CN219711921U

CN219711921U - Hydraulic device synchronously driven by multiple multi-stage hydraulic cylinders

Info

Publication number: CN219711921U
Application number: CN202321038259.6U
Authority: CN
Inventors: 刘伟龙
Original assignee: Hunan Lyuyi Huamei Environmental Protection Technology Co ltd
Current assignee: Hunan Lyuyi Huamei Environmental Protection Technology Co ltd
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-09-19
Anticipated expiration: 2033-05-05

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic device synchronously driven by a plurality of multistage hydraulic cylinders. The reversing valve is communicated with the oil supply mechanism; the rod cavity oil ports of the multiple multi-stage hydraulic cylinders are connected with the reversing valve in parallel; the rodless cavity oil ports of the multiple multi-stage hydraulic cylinders are connected in parallel with a first one-way valve, and the first one-way valve is communicated with a reversing valve; the back pressure mechanism is connected with the first one-way valve in parallel; the back pressure mechanism comprises a first overflow valve and an electromagnetic valve which are connected in parallel; when the electromagnetic valve is closed, the oil circuit can be cut off, so that a plurality of multi-stage hydraulic cylinders can bear back pressure at the same time. When the electromagnetic valve is closed, the pressure of oil in the oil port of the rodless cavity is continuously increased, a plurality of multi-stage hydraulic cylinders can bear back pressure with consistent size and consistent direction at the same time in a parallel connection mode, and the plurality of multi-stage hydraulic cylinders can synchronously discharge the cylinders through the applied back pressure, so that the synchronism error is greatly reduced.

Description

Hydraulic device synchronously driven by multiple multi-stage hydraulic cylinders

Technical Field

The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic device synchronously driven by a plurality of multistage hydraulic cylinders.

Background

Multiple hydraulic cylinders are typically used to synchronously drive the load in linear motion to enhance operational stability and propulsion. The multistage hydraulic cylinder can perform multistage piston movement so as to prolong the working stroke, and is suitable for occasions with limited installation space and higher stroke requirements.

However, a plurality of hydraulic cylinders are easy to generate larger synchronism errors during idle operation, abnormal movement is generated, and even structural parts are damaged. At present, the synchronicity of a plurality of single-stage hydraulic cylinders is often ensured by adopting a flow distributing and collecting valve, but in the repeated telescoping process of the hydraulic cylinders, the error of the oil inlet amount and the oil outlet amount is continuously increased, and especially when the flow distributing and collecting valve is applied to a plurality of multi-stage hydraulic cylinders, the synchronicity error is larger.

When a plurality of hydraulic cylinders run empty, the conditions such as manufacturing errors, clearance fit of sealing rings, abrasion, flow difference or pressure difference can cause that the plurality of hydraulic cylinders are out of synchronization, namely the out-of-cylinder speed is inconsistent, the synchronism error is larger, synchronous driving is difficult to achieve, the expansion and contraction amounts of the plurality of hydraulic cylinders are inconsistent, equipment abrasion and damage are easy to be aggravated, the service life of equipment is influenced, and meanwhile, the stable pushing or extrusion of a load is difficult to achieve, so that the use effect is poor.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and drawbacks of the prior art, the present utility model provides a hydraulic device with multiple hydraulic cylinders driven synchronously, which solves the technical problem of large synchronization error in the operation of the existing multiple hydraulic cylinders.

(II) technical scheme

In order to achieve the above object, a hydraulic device for synchronously driving a plurality of multi-stage hydraulic cylinders according to the present utility model includes:

an oil supply mechanism;

the reversing valve is communicated with the oil supply mechanism;

the rod cavity oil ports of the multistage hydraulic cylinders are connected with the reversing valve in parallel;

the rodless cavity oil ports of the multi-stage hydraulic cylinders are connected with the first one-way valve in parallel, and the first one-way valve is communicated with the reversing valve;

a back pressure mechanism connected in parallel with the first one-way valve; the back pressure mechanism comprises a first overflow valve and an electromagnetic valve which are connected in parallel; when the electromagnetic valve is closed, the oil way can be cut off, so that a plurality of multistage hydraulic cylinders bear back pressure at the same time.

Optionally, the reversing valve is provided with an A-bit oil inlet, an A-bit oil outlet, a B-bit oil inlet and a B-bit oil outlet;

the B-bit oil inlet is communicated with the back pressure mechanism and the first one-way valve; the B-bit oil outlet and the A-bit oil inlet are communicated with the oil supply mechanism; the A-position oil outlet is communicated with a plurality of multi-stage hydraulic cylinders.

Optionally, the reversing valve includes a first working state and a second working state that can be switched to each other;

in the first working state, the A-position oil inlet is communicated with the A-position oil outlet, and the B-position oil inlet is communicated with the B-position oil outlet;

and in the second working state, the A-bit oil inlet is communicated with the B-bit oil inlet, and the A-bit oil outlet is communicated with the B-bit oil outlet.

Alternatively, the first relief valve can be a pilot relief valve.

Optionally, the hydraulic device further comprises a second relief valve;

the second overflow valve is arranged between the oil supply mechanism and the reversing valve.

Optionally, the hydraulic device further comprises a second one-way valve;

the second one-way valve is arranged between the oil supply mechanism and the reversing valve and is connected with the second overflow valve in parallel.

Optionally, a positive pressure gauge is arranged between the second overflow valve and the reversing valve.

Optionally, the oil supply mechanism comprises an oil tank, an oil pump and a motor;

the oil pump is electrically connected with the motor;

the oil tank is communicated with the oil pump, and the oil pump is communicated with the reversing valve.

Optionally, a back pressure gauge is arranged between the back pressure mechanism and the rodless cavity oil ports.

(III) beneficial effects

The beneficial effects of the utility model are as follows: the rod cavity oil ports of the multiple multi-stage hydraulic cylinders are connected with the reversing valve in parallel. The synchronous driving of the multiple multistage hydraulic cylinders can enhance the propelling force and propelling stability to the load, can be applied to occasions with limited installation space and higher stroke requirements, and has higher adaptability. Extension and retraction of a plurality of multistage hydraulic cylinders can be realized by arranging the reversing valve to be matched with the oil supply mechanism, an external oil pump is not required to be additionally arranged for pumping oil to the rodless cavity oil port, and equipment cost is saved.

When the electromagnetic valve is closed, the oil circuit can be cut off, so that a plurality of multi-stage hydraulic cylinders can bear back pressure at the same time. When the solenoid valve is closed, the oil in the rodless cavity oil ports of the multistage hydraulic cylinders is blocked between the rodless cavity oil ports and the reversing valve, and along with the pressurization of the oil supply mechanism, the pressure of the oil in the rodless cavity oil ports is continuously increased, namely the back pressure is continuously increased, the multistage hydraulic cylinders can bear the back pressure with consistent size and consistent direction simultaneously in a parallel mode, and the multistage hydraulic cylinders can synchronously discharge the cylinders through the applied back pressure, so that the synchronism error is greatly reduced.

The first relief valve is connected in parallel with the solenoid valve. When the back pressure is equal to or greater than the valve port threshold value set by the first overflow valve, the first overflow valve is conducted to adjust the maximum pressure in the rodless cavity oil port pipeline, so that the pipeline and equipment are effectively protected. By setting the valve port threshold value of the first overflow valve, the back pressure can be correspondingly set, and the adaptability to synchronous driving of various and multi-size hydraulic cylinders is improved.

The rodless cavity oil ports of the multiple multi-stage hydraulic cylinders are connected in parallel with a first one-way valve, the first one-way valve is communicated with a reversing valve, and the back pressure mechanism is connected in parallel with the first one-way valve. The first one-way valve blocks the pipeline when the oil in the oil port of the rodless cavity is discharged, so that oil can only flow to the back pressure mechanism; the pipeline is opened to first check valve when rodless chamber hydraulic fluid port advances oil to can shield backpressure mechanism, fluid can directly flow to switching-over valve, first check valve, rodless chamber hydraulic fluid port from oil feeding mechanism, make the return stroke of a plurality of multistage pneumatic cylinders not receive backpressure mechanism's influence, need not to additionally regulate and control backpressure mechanism again, reduce backpressure mechanism's setting cost.

Drawings

FIG. 1 is a schematic diagram of a hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders according to the present utility model;

FIG. 2 is a schematic diagram of a reversing valve according to the present utility model;

fig. 3 is a schematic structural view of the back pressure mechanism of the present utility model.

[ reference numerals description ]

1: an oil pump; 2: a motor; 3: a second overflow valve; 4: a positive pressure gauge; 5: an oil tank; 6: a reversing valve; 7: a first overflow valve; 8: a first one-way valve; 9: a back pressure gauge; 10: a multi-stage hydraulic cylinder; 11: the oil port of the rod cavity is arranged; 12: an oil port of the rodless cavity; 13: an electromagnetic valve; 14: a back pressure pipe;

a1: a position A oil inlet; a2: an A-position oil outlet; b1: b-bit oil inlet; b2: and B is an oil outlet.

Detailed Description

The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; "coupled" may be mechanical or electrical; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, the present utility model provides a hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders, the hydraulic device comprising an oil supply mechanism, a reversing valve 6, a plurality of multi-stage hydraulic cylinders 10, a first check valve 8 and a back pressure mechanism. The reversing valve 6 is communicated with the oil supply mechanism; the rod cavity oil ports 11 of the multiple multi-stage hydraulic cylinders 10 are connected with the reversing valve 6 in parallel; the rodless cavity oil ports 12 of the multiple multi-stage hydraulic cylinders 10 are connected in parallel with the first one-way valve 8, and the first one-way valve 8 is communicated with the reversing valve 6; the back pressure mechanism is connected with the first one-way valve 8 in parallel; the back pressure mechanism comprises a first overflow valve 7 and an electromagnetic valve 13 which are connected in parallel; when the solenoid valve 13 is closed, the oil passage can be cut off, and the plurality of multistage hydraulic cylinders 10 can simultaneously receive back pressure.

The rod cavity oil ports 11 of the multiple multi-stage hydraulic cylinders 10 are connected with the reversing valve 6 in parallel. The synchronous driving of the multiple multistage hydraulic cylinders 10 can enhance the propelling force and propelling stability to the load, and can be applied to occasions with limited installation space and higher stroke requirements, and the adaptability is higher. Extension and retraction of a plurality of multi-stage hydraulic cylinders 10 can be realized by arranging the reversing valve 6 and matching with an oil supply mechanism, and an external oil pump is not required to be additionally arranged for pumping oil to the rodless cavity oil port 12, so that equipment cost is saved.

When the solenoid valve 13 is closed, the oil passage can be cut off, and the plurality of multistage hydraulic cylinders 10 can simultaneously receive back pressure. When the electromagnetic valve 13 is closed, the oil in the rodless cavity oil ports 12 of the multiple multi-stage hydraulic cylinders 10 is blocked between the rodless cavity oil ports 12 and the reversing valve 6, and along with the pressurization of the oil supply mechanism, the pressure of the oil in the rodless cavity oil ports 12 is continuously increased, namely the back pressure is continuously increased, the multiple multi-stage hydraulic cylinders 10 can bear the back pressure with consistent size and consistent direction at the same time in a parallel connection mode, and the multiple multi-stage hydraulic cylinders 10 can synchronously discharge cylinders through the applied back pressure, so that the synchronism error is greatly reduced.

The first relief valve 7 is connected in parallel with the solenoid valve 13. When the back pressure is equal to or greater than the valve port threshold value set by the first overflow valve 7, the first overflow valve 7 is conducted to adjust the maximum pressure in the pipeline of the rodless cavity oil port 12, so that the pipeline and equipment are effectively protected. By setting the valve port threshold value of the first overflow valve 7, the back pressure can be correspondingly set, and the adaptability to synchronous driving of various and multi-size hydraulic cylinders is improved.

The rodless cavity oil ports 12 of the multiple multi-stage hydraulic cylinders 10 are connected in parallel with the first one-way valve 8, the first one-way valve 8 is communicated with the reversing valve 6, and the back pressure mechanism is connected in parallel with the first one-way valve 8. The first one-way valve 8 blocks a pipeline when the oil is discharged from the rodless cavity oil port 12, so that oil can only flow to the back pressure mechanism; the pipeline is opened to first check valve 8 when rodless chamber hydraulic fluid port 12 advances to can shield backpressure mechanism, fluid can directly flow to switching-over valve 6, first check valve 8, rodless chamber hydraulic fluid port 12 from oil feeding mechanism, make the return stroke of a plurality of multistage pneumatic cylinders 10 not receive backpressure mechanism's influence, need not to additionally regulate and control backpressure mechanism again, reduced backpressure mechanism's setting cost.

In this embodiment, the electromagnetic valve 13 is a two-position two-way valve, which includes two working states of an open valve and a close valve. The back pressure mechanism is that in the initial stage before the extension of the multiple multi-stage hydraulic cylinders 10, the electromagnetic valve 13 is closed, the oil of the rodless cavity oil port 12 is blocked between the rodless cavity oil port 12 and the back pressure mechanism, so that back pressure can be generated, the back pressure acts on the multiple multi-stage hydraulic cylinders 10, the direction of positive pressure acting on the multiple multi-stage hydraulic cylinders 10 by the oil supply mechanism is opposite, the multiple multi-stage hydraulic cylinders 10 are connected in parallel, the multiple multi-stage hydraulic cylinders 10 can receive back pressure with consistent size and consistent direction, the telescopic rods of the multiple multi-stage hydraulic cylinders 10 can be understood to be limited by a baffle plate, and the baffle plate is perpendicular to the axial direction of the telescopic rods of the hydraulic cylinders 10, and the synchronous adjustment of the multiple multi-stage hydraulic cylinders 10 is completed until all the telescopic rods of the multiple multi-stage hydraulic cylinders 10 are abutted with the baffle plate. When the back pressure is equal to or greater than the valve port threshold of the first relief valve 7, the first relief valve 7 is conducted, the oil flows to the oil supply mechanism through the first relief valve 7 and the reversing valve 6, and the plurality of multi-stage hydraulic cylinders 10 start to be propelled. The arrangement of the back pressure mechanism ensures the consistency of the cylinder outlet of the multi-stage hydraulic cylinders 10 and greatly reduces the synchronization error.

The oil supply mechanism, the reversing valve 6, the multiple multi-stage hydraulic cylinders 10, the back pressure mechanism and other devices can be manually adjusted by manpower or automatically adjusted. In this embodiment, the hydraulic device further includes a control center, and the control center is electrically connected to the oil supply mechanism, the reversing valve 6, the plurality of multi-stage hydraulic cylinders 10, and the back pressure mechanism correspondingly, so as to realize efficient operation of the hydraulic device. The length of time and the pressure of back pressure applied by the back pressure mechanism can be adjusted through the control center, the back pressure is set through setting the valve port threshold value of the first overflow valve 7, the length of time is set through adjusting the positive pressure of the oil supply mechanism, and the back pressure is correspondingly set according to actual requirements, so that a reaction force can be applied to the multi-stage hydraulic cylinders 10 in the preliminary starting stage of the multi-stage hydraulic cylinders 10, a certain back pressure is born in the extending process of the multi-stage hydraulic cylinders 10, and the purpose of synchronously discharging the multi-stage hydraulic cylinders 10 is achieved. The circuit connection and logic control mode of the control center are the prior art, and the utility model is not developed in detail.

As shown in fig. 2, the reversing valve 6 comprises an a-bit oil inlet A1, an a-bit oil outlet A2, a B-bit oil inlet B1 and a B-bit oil outlet B2; the B-position oil inlet B1 is communicated with the back pressure mechanism, and the B-position oil inlet B1 is communicated with the back pressure mechanism and the first one-way valve 8; the B-position oil outlet B2 and the A-position oil inlet A1 are communicated with an oil supply mechanism; the A-position oil outlet A2 is communicated with a plurality of multi-stage hydraulic cylinders 10. The reversing valve 6 can change the flow direction of the oil way, for example, the A-position oil outlet A2 before the reversing is an oil outlet end, and the A-position oil outlet A2 after the reversing is an oil inlet end, so that the oil inlet or the oil discharge of a rod cavity (or a rodless cavity) of the multi-stage hydraulic cylinder 10 is realized, and the propulsion or the return stroke of the multi-stage hydraulic cylinder 10 is further realized.

Further, the reversing valve 6 includes a first operating state and a second operating state that can be switched to each other; in the first working state, the A-bit oil inlet A1 is communicated with the A-bit oil outlet A2, and the B-bit oil inlet B1 is communicated with the B-bit oil outlet B2; in the second working state, the A-bit oil inlet A1 is communicated with the B-bit oil inlet B1, and the A-bit oil outlet A2 is communicated with the B-bit oil outlet B2. In the embodiment, the reversing valve 6 is a three-position four-way reversing valve, namely, the valve core of the reversing valve 6 has three working stations, including a station A, a stationary station and a station B; the first working state corresponds to the station A, and the second working state corresponds to the station B; the static station is a circuit breaking station, and the A-position oil inlet A1, the A-position oil outlet A2, the B-position oil inlet B1 and the B-position oil outlet B2 are not communicated with each other under the static station, and the reversing valve 6 is opened, so that the pressure maintaining effect on the multiple multistage hydraulic cylinders 10 can be achieved.

Referring to fig. 1 and 3, when the reversing valve 6 is in the station a, the first check valve 8 blocks the branch, the electromagnetic valve 13 is in a normally closed state, the valve port of the first relief valve 7 is not opened, so that the oil at the rodless cavity oil port 12 cannot flow to the oil supply mechanism, the pressure of the pipeline in the rodless cavity oil port 12 increases along with the increase of the positive pressure of the oil supply mechanism, when the pressure of the pipeline in the rodless cavity oil port 12 increases to be equal to or greater than the valve port threshold value of the first relief valve 7, the valve port of the first relief valve 7 is flushed, the first relief valve 7 is conducted, the oil in the rodless cavity oil port 12 can flow to the oil supply mechanism through the back pressure pipe 14 of the first relief valve 7 and the reversing valve 6, and the plurality of multi-stage hydraulic cylinders 10 start to advance. In addition, in the pushing process of the multiple hydraulic cylinders 10, the pushing or extrusion of the multiple hydraulic cylinders 10 to the external load may be affected due to the continuous back pressure effect, so that the electromagnetic valve 13 can be opened in the pushing process, at this time, the electromagnetic valve 13 can be regarded as being communicated with the oil supply mechanism, and the pressure in the pipeline is zero, so that the electromagnetic valve 13 can shield the first overflow valve 7, and the pushing process of the multiple hydraulic cylinders 10 is not affected by the first overflow valve 7, namely, is not affected by the back pressure any more, and can be normally pushed. The valve opening time from the opening of the first relief valve 7 to the opening of the solenoid valve 13 can be controlled by the control center.

When the reversing valve 6 is at the station B, oil flows from the oil supply mechanism and the B-position oil inlet B1 to the back pressure mechanism, at the moment, the first one-way valve 8 works normally, the branch is opened, the back pressure mechanism can be shielded, and the oil can flow to the rodless cavity oil port 12 through the first one-way valve 8. The first relief valve 7 is normally only activated for a certain time in the initial stage of extension of the multi-stage hydraulic cylinder 10, after which the multi-stage hydraulic cylinder 10 is deactivated by power cut, and the extension and propulsion of the multi-stage hydraulic cylinder 10 are continued, so that the first relief valve 7 is not activated when the multi-stage hydraulic cylinder 10 is returned. Of course, for the multistage hydraulic cylinder 10, because the telescopic path is longer, the back pressure mechanism can be started for multiple times and the positive pressure of the oil supply mechanism can be correspondingly regulated, namely, the back pressure is intermittently applied for multiple times, the cylinder outlet consistency in the pushing process of the multistage hydraulic cylinder 10 is ensured, and the synchronization error is greatly reduced.

In an embodiment, the hydraulic device is arranged in the garbage compression cavity, a pushing shovel is slidably connected in the garbage compression cavity, and the telescopic rods of the multiple multi-stage hydraulic cylinders 10 are connected with the pushing shovel to synchronously drive the pushing shovel to move, so that garbage in the garbage compression cavity is compressed into blocks, and the garbage is convenient to transport subsequently. Before compressing garbage, the garbage in the garbage compression cavity is dispersed, the pressure applied to the push shovel is unevenly distributed, if the multi-stage hydraulic cylinders 10 are directly started to push, the situation that the cylinder is out of sync possibly exists among the multi-stage hydraulic cylinders 10, the compression quality of the massive garbage can be affected finally, the compression degree of each part of the garbage is different, the garbage is easy to loosen, and the service life of equipment can be greatly affected by the fact that the cylinder is out of sync. Based on the above, in the initial stage of starting the multiple multi-stage hydraulic cylinders 10, the back pressure is manually applied to counter-impact with the positive pressure provided by the oil pumping mechanism and the second overflow valve 3, so that the multiple multi-stage hydraulic cylinders 10 bear the back pressure with the same size and direction, the consistency of the positions of the pistons or push rods in the multiple multi-stage hydraulic cylinders 10 can be ensured before the multiple multi-stage hydraulic cylinders 10 are propelled, the push shovel is pushed to the position vertical to the axial direction of the multiple multi-stage hydraulic cylinders 10, and finally the compression quality of the massive garbage can be ensured.

The first relief valve 7 may be a pilot relief valve. The pilot operated relief valve is capable of withstanding greater pressures than conventional relief valves to accommodate a greater power, greater number of multi-stage hydraulic cylinders 10.

Further, the hydraulic device also comprises a second overflow valve 3; the second relief valve 3 is arranged between the oil supply and the reversing valve 6. The second overflow valve 3 can play a role in overflow, and control the maximum pressure in the pipeline, namely the maximum positive pressure applied to the multiple multi-stage hydraulic cylinders 10 by the oil supply mechanism, so that the condition that the pipeline or equipment is damaged due to overlarge opening power of the oil supply mechanism can be effectively avoided.

Preferably, the hydraulic device further comprises a second one-way valve; the second one-way valve is arranged between the oil supply mechanism and the reversing valve 6 and is connected with the second overflow valve 3 in parallel. The second one-way valve can prevent the oil in the pipeline with the rod cavity oil port 11 from flowing backwards, plays a role in pressure maintaining, and provides stable positive pressure for the multiple multi-stage hydraulic cylinders 10. Simultaneously, the second one-way valve is connected with the second overflow valve 3 in parallel, and the maximum pressure in the pipeline is controlled through the second overflow valve 3.

Next, a positive pressure gauge 4 is provided between the second relief valve 3 and the reversing valve 6. The positive pressure gauge 4 can adopt the existing water pressure sensor to measure to can show the pressure in the A position oil inlet A1 pipeline in real time, and transmit the measured pressure value to control center, with feeding back the regulation of second overflow valve 3, improve the monitoring accuracy to the water pressure in the A position oil inlet A1 pipeline.

In addition, the oil supply mechanism comprises an oil tank 5, an oil pump 1 and a motor 2; the oil pump 1 is electrically connected with the motor 2; the oil tank 5 is communicated with the oil pump 1, and the oil pump 1 is communicated with the reversing valve 6. The motor 2 is used for driving the oil pump 1 to work and providing power for the hydraulic device. The oil can sequentially enter the rod cavity oil port 11 through the oil pump 1, the second one-way valve and the reversing valve 6 to drive the multistage hydraulic cylinder 10 to extend, so as to push or squeeze an external load.

Further, a back pressure gauge 9 is provided between the back pressure mechanism and the plurality of rodless chamber oil ports 12. Similarly, the back pressure gauge 9 is the same as the positive pressure gauge 4, and can monitor the water pressure in the pipeline. The back pressure gauge 9 is used for monitoring the pressure in the pipeline of the rodless cavity oil port 12 and transmitting the detection value to the control center so as to feed back the adjustment of the first overflow valve 7, improve the monitoring precision of the water pressure in the pipeline of the rodless cavity oil port 12, ensure the back pressure effect and further ensure the consistency of the cylinder outlet speeds of the plurality of multistage hydraulic cylinders 10.

In addition, the adjustment method of the hydraulic device in which the plurality of multistage hydraulic cylinders 10 are synchronously driven is as follows:

the valve port threshold value of the first overflow valve 7 is regulated, so that the pressure of the rodless cavity oil port 12 is controlled; closing the electromagnetic valve 13;

starting the motor 2, and enabling oil to flow from the oil tank 5 to a plurality of rod cavity oil ports 11 sequentially through the oil pump 1, the A-position oil inlet A1 and the A-position oil outlet A2; meanwhile, the oil pressure in the rodless cavity oil port 12 is continuously increased until the oil pressure is equal to or greater than the valve port threshold value of the first overflow valve 7, the first overflow valve 7 is conducted, and the oil in the rodless cavity oil port 12 flows to the oil tank 5 through the first overflow valve 7, the B-position oil inlet B1 and the B-position oil outlet B2 in sequence;

after the preset time, the electromagnetic valve 13 is opened, the oil in the rodless cavity oil port 12 flows to the oil tank 5 through the electromagnetic valve 13, the B-position oil inlet B1 and the B-position oil outlet B2 in sequence, and the plurality of multi-stage hydraulic cylinders 10 are normally propelled.

The working state of the hydraulic mechanism is that when the multiple multi-stage hydraulic cylinders 10 extend, when the multiple multi-stage hydraulic cylinders 10 return, the reversing valve 6 is shifted to the station B, and at the moment, oil in the oil tank 5 flows to the rodless cavity oil port 12 through the oil pump 1, the second one-way valve (and the second overflow valve 3), the A-position oil inlet A1, the B-position oil inlet B1 and the first one-way valve 8 in sequence so as to drive the multi-stage hydraulic cylinders 10 to retract; meanwhile, oil in the oil port 11 of the rod cavity flows back to the oil tank 5 through the A-position oil outlet A2 and the B-position oil outlet B2 in sequence.

In the embodiment with longer telescopic stroke of the multi-stage hydraulic cylinder 10, the control center can control the electromagnetic valve 13 to be switched on and off at certain time intervals, for example, back pressure is applied once for T1 seconds, so that when a plurality of multi-stage hydraulic cylinders 10 are propelled on a longer stroke, the synchronization error can be reduced through multiple back pressure adjustment.

When the multistage hydraulic cylinder 10 does not need back pressure adjustment, the valve port of the electromagnetic valve 13 can be set to be in a normally open state, the electromagnetic valve 13 can be regarded as shielding the first overflow valve 7, and oil in the rodless cavity oil port 12 can flow to the reversing valve 6 and the oil tank 5 through the electromagnetic valve 13, so that normal propulsion of the multistage hydraulic cylinders 10 is not affected.

By closing the solenoid valve 13 once or a plurality of times, the expansion and contraction amount of the multi-stage hydraulic cylinders 10 can be adjusted once or a plurality of times, the consistency of the cylinder outlet is finally ensured, and the synchronization error of the multi-stage hydraulic cylinders 10 is greatly reduced.

It should be understood that the above description of the specific embodiments of the present utility model is only for illustrating the technical route and features of the present utility model, and is for enabling those skilled in the art to understand the present utility model and implement it accordingly, but the present utility model is not limited to the above-described specific embodiments. All changes or modifications that come within the scope of the appended claims are intended to be embraced therein.

Claims

1. A hydraulic device for synchronously driving a plurality of multi-stage hydraulic cylinders, the hydraulic device comprising:

an oil supply mechanism;

a reversing valve (6), the reversing valve (6) being in communication with the oil supply mechanism;

the hydraulic system comprises a plurality of multi-stage hydraulic cylinders (10), wherein rod cavity oil ports (11) of the multi-stage hydraulic cylinders (10) are connected with reversing valves (6) in parallel;

the rodless cavity oil ports (12) of the multiple hydraulic cylinders (10) are connected with the first one-way valves (8) in parallel, and the first one-way valves (8) are communicated with the reversing valves (6);

a back pressure mechanism connected in parallel with the first one-way valve (8); the back pressure mechanism comprises a first overflow valve (7) and an electromagnetic valve (13) which are connected in parallel; when the electromagnetic valve (13) is closed, an oil passage can be cut off, so that the plurality of multistage hydraulic cylinders (10) can bear back pressure at the same time.

2. The hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders according to claim 1, wherein the reversing valve (6) is provided with an a-bit oil inlet (A1), an a-bit oil outlet (A2), a B-bit oil inlet (B1) and a B-bit oil outlet (B2);

the B-bit oil inlet (B1) is communicated with the back pressure mechanism and the first one-way valve (8); the B-position oil outlet (B2) and the A-position oil inlet (A1) are communicated with the oil supply mechanism; the A-position oil outlet (A2) is communicated with a plurality of multi-stage hydraulic cylinders (10).

3. The hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders according to claim 2, characterized in that the reversing valve (6) comprises a first operating state and a second operating state which can be switched to each other;

in the first working state, an A-position oil inlet (A1) is communicated with an A-position oil outlet (A2), and a B-position oil inlet (B1) is communicated with a B-position oil outlet (B2);

and in the second working state, the A-bit oil inlet (A1) is communicated with the B-bit oil inlet (B1), and the A-bit oil outlet (A2) is communicated with the B-bit oil outlet (B2).

4. A hydraulic device driven synchronously by a plurality of hydraulic cylinders according to any one of claims 1-3, characterized in that the first relief valve (7) can be a pilot relief valve.

5. A hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders according to any one of claims 1-3, characterized in that the hydraulic device further comprises a second relief valve (3);

the second overflow valve (3) is arranged between the oil supply mechanism and the reversing valve (6).

6. The hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders of claim 5, further comprising a second check valve;

the second one-way valve is arranged between the oil supply mechanism and the reversing valve (6) and is connected with the second overflow valve (3) in parallel.

7. The hydraulic device driven synchronously by a plurality of multi-stage hydraulic cylinders according to claim 5, characterized in that a positive pressure gauge (4) is arranged between the second overflow valve (3) and the reversing valve (6).

8. A hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders according to any one of claims 1-3, characterized in that the oil supply mechanism comprises an oil tank (5), an oil pump (1) and a motor (2);

the oil pump (1) is electrically connected with the motor (2);

the oil tank (5) is communicated with the oil pump (1), and the oil pump (1) is communicated with the reversing valve (6).

9. A hydraulic device synchronously driven by a plurality of multi-stage hydraulic cylinders according to any one of claims 1-3, characterized in that a back pressure gauge (9) is arranged between the back pressure mechanism and the plurality of rodless chamber oil ports (12).