CN212951190U - Quantitative oil injection/oil discharge device for static test of undercarriage - Google Patents
Quantitative oil injection/oil discharge device for static test of undercarriage Download PDFInfo
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- CN212951190U CN212951190U CN202021777637.9U CN202021777637U CN212951190U CN 212951190 U CN212951190 U CN 212951190U CN 202021777637 U CN202021777637 U CN 202021777637U CN 212951190 U CN212951190 U CN 212951190U
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Abstract
The utility model discloses a quantitative oil injection/oil discharge device for static test of undercarriage, which comprises an oil injection cylinder and a loading mechanism, wherein a piston is arranged in the oil injection cylinder in a sealing and sliding manner, the oil injection cylinder is divided into a first sealing cavity and a second sealing cavity by the piston, and the second sealing cavity is used for being communicated with an oil cylinder to be tested of the undercarriage; the two ends of the piston along the axial direction of the oil injection cylinder are respectively provided with a first piston rod and a second piston rod, the first piston rod is fixedly connected with a loading mechanism after extending out of the first sealed cavity, and the loading mechanism is used for pushing the piston to move towards the second sealed cavity in a one-way mode; the second piston rod extends out of the second sealing cavity, and a displacement sensor used for measuring the piston stroke is arranged at the extending end of the second piston rod. The oil cavity in the quantitative oil injection cylinder is driven to change by pressurization of the loading mechanism, the displacement change value of the piston is accurately measured by the displacement sensor, the volume change of oil in the inner cavity of the undercarriage is inversely calculated, and the principle of oil discharge of the undercarriage is similar to the oil injection principle, so that the accuracy of the posture of the undercarriage during static test can be ensured.
Description
Technical Field
The utility model relates to an experimental technical field of undercarriage especially relates to an undercarriage static test quantitative oiling/oil extraction device.
Background
Static tests are required to be carried out on the aircraft landing gear in the development process. In order to assess the load bearing capacity of the undercarriage structure, hydraulic oil with specified capacity is filled into the undercarriage to stabilize the undercarriage to a required posture, and a static force bearing test is carried out step by step according to a specific load enveloping working condition; after the static test of one attitude is finished, the attitude of the undercarriage is converted by injecting or discharging oil in the inner cavity of the undercarriage, and then the static test of the next attitude is carried out.
During the oil injection under each working condition in the static test process, an inflation valve on a strut of the undercarriage is unscrewed to connect an upper pipeline, corresponding oil is gradually and slowly injected into the undercarriage through a hand pump, and the volume of the injected oil is calculated by observing the leakage change value of a piston rod;
similarly, when the undercarriage buffering support post discharges oil, the threads at the position of the inflation valve are loosened manually, the undercarriage supporting post is slowly drained, and the volume of the oil is calculated by observing the change of the leakage amount of the undercarriage buffering support post.
Along with the continuous progress of undercarriage fine design, more strict requirements are provided for the posture of the undercarriage when the static test is carried out, corresponding technical index requirements cannot be met according to the oil injection and oil discharge modes, therefore, a set of oil injection and oil discharge device aiming at the undercarriage static test accuracy needs to be designed, the requirements of a new machine type are met, and accurate and effective test reference data are provided for design.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide an undercarriage static test quantitative oiling/oil extraction device that improves the static test precision.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a quantitative oil injection/oil discharge device for a static test of an undercarriage comprises an oil injection cylinder and a loading mechanism, wherein a first piston is arranged in the oil injection cylinder in a sealing and sliding manner, the oil injection cylinder is divided into a first sealing cavity and a second sealing cavity by the first piston, and the second sealing cavity is used for being communicated with an oil cylinder to be tested of the undercarriage; a first piston rod and a second piston rod are respectively arranged at two ends of the first piston along the axial direction of the oil injection cylinder, the first piston rod is fixedly connected with a loading mechanism after extending out of the first sealed cavity, and the loading mechanism is used for pushing the first piston to move towards the second sealed cavity in a one-way mode; the second piston rod extends out of the second sealing cavity, and a first displacement sensor for measuring the stroke of the first piston is mounted at the extending end of the second piston rod.
Through the pressurization of the loading mechanism, an oil cavity in the quantitative oil injection cylinder is driven to change, the displacement movement change value of the first piston is accurately measured through the first displacement sensor, the volume change of oil in the inner cavity of the undercarriage is inversely calculated, the principle of the undercarriage during oil discharge is similar to the oil injection principle, and therefore the accuracy of the posture of the undercarriage during static test can be guaranteed.
As a further improvement of the above technical solution:
the oil filling device is characterized in that oil is filled in the first sealed cavity, the first sealed cavity is communicated with a first reversing valve, the first reversing valve is communicated with a first oil tank through two oil ways, and one of the oil ways is provided with an oil filling pump which is used for pressing the oil into the first sealed cavity so that the first sealed cavity is always in an oil full state.
When the first piston moves towards the second sealing cavity, the reversing valve is communicated with an oil way with an oil supplementing pump, and the oil supplementing pump is pressed into the first cavity after absorbing oil from the first oil tank so that the first cavity is always in an oil full state, so that the testing error caused by the existence of air in the first cavity is avoided. When the first piston moves towards the first sealing cavity, the reversing valve is communicated with the other oil way, and redundant oil in the first cavity returns to the first oil tank through the other oil way.
And a first quick-change connector is arranged on a pipeline for communicating the second sealing cavity with the oil cylinder to be tested of the undercarriage. The quick-change connector is a connector which can realize connection or disconnection of pipelines without tools. The first quick-change connector can ensure that no air enters oil liquid in the oil injection end of the injector all the time.
The loading mechanism comprises a loading cylinder, and a second reversing valve, a loading pump and a second oil tank which are sequentially communicated; the loading cylinder is internally provided with a second piston in a sealing and sliding manner, one end of the second piston, facing the oil injection cylinder, is provided with a third piston rod which is coaxially arranged with the first piston rod, the second piston divides an inner cavity of the loading cylinder into a rod cavity and a rodless cavity, the third piston rod is fixedly connected with the first piston rod after extending out of the rod cavity, and the rodless cavity are both communicated with a second reversing valve.
When quantitative oil injection is carried out, the second reversing valve is communicated with the rodless cavity, the loading pump sucks oil from the second oil tank and pumps the oil into the rodless cavity so as to push the second piston to move towards the oil injection cylinder and further push the oil injection cylinder to inject oil into the oil cylinder to be tested of the undercarriage. When the oil is quantitatively discharged, the second reversing valve is communicated with the rod cavity, the oil in the oil cylinder to be tested of the undercarriage pushes the first piston to move towards the loading cylinder, the second piston is further pushed to move towards the rodless cavity, the loading pump only serves as oil supplement at the moment, and the oil enters the rod cavity of the loading cylinder.
And a second displacement sensor for measuring the stroke of the second piston is arranged on the extending end of the third piston rod. The second displacement sensor may function to assist in monitoring the travel of the first displacement sensor.
And second quick-change connectors are arranged on pipelines for communicating the rodless cavity with the second reversing valve and pipelines for communicating the rodless cavity with the second reversing valve. The second quick-change connector can ensure that no air enters the loading cylinder all the time.
And the third piston rod is fixedly connected with the first piston rod through a coupling.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses an undercarriage static test quantitative oiling/oil extraction device, through totally enclosed quantitative injector's high accuracy displacement control, the volume that calculates corresponding injection or discharge undercarriage inner chamber fluid that can be convenient. The device is applied and implemented, the inaccuracy of oil injection/oil discharge amount caused by the attitude adjustment of the landing gear in the static test process of the landing gear can be solved, and the condition that the test verification is insufficient or excessive is avoided. The device effectively shortens the development period, more truly reflects the actual test result of the product, is convenient to implement and has wide adaptability.
Drawings
Fig. 1 is the utility model discloses landing gear static test quantitative oiling/oil extraction device's of embodiment structural schematic.
Fig. 2 is a schematic diagram of the principle of the quantitative oil filling/discharging device for the landing gear static test.
FIG. 3 is a schematic diagram of changes in the volume of a cylinder during quantitative oiling in a static test of the landing gear.
Fig. 4 is a schematic diagram of the quantitative oil drainage of the quantitative oil filling/drainage device for the landing gear static test.
FIG. 5 is a schematic diagram of change of the volume of the oil cylinder during quantitative oil drainage in a static test of the landing gear.
Illustration of the drawings: 1. a second oil tank; 2. a loading pump; 3. a second directional control valve; 4. a second quick-change connector; 5. a loading cylinder; 51. a rod cavity; 52. a rodless cavity; 6. a second displacement sensor; 7. a coupling; 8. a first oil tank; 9. an oil replenishing pump; 10. a first direction changing valve; 11. injecting an oil cylinder; 111. a first sealed chamber; 112. a second sealed chamber; 12. a first displacement sensor; 13. a first quick-change connector; 14. a first piston; 15. a first piston rod; 16. a second piston rod; 17. a second piston; 18. a third piston rod.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
Example (b):
as shown in fig. 1, the quantitative oil filling/draining device for the static test of the landing gear of the embodiment includes an oil filling cylinder 11 and a loading mechanism, wherein a first piston 14 is hermetically and slidably arranged in the oil filling cylinder 11, the first piston 14 divides the oil filling cylinder 11 into a first sealed cavity 111 and a second sealed cavity 112, and the second sealed cavity 112 is used for communicating with an oil cylinder to be tested of the landing gear; a first quick-change connector 13 is arranged on a pipeline of the second sealing cavity 112 communicated with the cylinder to be tested of the undercarriage.
A first piston rod 15 and a second piston rod 16 are respectively arranged at two ends of the first piston 14 along the axial direction of the injection cylinder 11, the first piston rod 15 is fixedly connected with a loading mechanism after extending out of the first sealed cavity 111, and the loading mechanism is used for pushing the first piston 14 to move towards the second sealed cavity 112 in a one-way manner; the second piston rod 16 extends from the second seal chamber 112, and a first displacement sensor 12 for measuring the stroke of the first piston 14 is mounted on the extending end of the second piston rod 16.
Wherein, it has fluid to fill in first sealed chamber 111, and first sealed chamber 111 communicates with a first switching-over valve 10, and first switching-over valve 10 communicates with a first oil tank 8 respectively through two oil circuits, is equipped with on one of them oil circuit to be used for to the first sealed chamber 111 middling pressure income fluid so that first sealed chamber 111 is in the oil supplementing pump 9 of full oily state all the time.
In the embodiment, the loading mechanism comprises a loading cylinder 5, and a second reversing valve 3, a loading pump 2 and a second oil tank 1 which are sequentially communicated; a second piston 17 is arranged in the loading cylinder 5 in a sealing and sliding manner, a third piston rod 18 which is coaxially arranged with the first piston rod 15 is arranged at one end, facing the injection cylinder 11, of the second piston 17, the inner cavity of the loading cylinder 5 is divided into a rod cavity 51 and a rodless cavity 52 by the second piston 17, the third piston rod 18 is fixedly connected with the first piston rod 15 through a coupler 7 after extending out of the rod cavity 51, and a second displacement sensor 6 for measuring the stroke of the second piston 17 is arranged at the extending end of the third piston rod 18.
Wherein, the rodless chamber 52 and the rodless chamber 52 are both communicated with the second direction valve 3. And a pipeline for communicating the rodless cavity 52 with the second reversing valve 3 are respectively provided with a second quick-change connector 4.
The quantitative oil injection/oil discharge device for the static test of the landing gear mainly comprises a servo loading system and a quantitative injector. The servo loading system is a loading system adopted during landing gear static test and is mainly composed of a second oil tank 1, a loading pump 2, a servo valve (a second reversing valve 3), a second quick-change connector 4, a servo cylinder (a loading cylinder 5), a second displacement sensor 6 and the like, and the system is mainly a mechanism for driving a quantitative injector. The quantitative injector part mainly comprises a first oil tank 8, an oil supplementing pump 9, an oil supplementing pump reversing valve (a first reversing valve 10), an injector (an oil injection cylinder 11), a first displacement sensor 12, a first quick-change connector 13 and the like, and the quantitative injector part mainly realizes the specific realization of the landing gear during oil injection and oil discharge, and the oil injection and the oil discharge of the landing gear are respectively explained in principle in the following.
The quantitative oil injection process comprises the following steps:
the undercarriage static test quantitative oiling principle is shown in fig. 2, when the undercarriage needs to be injected with oil to change the posture, the end of a second reversing valve 3DTa is electrified, the oil enters a rodless cavity of a loading cylinder 5, the loading cylinder 5 is controlled to slowly extend out in a displacement control mode, and the loading cylinder 5 is fixedly connected with an oiling cylinder 11 through a coupler 7, so that the displacement of a displacement sensor 6 is controlled to be consistent with the stroke of a displacement sensor 12; because the oil in the oil injection cylinder 11 is required to be in a full oil state all the time, the pressure of the oil supplementing pump 9 is adjusted to be within 1MPa, the first reversing valve 10DTc end is electrified while the DTa is electrified, the oil supplementing pump 9 supplements the oil to the oil injection cylinder 11 through the first reversing valve 10 in the movement process of the oil injection cylinder 11, the oil in the low-pressure cavity of the oil injection cylinder 11 enters the cavity of the landing gear through the first quick-change connector 13, and the first quick-change connector 13 can ensure that no air enters the oil in the oil injection end of the oil injection cylinder 11 all the time; the oil volume is calculated through the relationship in fig. 3, and the purpose of quantitative oil injection is achieved. The oil formula calculation can calculate specific oil filling volume through the formula (1).
D, the diameter of the inner cavity of the oil injection cylinder is in unit mm;
l is the displacement of the oil injection cylinder (equivalent to the displacement measured by the displacement sensor during oil injection) in unit mm;
v is the volume of oil injected in ml.
The quantitative oil discharge process is as follows:
the landing gear static test quantitative oil discharge principle is shown in fig. 4, when the landing gear needs to discharge oil to change the posture, the loading cylinder 5 is switched to a force control mode, the pressure of the loading pump 2 is adjusted to be within 1MPa, then the DTb end of the second reversing valve 3 is electrified, the oil enters a rod cavity of the loading cylinder 5, the loading pump 2 only serves for oil supplement at the moment, and the oil injection cylinder 11 actively pushes the loading cylinder 5 to move leftwards slowly by applying a pressure load to the landing gear slowly; similarly, the loading cylinder 5 is fixedly connected with the oil injection cylinder 11 through the coupler 7, the displacement of the second displacement sensor 6 is controlled to be consistent with the stroke of the first displacement sensor 12 for measurement, the DTb is electrified, the DTd end of the first reversing valve 10 is electrified, oil in the low-pressure cavity flows back to the oil tank through the first reversing valve 10 in the movement process of the oil injection cylinder 11, the volume of the oil is calculated through the relation in the graph 5, and the quantitative oil injection purpose is achieved. The oil formula calculation can calculate specific oil filling volume through the formula (1).
D, the diameter of the inner cavity of the oil injection cylinder is in unit mm;
l is the displacement of the oil injection cylinder (equivalent to the displacement measured by the displacement sensor during oil injection) in unit mm;
v is the volume of oil injected in ml.
The device changes the traditional undercarriage static force oil injection method, the quantitative injector is pushed by controlling the action of the servo loading cylinder through displacement and force, the injected and discharged oil volume is accurately calculated through the stroke fed back by the displacement sensor, the attitude correctness of the undercarriage is ensured, and the accuracy of the undercarriage static force test data is improved.
The device is mainly applied to the static test of the landing gear in the aviation field to adjust the attitude, and can also be applied to the technical fields of quantitative oil injection, oil discharge and the like.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (7)
1. A quantitative oil injection/oil discharge device for a static test of an undercarriage is characterized by comprising an oil injection cylinder (11) and a loading mechanism, wherein a first piston (14) is arranged in the oil injection cylinder (11) in a sealing and sliding manner, the first piston (14) divides the oil injection cylinder (11) into a first sealing cavity (111) and a second sealing cavity (112), and the second sealing cavity (112) is used for being communicated with an oil cylinder to be tested of the undercarriage; a first piston rod (15) and a second piston rod (16) are respectively arranged at two ends of the first piston (14) along the axial direction of the oil injection cylinder (11), the first piston rod (15) is fixedly connected with a loading mechanism after extending out of the first sealed cavity (111), and the loading mechanism is used for pushing the first piston (14) to move towards the second sealed cavity (112) in a one-way manner; the second piston rod (16) extends out of the second sealed cavity (112), and a first displacement sensor (12) for measuring the stroke of the first piston (14) is installed on the extending end of the second piston rod (16).
2. The gear static test quantitative oil filling/discharging device according to claim 1, characterized in that the first seal cavity (111) is filled with oil, the first seal cavity (111) is communicated with a first reversing valve (10), the first reversing valve (10) is respectively communicated with a first oil tank (8) through two oil paths, and one of the two oil paths is provided with an oil filling pump (9) for pressing oil into the first seal cavity (111) so as to keep the first seal cavity (111) in a full oil state all the time.
3. The quantitative oiling/draining device for static tests of landing gears according to claim 1, characterized in that the pipeline of the second sealed cavity (112) communicating with the cylinder to be tested of the landing gear is provided with a first quick-change connector (13).
4. The static test quantitative oiling/draining device for landing gear according to any one of the claims 1 to 3, characterized in that the loading mechanism comprises a loading cylinder (5), and a second reversing valve (3), a loading pump (2) and a second oil tank (1) which are communicated in sequence; a second piston (17) is arranged in the loading cylinder (5) in a sealing and sliding mode, a third piston rod (18) which is coaxially arranged with the first piston rod (15) is arranged at one end, facing the oil injection cylinder (11), of the second piston (17), the inner cavity of the loading cylinder (5) is divided into a rod cavity (51) and a rodless cavity (52) by the second piston (17), the third piston rod (18) is fixedly connected with the first piston rod (15) after extending out of the rod cavity (51), and the rodless cavity (52) are communicated with the second reversing valve (3).
5. A landing gear static test dosing/drainage device according to claim 4, characterised in that the projecting end of the third piston rod (18) has mounted thereon a second displacement sensor (6) for measuring the stroke of the second piston (17).
6. The gear static test quantitative oil filling/draining device according to claim 4, characterized in that a second quick-change connector (4) is arranged on a pipeline of the rodless cavity (52) communicated with the second reversing valve (3) and a pipeline of the rodless cavity (52) communicated with the second reversing valve (3).
7. The gear static test dosing/draining device according to claim 4, characterized in that the third piston rod (18) and the first piston rod (15) are fixedly connected by a coupling (7).
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| CN202021777637.9U CN212951190U (en) | 2020-08-24 | 2020-08-24 | Quantitative oil injection/oil discharge device for static test of undercarriage |
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| CN202021777637.9U CN212951190U (en) | 2020-08-24 | 2020-08-24 | Quantitative oil injection/oil discharge device for static test of undercarriage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114368723A (en) * | 2021-11-10 | 2022-04-19 | 浙江中控技术股份有限公司 | Quantitative oil filling method for base diaphragm capsule |
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2020
- 2020-08-24 CN CN202021777637.9U patent/CN212951190U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114368723A (en) * | 2021-11-10 | 2022-04-19 | 浙江中控技术股份有限公司 | Quantitative oil filling method for base diaphragm capsule |
| CN114368723B (en) * | 2021-11-10 | 2023-12-22 | 浙江中控技术股份有限公司 | Quantitative oil filling method for base diaphragm capsule |
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