CN112408222A - Tower device falls in tower crane emergency - Google Patents
Tower device falls in tower crane emergency Download PDFInfo
- Publication number
- CN112408222A CN112408222A CN202011430727.5A CN202011430727A CN112408222A CN 112408222 A CN112408222 A CN 112408222A CN 202011430727 A CN202011430727 A CN 202011430727A CN 112408222 A CN112408222 A CN 112408222A
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- emergency
- valve
- oil
- drainage channel
- emergency valve
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- 238000009434 installation Methods 0.000 claims description 13
- 238000003754 machining Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 102
- 238000007789 sealing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides an emergency tower descending device of a tower crane, which comprises an emergency oil drainage channel and an emergency valve; one end of the emergency oil drainage channel is communicated with a high-pressure volume cavity in the jacking oil cylinder, and the other end of the emergency oil drainage channel is communicated with an H port of a pump station; the emergency valve is arranged on the emergency oil drainage channel, and high-pressure oil in a high-pressure volume cavity in the jacking oil cylinder is prevented from flowing into the oil tank through the emergency oil drainage channel and the pump station H port under the non-emergency condition. In the invention, an emergency oil drainage channel is arranged, and the jacking oil cylinder can be drained in an emergency condition by utilizing an emergency valve arranged on the emergency oil drainage channel.
Description
Technical Field
The invention relates to the field of tower cranes, in particular to an emergency tower lowering device of a tower crane, which is an emergency pressure relief mechanism of a tower crane jacking oil cylinder.
Background
The tower crane needs to use a hydraulic jacking system when being installed and disassembled, and the Chinese patent of invention grant publication No. CN 103848358B provides the tower crane tower body double-cylinder jacking mechanism, which comprises a jacking outer sleeve frame and a standard joint, wherein a guide mechanism is arranged between the jacking outer sleeve frame and the standard joint, jacking cylinders are fixedly connected to two opposite sides of the jacking outer sleeve frame, the cylinder body of each jacking cylinder is fixed with a side cross beam of the jacking outer sleeve frame, the extending end of each piston rod faces downwards, and a jacking support device is fixed at the tail end of a piston rod in each jacking cylinder; when jacking action is carried out, the jacking supporting device can be in supporting connection with the horizontal cross beam of the standard joint, the piston rod of the jacking oil cylinder moves downwards, pressure is transmitted to the horizontal cross beam of the standard joint through the jacking supporting device, and the jacking outer sleeve frame fixedly connected with the jacking oil cylinder body is made to climb upwards. The jacking oil cylinder in the system is powered by a pump station and is used as an execution element to complete corresponding operation.
During the mounting and dismounting operation, a shaft pin or a bolt for connecting a tower crane sleeve frame, a front arm, a rear arm (generally called as an upper rotating part) and an upright post (a standard joint) needs to be dismounted, and the upper rotating part is lifted for a certain distance by a jacking oil cylinder so as to be separated from the main standard joint. And then adding or detaching the standard knot. The oil cylinder is provided with a hydraulic lock or a balance valve, so that the oil cylinder can stay at any position in the jacking process and cannot slide. When the tower is lowered, the pump station is required to provide certain pressure oil to open the hydraulic lock or the balance valve, so that the jacking oil cylinder returns to drive the upper rotating part to stably descend.
If power failure or pump station failure occurs in the process, the pump station cannot provide pressure oil, so that the oil cylinder cannot operate, and at the moment, the upper rotating part is only supported by the oil cylinder and is not connected with the standard joint, so that accidents are easy to happen.
Disclosure of Invention
The invention aims to provide a tower crane emergency descending device which is connected with a standard joint stably and needs to stably descend an upper rotating part to the standard joint under the condition of no power supply in emergency.
The technical scheme adopted by the invention for realizing the technical requirements is as follows: an emergency tower descending device of a tower crane comprises an emergency oil drainage channel and an emergency valve; one end of the emergency oil drainage channel is communicated with a high-pressure volume cavity in the jacking oil cylinder, and the other end of the emergency oil drainage channel is communicated with an H port of a pump station; the emergency valve is arranged on the emergency oil drainage channel, and high-pressure oil in a high-pressure volume cavity in the jacking oil cylinder is prevented from flowing into the oil tank through the emergency oil drainage channel and the pump station H port under the non-emergency condition.
Further, in the emergency tower descending device of the tower crane, the following components are adopted: the emergency valve is arranged in the cylinder head body of the jacking oil cylinder and is arranged on the side edge of the hydraulic control lock in the cylinder head body of the jacking oil cylinder, and in the emergency oil drainage channel, the downstream part of the emergency valve enters the hydraulic control lock and is superposed with the normal oil drainage channel of the hydraulic control lock.
Further, in the emergency tower descending device of the tower crane, the following components are adopted: the emergency valve is arranged in an emergency valve installation cavity formed by machining the side face of the cylinder head body and comprises an emergency valve body matched with the emergency valve installation cavity and an emergency valve cavity formed in the emergency valve body, the emergency oil drainage channel penetrates through the emergency valve cavity, one end of the emergency oil drainage channel is communicated with the high-pressure volume cavity to form an emergency inlet of the emergency valve, the other end of the emergency oil drainage channel is communicated with the hydraulic control lock normal oil drainage channel to form an emergency outlet of the emergency valve, and an emergency valve core is controlled by the emergency valve control mechanism to be opened and closed between the emergency inlet and the emergency outlet.
Further, in the emergency tower descending device of the tower crane, the following components are adopted: the emergency valve control mechanism comprises external threads which are arranged around the valve waist in the middle of a valve core of the emergency valve and are opposite to internal threads arranged at the corresponding position of a valve body of the emergency valve, and a conical valve tip arranged at the top of the valve core of the emergency valve, wherein the conical valve tip is matched with a conical opening of an emergency outlet, and the valve core of the emergency valve is rotated to axially move in the valve body of the emergency valve so as to change a gap between the conical valve tip and the conical opening of the emergency outlet.
Further, in the emergency tower descending device of the tower crane, the following components are adopted: the tail end of the valve core of the emergency valve is connected with the valve body of the emergency valve in a sealing mode through a clamping ring, the valve core of the emergency valve is connected with a locking nut through threads outside the clamping ring, and the locking nut is matched with the clamping ring to lock the valve core of the emergency valve.
Further, in the emergency tower descending device of the tower crane, the following components are adopted: the locking nut extends out of an emergency valve installation cavity on the side face of the cylinder head body, and a wrench position is arranged at the tail end of a valve core of the emergency valve outside the locking nut.
In the invention, an emergency oil drainage channel is arranged, and the jacking oil cylinder can be drained in an emergency condition by utilizing an emergency valve arranged on the emergency oil drainage channel.
In addition, in the invention, the emergency oil drainage channel and the emergency valve are arranged in the cylinder head body of the jacking oil cylinder, so that the additional facilities of the jacking oil cylinder are not increased, the installation is convenient, and the construction is not influenced.
The normal draining channel after the hydraulic control lock is coincided with the emergency draining channel, and the equipment variation is reduced.
The invention is further described with reference to the following figures and detailed description.
Drawings
Fig. 1 is a structural diagram of an emergency tower-descending device of a tower crane according to embodiment 1 of the present invention.
Fig. 2 is a structure and an installation diagram of an emergency valve according to embodiment 1 of the present invention.
FIG. 3 is a diagram showing an oil circuit of a lift cylinder in accordance with embodiment 1 of the present invention.
Detailed Description
Embodiment 1, this embodiment is a tower crane emergency tower device that falls, and specifically is a tower crane jacking cylinder is in the power failure or the pump station trouble, and the pump station can't provide pressure oil, when causing the jacking cylinder can't let out oil, the device of emergent draining.
As shown in fig. 3, which is a schematic diagram of the oil path of the lift-up cylinder of the embodiment, as shown in the figure, there are two oil pipes between the oil tank 300 and the lift-up cylinder 100, which are respectively an oil pipe 421 connected to the rodless cavity of the lift-up cylinder 100 and a rubber pipe 420 connected to the rod cavity of the lift-up cylinder 100. When the jacking oil cylinder 100 is required to jack the upper rotating part, the manual reversing valve 408 is manually switched to a jacking working position, the motor 402 drives the oil pump 401 to pump oil out of the oil tank, the hydraulic lock 103 is opened along the oil pipe 421, and the oil enters a rodless cavity of the jacking oil cylinder 100, so that the jacking oil cylinder 100 is lifted; when the jacking oil cylinder 100 is required to descend the upper rotating part, the manual reversing valve 408 is manually switched to a descending working position, the motor 402 drives the oil pump 401 to pump oil out of the oil tank and enter the rod cavity of the jacking oil cylinder 100 along the oil pipe 420, another group of control oil enters the hydraulic lock 103 and opens the hydraulic lock 103, and the oil in the rodless cavity returns to the pump station oil tank 300 along the oil pipe 421, so that the jacking oil cylinder 100 descends. The pumping station is also provided with a safety overflow valve 403, a high-pressure overflow valve 404, a low-pressure overflow valve 405, a manual reversing valve 408 and a pressure gauge 409. In addition, a liquid level gauge 301 is further provided in the oil tank 300 to measure the liquid level in the oil tank 300, to indicate the amount of measurement in the oil tank 300, and an air cleaner 303 is also provided to prevent impurities from entering the oil tank 300 when the oil tank 300 is filled with oil, and a filter 302 is further provided at the start position of the oil inlet pipe 420, that is, at the oil inlet, to filter the oil entering the oil inlet pipe 420 again, in order to protect various valves on the pipe. In this embodiment, in order to ensure that the hydraulic control lock 103 cannot work in case of power failure or other accidents, an emergency oil drainage device is provided, as shown in fig. 1 and 2, the emergency oil drainage device includes an emergency oil drainage channel 101 and an emergency valve 200; one end of the emergency oil drainage channel 101 is communicated with a high-pressure volume cavity 102 in the jacking oil cylinder 100, and the other end of the emergency oil drainage channel is communicated with an H port of a pump station; in fact, in this embodiment, the emergency oil drainage channel 101 is also installed in the head 102 of the jacking cylinder 100, as with the hydraulic lock 103, and a channel is formed in the head 102 to connect the high-pressure volume chamber 102 in the jacking cylinder 100 with the oil drainage pipe 421 downstream of the hydraulic lock 103, so that a long portion of the emergency oil drainage channel 101 coincides with the oil drainage pipe 421. An emergency valve 200 is arranged on a channel of a drain pipe 421 which is processed on a cylinder head body 102 and connected with a high-pressure volume cavity 102 in a jacking cylinder 100 and the downstream of a hydraulic control lock 103, when the hydraulic control lock works normally, the emergency valve 200 closes a channel which cuts off the high-pressure volume cavity 102 in the cylinder head body 102 and the drain pipe 421 at the downstream of the hydraulic control lock 103, leakage is controlled to drain normally by the hydraulic control lock 103, only when the hydraulic control lock 103 cannot work under power failure or other emergency conditions, an emergency drain device needs to be started, at the moment, the emergency valve 200 is opened to connect the high-pressure volume cavity 102 in the jacking cylinder 100 and the drain pipe 421, and the high-pressure volume cavity 102 in the jacking cylinder 100 is drained into an oil tank 300 through the drain pipe 421.
As shown in fig. 2, the emergency valve 200 is installed in an emergency valve installation cavity 102-1 formed by processing from the side of the cylinder head 102, the emergency valve installation cavity 102-1 itself communicates with the high pressure volume cavity 102 in the lift cylinder 100 by using the front part of the emergency oil drainage channel 101, the emergency valve 200 itself includes an emergency valve body 201 matching with the emergency valve installation cavity 102-1, in fact, some high pressure sealing rings are provided between the outside of the emergency valve 201 and the emergency valve installation cavity 102-1 to prevent the hydraulic oil in the emergency valve installation cavity 102-1 from leaking from the outlet of the emergency valve installation cavity 102-1 from the side of the cylinder head 102. An emergency valve cavity 202 is formed in the emergency valve body 201, the emergency oil drainage channel 101 penetrates through the emergency valve cavity 202, one end of the emergency oil drainage channel is communicated with the high-pressure volume cavity 102 to form an emergency inlet 203 of the emergency valve 200, the other end of the emergency oil drainage channel is communicated with the normal oil drainage channel 104 of the hydraulic lock 103 to form an emergency outlet 204 of the emergency valve 200, and the emergency valve spool 205 is controlled by an emergency valve control mechanism to realize connection and disconnection between the emergency inlet 203 and the emergency outlet 204. In practice, the emergency valve control mechanism can be selected by those skilled in the art, and any one of the emergency inlet 203 and the emergency outlet 204 can be blocked. In this embodiment, the emergency valve control mechanism includes an external thread arranged around a valve waist 205-1 in the middle of the emergency valve spool 205 and opposite to an internal thread arranged at a corresponding position of the emergency valve body 201, and a conical valve tip 205-2 arranged at the top of the emergency valve spool 205, the conical valve tip 205-2 is matched with a conical opening of the emergency outlet 204, the emergency valve spool 205 is rotated to axially move in the emergency valve body 201, a gap between the conical valve tip 205-2 and the conical opening of the emergency outlet 204 is changed, when the gap exists, oil leaks, the speed is faster when the gap is larger, and when the gap is completely sealed, the emergency outlet 204 is cut off. In this embodiment, a lock nut 206 is further provided to prevent the emergency valve spool 205 from rotating, and when the lock nut 206 is tightened, the emergency valve spool 205 will not rotate, preventing use in non-emergency situations. In this embodiment, the lock nut 206 extends out from the emergency valve installation cavity 102-1 on the side surface of the cylinder head body 102, so as to facilitate external operation, and a wrench position 208 is arranged at the tail end of the emergency valve spool 205 outside the lock nut 206.
In this embodiment, during jacking/tower removal operation: and (3) loosening the locking nut 206, rotating the emergency valve spool 205 clockwise through the adjusting wrench 208, and applying a certain pressing force to the conical valve tip 205-2 through transmission of the emergency valve spool 205, so that the conical valve tip 205-2 is tightly attached to the conical opening of the emergency outlet 204 to generate mechanical sealing, and the sealing effect of the mechanical sealing is close to zero leakage. And the locking nut 206 is screwed down to prevent the valve core 205 of the emergency valve from loosening due to vibration and affecting the sealing effect.
At the moment, the high-pressure volume cavity 102 is communicated with the inner cavity of the emergency valve 200 through the emergency passage 101 and the emergency inlet 203, the oil drainage pipe 421 for draining oil from the hydraulic control lock 103 is disconnected with the inner cavity of the emergency valve 200 due to the close fit of the conical valve tip 205-2 and the conical opening of the emergency outlet 204, and the formed mechanical seals achieve the effect of mutual isolation; the emergency oil drainage channel 101 and the external air are separated from each other by the rubber sealing ring and the red copper sealing gasket. The device is ensured to have no external leakage or internal leakage during normal operation, and the jacking/tower dismantling operation can be normally carried out.
When emergency tower descending is needed in abnormal conditions: the locking nut 206 is loosened, the emergency valve spool 205 is rotated anticlockwise through the adjusting wrench position 208, the external thread arranged around the valve waist 205-1 in the middle of the emergency valve spool 205 and opposite to the internal thread arranged at the corresponding position of the emergency valve body 201 drives the conical valve tip 205-2 to lift up, and the conical valve tip leaves the conical opening of the emergency outlet 204 to form an annular channel. The channel can be used for the jacking oil cylinder 100 high-pressure cavity oil to flow back to the oil containing tank 300 through the emergency channel 101, and the jacking oil cylinder 100 can descend. The path of the oil drainage is shown by the upper arrow in fig. 3.
The larger the area of the annular channel is, the faster the descending speed of the jacking oil cylinder is; the smaller the area of the annular channel is, the slower the descending speed of the jacking oil cylinder is.
The size of the area of the annular channel can be controlled by manually controlling the counterclockwise rotation angle of the adjusting wrench position 208 to control the lifting distance of the conical tip 205-2, so that the size of the area of the annular channel is controlled, and the descending speed of the oil cylinder is finally controlled. The stepless speed regulation of the descending speed of the jacking oil cylinder 100 can be realized.
The emergency valve core 205 cannot be lifted continuously after being lifted to touch the steel wire snap ring 207. The maximum area of the annular channel is controlled, and the over-high descending speed of the jacking oil cylinder is prevented; the valve core 205 can be prevented from being loosened and separated from the bottom valve seat 201 infinitely, and the high-pressure cavity oil is sprayed into the air.
After the function of the device for rapidly descending the tower is used, the device is required to be restored to the operating state of jacking/disassembling the tower.
Claims (6)
1. The utility model provides a tower crane emergency tower device that falls which characterized in that: comprises an emergency oil drainage channel (101) and an emergency valve (200); one end of the emergency oil drainage channel (101) is communicated with a high-pressure volume cavity (102) in the jacking oil cylinder (100), and the other end of the emergency oil drainage channel is communicated with an H port of a pump station; the emergency valve (200) is arranged on the emergency oil drainage channel (101) to prevent high-pressure oil in a high-pressure volume cavity (102) in the jacking oil cylinder (100) from flowing into an oil tank through the emergency oil drainage channel (101) through an H port of a pump station under the non-emergency condition.
2. The tower crane emergency lowering device of claim 1, wherein: the emergency valve (200) is arranged in a cylinder head body (102) of the jacking oil cylinder (100), the emergency valve is arranged on the side edge of a hydraulic control lock (103) in the cylinder head body (102) of the jacking oil cylinder (100), and in the emergency oil drainage channel (101), the downstream part of the emergency valve (200) enters the hydraulic control lock (103) and is overlapped with a normal oil drainage channel (104) of the hydraulic control lock (103).
3. The tower crane emergency lowering device of claim 2, wherein: the emergency valve (200) is arranged in an emergency valve mounting cavity (102-1) formed by machining the side face of the cylinder head body (102), and comprises an emergency valve body (201) matched with the emergency valve mounting cavity (102-1), an emergency valve cavity (202) is formed in the emergency valve body (201), the emergency oil drainage channel (101) penetrates through the emergency valve cavity (202), one end of the emergency oil drainage channel is communicated with the high-pressure volume cavity (102) to form an emergency inlet (203) of the emergency valve (200), the other end of the emergency oil drainage channel is communicated with a normal oil drainage channel (104) of the hydraulic lock (103) to form an emergency outlet (204) of the emergency valve (200), and a valve core (205) of the emergency valve is controlled by an emergency valve control mechanism to achieve connection and disconnection between the emergency inlet (203) and the emergency outlet (204).
4. The tower crane emergency lowering device of claim 3, wherein: the emergency valve control mechanism comprises external threads which are arranged on the periphery of a valve waist (205-1) in the middle of an emergency valve spool (205) and are opposite to internal threads arranged at the corresponding position of an emergency valve body (201), and a conical valve tip (205-2) arranged at the top of the emergency valve spool (205), wherein the conical valve tip (205-2) is matched with a conical opening of an emergency outlet (204), and the emergency valve spool (205) is rotated to axially move in the emergency valve body (201) so as to change a gap between the conical valve tip (205-2) and the conical opening of the emergency outlet (204).
5. The tower crane emergency lowering device of claim 4, wherein: the tail end of the valve core (205) of the emergency valve is hermetically connected with the valve body (201) of the emergency valve through a clamping ring (207), the valve core (205) of the emergency valve is connected with a locking nut (206) through threads outside the clamping ring (207), and the locking nut (206) is matched with the clamping ring (207) to lock the valve core (205) of the emergency valve.
6. The tower crane emergency lowering device of claim 5, wherein: the locking nut (206) extends out of an emergency valve installation cavity (102-1) on the side surface of the cylinder head body (102), and a wrench position (208) is arranged at the tail end of an emergency valve spool (205) on the outer side of the locking nut (206).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011430727.5A CN112408222A (en) | 2020-12-09 | 2020-12-09 | Tower device falls in tower crane emergency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011430727.5A CN112408222A (en) | 2020-12-09 | 2020-12-09 | Tower device falls in tower crane emergency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112408222A true CN112408222A (en) | 2021-02-26 |
Family
ID=74775430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011430727.5A Pending CN112408222A (en) | 2020-12-09 | 2020-12-09 | Tower device falls in tower crane emergency |
Country Status (1)
| Country | Link |
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| CN (1) | CN112408222A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08259182A (en) * | 1995-03-27 | 1996-10-08 | Tadano Ltd | Gentile stop device of crane |
| JPH09264258A (en) * | 1996-03-28 | 1997-10-07 | Tadano Ltd | Automatic stopping device for hydraulic working machine |
| CN201317632Y (en) * | 2008-10-23 | 2009-09-30 | 泰安市硕力液压设备厂 | Emergency pressure relief device for tower crane hydraulic jacking system |
| CN202296932U (en) * | 2011-10-26 | 2012-07-04 | 山东硕力机械制造有限公司 | Safety device for hydraulic jacking system of tower crane |
| CN104692266A (en) * | 2015-02-05 | 2015-06-10 | 三一汽车起重机械有限公司 | Hydraulic system for telescopic buffer of crane boom and crane |
| CN109231051A (en) * | 2018-09-29 | 2019-01-18 | 武汉船用机械有限责任公司 | Winch shear is self-locking and remote emergency hydraulic system and its operating method for an a kind of high position |
| CN214299018U (en) * | 2020-12-09 | 2021-09-28 | 广汉市正诚液压机械制造有限公司 | Tower device falls in tower crane emergency |
-
2020
- 2020-12-09 CN CN202011430727.5A patent/CN112408222A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08259182A (en) * | 1995-03-27 | 1996-10-08 | Tadano Ltd | Gentile stop device of crane |
| JPH09264258A (en) * | 1996-03-28 | 1997-10-07 | Tadano Ltd | Automatic stopping device for hydraulic working machine |
| CN201317632Y (en) * | 2008-10-23 | 2009-09-30 | 泰安市硕力液压设备厂 | Emergency pressure relief device for tower crane hydraulic jacking system |
| CN202296932U (en) * | 2011-10-26 | 2012-07-04 | 山东硕力机械制造有限公司 | Safety device for hydraulic jacking system of tower crane |
| CN104692266A (en) * | 2015-02-05 | 2015-06-10 | 三一汽车起重机械有限公司 | Hydraulic system for telescopic buffer of crane boom and crane |
| CN109231051A (en) * | 2018-09-29 | 2019-01-18 | 武汉船用机械有限责任公司 | Winch shear is self-locking and remote emergency hydraulic system and its operating method for an a kind of high position |
| CN214299018U (en) * | 2020-12-09 | 2021-09-28 | 广汉市正诚液压机械制造有限公司 | Tower device falls in tower crane emergency |
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