CN115266047A - Oil sprayer spring shell testing device and testing method - Google Patents
Oil sprayer spring shell testing device and testing method Download PDFInfo
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- CN115266047A CN115266047A CN202210519776.9A CN202210519776A CN115266047A CN 115266047 A CN115266047 A CN 115266047A CN 202210519776 A CN202210519776 A CN 202210519776A CN 115266047 A CN115266047 A CN 115266047A
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Abstract
The invention discloses a device and a method for testing a spring shell of an oil sprayer, relates to the technical field of diesel engine testing, solves the problem that the energetic judgment of the spring shell cannot be realized, improves the detection efficiency and precision, and ensures the quality of a diesel engine, and has the following specific scheme: including control system and the hydraulic system who is connected with control system, testboard and human-computer interaction interface, the testboard is equipped with the support, the fixed pneumatic cylinder that is equipped with in bottom of support, the pneumatic cylinder is connected with hydraulic system, fixes being equipped with sliding platform on the hydraulic cylinder top hydraulic stem, and sliding platform's top is fixed to be equipped with a plurality of supporting seats, and the top correspondence of every supporting seat is equipped with a pressure measurement mechanism, pressure measurement mechanism is fixed to be set up at the top of support, and the lateral part of support is fixed to be equipped with the position sensor who is connected with sliding platform.
Description
Technical Field
The invention relates to the technical field of diesel engine testing, in particular to a device and a method for testing a spring shell of an oil injector.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The spring shell is used for occasions with strict requirements on pre-tightening force, such as a process of fixing the fuel injector and tensioning the chain, and has the characteristics of high rigidity, strong buffering and vibration absorbing capacity and capability of bearing larger load with small deformation. The spring housing for holding the fuel injector ensures that the compressive stress between the fuel injector and the cylinder head mounting bore is relatively constant regardless of operator variations, changes in the operating time of the diesel engine, and changes in operating conditions (e.g., operating temperature).
The common fault of the spring shell is that the elasticity is reduced, when the spring shell is in fault, the conditions that a certain cylinder does not spray oil, the work of the diesel engine suddenly drops and the oil sprayer is damaged due to high stress can occur, so that the working performance of the diesel engine is abnormal, a deceleration or parking alarm is generated, and the normal navigation of a ship is endangered in serious cases.
The inventor discovers that a diesel engine cylinder contains a plurality of spring housing, when the diesel engine is made or later maintenance, can't guarantee the uniformity of same jar interior spring housing performance, and when certain diesel engine cylinder broke down, can't be fast accurate find out the spring housing that the performance changed, solve through the mode that artificially blindly increases spring housing pretightning force mostly, probably lead to the stress surface to surrender, can lead to the gas channeling in the jar when serious.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device and a method for testing a spring shell of an oil sprayer.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a fuel injector spring shell testing device which comprises a control system, a hydraulic system, a testing platform and a human-computer interaction interface, wherein the hydraulic system, the testing platform and the human-computer interaction interface are connected with the control system, the testing platform is provided with a support, a hydraulic cylinder is fixedly arranged at the bottom of the support and connected with the hydraulic system, a sliding platform is fixedly arranged on a hydraulic rod at the top of the hydraulic cylinder, a plurality of supporting seats are fixedly arranged at the top of the sliding platform, a pressure detection mechanism is correspondingly arranged at the top of each supporting seat and fixedly arranged at the top of the support, and a position sensor connected with the sliding platform is fixedly arranged on the side portion of the support.
As a further implementation mode, the hydraulic rod is located at the center of the sliding platform, and the supporting seats are oppositely arranged on two sides of the hydraulic rod.
As a further implementation mode, the supporting seat is in threaded connection with the sliding platform, and a boss which is connected with the spring shell in a positioning mode is arranged at the top of the supporting seat.
As a further implementation mode, the pressure detection mechanism is composed of a pressure head and a first pressure sensor, the first pressure sensor is fixedly arranged at the top of the support, the bottom of the first pressure sensor is fixedly connected with the pressure head, and the first pressure sensor and the position sensor are both connected with the control system.
As a further implementation manner, the first pressure sensor is coaxially arranged with the pressure head and the supporting seat.
As a further implementation mode, the hydraulic system is provided with a hydraulic oil tank, an oil inlet pipeline and an oil outlet pipeline of the hydraulic oil tank are connected with the hydraulic cylinder through a reversing valve, and the reversing valve is connected with the control system.
As a further implementation manner, a second filter, a hydraulic oil pump, a check valve, a second pressure sensor, a first filter and an energy accumulator are sequentially arranged on the oil inlet pipeline from one end close to the hydraulic oil tank to one end close to the hydraulic cylinder.
As a further implementation mode, the oil inlet pipeline is further connected with an overflow pipeline, the overflow pipeline is communicated with a hydraulic oil tank, an overflow valve is arranged on the overflow pipeline, and a liquid level meter is arranged in the hydraulic oil tank.
As a further implementation mode, a static test module and a reliability test module are arranged in the control system, and the test modes can be switched.
In a second aspect, the invention provides a method for testing a spring shell of an oil injector, which utilizes the device for testing a spring shell of an oil injector, and specifically comprises the following steps:
selecting a corresponding pressure head and a corresponding supporting seat according to a spring shell to be tested and installing;
controlling the sliding platform to move upwards through a human-computer interaction interface until the lower surface of the pressure head is contacted with the upper surface of the supporting seat, and calibrating the position at the moment as an initial position;
controlling the sliding platform to move downwards, and correspondingly installing the spring shell to be tested on the supporting seat;
selecting a test mode on a human-computer interaction interface, and testing;
and after the test is finished, comparing the elastic force-displacement curve or the elastic force attenuation curve obtained by the test with a design value.
The beneficial effects of the invention are as follows:
(1) The invention utilizes the control system to control the action of the test board to carry out static characteristic test or reliability test on the spring shell so as to obtain an elasticity-displacement curve chart, can intuitively judge whether the static characteristic and the reliability of the spring shell of the diesel injector are normal or not, and improves the installation quality of diesel engine parts; the maintenance is convenient for turbine managers to do in advance, the shutdown risk of the diesel engine is reduced, and the high cost caused by blind replacement of new parts is reduced in the maintenance process.
(2) The invention can test at least two spring shells simultaneously, not only greatly improves the test efficiency, but also can carry out pairing test on a plurality of spring shells or carry out combination comparison on the test results of the spring shells to select a group with the closest performance, thereby ensuring the overall quality of the diesel engine.
(3) The oil inlet pipeline is provided with the energy accumulator, so that the fluctuation of hydraulic oil during reversing of the reversing valve can be inhibited, the pressure stabilizing effect is realized, the working pressure of the hydraulic cylinder is stable, the accuracy of a measuring result is ensured, and meanwhile, the oil inlet pipeline is also connected with the overflow pipeline, so that the oil way overpressure can be effectively prevented, and the damage of the device is avoided.
(4) The hydraulic rod is positioned at the center of the sliding platform, so that the sliding platforms on two sides of the hydraulic rod can be effectively uniformly stressed, the stress of the spring shells is the same, and the first pressure sensor, the pressure head, the spring shells and the corresponding supporting seats are coaxially arranged, so that the accuracy of a measuring result is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the overall construction of a fuel injector spring housing test apparatus according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a test station according to one or more embodiments of the present invention;
FIG. 3 is a schematic diagram of a hydraulic system according to one or more embodiments of the present disclosure;
in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1, a hydraulic system; 2. a test bench; 3. a human-computer interaction interface; 4. a control system; 5. a first pressure sensor; 6. a pressure head; 7. a spring housing; 8. a supporting seat; 9. a position sensor; 10. a sliding platform; 11. a hydraulic cylinder; 12. a support; 13. a limiting block; 14. a first filter; 15. an accumulator; 16. a diverter valve; 17. an overflow valve; 18. a liquid level meter; 19. a hydraulic oil tank; 20. a second filter; 21. a hydraulic oil pump; 22. a one-way valve; 23. a second pressure sensor.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As introduced in the background art, when diesel engine oil is manufactured and maintained later, the consistency of the performances of the spring shells in the same cylinder cannot be ensured, when a certain diesel engine cylinder fails, the spring shell with changed performances cannot be found out quickly and accurately, and the problems that the stress surface is yielded and gas blowby in the cylinder can be caused in serious cases are mostly solved by manually and blindly increasing the pretightening force of the spring shell.
Example 1
In a typical embodiment of the present invention, as shown in fig. 1 to fig. 3, a fuel injector spring housing testing apparatus is provided, which includes a hydraulic system 1, a testing platform 2, a human-computer interaction interface 3, and a control system 4, where the control system 4 is connected to the hydraulic system 1, the testing platform 2, and the human-computer interaction interface 3, respectively.
As shown in fig. 2, the testing table 2 is composed of a first pressure sensor 5, a pressure head 6, a supporting seat 8, a position sensor 9, a sliding platform 10, a hydraulic cylinder 11, a bracket 12 and a limiting block 13, wherein the bracket 12 is a main supporting component, and each functional component is arranged on the bracket 12.
Specifically, the bottom and the top of the support 12 are both sealed by plates, the hydraulic cylinder 11 is vertically and fixedly arranged on the plate at the bottom of the support 12, the telescopic rod positioned at the top of the hydraulic cylinder 11 is fixedly connected with the sliding platform 10, and both sides of the sliding platform 10 are slidably connected with the side wall of the support 12, so that the sliding platform 10 can be driven by the telescopic action of the hydraulic rod to vertically reciprocate in the support 12;
wherein, the hydraulic stem is located at the central position of the sliding platform 10 to ensure that the two sides of the sliding platform 10 are stressed uniformly.
Two sides of the bracket 12 are further provided with two limiting blocks 13, the two limiting blocks 13 on each side are arranged oppositely up and down, and the two limiting blocks 13 are used for limiting the moving distance of the sliding platform 10 so as to prevent the sliding platform 10 from exceeding the stroke and causing damage to components.
The top of the sliding platform 10 is fixedly provided with a plurality of supporting seats 8, the supporting seats 8 are oppositely disposed on two sides of the hydraulic rod, and the number of the supporting seats 8 on two sides of the hydraulic rod is the same, for easy understanding, the embodiment takes two supporting seats 8 as an example for description.
Two supporting seats 8 are fixed to be set up on sliding platform 10, and two supporting seats 8 set up the both sides at the hydraulic stem relatively to when pneumatic cylinder 11 is to sliding platform 10 application of force, can guarantee that two 8 atress of supporting seats equal, because contain two at least spring housing 7 in the sprayer, the multiunit supporting seat 8 that the design is the same can improve detection efficiency and also can carry out preferred matching to the performance of many spring housing 7, with the working property of guaranteeing each sprayer the same as far as possible.
Wherein, sliding platform 10 is used for the position department of erection bracing seat 8 to be equipped with the mounting hole, is equipped with the internal thread in the mounting hole, and the bottom of supporting seat 8 is equipped with the external screw thread, through threaded mode fixed connection between supporting seat 8 and sliding platform 10 to when the specification of the spring housing 7 that awaits measuring is different, the accessible is changed supporting seat 8 and is adapted to the test demand, and the top of supporting seat 8 has the boss, and the accessible boss realizes being connected with spring housing 7's location.
The top of every supporting seat 8 corresponds and is equipped with a pressure measurement mechanism, and pressure measurement mechanism comprises a pressure head 6 and a pressure sensor 5, and wherein, first pressure sensor 5 is fixed to be set up in the below of 12 top plates of support, and the bottom and the pressure head 6 fixed connection of first pressure sensor 5 for the detection of pressure.
In practical application, spring housing 7 is placed at the top of supporting seat 8, and at this moment, spring housing 7 is located between supporting seat 8 and pressure head 6, and the coaxial line sets up between first pressure sensor 5, pressure head 6, spring housing 7 and the supporting seat 8 that corresponds, and when sliding platform 10 moved upwards, the top of spring housing 7 can contact with pressure head 6 and extrude to utilize first pressure sensor 5 to detect the pressure between spring housing 7 and the pressure head 6, spring housing 7's reaction force promptly.
Through the arrangement, at least two spring shells 7 can be tested simultaneously, the testing efficiency is greatly improved, optimal matching can also be carried out, and the overall quality of the diesel engine is ensured.
The lateral part of support 12 still fixes being equipped with a position sensor 9, and position sensor 9 is vertical to be set up, and position sensor 9's measuring stick and sliding platform 10 fixed connection can extend or shorten along with sliding platform 10's removal to real-time feedback sliding platform 10's position.
Wherein, the first pressure sensor 5 and the position sensor 9 are both connected with the control system 4 so as to display the measured pressure value and the displacement value through the human-computer interaction interface 3.
As shown in fig. 3, the hydraulic system is composed of a first filter 14, an accumulator 15, a reversing valve 16, an overflow valve 17, a liquid level meter 18, a hydraulic oil tank 19, a second filter 20, a hydraulic oil pump 21, a check valve 22 and a second pressure sensor 23;
the hydraulic oil tank 19 is connected to the hydraulic cylinder 11 through an oil inlet pipeline and an oil outlet pipeline respectively, hydraulic oil for driving the hydraulic cylinder 11 to work is contained in the hydraulic oil tank 19, and the oil inlet pipeline and the oil outlet pipeline are connected to the hydraulic cylinder 11 through the reversing valve 16, so that the oil inlet pipeline can independently supply oil to an upper cavity or a lower cavity of the hydraulic cylinder 11, and finally the decompressed hydraulic oil is returned to the hydraulic oil tank 19 through the oil outlet pipeline.
It will be appreciated that the directional valve 16 may be a three-position, four-way solenoid directional valve for the purposes described above.
A second filter 20, a hydraulic oil pump 21, a one-way valve 22, a second pressure sensor 23, a first filter 14 and an energy accumulator 15 are sequentially arranged on the oil inlet pipeline from one end close to the hydraulic oil tank 19 to one end close to the hydraulic cylinder 11;
the hydraulic oil pump 21 is used for pumping hydraulic oil into the hydraulic cylinder 11, the first filter 14 and the second filter 20 are used for filtering the hydraulic oil, the check valve 22 can prevent backflow of the hydraulic oil in the oil inlet pipeline, the energy accumulator 14 can inhibit fluctuation of the hydraulic oil when the reversing valve 16 reverses, the pressure stabilizing effect is achieved, accuracy of a measuring result is guaranteed, and the second pressure sensor 23 is used for detecting oil inlet pressure of the hydraulic oil in the oil inlet pipeline.
A liquid level meter 18 is arranged in the hydraulic oil tank 19 and is used for detecting the liquid level of hydraulic oil in the hydraulic oil tank 19; the oil inlet pipeline is also connected with an overflow pipeline which is also communicated with a hydraulic oil tank 19, and the overflow pipeline is provided with an overflow valve 17 which can effectively prevent the oil circuit from being over-pressurized.
The second pressure sensor 23, the hydraulic oil pump 21 and the reversing valve 16 are all connected with the control system 4, and the control system 4 can control the start and stop of the hydraulic oil pump 21 in the hydraulic system 1 according to the received pressure, counter force and displacement information and initial parameters set by a tester through the human-computer interaction interface 3, and drive the sliding platform 10 to move by controlling the work switching of the upper electromagnetic valve and the lower electromagnetic valve of the reversing valve 16.
The man-machine interface 3 is a control panel, which is connected with the control system 4, and is used for monitoring and controlling the working state of the whole testing device, displaying, storing and printing the test result, setting the initial test condition, and the like.
The control system 4 is internally provided with a static test module and a reliability test module, can perform selection control of static test or reliability test, and can select whether a pressure mode or a displacement mode is adopted through the human-computer interaction interface 3 when the static test is performed, wherein the pressure mode corresponds to the displacement of the spring shell 7 under a given pressure; when the displacement mode corresponds to compressing the spring shell 7 to a specified distance, the accurate elasticity-displacement relation of the spring shell 7 under the static state can be obtained by detecting the elasticity;
during the reliability test, the number of times of dynamic test or the time, the action frequency, the initial prestress or the initial displacement can be flexibly set through the human-computer interaction interface 3, so that the reliability of the spring shell 7 is tested.
Example 2
In another exemplary embodiment of the present invention, a fuel injector spring housing testing method is provided, in which the testing apparatus described in embodiment 1 is applied, and the specific process is as follows:
selecting a corresponding pressure head 6 and a corresponding support seat 8 according to a spring shell 7 to be tested; the pressure head 6 is screwed into the threaded hole of the first pressure sensor 5, and the supporting seat 8 is also screwed into the mounting hole of the sliding platform 10 in the same way;
turning on the power supply of the control system 4, and starting to operate the hydraulic oil pump 21 in the hydraulic system 1;
controlling the sliding platform 10 to move upwards through the human-computer interaction interface 3 until the lower surface of the pressure head 6 is just contacted with the upper surface of the supporting seat 8, and calibrating the position at the moment as an initial position;
after the initial positioning is finished, the sliding platform 10 is controlled to move downwards through the man-machine interaction interface 3, a plurality of spring shells 7 to be tested are correspondingly arranged on the supporting seat 8 matched with the spring shells, and the spring shells 7 and the supporting seat 8 are reliably positioned through the lug boss;
whether a test mode is a static test or a reliability test is selected on the human-computer interaction interface 3, if the test mode is the static test, whether the test mode is a pressure mode or a displacement mode is selected, and after the mode is selected, the control system 4 automatically controls the test device and the hydraulic device to work;
wherein the pressure mode corresponds to detecting the displacement of the spring housing 7 at a given pressure; the displacement mode corresponds to detecting the magnitude of the elastic force when the spring housing 7 is compressed to a specified distance; if the reliability test is selected, the number of test actions or the time, the action frequency, the initial prestress or the initial displacement needs to be set, so that the spring shell 7 compresses and extends according to the given frequency, and the change rule of the performance of the spring shell 7 along with the service time length is monitored.
In the process of pumping hydraulic oil, the hydraulic oil pump 21 sucks hydraulic oil from the hydraulic oil tank 19, the pressurized hydraulic oil reaches the reversing valve 16 through the one-way valve 22 and the first filter 14, when the solenoid valve at the lower position of the reversing valve 16 is electrified, the hydraulic oil enters the lower cavity of the hydraulic cylinder 11, and the hydraulic rod of the hydraulic cylinder 11 drives the sliding platform 10 to move upwards; when the electromagnetic valve at the upper position of the reversing valve 16 is electrified, hydraulic oil enters the upper cavity of the hydraulic cylinder 11, and a hydraulic rod of the hydraulic cylinder drives the sliding platform 10 to move downwards;
clicking on the human-computer interaction interface 3 to start testing and waiting for the completion of the testing;
comparing the elastic force-displacement curve or the elastic force attenuation curve obtained by the test with a design value to obtain whether the static characteristic and the reliability of the tested spring shell 7 are normal or not; by performing a pairing test on a plurality of spring housings 7 or by comparing the test results of them in combination, a group having the closest performance can be selected.
Whether the spring shell of the oil sprayer of the low-speed diesel engine for the ship is normal or not can be judged more intuitively through the operation, and the assembling quality of parts of the diesel engine is improved; the maintenance of turbine managers is facilitated in advance, and the shutdown risk of the diesel engine is reduced; the high cost caused by blind replacement of new parts is reduced during maintenance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a sprayer spring housing testing arrangement, its characterized in that includes control system and the hydraulic system, testboard and the human-computer interaction interface who are connected with control system, the testboard is equipped with the support, the fixed pneumatic cylinder that is equipped with in bottom of support, the pneumatic cylinder is connected with hydraulic system, fixes being equipped with sliding platform on the hydraulic cylinder top hydraulic stem, and sliding platform's top is fixed to be equipped with a plurality of supporting seats, and the top correspondence of every supporting seat is equipped with a pressure measurement mechanism, pressure measurement mechanism is fixed to be set up at the top of support, and the fixed position sensor who is connected with sliding platform that is equipped with of lateral part of support.
2. The fuel injector spring case testing device according to claim 1, wherein the hydraulic rod is located at a center of the sliding platform, and the supporting seats are oppositely arranged on two sides of the hydraulic rod.
3. The fuel injector spring housing testing device according to claim 1, wherein the supporting seat is in threaded connection with the sliding platform, and a boss in positioning connection with the spring housing is arranged at the top of the supporting seat.
4. The fuel injector spring housing testing device according to claim 1, characterized in that the pressure detection mechanism is composed of a pressure head and a first pressure sensor, the first pressure sensor is fixedly arranged at the top of the support, the bottom of the first pressure sensor is fixedly connected with the pressure head, and the first pressure sensor and the position sensor are both connected with the control system.
5. The fuel injector spring case testing device of claim 4, wherein the first pressure sensor is coaxially disposed with the ram and the support base.
6. The fuel injector spring shell testing device according to claim 1, characterized in that the hydraulic system is provided with a hydraulic oil tank, an oil inlet pipeline and an oil outlet pipeline of the hydraulic oil tank are connected with the hydraulic cylinder through a reversing valve, and the reversing valve is connected with a control system.
7. The fuel injector spring shell testing device according to claim 6, wherein a second filter, a hydraulic oil pump, a one-way valve, a second pressure sensor, a first filter and an energy accumulator are sequentially arranged on the fuel inlet pipeline from one end close to the hydraulic oil tank to one end close to the hydraulic cylinder.
8. The fuel injector spring shell testing device according to claim 6, characterized in that an overflow pipeline is further connected to the fuel inlet pipeline, the overflow pipeline is communicated with a hydraulic fuel tank, an overflow valve is arranged on the overflow pipeline, and a liquid level meter is arranged in the hydraulic fuel tank.
9. The fuel injector spring housing testing device according to claim 1, characterized in that a static testing module and a reliability testing module are arranged in the control system, and the testing modes can be switched.
10. A fuel injector spring housing testing method, characterized by using a fuel injector spring housing testing device according to any one of claims 1-9, specifically as follows:
selecting a corresponding pressure head and a corresponding support seat according to the spring shell to be tested and installing;
controlling the sliding platform to move upwards through a human-computer interaction interface until the lower surface of the pressure head is contacted with the upper surface of the supporting seat, and calibrating the position at the moment as an initial position;
controlling the sliding platform to move downwards, and correspondingly installing the spring shell to be tested on the supporting seat;
selecting a test mode on a human-computer interaction interface, and testing;
and after the test is finished, comparing the elastic force-displacement curve or the elastic force attenuation curve obtained by the test with a design value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519776.9A CN115266047A (en) | 2022-05-13 | 2022-05-13 | Oil sprayer spring shell testing device and testing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519776.9A CN115266047A (en) | 2022-05-13 | 2022-05-13 | Oil sprayer spring shell testing device and testing method |
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| CN115266047A true CN115266047A (en) | 2022-11-01 |
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| CN202210519776.9A Pending CN115266047A (en) | 2022-05-13 | 2022-05-13 | Oil sprayer spring shell testing device and testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115979682A (en) * | 2023-03-21 | 2023-04-18 | 山东福阳液压科技有限公司 | Oil gas suspension test system |
-
2022
- 2022-05-13 CN CN202210519776.9A patent/CN115266047A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115979682A (en) * | 2023-03-21 | 2023-04-18 | 山东福阳液压科技有限公司 | Oil gas suspension test system |
| CN115979682B (en) * | 2023-03-21 | 2023-07-18 | 山东福阳液压科技有限公司 | Hydro-pneumatic suspension testing system |
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Address after: 266520 No. 501 Lijiang East Road, Huangdao District, Qingdao, Shandong Applicant after: China Shipbuilding Industry Corporation Diesel ENGINE Co.,Ltd. Address before: 266520 No. 501 Lijiang East Road, Huangdao District, Qingdao, Shandong Applicant before: CHINA SHIPBUILDING INDUSTRY CORPORATION DIESEL ENGINE Co.,Ltd. |
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