CN104591012A - Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery - Google Patents

Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery Download PDF

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Publication number
CN104591012A
CN104591012A CN201410833900.4A CN201410833900A CN104591012A CN 104591012 A CN104591012 A CN 104591012A CN 201410833900 A CN201410833900 A CN 201410833900A CN 104591012 A CN104591012 A CN 104591012A
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China
Prior art keywords
valve
cylinder
change
oil
oil cylinder
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Granted
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CN201410833900.4A
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Chinese (zh)
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CN104591012B (en
Inventor
邹兴龙
耿晓晨
周丽云
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Sany Automobile Hoisting Machinery Co Ltd
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Sany Automobile Hoisting Machinery Co Ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62Constructional features or details
    • B66C23/64Jibs
    • B66C23/70Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02Installations or systems with accumulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors

Abstract

The invention discloses a single cylinder pin type hydraulic control system and engineering machinery. The single cylinder pin type hydraulic control system comprises a first one-way valve, a balance valve, a first reversing valve and a first energy accumulator for providing pin pulling pressure for a pin, wherein the oil inlet of the first one-way valve is connected with a rod cavity of a telescopic cylinder, the oil outlet of the first one-way valve is connected with the first energy accumulator, the first reversing valve is arranged on an oil path between the rod cavity and a rodless cavity of the telescopic cylinder and a pressure oil source, the balance valve is arranged on an oil path between the rod cavity and the rodless cavity of the telescopic cylinder and the first reversing valve, and the hydraulic control system also comprises a pressure release valve and a first damper valve, the control end of the balance valve is connected with an oil tank by the pressure release valve, and the first damper valve is connected with the rod cavity of the telescopic cylinder. The single cylinder pin type hydraulic control system and the engineering machinery can provide stable and reliable pin pulling pressure.

Description

For hydraulic control system and the construction machinery and equipment of single-cylinder bolt type telescopic boom
Technical field
The present invention relates to the control field of single-cylinder bolt type telescopic boom, particularly a kind of hydraulic control system for single-cylinder bolt type telescopic boom and there is its construction machinery and equipment.
Background technology
A kind of telescopic boom with single telescopic oil cylinder has been there is in recent years in crane field, the piston rod of this telescopic oil cylinder is connected to basic arm, cylinder barrel is provided with cylinder head, the both sides of cylinder head are provided with two corresponding cylinder pins, the center shaft of these two cylinder pins is substantially coplanar with the center shaft of described telescopic oil cylinder, and the cylinder barrel of this telescopic oil cylinder can optionally lock or discharge the relative position of itself and arbitrary joint telescopic boom when above-mentioned cylinder pin stretches out or regains.In addition, between adjacent each joint telescopic boom and be equipped with arm pin between basic arm and the first telescopic boom, the relative position between adjacent telescopic boom and between basic arm and first segment telescopic boom optionally locks by this arm pin or discharges.
First the cylinder barrel of this telescopic oil cylinder can be locked by cylinder pin and minor details telescopic boom, minor details telescopic boom and joint telescopic boom second from the bottom is discharged by retraction arm pin simultaneously, and now minor details telescopic boom can be taken out of by extend action by the cylinder barrel of this telescopic oil cylinder; After minor details telescopic boom arrives desired location, itself and joint telescopic boom second from the bottom are relocked, regain the cylinder barrel of telescopic oil cylinder and itself and joint telescopic boom second from the bottom are locked, then joint telescopic boom second from the bottom and joint telescopic boom third from the bottom are discharged, now joint telescopic boom second from the bottom can be taken out of by the cylinder barrel of telescopic oil cylinder, the like can realize stretching out successively of each joint telescopic boom.
In such scheme, the Plug Action of cylinder pin and arm pin is generally controlled respectively by the cylinder pin oil cylinder fixed with cylinder barrel and arm pin oil cylinder, and flexible the flexible of i.e. telescopic oil cylinder of telescopic boom is generally realized by telescopic boom oil circuit control.Under normal circumstances, the oil circuit control of cylinder pin oil cylinder and arm pin oil cylinder adopts independent oil sources (separating with telescopic boom oil circuit control) usually, this independent oil sources by being located at core pipe in telescopic oil cylinder to cylinder pin oil cylinder or arm pin oil cylinder fuel feeding, to realize the action of cylinder pin or arm pin.
But the major defect of this scheme is: core pipe is elongated tubular, less stable, and need independently to seal and lead, have strict requirement to oil cylinder momentary velocity, and be cantilever beam, inner core tube and outer core pipe easily scrape iron filings, contaminated system; Core pipe occupies rodless cavity effective active area, therefore increases oil cylinder internal diameter parameter, thus increases oil cylinder weight; When telescopic oil cylinder stretches out at a high speed, because oil pump repairing of pulling pin is not enough, core pipe pressure is easily caused to reduce, cylinder pin oil cylinder/arm pin oil cylinder may discharge automatically, when telescopic oil cylinder is retracted at a high speed, because core pipe fluid and oil pump fluid all need by by pass valve overflow, cause core pipe pressure to raise, easily cause core tube damage; Finally, in telescopic oil cylinder telescopic process, pump of pulling pin is in overflow situation all the time, and engine torque loss is larger.
Number of patent application be CN201210210419, name is called in the patent documentation of " hydraulic control system of latch and construction machinery and equipment ", eliminate the core pipe be arranged in telescopic oil cylinder, utilize telescopic oil cylinder in telescopic process, rodless cavity or rod chamber oil circuit pass through the first check valve group to the first energy storage topping up, thus the insert-pull pin control of cylinder pin oil cylinder and arm pin oil cylinder is realized respectively by the first change-over valve and the second change-over valve, the oil return of the first check valve and the second check valve is discharged respectively to rodless cavity and rod chamber by another group check valve oil circuit.
Although eliminate telescopic oil cylinder core pipe in above-mentioned patent documentation, in the telescopic process of telescopic oil cylinder, rodless cavity and rod chamber pressure are uncertain, cause the first energy storage pressure of pulling pin uncertain, thus have impact on reliability of pulling pin.
Summary of the invention
In view of this, the present invention proposes a kind of hydraulic control system for single-cylinder bolt type telescopic boom and tool construction machinery and equipment, to provide reliable and stable pressure of pulling pin.
On the one hand, the invention provides a kind of hydraulic control system of single-cylinder bolt, described single-cylinder bolt type telescopic boom comprises telescopic boom and telescopic oil cylinder, and described hydraulic control system comprises: the first check valve, balance cock, the first change-over valve and for providing the first energy storage of pressure of pulling pin for latch; Wherein, the oil inlet of described first check valve connects the rod chamber of described telescopic oil cylinder, and oil outlet connects described first energy storage; On the rod chamber that described first change-over valve is arranged on described telescopic oil cylinder and oil circuit between rodless cavity and pressure oil-source, on the rod chamber that described balance cock is arranged on described telescopic oil cylinder and oil circuit between rodless cavity and described first change-over valve, described hydraulic control system also comprises: blowdown valve and the first dash pot valve, the control end of described balance cock connects fuel tank by described blowdown valve, and is connected the rod chamber of described telescopic oil cylinder by described first dash pot valve.
Further, described latch comprises cylinder pin and arm pin, described hydraulic control system also comprises cylinder pin oil cylinder, arm pin oil cylinder and the second change-over valve, and described second change-over valve connects described first energy storage, described cylinder pin oil cylinder, described arm pin oil cylinder and oil return branch road respectively; Described second change-over valve has three mode of operations, first mode of operation is communicated with described arm pin oil cylinder and described oil return branch road for being communicated with described first energy storage with described cylinder pin oil cylinder, second mode of operation is communicated with described cylinder pin oil cylinder and described oil return branch road for being communicated with described first energy storage with described arm pin oil cylinder, and the 3rd mode of operation is the described arm pin oil cylinder of connection and described cylinder pin oil cylinder and described oil return branch road.
Further, described hydraulic control system also comprises the 3rd change-over valve; Described 3rd change-over valve is arranged on the oil circuit between described first energy storage and described first check valve, or, be arranged on the oil circuit between described first check valve and described rod chamber.
Further, described blowdown valve is 2/2-way valve.
Further, described first change-over valve and described blowdown valve are electromagnetic valve; Described hydraulic control system also comprises: for sensing pressure sensor and the controller of oil pressure in described first energy storage; Described controller is used for the mode of operation controlling described first change-over valve and blowdown valve according to the sensing result of described pressure sensor.
Further, described first change-over valve, described second change-over valve, described 3rd change-over valve and described blowdown valve are electromagnetic valve; Described hydraulic control system also comprises: for sensing pressure sensor and the controller of oil pressure in described first energy storage; Described controller is used for the mode of operation controlling described first change-over valve, described second change-over valve, described 3rd change-over valve and the 4th change-over valve according to the sensing result of described pressure sensor.
Further, described oil return branch road comprises the second energy storage, and described second energy storage is low pressure accumulator.
Further, described hydraulic control system also comprises the second check valve, and the oil outlet of described second check valve connects described rod chamber, and the oil inlet of described second check valve connects described second energy storage.
Further, described hydraulic control system also comprises the second dash pot valve, and described second dash pot valve is arranged on the oil circuit between described first energy storage and described second change-over valve.
On the other hand, the invention provides a kind of construction machinery and equipment, be provided with single-cylinder bolt type telescopic boom, be also provided with the hydraulic control system of described single-cylinder bolt.
The hydraulic control system of single-cylinder bolt of the present invention makes rod chamber be communicated with pressure oil-source by the power failure state that obtains of control first change-over valve, simultaneously by controlling blowdown valve by balance cock control port off-load, balance cock is not opened, telescopic oil cylinder rodless cavity is in blocking, telescopic oil cylinder keeps original position, oil pump gives the first energy storage topping up by telescopic oil cylinder rod chamber, and in filling process, telescopic oil cylinder keeps motionless, can provide reliable and stable pressure of pulling pin.
Above-mentioned construction machinery and equipment, owing to comprising the hydraulic control system of this single-cylinder bolt, also has corresponding technique effect.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The hydraulic schematic diagram of the hydraulic control system of the single-cylinder bolt that Fig. 1 provides for the embodiment of the present invention.Wherein: 1-telescopic oil cylinder, 2-second change-over valve, 3-second dash pot valve, 4-pressure sensor, 5-first energy storage, 6-the 3rd change-over valve, 7-first check valve, 8-second check valve, 9-second energy storage, 10-balance cock, 11-blowdown valve, 12-first change-over valve, 13-first dash pot valve, 14-oil pump.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The hydraulic schematic diagram of the hydraulic control system of the single-cylinder bolt that Fig. 1 provides for the embodiment of the present invention; As shown in Figure 1, the hydraulic control system of the present embodiment single-cylinder bolt may be used for the latch Plug Action controlling single-cylinder bolt type telescopic boom, this telescopic boom comprises basic arm and multiple joint arm (not shown) of being sheathed on successively in basic arm and telescopic oil cylinder 1, this latch can comprise arm pin and cylinder pin, concrete structure and the set-up mode of telescopic boom, arm pin and cylinder pin and telescopic oil cylinder 1 etc. see the associated description of prior art, no longer can launch at this.
The hydraulic control system of the present embodiment can comprise: for providing the first energy storage 5, first check valve 7 of pressure of pulling pin, balance cock 10, blowdown valve 11, first change-over valve 12 and the first dash pot valve 13 for latch.Wherein: the oil inlet of the first check valve 7 connects the rod chamber of telescopic oil cylinder 1, and oil outlet connects the first energy storage 5; The oil inlet of the first change-over valve 12 is connected to pressure oil-source (as oil pump 14), return opening is connected to oil return circuit (leading to fuel tank), first actuator port is connected to the free oil inlet of balance cock 10, and the second actuator port is connected to the rod chamber of telescopic oil cylinder 1; The free oil outlet of balance cock 10 is connected to the rodless cavity of telescopic oil cylinder 1, the control port of balance cock 10 connects fuel tank by blowdown valve 11, and is connected to the oil circuit between the rod chamber of telescopic oil cylinder 1 and the second actuator port of the first change-over valve 12 by the first dash pot valve 13.
In such scheme, can by the mode of operation of control first change-over valve 12, the rod chamber of telescopic oil cylinder 1 is communicated with pressure oil-source, simultaneously can by controlling blowdown valve 11 by the control port off-load of balance cock 10, now balance cock 10 is not opened (namely its free oil outlet to free oil inlet fails to form path), the rodless cavity of telescopic oil cylinder 1 is in blocking, telescopic oil cylinder 1 keeps original position, oil sources gives the first energy storage 5 topping up by telescopic oil cylinder 1 rod chamber, in filling process, telescopic oil cylinder 1 keeps motionless, can provide reliable and stable pressure of pulling pin.It should be noted that, rodless cavity due to telescopic oil cylinder 1 is that (telescopic boom generally stretches out load-side upward, the rodless cavity of telescopic oil cylinder 1 is in confined state usually), when utilizing rodless cavity in prior art to the first energy storage topping up, when can cause pulling pin, telescopic boom sinks or falls (rebound phenomenon appears at least one joint arm), single-cylinder bolt may be made cannot to extract because friction force is excessive, and in the present embodiment, the hydraulic control system of single-cylinder bolt does not rely on rodless cavity to the first energy storage 5 topping up, effectively can avoid the problems referred to above.
Particularly, the hydraulic control system single-cylinder bolt of the single-cylinder bolt of above-described embodiment comprises the cylinder pin oil cylinder 1a and arm pin oil cylinder 1b that the cylinder barrel that is installed on telescopic oil cylinder 1 fixes.Preferably, this hydraulic control system also comprises the second change-over valve 2, second change-over valve 2 and connects the first energy storage 5, cylinder pin oil cylinder 1a, arm pin oil cylinder 1b and oil return branch road respectively; Second change-over valve 2 has three mode of operations, first mode of operation is that connection first energy storage 5 is communicated with arm pin oil cylinder 1b and oil return branch road with cylinder pin oil cylinder 1a, second mode of operation is that connection first energy storage 5 is communicated with cylinder pin oil cylinder 1a and oil return branch road with arm pin oil cylinder 1b, and the 3rd mode of operation is for being communicated with arm pin oil cylinder 1b and cylinder pin oil cylinder 1a and oil return branch road.Wherein, arm pin oil cylinder 1b (or cylinder pin oil cylinder 1a) is communicated with phase with oil return branch road and should be insert state, and arm pin oil cylinder 1b (or cylinder pin oil cylinder 1a) is communicated with phase with the first energy storage 5 and should be the state of extracting.The connected state of the first energy storage 5 and cylinder pin oil cylinder 1a and arm pin oil cylinder 1b is controlled by second change-over valve 2 with above-mentioned three mode of operations, can be at any time, arm pin oil cylinder 1b and cylinder pin oil cylinder 1a is made to have at least one to be in insert state (when pulling out cylinder pin oil cylinder 1a, arm pin oil cylinder 1b is first in insert state; When pulling out arm pin oil cylinder 1b, cylinder pin oil cylinder 1a is first in insert state; Cylinder pin oil cylinder 1a and arm pin oil cylinder 1b can be in insert state simultaneously), this kind of situation can be referred to as " interlocking " state of cylinder pin oil cylinder 1a and arm pin oil cylinder 1b, can guarantee that telescopic boom does not fall, and then avoid Peril Incident.
Preferably, the hydraulic control system of single-cylinder bolt also comprises the 3rd change-over valve 6; 3rd change-over valve 6 is arranged on the oil circuit between the first energy storage 5 and the first check valve 7, or, be arranged on the oil circuit between the first check valve 7 and the rod chamber of telescopic oil cylinder 1.The first energy storage 5 pressure higher than pull pin upper pressure limit value time, 3rd change-over valve 6 gets back to off-position, the active of oil sources of pulling pin (i.e. the first energy storage) with telescopic oil cylinder 1 can be done to keep apart, as long as there is the fluid of enough pressure in the first energy storage, can latch carried out and operating mode of pulling pin, move non-interference with telescopic oil cylinder, in telescopic oil cylinder motion process, namely also can there is latch and operating mode of pulling pin.
As shown in Figure 1, particularly, telescopic oil cylinder 1 can be single-piston rod two-way cylinder, and cylinder pin oil cylinder 1a and arm pin oil cylinder 1b all belongs to single acting oil cylinder, retracts during rod chamber oil-feed, spring reset during rod chamber oil return; Second change-over valve 2 can be three-position four-way valve, Median Function is Y type, comprise oil inlet P, oil return inlet T and actuator port A and actuator port B, second change-over valve 2 oil inlet P can connect the first energy storage 5 by the second dash pot valve 3, simultaneously, oil inlet P can connect the first check valve 7 oil outlet by the second dash pot valve 3, the 3rd change-over valve 6, and can connect telescopic oil cylinder 1 rod chamber by described first check valve 7 oil inlet; Second change-over valve 2 oil return inlet T connects the second energy storage 9 and the second check valve 8 oil inlet on oil return branch road, and connects telescopic oil cylinder 1 rod chamber by the second check valve 8 oil outlet; Second change-over valve 2 actuator port A and actuator port B are connected cylinder pin oil cylinder 1a and the arm pin oil cylinder 1b of telescopic oil cylinder 1 respectively; 3rd change-over valve 6 can adopt common on-off valve, as bi-bit bi-pass switch valve; What realize is unloading function to blowdown valve 11 (the 4th change-over valve), and various types of change-over valve can be adopted to realize, and as two position two-way valve etc., the first change-over valve 12 can adopt three position four-way directional control valve, and Median Function is Y type; First change-over valve 12 oil inlet connects oil pump 14, first change-over valve 12 return opening and connects fuel tank.
It should be noted that, above-mentioned the second dash pot valve 3 be arranged between the first energy storage 5 and the second change-over valve 2 on oil circuit plays reduction and to pull pin impact effect, is preferred version.Meanwhile, above-mentioned second check valve 8 can play the pressure oil effect that isolation rod chamber may occur, is preferred version.Second energy storage 9 can be low pressure accumulator.
In specific implementation process, for the ease of controlling, reduce time lag, first change-over valve 12 and blowdown valve 11 can adopt electromagnetic valve, on this basis, preferably, the hydraulic control system of single-cylinder bolt also comprises: for sensing pressure sensor 4 and the controller (not shown) of oil pressure in the first energy storage 5; Controller is used for the mode of operation (obtaining electricity condition or power failure state) controlling the first change-over valve 12 and blowdown valve 11 according to the sensing result of pressure sensor 4, can realize carrying out automatic liquid feeding to according to the oil pressure in the first energy storage 5 to the first energy storage 5.Further, second change-over valve 2, the 3rd change-over valve also can adopt electromagnetic valve, on this basis, preferably, controller is also for controlling the mode of operation (obtaining electric or power failure state) of the first change-over valve 12, second change-over valve 2, the 3rd change-over valve 6 and the 4th change-over valve according to the sensing result of pressure sensor 4, to realize carrying out automatic liquid feeding to the first energy storage 5, concrete control process can see below to the description of the hydraulic control system principle of work of single-cylinder bolt.
The hydraulic control system principle of work of above-mentioned single-cylinder bolt is summarized as follows:
First energy storage 5 filling process is: when the first energy storage 5 pressure that pressure sensor 4 detects lower than preset pull pin low pressure limit value time, second change-over valve 2 is in meta, 3rd change-over valve 6 is all in blowdown valve 11 and is communicated with position, and the first change-over valve 12 is in left position; Now, oil pump 14 connects telescopic oil cylinder 1 rod chamber by the first change-over valve 12, and by telescopic oil cylinder 1 rod chamber, the first check valve 7, and the 3rd change-over valve 6 connects the first energy storage 5; Because blowdown valve 11 is by balance cock 10 control port off-load, balance cock 10 is not opened, therefore, telescopic oil cylinder 1 rodless cavity is in blocking, telescopic oil cylinder 1 cannot action, keep original position, oil pump 14 carries out topping up by telescopic oil cylinder 1 rod chamber through the first check valve 7 and the 3rd change-over valve 6 to the first energy storage 5, when the first energy storage 5 pressure that pressure sensor 4 detects higher than preset pull pin upper pressure limit value time, controller controls the 3rd change-over valve 6 and gets back to off-position, first change-over valve 12 gets back to meta simultaneously, and the first energy storage 5 stops topping up; Seen from the above description, pressure sensor 4, first energy storage 5, the 3rd change-over valve 6, first check valve 7, blowdown valve 11, first dash pot valve 13 and the first change-over valve 12 together form an energy storage automatic liquid feeding loop; Concrete control logic (in following table, "-" represents dead electricity, and "+" represents electric) as shown in table 1:
Table 1
Operating mode DT1 DT2 DT3 DT4 DT5 DT6
Energy storage topping up + +
Pulling out cylinder pin process is: when the second change-over valve 2 is in left position, first energy storage 5 connects the second change-over valve 2 oil inlet P by the second dash pot valve 3, and the cylinder pin oil cylinder 1a of telescopic oil cylinder 1 is connected by the second change-over valve 2, thus cylinder pin oil cylinder 1a is retracted, simultaneously, the arm pin oil cylinder 1b fluid of telescopic oil cylinder 1 gets back to the second energy storage 9 by the second change-over valve 2, and connects telescopic oil cylinder 1 rod chamber by the second check valve 8; Therefore, arm pin oil cylinder 1b is in insert state under spring force and pulls out arm pin process and be: when the second change-over valve 2 is in right position, first energy storage 5 connects the second change-over valve 2 oil inlet P by the second dash pot valve 3, and the arm pin oil cylinder 1b of telescopic oil cylinder 1 is connected by the second change-over valve 2, thus arm pin oil cylinder 1b is retracted, simultaneously, the cylinder pin oil cylinder 1a fluid of telescopic oil cylinder 1 gets back to the second energy storage 9 by the second change-over valve 2, and connect telescopic oil cylinder 1 rod chamber by the second check valve 8, now, cylinder pin oil cylinder 1a is in insert state under spring force; In addition, when the second change-over valve 2 is in meta, cylinder pin oil cylinder 1a and the arm pin oil cylinder 1b fluid of telescopic oil cylinder 1 get back to the second energy storage 9 by the second change-over valve 2, and connect telescopic oil cylinder 1 rod chamber by the second check valve 8.Now, cylinder pin oil cylinder 1a and arm pin oil cylinder 1b under spring force, is all in insert state; Second energy storage 9 belongs to low pressure accumulator, plays the effect of buffering and temporary fluid, prevents the latch situation not in place that telescopic oil cylinder 1 rod chamber pressure causes; Seen from the above description, second change-over valve 2 is for the control of pulling pin of cylinder pin oil cylinder 1a and arm pin oil cylinder 1b, when the first energy storage 5 pressure only detected at pressure sensor 4 is in default pulling pin between upper pressure limit value and lower limit, the second change-over valve 2 could be allowed to carry out control of pulling pin, three mode of operations of the second change-over valve 2 achieve cylinder pin oil cylinder 1a and arm pin oil cylinder 1b and have at least to be in an insert state (i.e. " interlocking " control), and concrete control logic is as shown in table 2:
Table 2
Operating mode DT1 DT2 DT3 DT4 DT5 DT6
Pull out cylinder pin +
Pull out arm pin +
Insert
In addition, the first change-over valve 12 controls for the expanding-contracting action of telescopic oil cylinder 1, and concrete control logic is as shown in table 3:
Table 3
Operating mode DT3 DT4 DT5 DT6
Stretch oil cylinder + +
Contracting oil cylinder + +
The present embodiment utilizes rod chamber oil circuit to carry out automatic liquid feeding to the first energy storage, realization is pulled pin control, in filling process, telescopic oil cylinder keeps motionless, effectively prevent prior art when telescopic oil cylinder action, the uncertain unreliable problem of pulling pin caused of load pressure, provide reliable and stable oil sources of pulling pin, thus improve the reliability of cylinder arm pin action; In addition, adopt the second change-over valve, its three kinds of mode of operations ensure that cylinder pin and arm pin have at least one to be in insert state, achieve the interlocking of the action of cylinder pin and the action of arm pin, improve safety of pulling pin; By pressure sensor Real-Time Monitoring first energy storage pressure, and by controlling the on off mode controlling the 3rd change-over valve according to monitoring result, thus oil sources of pulling pin (i.e. the first energy storage) is initiatively done to keep apart with telescopic oil cylinder, as long as there is the fluid of enough pressure in the first energy storage, in telescopic oil cylinder motion process, latch also can be there is and operating mode of pulling pin.
Other embodiments of the invention additionally provide a kind of construction machinery and equipment, and are provided with the hydraulic control system of above-mentioned single-cylinder bolt.Particularly, this project machinery can include but not limited to hoisting crane.This project machinery, owing to comprising the hydraulic control system of above-mentioned single-cylinder bolt, also has corresponding technique effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. the hydraulic control system for single-cylinder bolt type telescopic boom, described single-cylinder bolt type telescopic boom comprises telescopic boom and telescopic oil cylinder (1), it is characterized in that, described hydraulic control system comprises: the first check valve (7), balance cock (10), the first change-over valve (12) and for providing first energy storage (5) of pressure of pulling pin for latch; Wherein, the oil inlet of described first check valve (7) connects the rod chamber of described telescopic oil cylinder (1), and oil outlet connects described first energy storage (5); On the rod chamber that described first change-over valve (12) is arranged on described telescopic oil cylinder (1) and oil circuit between rodless cavity and pressure oil-source, on the rod chamber that described balance cock (10) is arranged on described telescopic oil cylinder (1) and oil circuit between rodless cavity and described first change-over valve (12); Described hydraulic control system also comprises: blowdown valve (11) and the first dash pot valve (13), the control end of described balance cock (10) connects fuel tank by described blowdown valve (11), and connects the rod chamber of described telescopic oil cylinder (1) by described first dash pot valve (13).
2. hydraulic control system according to claim 1, it is characterized in that, described latch comprises cylinder pin and arm pin, described hydraulic control system also comprises cylinder pin oil cylinder (1a), arm pin oil cylinder (1b) and the second change-over valve (2), and described second change-over valve (2) connects described first energy storage (5), described cylinder pin oil cylinder (1a), described arm pin oil cylinder (1b) and oil return branch road respectively; Described second change-over valve (2) has three mode of operations, first mode of operation is communicated with described arm pin oil cylinder (1b) and described oil return branch road for being communicated with described first energy storage (5) with described cylinder pin oil cylinder (1a), second mode of operation is communicated with described cylinder pin oil cylinder (1a) and described oil return branch road for being communicated with described first energy storage (5) with described arm pin oil cylinder (1b), and the 3rd mode of operation is for being communicated with described arm pin oil cylinder (1b) and described cylinder pin oil cylinder (1a) and described oil return branch road.
3. hydraulic control system according to claim 2, is characterized in that, also comprises the 3rd change-over valve (6); Described 3rd change-over valve (6) is arranged on the oil circuit between described first energy storage (5) and described first check valve (7), or, be arranged on the oil circuit between described first check valve (7) and described rod chamber.
4. hydraulic control system according to claim 3, is characterized in that, described blowdown valve (11) is 2/2-way valve.
5. the hydraulic control system according to any one of claim 1-4, is characterized in that, described first change-over valve (12) and described blowdown valve (11) are electromagnetic valve; Described hydraulic control system also comprises: for sensing pressure sensor (4) and the controller of oil pressure in described first energy storage (5); Described controller is used for the mode of operation controlling described first change-over valve (12) and blowdown valve (11) according to the sensing result of described pressure sensor (4).
6. hydraulic control system according to claim 3, it is characterized in that, described first change-over valve (12), described second change-over valve (2), described 3rd change-over valve (6) and described blowdown valve (11) are electromagnetic valve; Described hydraulic control system also comprises: for sensing pressure sensor (4) and the controller of oil pressure in described first energy storage (5); Described controller is used for the mode of operation controlling described first change-over valve (12), described second change-over valve (2), described 3rd change-over valve (6) and the 4th change-over valve according to the sensing result of described pressure sensor (4).
7. the hydraulic control system according to any one of claim 2 to 4, is characterized in that, described oil return branch road comprises the second energy storage (9), and described second energy storage (9) is low pressure accumulator.
8. according to the hydraulic control system described in claim 7, it is characterized in that, also comprise the second check valve (8), the oil outlet of described second check valve (8) connects described rod chamber, and the oil inlet of described second check valve (8) connects described second energy storage (9).
9. according to Claim 8 described in hydraulic control system, it is characterized in that, also comprise the second dash pot valve (3), described second dash pot valve (3) is arranged on the oil circuit between described first energy storage (5) and described second change-over valve (2).
10. a construction machinery and equipment, is provided with single-cylinder bolt type telescopic boom, it is characterized in that, is also provided with the hydraulic control system according to any one of claim 1-9.
CN201410833900.4A 2014-12-29 2014-12-29 Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery Active CN104591012B (en)

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CN113353819A (en) * 2021-06-09 2021-09-07 安徽柳工起重机有限公司 Single-cylinder bolt telescopic hydraulic system and telescopic boom crane

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