very big inconvenience to dismantlement work.
Further, since the working environment of derrick crane is severe, corrosion is often being generated after by rain erosion, so that pin shaft
It is cohered mutually on structural member for being inserted into the pin shaft hole of pin shaft.In this case, staff mostly uses jack, forces
The pin shaft of corrosion is extracted into pin shaft hole.When pin shaft and pin shaft hole cohere situation it is serious when, jack can not extract pin shaft, be
At disassembly task, bore hole is often used, serious pin shaft will be cohered and bored, structural member itself has been not only broken up in this way, also increased
The workload of disassembly.
Summary of the invention
From the above technical scheme, the embodiment of the present invention provides one kind and just dismantles pin shaft.It include: cylindric pin shaft master
Body positioned at the axially extending bore of the pin shaft body interior, radial through-hole group and end vias, and is located at the pin shaft main column
The axial notch group in face；
The radial through-hole group includes more than two radial through-hole, and the axial notch group includes more than two axial directions
One end of groove, the radial through-hole is connected to axially extending bore, and the other end is connected to axial notch；
The axially extending bore is for placing heating device or circulation coolant liquid；
The radial through-hole group and axial notch group are for the coolant liquid that circulates；
The end vias is connected to axially extending bore end, and the end vias is removably connected with blocking mechanism；
The blocking mechanism is for stopping coolant liquid.
In one implementation, the blocking mechanism includes sequentially connected oil resistance pin, spring and through-hole lid；
Oil resistance pin both ends be it is coniform, middle section be it is cylindric；
The through-hole lid be it is cylindric, the through-hole is covered with external screw thread, and the end vias is equipped with and external screw thread matches
The internal screw thread of conjunction.
In one implementation, the diameter of the oil resistance pin is greater than the aperture of the axially extending bore, and is less than the end
Hold the aperture of through-hole.
In one implementation, the central axis of the through-hole lid is equipped with hexagon through-hole.
In one implementation, the axially extending bore is set to the central axis of pin shaft main body, described axially extending bore one end
Pin shaft main body head end is extended to, the other end is connected to the end vias.
In one implementation, the radial through-hole group includes two groups, is respectively arranged on apart from pin shaft main body both ends
1/3 at.
In one implementation, every group of radial through-hole group includes four radial through-hole, between each radial through-hole
Angle be 90 °.
In one implementation, described axial notch one end is connected to the radial through-hole, and the other end extends to pin shaft
Body ends.
When existing pin shaft corrodes serious, needs to bore the pin shaft of corrosion using bore hole, structural member is caused to be destroyed, and
The heavy workload of disassembly process.And pin shaft is just dismantled using aforementioned, axially extending bore heating pin shaft is placed in using electric calorifie installation, is made
Pin shaft expanded by heating squeezes the pin shaft hole on the iron filings and structural member of corrosion.After pin shaft sufficiently heats, electric calorifie installation is pulled out
Out, coolant liquid is passed through in through-hole in the axial direction.Coolant liquid is influenced by the blocking of axially extending bore end, most of from pin shaft surface
Outflow is reduced so that pin shaft surface is cooling rapidly.At this point, the pin shaft hole on pin shaft and structural member is convenient for there are certain gap
It is dismantled.Accordingly, with respect to the prior art, aforementioned just disassembly pin shaft can prevent structural member from being damaged in disassembly process
It is bad, and greatly reduce the workload that staff dismantles corrosion pin shaft.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for column crane mast section that part of the embodiment of the present invention provides；
Fig. 2 is a kind of structural schematic diagram for just dismantling pin shaft that part of the embodiment of the present invention provides；
Fig. 3 is a kind of schematic perspective view for just dismantling pin shaft that part of the embodiment of the present invention provides；
Fig. 4 is a kind of structural schematic diagram for just dismantling blocking mechanism in pin shaft that part of the embodiment of the present invention provides；
Fig. 5 is a kind of schematic perspective view for just dismantling blocking mechanism in pin shaft that part of the embodiment of the present invention provides；
Wherein, 1- square tube, 2- pin shaft hole, 3- tenon, 10- pin shaft main body, 20- axially extending bore, 30- radial through-hole group,
301- radial through-hole, 40- end vias, 50- axial notch group, 501- axial notch, 60- blocking mechanism, 601- oil resistance pin,
602- spring, 603- through-hole lid, 6031- hexagon through-hole.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
The embodiment of the present invention discloses one kind and just dismantles pin shaft, is applied on tower type crane structure part, that is, is applied to tower
On the standard knot of crane tower body.Specifically, being a kind of derrick crane mark that part of the embodiment of the present invention provides referring to Fig.1
The structural schematic diagram of quasi- section.As shown in Figure 1, each standard knot is longitudinally equipped with the square tube 1 of four openings, the end of every square tube 1
It is equipped with pin shaft hole 2.When needing to install standard knot, one end of each tenon 3 is fixed with the first standard knot, the other end and
Two standard knots are fixed, specifically, by the way that the half of each tenon 3 to be respectively placed in each square tube of the first standard knot, so that
Tenon and the connection of the first standard knot pound pin shaft into making after being directed at the two due to being again provided with pin shaft hole 2 on the tenon
Pin shaft hole 2 of the pin shaft in square tube 1 and tenon 3 is obtained, thus fixed tenon 3 and the first standard knot, likewise, again by tenon 3
The other half connect with the second standard knot, and by the fixed tenon 3 of pin shaft and the second standard knot, be finally completed two standard knots
Combination.Just disassembly pin shaft of the present invention is applied to the scene, i.e. connection between the standard knot of stacker crane body.
It is a kind of structural schematic diagram for just dismantling pin shaft that part of the embodiment of the present invention provides referring to Fig. 2.Referring to Fig. 3, it is
A kind of schematic perspective view for just dismantling pin shaft that part of the embodiment of the present invention provides.As shown in Figures 2 and 3, a kind of just to tear open
Unload pin shaft, comprising: cylindric pin shaft main body 10, axially extending bore 20, radial through-hole group 30 inside the pin shaft main body 10
With end vias 40, and the axial notch group 50 positioned at 10 cylinder of pin shaft main body；
The radial through-hole group 30 includes more than two radial through-hole 301,
The axial notch group 50 includes more than two axial notches 501, one end of the radial through-hole 301 and axial direction
Through-hole 20 is connected to, and the other end is connected to axial notch 501；
The axially extending bore 20 is for placing heating device or circulation coolant liquid；
The radial through-hole group 30 and axial notch group 50 are for the coolant liquid that circulates；
In the present embodiment, the heating device can be cylindric electrothermal tube, and the diameter of the electrothermal tube is slightly smaller than axial
The diameter of through-hole 20.The coolant liquid can be emulsion, and the emulsion is made of emulsifier and mineral oil, is diluted with water
After emulsion, emulsion that is cheap and possessing good thermal diffusivity is formed, specifically, the emulsion is a kind of oil liquid.
The end vias 40 is connected to 20 end of axially extending bore, and the end vias 40 is removably connected with blocking mechanism
60；
The blocking mechanism 60 is for stopping coolant liquid.
In the present embodiment, pin shaft is just dismantled by aforementioned, when needing to dismantle pin shaft, pin shaft and knot can be passed through
Pin shaft hole on component expands with heat and contract with cold, so that forming gap between pin shaft and the pin shaft hole mutually cohered.Specifically, firstly, will
Electric calorifie installation is placed in axially extending bore heating pin shaft, makes pin shaft expanded by heating, squeezes the pin on the iron filings and structural member of corrosion
Axis hole.In the present embodiment, the electric calorifie installation can be electrothermal tube.Then, after pin shaft sufficiently heats, electric calorifie installation is pulled out
Out, coolant liquid is passed through in through-hole in the axial direction.Coolant liquid is influenced by the blocking of axially extending bore end, most of from pin shaft surface
Outflow is reduced so that pin shaft surface is cooling rapidly.At this point, the pin shaft hole on pin shaft and structural member is convenient for there are certain gap
It is dismantled.Accordingly, with respect to the prior art, just disassembly pin shaft can greatly reduce work to one kind disclosed by the embodiments of the present invention
Make personnel and dismantle the workload of corrosion pin shaft, and structural member is effectively prevent to be damaged.
Specifically, just disassembly pin shaft of the present invention can be following size: the diameter of the pin shaft main body 10 is 20cm, long
For 50cm, the diameter of axially extending bore 20 is 3cm, and radial through-hole 301 is long 5cm, wide 1cm, and the cross section of radial through-hole 301 is
Round rectangle, the diameter of end vias 40 are 5cm, axial notch 501 depth 1cm, groove width 1cm.It is of the present invention just to dismantle pin shaft
The material used is Q235 common iron, passes through approximate calculation, this hair of the diameter of 20cm without the pin shaft of fluting Yu 23cm diameter
Bright just disassembly pin shaft intensity in terms of shear extrusion is consistent.
In addition, through-hole is rusted generation iron rust in the present embodiment, the softer emulsion that can be passed through of iron rust is cleaned, only
It is required that oil circuit is unimpeded, it is not necessary to guaranty that and corrodes not at all.
It is a kind of structural schematic diagram for just dismantling blocking mechanism in pin shaft that part of the embodiment of the present invention provides referring to Fig. 4.
It is a kind of schematic perspective view for just dismantling blocking mechanism in pin shaft that part of the embodiment of the present invention provides referring to Fig. 5.Such as figure
Shown in 4 and Fig. 5, the blocking mechanism 60 includes sequentially connected oil resistance pin 601, spring 602 and through-hole lid 603；
601 both ends of oil resistance pin be it is coniform, middle section be it is cylindric；
The through-hole lid 603 be it is cylindric, the through-hole lid 603 be equipped with external screw thread, the end vias 40 be equipped with it is outer
The internal screw thread that screw thread matches.
The diameter of the oil resistance pin 601 is greater than the aperture of the axially extending bore 20, and is less than the hole of the end vias 40
Diameter.
In the present embodiment, since the aperture of end vias 40 is greater than the aperture of axially extending bore 20, oil resistance pin 601 can be put
When being placed in end vias 40, it will not move in axially extending bore 20.
In addition, oil resistance pin 601, spring 602 are successively placed in end vias 40 after to just disassembly pin shaft heats
In, it is threadedly coupled by through-hole lid with end vias, oil resistance pin 601 can be fitted closely with the end of axially extending bore 20.To axis
After being passed through coolant liquid to through-hole 20, blocking mechanism 60 can stop most of coolant liquid to be circulated to axially extending bore 20, and make cold
But liquid is successively circulated to axially extending bore 20, radial through-hole group 30 and axial notch group 50 so that pin shaft main body 10 obtain quickly and
It is adequately cooling.
As shown in figure 3,603 central axis of through-hole lid is equipped with hexagon through-hole 6031.
In the present embodiment, since 603 central axis of through-hole lid is equipped with hexagon through-hole, when the pressure of coolant liquid is excessive,
Through-hole is formed between the hexagon through-hole 6031 and axially extending bore 20 of through-hole lid central axis, coolant liquid passes through hexagon through-hole
6031 outflow pin shaft main bodys 10.Coolant liquid can be excluded in time in pin shaft main body 10 when the pressure for being cooled liquid is excessive.
In addition, through-hole lid 603 is screwed in end vias 40 after oil resistance pin 601, spring 602 are packed into end vias 40
When, the tool with hexagon that can be used is inserted into the hexagon through-hole 6031, easily by 603 precession end vias of through-hole lid
40。
The axially extending bore 20 is set to the central axis of pin shaft main body 10, and described 20 one end of axially extending bore extends to pin shaft master
10 head end of body, the other end are connected to the end vias 40.
10 head end of pin shaft main body of the present invention, i.e. 10 cylindrical outer side of pin shaft main body are equipped with the one end at protrusion edge, described
10 end of pin shaft main body, i.e. 10 cylindrical outer side of pin shaft main body are not provided with the one end at protrusion edge.
In the present embodiment, need to distinguish head end and the end of pin shaft main body 10, because end vias 40 can only be in pin shaft master
The end of body 10 opens up, and axial notch group 50 is provided with the surface of pin shaft, and guides coolant liquid to the end of pin shaft main body 10
Flowing, so needing to distinguish head end and the end of pin shaft main body 10.
The radial through-hole group 30 includes two groups, is respectively arranged at the 1/3 of 10 both ends of pin shaft main body.
In the present embodiment, by the way that radial through-hole group 30 to be uniformly distributed in pin shaft main body 10, it can protect to the full extent
The strength and stiffness for guaranteeing pin shaft while demonstrate,proving cooling velocity, can further be promoted after being passed through coolant liquid, to pin shaft main body 10
Cooling efficiency.
Every group of radial through-hole group 30 includes four radial through-hole 301, and the angle between each radial through-hole 301 is
90°.In the present embodiment, by the way that radial through-hole 301 to be uniformly distributed in the circumference in 20 outside of axially extending bore, it is being passed through coolant liquid
When, it can be as quickly cooling by pin shaft main body 10 as possible, certain radial through-hole 301 is The more the better, but in view of just dismantling pin shaft
Strength and stiffness, optimal selection is exactly two groups of radial through-hole groups 30 to be arranged, and four diameters are arranged in every group of radial through-hole group 30
To through-hole 301.Radial through-hole group 30 is set in this way, while promoting the cooling efficiency to pin shaft main body 10, is protected as far as possible
The card strength and stiffness for just dismantling pin shaft.
As shown in Figures 2 and 3, described 501 one end of axial notch is connected to the radial through-hole 301, and the other end extends to
10 end of pin shaft main body.
In the present embodiment, coolant liquid passes through axially extending bore 20, radial through-hole group 30 and the axial notch group 50 being sequentially communicated,
From 10 internal circulation of pin shaft main body to the surface of pin shaft main body 10, pin shaft main body 10 is adequately cooled down by quickly, so that pin
Gap is formed between shaft body 10 and the pin shaft hole mutually cohered.
In addition, just dismantling pin shaft for above-mentioned, a kind of method for dismantling pin shaft is also disclosed in part of the embodiment of the present invention.It is described
Method includes:
Step 1, heating device is placed in axially extending bore 20.
Step 2, after pin shaft heating is abundant, heating device is taken out from axially extending bore 20.
In this step, heating temperature is to be heated to 100 DEG C or so, and heating time depends on the power of electrothermal tube, protects here
Card is heated to 100 DEG C or so.In addition, selection is heated to 100 DEG C or so, allowing for the coolant liquid that the present invention uses is cream
Change liquid, and emulsion contains water, temperature is excessively high to generate violent gasification, influence cooling down operation.
Through the above steps, enable to 10 expanded by heating of pin shaft main body, squeeze corrosion iron filings and with pin shaft main body
10 pin shaft holes mutually cohered.
Step 3, blocking mechanism 60 is connected to the end vias 40, the axially extending bore 20 of Xiang Suoshu pin shaft head end is passed through
Coolant liquid.
In this step, cooling temperature is is cooled to room temperature, specifically, room temperature herein can be 25 DEG C or so, it is cold
But the time depends on the quality of emulsion, guarantees to be cooled to room temperature.When summer temp is higher, it can properly increase and add
Hot temperature is cooled back to room temperature, guarantees after heating and temperature difference after cooling can have 100 DEG C, when winter temperature is lower, make phase
It should adjust.
Step 4, it is tapped using iron hammer or jack extracts pin shaft main body 10.
Through the above steps, coolant liquid passes through axially extending bore 20, radial through-hole group 30 and the axial notch group being sequentially communicated
50, from 10 internal circulation of pin shaft main body to the surface of pin shaft main body 10, pin shaft main body 10 is adequately cooled down by quickly, so that
Gap is formed between pin shaft main body 10 and the pin shaft hole mutually cohered with pin shaft main body 10, specifically, gap herein reaches
1mm or so, taps eventually by iron hammer or jack extracts pin shaft main body 10.In addition, working as the pressure mistake of coolant liquid
When big, through-hole is formed between the hexagon through-hole 6031 and axially extending bore 20 of through-hole lid central axis, coolant liquid passes through hexagon
Through-hole 6031 flows out pin shaft main body 10.
Accordingly, with respect to the prior art, just disassembly pin shaft can greatly reduce work to one kind disclosed by the embodiments of the present invention
Make personnel and dismantle the workload of corrosion pin shaft, and structural member is effectively prevent to be damaged in disassembly process.
The present invention provides one kind just to dismantle pin shaft, and the above is only basic principle and embodiment of the invention, is answered
When pointing out, for the technical staff in industry field, without departing from the principle of the present invention, can also make several
Improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (8)
1. one kind just dismantles pin shaft characterized by comprising cylindric pin shaft main body (10) is located at the pin shaft main body (10)
Internal axially extending bore (20), radial through-hole group (30) and end vias (40), and it is located at pin shaft main body (10) cylinder
Axial notch group (50)；
The radial through-hole group (30) includes more than two radial through-hole (301), and the axial notch group (50) includes two
One end of above axial notch (501), the radial through-hole (301) is connected to axially extending bore (20), and the other end and axial direction are recessed
Slot (501) connection；
The axially extending bore (20) is for placing heating device or circulation coolant liquid；
The radial through-hole group (30) and axial notch group (50) are for the coolant liquid that circulates；
The end vias (40) is connected to axially extending bore (20) end, and the end vias (40) is removably connected with blocking machine
Structure (60)；
The blocking mechanism (60) is for stopping coolant liquid.
2. according to claim 1 just dismantle pin shaft, which is characterized in that the blocking mechanism (60) includes sequentially connected
Oil resistance pin (601), spring (602) and through-hole lid (603)；
Oil resistance pin (601) both ends be it is coniform, middle section be it is cylindric；
The through-hole lid (603) be it is cylindric, the through-hole lid (603) be equipped with external screw thread, the end vias (40) be equipped with
The internal screw thread that external screw thread matches.
3. according to claim 1 or 2 just dismantle pin shaft, which is characterized in that the diameter of the oil resistance pin (601) is greater than institute
The aperture of axially extending bore (20) is stated, and is less than the aperture of the end vias (40).
4. according to claim 2 just dismantle pin shaft, which is characterized in that through-hole lid (603) central axis is equipped with six
Side shape through-hole (6031).
5. according to claim 1 just dismantle pin shaft, which is characterized in that the axially extending bore (20) is set to pin shaft main body
(10) central axis, described axially extending bore (20) one end extend to pin shaft main body (10) head end, and the other end is connected to the end
It holds through-hole (40).
6. according to claim 1 just dismantle pin shaft, which is characterized in that the radial through-hole group (30) includes two groups, point
It She Yu not be at the 1/3 of pin shaft main body (10) both ends.
7. just disassembly pin shaft according to claim 1 or 6, which is characterized in that every group of radial through-hole group (30) includes four
Radial through-hole (301), the angle between each radial through-hole (301) is 90 °.
8. according to claim 1 just dismantle pin shaft, which is characterized in that described axial notch (501) one end and the diameter
It is connected to through-hole (301), the other end extends to pin shaft main body (10) end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019106450620 | 2019-07-17 | ||
| CN201910645062 | 2019-07-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110508998A true CN110508998A (en) | 2019-11-29 |
| CN110508998B CN110508998B (en) | 2021-01-26 |
Family
ID=68629094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910809581.6A Active CN110508998B (en) | 2019-07-17 | 2019-08-29 | Just, dismantle round pin axle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110508998B (en) |
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| GB610039A (en) * | 1944-01-25 | 1948-10-11 | Sydney Harman Phillips | Rivet and riveting method |
| CN2806856Y (en) * | 2005-05-25 | 2006-08-16 | 张永杰 | Readily dismantled high-pressure stud and bolt |
| CN202238988U (en) * | 2011-08-31 | 2012-05-30 | 太原重工股份有限公司 | Device for dismounting inner lining of extrusion container |
| CN204344621U (en) * | 2014-12-23 | 2015-05-20 | 温州市胜隆标准件制造有限公司 | Cooling type tapping screw |
| CN204704236U (en) * | 2015-06-08 | 2015-10-14 | 张鹤榕 | A kind of crowded expanding fastening kit |
| CN108119451A (en) * | 2016-11-30 | 2018-06-05 | 王冠 | A kind of expansion type pin |
| CN208185180U (en) * | 2018-05-18 | 2018-12-04 | 温州市力航汽车部件有限公司 | It is a kind of for positioning the tapping screw of supporting device |
-
2019
- 2019-08-29 CN CN201910809581.6A patent/CN110508998B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB610039A (en) * | 1944-01-25 | 1948-10-11 | Sydney Harman Phillips | Rivet and riveting method |
| CN2806856Y (en) * | 2005-05-25 | 2006-08-16 | 张永杰 | Readily dismantled high-pressure stud and bolt |
| CN202238988U (en) * | 2011-08-31 | 2012-05-30 | 太原重工股份有限公司 | Device for dismounting inner lining of extrusion container |
| CN204344621U (en) * | 2014-12-23 | 2015-05-20 | 温州市胜隆标准件制造有限公司 | Cooling type tapping screw |
| CN204704236U (en) * | 2015-06-08 | 2015-10-14 | 张鹤榕 | A kind of crowded expanding fastening kit |
| CN108119451A (en) * | 2016-11-30 | 2018-06-05 | 王冠 | A kind of expansion type pin |
| CN208185180U (en) * | 2018-05-18 | 2018-12-04 | 温州市力航汽车部件有限公司 | It is a kind of for positioning the tapping screw of supporting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110508998B (en) | 2021-01-26 |
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