CN212338013U - Following type hydraulic vibration damping device and system - Google Patents
Following type hydraulic vibration damping device and system Download PDFInfo
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- CN212338013U CN212338013U CN202021415033.XU CN202021415033U CN212338013U CN 212338013 U CN212338013 U CN 212338013U CN 202021415033 U CN202021415033 U CN 202021415033U CN 212338013 U CN212338013 U CN 212338013U
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Abstract
The invention provides a following hydraulic vibration damping device and a following hydraulic vibration damping system, which relate to the field of vibration damping equipment and comprise a hydraulic cylinder, wherein one end of the hydraulic cylinder is connected with an elastic telescopic mechanism, the other end of the hydraulic cylinder is connected with a ground rail fixing block through a length adjusting mechanism, the elastic telescopic mechanism comprises a telescopic rod coaxially butted with the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring correspondingly extends or shortens along with the action of the telescopic rod; the length adjusting mechanism is used for changing the distance between the hydraulic cylinder and the ground rail fixing block, and the hydraulic cylinder is matched with the elastic telescopic structure, so that the hydraulic supporting force can be automatically adjusted according to the running state of the equipment to be damped, the frequency of an offset test system is adjusted, mechanical resonance generated at partial rotating speed of the equipment is reduced, and the integral protection of the equipment is achieved.
Description
Technical Field
The disclosure relates to the field of vibration reduction equipment, in particular to a following type hydraulic vibration reduction device and system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The vibration of the body structure of the low-speed diesel engine is a common problem of the diesel engine in the bench test process, and quality accidents such as fatigue and even damage of parts can be caused by long-time operation of the diesel engine under an excessive (exceeding standard) structural vibration state.
The vibration of the body structure of the low-speed diesel engine is directly related to the exciting force of the diesel engine, the rotating speed of each working condition of the diesel engine and the installation and fixing structure of the diesel engine, and once the model of the diesel engine and the position of the rack are determined, the vibration condition of the diesel engine under each working condition is determined. The natural vibration frequency of the whole system of the diesel engine can be changed by the change of the connection strength of the diesel engine and the table base, and when the natural vibration frequency of the system is far away from the corresponding frequency of the actual operation working condition of the diesel engine, the system vibration can be improved to a greater extent, and the natural frequency of the system is prone to being adjusted towards the increasing direction under the general condition.
The inventor finds that the existing diesel engine is generally designed and calculated by taking a shipping environment as input during design, and a body and a hull of the diesel engine are supported in a reinforcing way after the diesel engine is shipped, so that the natural vibration frequency of the diesel engine is influenced by the hull support, the natural vibration frequency of a system is far away from the frequency corresponding to the actual operating condition of the diesel engine, and the vibration problem basically reaches the standard. But the diesel engine has no similar supporting structure installed under the condition when the bench test of a manufacturing plant is ground, the diesel engine body is positioned on a ground rail platform, a cushion seat with the length of about 1 meter is added in the middle, and the diesel engine body is fixed by bolts, so that the diesel engine has obvious resonance under partial rotating speed; the manufacturer implements partial reinforcement scheme, the universality is poor, the natural frequency cannot be directionally adjusted up and down according to the target value, the manufacturing cost is high when the diesel engine is of multiple models, and the test requirements of diesel engine manufacturers are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The purpose of the disclosure is to provide a following hydraulic vibration damping device and system aiming at the defects in the prior art, and the hydraulic supporting force can be automatically adjusted according to the running state of the equipment to be damped by matching a hydraulic cylinder with an elastic telescopic structure, so that the frequency of an offset test system is adjusted, mechanical resonance is reduced at partial rotating speed of the equipment, and the whole equipment is protected.
The first purpose of this disclosure is to provide a following formula hydraulic damping device, adopts following technical scheme:
the device comprises a hydraulic cylinder, wherein one end of the hydraulic cylinder is connected with an elastic telescopic mechanism, the other end of the hydraulic cylinder is connected with a ground rail fixing block through a length adjusting mechanism, the elastic telescopic mechanism comprises a telescopic rod which is coaxially butted with the hydraulic cylinder and a spring which is coaxially sleeved on the telescopic rod, and the spring correspondingly extends or shortens along with the action of the telescopic rod; the length adjusting mechanism is used for changing the distance between the hydraulic cylinder and the ground rail fixing block.
Furthermore, one end of the telescopic rod is in butt joint with the end part of the hydraulic cylinder, and the other end of the telescopic rod is used for hinging the equipment to be damped.
Furthermore, the telescopic rod comprises a limiting sleeve and a first connecting rod, one end of the first connecting rod is inserted into the limiting sleeve, one end of the spring is abutted against and pressed on the first connecting rod, the other end of the spring is abutted against and pressed on the limiting sleeve, and the length of the spring changes along with the length change of the first connecting rod in the limiting sleeve.
Further, the length adjusting mechanism comprises a second connecting rod and an adjusting sleeve, one end of the adjusting sleeve is connected with the hydraulic rod of the hydraulic cylinder, and the other end of the adjusting sleeve is connected with the ground rail fixing block through the second connecting rod.
The second purpose of the present disclosure is to provide a hydraulic damping system, which adopts the following technical solutions:
the follow-up hydraulic vibration damping device comprises the follow-up hydraulic vibration damping device, wherein the ground rail fixing block is arranged on a ground rail, the hydraulic cylinder is connected to a hydraulic source, vibration parameters of equipment to be subjected to vibration damping are obtained, and the follow-up hydraulic vibration damping device is controlled to adjust the vibration of the equipment to be subjected to vibration damping.
Furthermore, a plurality of following hydraulic vibration damping devices are matched on the equipment to be damped and are respectively connected with a hydraulic source.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) the hydraulic cylinder is matched with the elastic telescopic structure, so that the hydraulic supporting force can be automatically adjusted according to the running state of the equipment to be damped, the frequency of an offset test system is adjusted, mechanical resonance generated at partial rotating speed of the equipment is reduced, and the integral protection of the equipment is achieved;
(2) the self-adaptive control function is provided, the self-adaptive control method can be simultaneously suitable for the vibration reduction problem in the bench test of low-speed diesel engines with different models and different cylinder numbers, and the cost is saved compared with the overall calculation of a one-to-one reinforcement solution;
(3) the existing structures such as a low-speed diesel engine base, a platform position ground rail and the like are fully utilized in the structural design, the installation and the removal are convenient, the vibration reduction processing time of the diesel engine is greatly reduced, the time of occupying the platform position by the diesel engine in a manufacturing plant is saved, and the production efficiency is improved; the vibration damping control system greatly simplifies the installation and debugging process by recording relevant parameters such as the type, the cylinder number and the like and debugging the diesel engine with the same type and the same cylinder number for a plurality of times.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic diagram of a follower-type hydraulic damping device in embodiments 1, 2 and 3 of the present disclosure in cooperation with a device to be damped;
fig. 2 is a schematic structural diagram of a follower type hydraulic damping device in embodiments 1, 2 and 3 of the present disclosure;
fig. 3 is a schematic flow chart of the rotational speed following control in embodiments 1, 2, and 3 of the present disclosure.
In the figure, 1. diesel engine; 2. hoisting lugs of the diesel engine; 3. a diesel engine mat seat; 4. a ground rail; 10. a rotational speed sensor; 11. a hydraulic support rod; 12. a hydraulic oil pipe; 13. a ground rail fixing block; 14. a hydraulic control station; 15. a speed sensor cable; 21. a first connecting rod; 22. a linear spring; 23. a limiting sleeve; 24. fine adjustment of the nut; 25. a second connecting rod; 26. an oil inlet; 27. a hydraulic cylinder; 28. an oil return port; 29. a piston rod.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
As introduced in the background art, in the prior art, the diesel engine is difficult to effectively support during the test grinding in a manufacturing plant, so that the universality of a part of reinforcement schemes implemented in the manufacturing plant is poor, and the requirement of multi-model reinforcement is difficult to meet; in view of the above problems, the present disclosure provides a following hydraulic damping device and system.
Example 1
In an exemplary embodiment of the present disclosure, a follower-type hydraulic damping device is provided, as shown in fig. 1-3.
The device mainly comprises a hydraulic cylinder, an elastic telescopic mechanism and a length adjusting mechanism, wherein one end of the hydraulic cylinder is connected with the elastic telescopic mechanism, and the other end of the hydraulic cylinder is connected with a ground rail fixing block through the length adjusting mechanism;
the hydraulic cylinder is used as a hydraulic support rod, two ends of the hydraulic cylinder are respectively connected with the elastic telescopic mechanism and the length adjusting structure, a given force is applied to the device to be damped through the hydraulic support rod, the natural frequency of the diesel engine test system is changed, the device to be damped is taken as a diesel engine as an example, the vibration intensity of the diesel engine at each rotating speed can be reduced, and the mechanical resonance phenomenon under specific load is avoided.
The elastic telescopic mechanism extends or shortens under the combined action of external force and the hydraulic cylinder, the internal elastic element is correspondingly stretched and lengthened when the elastic telescopic mechanism extends, and the internal elastic element is correspondingly extruded and shortened when the elastic telescopic mechanism shortens, so that different stretching force or pushing force is externally shown as a whole;
the elastic telescopic mechanism comprises a telescopic rod coaxially butted with the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring correspondingly extends or shortens along with the action of the telescopic rod.
For the length adjusting mechanism, the length adjusting mechanism comprises a second connecting rod and an adjusting sleeve, one end of the adjusting sleeve is connected with a hydraulic rod of the hydraulic cylinder, and the other end of the adjusting sleeve is connected with the ground rail fixing block through the second connecting rod;
the second connecting rod, the adjusting sleeve and the hydraulic rod are connected in a matched mode through threads and are coaxially arranged, and the adjusting sleeve rotates around an axis to adjust the distance between the first connecting rod and the hydraulic rod.
The front end of a piston rod 29 of the hydraulic oil cylinder 27 extending out is designed with an external thread with the length of 20mm, the upper part of the second connecting rod 25 is also designed with an external thread with the length of 20mm, and the second connecting rod 25 is connected with the piston rod 29 through a fine adjustment nut 24. When the hydraulic support rod 11 is installed on site, the oil inlet pressure of the hydraulic oil cylinder 27 is adjusted to be 0, and the piston rod 29 is retracted to the initial position;
can adjust the problem in the head rod, the second connecting rod mounting hole pair through fine setting nut 24, after head rod, second connecting rod pass through bolt locking, eliminate the installation clearance through fine setting nut 24.
One end of the telescopic rod is in butt joint with the end part of the hydraulic cylinder, and the other end of the telescopic rod is used for hinging equipment to be damped; wherein the spring is a linear spring 22;
the telescopic rod comprises a limiting sleeve and a first connecting rod, one end of the first connecting rod is inserted into the limiting sleeve, one end of a spring is pressed on the first connecting rod, the other end of the spring is pressed on the limiting sleeve, and the length of the spring changes along with the length change of the first connecting rod in the limiting sleeve.
In the embodiment, referring to fig. 2, the hydraulic vibration damping device is formed by sequentially connecting a first connecting rod, a linear spring, a limiting sleeve, a hydraulic oil cylinder, an adjusting sleeve and a second connecting rod;
the first connecting rod 21 and the limiting sleeve 23 are in clearance fit and lubricated by grease, so that the first connecting rod can displace in the limiting sleeve at a certain distance;
a linear spring 22 is sleeved between the first connecting rod 21 and the limiting sleeve 23, and the linear spring 22 is limited to perform compression deformation in the axial direction of the first connecting rod 21; when the restraining sleeve 23 applies a pushing force to the linear spring 22, the linear spring 22 transmits the pushing force upward to the first connecting rod 21, thereby transmitting the pushing force to the diesel engine 1.
The limit sleeve 23 is butted with the end part of the hydraulic oil cylinder 27, when the piston rod 29 is driven by the pressure of the hydraulic oil cylinder to eject downwards, the piston rod 29 extends out to be blocked by the second connecting rod, the hydraulic oil cylinder and the limit sleeve 23 move upwards together by the counterforce, and the linear spring 22 is pushed to generate compression deformation.
The adjusting sleeve is a fine adjusting nut with threaded holes at two ends, can be respectively matched with the threads at the tail end of the piston rod of the hydraulic oil cylinder and the threads at the tail end of the second connecting rod, and can adjust the relative positions of the piston rod of the hydraulic oil cylinder and the tail end of the second connecting rod through rotation.
The end parts of the connecting rods, which are used for being matched with an external structure, can be set to be U-shaped structures so as to facilitate the adjustment of the first connecting rod and the second connecting rod with the outside, and the connecting rods can be matched and fixed with the diesel engine hoisting lug 2 and the ground rail fixing block 13 through bolts;
the positioning in the length direction can be conveniently carried out through the fine adjustment nut, manual pre-tightening can be carried out when the damping device is installed for the first time, and the linear spring is located at the zero point after the damping device is integrally fixed.
When the hydraulic support rod 11 is installed for the first time, the output oil pressure of the hydraulic control station 14 is set to be zero, and the hydraulic cylinder piston 29 is recovered to the initial position;
the oil inlet 26 and the oil return 28 of the hydraulic oil cylinder 27 are connected to an external hydraulic source through a hydraulic oil pipe 12, in this embodiment, the hydraulic source may be the hydraulic control station 14, and the hydraulic oil pipe is a high-pressure armored hose.
When the pressure of the oil inlet of the hydraulic cylinder 27 is increased, the piston rod 29 of the hydraulic cylinder is pushed to extend downwards, the reaction force of the hydraulic cylinder can enable the limiting sleeve 23 to move upwards, the limiting sleeve applies pushing force to the linear spring 22, the linear spring 22 is linearly deformed, and the force acts on the base of the diesel engine 1 at the same time.
The magnitude of the acting force is in direct proportion to the hydraulic pressure of the hydraulic cylinder, so that controllable and predictable supporting force can be obtained by providing controllable and predictable oil supply pressure for the hydraulic cylinder 27, and further the inherent vibration frequency deviation control of the diesel engine 1 test system is realized. The calculation of the hydraulic pressure is derived from parameters such as the rotating speed of the diesel engine, the type of the diesel engine, the number of cylinders and the like.
The hydraulic cylinder is matched with the elastic telescopic structure, and the hydraulic supporting force can be automatically adjusted according to the running state of the equipment to be damped, so that the frequency of an offset test system is adjusted, mechanical resonance generated at partial rotating speed of the equipment is reduced, and the whole equipment is protected.
Example 2
In another exemplary embodiment of the present disclosure, a hydraulic dampening system is presented, as shown in fig. 1-3.
Comprising a plurality of follow-on hydraulic damping devices and control systems as described in embodiment 1; wherein the hydraulic oil cylinder is connected to a hydraulic control station;
referring to fig. 1, two or four hydraulic support rods 11 are symmetrically distributed near the free end and the driving end of a low-speed diesel engine 1, and two ends of the hydraulic support rods are connected between a hoisting lug 2 of a diesel engine base and a rack ground rail 4; the diesel engine is installed on the ground rail through the diesel engine cushion seat.
The natural frequency of the diesel engine test system is changed by applying a given force to the diesel engine 1 through the hydraulic support rod 11, so that the vibration intensity of the diesel engine 1 at each rotating speed can be reduced, and the mechanical resonance phenomenon under a specific load can be avoided.
The hydraulic control station 14 is provided with a variable frequency pump station, a PLC control cabinet and a man-machine interaction operation interface; the control system is divided into a manual mode and an automatic mode.
In a manual mode, the rotating speed of a diesel engine is not controlled in a following mode, and a user manually sets hydraulic supporting force through a human-computer interface and generally applies the hydraulic supporting force to system debugging;
under the automatic mode, the PLC switch board obtains the current rotational speed of diesel engine 1 through speed sensor 10, according to model data, the automatic target hydraulic pressure of seeking of rotational speed pressure curve diagram of storing in advance, realizes that the hydraulic strut bar exerts different power to diesel engine 1 under the different rotational speeds to realize wideer scope, more accurate damping effect.
Compared with the traditional vibration damping device, the hydraulic vibration damping device adopting following control is adopted to improve the problem of larger vibration intensity of the low-speed diesel engine by applying a controlled and comparable case mode to the diesel engine;
the vibration reduction problem of the low-speed diesel engine bench test system with multiple types and different cylinder numbers can be solved by one set of system through an automatic mode by setting the type number of the engine and a real-time rotating speed signal and automatically adjusting the force, the system is suitable for multiple types of engines, is suitable for bench test of low-speed diesel engine manufacturing plants, and saves the cost compared with the traditional one-to-one reinforcement solution.
Example 3
In yet another exemplary embodiment of the present disclosure, a method of hydraulic dampening is provided.
With the hydraulic damping system as disclosed in embodiment 2, comprising the steps of;
fixing a plurality of following hydraulic vibration damping devices and equipment to be subjected to vibration damping on a ground rail, respectively connecting a plurality of corresponding hydraulic cylinders to a hydraulic source, and connecting the hydraulic cylinders to the equipment to be subjected to vibration damping through an elastic telescopic mechanism;
tensioning the following hydraulic vibration damper through a length adjusting mechanism to enable the spring to be at a zero position and the hydraulic cylinder to be at an initial position;
after the vibration damping equipment is started, the hydraulic cylinder is driven to act, the action of the following hydraulic vibration damping device on the equipment to be damped is changed, and the vibration parameters of the equipment to be damped are adjusted until the requirement is met;
recording the model of the equipment to be damped and adjusting the state of the follow-up hydraulic damping device after the requirement is met, corresponding the model to be damped, and applying the follow-up hydraulic damping device meeting the requirement to the equipment to be damped of the same model.
In this embodiment, referring to fig. 3, a rotation speed sensor 10 is installed at a free end of a low-speed diesel engine 1, the rotation speed sensor is connected to a hydraulic control station through a rotation speed sensor cable 15, a rotation speed signal of the diesel engine 1 enters a hydraulic control station 14, and the rotation speed information of the diesel engine 1 is converted and calculated by a high-speed pulse input module of a PLC control cabinet;
the PLC control program prestores the rotating speed-supporting force chart data corresponding to different low-speed diesel engine models (and different cylinder numbers), when the hydraulic control station 14 is set to an automatic mode, the system program can inquire the size of the supporting force required to be applied by the current hydraulic supporting rod 11 according to the diesel engine rotating speed signal acquired in real time and the prestored chart data, and calculate the target oil pressure P output by the hydraulic station in real time through conversioni；
The control program calculates a target oil pressure PiThen, the real-time hydraulic pressure P is obtained by the outlet pressure sensor of the hydraulic stationoThe PID adjustment algorithm is used for calculating the frequency of the frequency converter to control the rotating speed of the variable frequency pump motor so as to dynamically adjust the oil supply pressure of the hydraulic cylinder 27.
Thereby realize that hydraulic support pole 11 exerts a variable holding power of following the rotational speed for diesel engine 1, realize wide range, more accurate damping effect.
The rotating speed feedback control is adopted, so that the inherent frequency offset of the diesel engine under different rotating speed loads can be changed in real time, the vibration damping processing range is wider than that of a fixed support vibration damping device, and the adaptability is strong; the control module memorizes the relevant parameters of the type, the cylinder number and the like, and the diesel engine with the same type and the same cylinder number is debugged once and used for multiple times, so that the installation and debugging process is greatly simplified.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A following hydraulic vibration damper is characterized by comprising a hydraulic cylinder, wherein one end of the hydraulic cylinder is connected with an elastic telescopic mechanism, the other end of the hydraulic cylinder is connected with a ground rail fixing block through a length adjusting mechanism, the elastic telescopic mechanism comprises a telescopic rod coaxially butted with the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring correspondingly extends or shortens along with the action of the telescopic rod; the length adjusting mechanism is used for changing the distance between the hydraulic cylinder and the ground rail fixing block.
2. The follow-on hydraulic damping device according to claim 1, wherein one end of the telescopic rod is butted against the end of the hydraulic cylinder, and the other end is used for hinging the equipment to be damped.
3. The follow-on hydraulic damping device according to claim 2, wherein the telescopic rod comprises a limiting sleeve and a first connecting rod, one end of the first connecting rod is inserted into the limiting sleeve, one end of the spring is pressed against the first connecting rod, the other end of the spring is pressed against the limiting sleeve, and the length of the spring changes with the change of the length of the first connecting rod in the limiting sleeve.
4. The follow-on hydraulic damping device according to claim 1, wherein the length adjustment mechanism comprises a second connecting rod and an adjustment sleeve, one end of the adjustment sleeve is connected with the hydraulic rod of the hydraulic cylinder, and the other end of the adjustment sleeve is connected with the ground rail fixing block through the second connecting rod.
5. A follower hydraulic vibration damper according to claim 4, wherein the second connecting rod, the adjusting sleeve and the hydraulic rod are connected in turn by screw-fitting and are coaxially arranged, and the adjusting sleeve adjusts the distance between the first connecting rod and the hydraulic rod by rotating about the axis.
6. A hydraulic damping system comprising a follower hydraulic damping device according to any one of claims 1 to 5.
7. The hydraulic damping system according to claim 6, wherein the ground rail fixing block is mounted on the ground rail, the hydraulic cylinder is connected to a hydraulic source to obtain vibration parameters of the equipment to be damped, and the follow-up hydraulic damping device is controlled to adjust the vibration of the equipment to be damped.
8. The hydraulic vibration damping system according to claim 7, wherein the hydraulic source is a variable frequency pump station, and the variable frequency pump station is connected with a PLC control cabinet for controlling the variable frequency pump station.
9. The hydraulic damping system according to claim 6, wherein the plurality of follow-up hydraulic damping devices are arranged on the ground rail at intervals and are connected with the equipment to be damped.
10. A hydraulic damping system according to claim 9, characterized in that the following hydraulic damping means are connected at least one at the drive end of the device to be damped and at least one at the free end of the device to be damped.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021415033.XU CN212338013U (en) | 2020-07-16 | 2020-07-16 | Following type hydraulic vibration damping device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021415033.XU CN212338013U (en) | 2020-07-16 | 2020-07-16 | Following type hydraulic vibration damping device and system |
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| CN212338013U true CN212338013U (en) | 2021-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111895033A (en) * | 2020-07-16 | 2020-11-06 | 中国船舶重工集团柴油机有限公司 | Following type hydraulic vibration damping device, system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111895033A (en) * | 2020-07-16 | 2020-11-06 | 中国船舶重工集团柴油机有限公司 | Following type hydraulic vibration damping device, system and method |
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Address after: 266520 No. 501 Lijiang East Road, Huangdao District, Qingdao, Shandong Patentee after: China Shipbuilding Industry Corporation Diesel ENGINE Co.,Ltd. Address before: 266520 No. 501 Lijiang East Road, Huangdao District, Qingdao, Shandong Patentee before: CHINA SHIPBUILDING INDUSTRY CORPORATION DIESEL ENGINE Co.,Ltd. |
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