CN206917957U - Load-sensitive rotary buffering valve and hydraulic system of crane - Google Patents
Load-sensitive rotary buffering valve and hydraulic system of crane Download PDFInfo
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- CN206917957U CN206917957U CN201720761619.3U CN201720761619U CN206917957U CN 206917957 U CN206917957 U CN 206917957U CN 201720761619 U CN201720761619 U CN 201720761619U CN 206917957 U CN206917957 U CN 206917957U
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Abstract
The utility model discloses a kind of load-sensitive rotary buffering valve and hydraulic system of crane,It is that the Road of slewing directional control valve is fed back into oil circuit by LS to be connected with guide's hydraulic fluid port of three-way pressure compensating valve and the oil inlet of permanent flow valve successively,The oil inlet of three-way pressure compensating valve connects with the oil inlet of valve body,The oil-out of three-way pressure compensating valve connects with the oil return opening of valve body,The oil-out of permanent flow valve is divided into two-way,Directly it is connected all the way with the oil return opening of valve body,Another way connects with the oil inlet of the first check valve and the second check valve simultaneously,Three-way pressure compensating valve forms a flow speed control valve with slewing directional control valve,So as to realize two actuator port A mouths,The Flow-rate adjustment of B mouths,Flow is set to export in proportion,Do not influenceed by load,Operate in whole process,Stable action,It will not neglect and neglect soon slowly,Realize steady open,Compression shock is small during stopping,So that crane does not have rotary oscillation.
Description
Technical field
Engineering machinery field is the utility model is related to, specifically a kind of load-sensitive rotary buffering valve and crane rotation liquid
Pressure system.
Background technology
Middle tonnage automobile crane, arm is long, band loading capacity is big, and when complete machine carries out revolution operation, revolution inertia is larger
Cause turnability poor (idle stroke is big during startup, rotary oscillation is big when stopping), according to closed system, although operating characteristics
It is superior, but cost is higher.
Chinese patent 01142605.5 discloses a kind of rotary buffering valve, and principle is as shown in figure 1, including main valve body, main valve
Oil inlet P, oil-out T and the actuator port A/B mouths for connecting hydraulic motor are provided with body, the oil inlet P mouth of main valve body and is gone out
Hydraulic fluid port T mouths connect the oil inlet and oil-out for manipulating reversal valve 1 respectively, there is trimmer valve 4 in main valve body, and the bypass of trimmer valve 4 is connected to shuttle
Valve 5, the left chamber of trimmer valve 4 are connected with the import of magnetic valve 6, the right chamber of trimmer valve 4, the import of pilot valve 3 respectively, and the outlet of magnetic valve 6 connects
Fuel tank, the outlet of pilot valve 3 connect pressure relief opening L mouths, also have in main valve body and manipulate reversal valve 1, manipulate left and right in reversal valve 1 and dispose respectively
Have pipeline connection and check valve 2a, 2b for reversely connecting, the manipulation oil-out of reversal valve 1 connects respectively connects the both ends of trimmer valve 4, grasps
Road one end of vertical reversal valve 1 is connected with P mouths, and the other end is divided into two-way, is connected all the way by check valve 2A, 2B and trimmer valve 4,
Another way is connected with T mouths.The manipulation reversal valve 1 of the patent uses by-pass shunt principle, during operating, loads end pressure
Fluctuation, A/B mouth flows can be directly affected, i.e. output flow is unstable, so as to cause revolution neglect it is fast neglect it is slow, such as operation handle position
Put in the case of keeping constant, when load becomes big, hydraulic oil that pump the is got end A/B mouths that unload reduce, and more hydraulic oil lead to
The oil return box of operation reversal valve 1 is crossed, so as to which rotational speed is slack-off, when similarly load reduces, rotational speed accelerates, hoister in large tonnage
Using the revolution technology, because inertia load is larger, idle stroke is big when causing to start, when stopping turntable swinging it is big, to people and machine all
In the presence of potential danger.
Utility model content
In order to solve the problems, such as that prior art is present, the utility model provides a kind of load-sensitive rotary buffering valve, is returning
Turn reversal valve and valve body connects three-way pressure compensating valve and permanent flow valve, threeway into and out of between hydraulic fluid port by sensing feed-back oil circuit
Pressure-compensated valve forms a flow speed control valve with slewing directional control valve, so as to realize the first actuator port A and the second actuator port B stream
Amount regulation, makes flow export in proportion, is not influenceed by load, operates in whole process, stable action, will not neglect and neglect soon
Slowly, realize it is steady open, compression shock is small during stopping, from without rotary oscillation.
The utility model adopts the following technical scheme that：Load-sensitive rotary buffering valve, including valve body, there is oil-feed on valve body
Mouth, oil return opening, the first actuator port and the second actuator port, the first described actuator port and the second actuator port are respectively used to
Communicated with the both sides hydraulic fluid port of rotary motor, slewing directional control valve and precursor overflow valve, the oil inlet of slewing directional control valve are provided with valve body
The oil inlet with valve body, oil return opening connect respectively with oil return opening, two actuator ports of slewing directional control valve respectively with valve body
One actuator port and the connection of the second actuator port；Precursor overflow valve includes main valve and pilot valve, and main valve is connected on the first actuator port
Between the second actuator port, main valve bypass is connected to shuttle valve, the left chamber of main valve by orifice valve respectively the oil inlet with magnetic valve,
The right chamber of main valve connects with the oil inlet of pilot valve, and the oil-out of pilot valve and the drain tap of valve body connect；First work of valve body
Make the oil-out of hydraulic fluid port and the second actuator port also respectively with the first check valve and the second check valve to connect, the first check valve and
The oil inlet of two check valves is interconnected；The Road of slewing directional control valve by successively with guide's hydraulic fluid port of three-way pressure compensating valve and
The oil inlet connection of permanent flow valve, the oil inlet of three-way pressure compensating valve connect with the oil inlet of valve body, three-way pressure compensating valve
Oil-out connects with the oil return opening of valve body, and the oil-out of permanent flow valve is divided into two-way, is directly connected all the way with the oil return opening of valve body, separately
Connected simultaneously with the oil inlet of the first check valve and the second check valve all the way.
Load-sensitive rotary buffering valve of the present utility model, applied to open circuit, after complete machine is opened, revolution commutation
When valve is without operation, LS feedback oil circuit pressures are zero, and the hydraulic oil that pump (being generally constant displacement pump) is got enters the oil inlet of valve body, leads to
Crossing three-way pressure compensating valve, the oil return opening oil return through valve body is to fuel tank again, and now the pressure for the hydraulic oil that pump is got is pressure compensation
The pressure that valve is set, this pressure is smaller, the Low-pressure load discharge function of pump during so as to realize attonity.
Three-way pressure compensating valve of the present utility model is substantially a constant difference overflow valve, and has proportional reversing valve concurrently
Feature, three-way pressure compensating valve and slewing directional control valve form a typical flow speed control valve, so as to realize the first actuator port and the
The flow of two actuator ports exports in proportion, and is not influenceed by load.
When operation handle operation slewing directional control valve is gradually opened, the flow of output gradually increases, and the flow is big
It is small not affected by a load, and (for by-pass shunt principle under heavy load, slewing directional control valve open stage is several for the steady unlatching of realization
No flow removes the first actuator port and the second actuator port, and most of flow is by bypassing oil return box, so as to cause handle
When opening very big, revolution flow is also zero, turns round attonity, i.e. operation handle idle stroke is big, it may also be said to which slewing directional control valve is effective
Operational stroke is small)；When handle progressively closes off, i.e. slewing directional control valve opening is gradually reduced, the first actuator port or the second work
The output flow of hydraulic fluid port is gradually reduced, and is gradually increased by the flow of three-way pressure compensating valve, until the first actuator port and the
Two actuator port output flows are zero, whole flows of pump by three-way pressure compensating valve oil return box because this flow reduce
Process does not have flow mutation, and flow trim reduces, so external load (rotary motor) is slowly slowed down up to lock of controller,
Motor stops completely, so workable when stopping, compression shock is small during stopping, from without rotary oscillation.
In summary, load-sensitive rotary buffering valve of the present utility model has advantages below：
1st, for hoister in large tonnage, revolution opening process is steady, and idle stroke is small, and operating range is big, and manual dexterity is high：
When slewing directional control valve is gradually opened, the flow of output gradually increases, and the size of the flow is not affected by a load, can be real
It is now steady to open.
2nd, when revolution stops, stopping is slow in one's movements steady, and compression shock is small, and the controllability of operation is strong：Work as slewing directional control valve
Opening is gradually reduced, and the first actuator port and the second actuator port output flow are gradually reduced, and pass through three-way pressure compensating valve
Flow gradually increases, until the first actuator port and the second actuator port output flow are zero, whole flows of pump pass through threeway
Pressure-compensated valve oil return box.Because the process that this flow reduces does not have flow mutation, flow trim reduces, so rotary motor delays
It is slow to slow down until lock of controller-motor stops completely.So workable when stopping, compression shock is small during stopping, so as to
There is no rotary oscillation.
3rd, the influence of LS pressure oscillations is eliminated：Permanent flow valve (constant flow rate valve) is provided with LS feedback oil circuits, can effectively be disappeared
Except the pressure oscillation on load feedback hydraulic fluid port, so as to ensure the steady non-jitter of three-way pressure compensating valve stem movement, so as to realize
The flow trim of two actuator ports.
The utility model additionally provides a kind of hydraulic system of crane, including motor brake and rotary motor, also
Including load-sensitive rotary buffering valve as described above.
Because above-mentioned rotary buffering valve has above-mentioned technique effect, there is the crane rotation hydraulic pressure of above-mentioned rotary buffering valve
System also has identical technique effect
Further, motor brake is also associated with one-way damper valve, and motor brake can take oil from pilot control block,
Oil can also be taken from the both sides hydraulic fluid port of rotary motor, one-way damper valve ensures that brake changes down pass soon.
Brief description of the drawings
Fig. 1 is the schematic diagram of existing rotary buffering valve.
Fig. 2 is the schematic diagram of the hydraulic system of crane of embodiment one.
Fig. 3 is the schematic diagram of the hydraulic system of crane of embodiment two
Embodiment
Embodiment of the present utility model is described specifically below in conjunction with the accompanying drawings：
Embodiment one
Load-sensitive rotary buffering valve 100, as shown in Fig. 2 including valve body, there is oil inlet P mouth, oil return inlet T on valve body
Mouth, the first actuator port A mouths, the second actuator port B mouths, the first guide hydraulic fluid port a1 mouths, second guide's hydraulic fluid port b1 mouths and unloading port L
Mouthful, A mouths and B mouths are respectively used to communicate with the both sides hydraulic fluid port of rotary motor 201, and slewing directional control valve 101 and guide are provided with valve body
Overflow valve 103, described slewing directional control valve 101 are pilot proportional reversing valves, the oil inlet and oil return opening of slewing directional control valve 101
The P mouths with valve body, T mouths connect respectively, and the A mouths with valve body, B mouths connect two actuator ports of slewing directional control valve 101 respectively, return
Turn reversal valve 101 first guide's hydraulic fluid port and second guide's hydraulic fluid port respectively with first guide's hydraulic fluid port a1, the second guide on valve body
Hydraulic fluid port b1 is communicated；Precursor overflow valve 103 includes main valve 103b and pilot valve 103a, and main valve 103b is connected between A mouths and B mouths, main
Valve 103b bypasses are connected to shuttle valve 104, and main valve 103b left chamber passes through orifice valve 105 oil inlet with magnetic valve 106, main valve respectively
103b right chamber connects with pilot valve 103a oil inlet, the drain tap L connections of pilot valve 103a oil-out and valve body；Valve body
Oil-out also respectively with the first check valve 102a and the second check valve 102b of A mouths and B mouths connect, the first check valve 102a and
Second check valve 102b oil inlet is interconnected；The Road of slewing directional control valve 101 by LS feed back oil circuit successively with threeway pressure
The oil inlet connection of guide's hydraulic fluid port of force compensating valve 108, permanent flow valve 107, the oil inlet of three-way pressure compensating valve 108 and valve body
P mouths connect, and the oil-out of three-way pressure compensating valve 108 connects with the T mouths of valve body, and the oil-out of permanent flow valve 107 is divided into two-way, and one
Road is directly connected with the T mouths of valve body, and another way connects with the first check valve 102a, the second check valve 102b oil inlet simultaneously.
The utility model also provides a kind of hydraulic system of crane, and principle is as shown in figure 1, including motor brake
202 and rotary motor 201, motor brake 202 and take and be connected with one-way damper valve 203, in addition to as above institute between hydraulic fluid port M mouths
The load-sensitive rotary buffering valve 100 stated.
M mouths take oil to have number of ways：Oil can be taken from pilot control block, can also be taken from the left and right chamber of rotary motor 201
Oil, one-way damper valve 203 ensure that motor brake 202 changes down pass soon.
After complete machine is opened, when slewing directional control valve 101 is without operation, the pressure of LS feedback oil circuits is zero, and pump is (generally quantitative
Pump) hydraulic oil got enters the P mouths of rotary buffering valve 100, T mouth oil returns are arrived by three-way pressure compensating valve 108, now pump is beaten
The hydraulic fluid pressure gone out is the pressure that three-way pressure compensating valve 108 is set, and this pressure is smaller, and pump is low during so as to realize attonity
Press unloading function.Three-way pressure compensating valve is substantially a constant difference overflow valve, and (valve rod the characteristics of have proportional reversing valve concurrently
Throttling channel is proportional throttle valve), three-way pressure compensating valve 108 and slewing directional control valve 101 form a typical flow speed control valve, so as to
Realize that the flow of the flow of A/B mouths exports in proportion, and do not influenceed by load.
For example a1 mouths pilot pressure gradually also gradually never reaches standard-sized sheet, P mouths from zero to maximum, slewing directional control valve 101
A hydraulic oil part from the oil return of three-way pressure compensating valve 108, a part arrives rotary motor left chamber by slewing directional control valve 101,
Hydraulic oil feeds back to three-way pressure compensating valve 108 after the primary choke of slewing directional control valve 101 by LS feedback oil circuits simultaneously
Spring terminal, from the force analysis of three-way pressure compensating valve 108 understand P mouth pressure subtract LS feedback oil circuit pressure be equal to three-way pressure
Constant the setting pressure of the spring of recuperation valve 108, i.e. the restriction pressure at two ends of slewing directional control valve 101 are this value, according to flow formula
Understand, the flow of output be now only open with slewing directional control valve 101 it is relevant, it is unrelated with load：
P-PLS=KX
K is spring rate, constant；C is discharge coefficient, constant.
When slewing directional control valve 101 is gradually opened, the flow of output gradually increases, and the size of the flow is not loaded
Influence, and realize steady open：By-pass shunt principle the open stage of slewing directional control valve 101, does not almost flow under heavy load
Amount removes A/B mouths, and most of flow is by bypassing oil return box, during so as to cause the handle of slewing directional control valve 101 to open very big, rotary current
Amount is also zero, turns round attonity, i.e. operation handle idle stroke is big, it may also be said to which effective operational stroke of slewing directional control valve 101 is small.
When the opening of slewing directional control valve 101 is gradually reduced, A/B mouth output flows are gradually reduced, and pass through three-way pressure compensating valve
108 flow gradually increases, until it is zero that A/B mouths, which output, whole flows of pump pass through the oil return of three-way pressure compensating valve 108
Case.Because the process that this flow reduces does not have a flow mutation, flow trim reduces, thus rotary motor 201 slowly slow down until
202 lockings of motor brake-rotary motor 202 stops completely, so workable when stopping, compression shock is small during stopping,
From without rotary oscillation.
When operating revolution, A/B mouth load pressures have fluctuation, anti-in LS in order to eliminate the pressure oscillation of LS feedback oil circuits
Permanent flow valve 107 is provided with feedback oil circuit, so as to ensure that the opening and closing of three-way pressure compensating valve 108 are slowly stablized.
Embodiment two
Load-sensitive rotary buffering valve 100, as shown in figure 3, the present embodiment uses damping with differing only in for embodiment one
109 bags of body permanent flow valves 107 of valve.
Above-described is only specific embodiment of the present utility model.It should be pointed out that the ordinary skill for this area
For personnel, on the premise of the utility model principle is not departed from, some variations and modifications can also be made, these also should be regarded as
Belong to the scope of protection of the utility model.
Claims (6)
1. load-sensitive rotary buffering valve, including valve body, there is oil inlet, oil return opening, the first actuator port and second on valve body
Actuator port, the first described actuator port and the second actuator port are respectively used to communicate with the both sides hydraulic fluid port of rotary motor, valve
Be provided with slewing directional control valve and precursor overflow valve in vivo, the oil inlet and oil return opening of slewing directional control valve respectively the oil inlet with valve body,
Oil return opening connects, and two actuator ports of slewing directional control valve connect with the first actuator port of valve body and the second actuator port respectively
It is logical；Precursor overflow valve includes main valve and pilot valve, and main valve is connected between the first actuator port and the second actuator port, main valve bypass
It is connected to shuttle valve, the oil inlet that the left chamber of main valve passes through the orifice valve oil inlet with magnetic valve, the right chamber of main valve and pilot valve respectively
Connection, the oil-out of pilot valve and the drain tap of valve body connect；The first actuator port and the second actuator port of valve body are also distinguished
Connected with the oil-out of the first check valve and the second check valve, the oil inlet of the first check valve and the second check valve is interconnected；
It is characterized in that：The Road of slewing directional control valve by LS feed back oil circuit successively with guide's hydraulic fluid port of three-way pressure compensating valve and constant current
The oil inlet connection of valve, the oil inlet of three-way pressure compensating valve connects with the oil inlet of valve body, three-way pressure compensating valve it is fuel-displaced
Mouth connects with the oil return opening of valve body, and the oil-out of permanent flow valve is divided into two-way, is directly connected all the way with the oil return opening of valve body, another way
Connected simultaneously with the oil inlet of the first check valve and the second check valve.
2. load-sensitive rotary buffering valve according to claim 1, it is characterised in that：Described permanent flow valve can use damping
Valve replaces.
3. load-sensitive rotary buffering valve according to claim 1 or 2, it is characterised in that：Described slewing directional control valve is
Proportional reversing valve.
4. load-sensitive rotary buffering valve according to claim 3, it is characterised in that：The first of pilot proportional reversing valve
Guide's hydraulic fluid port and second guide's hydraulic fluid port communicate with first guide's hydraulic fluid port on valve body, second guide's hydraulic fluid port respectively.
5. hydraulic system of crane, including motor brake and rotary motor, it is characterised in that：Also include claim 1-
Load-sensitive rotary buffering valve any one of 4.
6. hydraulic system of crane according to claim 5, it is characterised in that：Motor brake is also associated with unidirectionally
Orifice valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720761619.3U CN206917957U (en) | 2017-06-28 | 2017-06-28 | Load-sensitive rotary buffering valve and hydraulic system of crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720761619.3U CN206917957U (en) | 2017-06-28 | 2017-06-28 | Load-sensitive rotary buffering valve and hydraulic system of crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206917957U true CN206917957U (en) | 2018-01-23 |
Family
ID=61323322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720761619.3U Withdrawn - After Issue CN206917957U (en) | 2017-06-28 | 2017-06-28 | Load-sensitive rotary buffering valve and hydraulic system of crane |
Country Status (1)
| Country | Link |
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| CN (1) | CN206917957U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355437A (en) * | 2017-06-28 | 2017-11-17 | 安徽柳工起重机有限公司 | Load-sensitive rotary buffering valve and hydraulic system of crane |
| CN108506259A (en) * | 2018-04-09 | 2018-09-07 | 徐州燕大传动与控制技术有限公司 | A kind of load sensing formula multi-way valve of the inlet and outlet independent control of valve post-compensation |
| CN108591177A (en) * | 2018-07-13 | 2018-09-28 | 徐州重型机械有限公司 | Turn round buffer unit, rotary control system and engineering machinery |
| CN111039203A (en) * | 2019-12-30 | 2020-04-21 | 徐州重型机械有限公司 | Liquid resistance braking rotary system |
| CN111634831A (en) * | 2020-06-12 | 2020-09-08 | 三一汽车起重机械有限公司 | Rotary hydraulic control system and crane |
-
2017
- 2017-06-28 CN CN201720761619.3U patent/CN206917957U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355437A (en) * | 2017-06-28 | 2017-11-17 | 安徽柳工起重机有限公司 | Load-sensitive rotary buffering valve and hydraulic system of crane |
| CN108506259A (en) * | 2018-04-09 | 2018-09-07 | 徐州燕大传动与控制技术有限公司 | A kind of load sensing formula multi-way valve of the inlet and outlet independent control of valve post-compensation |
| CN108591177A (en) * | 2018-07-13 | 2018-09-28 | 徐州重型机械有限公司 | Turn round buffer unit, rotary control system and engineering machinery |
| CN111039203A (en) * | 2019-12-30 | 2020-04-21 | 徐州重型机械有限公司 | Liquid resistance braking rotary system |
| CN111039203B (en) * | 2019-12-30 | 2021-11-02 | 徐州重型机械有限公司 | Liquid resistance braking rotary system |
| CN111634831A (en) * | 2020-06-12 | 2020-09-08 | 三一汽车起重机械有限公司 | Rotary hydraulic control system and crane |
| CN111634831B (en) * | 2020-06-12 | 2022-05-24 | 三一汽车起重机械有限公司 | Rotary hydraulic control system and crane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180123 Effective date of abandoning: 20230425 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180123 Effective date of abandoning: 20230425 |