CN103899585A - Hydraulic control system with two oil cylinders performing orderly telescopic motion, suspension arm mechanism and crane - Google Patents
Hydraulic control system with two oil cylinders performing orderly telescopic motion, suspension arm mechanism and crane Download PDFInfo
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- CN103899585A CN103899585A CN201410075934.1A CN201410075934A CN103899585A CN 103899585 A CN103899585 A CN 103899585A CN 201410075934 A CN201410075934 A CN 201410075934A CN 103899585 A CN103899585 A CN 103899585A
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Abstract
The invention discloses a hydraulic control system with two oil cylinders performing orderly telescopic motion, a suspension arm mechanism and a crane. A first working oil port of a telescopic control unit is communicated with a first working oil port of a stroke reversing valve, and a second working oil port of the stroke reversing valve is communicated with a rodless cavity of a first telescopic oil cylinder. A second working oil port of the telescopic control unit is communicated with a rod cavity of the first telescopic oil cylinder, a rod cavity of a second telescopic oil cylinder is communicated with the rod cavity of the first telescopic oil cylinder, and a rodless cavity of the second telescopic oil cylinder is communicated with an oil path between the telescopic control unit and the stroke reversing valve. The stroke reversing valve is arranged on a piston rod of the second telescopic oil cylinder, and a trigger mechanism is arranged on a body of the second telescopic oil cylinder. By means of the hydraulic control system, the suspension arm mechanism and the crane, stability of movement of the two oil cylinders can be improved, pressure requirements of no-load retraction can be met, orderly telescopic motion of the two cylinders depends on mechanical control, reliability is high, and the advantages of being good in manufacturability, high in reliability, low in cost, easy to arrange and the like can be obtained.
Description
Technical field
The present invention relates to technical field of engineering machinery, relate in particular to hydraulic control system, suspension arm mechanism and the hoist of a kind of pair of oil cylinder sequential telescopic.
Background technique
Lorry-mounted crane is to be arranged on automobile chassis in one, integrates handling and the many actions Hoisting Machinery transporting.Arm is as the topmost mechanism of lorry-mounted crane, and its effect is support loads, and changes jib length by extending means, to obtain the effect amplitude, lifting altitude or the lifting weight that need.The flexible order of arm directly affects arm deadweight, arm position of centre of gravity and the functioning efficiency of hoist, and then affects overall performance.The arm of lorry-mounted crane have changing load, operating rate change frequent, impact shock greatly, longevity of service and band carry the operating feature such as stretch.Meanwhile, the sectional dimension of straight-arm suspension arm of lorry-mounted crane is less, and the layout of extending means is the problem of can not ignore with maintenance, requires simple, compact, reliable.Therefore, hoisting arm expansion technology is the key technology that determines lorry-mounted crane development.At present, the hoisting arm expansion of the lorry-mounted crane on market mostly is synchronization telescope, respectively saves telescopic boom and completes in certain sequence and stretch out and retract action.Straight-arm lorry-mounted crane arm body section is less, carries flexible demand for meeting market lorry-mounted crane band, and straight-arm lorry-mounted crane telescopic hydraulic cylinder number that can be flexible under heavier load behavior is generally two.
Patent CN201020513227.3, CN201020513260.6 and CN201110088610.8 have proposed the arm synchronous telescopic system of the many parbuckles of lorry-mounted crane single cylinder band, have that compact structure, jib are light, working efficiency advantages of higher, but Cable forces is severe in the time that band year stretches, easily rupture, be not suitable for the straight-arm lorry-mounted crane of large-tonnage, single oil cylinder.
The large-tonnage straight-arm lorry-mounted crane double-cylinder stay cable arm body expansion device that patent CN201110047816.6 proposes, its working principle is: the first telescopic oil cylinder drives two joint arms flexible, and the second telescopic oil cylinder drives three, four, five, six joint arm synchronization telescopes by stayed structure.This patent can meet changeable lifting weight and the requirement of operating rate, but has only proposed the implementation method of mechanical structure, does not provide the implementation method of twin-tub sequential telescopic.
The suspension arm sequential stretching/retracting hydraulic system that patent CN201010605795.0 proposes, its working principle is: order is stretched the function of hydraulic control of dependence machine liquid selector valve, only has and reaches behind position when arm body, and pressure rise, opens machine liquid selector valve, and pressure oil enters next stage oil cylinder; What order contracting relied on is the machine control function of machine liquid selector valve, after arm body is retracted, and the position limit switch on collision block impact machine liquid selector valve, pressure oil enters upper level oil cylinder.This patent has adopted special machine liquid selector valve, has two kinds of open methods of fluid control pressure and position limit switch, is respectively used to control stretch out and retract.There are a lot of shortcomings in this machine liquid selector valve, as complex structure, cost is high, reliability is low etc., particularly its function of hydraulic control has limited the application area of this patent: the pilot pressure of the machine liquid selector valve that next stage arm is used must be than the height of upper level, for avoiding system pressure too high, be not therefore suitable for the too much lorry-mounted crane of arm joint number; In the time that lifting weight is larger, the pressure that load produces may exceed the cracking pressure of selector valve, causes selector valve surprisingly to be opened, thereby is communicated with oil path in oil cylinders at different levels, is not therefore suitable for large-tonnage or has band to carry the flexible lorry-mounted crane requiring.In the piston rod of the oil cylinder of this belt carcass pipe, establish three oil ducts, have complex structure, size is large, reliability is low and cost is high determines.In addition,, in the order initial LAP scope of stretching, oil cylinder great Qiang at different levels UNICOM, stretches out order uncontrollable.
The single oil cylinder sequential telescopic system that patent US5501346 and patent ES2085045T3 propose, adopt special oil cylinder, when order is stretched, in the time that piston movement arrives top, utilize oil hydraulic cylinder core tube end circumferentially to have symmetrical logical hydraulic fluid port, the large chamber of oil hydraulic cylinder can be communicated with piston rod oil duct, and pressure oil enters next stage oil hydraulic cylinder; When order contracting, in the time that piston movement arrives bottom, trigger position limit switch, the large chamber of oil hydraulic cylinder can enter upper level oil hydraulic cylinder by machine control one-way valve.Because all relying on machinery, the switching of sequential telescopic triggers therefore reliable in action.But adopted the oil hydraulic cylinder of special manufacture, its complex structure, versatility is poor, cost is high, maintainable low, be not suitable for the built-in straight-arm lorry-mounted crane of oil hydraulic cylinder.
The single oil cylinder sequential telescopic system that patent US5518129A proposes, it is the triggering that relies on servomotor driven change valve that its order is stretched, its order contracting is the triggering that relies on the motor-driven one-way valve of oil hydraulic cylinder bottom.Compared with patent US5501346, cancel core pipe, redesign the machine control one-way valve of oil cylinder bottom, greatly simplify hydraulic cylinder structure, but oil hydraulic cylinder still needs special manufacture, and need to increase the arrangement of hose reel for the large chamber of afterbody oil hydraulic cylinder return tube, be applicable to the folding arm lorry-mounted crane that installing space is large.
The flexible technology of single oil cylinder that patent DE3806390A1 proposes, the automatically controlled cartridge valve adopting is controlled respectively the break-make of the large chamber of each oil hydraulic cylinder oil duct, can realize sequential telescopic by the break-make order of solenoid valve is set, but also exist oil hydraulic cylinder to need special, solenoid valve reliability ground, need the shortcomings such as extension wire reel.
The hydraulic system of two oil cylinder sequential telescopics of a kind of control that patent CN201818571U proposes, be characterized in two selector valves and two equilibrium valves, control respectively two oil hydraulic cylinders, principle is simple, but complicated operation, number of elements is more, versatility is poor, as is applied to straight-arm lorry-mounted crane, needs extra hose reel or the flexible pipe guide chain of increasing, installation dimension is large, causes arm cross section to increase.
The shortcomings such as along with the development of market, technology, twin-tub completes hoisting arm expansion technology becomes the trend of development, and still, the hydraulic control system of existing pair of oil cylinder sequential telescopic has complex structure, cost is high, reliability is low, versatility is poor, maintainability is low.
Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide the hydraulic control system of a kind of pair of oil cylinder sequential telescopic, can control suspension arm mechanism sequential telescopic.
A hydraulic control system for pair oil cylinder sequential telescopic, comprising: for switching extension and contraction control connection, the first telescopic oil cylinder, the second telescopic oil cylinder, return of stroke valve and the trigger mechanism of pressure oil direction; The first actuator port of described extension and contraction control connection is communicated with the first actuator port of described return of stroke valve, and the second actuator port of described return of stroke valve is communicated with the rodless cavity of described the first telescopic oil cylinder; The second actuator port of described extension and contraction control connection is communicated with the rod chamber of described the first telescopic oil cylinder, the rod chamber of described the second telescopic oil cylinder is communicated with the rod chamber of described the first telescopic oil cylinder, and the rodless cavity of described the second telescopic oil cylinder is communicated with the oil circuit between described extension and contraction control connection and described return of stroke valve; Described return of stroke valve is arranged on the piston rod of the second telescopic oil cylinder, and described trigger mechanism is arranged on the cylinder body of described the second telescopic oil cylinder; Described return of stroke valve is realized working position switching by contacting with described trigger mechanism.
According to one embodiment of present invention, further, described the first telescopic oil cylinder comprises: core pipe, first piston bar and the first cylinder body; Described first piston bar comprises bar section and seal section, in the bar section of described first piston bar, is provided with a cavity; One end of described core pipe is fixedly installed on the cylinder bottom of described the first cylinder body, and is communicated with the first actuator port of described return of stroke valve; The other end of described core pipe is through the seal section of described first piston bar, is positioned at the cavity of bar section of described first piston bar the first actuator port joining with described extension and contraction control and is communicated with; In the bar section of described first piston bar, be provided with the first rod chamber oil duct, one end of described the first rod chamber oil duct is communicated with the second actuator port of described extension and contraction control connection, and the other end of described the first rod chamber oil duct is communicated with the rod chamber of described the first telescopic oil cylinder.
According to one embodiment of present invention, further, described the second telescopic oil cylinder comprises: the second piston rod and the second cylinder body; Described the second piston rod comprises bar section and seal section; In the bar section of described the second piston rod, be provided with the second rod chamber oil duct, one end of described the second rod chamber oil duct is communicated with the rod chamber of described the first telescopic oil cylinder by oil pipe, and the other end of described the second rod chamber oil duct is communicated with the rod chamber of described the second telescopic oil cylinder; In described the second piston rod, be provided with the second rodless cavity oil duct, one end of described the second rodless cavity oil duct is communicated with the oil circuit between described core pipe and described return of stroke valve by oil pipe, and the other end of described the second rodless cavity oil duct is communicated with the rodless cavity of described the second telescopic oil cylinder.
According to one embodiment of present invention, further, described extension and contraction control connection comprises: selector valve; Described selector valve comprises pressure hydraulic fluid port, return opening, the first actuator port, the second actuator port and meta return opening, and described selector valve has the first working position, the second working position and the 3rd working position; Described selector valve is in the time of the first working position, the pressure hydraulic fluid port of described selector valve, return opening, the first actuator port, the second actuator port are not all communicated with each other, and the pressure oil entering by the pressure hydraulic fluid port of described selector valve is by the meta return opening oil sump tank of described selector valve; Described selector valve is in the time of the second working position, and the pressure hydraulic fluid port of described selector valve is communicated with the first actuator port of described selector valve, and the return opening of described selector valve is communicated with the second actuator port of described selector valve; Described selector valve is in the time of the 3rd working position, and the pressure hydraulic fluid port of described selector valve is communicated with the second actuator port of described selector valve, and the return opening of described selector valve is communicated with the first actuator port of described selector valve; The pressure hydraulic fluid port of described selector valve is communicated with in-line, the return opening of described selector valve is communicated with fuel tank, the first actuator port of described selector valve described core pipe built-in with described the first telescopic oil cylinder is communicated with, and the second actuator port of described selector valve is communicated with the rod chamber of described the first telescopic oil cylinder.
According to one embodiment of present invention, further, on the oil circuit being communicated with described core pipe at the first actuator port of described selector valve, side is connected to level relief valve first time, and the oil outlet of described first level relief valve is communicated with fuel tank.
According to one embodiment of present invention, further, on the oil circuit being communicated with the rod chamber of described the first telescopic oil cylinder at the second actuator port of described selector valve, side is connected to second subprime relief valve, and the oil outlet of described second subprime relief valve is communicated with fuel tank.
According to one embodiment of present invention, further, on the oil circuit between described extension and contraction control connection and described the first telescopic oil cylinder, equilibrium valve is set.
According to one embodiment of present invention, further, described equilibrium valve comprises the first actuator port, the second actuator port, the 3rd actuator port, the 4th actuator port; The first actuator port of described equilibrium valve is communicated with the first actuator port of described extension and contraction control connection, the second actuator port of described equilibrium valve is communicated with the second actuator port of described extension and contraction control connection, the 3rd actuator port of the described equilibrium valve described core pipe built-in with described the first telescopic oil cylinder is communicated with, and the 4th actuator port of described equilibrium valve is communicated with the rod chamber of the first telescopic oil cylinder.
A kind of suspension arm mechanism, comprises fixed arm and at least two joint telescopic booms, also comprises: the hydraulic control system of as above pair of oil cylinder sequential telescopic; The piston rod of the first telescopic oil cylinder of the hydraulic control system of described pair of oil cylinder sequential telescopic is fixedly connected with described fixed arm, the cylinder body of described the first telescopic oil cylinder is fixedly connected with first segment telescopic boom, the piston rod of the second telescopic oil cylinder of the hydraulic control system of described pair of oil cylinder sequential telescopic is fixedly connected with described first segment telescopic boom, and the cylinder body of described the second telescopic oil cylinder is fixedly connected with second section telescopic boom; Described the first telescopic oil cylinder drives described first segment telescopic boom stretch out and retract; Described the second telescopic oil cylinder stretches out drawing cable mechanism by many groups and retraction drawing cable mechanism drives described second section telescopic boom and telescopic boom more than described second section telescopic boom stretch out and retract.
A kind of hoist, comprises suspension arm mechanism as above.
Hydraulic control system, suspension arm mechanism and the hoist of of the present invention pair of oil cylinder sequential telescopic, can improve the stationarity of two cylinder movements, reduce energy consumption, can meet again unloaded pressure demand of retracting simultaneously, the sequential telescopic of twin-tub relies on machinery to control, principle is simple, reliability is high, thereby has ensured that hoist performance brings into play better, and there is good manufacturability, reliability is high, cost is low, be easy to the features such as layout.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is according to the hydraulic control system of of the present invention pair of oil cylinder sequential telescopic embodiment's schematic diagram;
Fig. 2 is according to boom structure of the present invention embodiment's schematic diagram;
Wherein: 1-extension and contraction control connection; 11-one-way valve; 12-arm selector valve; The secondary relief valve of 13-A side; The secondary relief valve of 14-B side;
2-one-way balance valve; 21-the first sequence valve; 22-the second one-way valve; 23-throttle valve;
3-the first telescopic oil cylinder; 31-first piston bar; 32-the first rod chamber oil duct; 33-core pipe; 34-core pipe oil duct; 35-the first rod chamber; 36-the first rodless cavity; 37-the first cylinder body;
4-the second telescopic oil cylinder; 41-the second piston rod; 42-the second rod chamber; 43-the second rod chamber oil duct; 44-the second rodless cavity oil duct; 45-the second rodless cavity; 46-the second cylinder body;
5-return of stroke valve; 6-trigger mechanism; The 7-drag-line that bounces back; First group of 8-stretches out drag-line; Second group of 9-stretches out drag-line;
I-first segment arm; II-second section arm; Tri-sections of arms of III-; Tetra-sections of arms of IV-; Five sections of arms of V-;
P-pressure hydraulic fluid port; T-return opening; A, B-actuator port;
The end hydraulic fluid port of A1, B1-first piston bar; A2-core pipe hydraulic fluid port; The rod chamber hydraulic fluid port of B2-first piston bar; The hydraulic fluid port of A3, B3-the first cylinder body;
The end hydraulic fluid port of B4, A4, A6-the second piston rod; The rodless cavity hydraulic fluid port of A5-the second piston rod; The rod chamber hydraulic fluid port of B5-the second piston rod; The hydraulic fluid port of A7, A8-return of stroke valve.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
" first ", " second " etc. in the present invention distinguishes on describing, not other special implication.
As shown in Figure 1, the hydraulic control system of two oil cylinder sequential telescopics comprises: for switching extension and contraction control connection 1, the first telescopic oil cylinder 3, the second telescopic oil cylinder 4, return of stroke valve 5 and the trigger mechanism 6 of pressure oil direction.
Extension and contraction control connection 1 has the first actuator port and the second actuator port, and the first actuator port of extension and contraction control connection 1 is communicated with the first actuator port of return of stroke valve 5, and the second actuator port of return of stroke valve 5 is communicated with the rodless cavity of the first telescopic oil cylinder 3.The second actuator port of extension and contraction control connection 1 is communicated with the rod chamber of the first telescopic oil cylinder 3, the rod chamber of the second telescopic oil cylinder 4 is communicated with the rod chamber of the first telescopic oil cylinder 3, and the rodless cavity of the second telescopic oil cylinder 4 is communicated with the oil circuit between the first telescopic oil cylinder 3 and return of stroke valve 5.
Return of stroke valve 5 is arranged on the piston rod of the second telescopic oil cylinder 4, and trigger mechanism 6 is arranged on the cylinder body of the second telescopic oil cylinder 4.Return of stroke valve 5 is realized working position switching by contacting with trigger mechanism.
According to one embodiment of present invention, the first telescopic oil cylinder 3 comprises: core pipe 33, first piston bar 31 and the first cylinder body 37.First piston bar 31 comprises bar section and seal section, in the bar section of first piston bar 31, is provided with a cavity.One end of core pipe 33 is fixedly installed on the cylinder bottom of the first cylinder body 37, and is communicated with the first actuator port of return of stroke valve 5.The other end of core pipe 33 is through the seal section of first piston bar 31, be positioned at first piston bar bar section cavity and join the first actuator port of 1 with extension and contraction control and be communicated with.The one end that is provided with the first rod chamber oil duct 32, the first rod chamber oil ducts 32 in the bar section of first piston bar 31 is communicated with the second actuator port of extension and contraction control connection 1, and the other end of the first rod chamber oil duct 32 is communicated with the rod chamber of the first telescopic oil cylinder 31.
According to one embodiment of present invention, the second telescopic oil cylinder 4 comprises: the second piston rod 41 and the second cylinder body 46.The second piston rod 41 comprises bar section and seal section, in the bar section of the second piston rod, be provided with the second rod chamber oil duct 43, one end of the second rod chamber oil duct 43 is communicated with the first rod chamber 35 of the first telescopic oil cylinder by oil pipe, and the other end of the second rod chamber oil duct 43 is communicated with the second rod chamber 42 of the second telescopic oil cylinder; The one end that is provided with the second rodless cavity oil duct 44, the second rodless cavity oil ducts 44 in the second piston rod 41 is communicated with the oil circuit between core pipe 33 and return of stroke valve 5 by oil pipe, and the other end of the second rodless cavity oil duct 44 is communicated with the second rodless cavity 45 of the second telescopic oil cylinder.
The hydraulic control system of of the present invention pair of oil cylinder sequential telescopic, comprises the first telescopic oil cylinder, the second telescopic oil cylinder, return of stroke valve and the trigger mechanism of extension and contraction control connection with two secondary relief valves, equilibrium valve, built-in core pipe.Return of stroke valve is screwed the second piston rod end at the second telescopic oil cylinder, and trigger architecture is fixed on the end of the second cylinder body of the second telescopic oil cylinder, the setting corresponding with trigger mechanism of return of stroke valve.
As shown in Figure 1, the first telescopic oil cylinder 3 is the structural type of belt carcass pipe, and is provided with hydraulic fluid port A1, B1, A2, B2, A3, B3 and the first rod chamber oil duct 32, core pipe oil duct 34.First piston bar 31 is sleeved in the first cylinder body 37, and the inner chamber of cylinder body 37 is divided into the first rod chamber 35 and first rodless cavity 36 two-part.
Core pipe 33 can be made up of seamless steel pipe, and its one end is sleeved in the cavity of first piston bar 31 inside, and the other end is fixed on the bottom of the first cylinder body 37.The fore and aft motion that core pipe 33 can be followed the first cylinder body 37 is free to slide in first piston bar 31.Because the end face of core pipe 33 bears the longitudinal pressure of fluid all the time, in order to avoid, oil liquid pressure is excessive causes 33 longitudinal bendings of core pipe to damage, and at extension and contraction control connection 1, the secondary relief valve 13 of A side is set, and the fluid maximum pressure in core pipe 33 is limited.
Hydraulic fluid port B1, A1 are arranged on the end of first piston bar 31, hydraulic fluid port B2 is arranged on rod chamber one end of first piston bar 31, hydraulic fluid port B3 is arranged on the end of the first cylinder body 37, and hydraulic fluid port A2 is arranged on the joint of core pipe 33 and cylinder body 37, and hydraulic fluid port A3 is arranged on the bottom of the first cylinder body 37.Between B1 and B2, form the first rod chamber oil duct 32, between A1 and A2, form core pipe oil duct 34.For preventing string oil between core pipe oil duct 34 and the first rodless cavity 36, be provided with seal arrangement in core pipe 33 and the contacting point of first piston bar 31.
The second telescopic oil cylinder 4 is provided with hydraulic fluid port A4, A5, A6, B4, B5 and the second rod chamber oil duct 43, the second rodless cavity oil duct 44.The second piston rod 42 is sleeved in the second cylinder body 47, and the inner chamber of cylinder body 47 is divided into the second rod chamber 43 and second rodless cavity 46 two-part.The end sides of the second piston rod 41 is provided with return of stroke valve 5.The end of the second cylinder body 46 is provided with trigger mechanism 6.
Hydraulic fluid port B4, A4 and A6 are arranged on the end sides of the second piston rod 41, and B5 is arranged on rod chamber one end of the second piston rod 41, and A5 is arranged on the bottom of the second piston rod 41.Between B4 and B5, form the second rod chamber oil duct 43.Then and between A5, form the second rodless cavity oil duct 44 A4 is directly communicated with A6.
Return of stroke valve 5 is gasket mounted return of stroke valve, is directly installed on the end sides of the second piston rod 41, and is provided with hydraulic fluid port A7, A8.A7 is arranged on return of stroke valve 5 bottoms, is directly communicated with A6, and therefore, the pipeline between return of stroke valve 5 and the second telescopic oil cylinder 4 is without pipeline.A8 is arranged on the top of return of stroke valve 5, is communicated with A3 by pipeline.
Trigger mechanism 6 is installed on the end of the second cylinder body 47.It is by trigger mechanism 6, the mechanical collision of return of stroke valve 5 to be realized that the working position of return of stroke valve 5 switches.Return of stroke valve 5 is fixed on the end of the second piston rod 41, and trigger mechanism 6 is fixed on the end of the second cylinder body 46, and return of stroke valve 5 is corresponding with trigger mechanism 6.During along with the second telescopic oil cylinder 4 fore and aft motion, the corresponding change of relative position of return of stroke valve 5 and trigger mechanism 6.
According to one embodiment of present invention, return of stroke valve can be called again servomotor driven change valve, and it is to promote spool with buting iron or cam to realize commutation.For example, the return of stroke valve that return of stroke valve 5 is a kind of bi-bit bi-pass, in the process of shrinking at the second piston rod 41, the buting iron of return of stroke valve 5 or cam 51 contact with trigger mechanism 6, and promotion return of stroke valve 5 spools are realized the commutation of return of stroke valve 5.Trigger mechanism 6 can be concrete according to return of stroke valve 5 commutation Demand Design, in the process of shrinking at the second piston rod 41 and under the state commutating at needs, certain part of trigger mechanism 6 and buting iron of return of stroke valve 5 or cam 51 is contacted, realize commutation.
According to one embodiment of present invention, extension and contraction control connection 1, for switching pressure oil direction, is realized the control to oil cylinder expanding-contracting action.Extension and contraction control connection 1 comprises selector valve 12.Selector valve 12 comprises pressure hydraulic fluid port P, oil return inlet T, the first actuator port A, the second actuator port B and meta return opening, and selector valve 12 has the first working position, the second working position and the 3rd working position.
Selector valve is in the time of the first working position, and the pressure hydraulic fluid port P of selector valve, oil return inlet T, the first actuator port A, the second actuator port B are not all communicated with each other, and the pressure oil entering by the pressure hydraulic fluid port 9 of selector valve 12 is by the meta return opening oil sump tank of selector valve.Selector valve 12 is in the time of the second working position, and the pressure hydraulic fluid port P of selector valve is communicated with the first actuator port A of selector valve, and the oil return inlet T of selector valve is communicated with the second actuator port B of selector valve.Selector valve is in the time of the 3rd working position, and the pressure hydraulic fluid port P of selector valve is communicated with the second actuator port B of selector valve, and the oil return inlet T of selector valve is communicated with the first actuator port A of selector valve.
The pressure hydraulic fluid port of selector valve is communicated with in-line, the oil return inlet T of selector valve is communicated with fuel tank, the first actuator port A core pipe 33 built-in with the first telescopic oil cylinder of selector valve is communicated with, and the second actuator port B of selector valve is communicated with the first rod chamber 35 of the first telescopic oil cylinder.
According to one embodiment of present invention, extension and contraction control connection 1 comprises the first one-way valve 11, the secondary relief valve 13 of A side, the secondary relief valve 14 of B side.Selector valve 12 can be three six-way transfer valves of " O " type Median Function, has a, b, tri-working positions of c, and corresponding oil cylinder stretches out, retracts and stops three kinds of actions respectively.For avoiding the excessive core pipe 33 that causes of oil liquid pressure that longitudinal bending destruction occurs, need again to ensure that oil liquid pressure enough stretches out to realize band year greatly, therefore the secondary relief valve 13 of A side is set between actuator port A and oil return inlet T.Reduce the pressure surge while retracting and utilize load deadweight to realize arm and retract for increase hydraulic system damping by overflow, thereby improve robust motion, reduce energy consumption, need again to ensure that oil liquid pressure, enough greatly to realize unloaded retraction, therefore arranges the secondary relief valve 14 of B side between actuator port B and oil return inlet T.
The pressure hydraulic fluid port P of selector valve 12 is communicated with in-line, and the first one-way valve 11 is arranged on in-line, and the oil outlet of the first one-way valve 11 is communicated with the pressure hydraulic fluid port P of selector valve 12, to prevent that fluid from flowing backwards.The oil return inlet T of selector valve 12 is communicated with fuel tank.The first actuator port A of selector valve 12 is communicated with the first actuator port C1 of equilibrium valve 2, and the second actuator port B of selector valve 12 is communicated with the second actuator port C2 of equilibrium valve 2.
On the oil circuit being communicated with the first actuator port of equilibrium valve 2 at the first actuator port A of selector valve 12, preferably side connects the secondary relief valve 13 of A side, the oil outlet of the secondary relief valve 13 of A side is communicated with fuel tank, on the oil circuit being communicated with the second actuator port of equilibrium valve 2 at the second actuator port B of selector valve 12, preferably side connects the secondary relief valve 14 of B side, and the oil outlet of the secondary relief valve 14 of B side is communicated with fuel tank.It is less that the secondary relief valve 14 of B side that the secondary relief valve 13 of A side that side connects connects with preferred side has Dimensions compared with general relief valve, the advantage that pressure flow gradient is larger.
Equilibrium valve 2 is arranged on the end of first piston bar 31, can ensure arm steadily retraction under load.The first actuator port of equilibrium valve 2 is communicated with the first actuator port A of selector valve 12, and the second actuator port of equilibrium valve 2 is communicated with the second actuator port B of selector valve 12.The 3rd actuator port of equilibrium valve 2 is directly communicated with the first actuator port A1 of the first telescopic oil cylinder 3, need not connect by pipeline.The 4th actuator port of equilibrium valve 2 is directly communicated with the second actuator port B1 of the first telescopic oil cylinder 3, need not pipeline connects, and can prevent from causing arm retraction because of leakage loss or pipeline damage.
According to one embodiment of present invention, between the first actuator port of equilibrium valve 2 and the 3rd actuator port, be provided with the first sequence valve 21 and the second one-way valve 22, the filler opening of the first sequence valve 21 is communicated with the 3rd actuator port of equilibrium valve 2, and the oil outlet of the first sequence valve 21 is communicated with the first actuator port of equilibrium valve 2.The filler opening of the second one-way valve 22 is communicated with the first actuator port of equilibrium valve 2, the oil outlet of the second one-way valve 22 is communicated with the 3rd actuator port of equilibrium valve 2, the second actuator port of equilibrium valve 2 is communicated with the 4th actuator port C4, the other throttle valve 23 that connects on the first sequence valve 21, the oil circuit between the second actuator port and the 4th actuator port of the other end connection equilibrium valve 2 of throttle valve 23.
According to one embodiment of present invention, adopt the suspension arm mechanism of this hydraulic control system, the piston rod of the first telescopic oil cylinder of hydraulic control system is fixedly connected with fixed arm, the cylinder body of the first telescopic oil cylinder is fixedly connected with first segment telescopic boom, the piston rod of the second telescopic oil cylinder of hydraulic control system is fixedly connected with first segment telescopic boom, and the cylinder body of the second telescopic oil cylinder is fixedly connected with second section telescopic boom; The first telescopic oil cylinder drives first segment telescopic boom stretch out and retract.The second telescopic oil cylinder stretches out drawing cable mechanism by many groups and retraction drawing cable mechanism drives second section telescopic boom and telescopic boom more than second section telescopic boom stretch out and retract.
As shown in Figure 2, hydraulic control system of the present invention is applied to the hoisting arm expansion mechanism of five joint arms, hoisting arm expansion mechanism comprise first segment arm I, second section arm II, Section of three arm III, Section of four arm IV, Section of five arm V, the first telescopic oil cylinder 3, the second telescopic oil cylinder 4, retraction drag-line 7, first group stretch out drag-line 8 and second group and stretch out drag-line 9.
Being installed as of the first telescopic oil cylinder: first piston bar 31 is fixedly connected with first segment arm I, the first cylinder body 37 is fixedly connected with second section arm II.Being installed as of the second telescopic oil cylinder: the second piston rod 41 is fixedly connected with second section arm II, the second cylinder body 46 is fixedly connected with Section of three arm III.Retraction drag-line 7 is connected Section of three arm III by the first telescopic oil cylinder 3, the second telescopic oil cylinder 4 with Section of five arm V, stretch out stayed structure 8 and second group in conjunction with first group and stretch out drawing cable mechanism 9, while retraction for Section of three arm III, drive Section of four arm IV, Section of five arm V synchronously to retract.
First group is stretched out drag-line 8 by second section arm II, Section of three arm III and Section of four arm IV connection, drives Section of four arm IV synchronously to stretch out for Section of three arm III while stretching out.Second group is stretched out drag-line 9 by Section of three arm III, Section of four arm IV and Section of five arm V connection, drives Section of five arm V synchronously to stretch out for Section of four arm IV while stretching out.
According to one embodiment of present invention, as illustrated in fig. 1 and 2, the hydraulic fluid port or the parts (being A and equilibrium valve 2, B and equilibrium valve 2, equilibrium valve 2 and A1, equilibrium valve 2 and B1, B2 and B4, A2 and A4, A3 and A8) that need pipeline to connect are all relative static between two.Therefore, extension and contraction control connection 1, equilibrium valve 2, the first telescopic oil cylinder 3, between the second telescopic oil cylinder 4 and return of stroke valve 5 without pipeline extension problem, between equilibrium valve 2 and the first telescopic oil cylinder 3 (between equilibrium valve 2 and A1, between equilibrium valve 2 and B1), between the first telescopic oil cylinder 3 and two telescopic oil cylinders 4 (between B2 and B4, between A2 and A4, between A3 and A8) connecting pipeline all use hard tube, and need not use the delivering oil such as reel or drag chain, have and be easy to arrange, take up room little, reliability high, be applicable to the inner installing space of straight-arm lorry-mounted crane arm little, the large structural feature of maintenance loading and unloading amount.
The working principle of the hydraulic control system of of the present invention pair of oil cylinder sequential telescopic is as shown in Figures 1 and 2, specific as follows:
1, extend action: extension and contraction control connection 1 is switched to working position a, the oil-feed of P mouth, pressure oil enters the second piston rod 41 through extension and contraction control connection 1, A, equilibrium valve 2, A1, core pipe oil duct 34, A2, A4, punishes into two oil circuits in parallel: one enters the first rodless cavity 36 through A6, A7, return of stroke valve 5, A8, A3 at the second piston rod 41; Another enters the second rodless cavity 46 through the second rodless cavity oil duct 45, A5.
The order of stretching out of twin-tub will depend on the resistance that stretches out of each cylinder.According to the extending means structural representation in Fig. 2, the first telescopic oil cylinder 3 directly drives second section arm II to stretch out, and the second telescopic oil cylinder 4 stretches out drawing cable mechanism 8 and second group by first group and stretches out drawing cable mechanism 9 and drive Section three arm III, Section of four arm IV and Section of five arm V totally three to save arms and synchronously stretch out.Known based on force analysis, the resistance to motion that the first telescopic oil cylinder 3 stretches out is load, frictional force between arm deadweight and first segment arm I and second section arm II except first segment arm I and.And first group stretched out drawing cable mechanism 8 and second group and stretch out drawing cable mechanism 9 and have and put twice effect by stressed separately, the resistance to motion that the second telescopic oil cylinder 4 stretches out be frictional force between each joint arm deadweight and each joint arm of corresponding amplification of the load of three times, corresponding amplification and.Obviously, stretch out the motionless of large the second telescopic oil cylinder 4 of resistance, stretch out the first moving of little the first telescopic oil cylinder 3 of resistance.
The difference that relies on mechanical load, first the first cylinder body 37 stretches out, and the oil return of the first rod chamber 35 is through B2, the first rod chamber oil duct 32, B1, equilibrium valve 2, B, extension and contraction control connection and T oil sump tank.If extension and contraction control connection 1 is still at working position a after the first telescopic oil cylinder 3 reaches stroke, oil liquid pressure continues to raise, overcome the resistance that stretches out of the second telescopic oil cylinder 4, the second cylinder body 46 is stretched out, and the oil return of the second rod chamber 42 is through B5, the second rod chamber oil duct 43, B4, B3, the first rod chamber 35, B2, the first rod chamber oil duct 32, B1, equilibrium valve 2, B, extension and contraction control connection 1 and T oil sump tank.Stretch out in process whole, realize pressure attributive function by A side secondary voltage limiting valve 13.Like this, twin-tub stretches out successively, drives corresponding the stretching out of each joint arm, has just completed order and has stretched.
2, retract action: extension and contraction control connection 1 is switched to working position b, the oil-feed of P mouth, pressure oil enters the second rod chamber 42 through extension and contraction control connection 1, B, equilibrium valve 2, B1, the first rod chamber oil duct 32, B2, the first rod chamber 35, B3, B4, the second rod chamber oil duct 43, B5, the oil return of the second rodless cavity 45 is through A5, the second rodless cavity oil duct 44, A4, A2, core pipe oil duct 34, A1, equilibrium valve 2, A, extension and contraction control connection 1 and T oil sump tank, and the second cylinder body 47 is retracted under the effect of pressure oil, after the second cylinder body 47 is retracted and is put in place, be fixed on the trigger mechanism 6 impact stroke selector valves 5 on the second cylinder body 47, return of stroke valve 5 is switched to right position, open the drainback passage of the first telescopic oil cylinder 3, if extension and contraction control connection 1 is still at working position b, pressure oil is through extension and contraction control connection 1, B, equilibrium valve 2, B1, the first rod chamber oil duct 32, B2 enters the first rod chamber 35, the oil return of the first rodless cavity 36 is through A3, A8, return of stroke valve 5, A7, A6, A4, A2, core pipe oil duct 34, A1, equilibrium valve 2, A, extension and contraction control connection 1 and T oil sump tank, the first cylinder body 37 is retracted under the effect of pressure oil, until retraction puts in place, stretch out in process whole, realize pressure attributive function by B side secondary voltage limiting valve 14, like this, twin-tub is retracted successively, drives the corresponding retraction of each joint arm, has just completed order contracting.
3, static carrying: extension and contraction control connection 1 is switched to working position c, the oil-feed of P mouth, fluid joins 1 and T oil sump tank by extension and contraction control, system unloaded; The first telescopic oil cylinder 3 locks under the effect of stroke selector valve 5, and the second telescopic oil cylinder 4 locks under the effect of equilibrium valve 2.
According to one embodiment of present invention, a kind of hoist, comprises suspension arm mechanism as above.This hoist not only comprises lorry-mounted crane, also comprises the hoist of other type.
The technical problem to be solved in the present invention be to provide a kind of installing space little, can be with carrying flexible and making flexible order hydraulic control system, boom structure and the hoists of the two oil cylinder sequential telescopics based on machinery control reliably.Be applied to single oil cylinder body when flexible in hydraulic control system of the present invention, the first telescopic oil cylinder only drives second section arm, the second telescopic oil cylinder stretches out drag-line in conjunction with many groups and drives Section three with synchronously the stretching out of upper arm (comprising Section three arm), and the second telescopic oil cylinder stretches out Section three of drag-line drive with the upper arm synchronous retraction of (comprising Section of three arm) in conjunction with the drag-line that bounces back, many groups.
Hydraulic control system, boom structure and the hoist of of the present invention pair of oil cylinder sequential telescopic, the following beneficial effect having:
1, at extension and contraction control connection, the secondary relief valve of A side is set, has effectively protected the first telescopic oil cylinder, avoided the longitudinal bending under too high oil liquid pressure effect of core pipe to destroy, can meet again band simultaneously and carry flexible pressure demand.
2, at extension and contraction control connection, the secondary relief valve of B side is set, can improves robust motion, reduce energy consumption, can meet again unloaded pressure demand of retracting simultaneously.
3, used twin-tub sequential telescopic band single oil cylinder to mix flexible mode: while stretching out, the first telescopic oil cylinder is stressed little, the second telescopic oil cylinder is stressed large, has ensured that the order of twin-tub is stretched; When retraction, ensured reliably to only have the second telescopic oil cylinder to retract completely by the control of return of stroke valve after the first telescopic oil cylinder can retract.Therefore, the sequential telescopic of twin-tub is to rely on machinery to control entirely, principle simply, reliably high, thereby ensured that hoist performance brings into play better.
4, the first telescopic oil cylinder is the structural type of belt carcass pipe, only has two oil ducts on first piston bar, and compared with having the oil cylinder of three oil ducts, simple in structure, good manufacturability, reliability is high, cost is low.
5, the distinctive core tubular construction of the first telescopic oil cylinder is in conjunction with return of stroke valve, make between all hydraulic fluid ports that need to connect relatively static between two, thereby avoided the problem of pipeline extension.Therefore, need not use the delivering oil such as reel or drag chain, there is the layout of being easy to, little, the reliability high that takes up room, can be widely used in the structural feature of the straight-arm lorry-mounted crane that the inner installing space of arm is little, maintenance loading and unloading amount is large.
The disclosed arbitrary technological scheme of the invention described above unless otherwise stated, if it discloses number range, so disclosed number range is preferred number range, any it should be appreciated by those skilled in the art: preferred number range is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, cannot be exhaustive, so the present invention just discloses part numerical value to illustrate technological scheme of the present invention, and the above-mentioned numerical value of enumerating should not form the restriction to the invention protection domain.
Simultaneously, if the invention described above discloses or has related to component or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can dismantle and be fixedly connected with (for example using bolt or screw to connect), also can be understood as: non-removable being fixedly connected with (for example rivet, weld), certainly, connection fastened to each other also can for example, be replaced (obviously cannot adopt except integrally formed technique) by integral type structure (use casting technique is integrally formed to be created).
In addition, in the disclosed arbitrary technological scheme of the invention described above applied for the term that represents position relationship or shape unless otherwise stated its implication comprise and its approximate, similar or approaching state or shape.Arbitrary parts provided by the invention can be both to be assembled by multiple independent constituent elements, the produced separate part of the technique that also can be one of the forming.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request protection of the present invention.
Claims (10)
1. a hydraulic control system for two oil cylinder sequential telescopics, is characterized in that, comprising:
There is the extension and contraction control connection, the first telescopic oil cylinder, the second telescopic oil cylinder, return of stroke valve and the trigger mechanism that switch pressure oil directive effect;
The first actuator port of described extension and contraction control connection is communicated with the first actuator port of described return of stroke valve, and the second actuator port of described return of stroke valve is communicated with the rodless cavity of described the first telescopic oil cylinder; The second actuator port of described extension and contraction control connection is communicated with the rod chamber of described the first telescopic oil cylinder, and the rod chamber of described the second telescopic oil cylinder is communicated with the rod chamber of described the first telescopic oil cylinder; The rodless cavity of described the second telescopic oil cylinder is communicated with the oil circuit between described extension and contraction control connection and described return of stroke valve; Described return of stroke valve is arranged on the piston rod of described the second telescopic oil cylinder, and described trigger mechanism is arranged on the cylinder body of described the second telescopic oil cylinder, and described return of stroke valve is realized working position switching by contacting with described trigger mechanism.
2. the system as claimed in claim 1, is characterized in that:
Described the first telescopic oil cylinder comprises: core pipe, first piston bar and the first cylinder body;
Described first piston bar comprises bar section and seal section; In the bar section of described first piston bar, be provided with a cavity; One end of described core pipe is fixedly installed on the cylinder bottom of described the first cylinder body and is communicated with the first actuator port of described return of stroke valve; The other end of described core pipe is through the seal section of described first piston bar, is positioned at the cavity of bar section of described first piston bar the first actuator port joining with described extension and contraction control and is communicated with;
In the bar section of described first piston bar, be provided with the first rod chamber oil duct, one end of described the first rod chamber oil duct is communicated with the second actuator port of described extension and contraction control connection, and the other end of described the first rod chamber oil duct is communicated with the rod chamber of described the first telescopic oil cylinder.
3. system as claimed in claim 2, is characterized in that:
Described the second telescopic oil cylinder comprises: the second piston rod and the second cylinder body;
Described the second piston rod comprises bar section and seal section; In the bar section of described the second piston rod, be provided with the second rod chamber oil duct, one end of described the second rod chamber oil duct is communicated with the rod chamber of described the first telescopic oil cylinder by oil pipe, and the other end of described the second rod chamber oil duct is communicated with the rod chamber of described the second telescopic oil cylinder; In described the second piston rod, be provided with the second rodless cavity oil duct, one end of described the second rodless cavity oil duct is communicated with the oil circuit between described core pipe and described return of stroke valve by oil pipe, and the other end of described the second rodless cavity oil duct is communicated with the rodless cavity of described the second telescopic oil cylinder.
4. the system as claimed in claim 1, is characterized in that:
Described extension and contraction control connection comprises: selector valve; Described selector valve comprises pressure hydraulic fluid port, return opening, the first actuator port, the second actuator port and meta return opening, and described selector valve has the first working position, the second working position and the 3rd working position;
Described selector valve is in the time of the first working position, the pressure hydraulic fluid port of described selector valve, return opening, the first actuator port, the second actuator port are not all communicated with each other, and the pressure oil entering by the pressure hydraulic fluid port of described selector valve is by the meta return opening oil sump tank of described selector valve;
Described selector valve is in the time of the second working position, and the pressure hydraulic fluid port of described selector valve is communicated with the first actuator port of described selector valve, and the return opening of described selector valve is communicated with the second actuator port of described selector valve;
Described selector valve is in the time of the 3rd working position, and the pressure hydraulic fluid port of described selector valve is communicated with the second actuator port of described selector valve, and the return opening of described selector valve is communicated with the first actuator port of described selector valve;
The pressure hydraulic fluid port of described selector valve is communicated with in-line, the return opening of described selector valve is communicated with fuel tank, the first actuator port of described selector valve described core pipe built-in with described the first telescopic oil cylinder is communicated with, and the second actuator port of described selector valve is communicated with the rod chamber of described the first telescopic oil cylinder.
5. system as claimed in claim 4, is characterized in that:
On the oil circuit being communicated with described core pipe at the first actuator port of described selector valve, side is connected to level relief valve first time, and the oil outlet of described first level relief valve is communicated with fuel tank.
6. system as claimed in claim 4, is characterized in that:
On the oil circuit being communicated with the rod chamber of described the first telescopic oil cylinder at the second actuator port of described selector valve, side is connected to second subprime relief valve, and the oil outlet of described second subprime relief valve is communicated with fuel tank.
7. the system as claimed in claim 1, is characterized in that:
On oil circuit between described extension and contraction control connection and described the first telescopic oil cylinder, equilibrium valve is set.
8. system as claimed in claim 7, is characterized in that:
Described equilibrium valve comprises the first actuator port, the second actuator port, the 3rd actuator port, the 4th actuator port;
The first actuator port of described equilibrium valve is communicated with the first actuator port of described extension and contraction control connection, the second actuator port of described equilibrium valve is communicated with the second actuator port of described extension and contraction control connection, the 3rd actuator port of the described equilibrium valve described core pipe built-in with described the first telescopic oil cylinder is communicated with, and the 4th actuator port of described equilibrium valve is communicated with the rod chamber of the first telescopic oil cylinder.
9. a suspension arm mechanism, comprises fixed arm and at least two joint telescopic booms, it is characterized in that, also comprises: the hydraulic control system of the two oil cylinder sequential telescopics as described in claim 1-8 any one;
The piston rod of the first telescopic oil cylinder of the hydraulic control system of described pair of oil cylinder sequential telescopic is fixedly connected with described fixed arm, the cylinder body of described the first telescopic oil cylinder is fixedly connected with first segment telescopic boom, the piston rod of the second telescopic oil cylinder of the hydraulic control system of described pair of oil cylinder sequential telescopic is fixedly connected with described first segment telescopic boom, and the cylinder body of described the second telescopic oil cylinder is fixedly connected with second section telescopic boom; Described the first telescopic oil cylinder drives described first segment telescopic boom stretch out and retract; Described the second telescopic oil cylinder stretches out drawing cable mechanism by many groups and retraction drawing cable mechanism drives described second section telescopic boom and telescopic boom more than described second section telescopic boom stretch out and retract.
10. a hoist, is characterized in that: comprise suspension arm mechanism as claimed in claim 9.
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| CN201410075934.1A CN103899585B (en) | 2014-03-03 | 2014-03-03 | The hydraulic control system of a kind of pair of oil cylinder sequential telescopic, suspension arm mechanism and crane |
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| CN201410075934.1A CN103899585B (en) | 2014-03-03 | 2014-03-03 | The hydraulic control system of a kind of pair of oil cylinder sequential telescopic, suspension arm mechanism and crane |
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| CN103899585A true CN103899585A (en) | 2014-07-02 |
| CN103899585B CN103899585B (en) | 2016-08-24 |
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| CN104477795A (en) * | 2015-01-13 | 2015-04-01 | 中船华南船舶机械有限公司 | Multi-stage oil cylinder telescopic device and method for installing multi-state oil cylinder telescopic device on telescopic crane |
| CN105864134A (en) * | 2016-04-22 | 2016-08-17 | 三帕尔菲格特种车辆装备有限公司 | Multi-oil-cylinder sequential telescopic system and crane |
| CN107605832A (en) * | 2017-11-01 | 2018-01-19 | 福建侨龙应急装备有限公司 | Hydraulic jack control device, telescopic drain and mobile drainage car |
| CN107630856A (en) * | 2017-11-08 | 2018-01-26 | 安徽星马专用汽车有限公司 | A kind of sequential telescopic oil cylinder and crane |
| CN108083117A (en) * | 2017-12-21 | 2018-05-29 | 徐州重型机械有限公司 | A kind of twin-tub rope telescopic system and crane realized arm and synchronously recycled |
| CN108457924A (en) * | 2017-12-12 | 2018-08-28 | 湖南百特随车起重机有限公司 | Extension and contraction control valve, Multi-cylinder pushing handle telescopic control mechanism and Multi-cylinder driving device in proper order |
| CN109513146A (en) * | 2018-12-29 | 2019-03-26 | 徐工集团工程机械有限公司 | Device for transporting objects and sand throwing extinguishing vehicle |
| CN112627662A (en) * | 2020-12-28 | 2021-04-09 | 北京北方华创微电子装备有限公司 | Semiconductor process equipment and door opening mechanism |
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| CN104477795A (en) * | 2015-01-13 | 2015-04-01 | 中船华南船舶机械有限公司 | Multi-stage oil cylinder telescopic device and method for installing multi-state oil cylinder telescopic device on telescopic crane |
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| CN108457924A (en) * | 2017-12-12 | 2018-08-28 | 湖南百特随车起重机有限公司 | Extension and contraction control valve, Multi-cylinder pushing handle telescopic control mechanism and Multi-cylinder driving device in proper order |
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| CN109513146A (en) * | 2018-12-29 | 2019-03-26 | 徐工集团工程机械有限公司 | Device for transporting objects and sand throwing extinguishing vehicle |
| CN109513146B (en) * | 2018-12-29 | 2024-03-01 | 江苏徐工工程机械研究院有限公司 | Material conveying device and sand throwing fire extinguishing vehicle |
| CN112627662A (en) * | 2020-12-28 | 2021-04-09 | 北京北方华创微电子装备有限公司 | Semiconductor process equipment and door opening mechanism |
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