CN111486163A - Expansion type pin shaft for mounting standard section of tower crane and use method - Google Patents
Expansion type pin shaft for mounting standard section of tower crane and use method Download PDFInfo
- Publication number
- CN111486163A CN111486163A CN202010269607.5A CN202010269607A CN111486163A CN 111486163 A CN111486163 A CN 111486163A CN 202010269607 A CN202010269607 A CN 202010269607A CN 111486163 A CN111486163 A CN 111486163A
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- Prior art keywords
- pin shaft
- expansion
- tower crane
- outer sleeve
- mounting
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009434 installation Methods 0.000 claims abstract description 8
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 5
- 238000009435 building construction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/066—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses an expansion type pin shaft for mounting a tower crane standard section and a use method thereof, wherein the expansion type pin shaft comprises an expansion pin shaft and a pin shaft wrench; the expansion pin shaft is arranged at the joint of the standard section of the tower crane and comprises an expansion inner column, an end cover, an outer sleeve, a locking elastic sheet and a safety pin, the end cover is arranged at the head end of the outer sleeve, the expansion inner column comprises a connecting part at the outer end and an expansion part at the inner end, the expansion part is positioned in the cavity of the outer sleeve, the connecting part passes through the end cover and is positioned outside the outer sleeve, a locking nut is sleeved on the connecting part, the locking elastic sheet is arranged on the outer wall of the outer sleeve; the outer wall of the expansion part is provided with a step-shaped bulge, and the inner wall of the locking elastic sheet is provided with a matched step-shaped bulge; the pin shaft wrench is attached to the end cover and connected with the connecting part. According to the invention, the tower crane standard section is fixed by the expansion type pin shaft, the tower crane standard section is easy to insert into the mounting hole during installation, the operation is convenient, and the pin shaft is expanded to clamp the mounting hole after installation, so that the construction safety and the whole state stability of the tower crane are effectively ensured.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to an expansion type pin shaft for mounting a tower crane standard section and a using method thereof.
Background
The tower crane is an indispensable large-scale construction machine in the building construction process, and major accidents easily occur in the jacking process of the tower crane. The key step of the tower crane jacking operation is to completely separate a standard knot of the tower crane from a slewing device of the tower crane, install a new standard knot on the lower part of the slewing device of the tower crane and fixedly connect the new standard knot with a pin shaft. The pin shaft used at the position is in interference fit generally, when the installation is carried out, a worker needs to knock the pin shaft into the installation hole by a sledge hammer, but the operation mode has great potential safety hazard, and the accidents during the lifting of the suspended ceiling of the tower occur mostly at the moment, so that the influence on the safety construction is great. The invention provides an expansion type pin shaft for installing a standard section of a tower crane and a using method thereof, which are used for overcoming the defects.
Disclosure of Invention
The invention provides an expansion type pin shaft for installing a tower crane standard knot and a using method thereof, which replace the original common pin shaft, realize automatic installation of the tower crane pin shaft, are convenient and safe, and avoid the danger of high-altitude operation.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an expansion type pin shaft for mounting a tower crane standard section comprises an expansion pin shaft and a pin shaft wrench; the expansion pin shaft is arranged at the joint of the standard section of the tower crane and comprises an expansion inner column, an end cover, an outer sleeve, a locking elastic sheet and a safety pin, the end cover is arranged at the head end of the outer sleeve, the expansion inner column comprises a connecting part at the outer end and an expansion part at the inner end, the expansion part is positioned in the cavity of the outer sleeve, the connecting part penetrates through the end cover and is positioned outside the outer sleeve, a locking nut is arranged on the connecting part, the locking elastic sheets are arranged on the outer wall of the outer sleeve at intervals, and the safety pin is arranged; the outer wall of the expansion part is provided with a stepped bulge, and the inner wall of the locking elastic sheet is provided with a matched stepped bulge;
the pin shaft wrench is attached to the end cover and connected with the connecting part.
Furthermore, the locking nut is positioned on the outer side of the end cover and sleeved on the expansion inner column; the pin shaft wrench is provided with a nut groove and a rotating groove from outside to inside in sequence, the connecting portion is matched with the rotating groove, and the locking nut is matched with the nut groove.
Further, the nut recess is fixed, and the working process keeps fixed, rotatory recess is the rotary type, along axial rotation in the working process.
Furthermore, a slot is formed in the outer wall of the outer sleeve, the locking elastic pieces are arranged in the slot, and the locking elastic pieces are uniformly arranged at intervals along the radial direction of the outer sleeve.
Furthermore, a step is arranged at the inner end of the locking elastic sheet, a corresponding step is arranged on the outer sleeve groove, and the inner end of the locking elastic sheet is fixed with the outer sleeve wall through extrusion of the outer wall of the expansion inner column.
Further, the safety pin is perpendicular to the axial direction of the outer sleeve, and the size of two ends of the safety pin is larger than the outer diameter of the expanded outer sleeve.
Further, the end cover is fixedly connected with the outer sleeve through a fixing screw, and the outer diameter of the end cover is larger than the outer diameter of the expanded outer sleeve.
Further, the nut groove is a hexagonal groove, and the rotary groove is a square groove.
Furthermore, an electromagnet is arranged in the pin shaft wrench.
A use method of an expansion type pin shaft for installing a standard section of a tower crane comprises the following steps:
s1, assembling the pin shaft: firstly, installing a locking elastic sheet in a slot of an outer sleeve, then inserting an expansion inner column to clamp the locking elastic sheet, and then sequentially installing an end cover and a locking nut;
s2, standard section butt joint: separating the standard knot of the tower crane from the slewing device of the tower crane, and installing a new standard knot on the lower part of the slewing device of the tower crane;
s3, inserting a pin: inserting the assembled pin shaft into the mounting hole of the standard knot, and then mounting the safety pin on the pin shaft;
s4, expanding and locking: and (3) clamping the expansion inner column and the locking nut by using the pin shaft wrench, so that the expansion inner column moves outwards, the locking elastic sheet is forced to expand in place to clamp the mounting hole, and then the pin shaft wrench is taken down to finish mounting.
The invention has the following beneficial effects:
the tower crane standard joint is fixed by the expansion type pin shaft, the tower crane standard joint is easy to insert into the mounting hole during mounting, the operation is convenient, and the pin shaft expands to clamp the mounting hole after mounting, so that the construction safety and the whole state stability of the tower crane are effectively ensured;
the normal state and the expansion state of the pin shaft are changed by changing the relative positions of the steps on the expansion inner column and the locking elastic sheet, and the stability of the expansion state is ensured by matching with the locking nut, so that the tower crane has the advantages of stability, safety and reliability in the state of the tower crane after use; the cooperation round pin axle spanner is suitable for, realizes automatic installation, has simple operation safety, advantage that the efficiency of construction is high.
Drawings
FIG. 1 is a schematic view of the present invention in use;
FIG. 2 is a sectional view showing a connection state of the present invention;
FIG. 3 is a schematic view of the expansion pin structure of the present invention;
FIG. 4 is a schematic view of the structure of the expanded inner column of the present invention;
FIG. 5 is a schematic view of the locking spring of the present invention;
fig. 6 is a schematic view of the overall structure of the pin spanner of the present invention.
Reference numerals: 1-expansion pin shaft, 11-expansion inner column, 111-connecting part, 112-expansion part, 12-end cover, 121-fixing screw, 13-outer sleeve, 14-locking elastic sheet, 15-safety pin, 16-locking nut, 2-pin shaft wrench, 21-nut groove and 22-rotation groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
As shown in fig. 1, 2, 3, 4 and 5, an expansion type pin for mounting a tower crane standard section comprises an expansion pin 1 and a pin wrench 2; the expansion pin shaft 1 is arranged at the joint of a standard section of a tower crane and comprises an expansion inner column 11, an end cover 12, an outer sleeve 13, a locking elastic sheet 14 and a safety pin 15, wherein the end cover 12 is arranged at the head end of the outer sleeve 13, the expansion inner column 11 comprises a connecting part 111 at the outer end and an expansion part 112 at the inner end, the expansion part 112 is positioned in a cavity of the outer sleeve 13, the connecting part 111 penetrates through the end cover 12 and is positioned outside the outer sleeve 13, the connecting part 111 is provided with a locking nut 16, the locking elastic sheet 14 is arranged on the outer wall of the outer sleeve 13 at intervals, and the safety pin 15 is arranged at the; a step-shaped bulge is arranged on the outer wall of the expansion part 112, and a matched step-shaped bulge is arranged on the inner wall of the locking elastic sheet 14; the pin spanner 2 is attached to the end cover 12 and connected to the connecting portion 111.
As shown in fig. 2, the working principle of the present invention is as follows, after the expansion pin 1 is assembled, the step-shaped protrusion on the expansion inner column 11 and the step-shaped protrusion on the inner wall of the locking elastic sheet 14 recede from each other, the expansion pin 1 is in a normal state, when in use, the expansion inner column 11 is rotated by the pin wrench 2 to move outwards, at this time, the step-shaped protrusion on the expansion inner column 11 and the step-shaped protrusion on the inner wall of the locking elastic sheet 14 are dislocated from each other, the outer end of the locking elastic sheet 14 is squeezed to expand, the mounting hole of the tower crane standard joint is clamped, and at this time, the locking nut 16 fixes the position state of the expansion inner column 11, so as to prevent the expansion inner column 11 from receding inwards, and.
As shown in fig. 2 and 6, further, the locking nut 16 is located outside the end cap 12 and is sleeved on the expansion inner column 11; the pin spanner 2 is sequentially provided with a nut groove 21 and a rotating groove 22 from outside to inside, the connecting part 111 is matched with the rotating groove 22, and the locking nut 16 is matched with the nut groove 21. The locking nut 16 is used for fixing the state of the expansion inner column 11, ensuring that the expansion inner column is in a stable state after moving, and avoiding the reset of the expansion pin shaft 1.
As shown in fig. 2 and 6, the nut groove 21 is fixed and remains fixed during operation, and the rotating groove 22 is rotatable and rotates axially during operation. The nut groove 21 is matched with the locking nut 16, so that the stable state of the locking nut 16 is ensured, and further the stable state of the expansion inner column 11 is ensured; the rotary groove 22 drives the expansion inner column 11 to rotate and drive the expansion inner column to move inside and outside, so that the expansion inner column extrudes the locking elastic sheet 14 to expand.
As shown in fig. 2 and 5, further, a slot is formed in the outer wall of the outer sleeve 13, the locking elastic pieces 14 are arranged in the slot, and the locking elastic pieces 14 are uniformly arranged at intervals along the radial direction of the outer sleeve 13.
Preferably, the number of the locking elastic sheets 14 is 3, and the locking elastic sheets are uniformly arranged on the outer sleeve 13 at intervals.
As shown in fig. 2, 4 and 5, further, a stepped step is provided at the inner end of the locking spring 14, a corresponding stepped step is provided on the slot of the outer sleeve 13, and the inner end of the locking spring 14 is fixed by pressing the outer wall of the expansion inner column 11 and the wall of the outer sleeve 13.
As shown in fig. 4, further, the inner end of the expansion portion 112 is a smooth outer wall surface and is attached to the inner wall surface of the stepped step at the inner end of the locking elastic sheet 14, the inner end of the locking elastic sheet 14 is clamped and fixed by the expansion portion 112 and the outer sleeve 13, so as to ensure the position stability, and when the expansion inner column 11 moves outwards, the locking elastic sheet 14 is still squeezed, clamped and fixed, so as to avoid falling off.
Further, the safety pin 15 is arranged perpendicular to the axial direction of the outer sleeve 13, and the size of both ends of the safety pin is larger than the outer diameter of the expanded outer sleeve 13. The safety pin 15 is used for limiting the mounting of the expansion pin shaft 1, so that the non-expanded pin shaft is prevented from falling off.
Further, the end cap 12 is fixedly connected with the outer sleeve 13 through a fixing screw 121, and the outer diameter of the end cap 12 is larger than the expanded outer diameter of the outer sleeve 13.
Through the cooperation of safety pin 15 and end cover 12, guarantee that the round pin axle that does not expand is stable in the mounting hole, avoids droing.
Further, the nut groove 21 is a hexagonal groove, and the rotation groove 22 is a square groove.
Furthermore, an electromagnet is arranged in the pin shaft wrench 2.
Further, the pin spanner 2 is hydraulically driven and is mounted on a mechanical arm. The expansion pin shaft 1 is adsorbed and positioned by installing an electromagnet in a hydraulic wrench, and then the expansion pin shaft is automatically installed by hydraulic driving.
As shown in fig. 1 and 2, a method for using an expansion type pin shaft for installing a standard section of a tower crane comprises the following steps:
s1, assembling the pin shaft: firstly, installing a locking elastic sheet 14 in a groove of an outer sleeve 13, then inserting an expansion inner column 11 to clamp the locking elastic sheet 14, and then sequentially installing an end cover 12 and a locking nut 16;
s2, standard section butt joint: separating the standard knot of the tower crane from the slewing device of the tower crane, and installing a new standard knot on the lower part of the slewing device of the tower crane;
s3, inserting a pin: inserting the assembled pin shaft into the mounting hole of the standard knot, and then mounting the safety pin 15 on the pin shaft;
s4, expanding and locking: and (3) clamping the expansion inner column 11 and the locking nut 16 by using the pin shaft wrench 2, so that the expansion inner column 11 moves outwards, the locking elastic sheet 14 is forced to expand in place to clamp the mounting hole, and then the pin shaft wrench 2 is taken down to finish the mounting.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides an inflation formula round pin axle for installation of tower crane standard festival, characterized by: comprises an expansion pin shaft (1) and a pin shaft wrench (2); the expansion pin shaft (1) is arranged at the joint of the standard section of the tower crane and comprises an expansion inner column (11), an end cover (12), an outer sleeve (13), a locking elastic sheet (14) and a safety pin (15), the end cover (12) is arranged at the head end of the outer sleeve (13), the expansion inner column (11) comprises a connecting part (111) of the outer end and an expansion part (112) of the inner end, the expansion part (112) is located in the cavity of the outer sleeve (13), the connecting part (111) penetrates through the end cover (12) to be located outside the outer sleeve (13), a locking nut (16) is arranged on the connecting part (111), the locking elastic sheet (14) is arranged on the outer wall of the outer sleeve (13) at intervals, and the safety pin (15) is arranged at the tail end of; the outer wall of the expansion part (112) is provided with a step-shaped bulge, and the inner wall of the locking elastic sheet (14) is provided with a matched step-shaped bulge;
the pin shaft wrench (2) is attached to the end cover (12) and is connected with the connecting part (111).
2. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 1, which is characterized in that: the locking nut (16) is positioned on the outer side of the end cover (12) and sleeved on the expansion inner column (11); the pin roll wrench (2) is provided with a nut groove (21) and a rotating groove (22) from outside to inside in sequence, the connecting part (111) is matched with the rotating groove (22), and the locking nut (16) is matched with the nut groove (21).
3. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 2, which is characterized in that: nut recess (21) are fixed, and the course of the work keeps fixed, rotatory recess (22) are the rotary type, and the course of the work is along axial rotation.
4. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 1, which is characterized in that: the outer sleeve (13) is provided with a groove on the outer wall, the locking elastic pieces (14) are arranged in the groove, and the locking elastic pieces (14) are uniformly arranged at intervals along the radial direction of the outer sleeve (13).
5. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 4, which is characterized in that: the inner end of the locking elastic sheet (14) is provided with a step, the groove of the outer sleeve (13) is provided with a corresponding step, and the inner end of the locking elastic sheet (14) is fixed with the wall of the outer sleeve (13) through extrusion of the outer wall of the expansion inner column (11).
6. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 1, which is characterized in that: the safety pin (15) is perpendicular to the axial direction of the outer sleeve (13), and the size of two ends of the safety pin is larger than the outer diameter of the expanded outer sleeve (13).
7. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 6, which is characterized in that: the end cover (12) is fixedly connected with the outer sleeve (13) through a fixing screw (121), and the outer diameter of the end cover (12) is larger than the expanded outer diameter of the outer sleeve (13).
8. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 2, which is characterized in that: the nut groove (21) is a hexagonal groove, and the rotating groove (22) is a square groove.
9. The expansion type pin shaft for mounting the standard section of the tower crane according to claim 1, which is characterized in that: an electromagnet is arranged in the pin shaft wrench (2).
10. The use method of the expansion type pin shaft for the installation of the tower crane standard knot as claimed in any one of claims 1 to 9, is characterized by comprising the following steps:
s1, assembling the pin shaft: firstly, a locking elastic sheet (14) is arranged in a groove of an outer sleeve (13), then an expansion inner column (11) is inserted to clamp the locking elastic sheet (14), and then an end cover (12) and a locking nut (16) are sequentially arranged;
s2, standard section butt joint: separating the standard knot of the tower crane from the slewing device of the tower crane, and installing a new standard knot on the lower part of the slewing device of the tower crane;
s3, inserting a pin: inserting the assembled pin shaft into the mounting hole of the standard knot, and then mounting a safety pin (15) on the pin shaft;
s4, expanding and locking: the expansion inner column (11) and the locking nut (16) are clamped by the pin shaft wrench (2), so that the expansion inner column (11) moves outwards, the locking elastic sheet (14) is forced to expand in place to clamp the mounting hole, and then the pin shaft wrench (2) is taken down to complete mounting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269607.5A CN111486163B (en) | 2020-04-08 | 2020-04-08 | Expansion type pin shaft for mounting standard section of tower crane and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269607.5A CN111486163B (en) | 2020-04-08 | 2020-04-08 | Expansion type pin shaft for mounting standard section of tower crane and use method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111486163A true CN111486163A (en) | 2020-08-04 |
| CN111486163B CN111486163B (en) | 2021-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010269607.5A Active CN111486163B (en) | 2020-04-08 | 2020-04-08 | Expansion type pin shaft for mounting standard section of tower crane and use method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111486163B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494203A (en) * | 2021-07-05 | 2021-10-12 | 昌达建筑科技有限公司 | Portable wallboard floor connection structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2259269A (en) * | 1940-05-14 | 1941-10-14 | John L Ruth | Universal nut |
| DE2460431A1 (en) * | 1974-12-20 | 1976-06-24 | Kunststoff Gmbh | Plastic anchor plug with detachable wedge nut - is installed by pulling nut into split centre section |
| CN204572677U (en) * | 2015-03-27 | 2015-08-19 | 杭州林恩建筑技术有限公司 | Cut end crab-bolt |
| CN106438638A (en) * | 2015-08-06 | 2017-02-22 | 杨东佐 | Fastening and connecting assembly and structure, disassembling method, track structure, crankshaft connecting rod system, bone connecting device and bone connecting method |
| CN207830305U (en) * | 2018-01-29 | 2018-09-07 | 山东旭天标识工程有限公司 | Expansion bolt and expansion bolt assembly |
| CN209671366U (en) * | 2019-01-21 | 2019-11-22 | 刘韦明 | Compound expansion connector |
-
2020
- 2020-04-08 CN CN202010269607.5A patent/CN111486163B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2259269A (en) * | 1940-05-14 | 1941-10-14 | John L Ruth | Universal nut |
| DE2460431A1 (en) * | 1974-12-20 | 1976-06-24 | Kunststoff Gmbh | Plastic anchor plug with detachable wedge nut - is installed by pulling nut into split centre section |
| CN204572677U (en) * | 2015-03-27 | 2015-08-19 | 杭州林恩建筑技术有限公司 | Cut end crab-bolt |
| CN106438638A (en) * | 2015-08-06 | 2017-02-22 | 杨东佐 | Fastening and connecting assembly and structure, disassembling method, track structure, crankshaft connecting rod system, bone connecting device and bone connecting method |
| CN207830305U (en) * | 2018-01-29 | 2018-09-07 | 山东旭天标识工程有限公司 | Expansion bolt and expansion bolt assembly |
| CN209671366U (en) * | 2019-01-21 | 2019-11-22 | 刘韦明 | Compound expansion connector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494203A (en) * | 2021-07-05 | 2021-10-12 | 昌达建筑科技有限公司 | Portable wallboard floor connection structure |
| CN113494203B (en) * | 2021-07-05 | 2022-07-08 | 昌达建筑科技有限公司 | Portable wallboard floor connection structure |
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| Publication number | Publication date |
|---|---|
| CN111486163B (en) | 2021-09-21 |
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