CN211950012U - Electromechanical dual-purpose electronic padlock - Google Patents
Electromechanical dual-purpose electronic padlock Download PDFInfo
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- CN211950012U CN211950012U CN202020025714.9U CN202020025714U CN211950012U CN 211950012 U CN211950012 U CN 211950012U CN 202020025714 U CN202020025714 U CN 202020025714U CN 211950012 U CN211950012 U CN 211950012U
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- lock
- sleeve
- hook
- ball
- hole
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- 230000009977 dual effect Effects 0.000 claims description 7
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses an electromechanical dual-purpose electronic padlock, which comprises a lock body, a lock hook arranged on the lock body, an electrical switch lock component, a lock core, a switch lock signal receiving control module and a power supply; the lock body is provided with a lock hole and a pivot hole, a sleeve capable of sliding up and down is arranged in the pivot hole, and the sleeve is provided with a window; one end of the lock hook can extend into the sleeve in a sliding manner, and a clamping position for clamping the ball to limit the sliding of the lock hook is arranged at one end of the lock hook; the other end of the latch hook is matched with the latch hole; the electric switch lock assembly comprises a motor, a sliding block and a ball, wherein a shifting head for shifting the sliding block is arranged at the output end of the motor; the ball is arranged corresponding to the window and is shifted to move by the slide block; the motor is respectively connected with the switch lock signal receiving control module and the power supply, and the switch lock signal receiving control module controls the motor to drive the sliding block to move so as to push the ball into or separate from the clamping position, so that the other end of the lock hook is rejected to separate from the lock hole to lock or the other end of the lock hook is allowed to separate from the lock hole to unlock.
Description
Technical Field
The utility model relates to a padlock field technique especially indicates an electromechanical dual purpose electronic padlock.
Background
Padlocks are the oldest and bulky families in the world of locks, and other locks are said to be derived from padlocks and other doors. The lock body of the padlock is provided with a metal stem which can be buckled and connected in a ring shape or a straight shape, namely a 'lock beam', so that the padlock is directly buckled with the lock body through the lock beam to form a closed lock. With the development of science and technology, the application of electronic padlocks is more and more common, for example: file management, escort service, mini warehousing, consignment transportation, transportation of high value-added tax goods such as cigarettes and the like.
However, the prior art electronic padlocks still have some disadvantages, such as: the traditional electronic padlock generally comprises a lock body, a lock hook and a lock cylinder, wherein a left lock rod and a right lock rod are arranged in the lock body, a motor is used for stirring the left lock rod and the right lock rod to extend into a left end groove corresponding to the lock hook and a lock hook limited by a right end groove so as to realize locking or unlocking without being limited by a lock hole, wherein one end of the lock hook is pulled to be separated from the lock body, and the lock body is complex in internal structure and poor in transmission stability due to the adoption of a double-lock rod structure.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an electromechanical dual-purpose electronic padlock, which is reasonable in structure and effectively solves the problems of complicated structure and poor transmission stability of the existing electronic padlock due to the double-lock rod structure.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an electromechanical dual-purpose electronic padlock comprises a lock body, a lock hook arranged on the lock body, an electrical switch lock assembly, a lock cylinder, a switch lock signal receiving control module and a power supply;
the lock body is provided with a lock hole and a pivot hole, a sleeve capable of sliding up and down is arranged in the pivot hole, and the sleeve is provided with a window;
one end of the lock hook can extend into the sleeve in a sliding manner, and a clamping position for clamping the ball to limit the sliding of the lock hook is arranged at one end of the lock hook; the other end of the latch hook is matched with the latch hole;
the electric switch lock assembly comprises a motor, a sliding block and a ball, wherein a shifting head for shifting the sliding block is arranged at the output end of the motor; the ball is arranged corresponding to the window and is shifted to move by the slide block;
the motor is respectively connected with the switch lock signal receiving control module and the power supply, and the switch lock signal receiving control module controls the motor to drive the sliding block to move so as to push the ball into or separate from the clamping position, so that the other end of the lock hook is refused to separate from the lock hole to lock or the other end of the lock hook is allowed to separate from the lock hole to unlock;
the core shaft of the lock core extends into the sleeve, and the core shaft can be selectively rotated after a key is inserted into the lock core, so that the sleeve is unlocked to allow the sleeve to slide upwards or lock the sleeve.
As a preferred embodiment: the shifting block is eccentrically arranged at the output end of the motor, and the sliding block is provided with a first limited cavity; the shifting block is rotatably arranged in the first limited cavity.
As a preferred embodiment: the side surface of the sliding block is provided with an arc concave position, and the radian of the arc concave position is equal to that of the sleeve; the ball bearing is propped against the arc concave position.
As a preferred embodiment: the clamping position comprises a first clamping position and a second clamping position, and a connecting concave surface is arranged between the first clamping position and the second clamping position; after the ball is separated from the first clamping position, the lock hook slides, and the ball is clamped in the second clamping position through the connecting concave surface.
As a preferred embodiment: the top of second screens is located to first screens, and this first screens is circular concave point, and this second screens is circular recess, and the degree of depth of second screens is less than the degree of depth of first screens.
As a preferred embodiment: the upper end of the mandrel is provided with a locking block, and the sleeve is provided with an unlocking hole;
when the mandrel rotates to the first position, the locking block is limited to the outer peripheral part of the unlocking hole on the sleeve;
when the mandrel rotates to the second position, the downward orthographic projection of the locking block is positioned in the unlocking hole, at the moment, the locking hook is pulled upwards, the sleeve slides upwards, and the other end of the locking hook is disengaged upwards from the locking hole to realize unlocking.
As a preferred embodiment: the bottom of the sleeve is provided with a limiting block, and the limiting block is provided with a limited concave position for limiting the rotation stroke of the mandrel; the lock core is provided with a limiting convex block, and the limiting concave position can be selectively limited by the limiting convex block.
As a preferred embodiment: an elastic element is arranged between one end of the lock hook and the sleeve;
when the motor drives the sliding block to move so as to push the ball into the clamping position, the elastic element is in an elastic deformation state;
when the motor drives the sliding block to move to separate the ball from the clamping position, the elastic resetting acting force of the elastic element upwards supports one end of the lock hook, and meanwhile, the other end of the lock hook is separated from the lock hole to unlock.
Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme: through the arranged electric switch lock assembly, the motor of the electric switch lock assembly drives the sliding block to push the ball into or separate from the clamping position, so that the other end of the lock hook is refused to separate from the lock hole to lock or the other end of the lock hook is allowed to separate from the lock hole to unlock; therefore, the whole structure of the electric switch lock assembly is simplified, and compared with the traditional electronic padlock adopting a double-lock rod structure, the electric switch lock assembly is simpler in structure and better in transmission stability;
one end of the lock hook can extend into the sleeve in a sliding way by installing the sleeve in the pivot hole; when a key is used for mechanically opening and closing the lock (usually, when electrical unlocking cannot be normally carried out, emergency unlocking is carried out by using the key), the core shaft can be selectively rotated after the key is inserted to rotate the lock cylinder, so that the sleeve is unlocked to allow the sleeve to slide upwards or be locked; the electronic padlock integrates the functions of an electrical switch and a mechanical switch, and particularly, the electronic padlock has a simple and ingenious structure, realizes the compact arrangement of the structure of an electromechanical dual-purpose lock, and is favorable for the design space arrangement of the whole padlock;
the padlock has good anti-theft performance, and is mainly but not limited to industrial locks and other applications.
To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic perspective view of a preferred embodiment of the present invention;
FIG. 2 is an exploded view of the preferred embodiment of the present invention;
fig. 3 is a further exploded perspective view of the preferred embodiment of the present invention;
FIG. 4 is a first cross-sectional view of the preferred embodiment of the present invention;
fig. 5 is a partially exploded view of the preferred embodiment of the present invention;
fig. 6 is an exploded view of the lock cylinder and sleeve of the preferred embodiment of the present invention.
The attached drawings indicate the following:
10. lock body 101 and fixed frame body
102. Lock shell 11 and lock hole
12. Pin joint hole 13, sleeve
131. Unlocking hole 132 and limiting block
1321. Restricted concave position 14, window
20. Latch hook 21, screens
211. A first clip 212 and a second clip
22. Connecting concave surface 30 and electric switch lock assembly
31. Motor 311 and shifting block
32. Slider 321, first confined Cavity
322. Arc concave position 33, ball
40. Lock core 41 and core shaft
411. Locking block 42, limiting lug
50. Switch lock signal receiving module 60 and power supply
70. An elastic element.
Detailed Description
Referring to fig. 1 to 6, a specific structure of a preferred embodiment of the present invention is shown, which is an electromechanical dual-purpose electronic padlock, including a lock body 10, a latch hook 20, an electrical switch lock assembly 30, a lock cylinder 40, a switch lock signal receiving module 50 and a power supply 60.
The lock body 10 has a lock hole 11 and a pivot hole 12, a sleeve 13 capable of sliding up and down is installed in the pivot hole 12, and the sleeve 13 is provided with a window 14. In the embodiment of the present application, the lock body 10 is composed of a fixed frame 101 and a lock case 102 covering the outer periphery of the fixed frame, the lock hole 11 is disposed on the lock case 102, the pivot hole 12 is disposed in the fixed frame 101, and the center of the lock hole 11 and the center of the pivot hole 12 are located on the same straight line; the lock case 102 is provided with an escape window for exposing the pivot hole 12 directly above the pivot hole 12. The lock hook 20, the electrical switch lock assembly 30, the lock cylinder 40, the switch lock signal receiving module 50 and the power supply 60 are all installed in a fixed frame, the switch lock signal structure module 50 is respectively connected with a motor and corresponding intelligent terminal equipment (such as a mobile phone, wearable equipment, a fingerprint, an electronic card and the like), management software is installed on the intelligent terminal equipment for management, the intelligent terminal equipment sends an unlocking and locking instruction to the electrical switch lock assembly 30, and the padlock switch state is managed and monitored through the intelligent terminal equipment.
One end of the locking hook 20 can be extended into the sleeve 13 in a sliding manner, and one end of the locking hook 20 is provided with a clamping position 21 for clamping the ball 33 to limit the sliding of the locking hook 20; the other end of the latch hook 20 is fitted into the latch hole 11; in the embodiment of the present application, the detent 21 includes a first detent 211 and a second detent 212, and a concave connection surface 22 is disposed between the first detent 211 and the second detent 212; after the ball 33 is separated from the first detent 211, the latch hook 20 slides, so that the ball 33 is engaged with the second detent 212 through the concave connection surface 22; the lock mainly uses the up-and-down movement of the restricted lock hook 20 through the first clip 211, and uses the second clip 212 to prevent the lock hook 20 from separating from the lock body; therefore, the up-and-down sliding of the lock hook can be limited when the lock is opened and closed by simply arranging the ball; the structure is simple, and the use reliability is good. More specifically, the first detent 211 is disposed above the second detent 212, the first detent 211 is a circular concave point, the second detent 212 is a circular concave groove, and the depth of the second detent is smaller than the depth of the first detent.
The electric switch lock assembly 30 comprises a motor 31, a slide block 32 and a ball 33, wherein the output end of the motor 31 is provided with a shifting block 311 for shifting the slide block; the ball 33 is installed corresponding to the window 14, and the slide block 32 drives the ball 33 to move. In the embodiment of the present application, the motor 31 is connected to the unlocking/locking signal receiving control module 50 and the power supply 60, and the unlocking/locking signal receiving control module 50 controls the motor 31 to drive the sliding block 32 to move to push the ball 33 into or out of the detent 21, so as to reject the other end of the locking hook 20 to disengage from the locking hole 11 to lock or allow the other end of the locking hook 20 to disengage from the locking hole 21 to unlock. Specifically, the shifting block 311 is eccentrically disposed at the output end of the motor 31, and the sliding block 32 is provided with a first limited cavity 321; the shifting block 311 is rotatably disposed in the first restricted cavity 321. The shifting block 311 is eccentrically arranged and limited in the first limited cavity 321, and when the motor 31 is rotated, the shifting block can be rotated to shift the sliding block 32 to move. The side of the slide block 32 is provided with an arc concave position 322, and the radian of the arc concave position 322 is equal to that of the sleeve 13; the ball 33 abuts against the arc-shaped concave position 322; the slide block 32 can move transversely to a reserved position when approaching the sleeve 13 through the arranged arc-shaped concave position 322.
The spindle 41 of the key cylinder 40 extends into the sleeve 13, and the spindle 41 can be selectively rotated after a key is inserted into the key cylinder 40, thereby unlocking the sleeve 13 to allow the sleeve 13 to slide upward or lock the sleeve 13. In the embodiment of the present application, the upper end of the mandrel 41 has a locking block 411, and the sleeve 13 has an unlocking hole 131, and the unlocking hole 131 is located at the center of the bottom of the sleeve 13. When the spindle 41 rotates to the first position, the locking block 411 is limited to the outer circumference of the sleeve 13 corresponding to the unlocking hole 131; when the spindle 41 rotates to the second position, the downward orthographic projection of the locking block 411 is located in the unlocking hole 131, at this time, the locking hook 20 is pulled upwards, the sleeve 13 slides upwards, and the other end of the locking hook 20 is pulled out upwards from the locking hole 11 to realize unlocking. And the sleeve 13 is arranged, if manual mechanical switch lock is carried out through the lock core, the core shaft 41 is directly separated from the limit of the sleeve, the lock hook can be pulled to slide to unlock, and the operation of the electric switch lock cannot be interfered in the process.
Preferably, the bottom of the sleeve 13 is provided with a limiting block 132, and the limiting block 132 is provided with a limited concave portion 1321 for limiting the rotation stroke of the mandrel 41; the lock core 40 is provided with a limit protrusion 42, and the limited recess 1321 can be selectively limited by the limit protrusion 42. The limited concave 1321 and the limit bump 42 are matched to limit the rotation of the spindle 41 by a certain stroke, so that the spindle 41 can be switched to the first position and the second position.
An elastic element 70 is arranged between one end of the latch hook 20 and the sleeve 13, and the elastic element 70 is preferably a spring; when the motor 31 drives the slide block 32 to move so as to push the ball 33 into the detent 21, the elastic element 70 is in an elastic deformation state; when the motor 31 drives the slider 32 to move to disengage the ball 33 from the detent 21, the elastic restoring force of the elastic element 70 pushes one end of the locking hook 20 upward, and simultaneously disengages the other end of the locking hook 20 from the locking hole 21 to unlock the lock. Meanwhile, the elastic element 70 can also provide the anti-falling effect; for example, the force applied to the shackle to damage the internal components of the electronic padlock when the electronic padlock is dropped can be avoided.
Next, the operation principle of the electromechanical dual-purpose electronic padlock of the present invention is roughly described as follows:
when the electric lock is unlocked, the intelligent terminal equipment sends an unlocking instruction; after the unlocking command is received by the unlocking and locking signal receiving module, the motor is controlled to rotate, so that the sliding block moves a certain distance towards one end far away from the sleeve; after the ball is separated from the first clamping position, the elastic resetting acting force of the elastic element pushes one end of the lock hook upwards; after the lock hook integrally slides upwards for a certain distance, the ball slides from the first clamping position to the second clamping position, and the limited lock hook continues to move upwards, and at the moment, the other end of the lock hook is separated from the lock hole to unlock;
when the lock is electrically closed, the other end of the lock hook is aligned to the lock hole and the lock hook is pressed down to move down integrally, so that the ball slides to the first clamping position from the second clamping position; the locking hook moves downwards to enable the reset elastic element to generate elastic force, meanwhile, the locking and unlocking signal receiving module receives a locking and unlocking command, and the driving motor rotates to stir the sliding block to move towards one end of the sleeve to enable the ball to be clamped in the first clamping position;
when the mechanical unlocking is carried out, a key is inserted into the lock cylinder, so that the lock cylinder is unlocked, and the core shaft is rotated to a second position; at the moment, the locking hook is pulled upwards, the sleeve slides upwards, and the other end of the locking hook is pulled out upwards from the locking hole to be unlocked;
when the lock is mechanically closed, the other end of the lock hook is aligned to the lock hole and inserted into the lock hole, the core shaft is rotated to the first position to move upwards through the limited sleeve, and the lock can be closed after the key is pulled out.
The utility model discloses a design focus lies in: through the arranged electric switch lock assembly, the motor of the electric switch lock assembly drives the sliding block to push the ball into or separate from the clamping position, so that the other end of the lock hook is refused to separate from the lock hole to lock or the other end of the lock hook is allowed to separate from the lock hole to unlock; therefore, the whole structure of the electric switch lock assembly is simplified, and compared with the traditional electronic padlock adopting a double-lock rod structure, the electric switch lock assembly is simpler in structure and better in transmission stability;
one end of the lock hook can extend into the sleeve in a sliding way by installing the sleeve in the pivot hole; when a key is used for mechanically opening and closing the lock (usually, when electrical unlocking cannot be normally carried out, emergency unlocking is carried out by using the key), the core shaft can be selectively rotated after the key is inserted to rotate the lock cylinder, so that the sleeve is unlocked to allow the sleeve to slide upwards or be locked; the electronic padlock integrates the functions of an electrical switch and a mechanical switch, and particularly, the electronic padlock has a simple and ingenious structure, realizes the compact arrangement of the structure of an electromechanical dual-purpose lock, and is favorable for the design space arrangement of the whole padlock;
the padlock has good anti-theft performance, and is mainly but not limited to industrial locks and other applications.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (8)
1. An electromechanical dual-purpose electronic padlock which is characterized in that: the lock comprises a lock body (10), a lock hook (20) arranged on the lock body (10), an electric switch lock assembly (30), a lock core (40), a switch lock signal receiving control module (50) and a power supply (60);
the lock body (10) is provided with a lock hole (11) and a pivot hole (12), a sleeve (13) which can slide up and down is arranged in the pivot hole (12), and the sleeve (13) is provided with a window (14);
one end of the lock hook (20) can extend into the sleeve (13) in a sliding way, and one end of the lock hook (20) is provided with a clamping position (21) for clamping the ball (33) so as to limit the lock hook (20) to slide; the other end of the latch hook (20) is adapted to the latch hole (11);
the electric switch lock assembly (30) comprises a motor (31), a sliding block (32) and a rolling ball (33), wherein a shifting head (311) for shifting the sliding block is arranged at the output end of the motor (31); the ball (33) is arranged corresponding to the window (14), and the ball (33) is shifted to move by the slide block (32);
the motor (31) is respectively connected with the switch lock signal receiving control module (50) and the power supply (60), the switch lock signal receiving control module (50) controls the motor (31) to drive the sliding block (32) to move so as to push the ball (33) into or separate from the clamping position (21), and therefore the other end of the lock hook (20) is refused to separate from the lock hole (11) to lock or the other end of the lock hook (20) is allowed to separate from the lock hole (11) to unlock;
the core shaft (41) of the lock core (40) extends into the sleeve (13), and the core shaft (41) can be selectively rotated after a key is inserted into the lock core (40), so that the sleeve (13) is unlocked to allow the sleeve (13) to slide upwards or lock the sleeve (13).
2. An electromechanical dual purpose electronic padlock as claimed in claim 1, wherein: the shifting block (311) is eccentrically arranged at the output end of the motor, and the sliding block (32) is provided with a first limited cavity (321); the shifting block (311) is rotatably arranged in the first limited cavity (321).
3. An electromechanical dual purpose electronic padlock as claimed in claim 1, wherein: an arc concave position (322) is arranged on the side surface of the sliding block (32), and the radian of the arc concave position (322) is equal to that of the sleeve (13); the ball (33) is pressed against the arc-shaped concave position (322).
4. An electromechanical dual purpose electronic padlock as claimed in claim 1, wherein: the clip (21) comprises a first clip (211) and a second clip (212), and a connecting concave surface (22) is arranged between the first clip (211) and the second clip (212); after the ball (33) is separated from the first clamping position (211), the locking hook (20) slides, so that the ball (33) is clamped in the second clamping position (212) through the connecting concave surface (22).
5. An electromechanical electronic padlock as claimed in claim 4, wherein: the first screens (211) are arranged above the second screens (212), the first screens (211) are circular concave points, the second screens (212) are circular grooves, and the depth of the second screens is smaller than that of the first screens.
6. An electromechanical dual purpose electronic padlock as claimed in claim 1, wherein: the upper end of the mandrel (41) is provided with a locking block (411), and the sleeve (13) is provided with an unlocking hole (131);
when the mandrel (41) rotates to the first position, the locking block (411) is limited to the outer peripheral part of the sleeve (13) corresponding to the unlocking hole (131);
when the mandrel (41) rotates to the second position, the downward orthographic projection of the locking block (411) is located in the unlocking hole (131), at the moment, the locking hook (20) is pulled upwards, the sleeve (13) slides upwards, and the other end of the locking hook (20) is pulled out upwards from the unlocking hole (11) to realize unlocking.
7. An electromechanical dual purpose electronic padlock as claimed in claim 1, wherein: the bottom of the sleeve (13) is provided with a limiting block (132), and the limiting block (132) is provided with a limited concave position (1321) for limiting the rotation stroke of the mandrel (41); the lock core (40) is provided with a limiting convex block (42), and the limited concave position (1321) can be selectively limited by the limiting convex block (42).
8. An electromechanical dual purpose electronic padlock as claimed in claim 1, wherein: an elastic element (70) is arranged between one end of the lock hook (20) and the sleeve (13);
when the motor (31) drives the sliding block (32) to move so as to push the ball (33) into the clamping position (21), the elastic element (70) is in an elastic deformation state;
when the motor (31) drives the sliding block (32) to move so as to separate the ball (33) from the clamping position (21), the elastic reset acting force of the elastic element (70) pushes one end of the locking hook (20) upwards, and simultaneously the other end of the locking hook (20) is separated from the locking hole (11) so as to unlock the lock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020025714.9U CN211950012U (en) | 2020-01-07 | 2020-01-07 | Electromechanical dual-purpose electronic padlock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020025714.9U CN211950012U (en) | 2020-01-07 | 2020-01-07 | Electromechanical dual-purpose electronic padlock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211950012U true CN211950012U (en) | 2020-11-17 |
Family
ID=73184330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020025714.9U Expired - Fee Related CN211950012U (en) | 2020-01-07 | 2020-01-07 | Electromechanical dual-purpose electronic padlock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211950012U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115807387A (en) * | 2022-11-30 | 2023-03-17 | 中交四航局第一工程有限公司 | Small-radius curve large-gradient narrow-width ramp bridge girder erection machine and construction method |
-
2020
- 2020-01-07 CN CN202020025714.9U patent/CN211950012U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115807387A (en) * | 2022-11-30 | 2023-03-17 | 中交四航局第一工程有限公司 | Small-radius curve large-gradient narrow-width ramp bridge girder erection machine and construction method |
| CN115807387B (en) * | 2022-11-30 | 2024-01-16 | 中交四航局第一工程有限公司 | Bridge girder erection machine with small radius curve and large gradient and narrow ramp and construction method |
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Granted publication date: 20201117 |