CN116085356A - Disassembly-free maintenance component of jacking hydraulic system of tower crane - Google Patents
Disassembly-free maintenance component of jacking hydraulic system of tower crane Download PDFInfo
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- CN116085356A CN116085356A CN202310364162.2A CN202310364162A CN116085356A CN 116085356 A CN116085356 A CN 116085356A CN 202310364162 A CN202310364162 A CN 202310364162A CN 116085356 A CN116085356 A CN 116085356A
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- oil
- column
- hole
- oil passing
- locking rod
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- 238000012423 maintenance Methods 0.000 title claims abstract description 28
- 239000003921 oil Substances 0.000 claims abstract description 228
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000009194 climbing Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/005—Filling or draining of fluid systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Jib Cranes (AREA)
Abstract
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane comprises a hydraulic oil storage tank bottom plate and a screw plug, wherein the screw plug is in threaded fit with a through hole sealing tube on the hydraulic oil storage tank bottom plate, the upper surface of the screw plug is not higher than the upper surface of the hydraulic oil storage tank bottom plate, the screw plug is provided with an oil column hole, an oil column is slidably arranged in the oil column hole in an oil-tight manner, the top of the oil column is not communicated, and the bottom of the oil column is communicated with an oil hole on the side surface; the upper part of the oil passing column is pressed on the spigot of the oil passing column hole of the screw plug by the oil passing column elastic part, and the upper surface of the oil passing column is not higher than the upper surface of the screw plug; when oil is discharged, the oil receiving pipe is used for pushing the oil passing column upwards from the lower part of the oil passing column, the oil passing column compresses the oil passing column elastic component, the oil passing hole arranged on the side face of the oil passing column exposes out of the upper surface of the screw plug, oil flows into the oil receiving pipe from the oil passing hole, after oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug, and the oil passing column elastic component resets the oil passing column.
Description
Technical Field
The invention relates to the technical field of maintenance of hydraulic systems of tower cranes, in particular to a disassembly-free maintenance component of a jacking hydraulic system of a tower crane.
Background
The jacking hydraulic system of the tower crane mainly comprises a hydraulic oil storage tank, a whole set of oil supply loop and related controls, wherein the hydraulic oil storage tank is arranged around the working of the jacking oil cylinder, the hydraulic oil needs to be periodically replaced in working, and the climbing operation is generally required based on the working specificity of the tower crane. In the prior art, a screw hole is generally formed in a bottom plate of a hydraulic oil storage tank, a screw plug is used for plugging the bottom plate, oil in a containing cavity of the hydraulic oil storage tank can be cleaned up during oil change maintenance, an oil drain screw hole in the bottom plate of the hydraulic oil storage tank is generally formed in the position of the approximate center of the bottom plate of the hydraulic oil storage tank, and the screw plug cannot exceed the plane of the bottom plate of the hydraulic oil storage tank when plugging the oil drain screw hole due to safe and reliable design, and the oil drain screw hole also has to be vertically arranged. The oil drain screw hole is inconvenient in actual operation, when oil is drained, oil in the containing cavity of the hydraulic oil storage tank begins to flow out or splash at the moment of disassembling the screw plug, the oil cannot be connected into the oil receiving disc or the barrel in a vertical horse mode, pollution of operators and equipment below the bottom of the hydraulic oil storage tank is easily caused, the screw plug is required to be disassembled by the operators under the condition that the oil continuously flows out, climbing and ascending operation are high in cost and difficult, the operation space on the equipment is limited, and various inconvenient factors are increased.
Disclosure of Invention
In order to solve the problems, the invention provides a disassembly-free maintenance component of a jacking hydraulic system of a tower crane, plug and play can be realized by inserting an oil receiving pipe into the structure, the shape of the oil outlet end of the oil receiving pipe is not required, the end of the oil receiving pipe can be set into any shape convenient to operate according to the needs, the oil receiving pipe is used for jacking an oil passing column in a screw plug, the cavity of a hydraulic oil storage tank is communicated with the oil receiving pipe, and the risk of oil leakage is reduced by arranging a locking device on the oil passing column.
The aim of the invention is achieved by the following technical scheme.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane comprises a hydraulic oil storage tank bottom plate and a screw plug, wherein the screw plug is in threaded fit with a through hole sealing tube on the hydraulic oil storage tank bottom plate, the upper surface of the screw plug is not higher than the upper surface of the hydraulic oil storage tank bottom plate, the screw plug is provided with an oil column hole, an oil column is slidably arranged in the oil column hole in an oil-tight manner, the top of the oil column is not communicated, and the bottom of the oil column is communicated with an oil hole on the side surface; the upper part of the oil passing column is pressed on the spigot of the oil passing column hole of the screw plug by the oil passing column elastic part, and the upper surface of the oil passing column is not higher than the upper surface of the screw plug; when oil is discharged, the oil receiving pipe is used for pushing the oil passing column upwards from the lower part of the oil passing column, the oil passing column compresses the oil passing column elastic component, the oil passing hole arranged on the side face of the oil passing column exposes out of the upper surface of the screw plug, oil flows into the oil receiving pipe from the oil passing hole, after oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug, and the oil passing column elastic component resets the oil passing column.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane is characterized in that the oil column elastic component is a top cover spring.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane is characterized in that the top cover spring is arranged between the top cover and the oil column; the top cover is fixedly connected to the screw plug.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane is provided with the oil column locking device.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane comprises the oil column locking device, wherein the oil column locking device comprises a locking rod and a locking rod elastic component; the locking part of the locking rod is matched with the locking groove on the oil passing column; when no oil pipe is connected in the screw plug, the locking rod is pressed by the locking rod elastic part, so that the locking part of the locking rod is clamped into the locking groove on the oil passing column; when oil is discharged, the oil receiving pipe props against the pushing part of the locking rod, the locking part of the locking rod and the pushing part of the locking rod synchronously move to withdraw from the locking groove on the oil passing column, and the locking rod elastic part is compressed; when oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug, the locking rod elastic part resets the locking rod, and the locking part of the locking rod is blocked into the locking groove on the oil passing column again.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane is characterized in that the locking rod elastic component is a locking rod spring.
As the tower crane jacking hydraulic system maintenance-free component is provided, the oil column and the oil column hole are sealed by the sealing ring.
The disassembly-free maintenance component of the jacking hydraulic system of the tower crane is characterized in that a sealing groove and a sealing ring are arranged at the lower part of the oil passing column hole, and after the oil receiving pipe is inserted into the oil passing column hole, the oil receiving pipe and the oil passing column hole are sealed through the sealing ring.
The beneficial effects are that:
the disassembly-free maintenance component of the jacking hydraulic system of the tower crane can realize plug and play by inserting the oil receiving pipe into the structure, has no special requirement on the shape of the oil outlet end of the oil receiving pipe, and can be arranged into any shape convenient to operate according to the requirement.
According to the disassembly-free maintenance component of the jacking hydraulic system of the tower crane, the oil column in the screw plug is jacked up by the oil receiving pipe, so that the cavity of the hydraulic oil storage tank is communicated with the oil receiving pipe.
According to the disassembly-free maintenance component of the jacking hydraulic system of the tower crane, the locking device is arranged on the oil column, so that oil leakage caused by the influence of vibration on the oil column is avoided.
Drawings
The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
fig. 1 is a schematic diagram of a maintenance-free component of a lifting hydraulic system of a tower crane according to an embodiment of the invention.
Fig. 2 is a cross-sectional view A-A of fig. 1.
The components represented by the reference numerals in the figures are:
the hydraulic oil storage tank comprises a 1-hydraulic oil storage tank bottom plate, a 2-screw plug, a 3-oil passing column, a 4-top cover, a 5-top cover spring, a 6-locking rod and a 7-locking rod spring.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, the maintenance-free parts of the jacking hydraulic system of the tower crane comprise a hydraulic oil tank bottom plate 1 and a screw plug 2, the conventional method is that a hole which is communicated with the cavity of the hydraulic oil tank body is formed in the hydraulic oil tank bottom plate 1, then the screw plug 2 is plugged by adopting a 55-degree sealed pipe in threaded fit with the hydraulic oil tank bottom plate 1, when the screw plug 2 is screwed onto the hydraulic oil tank bottom plate 1, oil in the cavity of the hydraulic oil tank body cannot flow out, when oil is required to be discharged, the screw plug 2 is unscrewed from the hydraulic oil tank bottom plate 1, and the oil flows out from the hole of the hydraulic oil tank bottom plate 1. After the structure of the screw plug 2 is improved, as shown in the figure, the upper surface of the screw plug 2 is not higher than the upper surface of the bottom plate 1 of the hydraulic oil storage tank, an oil passing column hole is formed in the screw plug 2, an oil passing column 3 is slidably arranged in the oil passing column hole in an oil-tight manner, the top of the oil passing column 3 is not communicated, and the bottom of the oil passing column 3 is communicated with an oil passing hole on the side face; the upper part of the oil passing column 3 is pressed on the spigot of the oil passing column hole of the screw plug 2 by the top cover spring 5, and the spigot has the function of limiting the downward limit position of the oil passing column 3 so that the oil passing column 3 can not move downwards any more; when oil is discharged, the oil receiving pipe is used for pushing the oil passing column 3 upwards from the lower part of the oil passing column 3, the oil passing column 3 compresses the top cover spring 5, the oil passing hole arranged on the side face of the oil passing column 3 can expose the upper surface of the screw plug 2 along with the upward pushing of the oil passing column 3, oil flows into the oil receiving pipe from the oil passing hole, after the oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug 2, the top cover spring 5 resets the oil passing column 3, and the oil passing hole is blocked by the oil passing column hole and cannot leak oil.
Specifically, the top cover spring 5 is disposed between the top cover 4 and the oil passing column 3; the top cover 4 is fixedly connected to the screw plug 2 through bolts, the top cover spring 5 is sleeved on the cylindrical boss in the middle of the top cover 4, holes for enabling the inside of the top cover 4 to be communicated with the outside of the top cover 4 are formed in the periphery of the top cover 4, oil in the containing cavity of the hydraulic oil storage tank body can flow out from the top cover 4 into the top cover 4, and particularly, the holes of the top cover 4 are not higher than the upper surface of the screw plug 2 or the hydraulic oil storage tank bottom plate 1.
The hydraulic oil flows to cause vibration, the tower crane works under the influence of load or wind power to generate certain vibration, and sometimes the vibration can cause the oil column 3 to overcome the force of the top cover spring 5 and move up and down, so that oil leakage is easy to occur, and the oil column locking device is arranged on the disassembly-free maintenance component of the jacking hydraulic system of the tower crane.
The oil column locking device comprises a locking rod 6 and a locking rod spring 7; the locking rod 6 comprises a locking part and a pushing part, and the locking part of the locking rod 6 is matched with a locking groove arranged on the oil column 3; when no oil pipe is connected in the screw plug 2, the locking rod 6 is pressed by the locking rod spring 7, so that the locking part of the locking rod 6 is clamped into the locking groove on the oil passing column 3; when oil is discharged, the oil receiving pipe is propped against the pushing part of the locking rod 6, the pushing part of the locking rod 6 is arranged into an inclined plane, the oil receiving pipe can gradually push the locking rod 6 outwards along with the contact with the inclined plane, the locking part of the locking rod 6 and the pushing part of the locking rod 6 are fixed into a whole, as shown in fig. 2, the locking part of the locking rod 6 and the pushing part of the locking rod 6 can slide along the groove in the corresponding groove arranged on the screw plug 2, the locking part of the locking rod 6 moves outwards gradually so that the locking part of the locking rod 6 which moves synchronously with the locking part withdraws from the locking groove on the oil column 3, and at the moment, the locking rod spring 7 is compressed; after oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug 2, the locking rod spring 7 resets the locking rod 6, the oil passing column 3 is reset after the top cover spring 5 resets, and the locking part of the locking rod 6 is blocked into the locking groove on the oil passing column 3 again, so that the oil passing column 3 is locked to be incapable of moving up and down.
In order to ensure that oil leakage can not occur between the oil passing column 3 and the oil passing column hole, the oil passing column 3 and the oil passing column hole are sealed through a sealing ring, a sealing groove is formed in the oil passing column 3, and the sealing ring is arranged during installation.
In order to ensure that oil leakage can not occur between the oil receiving pipe and the oil passing column barrel, a sealing groove and a sealing ring are arranged at the lower part of the oil passing column hole, and after the oil receiving pipe is inserted into the oil passing column hole, the oil receiving pipe and the oil passing column hole are sealed through the sealing ring.
The oil receiving pipe can be communicated with the oil receiving pipe by only inserting one end of the oil receiving pipe into the oil column hole, and the other end of the oil receiving pipe is arranged into a required shape according to the requirement, so that different requirements can be met, for example, the other end of the oil receiving pipe is provided with a long right angle shape, and the original vertical oil hole can be changed into a horizontal direction; or the other end of the oil receiving pipe is connected with a hose, so that the direction can be changed at will.
Finally, in order to facilitate screwing the screw plug 2 into or out of the hydraulic oil tank bottom plate 1, the bottom of the oil column hole is machined into a hexagon shape, so that the screw plug 2 can be screwed by using a tool.
Therefore, the whole effect of the disassembly-free maintenance part of the jacking hydraulic system of the tower crane can be seen, and particularly, the plug and play can be realized by inserting the oil receiving pipe into the device, and the shape of the oil outlet end of the oil receiving pipe is free from special requirements and further vibration and leakage are avoided.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a tower crane jacking hydraulic system non-dismantling maintenance part, includes hydraulic oil storage tank bottom plate (1) and plug screw (2), and the through-hole seal tube screw thread fit on plug screw (2) and the hydraulic oil storage tank bottom plate (1), and the upper surface of plug screw (2) is not higher than the upper surface of hydraulic oil storage tank bottom plate (1), its characterized in that, plug screw (2) is provided with leads to oil column hole, and lead to oil column (3) slidable oil-tight ground place in leads to oil column hole, lead to oil column (3) top and be not led to, lead to oil column (3) bottom and side to have the oil hole to communicate with each other; the upper part of the oil passing column (3) is pressed on the spigot of the oil passing column hole of the screw plug (2) by an oil passing column elastic part; when oil is discharged, the oil receiving pipe is used for pushing the oil passing column (3) upwards from the lower part of the oil passing column (3), the oil passing column (3) compresses the oil passing column elastic component, the oil passing hole arranged on the side face of the oil passing column (3) exposes out of the upper surface of the screw plug (2), oil flows into the oil receiving pipe from the oil passing hole, after oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug (2), and the oil passing column elastic component resets the oil passing column (3).
2. The disassembly-free maintenance component of the jacking hydraulic system of the tower crane according to claim 1, wherein the oil column elastic component is a top cover spring (5).
3. The disassembly-free maintenance component of a jacking hydraulic system of a tower crane according to claim 2, wherein the top cover spring (5) is arranged between the top cover (4) and the oil column (3); the top cover (4) is fixedly connected to the screw plug (2).
4. A tower crane jacking hydraulic system disassembly-free maintenance component according to any one of claims 1-3, wherein the tower crane jacking hydraulic system disassembly-free maintenance component is provided with an oil column locking device.
5. The disassembly-free maintenance component of the jacking hydraulic system of the tower crane according to claim 4, wherein the oil column locking device comprises a locking rod (6) and a locking rod elastic component; the locking part of the locking rod (6) is matched with a locking groove on the oil passing column (3); when no oil pipe is connected in the screw plug (2), the locking rod (6) is pressed by the locking rod elastic part, so that the locking part of the locking rod (6) is clamped into the locking groove on the oil passing column (3); when oil is discharged, the oil receiving pipe props against the pushing part of the locking rod (6), the locking part of the locking rod (6) and the pushing part of the locking rod (6) synchronously move to withdraw from the locking groove on the oil passing column (3), and the locking rod elastic part is compressed; after oil discharge is finished, the oil receiving pipe is pulled out of the oil passing column hole of the screw plug (2), the locking rod elastic component resets the locking rod (6), and the locking part of the locking rod (6) is clamped into the locking groove on the oil passing column (3) again.
6. The disassembly-free maintenance component of the jacking hydraulic system of the tower crane according to claim 5, wherein the locking rod elastic component is a locking rod spring (7).
7. The disassembly-free maintenance component of a jacking hydraulic system of a tower crane according to claim 1, wherein the oil column (3) and the oil column hole are sealed by a sealing ring.
8. The disassembly-free maintenance component of a jacking hydraulic system of a tower crane according to claim 1, wherein a sealing groove and a sealing ring are arranged at the lower part of the oil passing column hole, and after the oil receiving pipe is inserted into the oil passing column hole, the oil receiving pipe and the oil passing column hole are sealed by the sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310364162.2A CN116085356A (en) | 2023-04-07 | 2023-04-07 | Disassembly-free maintenance component of jacking hydraulic system of tower crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310364162.2A CN116085356A (en) | 2023-04-07 | 2023-04-07 | Disassembly-free maintenance component of jacking hydraulic system of tower crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116085356A true CN116085356A (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310364162.2A Pending CN116085356A (en) | 2023-04-07 | 2023-04-07 | Disassembly-free maintenance component of jacking hydraulic system of tower crane |
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| CN (1) | CN116085356A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999051860A1 (en) * | 1998-04-06 | 1999-10-14 | Tamotsu Takahara | Oil drain plug of engine |
| US20040036049A1 (en) * | 2002-08-26 | 2004-02-26 | Symonds Robert D. | Fluid drain assembly |
| US20050098384A1 (en) * | 2003-11-12 | 2005-05-12 | Chang Hsueh C. | Structure automobile engine crankcase oil drain tap plug |
| CN201116479Y (en) * | 2007-11-12 | 2008-09-17 | 李祖培 | Engine oil removing device |
| WO2012031706A1 (en) * | 2010-08-30 | 2012-03-15 | Martin Maszull | Oil drain device |
| CN103195539A (en) * | 2012-01-10 | 2013-07-10 | 北汽福田汽车股份有限公司 | Drain plug assembly |
| CN211144602U (en) * | 2019-11-29 | 2020-07-31 | 浙江强能胜动力股份有限公司 | Anti-drop's engine oil drain bolt |
| CN111706418A (en) * | 2020-06-28 | 2020-09-25 | 东莞市嘉宏机电科技有限公司 | Oil drain device of engine oil pan |
| CN113669133A (en) * | 2021-09-30 | 2021-11-19 | 浙江瑞利动力科技有限公司 | Oil drain bolt assembly structure of oil pan assembly |
-
2023
- 2023-04-07 CN CN202310364162.2A patent/CN116085356A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999051860A1 (en) * | 1998-04-06 | 1999-10-14 | Tamotsu Takahara | Oil drain plug of engine |
| US20040036049A1 (en) * | 2002-08-26 | 2004-02-26 | Symonds Robert D. | Fluid drain assembly |
| US20050098384A1 (en) * | 2003-11-12 | 2005-05-12 | Chang Hsueh C. | Structure automobile engine crankcase oil drain tap plug |
| CN201116479Y (en) * | 2007-11-12 | 2008-09-17 | 李祖培 | Engine oil removing device |
| WO2012031706A1 (en) * | 2010-08-30 | 2012-03-15 | Martin Maszull | Oil drain device |
| CN103195539A (en) * | 2012-01-10 | 2013-07-10 | 北汽福田汽车股份有限公司 | Drain plug assembly |
| CN211144602U (en) * | 2019-11-29 | 2020-07-31 | 浙江强能胜动力股份有限公司 | Anti-drop's engine oil drain bolt |
| CN111706418A (en) * | 2020-06-28 | 2020-09-25 | 东莞市嘉宏机电科技有限公司 | Oil drain device of engine oil pan |
| CN113669133A (en) * | 2021-09-30 | 2021-11-19 | 浙江瑞利动力科技有限公司 | Oil drain bolt assembly structure of oil pan assembly |
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