CN103848374B - Manual forklift hydraulic safe system - Google Patents
Manual forklift hydraulic safe system Download PDFInfo
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- CN103848374B CN103848374B CN201410108004.1A CN201410108004A CN103848374B CN 103848374 B CN103848374 B CN 103848374B CN 201410108004 A CN201410108004 A CN 201410108004A CN 103848374 B CN103848374 B CN 103848374B
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Abstract
The invention discloses a kind of manual forklift hydraulic safe system.The present invention is provided with pressure compensation regulating module, a kind of manual forklift hydraulic safe system, including Manpowered pump, accumulator, ejection assembly, also include preventing unexpected generation and pressure compensation regulating module that moment falls, possess latch functions and regulation liquid stream direction changes the manual reverse of direction assembly of system health and prevents the overflow assemblies of overload；Described pressure compensation regulating module connects with ejection assembly and manual reverse of direction assembly respectively；Described Manpowered pump connects with manual reverse of direction assembly and overflow assemblies respectively, and overflow assemblies connects with manual reverse of direction assembly.Possess automatic current limiting, speed limit, decrease speed by automatic speed-limiting to setting value, even if accidentally there is maloperation, oil cylinder also will not decline rapidly, plays slow fall effect, then native system is safe, 2, the design of manual reverse of direction assembly, decrease speed is controlled, i.e. can reach the controlled purpose of speed with the uninterrupted of Artificial Control cone shaped one-way valve；3, the design of overflow assemblies has anti-overload dress, and protection car damages from overload is lower, it is ensured that the service life of device.The invention belongs to mechanical equipment technical field.
Description
Technical field
The invention belongs to hand-hydraulic forklift technical field, also referred to as hand-hydraulic carrier-and-stacker, or claim manual hydraulic tray heap high
Car, also has title hand fork lifter, is commonly called as manual forklift, pacifies particularly with regard to its core hydraulic system of this type of manual forklift
Full technology.
Background technology
Manual forklift is with manpower as power source, possess hoist, stacking and closely carry function, belong to a kind of non-maneuver work
Industry vehicle, its work that hoists mainly is driven hydraulic hoist unit to complete by manpower, and this hydraulic means is similar to and hydraulic jack
Top, this hydraulic means typically is waited until to form by fuel tank, pump, valve, oil cylinder, and the operation principle of pump is: hand or foot-operated make pump
Bar depress, pump rod return then relies on spring, and it is a stroke that pump rod makes a round trip, and arrange, oil suction once, this is this liquid
The hydraulic power source of pressure system, if operating the valve rod of wherein control valve, then feasible system rising, suspend, decline and wait until operating mode,
If in conjunction with other parts and components of vehicle, such as: wheel, chassis door frame, goods shelf, pallet fork, chain, roller etc.,
Then form the machinery of complete set, hydraulic pressure lift mobile device, it is achieved the function hoisting, decline and moving, due to without volume
Outer power, is widely used, bearing capacity is big, economy is the most sturdy, is the universal a kind of stacking of application, handbarrow vehicle.
But without any current limliting, speed-limiting device in the hydraulic system of existing manual forklift, when goods is by fluid power jacking to eminence,
Unless you give your whole attention to it or occur maloperation time, the hydraulic oil in oil cylinder is back to rapidly fuel tank, and oil cylinder now is owing to losing fluid power
Support, and originally stored in the weight of the certain altitude that hoists and have potential energy now to act on oil cylinder, then weight can be freely to fall
Body state pushes oil cylinder tenesmus, and goods immediately falls downwards from eminence, the most then damage goods or facility, the personal thing of heavy then generation
Therefore, there is the biggest potential safety hazard.
Governor valve technology in fork truck is exactly to prevent the device of accidental falling, if China Patent No. is CN2009201190510
Chinese patent, a kind of governor valve, it includes valve body, spool, spring, and wherein in valve body, valve pocket is provided with spool and spring,
One end of valve body is set to connect the oil-in of oil cylinder, and the other end of valve body is sealedly connected with joint, is set with valve outside spool
Overlapping, valve pocket opens center cavity near one end of oil-in, and center cavity side-wall hole, by the water conservancy diversion between valve pocket and valve pocket
Chamber valve port supermedial with valve pocket connects, and valve port, by the fuel feed hole on spool face, connects with the center cavity of spool, spool
Center cavity one end of joint is provided with restricting orifice, spring supporting is between spool and joint, and it is by air relief valve and joint
The principle of stream valve unites two into one, and working stability, flow are little by load effect, can effectively control speed when fork truck even load declines
Angle value, thus ensure that fork truck, when placing the load promoted, smoothly falls.
And for example China Patent No. is the Chinese patent of CN201320101597X, fork truck safety speed-limit valve, including valve body and valve gap,
Valve gap is spirally connected and is fixed on valve body, is inserted with valve pocket in valve body, is inserted with spool in valve pocket, spring one end is pressed on valve gap,
The other end is pressed on spool, and spool upper sleeve has flow-stopping plate, collar to be fastened on spool, and collar press against flow-stopping plate, flow-stopping plate
It is pressed on the spool step of spool；The rear portion, center spool hole of spool forms inclined-plane, and steel ball is placed in the rear portion in center spool hole,
The rear portion of spool forms the valve pocket centre bore of lateral cylindrical void and valve pocket and connects mutually；Valve pocket main oil-hole and spool is formed on valve pocket
Spool main oil-hole connect mutually, spool main oil-hole connects mutually with center spool hole.It will ensure that fork truck oil return speed is steady, with
Time fork truck oil-feed speed quick.
But upper described a kind of governor valve and fork truck safety speed-limit valve, have 4 weak points: 1, need one group to bypass
Check valve, in order to forward fluid can proper flow, backflow fluid can be cut off, again and Ling She mono-tunnel for the oil of choke valve
Road；2, structure is complicated, and the number of components of composition is more, easy break-down；3, it is necessarily external, to be applicable to pipeline connection,
Also the inner space that vehicle is limited is taken；4, fork truck is again powered industrial truck, and its hydraulic power source is provided by dynamical system, therefore
And such technology is not suitable for non-maneuver industrial vehicle, be more not suitable for manual forklift hydraulic system.
In sum, prior art is also unable to reach compact conformation and prevents the generation of accidental falling；Prior art is the most easily missed
Overload, fragile device.
Summary of the invention
The technical problem to be solved is: provide a kind of manual forklift hydraulic safe system, it is possible to achieve automatic limiting
Stream, speed limit, prevent accidental falling from occurring；Avoid overload, it is ensured that the operational reliability of hydraulic system and service life, simultaneously
Also take into account compact conformation.
The technical solution used in the present invention is: a kind of manual forklift hydraulic safe system, including Manpowered pump, accumulator,
Ejection assembly, also includes preventing unexpected generation and pressure compensation regulating module that moment falls, possesses latch functions and regulation liquid
Flow path direction changes the manual reverse of direction assembly of system health and prevents the overflow assemblies of overload；Described pressure compensation regulating module
Connect with ejection assembly and manual reverse of direction assembly respectively；Described Manpowered pump connects with manual reverse of direction assembly and overflow assemblies respectively,
Overflow assemblies connects with manual reverse of direction assembly.
Described pressure compensation regulating module includes throttle valve body, throttling valve core, spring, and throttling valve core is cup-shaped, choke valve
Core right-hand member is provided with an axial throttle orifice, and throttling valve core is enclosed within spring, throttling valve core and spring coordinate in throttle valve body and
Reciprocating can be done；The choke valve axially extending bore of throttle valve body right-hand member connects with ejection assembly；Choke valve body wall be provided with
The throttle orifice that the throttling valve core direction of motion is intersected, throttle orifice connects with manual reverse of direction assembly.
Described throttle valve body left end forms the 4th fluid chamber, and described throttle valve body right-hand member forms the 5th fluid chamber.
Described manual reverse of direction assembly, include the most successively left valve barrel, cone valve spring, poppet valve core, middle valve body, steel ball,
Right valve barrel, valve rod spring, valve rod, arrange in same axis, and cone valve spring, poppet valve core and left valve barrel form one group of check valve,
Middle valve body, steel ball form another group check valve, right valve barrel, valve rod spring, valve rod composition controlling organization；The cone of poppet valve core
Small end and steel ball are respectively positioned in middle valve body；Poppet valve core and steel ball being turned on and off of two ends, valve body left and right in controlling；Valve rod
For promoting steel ball to move；Middle valve inner forms the second fluid chamber, and the second fluid chamber connects with Manpowered pump.
Stroke gap it is provided with between described steel ball and valve rod.
Described overflow assemblies is ball direct acting type overflow valve.
The valve body front portion of described overflow valve is overflow ball, and middle part is overflow spring, and afterbody is provided with the micrometer adjusting screw of regulation pressure.
Described Manpowered pump is single pole or the reciprocating single-acting pump of double-rod.
Described Manpowered pump force form is that hands is pulled, ridden two-in-one mechanism, or individually hands trigger structure, or individually footstep mechanism.
Described ejection assembly is oil cylinder, and described cylinder structure is plunger type or piston type.
The invention has the beneficial effects as follows: the present invention is provided with pressure compensation regulating module possess automatic current limiting, speed limit, lower reduction of speed
Degree is by automatic speed-limiting to setting value, even if accidentally there is maloperation, oil cylinder also will not decline rapidly, plays slow fall effect, then
Native system is safe, 2, the design of manual reverse of direction assembly, and decrease speed is controlled, i.e. can be with Artificial Control cone shaped one-way valve
Uninterrupted, reach the controlled purpose of speed；3, the design of overflow assemblies has anti-overload dress, and protection car is from overload
Lower damage, it is ensured that the service life of device.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
In figure, 1, Manpowered pump, 2, middle valve body, 3, cone valve spring, 4, manual reverse of direction assembly, 5, poppet valve core, 6, left
Valve body, 7, throttle valve body, 8, pressure compensation regulating module, 9, spring, 10, throttling valve core, 10.1, throttle spindle
To through hole, 11, ejection assembly, 12, accumulator, 13, valve rod spring, 14, valve rod, 15, right valve barrel, 16, overflow
Assembly, 16.1, micrometer adjusting screw, 16.2, overflow spring.16.3 overflow balls, 17, steel ball, a, the first fluid chamber, b,
Second fluid chamber, c, the 3rd fluid chamber, d, throttle orifice, e, the 4th fluid chamber, f, the 5th fluid chamber.
Detailed description of the invention
Shown in Figure 1, a kind of manual forklift hydraulic safe system, including Manpowered pump 1, accumulator 12, ejection assembly
11, also include preventing unexpected generation and pressure compensation regulating module 8 that moment falls, possess latch functions and regulation liquid stream side
To changing the manual reverse of direction assembly 4 of system health and preventing the overflow assemblies 16 of overload；Described pressure compensation regulating module
8 connect with ejection assembly 11 and manual reverse of direction assembly 4 respectively；Described Manpowered pump 1 respectively with manual reverse of direction assembly 4 and overflow
Assembly 16 connects, and overflow assemblies 16 connects with manual reverse of direction assembly 4.
Pressure compensation orifice union 8, as the term suggests, it is that can to regulate fuel-economizing mouth voluntarily big for the pressure height according to internal system
Little and keep a kind of Intelligent throttle valve of constant flow, fluid moment can be stoped to flow through in a large number, current limliting speed limit, prevent accident
Fall.
Overflow assemblies 16, can be opened unloaded back by reliably working, once system pressure superelevation under presetting safe pressure immediately
Oil, prevents overload, protection system and vehicle from damaging from overload.
Manual reverse of direction assembly 4, not only meets liquid stream commutation change system work filling, and poppet valve core 3 is unidirectional locking
Spool is again Flow-rate adjustment spool, and the displacement changing poppet valve core 5 can change the size of backflow hydraulic fluid port, and return flow
The most relevant through hydraulic fluid port size with institute, by the regulation of poppet valve core 5, make flow and speed reach controlled purpose, the present invention ties
Structure is simple, easily manufactured.
Described pressure compensation regulating module 8 includes throttle valve body 7, throttling valve core 10, spring 9, and throttling valve core 10 is in cup
Shape, throttling valve core 10 right-hand member is provided with a choke valve axially extending bore 10.1, and throttling valve core 10 is enclosed within spring 9, choke valve
Core 10 and spring 9 coordinate in throttle valve body 7 and can do reciprocating；Throttling valve core 10 and spring 9 move back and forth and are
Referring to, spring 9 one end offsets with throttling valve core 10, and spring 9 other end is inconsistent with throttle valve body 7 inwall, at spring 9
Effect under can realize reset function；The choke valve axially extending bore 10.1 of throttling valve core 10 right-hand member is with ejection assembly 11 even
Logical；Throttle valve body 7 wall is provided with the throttle orifice d intersected with throttling valve core 10 direction of motion, throttle orifice d and manual reverse of direction group
Part 4 connects.
Described throttle valve body 7 left end forms the 4th fluid chamber e, and described throttle valve body 7 right-hand member forms the 5th fluid chamber f.
Described manual reverse of direction assembly 4, includes left valve barrel 6, cone valve spring 3, poppet valve core 5, middle valve body the most successively
2, steel ball 17, right valve barrel 15, valve rod spring 13, valve rod 14, arrange in same axis, cone valve spring 3, poppet valve core 5
Forming one group of check valve with left valve barrel 6, middle valve body 2, steel ball 17 form another group check valve, right valve barrel 15, valve rod bullet
Spring 13, valve rod 14 composition control mechanism；The cone small end of poppet valve core 5 and steel ball 17 are respectively positioned in middle valve body 2；Poppet valve core
5 and steel ball 17 being turned on and off of valve body about 2 two ends in controlling；Valve rod 14 is used for promoting steel ball 17 to move；In
Valve body 2 is internally formed the second fluid chamber b, the second fluid chamber b and connects with Manpowered pump 1.
It is provided with stroke gap between described steel ball 17 and valve rod 14.Described gap B, C as shown in Figure 12 point
Distance between instruction.Described B, C two indicates the distance between point to specify the most voluntarily.
Described overflow assemblies 16 is ball direct acting type overflow valve, is followed successively by overflow ball 16.3, overflow spring from left to right
16.2, the ball direct acting type overflow valve of micrometer adjusting screw 16.1 composition, front portion is overflow ball 16.3, and middle part is overflow spring 16.2,
Overflow ball 16.3 is made to be close on valve body sealing surface the most all the time and in sealing state, overflow spring 16.2 afterbody is provided with tune
The micrometer adjusting screw 16.1 of joint pressure.By regulating the position of micrometer adjusting screw 16.1, change the balance of overflow spring 16.2 in valve
Power, thus set the value opening pressure.
Described Manpowered pump 1 is single pole or the reciprocating single-acting pump of double-rod.Oil extraction time under Manpower, the spring at Manpowered pump 1
Drive pump rod reset time oil suction, it is a stroke that pump rod makes a round trip, and arrange, oil suction once, its force form be preferably
Hands is pulled, foot-operated two-in-one mechanism, it is also possible to be to use single hand-operated mechanism, it is also possible to be single footstep mechanism.
Described Manpowered pump 1 form of exerting a force is that hands is pulled, ridden two-in-one mechanism.
Described ejection assembly 11 is oil cylinder, and described cylinder structure is plunger type or piston type.
The operation principle of the present invention is:
One, hoist process:
1, under original state, valve rod 14 resets under the effect of its valve rod spring 13, and left end is in B location, and premise is
Non-contravention steel ball 17, when Manpowered pump 1 makees oil suction operating mode, forms negative pressure in the second fluid chamber b, poppet valve core 5 is at its cone valve
Being closed under spring 3 effect, and steel ball 17 automatically opens up due to suction function, hydraulic oil flows through from accumulator 12
First fluid chamber a, then through the second fluid chamber b, finally suck in Manpowered pump 1, complete oil-absorbing process.
2, when Manpowered pump 1 makees oil extraction operating mode, the second fluid chamber b pressure raises, and is promoted steel ball 17 by forward hydraulic oil
Moving to right until closing, and poppet valve core 5 is open, hydraulic oil flow enters the 3rd fluid chamber c, then through throttle orifice d, the 4th oil
Sap cavity e, choke valve axially extending bore 10.1 and the 5th fluid chamber f, be finally delivered in ejection assembly 11 (oil cylinder), make top
Going out assembly 11 (oil cylinder) to hoist motion, thus drive external loading to rise together, this crosses intermediate range throttling valve core 10 by bullet
Be close to the right under spring and liquid stream double acting, then d fuel-economizing hole is shown in a fully open operation, without throttling action, due to match
Being Manpowered pump 1, discharge oil mass is few, then choke valve axially extending bore 10.1 works under being in less flow, the most not playing throttling and making
With.
Two, tentative process:
Promoting valve rod 14 in the direction of arrows, when left end is in location of C, the most micro-shifting of steel ball 17 also leaves the steel ball of middle valve
Sealing surface, but do not touch poppet valve core 5, now the first fluid chamber a, the second b bis-chamber, fluid chamber communicate, so that manpower
Pump 1 communicates with accumulator 12, and the hydraulic oil that Manpowered pump 1 sucks is drained back to accumulator 12, simultaneously cone valve by Manpowered pump 1 again
Core 5 is still in closing lock status under the effect of cone valve spring 3, and ejection assembly 11 (oil cylinder) interior hydraulic pressure oil mass does not increases
Subtract, then ejection assembly 11 (oil cylinder) attonity, and make external loading also keep resting state.
Three, decline and speed is controlled
Continue to press on valve rod 14 by the direction of arrow in figure, left end prop up steel ball 17 and promote steel ball 17 to continue to be moved to the left until
Touching the right-hand member of poppet valve core 5, now poppet valve core 5 is opened, and ejection assembly 11 (oil cylinder) is in the effect of external loading potential energy
Under do return motion, the hydraulic oil in its ejection assembly 11 (oil cylinder) through the 5th fluid chamber f, choke valve axially extending bore 10.1,
4th fluid chamber e, throttle orifice d, the 3rd fluid chamber c, the second fluid chamber b, the first fluid chamber a flow back into accumulator 12,
Complete decline process.
Decrease speed is to open relevant with displacement to the left with poppet valve core 5, and namely displacement is the most, then hydraulic fluid port is also big, stream
Measuring the most, speed is the fastest, and vice versa, and the displacement of poppet valve core 5 can be by the bit shift of manual control valve rod 14
Put and reach.
Four, falling proof device
Automatic speed-limiting is to be automatically performed by pressure compensation regulating module 8, pressure compensation regulating module 8 by throttling valve core 10 with
Spring 9 forms, and the 5th fluid chamber f directly communicates with ejection assembly 11 (oil cylinder), and in ejection assembly 11 (oil cylinder)
Pressure size determined by external loading size, during oil return, choke valve axially extending bore 10.1 both sides will occur pressure
Difference, thus promote throttling valve core 10 to move to left, promote throttle orifice d to diminish, flow velocity is slack-off, then is fed back to the 4th fluid chamber e
With the 5th f two chamber, fluid chamber, then the power on throttling valve core 10 both sides produces new equilibrium point, makes throttling valve core 10 keep working as
Front position relatively, the area of throttle orifice d is also stabilized in appropriately sized simultaneously, and displacement and hydraulic fluid port no longer change, so that
Flow constant is constant and is not affected by load weight or pressure size, under finally making ejection assembly 11 (oil cylinder) make slowly
Fall motion and speed keep invariable, prevent the possibility of dramatic decrease, reach fall arrest purpose.
Five, overload protection:
When goods overloads, the pressure in ejection assembly 11 (oil cylinder) also increases, in system oil-way makes the 3rd fluid chamber c
Pressure also increases, and the active force acting on poppet valve core 5 back side also increases, and inputs the second fluid chamber b when Manpowered pump 1 works
The insufficient pressure produced, to push poppet valve core 5 open, but overcomes overflow ball 16.3 back overflow spring 16.2 in overflow assemblies 16
Active force, then overflow ball 16.3 leaves valve body sealing surface, makes overflow assemblies 16 open, and hydraulic oil is through the first fluid chamber
A is back to accumulator 12, reaches system protection purpose, and the big I of protection domain is by the micrometer adjusting screw 16.1 in overflow assemblies 16
It is set and regulates.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.To this
The multiple amendment of a little embodiments will be apparent from for those skilled in the art, as defined herein typically
In the case of principle can be in without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention
Will not be limited to the embodiments shown herein, and be intended to accord with principles disclosed herein and features of novelty is consistent
The widest scope.
Claims (10)
1. a manual forklift hydraulic safe system, including Manpowered pump (1), accumulator (12), ejection assembly (11),
Also include preventing unexpected generation and pressure compensation regulating module (8) that moment falls, possess latch functions and regulation liquid stream
Direction changes the manual reverse of direction assembly (4) of system health and prevents the overflow assemblies (16) of overload；Described pressure
Compensator control assembly (8) connects with ejection assembly (11) and manual reverse of direction assembly (4) respectively；Described Manpowered pump (1)
Connect with manual reverse of direction assembly (4) and overflow assemblies (16) respectively, overflow assemblies (16) and manual reverse of direction assembly (4)
Connection.
Manual forklift hydraulic safe system the most according to claim 1, it is characterised in that: described pressure is mended
Repay regulating module (8) and include throttle valve body (7), throttling valve core (10), spring (9), throttling valve core (10)
Cup-shaped, throttling valve core (10) right-hand member is provided with a choke valve axially extending bore (10.1), and throttling valve core (10) is enclosed within
On spring (9), throttling valve core (10) and spring (9) coordinate in throttle valve body (7) and can do reciprocating；
The choke valve axially extending bore (10.1) of throttling valve core (10) right-hand member connects with ejection assembly (11)；Throttle valve body (7)
Wall is provided with the throttle orifice (d) intersected with throttling valve core (10) direction of motion, throttle orifice (d) and manual reverse of direction assembly
(4) connection.
Manual forklift hydraulic safe system the most according to claim 2, it is characterised in that: described throttle valve body
(7) left end forms the 4th fluid chamber (e), and described throttle valve body (7) right-hand member forms the 5th fluid chamber (f).
Manual forklift hydraulic safe system the most according to claim 1, it is characterised in that: described manually changes
To assembly (4), include left valve barrel (6), cone valve spring (3), poppet valve core (5), middle valve body the most successively
(2), steel ball (17), right valve barrel (15), valve rod spring (13), valve rod (14), arrange in same axis,
Cone valve spring (3), poppet valve core (5) and left valve barrel (6) form one group of check valve, middle valve body (2), steel ball (17)
Form another group check valve, right valve barrel (15), valve rod spring (13), valve rod (14) composition control mechanism；Cone valve
The cone small end of core (5) and steel ball (17) are respectively positioned in middle valve body (2)；Poppet valve core (5) and steel ball (17) are used
In controlling, valve body (2) two ends, left and right is turned on and off；Valve rod (14) is used for promoting steel ball (17) to move；In
Valve body (2) is internally formed the second fluid chamber (b), and the second fluid chamber (b) connects with Manpowered pump (1).
Manual forklift hydraulic safe system the most according to claim 4, it is characterised in that: described steel ball (17)
And it is provided with stroke gap between valve rod (14).
Manual forklift hydraulic safe system the most according to claim 1, it is characterised in that: described overflow group
Part (16) is ball direct acting type overflow valve.
Manual forklift hydraulic safe system the most according to claim 6, it is characterised in that: described overflow valve
Valve body front portion be overflow ball (16.3), middle part is overflow spring (16.2), afterbody be provided with regulation pressure fine setting spiral shell
Nail (16.1).
Manual forklift hydraulic safe system the most according to claim 7, it is characterised in that: described Manpowered pump
(1) it is single pole or the reciprocating single-acting pump of double-rod.
9. according to the manual forklift hydraulic safe system described in claim 6,7,8 any one, it is characterised in that:
Described Manpowered pump (1) force form is that hands is pulled, ridden two-in-one mechanism, or individually hands trigger structure, or individually rides
Mechanism.
Manual forklift hydraulic safe system the most according to claim 1, it is characterised in that: described ejects group
Part (11) is oil cylinder, and described cylinder structure is plunger type or piston type.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108004.1A CN103848374B (en) | 2014-03-19 | 2014-03-19 | Manual forklift hydraulic safe system |
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|---|---|---|---|
| CN201410108004.1A CN103848374B (en) | 2014-03-19 | 2014-03-19 | Manual forklift hydraulic safe system |
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| CN103848374B true CN103848374B (en) | 2016-08-17 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105819374B (en) * | 2016-06-03 | 2019-03-29 | 宁海佰成机械有限公司 | Tray carriage hydraulic device |
| CN108679028A (en) * | 2018-08-15 | 2018-10-19 | 罗弦 | A kind of hydraulic power unit valve block structure and hydraulic power unit and the fork truck of application |
| CN111547648B (en) * | 2020-04-24 | 2024-05-03 | 安徽合力股份有限公司 | Hydraulic system for load maintenance of stacker |
| CN112875456B (en) * | 2021-01-26 | 2022-07-01 | 重庆大学 | Self-adaptive buffer hydraulic speed-limiting cutting device, system and method |
| CN114030595A (en) * | 2021-11-18 | 2022-02-11 | 庆安集团有限公司 | Time-controllable differential motion actuating device |
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| CN202144431U (en) * | 2011-06-28 | 2012-02-15 | 杭州天恒机械有限公司 | Load slow-releasing oil pump loop being not affected by load for hydraulic jack |
| CN202175515U (en) * | 2011-07-18 | 2012-03-28 | 江苏春兰机械制造有限公司 | Anti-falling device of lifting mechanism |
| CN202912624U (en) * | 2012-11-02 | 2013-05-01 | Mvp(香港)工业有限公司 | Safe slow-descent lifting jack during heavy pressure |
| CN103332630A (en) * | 2013-07-23 | 2013-10-02 | 常熟通润汽车零部件股份有限公司 | Hydraulic jack with automatic speed regulation function |
| CN203740973U (en) * | 2014-03-19 | 2014-07-30 | 宁海佰成机械有限公司 | Hydraulic safety system of manual fork truck |
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| CN103848374A (en) | 2014-06-11 |
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