CN109578352B - Load-sensitive system and aerial work platform - Google Patents
Load-sensitive system and aerial work platform Download PDFInfo
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- CN109578352B CN109578352B CN201910078915.7A CN201910078915A CN109578352B CN 109578352 B CN109578352 B CN 109578352B CN 201910078915 A CN201910078915 A CN 201910078915A CN 109578352 B CN109578352 B CN 109578352B
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- 230000007246 mechanism Effects 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 177
- 239000010720 hydraulic oil Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101710179738 6,7-dimethyl-8-ribityllumazine synthase 1 Proteins 0.000 description 1
- 101710186608 Lipoyl synthase 1 Proteins 0.000 description 1
- 101710137584 Lipoyl synthase 1, chloroplastic Proteins 0.000 description 1
- 101710090391 Lipoyl synthase 1, mitochondrial Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The present disclosure discloses a load-sensitive system and aerial work platform, the load-sensitive system includes: an oil tank; the load-sensitive variable pump comprises an oil supply port for supplying oil to a load, an oil suction port for sucking oil from an oil tank and a load-sensitive port for feeding back load pressure to adjust displacement; the first executing device comprises a first executing mechanism and a first control valve connected between the first executing mechanism and the oil supply port, and the first control valve controls oil inlet and oil outlet of the first executing mechanism so as to control the first executing mechanism to act; the first flow control valve is connected between the first execution device and the oil supply port and used for controlling the flow rate supplied by the oil supply port to the first execution device; the on-off valve is connected between the first flow control valve and the first execution device and used for controlling the on-off of a flow path between the first flow control valve and the first execution device; the first feedback oil taking port is arranged on a flow path between the on-off valve and the first executing device and is connected with the load sensitive port.
Description
Technical Field
The invention relates to the field of hydraulic pressure, in particular to a load sensitive system and an aerial working platform.
Background
Along with the rapid development of the construction of the infrastructure in China, the demand and the holding quantity of the aerial work platform are rapidly increased, and meanwhile, the national requirements for energy conservation and environmental protection are greatly advocated, and the work energy consumption of the whole aerial work platform is required to be reduced as much as possible from the aspect of the benefit of users, so that the requirements for the aerial work platform control system are also higher and higher.
In various systems of an aerial working platform, a hydraulic system is one of important components, compared with other systems, the hydraulic system is directly related to an engine, and the output power of the hydraulic system directly influences the output power of the engine, so that the oil consumption of the engine is influenced.
A fixed displacement pump load sensitive system or a constant pressure system is partially adopted in a hydraulic system of the existing aerial working platform, so that large flow or pressure loss exists, hydraulic energy is wasted, and economical efficiency is poor. In the prior art, part of hydraulic systems adopt variable pump load sensitive systems, but the variable pump load sensitive systems in the prior art have the defect of slow response when a platform with a longer pipeline acts.
Disclosure of Invention
The invention aims to provide a load-sensitive system which has the advantages of good economy and quick action response of an executing device. The second aspect of the invention discloses an aerial working platform applying the load-sensitive system.
The first aspect of the present invention discloses a load sensitive system comprising:
An oil tank;
The load-sensitive variable pump comprises an oil supply port for supplying oil to a load, an oil suction port for sucking oil from the oil tank and a load-sensitive port for feeding back load pressure to adjust the displacement;
The first executing device comprises a first executing mechanism and a first control valve connected between the first executing mechanism and the oil supply port, and the first control valve controls oil inlet and drain of the first executing mechanism so as to control the first executing mechanism to act;
a first flow control valve connected between the first actuator and the oil supply port for controlling the flow rate supplied from the oil supply port to the first actuator;
The on-off valve is connected between the first flow control valve and the first execution device and used for controlling the on-off of a flow path between the first flow control valve and the first execution device;
The first feedback oil taking port is arranged on a flow path between the on-off valve and the first executing device and is connected with the load sensitive port.
In some embodiments, the first flow control valve comprises a speed valve or a constant flow valve.
In some embodiments, the on-off valve is a two-position two-way solenoid valve.
In some embodiments, the first actuating mechanism includes a plurality of oil ports connected with the first control valve, the first control valve controls oil inlet and exhaust of the plurality of oil ports, the load sensing system further includes an oil exhaust on-off valve and a first comparison valve connected with the plurality of oil ports, the first comparison valve is used for comparing to obtain a first maximum oil pressure of the plurality of oil ports, the oil exhaust on-off valve is connected with the first feedback oil taking port and the oil tank, and the first comparison valve is connected with a hydraulic control port of the oil exhaust on-off valve to control on-off of the oil exhaust on-off valve.
In some embodiments, the oil drain on-off valve comprises a first hydraulic control port positioned at one end of the valve, a second hydraulic control port positioned at the other end of the valve and a spring, wherein the first hydraulic control port is connected with an oil inlet of the oil drain on-off valve, and the second hydraulic control port is connected with the first comparison valve so that the opening pressure of the oil drain on-off valve is the sum of the pressure of the first maximum oil pressure and the pressure of the spring.
In some embodiments, the load sensitive system comprises more than two of the first actuators.
In some embodiments, the first actuator of one of the two or more first actuators is a platform swing motor of the aerial work platform, and the first actuator of one of the two or more first actuators is a crank arm luffing cylinder of the aerial work platform.
In some embodiments, the load sensing system further comprises a constant flow valve connected between the pilot port of the drain on-off valve and the tank.
In some embodiments, the load-sensitive system further comprises a second actuator and an oil supply communication port for supplying oil to the second actuator, the oil supply communication port being provided on a flow path connected to the first flow control valve and the oil supply port, the first feedback oil intake port being located in proximity to the second actuator relative to the first actuator.
In some embodiments, the second execution means comprises:
A second actuator; and
The second flow control valve is connected between the second executing mechanism and the oil supply port and is used for controlling the flow of hydraulic oil entering the second executing mechanism, and an oil outlet of the second flow control valve, which is communicated with the second executing mechanism, is connected with a flow path connected between the first feedback oil taking port and the load sensitive port.
In some embodiments, the load sensitive system includes more than two of the second actuators.
In some embodiments, the second actuator of one of the two or more second actuators is a boom luffing cylinder of the aerial working platform, and the second actuator of one of the two or more second actuators is a turntable swing motor of the aerial working platform.
In some embodiments, the second flow control valve comprises a speed valve.
The second aspect of the invention discloses an aerial working platform comprising any of the load-sensitive systems.
According to the load sensitive system provided by the invention, the flow loss can be reduced by adopting the load sensitive variable pump, so that the load sensitive system has good economical efficiency, and the load sensitive variable pump can be fed back quickly when the first execution device starts to act by feeding oil back through the flow path between the oil supply port of the load sensitive variable pump and the first execution device, so that the load quick response capability of the load sensitive system is improved.
The aerial work platform provided by the invention also has corresponding beneficial effects.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
Fig. 1 is a schematic structural diagram of a load-sensitive system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the load-sensitive system of the present embodiment includes an oil tank, a load-sensitive variable pump 2, a first actuator, a first flow control valve 6-2, an on-off valve 9, and a first feedback oil intake port.
The load-sensitive variable pump 2 includes an oil supply port for supplying oil to a load, an oil suction port for sucking oil from an oil tank, and a load-sensitive port for feeding back load pressure to adjust displacement. As shown in the figure, the load-sensitive variable pump 2 is driven by the motor M to absorb oil from the oil tank through the oil absorbing port, and then pumps hydraulic oil to the oil supply path P1 for load use through the oil supplying port, and the load-sensitive system further sets the feedback path LS1 to feed back load pressure to the load-sensitive variable pump 2 through the load-sensitive port so as to feed back and adjust the displacement of the load-sensitive variable pump 2.
The first executing device comprises a first executing mechanism and a first control valve connected between the first executing mechanism and the oil supply port, and the first control valve controls oil inlet and oil outlet of the first executing mechanism to control the first executing mechanism to act. The first actuating device can be one or more, and the first actuating mechanism can comprise a swinging cylinder, a telescopic cylinder, a hydraulic motor and the like. For example, in the embodiment shown in fig. 1, there are two first actuators, wherein the first actuator of one first actuator is the first swing motor 15 and the first actuator of the other first actuator is the first telescopic cylinder 13-2. The first control valve is used for controlling oil inlet and outlet of the first actuating mechanism, and the first control valve may comprise a reversing valve, a speed regulating valve, a pressure compensating valve and the like, for example, in the embodiment shown in fig. 1, the two first actuating devices both adopt pre-valve pressure compensation. The first control valve of a first actuator comprises a first electromagnetic proportional control valve 11-1 connected with a first swing motor 15 for adjusting flow and reversing, and a first pressure compensation valve 12-1 positioned in front of the first electromagnetic proportional control valve 11-1; the first control valve of the other first actuator comprises a second electromagnetic proportional control valve 11-2 connected to the first telescopic cylinder 13-2 for regulating the flow and reversing, and a second pressure compensating valve 12-2 located before the second electromagnetic proportional control valve 11-2. The first control valve controls the operation of the first actuator by controlling the oil supply of the oil supply passage P1 to the first actuator.
A first flow control valve 6-2 connected between the first actuator and the oil supply port for controlling the flow rate supplied from the oil supply port to the first actuator. The first flow control valve 6-2 may include a speed valve or a constant flow valve or the like that keeps the flow constant.
And an on-off valve 9 connected between the first flow control valve 6-2 and the first actuator for controlling the on-off of the flow path between the first flow control valve 6-2 and the first actuator. The on-off valve 9 may be a manual valve, an electromagnetic valve, a hydraulic control valve or other type of on-off valve, and in the embodiment shown in fig. 1, the on-off valve 9 is a two-position two-way electromagnetic valve, and the on-off of the on-off valve 9 is controlled by an electrical signal so as to connect or disconnect an oil supply path between the first executing device and the oil supply port.
The first feedback oil taking port is arranged on a flow path between the on-off valve 9 and the first executing device and is connected with the load sensitive port. The first feedback oil taking port takes feedback hydraulic oil out of an oil supply oil path in front of the first executing device behind the on-off valve 9 and sends the feedback hydraulic oil to the feedback oil path LS1 to carry out load feedback on the load sensitive variable pump 2. In the embodiment shown in fig. 1, the hydraulic oil is taken out from the first feedback oil taking port and then sent to the feedback oil path LS1 for feedback through the first check valve 4-4.
According to the load sensitive system of the embodiment, the load sensitive variable pump 2 is adopted to perform feedback adjustment on the displacement of the load sensitive variable pump 2 according to the flow demand of the load, so that the flow of hydraulic oil pumped by the load sensitive variable pump 2 is adapted to the demand flow of the load, the flow loss is reduced, and the system has good economical efficiency. In addition, by arranging the first flow control valve 6-2, the on-off valve 9 and the first feedback oil taking port in the flow path between the oil supply port of the load-sensitive variable pump 2 and the first executing device, the hydraulic oil pumped out of the load-sensitive variable pump 2 can enter the feedback oil path LS1 when passing through the first feedback oil taking port by operating the first control valve and opening the on-off valve 9 when the first executing device starts to act, so that the load action can be fed back to the load-sensitive variable pump 2 before the hydraulic oil enters the first executing device, the action of the first executing device can be fed back quickly, and the load quick response capability of the load-sensitive system is improved.
In some embodiments, the first actuating mechanism includes a plurality of oil ports connected with a first control valve, the first control valve controls oil feeding and discharging of the plurality of oil ports, the load-sensitive system further includes an oil discharging on-off valve 16 and a first comparison valve connected with the plurality of oil ports, the first comparison valve is used for comparing to obtain a first maximum oil pressure of the plurality of oil ports, the oil discharging on-off valve 16 is connected with a first feedback oil taking port and an oil tank, and the first comparison valve is connected with a hydraulic control port of the oil discharging on-off valve 16 to control on-off of the oil discharging on-off valve 16. As shown in fig. 1, the first comparison valve in one first actuator includes a first shuttle valve 10-2, and the first comparison valve in the other first actuator includes a second shuttle valve 10-3. In this embodiment, when the first actuator is operated, the hydraulic control port of the oil drain on-off valve 16 is controlled to maintain the oil drain on-off valve in the off state by using the first maximum oil pressure compared by the first comparison valve, so that the normal supply of the hydraulic oil from the oil supply path P1 to the first actuator is not affected to operate the first actuator. When the first actuator is not operated and the oil pressure of the plurality of oil ports is low, for example, when the load sensitive system is in an idling state, the on-off valve 9 can be kept in an open state, and the hydraulic oil from the oil supply passage P1 can be returned to the oil tank through the drain on-off valve 16. Since the opening pressure of the oil drain on-off valve 16 at the time of oil return can be set low, for example, as shown in fig. 1, a small spring force is set as the opening pressure, so that the load-sensitive system can return oil with a low oil pressure, and the energy saving performance of the system is improved. The embodiment is configured such that the oil drain on-off valve 16 is controlled by the first comparison valve through the hydraulic control port, oil supply to the first execution device is not affected when the first execution device acts, and oil return can be performed with a small oil return pressure when the system needs low-pressure oil return, so that the economical efficiency of the system is improved.
In some embodiments, as shown in fig. 1, the oil drain on-off valve 16 includes a first pilot port at one end of the valve and a second pilot port and spring at the other end of the valve, the first pilot port being connected to the oil inlet of the oil drain on-off valve 16, the second pilot port being connected to the first comparison valve such that the opening pressure of the oil drain on-off valve 16 is the sum of the first maximum oil pressure and the pressure of the spring. The pressure of the spring can be set to be lower, so that the load sensitive system can return oil by overcoming the lower spring force of the oil discharge on-off valve 16 when idle oil return is needed, and the larger opening pressure of the oil discharge on-off valve 16 is maintained when the first executing device acts, so that the oil discharge on-off valve 16 is kept in an off state so as not to influence the oil supply to the first executing device.
In some embodiments, when the load-sensitive system is applied to an aerial working platform, the first actuator of one of the two or more first actuators is a platform swing motor of the aerial working platform, and the first actuator of one of the two or more first actuators is a crank luffing cylinder of the aerial working platform. Therefore, the load sensitive system can control the platform swing motor to swing the operation platform and control the crank amplitude varying oil cylinder to vary amplitude of the crank. Because in the aerial working platform, the pipelines of the load-sensitive variable pump 2, the platform swing motor and the crank amplitude cylinder are longer and are usually larger than 20m, the load-sensitive system can help to solve the problem that the motion of the platform swing motor and the crank amplitude cylinder cannot respond in time due to the fact that the pipelines are too long when the platform swing motor and the crank amplitude cylinder move, and the motion of the platform swing motor and the crank amplitude cylinder can be fed back rapidly by arranging the first feedback oil taking port on the oil supply oil path P1.
In some embodiments, the load sensing system further includes a constant flow valve connected between the pilot port of the drain on-off valve 16 and the tank. The constant flow valve can be a speed regulating valve with a constant orifice opening. In the embodiment shown in fig. 1, the constant flow valve is a first oil drain constant flow valve 6-3, which is provided to facilitate stable and efficient oil drain of the first comparison valve of the first actuator.
In some embodiments, the load-sensitive system further comprises a second actuator and an oil supply communication port for supplying oil to the second actuator, the oil supply communication port being provided in a flow path connected to the first flow control valve 6-2 and the oil supply port, the first feedback oil intake port being located in proximity to the second actuator relative to the first actuator. The number of second actuating means may be one or more, and in the embodiment shown in fig. 1 two second actuating means are provided. According to the embodiment, the first feedback oil taking port for feeding back the action of the first executing device and the second executing device are arranged on one side close to the load-sensitive variable pump 2, and the pipeline distance between the load-sensitive system variable pump 2 and the second executing device can be kept short, so that the action of the load-sensitive system on the second executing device with a short pipeline close to the load-sensitive variable pump 2 and the action of the second executing device with a long pipeline far from the load-sensitive variable pump 2 can be fed back rapidly.
In some embodiments, the second actuator comprises a second actuator and a second flow control valve. The second actuator may be a swing cylinder, a telescopic cylinder, a swing motor, etc., and in the embodiment shown in fig. 1 there are two second actuators, the second actuator of one second actuator comprising the second telescopic cylinder 13-1 and the second actuator of the other second actuator comprising the second swing motor 14. The second flow control valve is connected between the second actuating mechanism and the oil supply port and is used for controlling the flow of hydraulic oil entering the second actuating mechanism, and an oil outlet of the second flow control valve, which is communicated with the second actuating mechanism, is connected with a flow path (namely a feedback flow path LS 1) connected between the first feedback oil taking port and the load sensitive port. In the embodiment shown in fig. 1, both second actuators use pre-valve pressure compensation. The second telescopic cylinder 13-1 is connected with the left electromagnetic directional valve 8-1 and then connected with the left second flow control valve 7-1. The second swing motor 14 is connected to the right electromagnetic directional valve 8-2 and then to the right second flow control valve 7-2. The oil supply way P1 of the load sensitive variable pump 2 supplies oil, and the oil enters the second executing mechanism through the electromagnetic reversing valve after the flow is regulated by the second flow control valve. Part of oil passing through the outlet of the second flow control valve enters a feedback oil path LS1 through a one-way valve to feed back the load sensitive variable pump 2, the feedback oil path LS1 is connected with an oil tank through a throttling device, and a second oil discharge constant flow valve 6-1 is shown in fig. 1.
In some embodiments, the second actuator of one of the two or more second actuators is a boom luffing cylinder of the aerial work platform, and the second actuator of one of the two or more second actuators is a turntable swing motor of the aerial work platform.
In some embodiments, the oil supply path P1 of the load-sensitive variable pump 2 supplies oil to the load after passing through the second one-way valve 4-1, and the load-sensitive system further comprises an overflow safety valve 5-1 connected with the load-sensitive variable pump 2, a first filtering device 1 arranged in front of an oil suction port of the load-sensitive variable pump 2, and a second filtering device 3 arranged in an oil return path close to the oil tank.
In some embodiments, the second flow control valve comprises a speed valve.
In some embodiments, an aerial work platform is provided that includes the load-sensitive system of the embodiments described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (13)
1. A load sensitive system, comprising:
An oil tank;
a load-sensitive variable pump (2) including an oil supply port for supplying oil to a load, an oil suction port for sucking oil from the oil tank, and a load-sensitive port for feeding back load pressure to adjust displacement;
The first actuating device comprises a first actuating mechanism and a first control valve connected between the first actuating mechanism and the oil supply port, the first control valve controls oil inlet and oil outlet of the first actuating mechanism to control the first actuating mechanism to act, and the first actuating mechanism comprises a swinging cylinder, a telescopic cylinder or a hydraulic motor;
a first flow control valve (6-2) connected between the first actuator and the oil supply port for controlling the flow rate supplied from the oil supply port to the first actuator;
An on-off valve (9) connected between the first flow control valve (6-2) and the first actuator for controlling on-off of a flow path between the first flow control valve (6-2) and the first actuator;
the first feedback oil taking port is arranged on a flow path between the on-off valve (9) and the first executing device and is connected with the load sensitive port;
The first actuating mechanism comprises a plurality of oil ports connected with the first control valve, the first control valve controls oil inlet and exhaust of the plurality of oil ports, the load sensitive system further comprises an oil exhaust on-off valve (16) and a first comparison valve connected with the plurality of oil ports, the first comparison valve is used for comparing and obtaining first maximum oil pressure of the plurality of oil ports, the oil exhaust on-off valve (16) is connected with the first feedback oil extraction port and the oil tank, and the first comparison valve is connected with a hydraulic control port of the oil exhaust on-off valve (16) to control on-off of the oil exhaust on-off valve (16).
2. Load sensing system according to claim 1, wherein the first flow control valve (6-2) comprises a speed valve or a constant flow valve.
3. Load sensing system according to claim 1, wherein the on-off valve (9) is a two-position two-way solenoid valve.
4. The load sensing system of claim 1, wherein the oil drain on-off valve (16) includes a first pilot port at one end of the valve and a second pilot port at the other end of the valve and a spring, the first pilot port being connected to an oil inlet of the oil drain on-off valve (16), the second pilot port being connected to the first comparison valve such that an opening pressure of the oil drain on-off valve (16) is a sum of the first maximum oil pressure and a pressure of the spring.
5. The load sensing system of claim 1, wherein the load sensing system comprises more than two of the first actuators.
6. The load sensing system of claim 4, wherein the first actuator of one of the two or more first actuators is a platform swing motor of an aerial work platform and the first actuator of one of the first actuators is a crank horn cylinder of the aerial work platform.
7. The load sensing system of claim 1, further comprising a constant flow valve connected between a pilot port of the drain on-off valve (16) and the tank.
8. The load sensing system according to any one of claims 1 to 7, further comprising a second actuator and an oil supply communication port for supplying oil to the second actuator, the oil supply communication port being provided in a flow path connected to the first flow control valve (6-2) and the oil supply port, the first feedback oil intake port being located close to the second actuator with respect to the first actuator.
9. The load sensing system of claim 8, wherein the second performing means comprises:
A second actuator; and
The second flow control valve is connected between the second executing mechanism and the oil supply port and is used for controlling the flow of hydraulic oil entering the second executing mechanism, and an oil outlet of the second flow control valve, which is communicated with the second executing mechanism, is connected with a flow path connected between the first feedback oil taking port and the load sensitive port.
10. The load sensing system of claim 9, wherein the load sensing system comprises two or more of the second actuators.
11. The load sensing system of claim 10, wherein the second actuator of one of the two or more second actuators is a boom luffing cylinder of an aerial work platform and the second actuator of one of the second actuators is a turntable swing motor of the aerial work platform.
12. The load sensing system of claim 9, wherein the second flow control valve comprises a speed valve.
13. An aerial work platform comprising a load sensitive system as claimed in any one of claims 1 to 12.
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| CN201910078915.7A CN109578352B (en) | 2019-01-28 | 2019-01-28 | Load-sensitive system and aerial work platform |
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| CN201910078915.7A CN109578352B (en) | 2019-01-28 | 2019-01-28 | Load-sensitive system and aerial work platform |
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| CN116557370A (en) * | 2023-07-06 | 2023-08-08 | 徐工消防安全装备有限公司 | Work platform control system and aerial work platform equipment |
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|---|---|---|---|---|
| CN102588357A (en) * | 2011-12-20 | 2012-07-18 | 徐州重型机械有限公司 | Load sensitive hydraulic system and crane with hydraulic system |
| CN102720711A (en) * | 2012-06-29 | 2012-10-10 | 武汉船用机械有限责任公司 | Automatic-switch type load sensing hydraulic system |
| CN203114773U (en) * | 2013-03-12 | 2013-08-07 | 长沙中联消防机械有限公司 | Hydraulic feedback device and engineering machinery |
| CN209671293U (en) * | 2019-01-28 | 2019-11-22 | 徐工消防安全装备有限公司 | Load sensitive system and aerial work platform |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5394284B2 (en) * | 2010-02-25 | 2014-01-22 | 株式会社小松製作所 | Load pressure sensitive hydraulic circuit |
| CN203297181U (en) * | 2013-04-03 | 2013-11-20 | 长沙中联消防机械有限公司 | load sensing system |
| CN104405708B (en) * | 2014-09-18 | 2016-06-29 | 广西柳工机械股份有限公司 | Load-sensitive analog valve and loader load-reacting system |
| US20180319634A1 (en) * | 2014-10-30 | 2018-11-08 | Xuzhou Heavy Machinery Co., Ltd. | Crane hydraulic system and controlling method of the system |
| CN205533473U (en) * | 2015-12-30 | 2016-08-31 | 徐州重型机械有限公司 | Sensitive feedback oil circuit structure of load and sensitive hydraulic system of load |
| CN207598900U (en) * | 2017-12-06 | 2018-07-10 | 盛瑞传动股份有限公司 | Hydraulic gear-shifting system with flow stabilization apparatus |
| CN207762060U (en) * | 2017-12-26 | 2018-08-24 | 长沙天盾重工有限责任公司 | A kind of overhead working truck system |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588357A (en) * | 2011-12-20 | 2012-07-18 | 徐州重型机械有限公司 | Load sensitive hydraulic system and crane with hydraulic system |
| CN102720711A (en) * | 2012-06-29 | 2012-10-10 | 武汉船用机械有限责任公司 | Automatic-switch type load sensing hydraulic system |
| CN203114773U (en) * | 2013-03-12 | 2013-08-07 | 长沙中联消防机械有限公司 | Hydraulic feedback device and engineering machinery |
| CN209671293U (en) * | 2019-01-28 | 2019-11-22 | 徐工消防安全装备有限公司 | Load sensitive system and aerial work platform |
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