CN107697824A - A kind of elevator receives hook active safety protection system and crane - Google Patents
A kind of elevator receives hook active safety protection system and crane Download PDFInfo
- Publication number
- CN107697824A CN107697824A CN201711095246.1A CN201711095246A CN107697824A CN 107697824 A CN107697824 A CN 107697824A CN 201711095246 A CN201711095246 A CN 201711095246A CN 107697824 A CN107697824 A CN 107697824A
- Authority
- CN
- China
- Prior art keywords
- control valve
- hydraulic fluid
- fluid port
- limit switch
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 56
- 239000000725 suspension Substances 0.000 claims abstract description 44
- 239000003921 oil Substances 0.000 claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- B66C23/88—Safety gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/42—Control devices non-automatic
- B66D1/44—Control devices non-automatic pneumatic of hydraulic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
- B66D1/56—Adaptations of limit switches
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The present invention discloses a kind of elevator and receives hook active safety protection system, and the first hydraulic fluid port and the second hydraulic fluid port of reversal valve are connected to rolling control oil circuit；Also include the limit switch being arranged on telescopic arm arm head, limit switch signal is connected to control valve, for changing the conducting direction of control valve；The upper hydraulic fluid port of control valve is connected to the second hydraulic fluid port of reversal valve, and the lower hydraulic fluid port of control valve is connected to the reseting cavity of reversal valve；Limit switch be pressurized triggering when to control valve send control signal, control valve is moved to working position, turn on the upper hydraulic fluid port of control valve with lower hydraulic fluid port during in working position, hydraulic oil makes reversal valve be returned to initialization position into reseting cavity.When suspension hook triggers limit switch, the reseting cavity of a part of pressure oil pilot operated directional control valve is made reversal valve be returned to initial position by control valve, and the uphill process of hoist engine stops, and the arm head for avoiding suspension hook and mechanical arm bumps against.The present invention also provides a kind of crane that hook active safety protection system is received comprising above-mentioned elevator.
Description
Technical field
The present invention relates to crane technical field, further relates to a kind of elevator and receives hook active safety protection system.This
Outside, the invention further relates to a kind of crane.
Background technology
The hoisting operation of straight-arm type lorry-mounted crane is mainly to make steel wire rope wound on it by the rolling of winching barrel
Raising and the decentralization of suspension hook are driven, in motion, suspension hook is in free suspension state to straight-arm type lorry-mounted crane, due to track
Out-of-flatness easily causes suspension hook large-amplitude sloshing, aggravates rocking for telescopic jib and vehicle, drives potential safety hazard, and elevator steel wire holds
It is easy to wear.
Straight-arm type lorry-mounted crane passes through elevator steel wire to prevent from suspension hook from rocking being substantially directly tightening up suspension hook at present
Rope tension makes suspension hook be adjacent to arm head.As shown in figure 1, the structure chart tightened up for suspension hook in the prior art, passes through steel wire rope 03
Pulling force makes suspension hook 01 be sticked together with arm head 02, but operator needs the moment to pay attention to suspension hook 01 and arm head 02 during receipts hook
Distance, if if excessive suspension hook do not tighten up and fall flat, damage suspension hook if the steel wire rope pulleying if too small
01st, arm head 02 and steel wire rope, it is rigid contact between suspension hook 01 and arm head 02, manipulation will cause between suspension hook and arm head accidentally
Contact surface gross distortion even steel wire rope snaps.
Such a control mode fully relies on the experience of operator to judge, fitting easily occurs and is asked apart from inappropriate
How topic, therefore, for those skilled in the art, accurately and effectively make suspension hook be in suitable position, is to need at present
Technical problems to be solved.
The content of the invention
The present invention provides a kind of elevator and receives hook active safety protection system, and suspension hook can be made to be in suitable position exactly
Put, avoid suspension hook from being damaged, concrete scheme is as follows：
A kind of elevator receives hook active safety protection system, including rolling control oil circuit and reversal valve, and the of the reversal valve
One hydraulic fluid port and the second hydraulic fluid port are connected to the rolling control oil circuit to control fluid to flow to, in addition to are arranged at Telescopic boom
Limit switch on head, the limit switch can be contacted and triggered with suspension hook；The limit switch signal is connected to control valve,
For changing the conducting direction of the control valve；The upper hydraulic fluid port of the control valve is connected to the second hydraulic fluid port of the reversal valve, institute
The lower hydraulic fluid port for stating control valve is connected to the reseting cavity of the reversal valve；The limit switch is pressurized when triggering and sent out to the control valve
Control signal is sent, the control valve is moved to working position, the upper hydraulic fluid port of the control valve is turned on lower hydraulic fluid port, hydraulic oil enters
Entering the reseting cavity makes the reversal valve be returned to initialization position.
Alternatively, the limit switch is connected by wire harness with the control valve signal, and the wire harness is by being coiled in volume
On line device, the winder is coiled the wire harness by back-moving spring, makes the extension elongation of the wire harness and stretching for telescopic arm
Contracting length keeps matching.
Alternatively, the control valve is two-position three way magnetic valve, and left position connects the upper hydraulic fluid port of the control valve and lower hydraulic fluid port
Logical, right position connects the lower hydraulic fluid port of the control valve with oil return box.
Alternatively, the top of the suspension hook sets buffer unit, and the buffer unit includes bottom plate and panel, the bottom plate
The upper overcoat that tubular is set, set on the panel and be inserted into the overcoat and the inner sleeve being slidably matched therewith；The bottom plate
Gag lever post is set between the panel, is set with back-moving spring outside the gag lever post, the both ends of the back-moving spring are press respectively against
On the bottom plate and the panel.
Alternatively, the gag lever post includes screw rod and nut；The gag lever post is arranged at the overcoat and the inner sleeve shape
Into cavity in.
Alternatively, the top of the panel sets collision block, for being contacted with the limit switch.
The present invention also provides a kind of crane, including the elevator receipts hook active safety protection system described in any of the above-described.
The invention provides a kind of elevator to receive hook active safety protection system, including rolling control oil circuit and control elevator control
Liquefaction road binders liquid stream to reversal valve, the first hydraulic fluid port and the second hydraulic fluid port of reversal valve are connected to rolling control oil circuit to control
Fluid flows to, and reversal valve changes the rotation direction of hoist engine by changing the flow direction of fluid；Also include being arranged at telescopic arm arm head
On limit switch, limit switch can contact with suspension hook, trigger limit switch during contact；Limit switch signal is connected to control
Valve, for changing the conducting direction of control valve；The upper hydraulic fluid port of control valve is connected to the second hydraulic fluid port of reversal valve, the lower oil of control valve
Mouth is connected to the reseting cavity of reversal valve；Limit switch is pressurized when triggering and sends control signal to control valve, moves to control valve
Working position, the upper hydraulic fluid port of control valve is turned on lower hydraulic fluid port during in working position, hydraulic oil, which enters reseting cavity, replys reversal valve
To initialization position.
When needing to pack up on suspension hook, rolling control oil circuit is controlled by reversal valve, so that hoist engine rises, hoist engine rises
When encountering limit switch, limit switch to control valve send control signal, control valve is moved to working position, by upper hydraulic fluid port with
Lower hydraulic fluid port conducting, because the second hydraulic fluid port of upper hydraulic fluid port and reversal valve connects, enter from the hydraulic oil of the second hydraulic fluid port outflow in reseting cavity,
Acted on by the hydraulic oil in reseting cavity and reversal valve is returned to initial position, stopped the uphill process of hoist engine, avoid
The arm head of suspension hook and mechanical arm bumps against.
The present invention also provides a kind of crane that hook active safety protection system is received comprising above-mentioned elevator, and identical can be achieved
Technique effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structure chart that suspension hook is tightened up in the prior art；
Fig. 2 is that elevator provided by the invention receives the asphalt principle figure that hook active safety protects system；
Fig. 3 is that elevator provided by the invention receives the structure drawing of device that hook active safety protects system；
Fig. 4 is the sectional structure chart of buffer unit.
Figure includes：
Arm head 1, limit switch 2, wire harness 21, winder 22, suspension hook 3, control valve 4, oil return box 41, rolling control oil circuit 5,
Reversal valve 6, reseting cavity 61, buffer unit 7, bottom plate 71, overcoat 72, panel 73, inner sleeve 74, gag lever post 75, collision block 76.
Embodiment
The core of the present invention is that providing a kind of elevator receives hook active safety protection system, can be in suspension hook exactly
Suitable position, avoids suspension hook from being damaged.
In order that those skilled in the art more fully understands technical scheme, below in conjunction with accompanying drawing and specifically
Embodiment, hook active safety protection system is received to the elevator of the present invention and explanation is described in detail in crane.
As shown in Fig. 2 the asphalt principle figure of hook active safety protection system is received for elevator provided by the invention；The system bag
Include rolling control oil circuit 5 and reversal valve 6, the first hydraulic fluid port and the second hydraulic fluid port of reversal valve 6 be connected to rolling control oil circuit 5 with
Fluid flow direction is controlled, the first hydraulic fluid port represents that the second hydraulic fluid port is represented with B with A in Fig. 2；Fig. 3 is that elevator provided by the invention receives hook master
The structure drawing of device of dynamic safety system；The system also includes the limit switch 2 being arranged on telescopic arm arm head 1, spacing to open
Close 2 to contact and trigger with suspension hook 3, contacted when suspension hook 3 reclaims upwards, reaches predeterminated position with limit switch 2, triggering limit
Bit switch 2；The signal of limit switch 2 is connected to control valve 4, for changing the conducting direction of control valve 4, namely passes through suspension hook 3
Position changes the working condition of control valve 4；The upper hydraulic fluid port P of control valve 4 is connected to the second hydraulic fluid port B of reversal valve 6, control valve 4
Lower hydraulic fluid port C is connected to the reseting cavity 61 of reversal valve 6, spring is provided with reseting cavity 61, when pressure oil enters fashionable reset；It is spacing to open
Close 2 be pressurized triggering when to control valve 4 send control signal, control valve 4 is moved to working position, by the upper hydraulic fluid port P of control valve 4 with
Lower hydraulic fluid port C conductings, hydraulic oil, which enters reseting cavity 61, makes reversal valve 6 be returned to initialization position.
Reversal valve 6 for control elevator withdrawing rope controls, by manipulate reversal valve 6 A mouths or the oil-feed of B mouths to elevator control
Liquefaction road 5 is realized, if A mouth oil-feeds suspension hook is transferred, if B mouth oil-feeds suspension hook rises.Control valve 4 is used for the B mouth pressures for controlling reversal valve 6
Also answering for reversal valve 6 is entered while power oil is directly entered rolling control oil circuit 5 or enters rolling control oil circuit 5 by it
Position chamber 61, if feed pressure oil in reseting cavity 61, makes reversal valve 6 be returned to initial position, no longer to rolling control by pressure
The fuel feeding of oil circuit 5, suspension hook do not continue to rise.
Specifically, limit switch 2 is connected by wire harness 21 with the signal of control valve 4 in the present invention, and wire harness 21 is by being coiled in
On winder 22, winder 22 is coiled wire harness 21 by back-moving spring, and back-moving spring makes wire harness 21 have becoming for coiling contraction
Gesture, the winding active force of back-moving spring is resisted when telescopic arm extends, extends wire harness 21, when telescopic arm is withdrawn, wire harness 21
Back-moving spring back stretch effect under be wound on winder 22, make the extension elongation of wire harness 21 and the flexible length of telescopic arm
Degree keeps matching.In addition to transmitting signal by wire harness 21, it can also use and the control mode such as be wirelessly transferred.
Specifically, control valve 4 is two position, three-way electromagnetic change valve, and left position connects the upper hydraulic fluid port of control valve 4 with lower hydraulic fluid port,
Right position connects the lower hydraulic fluid port of control valve 4 with oil return box 41.When 4 dead electricity of control valve, the B mouth pressure oils of reversal valve 6 directly enter
Enter rolling control oil circuit 5, the fluid of the reseting cavity 61 of reversal valve 6 flows into right position oil return box 41 by control valve 4, when control valve 4 obtains
When electric, the reseting cavity 61 of reversal valve 6 is also entered while the B mouths pressure oil of reversal valve 6 enters rolling control oil circuit 5, will be forced
The control crank of reversal valve 6 resets.
The course of work of the system is as follows：The handle of reversal valve 6 is manipulated after the completion of operation to be lifted makes its left position work, i.e. P
To B, A to T, the P mouths of the B mouths pressure oil of reversal valve 6 to solenoid directional control valve, now solenoid directional control valve dead electricity and right position works, its
In a road binders be directly entered rolling control oil circuit 5, drive its rollers roll and by hoisting rope pull-up suspension hook, in addition all the way
Oil is ended by solenoid directional control valve；With packing up for suspension hook, the panel 73 of buffer unit 7 contacts arm head 1, compresses lift hook buffering device
Back-moving spring inside 7, when the back-moving spring inside lift hook buffering device 7 continues that limit switch 2 can be triggered by compression,
The conducting of limit switch 2 sends electric signal makes its left position work to control valve 4, and now, the B mouth pressure oils of reversal valve 6 connect all the way
Rolling control oil circuit 5, another way connect the reseting cavity 61 of reversal valve 6, because the hydraulic coupling of reseting cavity 61 is much larger than operator's
Manually handle power, forcing 6 control cranks of commutation to reset makes its middle position work, and rolling control oil circuit 5 stops receiving hook, and this process is completed
Receive the cushioning effect of hook processes and actively judge to receive the protective effect that hook is completed and stops receiving hook.
Another effect of the device is to prevent artificial maloperation and damage suspension hook 3, arm head 1 and steel wire rope, its work
Principle is：Suspension hook 3 by tightening state prepare put hook operation when, operator may maloperation reversal valve 6 handle orientations and
Suspension hook 3 is set to continue to tighten up and be damaged, because now suspension hook 3 is constantly in tightening state and is in limit switch 2 and is triggered
And the state turned on, i.e. control valve 4 obtain electric left position work, the B mouths pressure oil of the moment reversal valve 6 of error operations passes through control valve 4
Reseting cavity 61 full of reversal valve 6, forces control crank to reset, and control crank now can only transfer directional control towards suspension hook 3,
Vehicle is damaged so as to avoid the error operations because of operator.
In any of the above-described technical scheme and its on the basis of being mutually combined, further to slow down impact, the top of suspension hook 3 is set
Buffer unit 7 is put, as shown in figure 4, the sectional structure chart for buffer unit；Buffer unit 7 includes bottom plate 71 and panel 73, both
It is arranged in parallel；The overcoat 72 of tubular is set on bottom plate 71, inner sleeve 74 is set on panel 73, inner sleeve 74 is inserted into overcoat 72
And it is spacing therewith be slidably matched, bottom plate 71 is only located remotely from each other with panel 73 on parallel direction or close；Bottom plate 71 and face
Gag lever post 75 is set between plate 73, maximum spacing between the two is limited by gag lever post 75, is set with outside gag lever post 75 and resets bullet
Spring, the both ends of back-moving spring are press respectively against on bottom plate 71 and panel 73, in the case where bottom plate 71 and panel 73 are not acted on by external force, both
The maximum spaced position limited by gag lever post 75 is maintained at by the elastic force of back-moving spring；And when panel 73 and the limit switch of top
During 2 contact-impact, cushioning effect is played by the elastic force of back-moving spring, suspension hook is reduced and is hit the probability of damage.
Specifically, gag lever post 75 includes screw rod and nut, and gag lever post 75 is movable cooperation with bottom plate 71 and panel 73；Limit
In the cavity that position bar 75 is arranged at overcoat 72 and inner sleeve 74 is formed, the integrated level of device is higher.
In addition, setting collision block 76 at the top of panel 73, for being contacted with limit switch 2, collision block 76 can use flexible material
Material is made, further to slow down impact.
The present invention also provides a kind of crane, including above-mentioned elevator receives hook active safety protection system, can reach same
Technique effect.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle, it can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, this hair
It is bright to be not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase
Consistent most wide scope.
Claims (7)
1. a kind of elevator receives hook active safety protection system, including rolling control oil circuit (5) and reversal valve (6), the reversal valve
(6) the first hydraulic fluid port and the second hydraulic fluid port is connected to the rolling control oil circuit (5) to control fluid to flow to, and its feature exists
In, in addition to the limit switch (2) being arranged on telescopic arm arm head (1), the limit switch (2) can contact with suspension hook (3)
And trigger；Limit switch (2) signal is connected to control valve (4), for changing the conducting direction of the control valve (4)；Institute
The upper hydraulic fluid port for stating control valve (4) is connected to the second hydraulic fluid port of the reversal valve (6), and the lower hydraulic fluid port of the control valve (4) is connected to
The reseting cavity (61) of the reversal valve (6)；The limit switch (2) is pressurized when triggering and sends control letter to the control valve (4)
Number, the control valve (4) is moved to working position, the upper hydraulic fluid port of the control valve (4) is turned on lower hydraulic fluid port, hydraulic oil enters
The reseting cavity (61) makes the reversal valve (6) be returned to initialization position.
2. elevator according to claim 1 receives hook active safety protection system, it is characterised in that the limit switch (2)
It is connected by wire harness (21) with the control valve (4) signal, the wire harness (21) is by being coiled on winder (22), the volume
Line device (22) is coiled the wire harness (21) by back-moving spring, makes the extension elongation of the wire harness (21) and stretching for telescopic arm
Length keeps matching.
3. elevator according to claim 1 receives hook active safety protection system, it is characterised in that the control valve (4) is
Two-position three way magnetic valve, left position connect the upper hydraulic fluid port of the control valve (4) with lower hydraulic fluid port, and right position is by the control valve (4)
Lower hydraulic fluid port connects with oil return box (41).
4. the elevator according to any one of claims 1 to 3 receives hook active safety protection system, it is characterised in that described to hang
The top of hook (3) sets buffer unit (7), and the buffer unit (7) includes bottom plate (71) and panel (73), the bottom plate (71)
The upper overcoat (72) that tubular is set, set on the panel (73) and be inserted into the overcoat (72) and be slidably matched therewith interior
Cover (74)；Gag lever post (75) is set between the bottom plate (71) and the panel (73), and the gag lever post (75) is set with reset outside
Spring, the both ends of the back-moving spring are press respectively against on the bottom plate (71) and the panel (73).
5. elevator according to claim 4 receives hook active safety protection system, it is characterised in that gag lever post (75) bag
Include screw rod and nut；In the cavity that the gag lever post (75) is arranged at the overcoat (72) and the inner sleeve (74) is formed.
6. elevator according to claim 4 receives hook active safety protection system, it is characterised in that the top of the panel (73)
Portion sets collision block (76), for being contacted with the limit switch (2).
7. a kind of crane, it is characterised in that receive the protection of hook active safety including the elevator described in any one of claim 1 to 6
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711095246.1A CN107697824B (en) | 2017-11-08 | 2017-11-08 | Active safety protection system for winch hook and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711095246.1A CN107697824B (en) | 2017-11-08 | 2017-11-08 | Active safety protection system for winch hook and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107697824A true CN107697824A (en) | 2018-02-16 |
| CN107697824B CN107697824B (en) | 2024-01-19 |
Family
ID=61179354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711095246.1A Active CN107697824B (en) | 2017-11-08 | 2017-11-08 | Active safety protection system for winch hook and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107697824B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302183A (en) * | 2000-04-14 | 2001-10-31 | Hitachi Constr Mach Co Ltd | Hydraulic speed controller, hook overwinding prevention device, and interference prevention device |
| CN205241036U (en) * | 2015-12-08 | 2016-05-18 | 宝钢德盛不锈钢有限公司 | A anti -collision buffer device for C type lifting hook |
| CN205687444U (en) * | 2016-06-17 | 2016-11-16 | 三河市新宏昌专用车有限公司 | There is the lorry-mounted crane automatic tightening device of suspension hook overtravel protection function |
| CN207524869U (en) * | 2017-11-08 | 2018-06-22 | 安徽星马专用汽车有限公司 | A kind of elevator receives hook active safety protection system and crane |
-
2017
- 2017-11-08 CN CN201711095246.1A patent/CN107697824B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302183A (en) * | 2000-04-14 | 2001-10-31 | Hitachi Constr Mach Co Ltd | Hydraulic speed controller, hook overwinding prevention device, and interference prevention device |
| CN205241036U (en) * | 2015-12-08 | 2016-05-18 | 宝钢德盛不锈钢有限公司 | A anti -collision buffer device for C type lifting hook |
| CN205687444U (en) * | 2016-06-17 | 2016-11-16 | 三河市新宏昌专用车有限公司 | There is the lorry-mounted crane automatic tightening device of suspension hook overtravel protection function |
| CN207524869U (en) * | 2017-11-08 | 2018-06-22 | 安徽星马专用汽车有限公司 | A kind of elevator receives hook active safety protection system and crane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107697824B (en) | 2024-01-19 |
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