CN105621302B - anti-stall device and crane - Google Patents
anti-stall device and crane Download PDFInfo
- Publication number
- CN105621302B CN105621302B CN201610173613.4A CN201610173613A CN105621302B CN 105621302 B CN105621302 B CN 105621302B CN 201610173613 A CN201610173613 A CN 201610173613A CN 105621302 B CN105621302 B CN 105621302B
- Authority
- CN
- China
- Prior art keywords
- oil circuit
- hydraulic pump
- flow oil
- hydraulic
- fuel tank
- 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.)
- Expired - Fee Related
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Classifications
-
- 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
-
- 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
Abstract
The present invention relates to a kind of anti-stall device, including hydraulic buffer system and mechanical link, hydraulic buffer system includes hydraulic pump and fuel tank, and the normally opened through-flow oil circuit between hydraulic pump and fuel tank, control oil circuit and buffer through-flow oil circuit, mechanical link is connected to hydraulic pump so that the rotation of reel is passed into hydraulic pump and drives hydraulic pump to rotate, normally opened through-flow oil circuit is used for when the outlet pressure of hydraulic pump is less than setting value, allow fluid often to open stream oil circuit and be delivered to fuel tank from hydraulic pump, when the outlet pressure of hydraulic pump is more than or equal to setting value, normally opened through-flow oil circuit is closed, control oil circuit and buffer through-flow oil circuit and open, the buffered through-flow oil circuit of fluid is allowed to be delivered to fuel tank from hydraulic pump.The present invention also provides a kind of crane for including above-mentioned anti-stall device.Above-mentioned anti-stall device reliability is high, response is fast, and reel drives hydraulic pump to rotate by mechanical link, it is slow during hydraulic pump impact is not present, stable movement is with small vibration.
Description
Technical field
The present invention relates to technical field of engineering machinery, more particularly to a kind of anti-stall device and crane.
Background technology
Foundation brakes brake force transfer route is long during crane brake, lifted load is heavy, working environment is severe, operation
Frequently, easily because hook slipping of crane phenomenon occurs for electric, mechanical breakdown or operation reason, this is the operation of long-standing problem hoisting machinery
The major issue of safety.To ensure crane hoisting job safety,《Hoist design specification》It is required that in important lifting mechanism
With deadman's brake is installed on jib lubbing mechanism.
In real work, generally a normally closed type hydraulic tongs is set to pass through hydraulic pressure as deadman's brake on drum wheels side
Realize friction catch in the braking chuck clamping drum wheels side of safety tongs.Because friction plate acutely generates heat in braking procedure, commonly rub
The thermal stability limit of the pad braking distance of brake；Meanwhile be present certain response time in hydraulic safe pincers, braking
Hook slipping of crane causes lift heavy kinetic energy to increase sharply before device response, and the distance needed for lift heavy brake exceedes the system that brake can bear
Dynamic distance, so that brake fade.In addition, hook accident is slipped when crane is in hoisting heavy, due to decelerator and pulley
Group accelerating function, lifting motor, power transmission shaft, reel can with the acceleration downslide of lift heavy overswing, foundation brakes and peace
Full application of brake device also produces huge radial vibration therewith, and brake scotch can be produced brokenly by huge radial impact in brake process
It is bad, it significantly limit the reliability of braking.
The content of the invention
Based on this, it is necessary to provide the anti-stall device and crane that a kind of response is very fast, reliability is higher.
A kind of anti-stall device, for connecting the reel of crane, it includes hydraulic buffer system and mechanical link,
The mechanical link is connected between the reel and the hydraulic buffer system, and the hydraulic buffer system includes hydraulic pressure
Pump and fuel tank, and normally opened through-flow oil circuit, control oil circuit and the through-flow oil of buffering between the hydraulic pump and the fuel tank
Road, the mechanical link are connected to the hydraulic pump so that the rotation of the reel is passed into the hydraulic pump and drives institute
Hydraulic pump rotation is stated, the normally opened through-flow oil circuit is used for when the outlet pressure of the hydraulic pump is less than setting value, it is allowed to fluid
The fuel tank is delivered to from the hydraulic pump through the normally opened through-flow oil circuit, is more than or equal in the outlet pressure of the hydraulic pump
During the setting value, the normally opened through-flow oil circuit is closed, and the control oil circuit and the through-flow oil circuit of buffering are opened, it is allowed to fluid
Through the through-flow oil circuit of buffering the fuel tank is delivered to from the hydraulic pump.
Above-mentioned anti-stall device is determined by the size of the outlet pressure according to the hydraulic pump directly related with drum speed
Whether row buffering is entered, and reliability is high；And hydraulic buffer system is passive buffering, buffering through-flow oil circuit by the triggering of control oil circuit opens
Open, it is not necessary to which electric-controlled hydraulic pumping plant starts, and brake force output is fast, and response is fast；Reel drives hydraulic pump by mechanical link
Rotation, collided relative to the moment impact between brake scotch and wheel hub during brake, it is slow during hydraulic pump be not present
Mechanical shock is collided, and stable movement is with small vibration.
In one of the embodiments, the normally opened through-flow oil circuit is provided with pressure detecting element, for detecting the liquid
The outlet pressure of press pump, to decide whether to close the normally opened through-flow oil circuit.
In one of the embodiments, choke valve is additionally provided with the normally opened through-flow oil circuit, the choke valve is located at described
Between pressure detecting element and the fuel tank.
In one of the embodiments, adjustable sluice valve is additionally provided with the normally opened through-flow oil circuit, is set on the control oil circuit
There are hydraulic motor and the freewheel clutch between the hydraulic motor and the adjustable sluice valve.
In one of the embodiments, overflow valve is additionally provided with the control oil circuit, the overflow valve is located at the hydraulic pressure
Between motor and the fuel tank.
In one of the embodiments, choke valve is additionally provided with the control oil circuit, the choke valve is located at the hydraulic pressure
Between pump and the hydraulic motor.
In one of the embodiments, the through-flow oil circuit of buffering is provided with buffer element, and the buffer element is used for root
According to the inlet pressure of the overflow valve and the relation of setting value, its state closed or opened is determined.
In one of the embodiments, the buffer element is inserted valve, the import of the inserted valve and the hydraulic pump
Outlet, outlet connected with the fuel tank, control port is connected to the control oil circuit.
In one of the embodiments, the mechanical connecting structure includes the first driving member being coaxially disposed with the reel
With the second driving member being coaxially disposed with the hydraulic pump, first driving member and second driving member drive connection, institute
Drive first driving member to rotate when stating spool turns, so as to drive second driving member to rotate, and then drive the liquid
Press pump rotates.
The present invention also provides a kind of crane, and it includes reel and above-mentioned anti-stall device, and the reel is connected to institute
State the mechanical link of anti-stall device.
The anti-stall device of crane passes through the big of the outlet pressure according to the hydraulic pump directly related with drum speed
It is small to decide whether into row buffering, reliability height；And hydraulic buffer system is passive buffering, through-flow oil is buffered by the triggering of control oil circuit
Open on road, it is not necessary to which electric-controlled hydraulic pumping plant starts, and brake force output is fast, and response is fast；Reel passes through mechanical link band hydrodynamic
Press pump rotates, and is collided relative to the moment impact between brake scotch and wheel hub during brake, it is slow during hydraulic pump not
Mechanical shock collision be present, stable movement is with small vibration.
Brief description of the drawings
Fig. 1 is the structural representation of the anti-stall device of an embodiment；
Fig. 2 is the hydraulic schematic diagram of the anti-stall device shown in Fig. 1.
Marked in figure：Hydraulic buffer system 10, mechanical link 20, reel 90, hydraulic pump 102, fuel tank 104, pressure
Detecting element 106, choke valve 108, adjustable sluice valve 110, hydraulic motor 112, freewheel clutch 114, overflow valve 116, choke valve
118, buffer element 120, trimmer valve block 122, the first driving member 202, the second driving member 204.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give the preferred embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more saturating
It is thorough comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement are for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all combination of the Listed Items of pass.
As depicted in figs. 1 and 2, a kind of anti-stall device of this preferred embodiment, for connecting the reel 90 of crane, bag
Include hydraulic buffer system 10 and mechanical link 20, mechanical link 20 be connected to reel 90 and hydraulic buffer system 10 it
Between, hydraulic buffer system 10 includes hydraulic pump 102 and fuel tank 104, and normally opened between hydraulic pump 102 and fuel tank 104
Through-flow oil circuit, control oil circuit and the through-flow oil circuit of buffering, mechanical link 20 are connected to hydraulic pump 102 with by the rotation of reel 90
Pass to hydraulic pump 102 and drive hydraulic pump 102 to rotate, normally opened through-flow oil circuit is used to be less than in the outlet pressure of hydraulic pump 102
During setting value, it is allowed to which fluid often opens stream oil circuit and is delivered to fuel tank 104 from hydraulic pump 102, in the outlet pressure of hydraulic pump 102
During more than or equal to setting value, normally opened through-flow oil circuit is closed, and control oil circuit and the through-flow oil circuit of buffering are opened, it is allowed to a large amount of fluid warps
Buffer through-flow oil circuit and be delivered to fuel tank 104 from hydraulic pump 102, realize buffering, prevent crane stall.
It should be noted that the reel 90 of anti-stall device connection crane described in the present embodiment, can be anti-mistake
Speed variator is directly connected in reel 90, can also be indirectly coupled to reel 90, i.e. anti-stall device may connect to synchronous with reel 90
Other rotating mechanisms rotated.
When crane installs above-mentioned anti-stall device, in crane normal work, the rotating speed of reel 90 is relatively low, hydraulic pressure
The outlet pressure of pump 102 is relatively low, and fluid often opens stream oil circuit and flow to fuel tank 104；During crane stall, reel 90 turns at a high speed
Dynamic, driving hydraulic pump 102, also high-speed rotation, substantial amounts of fluid suction out from fuel tank 104, the outlet pressure increase of hydraulic pump 102,
When the outlet pressure of hydraulic pump 102 is more than setting value, normally opened through-flow oil circuit is closed, and control oil circuit and the through-flow oil circuit of buffering are opened
Open, hydraulic system buffering energy-absorbing.
In this anti-stall device, pass through the big of the outlet pressure according to the hydraulic pump 102 directly related with the rotating speed of reel 90
It is small to decide whether into row buffering, reliability height；It is through-flow by control oil circuit triggering buffering and hydraulic buffer system 10 is passive buffering
Oil circuit is opened, it is not necessary to which electric-controlled hydraulic pumping plant starts, and brake force output is fast, and response is fast；Reel is driven by mechanical link
Hydraulic pump rotates, and is collided relative to the moment impact between brake scotch and wheel hub during brake, it is slow during hydraulic pump
Collided in the absence of mechanical shock, stable movement is with small vibration.
Referring to Fig. 2, in the present embodiment, normally opened through-flow oil circuit is provided with pressure detecting element 106, for detecting hydraulic pump
102 outlet pressure, to decide whether to close normally opened through-flow oil circuit.Specifically, pressure detecting element 106 is normally opened two-way order
Valve, the outlet of its oil inlet and hydraulic pump 102, when the outlet pressure of hydraulic pump 102 is less than setting value, normally opened two is clear and coherent
Sequence valve is opened, it is allowed to which fluid flows through from normally opened through-flow oil circuit.
In the present embodiment, choke valve 108 is additionally provided with normally opened through-flow oil circuit, choke valve 108 is located at pressure detecting element 106
Between fuel tank 104.When crane stall, due to the damping action of choke valve 108, the outlet pressure of hydraulic pump 102 will be aobvious
Write increase.
In the present embodiment, adjustable sluice valve 110 is additionally provided with normally opened through-flow oil circuit, control oil circuit is provided with hydraulic motor 112
And the freewheel clutch 114 between hydraulic motor 112 and adjustable sluice valve 110.Be more than when the outlet pressure of hydraulic pump 102 or
During equal to setting value, normally opened through-flow oil circuit is closed, and through controlling oil circuit to flow to fuel tank 104, hydraulic motor 112 is revolved fluid by driving
Turn, and pass through freewheel clutch 114 drive close adjustable sluice valve 110 so that weight is decelerated to stop during, hydraulic pump 102
Outlet pressure decline, normally opened through-flow oil circuit will not be again turned on and stall again.Specifically, the output shaft of hydraulic motor 112
It is connected by freewheel clutch 114 with the input shaft of adjustable sluice valve 110.
In the present embodiment, control and be additionally provided with overflow valve 116 on oil circuit, the setting pressure of overflow valve 116 is above-mentioned setting value.
Specifically, overflow valve 116 is located between hydraulic motor 112 and fuel tank 104.
In the present embodiment, control and be additionally provided with choke valve 118 on oil circuit, choke valve 118 is located at hydraulic pump 102 and hydraulic motor
Between 112.
In the present embodiment, buffer through-flow oil circuit and be provided with buffer element 120, buffer element 120 is used for according to hydraulic pump 102
Outlet pressure and setting value relation, determine its close or open state.When the outlet pressure of hydraulic pump 102 is more than setting
During value, buffer element 120 is opened, and the buffered through-flow oil circuit of fluid flow to fuel tank 106, carries out energy-absorbing buffering.Specifically, cushioning element
Part 120 is inserted valve, the import of inserted valve and the outlet of hydraulic pump 102, and outlet connects with fuel tank 104, and control port connects
Control oil circuit is connected to, is specifically connected between the overflow valve 116 and hydraulic motor 112 on control oil circuit.Set by overflow valve 116
Determine cushion effect, the flow of hydraulic oil is controlled by inserted valve, cushion effect output is steady, ensures safe wire cable in braking procedure.
Specifically, above-mentioned normally opened through-flow oil circuit, control oil circuit and the through-flow oil circuit of buffering are located at trimmer valve block 122 (see figure
1) on.
Referring to Fig. 1, mechanical connecting structure 20 includes the first driving member 202 and and hydraulic pump being coaxially disposed with reel 90
102 the second driving members 204 being coaxially disposed, the first driving member 202 and the second driving member 204 are connected, when reel 90 rotates
Drive the first driving member 202 to rotate, so as to drive the second driving member 204 to rotate, and then drive hydraulic pump 102 to rotate.Specifically,
First driving member 202 can be gear wheel, and the second driving member 204 can be little gear 204, and gear wheel engages with little gear.It can manage
Other transmission mechanisms beyond solution, the first driving member 202 and the second driving member 204 or gear, as long as speedup can be realized i.e.
Can.
During crane normal work, the rotating speed of reel 90 is relatively low, and the outlet pressure of hydraulic pump 102 is relatively low, hydraulic cushion system
The inserted valve and overflow valve 116 of system 10 are turned off, and buffer through-flow oil circuit and control oil circuit is obstructed, normally opened through-flow oil circuit is opened, and is permitted
Perhaps fluid often opens stream oil circuit from hydraulic pump 102 and flow to fuel tank 104, and hydraulic buffer system 10 does not play buffering energy-absorbing.
When crane stall, reel 90 rotates at a high speed, and the number of teeth of the first driving member 202 is the several times of the number of teeth of the second driving member 204,
Accelerating function is played, the second driving member 204 driving hydraulic pump 102 rotates at a high speed, and substantial amounts of fluid suctions out from fuel tank, normally opened
Under the damping action of through-flow oil circuit, the outlet pressure of hydraulic pump 102 dramatically increases；The outlet pressure of hydraulic pump 102 is higher than normally opened
During the setting pressure of two-way sequence valve and overflow valve 116, normally opened through-flow oil circuit is closed, and control oil circuit and the through-flow oil circuit of buffering are opened
Open, hydraulic system buffering energy-absorbing；In buffering course, hydraulic motor 112 closes adjustable sluice valve 110 by freewheel clutch 114,
So that weight is decelerated to during stopping, the outlet pressure of hydraulic pump 102 declines, and normally opened through-flow oil circuit will not be again turned on；Weight
After braking stops, positioned in midair, the lifting mechanism of crane is needed to be again started up weight, and weight is slowly put down, at this moment needed
The setting pressure of manual or automatically controlled adjustment overflow valve 116, reduces the resistance that anti-stall device moves to lifting mechanism, delays weight
Slowly decline and land.
The present invention also provides a kind of crane, and it includes reel 90 and above-mentioned anti-stall device, and reel 90 is connected to anti-mistake
The mechanical link 20 of speed variator.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. anti-stall device, for connecting the reel of crane, it is characterised in that：Including hydraulic buffer system and machinery even Connection mechanism, the mechanical link are connected between the reel and the hydraulic buffer system, the hydraulic buffer system Including hydraulic pump and fuel tank, and normally opened through-flow oil circuit between the hydraulic pump and the fuel tank, control oil circuit ease up Through-flow oil circuit is rushed, the mechanical link is connected to the hydraulic pump so that the rotation of the reel is passed into the hydraulic pump And drive the hydraulic pump to rotate, the normally opened through-flow oil circuit is used for when the outlet pressure of the hydraulic pump is less than setting value, Fluid is allowed to be delivered to the fuel tank from the hydraulic pump through the normally opened through-flow oil circuit, it is big in the outlet pressure of the hydraulic pump When the setting value, the normally opened through-flow oil circuit is closed, and the control oil circuit and the through-flow oil circuit of buffering are opened, Fluid is allowed to be delivered to the fuel tank from the hydraulic pump through the through-flow oil circuit of buffering.
- 2. anti-stall device according to claim 1, it is characterised in that the normally opened through-flow oil circuit is provided with pressure detecting Element, for detecting the outlet pressure of the hydraulic pump, to decide whether to close the normally opened through-flow oil circuit.
- 3. anti-stall device according to claim 2, it is characterised in that be additionally provided with throttling on the normally opened through-flow oil circuit Valve, the choke valve are located between the pressure detecting element and the fuel tank.
- 4. the anti-stall device according to Claims 2 or 3, it is characterised in that being additionally provided with the normally opened through-flow oil circuit can Adjust gate valve, it is described control oil circuit be provided with hydraulic motor and between the hydraulic motor and the adjustable sluice valve surmount from Clutch.
- 5. anti-stall device according to claim 4, it is characterised in that be additionally provided with overflow valve on the control oil circuit, institute Overflow valve is stated to be located between the hydraulic motor and the fuel tank.
- 6. anti-stall device according to claim 4, it is characterised in that be additionally provided with choke valve on the control oil circuit, institute Choke valve is stated to be located between the hydraulic pump and the hydraulic motor.
- 7. anti-stall device according to claim 5, it is characterised in that the through-flow oil circuit of buffering is provided with cushioning element Part, the buffer element are used for according to the inlet pressure of the overflow valve and the relation of setting value, determine what it was closed or opened State.
- 8. anti-stall device according to claim 7, it is characterised in that the buffer element is inserted valve, the inserting The import of valve and the outlet of the hydraulic pump, outlet connect with the fuel tank, and control port is connected to the control oil circuit.
- 9. anti-stall device according to claim 1, it is characterised in that the mechanical connecting structure includes and the reel The first driving member being coaxially disposed and the second driving member being coaxially disposed with the hydraulic pump, first driving member and described Two driving members are connected, and drive during the spool turns first driving member to rotate, so as to drive second driving member Rotate, and then drive the hydraulic pump to rotate.
- 10. a kind of crane, it is characterised in that the crane includes reel and prevented as described in claim any one of 1-9 Stall device, the reel are connected to the mechanical link of the anti-stall device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610173613.4A CN105621302B (en) | 2016-03-24 | 2016-03-24 | anti-stall device and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610173613.4A CN105621302B (en) | 2016-03-24 | 2016-03-24 | anti-stall device and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105621302A CN105621302A (en) | 2016-06-01 |
| CN105621302B true CN105621302B (en) | 2018-01-02 |
Family
ID=56036713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610173613.4A Expired - Fee Related CN105621302B (en) | 2016-03-24 | 2016-03-24 | anti-stall device and crane |
Country Status (1)
| Country | Link |
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| CN (1) | CN105621302B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582024B (en) * | 2021-06-17 | 2022-09-20 | 中联重科股份有限公司 | Negative power control method, equipment and system for crane and crane |
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|---|---|---|---|---|
| CN102050400A (en) * | 2010-12-16 | 2011-05-11 | 大连华锐股份有限公司 | Passive overspeed protective device used for lifting drum of crane |
| CN201991851U (en) * | 2011-04-18 | 2011-09-28 | 朱天锡 | Open-type hydraulic drive system having hydraulic reversing buffering function |
| CN203143550U (en) * | 2013-01-11 | 2013-08-21 | 中国矿业大学 | Hydraulic tensioning device for belt conveyor |
| CN204357810U (en) * | 2014-12-22 | 2015-05-27 | 湖州师范学院 | A kind of control gear of Hydraulic for lifting load lift |
| CN204675707U (en) * | 2015-05-19 | 2015-09-30 | 湖南汽车工程职业学院 | A kind of mine rescue machine |
| CN204873620U (en) * | 2015-08-03 | 2015-12-16 | 河南省三马起重机械有限公司 | Caterpillar crane does not have rising of explosion -proof valve and rises system |
| CN105347216A (en) * | 2015-12-02 | 2016-02-24 | 北华航天工业学院 | High-reliability mining elevator hydraulic control system |
-
2016
- 2016-03-24 CN CN201610173613.4A patent/CN105621302B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102050400A (en) * | 2010-12-16 | 2011-05-11 | 大连华锐股份有限公司 | Passive overspeed protective device used for lifting drum of crane |
| CN201991851U (en) * | 2011-04-18 | 2011-09-28 | 朱天锡 | Open-type hydraulic drive system having hydraulic reversing buffering function |
| CN203143550U (en) * | 2013-01-11 | 2013-08-21 | 中国矿业大学 | Hydraulic tensioning device for belt conveyor |
| CN204357810U (en) * | 2014-12-22 | 2015-05-27 | 湖州师范学院 | A kind of control gear of Hydraulic for lifting load lift |
| CN204675707U (en) * | 2015-05-19 | 2015-09-30 | 湖南汽车工程职业学院 | A kind of mine rescue machine |
| CN204873620U (en) * | 2015-08-03 | 2015-12-16 | 河南省三马起重机械有限公司 | Caterpillar crane does not have rising of explosion -proof valve and rises system |
| CN105347216A (en) * | 2015-12-02 | 2016-02-24 | 北华航天工业学院 | High-reliability mining elevator hydraulic control system |
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| CN105621302A (en) | 2016-06-01 |
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