CN207349204U - A kind of flow regeneration test device of engineering machinery operating cylinder - Google Patents
A kind of flow regeneration test device of engineering machinery operating cylinder Download PDFInfo
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- CN207349204U CN207349204U CN201721353482.4U CN201721353482U CN207349204U CN 207349204 U CN207349204 U CN 207349204U CN 201721353482 U CN201721353482 U CN 201721353482U CN 207349204 U CN207349204 U CN 207349204U
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- 230000008929 regeneration Effects 0.000 title claims abstract description 126
- 238000011069 regeneration method Methods 0.000 title claims abstract description 126
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims abstract description 37
- 238000010276 construction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 16
- 239000002828 fuel tank Substances 0.000 abstract 3
- 239000012492 regenerant Substances 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 238000004088 simulation Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 82
- 238000010586 diagram Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
A kind of flow the utility model discloses engineering machinery operating cylinder regenerates test device, wherein, first hydraulic pump of flow regenerative system is connected by regeneration valve with the big chamber of operating cylinder, pass through regeneration valve unilaterally connected between the big chamber and small chamber of operating cylinder, realize that flow regenerates, the small chamber for working at the same time oil cylinder is back to fuel tank by regeneration valve；Piston rod telescopic location sensor is installed on operating cylinder, valve core displacement sensor is installed on regeneration valve, the oil return opening of regeneration valve is to being provided with flow sensor between fuel tank；Second hydraulic pump of loading system is connected with one of oil pocket of load cylinder, and the loading direction of load cylinder and the operative orientation of operating cylinder are on the contrary, overflow valve is connected in parallel between the second hydraulic pump and load cylinder, and is connected with fuel tank.The small chamber of spool commutation process operating cylinder that the utility model can test regeneration valve with real simulation be fed to the regenerant flow of the big chamber of operating cylinder, and test data is more comprehensively and accurately.
Description
Technical Field
The utility model belongs to hydraulic pressure test technique, concretely relates to engineering machine tool working cylinder's flow regeneration testing arrangement.
Background
The work device of the excavator includes a boom driven by a boom cylinder, an arm driven by an arm cylinder, and a bucket driven by a bucket cylinder. Taking the arm as an example, during the retraction operation of the arm, the working medium discharged from the arm cylinder small chamber flows into the arm cylinder large chamber, and here, a part of the working medium flowing out from the arm cylinder small chamber is supplied to the arm cylinder large chamber during flow regeneration.
The mode for the flow regeneration test of the working oil cylinder according to the prior art adopts a variable displacement pump 1, an arm regeneration valve 2, a pilot pump 3 and an oil tank, and the specific connections are shown in figure 1. The testing method includes the steps that a working medium supplied by a pilot pump 3 is reversed by a bucket rod regeneration valve 2, the working medium supplied by a variable displacement pump 1 flows into a small cavity oil port of a bucket rod oil cylinder through the bucket rod regeneration valve, the large cavity oil port of the bucket rod oil cylinder is connected with an oil tank through the bucket rod regeneration valve, and the relation between the pressure of the small cavity oil ports of the bucket rod regeneration valve and the bucket rod oil cylinder and the output flow of the variable displacement pump 1 is calculated by measuring the output flow of the variable displacement pump 1 and the pressure value between the small cavity oil ports of the bucket rod regeneration valve and the bucket rod oil cylinder.
The bucket rod flow regeneration testing method can only test under the working condition that the bucket rod regeneration valve is reversed in place, and the regeneration flow in the valve core reversing process cannot be considered. The large cavity pressure of the bucket rod oil cylinder has great influence on flow regeneration in the flow regeneration process, and the prior art does not specifically analyze the flow regeneration. In addition, the flow regeneration process of the bucket rod, the flow of the main pump, the throttling of the bucket rod regeneration valve and the like influence the flow regeneration, so that the flow regeneration test of the working oil cylinder is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be: aiming at the defects existing in the flow regeneration test of the existing engineering machinery working oil cylinder, the novel flow regeneration test device of the engineering machinery working oil cylinder is provided.
The utility model discloses a following technical scheme realizes:
a flow regeneration testing device of an engineering machinery working oil cylinder comprises a flow regeneration system and a loading system;
the flow regeneration system comprises a first hydraulic pump, a regeneration valve and a working oil cylinder, wherein the first hydraulic pump is communicated with a large cavity of the working oil cylinder through the regeneration valve, the large cavity and a small cavity of the working oil cylinder are communicated in a one-way mode through the regeneration valve to realize flow regeneration, and meanwhile, the small cavity of the working oil cylinder flows back to an oil tank through the regeneration valve; a piston rod telescopic position sensor is installed on the working oil cylinder, a valve core displacement sensor is installed on the regeneration valve, and a flow sensor is installed between an oil return port of the regeneration valve and an oil tank;
the loading system comprises a loading oil cylinder, a second hydraulic pump and an overflow valve, wherein the telescopic end of the loading oil cylinder is connected with the working end of the working oil cylinder, the second hydraulic pump is communicated with one oil cavity of the loading oil cylinder, the loading direction of the loading oil cylinder is opposite to the working direction of the working oil cylinder, and the overflow valve is connected in parallel between the second hydraulic pump and the loading oil cylinder and is communicated with the oil tank.
Furthermore, the regeneration valve adopts hydraulic control reversing, and the hydraulic control end of the regeneration valve is communicated with the pilot pump.
Furthermore, the sectional area of a large cavity of the working oil cylinder is equal to that of a large cavity of the loading oil cylinder, and the sectional area of a small cavity of the working oil cylinder is equal to that of a small cavity of the loading oil cylinder.
The utility model discloses an among engineering machine tool working cylinder's flow regeneration testing arrangement, first hydraulic pump and second hydraulic pump adopt variable displacement pump respectively.
The utility model also discloses a test method of adopting the flow regeneration testing arrangement of above-mentioned engineering machine tool working cylinder specifically includes following step:
step S10: starting a second hydraulic pump, setting the overflow pressure of an overflow valve, pushing a loading oil cylinder to stretch by a working medium of a loading system, and loading the working oil cylinder;
step S20: starting a pilot pump to push a valve core of the regeneration valve to change to a flow regeneration position;
step S30: starting a first hydraulic pump, pumping a part of working medium of a flow regeneration system into a large cavity of a working oil cylinder through the first hydraulic pump, pushing a piston rod of the working oil cylinder to extend out, and returning the other part of working medium to an oil tank; meanwhile, a part of working medium in the small cavity of the working oil cylinder circularly flows into the large cavity of the working oil cylinder through the regeneration valve, and the other part of working medium in the small cavity flows back to the oil tank through the regeneration valve;
calculating the regeneration flow of the working oil cylinder by adopting the following two formulas:
Q1＝A×L1/t， (1)
Q＝Q1-Q2， (2)
wherein,
l1 is used for recording the telescopic displacement of the working oil cylinder by a piston rod telescopic position sensor,
a is the sectional area of a small cavity of the working oil cylinder,
t is the working time of the device,
q2 is a flow sensor that measures the flow of the service cylinder back to the tank through the regeneration valve.
Further, the utility model discloses still can calculate the case and target in place the regeneration flow of in-process different positions at the switching-over through case displacement sensor record regeneration valve case's different positions displacement L2.
The utility model discloses according to as above technical scheme can test the regeneration valve's case switching-over process working cylinder loculus supplies to the regeneration flow in working cylinder loculus. And moreover, the loading system can be used for actively simulating the load working state of the working oil cylinder. The flow control of the hydraulic pump and the throttling regulation of the regeneration valve can more comprehensively test the regeneration flow supplied to the large cavity by the small cavity of the working oil cylinder, and the test data is more comprehensive and accurate.
The utility model discloses not only can be applied to the dipper hydro-cylinder flow regeneration test of excavator, still can be used to other engineering machine tool working cylinder that need set up flow regeneration.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
FIG. 1 is a schematic diagram of a prior art boom cylinder regeneration valve connection.
FIG. 2 is a schematic connection diagram of a flow regeneration testing device for an arm cylinder in the embodiment.
FIG. 3 is a schematic structural diagram of a boom regeneration valve in an embodiment.
Reference numbers in the figures: the method comprises the following steps of 1-a variable displacement pump, 2-a bucket rod regeneration valve, 3-a pilot pump, 4-a bucket rod oil cylinder, 5-a loading oil cylinder, 6-a loading variable displacement pump, 7-an overflow valve, 8-a flow sensor, 9-a valve core displacement sensor and 10-a bucket rod telescopic position sensor.
Detailed Description
Examples
Referring to fig. 2, the flow regeneration testing device designed for the arm cylinder of the excavator is shown in the preferred embodiment of the present invention, which specifically includes a variable displacement pump 1, an arm regeneration valve 2, a pilot pump 3, an arm cylinder 4, a loading cylinder 5, a loading variable displacement pump 6, an overflow valve 7, a flow sensor 8, a spool displacement sensor 9, and an arm telescopic position sensor 10.
In the present embodiment, the arm cylinder 4 of the excavator is specifically described as a working cylinder, and in the arm retracting operation of the excavator, the working medium discharged from the small chamber of the arm cylinder flows into the large chamber of the arm cylinder, and in order to increase the speed of the arm retracting, the arm regeneration valve 2 is designed, and in this process, the working speed of the arm retracting is increased by the flow regeneration in the process that a part of the working medium flowing out from the small chamber of the arm cylinder is supplied to the large chamber of the arm cylinder.
As shown in fig. 2, the flow rate regeneration system for the arm cylinder 4 of the present embodiment includes several metering components, namely, a variable displacement pump 1, an arm regeneration valve 2, a pilot pump 3, a flow rate sensor 8, a spool displacement sensor 9, and an arm expansion and contraction position sensor 10. The first hydraulic pump of the flow regeneration system adopts a variable displacement pump 1, different output flows of the first hydraulic pump can be adjusted, the variable displacement pump 1 is communicated with an oil inlet of a bucket rod regeneration valve 2, and an oil return port of the bucket rod regeneration valve 2 is communicated to an oil tank in a backflow mode. The internal structure of the arm regeneration valve 2 can refer to a flow regeneration valve on an existing excavator, and the description of the internal structure is omitted here. The working oil port of the arm regeneration valve 2 is communicated with the large cavity and the small cavity of the arm cylinder 4 respectively (the large cavity and the small cavity referred to in this embodiment are the rodless cavity and the rod cavity of the cylinder corresponding to the large cavity and the small cavity respectively), and meanwhile, under the flow regeneration working condition of the arm regeneration valve 2, the large cavity and the small cavity of the arm cylinder 4 are communicated in a one-way mode from the small cavity to the large cavity through the arm regeneration valve.
An arm telescopic position sensor 10 for detecting telescopic displacement of the arm cylinder is installed on the arm cylinder 4 in the embodiment, a spool displacement sensor 9 for detecting spool displacement of the regeneration valve is installed on the arm regeneration valve 2, and a flow sensor 8 is further arranged between an oil return port of the arm regeneration valve 2 and an oil tank.
In order to better simulate the load working state of the arm cylinder, the telescopic end of the arm cylinder 4 is connected with a loading system, and the arm cylinder 4 is tested and loaded through the loading system consisting of the loading cylinder 5, the loading variable pump 6 and the overflow valve 7. The second hydraulic pump of the loading system adopts a loading variable pump 6, different loading effects on the bucket rod oil cylinder can be adjusted, an oil outlet of the loading variable pump 6 is directly communicated with a small cavity of the loading oil cylinder 5, an overflow valve 7 is arranged between the loading variable pump 6 and a small cavity interface of the loading oil cylinder 5 in parallel, the stability of loading pressure is guaranteed, the overflow valve 7 is communicated to an oil tank, and meanwhile, a working medium in the loading oil cylinder can also flow back to the oil tank through the overflow valve.
In order to enable the loading oil cylinder 5 to accurately test the loading of the arm oil cylinder 4, the sectional area of the large cavity of the arm oil cylinder 4 in the embodiment is equal to that of the large cavity of the loading oil cylinder 5, and the sectional area of the small cavity of the arm oil cylinder 4 is equal to that of the small cavity of the loading oil cylinder 5.
In the process of executing the retraction action of the arm, the variable displacement pump 1 pumps working medium (hydraulic oil) into the large cavity of the arm cylinder 4 from one part of the arm regeneration valve, the other part of the working medium flows into the oil tank through the throttle valve, the working medium entering the large cavity of the arm cylinder 4 extrudes the piston rod of the arm cylinder 4, the working medium in the small cavity of the arm cylinder 4 flows into the large cavity of the arm cylinder 4 through one part of the arm regeneration valve 6, the other part of the working medium in the small cavity flows back to the oil tank through the arm regeneration valve, the output flow of the variable displacement pump 1 flows into the large cavity of the arm cylinder 4 through one part of the arm regeneration valve 6, and the flow of the travel arm cylinder in the process of driving the retraction action of the arm is regenerated.
As shown in fig. 3, the arm regeneration valve 2 of the present embodiment includes two extreme operating positions, namely a regeneration operating position at the left side and a stop operating position at the right side, and a transient regeneration operating position (shown by a dotted line in fig. 3) in which the regeneration flow rate changes in real time is formed when the regeneration valve spool moves between the two operating positions, in this process, the regeneration valve spool connects the flow passage in the valve body, and the opening degree of the flow passage connection changes in real time along with the movement of the spool, which corresponds to forming a variable throttle valve on the flow passage of the regeneration operating position, and the regeneration flow rate of the regeneration valve spool at different positions in the reversing-to-position process is calculated by the displacement L2 of the spool moving to different positions.
The flow regeneration test of the arm cylinder by the test device in the embodiment specifically comprises the following steps:
step S10: starting the loading variable pump 6, setting the overflow pressure of the overflow valve 7, pushing a piston rod of the loading oil cylinder 5 to retract through a working medium of a loading system, and loading the bucket rod oil cylinder 4;
step S20: starting the pilot pump 3, pushing a valve core of the bucket rod regeneration valve 2 to change to a flow regeneration position, and forming the maximum regeneration flow of the bucket rod oil cylinder after the valve core of the bucket rod regeneration valve is in place;
step S30: starting the variable displacement pump 1, pumping a part of working medium of the flow regeneration system into a large cavity of the arm cylinder 4 through the variable displacement pump 1, pushing a piston rod of the arm cylinder 4 to extend out, and returning the other part of the working medium to the oil tank; meanwhile, a part of working medium in the small cavity of the arm cylinder 4 circularly flows into the large cavity of the arm cylinder 4 through the arm regeneration valve 2, and the other part of working medium in the small cavity flows back to the oil tank through the regeneration valve;
in step S20, the spool displacement of the arm regeneration valve 2 is increased to the flow rate regeneration position as the pilot pressure increases, and the spool position of the arm regeneration valve 2 is recorded by the spool displacement sensor 9.
In step S30, arm displacement sensor 12 records the extension displacement of the arm cylinder, and flow sensor 8 measures the flow rate of arm cylinder 4 flowing into the tank through arm regeneration valve 2.
The following two formulas are adopted to calculate the regeneration flow of the working oil cylinder:
Q1＝A×L1/t， (1)
Q＝Q1-Q2， (2)
wherein,
l1 is used for recording the telescopic displacement of the working oil cylinder by a piston rod telescopic position sensor,
a is the sectional area of a small cavity of the working oil cylinder,
t is the working time of the device,
q2 is a flow sensor that measures the flow of the service cylinder back to the tank through the regeneration valve.
In the reversing process of the valve core of the bucket rod regeneration valve, the flow area among the flow channels changes along with the change, and the regeneration amount also changes along with the change. The valve core displacement sensor 9 records the displacement L2 of the valve core of the regeneration valve at different positions, and the regeneration flow of the valve core at different positions in the reversing process is calculated.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (4)
1. The utility model provides a flow regeneration testing arrangement of engineering machine tool working cylinder which characterized in that: the system comprises a flow regeneration system and a loading system;
the flow regeneration system comprises a first hydraulic pump, a regeneration valve and a working oil cylinder, wherein the first hydraulic pump is communicated with a large cavity of the working oil cylinder through the regeneration valve, the large cavity and a small cavity of the working oil cylinder are communicated in a one-way mode through the regeneration valve to realize flow regeneration, and meanwhile, the small cavity of the working oil cylinder flows back to an oil tank through the regeneration valve; a piston rod telescopic position sensor is installed on the working oil cylinder, a valve core displacement sensor is installed on the regeneration valve, and a flow sensor is installed between an oil return port of the regeneration valve and an oil tank;
the loading system comprises a loading oil cylinder, a second hydraulic pump and an overflow valve, wherein the telescopic end of the loading oil cylinder is connected with the working end of the working oil cylinder, the second hydraulic pump is communicated with one oil cavity of the loading oil cylinder, the loading direction of the loading oil cylinder is opposite to the working direction of the working oil cylinder, and the overflow valve is connected in parallel between the second hydraulic pump and the loading oil cylinder and is communicated with the oil tank.
2. The flow regeneration testing device of the working oil cylinder of the engineering machinery according to claim 1, wherein the regeneration valve adopts hydraulic control reversing, and a hydraulic control end of the regeneration valve is communicated with the pilot pump.
3. The flow regeneration testing device of the working cylinder of the engineering machinery according to claim 1, wherein the sectional area of the large cavity of the working cylinder is equal to that of the large cavity of the loading cylinder, and the sectional area of the small cavity of the working cylinder is equal to that of the small cavity of the loading cylinder.
4. The device for testing the regeneration of the flow rate of the working cylinder of the construction machine according to any one of claims 1 to 3, wherein the first hydraulic pump and the second hydraulic pump are respectively variable displacement pumps.
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| CN201721353482.4U CN207349204U (en) | 2017-10-19 | 2017-10-19 | A kind of flow regeneration test device of engineering machinery operating cylinder |
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| CN201721353482.4U CN207349204U (en) | 2017-10-19 | 2017-10-19 | A kind of flow regeneration test device of engineering machinery operating cylinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642518A (en) * | 2017-10-19 | 2018-01-30 | 无锡必克液压股份有限公司 | The flow regeneration test device and method of testing of a kind of engineering machinery operating cylinder |
| CN111550467A (en) * | 2020-05-27 | 2020-08-18 | 上海华兴数字科技有限公司 | Hydraulic control loop and hydraulic control method |
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2017
- 2017-10-19 CN CN201721353482.4U patent/CN207349204U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642518A (en) * | 2017-10-19 | 2018-01-30 | 无锡必克液压股份有限公司 | The flow regeneration test device and method of testing of a kind of engineering machinery operating cylinder |
| CN107642518B (en) * | 2017-10-19 | 2024-02-02 | 无锡必克液压股份有限公司 | Flow regeneration testing device and testing method for working cylinder of engineering machinery |
| CN111550467A (en) * | 2020-05-27 | 2020-08-18 | 上海华兴数字科技有限公司 | Hydraulic control loop and hydraulic control method |
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