CN110980561B - Harbour crane jib loading boom slewer - Google Patents
Harbour crane jib loading boom slewer Download PDFInfo
- Publication number
- CN110980561B CN110980561B CN201911291351.1A CN201911291351A CN110980561B CN 110980561 B CN110980561 B CN 110980561B CN 201911291351 A CN201911291351 A CN 201911291351A CN 110980561 B CN110980561 B CN 110980561B
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- seat
- bearing
- locking
- adjusting
- screw rod
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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
- B66C23/84—Slewing gear
-
- 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
- F16N—LUBRICATING
- F16N11/00—Arrangements for supplying grease from a stationary reservoir or the equivalent in or on the machine or member to be lubricated; Grease cups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a slewing device for a crane boom of a port crane, which comprises a base, a fixing hole, a supporting seat, an adjusting seat, a sealing ring, a lower bearing, an upper bearing, a side bearing, an oil injection device, a connecting seat, a fixing screw, a slewing seat, a mounting hole and the like; the lower bearing arranged in the invention can meet the requirement of a crane on larger bearing pressure, and can meet the requirement of larger torque by matching with the upper bearing, thereby ensuring the stability and reliability in rotation; the oil injection device provided by the invention can inject oil to the bearing in the rotary seat, thereby reducing resistance and improving the effect of long-time use; according to the invention, the adjusting head is rotated by the inner hexagonal wrench, so that the height of the adjusting seat can be adjusted by radially moving the inclined block, the influence on the use reliability and stability due to the gap between the upper part and the lower part of the bearing is avoided, and in addition, great convenience is brought to later maintenance and adjustment.
Description
Technical Field
The invention relates to the technical field of port cranes, in particular to a boom rotating device of a port crane.
Background
The port crane is generally a full-rotation arm support crane arranged along the ground and is provided with working mechanisms for lifting, amplitude variation, rotation, operation and the like; the working place is relatively fixed; the working range is large, the slewing device generally adopts a simpler structure, but the bearing pressure ratio on the slewing device is larger, and the moment is very large, so that the slewing device is easy to deform when in use, so that the gap at the joint is larger, and the subsequent maintenance is also troublesome and inconvenient.
Disclosure of Invention
The invention aims to solve the problems that a boom slewing device of a port crane is easy to deform during use, so that a gap at a joint is relatively large, and in addition, the subsequent maintenance is relatively troublesome and inconvenient.
In order to solve the above problems, the present invention provides a technical solution: the utility model provides a harbour crane jib loading boom slewer which innovation point lies in: the oil injection device comprises a base, a fixing hole, a supporting seat, an adjusting seat, a sealing ring, a lower bearing, an upper bearing, a side bearing, an oil injection device, an oil injection hole, a top cover, a connecting seat, a fixing screw, a rotary seat and a mounting hole; a plurality of fixing holes are uniformly formed in the periphery of the base; the lower side of the supporting seat is fixedly connected in the center of the upper side of the base, and the center outside the supporting seat is vertically and movably connected with an adjusting seat; the connecting seat is fixedly connected to the center of the upper side of the supporting seat through a plurality of fixing screws; the inner boss at the lower side of the rotary seat is positioned between the bottom surface of the connecting seat and the top surface of the adjusting seat, and a sealing ring is arranged between the edge of the bottom surface of the rotary seat and the edge of the top surface of the adjusting seat; the lower bearing is arranged between the bottom surface of the rotary seat and the top surface of the adjusting seat; the upper bearing is arranged between the top surface of the inner boss at the lower side of the rotary seat and the bottom surface of the connecting seat; the side bearing is arranged between the side surface of the connecting seat and the inner side surface of the rotary seat; the oil injection hole is formed in the left upper side of the rotary seat, an outlet in the inner side of the oil injection hole is communicated with the upper side of the interior of the rotary seat, and an inlet in the outer side of the oil injection hole is provided with an oil injection device; the top cover is fixedly connected in an opening at the upper side of the rotary seat; the mounting holes are a plurality of and are uniformly arranged in the edges around the upper side of the adjusting seat.
Preferably, the device also comprises a connecting gear, a side gear, a first screw rod, an inclined block, a lower inclined plane, an upper inclined plane, an adjusting head, a locking head, a guide groove, a second screw rod, an internal thread, a guide hole, a locking block, a locking cylinder and a bottom cover body; the connecting gear is movably connected to the upper side of the inner part below the supporting seat; the guide grooves are arranged in the edge of the upper side of the base in a circular manner, and inclined blocks are movably connected in the guide grooves; the top surfaces of the inclined blocks are respectively provided with an upper inclined plane, and a first screw rod is movably connected in a threaded hole in the center of each inclined block; the inner side of the screw rod is movably connected in corresponding radial holes on the periphery of the lower side of the supporting seat respectively, the outer side end of the screw rod is fixedly connected with an adjusting head, the inner side end of the screw rod is fixedly connected with a side gear, and the side gears are connected with a connecting gear; the lower inclined planes are a plurality of and are respectively connected with the corresponding upper inclined planes, and the upper inclined planes are all arranged at the corresponding positions at the bottom of the adjusting seat; the guide holes are uniformly arranged in the periphery of the inner part of the lower side of the supporting seat respectively, and internal threads are arranged in the outer sides of the guide holes; the bottom cover body is fixedly connected in an opening at the lower side of the supporting seat, a locking column body is movably connected inside the bottom cover body, and the center of the locking column body is fixedly connected on a shaft at the lower side of the connecting gear; the locking blocks are respectively movably connected in the corresponding guide holes, and the inner sides of the locking blocks are respectively connected with the outer circular surface of the locking cylinder through corresponding through holes on the periphery of the bottom cover body; the second screw rod is a plurality of screws, the external threads on the inner sides of the second screw rod are respectively and movably connected into corresponding internal threads, the end faces of the inner sides of the second screw rod are respectively connected with the outer side faces of corresponding locking blocks, the outer sides of the second screw rod are respectively and movably connected into corresponding radial holes on the periphery of the upper side of the base, and locking heads are fixedly connected to the end portions of the outer sides of the second screw rod.
Preferably, the oil injection device is a press-fit type pressure injection oil cup.
Preferably, a sealing ring is arranged between the inner side surface of the adjusting seat and the outer side surface of the supporting seat.
Preferably, the cap is a seal cap.
Preferably, the lower bearing is a thrust ball bearing.
Preferably, the upper bearing is a thrust ball bearing.
Preferably, the outer sides of the adjusting heads are provided with inner hexagonal holes.
Preferably, the outer sides of the locking heads are provided with hexagon socket holes.
The invention has the beneficial effects that:
(1) the invention has the advantages of reasonable and simple structure, low production cost and convenient installation, the lower bearing arranged here can meet the requirement of the crane on larger bearing pressure, and the lower bearing can meet the requirement of larger torque by matching with the upper bearing, thereby ensuring the stability and reliability in rotation.
(2) The oil injection device provided by the invention can inject oil to the bearing in the rotary seat, thereby reducing resistance and improving the effect of long-time use.
(3) According to the invention, the locking head is loosened through the inner hexagonal wrench, so that the locking block can be driven to be separated from the locking cylinder, and the height of the adjusting seat can be conveniently adjusted.
(4) According to the invention, the adjusting head is rotated by the inner hexagonal wrench, so that the height of the adjusting seat can be adjusted by radially moving the inclined block, the influence on the use reliability and stability due to the gap between the upper part and the lower part of the bearing is avoided, and in addition, great convenience is brought to later maintenance and adjustment.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partially enlarged view of the present invention.
Fig. 3 is a partial top view of the present invention.
1-a base; 2-fixing holes; 3-a support seat; 4-an adjusting seat; 5-a sealing ring; 6-lower bearing; 7-an upper bearing; an 8-side bearing; 9-an oiling device; 10-oil filler hole; 11-a top cover; 12-a connecting seat; 13-a set screw; 14-a turret; 15-mounting holes; 16-connecting gear; 17-side gear; 18-screw rod one; 19-a sloping block; 20-lower inclined plane; 21-upper inclined plane; 22-an adjustment head; 23-a locking head; 24-a guide groove; 25-screw II; 26-internal threads; 27-a guide hole; 28-a locking block; 29-locking cylinder; 30-bottom cover body.
Detailed Description
As shown in fig. 1 to 3, the following technical solutions are adopted in the present embodiment: a slewing device for a cargo boom of a port crane comprises a base 1, a fixing hole 2, a supporting seat 3, an adjusting seat 4, a sealing ring 5, a lower bearing 6, an upper bearing 7, a side bearing 8, an oil injection device 9, an oil injection hole 10, a top cover 11, a connecting seat 12, a fixing screw 13, a slewing seat 14 and a mounting hole 15; a plurality of fixing holes 2 are uniformly formed in the periphery of the base 1; the lower side of the supporting seat 3 is fixedly connected in the center of the upper side of the base 1, and the center of the outer part of the supporting seat 3 is vertically and movably connected with an adjusting seat 4; the connecting seat 12 is fixedly connected to the center of the upper side of the supporting seat 3 through a plurality of fixing screws 13; an inner boss at the lower side of the rotary seat 14 is positioned between the bottom surface of the connecting seat 12 and the top surface of the adjusting seat 4, and a sealing ring 5 is arranged between the edge of the bottom surface of the rotary seat 14 and the edge of the top surface of the adjusting seat 4; the lower bearing 6 is arranged between the bottom surface of the rotary seat 14 and the top surface of the adjusting seat 4; the upper bearing 7 is arranged between the top surface of the inner boss at the lower side of the rotary seat 14 and the bottom surface of the connecting seat 12; the side bearing 8 is arranged between the side surface of the connecting seat 12 and the inner side surface of the rotary seat 14; the oil filling hole 10 is formed in the left upper side of the rotary seat 14, an outlet at the inner side of the oil filling hole 10 is communicated with the inner upper side of the rotary seat 14, and an inlet at the outer side of the oil filling hole 10 is provided with an oil filling device 9; the top cover 11 is fixedly connected in an opening at the upper side of the rotary seat 14; the mounting holes 15 are a plurality of, and the mounting holes 15 are uniformly arranged in the edges on the periphery of the upper side of the adjusting seat 4.
The device also comprises a connecting gear 16, a side gear 17, a first screw rod 18, an inclined block 19, a lower inclined surface 20, an upper inclined surface 21, an adjusting head 22, a locking head 23, a guide groove 24, a second screw rod 25, an internal thread 26, a guide hole 27, a locking block 28, a locking cylinder 29 and a bottom cover body 30; the connecting gear 16 is movably connected to the upper side of the inner part below the supporting seat 3; the guide grooves 24 are a plurality of guide grooves 24, the guide grooves 24 are circularly arranged in the edge of the upper side of the base 1, and the guide grooves 24 are movably connected with inclined blocks 19; the top surfaces of the inclined blocks 19 are respectively provided with an upper inclined plane 21, and the threaded holes in the centers of the inclined blocks 19 are respectively and movably connected with a first screw rod 18; the inner sides of the first screws 18 are movably connected in corresponding radial holes on the periphery of the lower side of the support seat 3 respectively, the outer side ends of the first screws 18 are fixedly connected with adjusting heads 22, the inner side ends of the first screws 18 are fixedly connected with side gears 17, and the side gears 17 are connected with connecting gears 16; the number of the lower inclined planes 20 is several, the lower inclined planes 20 are respectively connected with corresponding upper inclined planes 21, and the upper inclined planes 21 are all arranged at corresponding positions at the bottom of the adjusting seat 4; the guide holes 27 are a plurality of, the guide holes 27 are respectively and uniformly arranged in the periphery of the inner part of the lower side of the support seat 3, and the outer sides of the guide holes 27 are respectively provided with internal threads 26; the bottom cover body 30 is fixedly connected in an opening at the lower side of the supporting seat 3, a locking column 29 is movably connected in the bottom cover body 30, and the center of the locking column 29 is fixedly connected on a lower shaft of the connecting gear 16; the number of the locking blocks 28 is several, the locking blocks 28 are movably connected in the corresponding guide holes 27, and the inner sides of the locking blocks 28 are connected with the outer circular surface of the locking cylinder 29 through the corresponding through holes around the bottom cover body 30; the second screw rod 25 is a plurality of screws, the inner side external threads of the second screw rod 25 are respectively and movably connected into the corresponding internal threads 26, the inner side end faces of the second screw rod 25 are respectively connected with the outer side faces of the corresponding locking blocks 28, the outer sides of the second screw rod 25 are respectively and movably connected into the corresponding radial holes on the periphery of the upper side of the base 1, and the outer side end portions of the second screw rod 25 are fixedly connected with locking heads 23.
Wherein, the oil injection device 9 is a press-fit type pressure injection oil cup; a sealing ring is arranged between the inner side surface of the adjusting seat 4 and the outer side surface of the supporting seat 3; the top cover 11 is a sealing top cover; the lower bearing 6 is a thrust ball bearing; the upper bearing 7 is a thrust ball bearing; inner hexagonal holes are formed in the outer sides of the adjusting heads 22; and inner hexagonal holes are formed in the outer sides of the locking heads 23.
The using state of the invention is as follows: the invention has the advantages of reasonable and simple structure, low production cost and convenient installation, the lower bearing 6 arranged therein can meet the requirement of larger bearing pressure of the crane, and can meet the requirement of larger torque by matching with the upper bearing 7, thereby ensuring the stability and reliability during rotation, the arranged oil injection device 9 can inject oil to the bearing in the rotary seat 14, thereby reducing resistance and improving the effect of long-time use, in addition, the locking head 23 can be loosened by an inner hexagonal wrench, the locking block 28 can be driven to be separated from the locking cylinder 29, thereby being convenient for adjusting the height of the adjusting seat 4, when in specific adjustment, firstly, the adjusting head 22 is rotated by the inner hexagonal wrench, the rotation of the adjusting head 22 drives the side gear 17 to rotate by the screw rod one 18, the rotation of the side gear 17 drives the connecting gear 16 to rotate, and the rotation of the connecting gear 16 drives all the screw rods one 18 to rotate by the corresponding side gear 17, thereby can make the radial movement of sloping block 19 adjust the height of adjusting seat 4 to there is clearance influence reliability and stability of use about avoiding the bearing, also brought very big facility for the later maintenance regulation in addition.
In the case of the control mode of the invention, which is controlled by manually activating and deactivating the switch, the wiring diagram of the power element and the provision of the power source are known in the art, and the invention is primarily intended to protect the mechanical device, so that the control mode and wiring arrangement will not be explained in detail in the present invention.
In the description of the invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "two ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the invention.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the terms in the invention is understood by those skilled in the art according to specific situations.
While there have been shown and described what are at present considered the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
1. A port crane boom slewing device comprising: adjust seat (4), lower bearing (6), upper bearing (7), connecting seat (12) and gyration seat (14), its characterized in that: the oil injection device is characterized by also comprising a base (1), a fixing hole (2), a supporting seat (3), a sealing ring (5), a side bearing (8), an oil injection device (9), an oil injection hole (10), a top cover (11), a fixing screw (13) and a mounting hole (15);
a plurality of fixing holes (2) are uniformly formed in the periphery of the base (1);
the lower side of the supporting seat (3) is fixedly connected in the center of the upper side of the base (1), and the center of the outer part of the supporting seat (3) is vertically and movably connected with an adjusting seat (4);
the connecting seat (12) is fixedly connected to the center of the upper side of the supporting seat (3) through a plurality of fixing screws (13);
an inner boss at the lower side of the rotary seat (14) is positioned between the bottom surface of the connecting seat (12) and the top surface of the adjusting seat (4), and a sealing ring (5) is arranged between the edge of the bottom surface of the rotary seat (14) and the edge of the top surface of the adjusting seat (4);
the lower bearing (6) is arranged between the bottom surface of the rotary seat (14) and the top surface of the adjusting seat (4);
the upper bearing (7) is arranged between the top surface of the inner boss at the lower side of the rotary seat (14) and the bottom surface of the connecting seat (12);
the side bearing (8) is arranged between the side surface of the connecting seat (12) and the inner side surface of the rotary seat (14);
the oil filling hole (10) is arranged in the left upper side of the rotary seat (14), an outlet at the inner side of the oil filling hole (10) is communicated with the inner upper side of the rotary seat (14), and an inlet at the outer side of the oil filling hole (10) is provided with an oil filling device (9);
the top cover (11) is fixedly connected in an opening at the upper side of the rotary seat (14);
the mounting holes (15) are a plurality of, and the mounting holes (15) are uniformly arranged in the edges on the periphery of the upper side of the adjusting seat (4).
2. The boom slewing device of the harbor crane as claimed in claim 1, wherein: the locking device also comprises a connecting gear (16), a side gear (17), a first screw (18), an inclined block (19), a lower inclined surface (20), an upper inclined surface (21), an adjusting head (22), a locking head (23), a guide groove (24), a second screw (25), an internal thread (26), a guide hole (27), a locking block (28), a locking cylinder (29) and a bottom cover body (30);
the connecting gear (16) is movably connected to the upper side of the inner part below the supporting seat (3);
the guide grooves (24) are arranged in the edge of the upper side of the base (1) in a circular shape, and the guide grooves (24) are movably connected with inclined blocks (19);
the top surfaces of the inclined blocks (19) are respectively provided with an upper inclined surface (21), and the central threaded holes of the inclined blocks (19) are respectively and movably connected with a first screw rod (18);
the inner side of the first screw rod (18) is movably connected into corresponding radial holes on the periphery of the lower side of the supporting seat (3), the outer side ends of the first screw rod (18) are fixedly connected with adjusting heads (22), the inner side ends of the first screw rod (18) are fixedly connected with side gears (17), and the side gears (17) are connected with connecting gears (16);
the number of the lower inclined planes (20) is multiple, the lower inclined planes (20) are respectively connected with corresponding upper inclined planes (21), and the upper inclined planes (21) are all arranged at corresponding positions at the bottom of the adjusting seat (4);
the guide holes (27) are a plurality of, the guide holes (27) are respectively and uniformly arranged in the periphery of the inner part of the lower side of the support seat (3), and internal threads (26) are arranged in the outer sides of the guide holes (27);
the bottom cover body (30) is fixedly connected in an opening at the lower side of the supporting seat (3), a locking column body (29) is movably connected in the bottom cover body (30), and the center of the locking column body (29) is fixedly connected on a lower shaft of the connecting gear (16);
the locking blocks (28) are a plurality of, the locking blocks (28) are respectively movably connected in the corresponding guide holes (27), and the inner sides of the locking blocks (28) are respectively connected with the outer circular surface of the locking cylinder (29) through corresponding through holes on the periphery of the bottom cover body (30);
the screw rod two (25) are a plurality of, the inboard external screw thread of screw rod two (25) is swing joint respectively in corresponding internal thread (26), the inboard terminal surface of screw rod two (25) links to each other with latch segment (28) lateral surface that corresponds respectively, swing joint respectively in the radial hole that corresponds all around base (1) upside in the screw rod two (25) outside, the equal fixedly connected with locking head (23) of screw rod two (25) outside tip.
3. The boom slewing device of the harbor crane as claimed in claim 1, wherein: the oil injection device (9) is a press-fit type pressure injection oil cup.
4. The boom slewing device of the harbor crane as claimed in claim 1, wherein: and a sealing ring is arranged between the inner side surface of the adjusting seat (4) and the outer side surface of the supporting seat (3).
5. The boom slewing device of the harbor crane as claimed in claim 1, wherein: the top cover (11) is a sealing top cover.
6. The boom slewing device of the harbor crane as claimed in claim 1, wherein: the lower bearing (6) is a thrust ball bearing.
7. The boom slewing device of the harbor crane as claimed in claim 1, wherein: the upper bearing (7) is a thrust ball bearing.
8. The boom slewing device of the harbor crane as claimed in claim 2, wherein: and inner hexagonal holes are formed in the outer sides of the adjusting heads (22).
9. The boom slewing device of the harbor crane as claimed in claim 2, wherein: and inner hexagonal holes are formed in the outer sides of the locking heads (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911291351.1A CN110980561B (en) | 2019-12-16 | 2019-12-16 | Harbour crane jib loading boom slewer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911291351.1A CN110980561B (en) | 2019-12-16 | 2019-12-16 | Harbour crane jib loading boom slewer |
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| Publication Number | Publication Date |
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| CN110980561A CN110980561A (en) | 2020-04-10 |
| CN110980561B true CN110980561B (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911291351.1A Active CN110980561B (en) | 2019-12-16 | 2019-12-16 | Harbour crane jib loading boom slewer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2357470A1 (en) * | 1973-11-17 | 1975-05-22 | Kloeckner Humboldt Deutz Ag | DEVICE FOR ADJUSTING LOCAL RESCUE DEVICES, E.G. SWIVEL LADDERS, IN A PLATFORM ERECTING LEVEL |
| US3923407A (en) * | 1974-02-06 | 1975-12-02 | Fmc Corp | Mechanism for connecting and disconnecting crane sections |
| CN201096182Y (en) * | 2007-07-19 | 2008-08-06 | 河北省永年县精良实业有限公司 | Clearance adjustable type split rotation gear plate |
| CN202440250U (en) * | 2012-02-14 | 2012-09-19 | 齐齐哈尔轨道交通装备有限责任公司 | Support guiding device and crane suspension arm |
| CN102937139A (en) * | 2012-11-14 | 2013-02-20 | 长沙中联消防机械有限公司 | Pivoting support, boom system and elevating fire truck |
-
2019
- 2019-12-16 CN CN201911291351.1A patent/CN110980561B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2357470A1 (en) * | 1973-11-17 | 1975-05-22 | Kloeckner Humboldt Deutz Ag | DEVICE FOR ADJUSTING LOCAL RESCUE DEVICES, E.G. SWIVEL LADDERS, IN A PLATFORM ERECTING LEVEL |
| US3923407A (en) * | 1974-02-06 | 1975-12-02 | Fmc Corp | Mechanism for connecting and disconnecting crane sections |
| CN201096182Y (en) * | 2007-07-19 | 2008-08-06 | 河北省永年县精良实业有限公司 | Clearance adjustable type split rotation gear plate |
| CN202440250U (en) * | 2012-02-14 | 2012-09-19 | 齐齐哈尔轨道交通装备有限责任公司 | Support guiding device and crane suspension arm |
| CN102937139A (en) * | 2012-11-14 | 2013-02-20 | 长沙中联消防机械有限公司 | Pivoting support, boom system and elevating fire truck |
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|---|---|
| CN110980561A (en) | 2020-04-10 |
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