CN109534193A - A kind of tool for crane transit telegram alarm device - Google Patents
A kind of tool for crane transit telegram alarm device Download PDFInfo
- Publication number
- CN109534193A CN109534193A CN201811540527.8A CN201811540527A CN109534193A CN 109534193 A CN109534193 A CN 109534193A CN 201811540527 A CN201811540527 A CN 201811540527A CN 109534193 A CN109534193 A CN 109534193A
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- valve
- fluid port
- hydraulic fluid
- oil
- crane
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Classifications
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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
- B66C23/88—Safety gear
- B66C23/94—Safety gear for limiting slewing movements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a kind of tool for crane transit telegram alarm devices, including hydraulic pump, double linked one-way valve, rotary motor, rotary control valve group, trainstop, and the pressure switch whether alarmed for controlling alarm；The pressure switch is connected on the connection oil circuit of double linked one-way valve and trainstop；When crane is in revolution or free rotary operating condition, double linked one-way valve takes hydraulic oil to flow to trainstop from MP hydraulic fluid port or hydraulic pump, and pressure switch is connected in the hydraulic oil in this connection oil circuit, and then alarm is made to issue alarm.The present invention has pressure, can alarm by the pressure on the oil inlet and oil return road of trainstop, either nominal situation or free rotary, oil inlet and oil return road.
Description
Technical field
The present invention relates to the security alarm technical fields of crane, and in particular to a kind of Novel crane revolution alarm dress
It sets.
Background technique
Currently, the autocrane of large-tonnages may be implemented 360 degree of revolution operations in many in the market, autocrane this
The carrying for being improved to cargo of a little performances plays convenient work well, but the increase of angle of revolution also increases operator
Difficulty, be easy to cause safety accident.Therefore extraneous safety prompt function is particularly important when crane rotation work, is alarmed
Alarm set is essential.
Crane rotation warning device mainly uses three kinds of methods at present: 1, traditional revolution alarm set, i.e., at every
One loudspeaker is installed, operator's manually actuated switch when revolution, loudspeaker alarm plays a warning role on crane.2, for liquid
Autocrane is controlled, pressure switch is added in hydraulic control rotary control system, passes through the output pressure of slewing directional control valve pilot port
Power triggers pressure switch driving buzzer work.3, for automatically controlled autocrane, in automatically controlled rotary control system, lead to
Cross judge electric proportional pressure-reducing valve whether electric work to directly drive buzzer.
First method is although at low cost, but operator is needed to open buzzer switch manually, increases operator's difficulty；The
Three kinds of methods are although at low cost, but under crane free rotary operating condition, since proportional pressure-reducing valve must not be electric, so buzzer is not
Alarm.
The specific implementation of second method in the prior art is as follows:
The first implementation, referring to Fig. 1, pressure switch A1 and pressure switch A2 are individually positioned in oil circuit reversal valve A3's
The side control port a and the side control port b, pressure switch A1 and A2 detect whether corresponding control port has pressure signal, and
According to have no pressure signal to determine whether driving buzzer warning.As the control port a and control port b of oil circuit reversal valve A3
When no pressure oil, pressure switch A1 and A2 no signal, oil circuit reversal valve A3 is in Median Function, and rotary motor A4 is not turned round,
Buzzer is not alarmed；When control port a or control port b are passed through pressure oil, oil circuit reversal valve A3 commutation, rotary motor A4 is returned
Turn, while pressure switch A1 or A2 obtain electric sending electric signal driving buzzer warning.
This prior art at least has the following disadvantages:
1. operator's pushing operation handle free rotary button, free rotary solenoid valve obtain electric, crane does free rotary movement,
Oil circuit reversal valve A3 is in middle position at this time, and guide's hydraulic fluid port (i.e. control port) is not touched without pilot pressure, pressure switch A1 and A2
Hair, buzzer are not alarmed；
2. needing two pressure switches, at high cost, poor reliability because there are two guide's hydraulic fluid ports by oil circuit reversal valve A3.
Second of implementation, referring to fig. 2, pressure switch B1 and pressure switch B2 are individually positioned in oil circuit reversal valve
The pressure of the side control port a and the side control port b of B3, control port a, b is controlled by pressure reducing valve B4 and pressure reducing valve B5, relay
Whether device B1 and B2 detection control port a, b have pressure signal to drive buzzer warning.When pressure reducing valve B4 and B5 is without electric signal,
When the control port a and control port b no pressure oil of oil circuit reversal valve B3, pressure switch B1 and B2 no signal, oil circuit commutation
Valve B3 is in Median Function, and rotary motor B6 is not turned round, and buzzer is not alarmed；When pressure reducing valve B4 and B5 have electric signal, control oil
When mouth a or control port b is passed through pressure oil, oil circuit reversal valve B3 commutation, rotary motor B6 revolution, while relay B1 or B2 are sent out
Electric signal drives buzzer warning out.
This prior art at least has the following disadvantages:
1. crane works under free rotary operating condition, oil circuit reversal valve when the triggering of the pilot control opening of oil circuit reversal valve B3
B3 is in middle position, and electric proportional pressure-reducing valve B4 and B5 does not alarm without control electric signal, buzzer.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of tool for crane transit telegram alarm device is proposed,
It solves in the prior art under free rotary operating condition, the technical issues of buzzer is not alarmed.
In order to solve the above technical problems, the present invention provides a kind of tool for crane transit telegram alarm devices, characterized in that including
Hydraulic pump, double linked one-way valve, rotary motor, rotary control valve group, trainstop, and for controlling whether alarm alarms
Pressure switch；
First hydraulic fluid port of rotary motor is connected to the P hydraulic fluid port of rotary control valve group, and the second hydraulic fluid port of rotary motor and revolution control
The T hydraulic fluid port of valve group is connected to,
The MP hydraulic fluid port of rotary control valve group is connected to the first oil inlet of double linked one-way valve, the second oil inlet of double linked one-way valve with
Hydraulic pump connection, the oil outlet of double linked one-way valve are connected to the hydraulic fluid port of trainstop；
The pressure switch is connected on the connection oil circuit of double linked one-way valve and trainstop；
When crane is in revolution or free rotary operating condition, double linked one-way valve takes hydraulic oil to flow to from MP hydraulic fluid port or hydraulic pump
Trainstop, pressure switch is connected in this hydraulic oil being connected in oil circuit, and then alarm is made to issue alarm.
Further, rotary control valve group includes slewing directional control valve, free rotary control valve, overflow valve and trimmer valve；
In revolution movement, hydraulic oil enters the first hydraulic fluid port or the second hydraulic fluid port of rotary motor after the P hydraulic fluid port of slewing directional control valve,
And then drive rotary motor to the right or left movement, and the oil return of rotary motor commutates after the second hydraulic fluid port or the first hydraulic fluid port through revolution
The T mouth of valve flows back to fuel tank；
In free rotary operating condition, slewing directional control valve Hui Zhongwei, free rotary solenoid valve obtain it is electric, weight involve power effect under,
So that rotary motor side is generated high pressure, until pressure reaches the pressure of overflow valve and opening overflow valve makes trimmer valve commutate, makes back
The two cavity volumes connection for turning motor, realizes free rotary.
Further, pedal reversal valve is equipped on the connection oil circuit of double linked one-way valve and trainstop, it is described foot-operated
Reversal valve is used in revolution manipulation process, and the trainstop is made to carry out emergency braking to the rotary motor.
Further, the hydraulic fluid port of trainstop is also communicated with one-way damper valve, and the hydraulic oil of trainstop is through unidirectional
Orifice valve flows back to fuel tank.
Further, it is additionally provided with solenoid directional control valve on the connection oil circuit between double-connected switching valve and hydraulic pump, with control
The circulation of oil circuit between double-connected switching valve and hydraulic pump.
Further, the slewing directional control valve is hand-operated direction valve, solenoid directional control valve or pilot operated directional control valve.
Further, the slewing directional control valve is three six-way transfer valves.
Further, free rotary solenoid valve is two position four-way solenoid valves or 2/2-way solenoid valve.
Compared with prior art, the beneficial effects obtained by the present invention are as follows being: revolution warning device of the invention makes crane
It either does normal revolution and still does free rotary operating condition, hydraulic oil can all open trainstop, and pressure switch can all touch
Hair, alarm equipment alarm solve the problems, such as that alarm is not alarmed under free rotary operating condition in the prior art.
Detailed description of the invention
Fig. 1 is the oil circuit schematic diagram for turning round warning device technical solution 1 in the prior art；
Fig. 2 is the oil circuit schematic diagram for turning round warning device technical solution 2 in the prior art；
Fig. 3 is the oil circuit schematic diagram of present invention revolution warning device embodiment one；
Fig. 4 is the oil circuit schematic diagram of present invention revolution warning device embodiment two；
Fig. 5 is the oil circuit schematic diagram of present invention revolution warning device embodiment three；
Fig. 6 is the circuit diagram of present invention revolution warning device embodiment three.
Appended drawing reference: in Fig. 1: A1, A2 pressure switch；A3 oil circuit reversal valve；A4 rotary motor；
In Fig. 2: B1, B2 pressure switch；B3 oil circuit reversal valve；B4, B5 pressure reducing valve；B6 rotary motor；
In Fig. 3 and Fig. 4: 10, rotary motor；11, rotary control valve group；12, overflow valve；13, rotary buffering valve；14, it rides and changes
To valve；15, free rotary solenoid valve；16, slewing directional control valve；17, double linked one-way valve；18, rotary motor；19, pressure switch；
20, hydraulic pump；21, solenoid directional control valve；22, one-way damper valve；
In Fig. 5 and Fig. 6: 1, switch is integrated.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
In the description of the invention patent, it should be noted that the terms "include", "comprise" or its any other variant
It is intended to non-exclusive inclusion, in addition to comprising those of listed element, but also may include other being not explicitly listed
Element.
In the description of the invention patent, it should be noted that term " center ", "lower", "left", "right", " is erected at "upper"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the invention patent and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to the invention patent.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the invention patent, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the invention patent.
The relational language being related in the present invention carries out description below:
Autocrane: workplace is unrestricted, can not need trapped orbit under band load or no-load condition and work, and according to
Stable jib-type crane is kept by stress balance；
Rotary motor: for executing revolution manipulation；
Trainstop: when crane is in stop working state, to getting on the bus, turntable carries out locked device；
Rotary control valve group: the hydraulic fluid port of rotary motor is delivered to drive rotary motor to rotate for controlling oil liquid；
Pressure switch: converting pressure into the hydraulic component of electric signal, and client passes through according to itself pressure design needs
Pressure switch is adjusted, realizes in the pressure of a certain setting, exports the function of an electric signal；
Free rotary state: when crane arm pressed when hoisting operation is by layback the free rotary in left handle or right handles by
Turn round, turntable can automatic capturing, go to plane where crane arm center line above weight center of gravity, prevent crane arm by lateral
Power and cause side sway even fracture.
Through the analysis to prior art it is found that on the pressure sensor location of pressure switch, existing both of which be
The pilot port position pressure of multi-way valve, in free rotary, pilot port no pressure causes revolution not alarmed.
A kind of tool for crane transit telegram alarm device of the invention, principle as shown in figure 3, include hydraulic pump, double linked one-way valve,
Rotary motor, rotary control valve group, trainstop, and the pressure switch whether alarmed for controlling alarm；
First hydraulic fluid port of rotary motor is connected to the P hydraulic fluid port of rotary control valve group, and the second hydraulic fluid port of rotary motor and revolution control
The T hydraulic fluid port of valve group is connected to,
The MP hydraulic fluid port of rotary control valve group is connected to the first oil inlet of double linked one-way valve, the second oil inlet of double linked one-way valve with
Hydraulic pump connection, the oil outlet of double linked one-way valve are connected to the hydraulic fluid port of trainstop；
The pressure switch is connected on the connection oil circuit of double linked one-way valve and trainstop；
When crane is in revolution or free rotary operating condition, double linked one-way valve takes hydraulic oil to flow to from MP hydraulic fluid port or hydraulic pump
Trainstop, pressure switch is connected in this hydraulic oil being connected in oil circuit, and then alarm is made to issue alarm；
In other operating conditions, without hydraulic oil on the connection oil circuit of double linked one-way valve and trainstop, pressure switch is disconnected,
Alarm is not alarmed.
Revolution warning device of the invention makes crane either do normal revolution and still does free rotary operating condition, hydraulic
Oil can all open trainstop, and pressure switch can all trigger, alarm equipment alarm, solve free skating in the prior art and change a job
The problem of alarm is not alarmed under condition.
Embodiment 1
The embodiment of the present invention is a kind of tool for crane transit telegram alarm device, and principle is as shown in figure 3, include hydraulic pump 20, duplex list
To valve 17, rotary motor 10, rotary control valve group 11, trainstop 18, and the pressure whether alarmed for controlling alarm
Power relay 19；
First hydraulic fluid port of rotary motor 10 is connected to the P hydraulic fluid port of rotary control valve group 11, the second hydraulic fluid port of rotary motor 10 with return
Turn the T hydraulic fluid port connection of control valve group 11,
The MP hydraulic fluid port of rotary control valve group 11 is connected to the first oil inlet of double linked one-way valve 17, double linked one-way valve 17 second into
Hydraulic fluid port is connected to hydraulic pump 20, and the oil outlet of double linked one-way valve 17 is connected to the hydraulic fluid port of trainstop 18；
The pressure switch 19 is connected on the connection oil circuit of double linked one-way valve 17 and trainstop 18；
Rotary control valve group 11 includes slewing directional control valve 16, free rotary control valve 15, overflow valve 12 and trimmer valve 13.It is returning
Rotation is when making, first guide's hydraulic fluid port a of rotary control valve group 11 (or second guide's hydraulic fluid port b) oil inlet, push slewing directional control valve 16
Spool commutation, hydraulic oil after the P hydraulic fluid port of slewing directional control valve 16 enter rotary motor 10 the first hydraulic fluid port (left side in Fig. 3
For the first hydraulic fluid port) or the second hydraulic fluid port, and then (or left) movement to the right of rotary motor 10 is driven, and the oil return of rotary motor 10 is through the
Two hydraulic fluid ports (or first hydraulic fluid port) flow back to fuel tank by the T mouth of slewing directional control valve 16.
In revolution stopped process i.e. in free rotary operating condition, free rotary solenoid valve 15 obtains electric, slewing directional control valve 16
Spool gradually Hui Zhongwei is acted on due to spring, since hoist object has the tendency that continuing movement under effect of inertia, led in weight
It pulls under power effect, rotary motor side is made to generate high pressure, until pressure reaches the pressure of overflow valve 12 and opening overflow valve makes to delay
The commutation of valve 13 is rushed, two cavity volumes of rotary motor 10 are connected to, realizes free rotary.
Until pressure reach the pressure of overflow valve 12 and open overflow valve make trimmer valve 13 commutate, realize revolution oil inlet and oil return pass through
It removes heat by catharsis lotus.After pressure reduction, overflow valve 12 resets trimmer valve 13, and under hoist object effect of inertia, return oil pressure again will be fast
Run-up is stood to overflow valve 12 is opened, and realizes drain charge buffering.
Slewing directional control valve 16 is hand-operated direction valve, solenoid directional control valve or pilot operated directional control valve.Slewing directional control valve 16 is three
Six-way transfer valve.Free rotary solenoid valve 15 is two position four-way solenoid valves or 2/2-way solenoid valve.
In this embodiment, alarm uses buzzer in the prior art, in double-connected switching valve 17 and trainstop
Pedal reversal valve 14 is additionally provided on connection oil circuit between 18, the pedal reversal valve 14 is used in revolution manipulation process, makes
Trainstop carries out emergency braking to the rotary motor.Pressure switch 19 is located at pedal reversal valve 14 in this embodiment
Top.
The hydraulic fluid port of trainstop 18 is also communicated with one-way damper valve 22, and the hydraulic oil of trainstop is through one-way damper valve
Flow back to fuel tank.It is additionally provided with solenoid directional control valve 21 on connection oil circuit between double-connected switching valve 17 and hydraulic pump 20, it is double to control
Join the circulation of oil circuit between reversal valve 17 and hydraulic pump 20.
The present invention turns round warning device specific work process are as follows:
1. slewing directional control valve 16 is in Median Function at this time when swing mechanism does not carry out any movement, P mouthfuls and T mouthfuls are communicated,
Oil liquid position off-load directly from slewing directional control valve 16, rotary motor 10 do not work, at this time 18 oil inlet and oil return road nothing of trainstop
Pressure, pressure switch 19 do not trigger, and buzzer is not alarmed；
2. slewing directional control valve 16 commutates, and crane does rotary motion when pulling control crank.Pressure oil two-way at this time: all the way
It is entered in rotary motor 10 through slewing directional control valve 16, driving swing mechanism works；Another way flows through duplex list through MP mouthfuls
Enter trainstop 18 to valve 17 and pedal reversal valve 14, trainstop 18 is opened, and pressure switch 19 triggers, buzzer
Alarm, crane rotation.
3. pressing the switch of free rotary solenoid valve 15 when load is in layback state, obtaining free rotary solenoid valve 15
Electricity, swing mechanism automatic alignment.Hydraulic pump (hoist engine hydraulic oil) passes through solenoid directional control valve 21, double linked one-way valve 17, foot at this time
It steps on reversal valve 14 and enters trainstop 18, trainstop 18 is opened, and pressure switch 19 triggers, buzzer warning, lifting
Machine does free rotary movement.
4. the pressure oil of trainstop 18 flows automatically by one-way damper valve 22 after crane finishes revolution movement
Oil return box, 18 oil inlet and oil return road pressure of trainstop disappear, and buzzer warning automatically terminates.
Therefore, the present invention proposes pressure, either nominal situation or freedom on the oil inlet and oil return road of trainstop 18
It trackslips, there is pressure in oil inlet and oil return road, can all alarm.
The invention has the following advantages that
1. autocrane either does normal revolution and still does free rotary operating condition, pressure oil can all open trainstop,
Pressure switch can all trigger, buzzer warning, and thus thoroughly solve that buzzer under free rotary operating condition do not alarm asks
Topic；
2. because brake oil inlet and oil return mouth only one, only need a pressure switch, at low cost, high reliablity；
3. buzzer under two kinds of operating conditions (revolution/free rotary) all can automatic alarm and releasing, high degree of automation, operation
It is convenient.
Embodiment 2
Another embodiment of the present invention is a kind of tool for crane transit telegram alarm device, and principle is as shown in figure 4, with the embodiment of Fig. 3
Unlike, pressure switch 19 is located at 14 lower section of pedal reversal valve in this embodiment.Normal revolution is either done still to do
Free rotary operating condition, pressure oil can all open trainstop, and pressure switch can all trigger, and buzzer warning is thus thorough
Bottom solves the problems, such as that buzzer is not alarmed under free rotary operating condition.
Fig. 5 is crane hydraulic control, using highly integrated control strategy, rotary braking is switched and turned round buzzer switch
It is integrated to be opened trainstop by lower switch integrated 1 for switch integrated 1 and triggered revolution buzzer simultaneously.
Fig. 6 is automatically controlled crane, the same crane hydraulic control of implementation.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications, these improvements and modifications can also be made
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of tool for crane transit telegram alarm device, characterized in that including hydraulic pump, double linked one-way valve, rotary motor, revolution control
Valve group processed, trainstop, and the pressure switch whether alarmed for controlling alarm；
First hydraulic fluid port of rotary motor is connected to the P hydraulic fluid port of rotary control valve group, and the second hydraulic fluid port of rotary motor and revolution control
The T hydraulic fluid port of valve group is connected to,
The MP hydraulic fluid port of rotary control valve group is connected to the first oil inlet of double linked one-way valve, the second oil inlet of double linked one-way valve with
Hydraulic pump connection, the oil outlet of double linked one-way valve are connected to the hydraulic fluid port of trainstop；
The pressure switch is connected on the connection oil circuit of double linked one-way valve and trainstop；
When crane is in revolution or free rotary operating condition, double linked one-way valve takes hydraulic oil to flow to from MP hydraulic fluid port or hydraulic pump
Trainstop, pressure switch is connected in this hydraulic oil being connected in oil circuit, and then alarm is made to issue alarm.
2. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that rotary control valve group includes back
Turn reversal valve, free rotary control valve, overflow valve and trimmer valve；
In revolution movement, hydraulic oil enters the first hydraulic fluid port or the second hydraulic fluid port of rotary motor after the P hydraulic fluid port of slewing directional control valve,
And then drive rotary motor to the right or left movement, and the oil return of rotary motor commutates after the second hydraulic fluid port or the first hydraulic fluid port through revolution
The T mouth of valve flows back to fuel tank；
In free rotary operating condition, slewing directional control valve Hui Zhongwei, free rotary solenoid valve obtain it is electric, weight involve power effect under,
So that rotary motor side is generated high pressure, until pressure reaches the pressure of overflow valve and opening overflow valve makes trimmer valve commutate, makes back
The two cavity volumes connection for turning motor, realizes free rotary.
3. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that in double linked one-way valve and revolution
The connection oil circuit of brake is equipped with pedal reversal valve, and the pedal reversal valve is used in revolution manipulation process, makes described return
Turn brake and emergency braking is carried out to the rotary motor.
4. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that the hydraulic fluid port of trainstop is also
It is communicated with one-way damper valve, the hydraulic oil of trainstop flows back to fuel tank through one-way damper valve.
5. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that double-connected switching valve with it is hydraulic
It is additionally provided with solenoid directional control valve on connection oil circuit between pump, to control the circulation of oil circuit between double-connected switching valve and hydraulic pump.
6. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that the slewing directional control valve is hand
Dynamic reversal valve, solenoid directional control valve or pilot operated directional control valve.
7. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that the slewing directional control valve is three
Position six-way transfer valve.
8. a kind of tool for crane transit telegram alarm device according to claim 1, characterized in that free rotary solenoid valve is two
Position four-way solenoid valve or 2/2-way solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811540527.8A CN109534193B (en) | 2018-12-17 | 2018-12-17 | Gyration alarm device for hoist |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811540527.8A CN109534193B (en) | 2018-12-17 | 2018-12-17 | Gyration alarm device for hoist |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109534193A true CN109534193A (en) | 2019-03-29 |
| CN109534193B CN109534193B (en) | 2019-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811540527.8A Active CN109534193B (en) | 2018-12-17 | 2018-12-17 | Gyration alarm device for hoist |
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| Country | Link |
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| CN (1) | CN109534193B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102336370A (en) * | 2010-07-26 | 2012-02-01 | 徐州重型机械有限公司 | Rotating hydraulic system of crane and its control method |
| CN102493967A (en) * | 2011-11-21 | 2012-06-13 | 三一汽车起重机械有限公司 | Crane, rotation control system thereof and rotation buffering valve of crane |
| CN202296935U (en) * | 2011-10-31 | 2012-07-04 | 徐州重型机械有限公司 | Warning device for rotation of rotary table and crane with warning device |
| CN102874698A (en) * | 2012-10-29 | 2013-01-16 | 徐州重型机械有限公司 | Device and method for preventing rotary mechanism from automatically rotating |
-
2018
- 2018-12-17 CN CN201811540527.8A patent/CN109534193B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102336370A (en) * | 2010-07-26 | 2012-02-01 | 徐州重型机械有限公司 | Rotating hydraulic system of crane and its control method |
| CN202296935U (en) * | 2011-10-31 | 2012-07-04 | 徐州重型机械有限公司 | Warning device for rotation of rotary table and crane with warning device |
| CN102493967A (en) * | 2011-11-21 | 2012-06-13 | 三一汽车起重机械有限公司 | Crane, rotation control system thereof and rotation buffering valve of crane |
| CN102874698A (en) * | 2012-10-29 | 2013-01-16 | 徐州重型机械有限公司 | Device and method for preventing rotary mechanism from automatically rotating |
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| Publication number | Publication date |
|---|---|
| CN109534193B (en) | 2019-12-20 |
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