CN109186707B - Oil level indicator test device and test method thereof - Google Patents
Oil level indicator test device and test method thereof Download PDFInfo
- Publication number
- CN109186707B CN109186707B CN201811120338.5A CN201811120338A CN109186707B CN 109186707 B CN109186707 B CN 109186707B CN 201811120338 A CN201811120338 A CN 201811120338A CN 109186707 B CN109186707 B CN 109186707B
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- oil level
- level indicator
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 82
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims description 25
- 238000007906 compression Methods 0.000 claims description 25
- 230000000694 effects Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/02—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an oil level indicator test device which comprises a water tank filled with liquid, a base, a guide pillar, a sliding plate, a sealing tool, a driving mechanism and an elastic part, wherein the base is positioned in the water tank, the lower end of the guide pillar is fixedly connected with the base, the upper end of the guide pillar is fixedly provided with a top plate, the sliding plate can slide up and down along the guide pillar, the sealing tool is connected with an oil level indicator to be tested through a sealing ring, the driving mechanism is fixedly arranged on the top plate and is used for pushing the oil level indicator to be tested downwards, the elastic part provides an upward supporting force for the sliding plate, and when the driving mechanism does not push the oil level indicator to be tested, the elastic part supports the sliding plate above the liquid level in the water tank. The invention has the characteristics of simple operation, low labor intensity, high test efficiency and the like; meanwhile, the problems that the existing internal threads of the existing test tools are easy to damage or pollute the external threads of the oil level indicator and the like can be avoided. The invention also relates to a test method of the oil level indicator test device.
Description
Technical Field
The invention relates to the technical field of oil level indicator test and inspection, in particular to an oil level indicator test device and an oil level indicator test method.
Background
The existing oil level indicator is usually connected to a gear box through an externally threaded interface to indicate the level of the oil level, as in patent document 1 (publication No. CN 204300318U). The number of oil level indicators produced in the factory is large, and each product leaves the factory to be subjected to airtight detection. Referring to fig. 1, the test flow of the existing test fixture is specifically as follows:
1. the sealing tool 3 is fixed on the vice;
2. the oil level indicator 1 is connected to the sealing tool 3 through external threads, the sealing work 3 and the oil level indicator 14 are screwed tightly through manual modes, the screwing torque is large (not less than 15 N.m), and the oil level indicator 14 and the sealing work 3 are sealed through a sealing ring 15;
3. the sealing work 3 and the oil level indicator 14 are connected and then taken down from the vice, and the air pipe for test is connected with the air pipe quick connector 32 of the sealing tool 3;
4. placing the sealing work 3 and the oil level indicator 14 into a water tank to be completely immersed in water, opening an air switch of compressed gas, and adjusting air pressure to perform a test;
5. after the test is completed, the air switch is closed, and the air pipe for the test is pulled out from the air pipe quick connector 32 of the sealing work 3;
6. the sealing work 3 is fixed on the vice and the oil level indicator 14 is detached from the tool manually.
The existing test tool is simple in structure, long in test time and high in labor intensity, and each product needs a long test time; in addition, the existing tool also has the problems that the tool and the oil level indicator thread are not fastened in place, so that the test is distorted, the tool internal thread easily damages or pollutes the oil level indicator external thread, and the like.
Disclosure of Invention
The invention provides an oil level indicator test device and an oil level indicator test method, which aim to solve the technical problems that the labor intensity is high, the test efficiency is low, the tool damages or pollutes the external threads of products and the like in the existing oil level indicator test process.
An oil level indicator test apparatus, comprising:
a water tank having a liquid therein;
the base is positioned in the water tank;
the lower end of the guide post is fixedly connected with the base, and the upper end of the guide post is fixedly provided with a top plate;
the sliding plate can slide up and down along the guide post;
the sealing tool is arranged on the sliding plate and is provided with a cylinder part, the top end of the cylinder part is provided with a sealing ring for connecting the cylinder part and an oil level indicator to be tested, and the inner cavity of the cylinder part is communicated with an air source for the test;
the driving mechanism is used for pushing the oil level indicator to be tested downwards and is fixedly arranged on the top plate; and
and an elastic component for providing upward supporting force for the sliding plate, wherein the elastic component supports the sliding plate above the liquid level in the water tank when the driving mechanism does not push the oil level indicator to be tested.
Further, the oil level indicator test device further comprises a pull rod, wherein the bottom end of the pull rod is fixedly connected with the sliding plate, and the pull rod movably penetrates through the top plate; the elastic component is the cover and is established the pull rod is located the first compression spring of the part above the roof, the lower extreme butt of first compression spring in the upper surface of roof, the upper end butt of first compression spring in set up in adjusting nut on the pull rod.
Further, the elastic component is an extension spring, the lower end of the extension spring is fixedly connected with the sliding plate, and the upper end of the extension spring is fixedly connected with the top plate.
Further, the elastic component is a second compression spring, the upper end of the second compression spring is abutted to the lower surface of the sliding plate, and the lower end of the second compression spring is abutted to the base or the water tank.
Further, a limiting piece for limiting the upper limit position of the sliding plate is arranged on the guide post.
Further, a pushing component is arranged on a driving rod of the driving mechanism, a mounting plate of the pushing component is arranged on the driving rod in a penetrating mode, the mounting plate is fixed by fastening nuts arranged on the driving rod, and the number of the fastening nuts is two and the fastening nuts are respectively located on two sides of the mounting plate.
Based on the same inventive concept, the invention also relates to a test method of the oil level indicator, which adopts the oil level indicator test device and mainly comprises the following steps:
1) The sliding plate is positioned above the liquid level under the support of the elastic component, and the sealing tool is placed on the sliding plate;
2) Placing the oil level indicator on the sealing tool, the sliding plate still being above the liquid level;
3) The driving mechanism pushes the oil level indicator downwards under the condition of overcoming the supporting force of the elastic part, and the oil level indicator is in sealing connection with the sealing tool through the sealing ring, so that when the oil level indicator enters liquid, the liquid is ensured not to enter the inner cavity of the sealing tool;
4) The oil level indicator and the sealing tool are pushed by the driving mechanism to enter liquid together until the sealing tool is abutted against the base, and at the moment, the oil level indicator is completely immersed in the liquid;
5) The thrust of the driving mechanism maintains the sealing between the oil level indicator and the sealing tool, so that the inner cavity of the sealing tool is filled with compressed air with the pressure of more than or equal to 0.4MPa without leakage;
6) Filling compressed air with the pressure of more than or equal to 0.4MPa into the inner cavity of the sealing tool through an air source, and observing whether the oil level indicator bubbles or not to determine whether the sealing effect of the oil level indicator is good or not;
7) After the sealing test is completed, releasing compressed air in the sealing tool;
8) And the driving mechanism releases the thrust to the oil level indicator, and the sliding plate moves upwards to a position above the liquid level under the action of the elastic component, so that the experiment is finished.
Compared with the prior art, the invention has the characteristics of simple operation, low labor intensity, high test efficiency and the like; meanwhile, the problems that the existing test fixture and the oil level indicator screw thread are not fastened in place, so that test distortion is caused, and the tool internal screw thread is easy to damage or pollute the oil level indicator external screw thread can be avoided.
Drawings
FIG. 1 is a schematic diagram of a conventional oil level indicator test fixture;
FIG. 2 is a front view of the oil level indicator test apparatus of the present invention;
FIG. 3 is a schematic diagram of the connection of the seal tooling and the oil level indicator of the present invention;
fig. 4 is a side view of the oil level indicator test apparatus of the present invention.
In the figure: base 1, sliding plate 2, sealed frock 3, drum portion 31, trachea quick-operation joint 32, pushing component 4, mounting panel 41, guide pillar 5, fastening nut 6, pull rod 7, elastomeric element 8, adjusting nut 9, actuating mechanism 10, actuating lever 101, roof 11, basin 12, liquid 13, oil level indicator 14, sealing washer 15, trachea 16.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 2 to 4, the oil level indicator test apparatus of the present invention includes a water tank 12, a base 1, a guide post 5, a top plate 11, a slide plate 2, a sealing tool 3, a driving mechanism 10, and an elastic member 8.
The water tank 12 is provided with a liquid 13 for testing air tightness, and the liquid 13 is preferably clean water; the base 1 is positioned in the water tank 12; the lower end of the guide post 5 is fixedly connected with the base 1, a top plate 11 is fixedly arranged at the upper end of the guide post 5, and the number of the guide posts is more than or equal to 2, preferably 4; the sliding plate 2 is arranged on the guide post 5 in a penetrating way and can slide up and down along the guide post 5. Preferably, the guide post 5 adopts an upper section and a lower section, the diameter of the upper section is larger than that of the lower section, a shaft shoulder (an example of a limiting piece) is formed at the transition part of the upper section and the lower section, the shaft shoulder is used for limiting the upper limit position of the sliding plate sliding upwards, and the sliding plate 2 is positioned at the upper limit position before the test begins; it will be appreciated by those skilled in the art that other forms of limiting members may be provided on the guide post 5 in order to define the upper limit position of the slide plate, such as: stop nuts or stops protruding out of the surface of the guide post 5, etc.
Referring to fig. 3, the sealing tool 3 is placed on the sliding plate 2 and has a cylinder portion 31, the top end of the cylinder portion 31 is provided with a sealing ring 15 for connecting the cylinder portion 31 and the oil level indicator 14 to be tested, and the inner cavity of the cylinder portion 31 is communicated with an air source (not shown) for testing through an air pipe 16, and the air source can use an air compression pump or an air bottle or the like; in order to improve the convenience of connection, an air pipe quick connector 32 can be arranged on the sealing tool 3, one end of an air pipe 16 is detachably connected with the air pipe quick connector 32, and the other end of the air pipe is connected to an air source which is used for providing compressed air for a test; in order to keep the sealing tool 3 smoothly placed on the sliding plate 2, the sliding plate 2 may be provided with a structure for avoiding the air pipe quick connector 32 and/or the air pipe 16, for example: dodge holes or dodge slots. The top end of the cylindrical portion 31 is provided with an annular groove in which the seal ring 15 is disposed, and the top of the seal ring 15 protrudes from the groove so as to be able to abut against the oil level indicator 14, as shown in fig. 3, the seal ring 15 abuts against a stepped surface inside the oil level indicator 14 to seal. Alternatively, the seal ring 15 may be abutted against the lower end face of the oil level indicator 14 to seal the interior of the oil level indicator 14, and the seal ring 15 is pressed to achieve the sealing effect when the oil level indicator 14 and the sealing tool 3 are pressed.
The driving mechanism 10 is used for pushing the oil level indicator 14 to be tested downwards, the driving mechanism 10 is fixedly arranged on the top plate 11, the driving mechanism 10 can adopt an air cylinder or an electric push rod, a driving rod 101 of the driving mechanism is provided with a pushing component 4 for pushing the oil level indicator 14, as shown in fig. 2, the pushing component 4 is of a frame structure and is provided with a mounting plate 41, the mounting plate 41 is fixed on the driving rod 101 through two fastening nuts 6, the two fastening nuts 6 are respectively positioned on two sides of the mounting plate 41, the position of the pushing component 4 on the driving rod 101 can be adjusted by adjusting the two fastening nuts 6 so as to change the movement stroke of the pushing component 4, and the pushing component 4 is positioned above the oil level indicator 14 before the test starts.
The elastic component 8 provides upward supporting force for the sliding plate 2, and when the driving mechanism 10 does not push the oil level indicator 14 to be tested, the elastic component 8 supports the sliding plate 2, the sealing tool 3 and the oil level indicator 14 above the liquid level in the water tank.
In one embodiment, the elastic member 8 is an extension spring (not shown), the lower end of the extension spring is fixedly connected with the sliding plate 2, the upper end of the extension spring is fixedly connected with the top plate 11, the sliding plate 2 is located above the liquid surface in the initial state (when the driving mechanism 10 does not apply pushing force), and before the driving mechanism 10 pushes the sliding plate 2 into the liquid, the pulling force of the extension spring on the sliding plate 2 needs to ensure that the seal formed between the oil level indicator 14 and the sealing tool 3 can prevent the liquid from flowing into the inner cavity of the sealing tool 3.
In another embodiment, as shown in fig. 2 and 4, the oil level indicator test device further comprises a pull rod 7, wherein the bottom end of the pull rod 7 is fixedly connected with the sliding plate 2, and the pull rod 7 movably penetrates through the top plate 11; the elastic member 8 is a first compression spring that is fitted over the portion of the tie rod 7 located above the top plate 11, the lower end of the first compression spring is abutted against the upper surface of the top plate 11, the upper end of the first compression spring is abutted against an adjustment nut 9 provided on the tie rod 7, and the initial elastic force (when the driving mechanism 10 does not apply a pushing force) of the first compression spring can be adjusted by the adjustment nut 9. In the initial state (when the driving mechanism 10 does not apply pushing force), the first compression spring applies upward pushing force to the pull rod 7, the pull rod 7 pulls the slide plate 2 and positions the slide plate 2 at the upper limit position, and the lower the position of the adjusting nut 9, the larger the initial pulling force applied to the slide plate 2. When the driving mechanism 10 pushes the oil level indicator 14 downwards, the driving mechanism 10 overcomes the initial pulling force to push the oil level indicator 14 downwards, and the initial pulling force needs to ensure that when the driving mechanism 10 pushes the oil level indicator 14 downwards, the seal formed between the oil level indicator 14 and the sealing tool 3 can prevent liquid from flowing into the inner cavity of the sealing tool 3. The initial tension applied to the sliding plate 2 can be conveniently adjusted by adopting the pull rod 7 and the first compression spring, and the first compression spring is always positioned above the liquid level, so that the durability and the stability of the oil level indicator test device are maintained.
In another embodiment, the elastic component 8 is a second compression spring (not shown), the upper end of the second compression spring is abutted against the lower surface of the sliding plate 2, the lower end of the second compression spring is abutted against the base 1 or the water tank 13, the second compression spring can be sleeved on the guide post 5, in an initial state (when the driving mechanism 10 does not apply thrust), the sliding plate 2 is located above the liquid surface, and before the driving mechanism 10 pushes the sliding plate 2 into the liquid, the thrust of the second compression spring to the sliding plate 2 needs to ensure that the seal formed between the oil level indicator 14 and the sealing tool 3 can prevent the liquid from flowing into the inner cavity of the sealing tool 3. The elastic member 8 may be another elastic member, and is not limited to a spring.
The test method of the oil level indicator test device mainly comprises the following steps:
1. in the oil level indicator test device, as shown in fig. 2 in a natural state, the elastic part 8 transmits elastic force to the sliding plate 2 through the pull rod 7 by compressing the adjusting nut 9, so as to ensure that the sliding plate 2 is positioned above the liquid level (the position shown in the figure);
2. placing an oil level indicator 14 on the sealing tool 3;
3. the down switch of the driving mechanism 10 is turned on, and the driving mechanism 10 drives the pushing member 4 to move down to contact with the upper surface of the oil level indicator 14, so that downward pressure is transmitted to the oil level indicator 14. The sliding plate 2 transmits the upward elastic force provided by the elastic part 8 to the sealing tool 3 and the oil level indicator 14, so that a certain sealing effect is formed between the sealing tool 3 and the oil level indicator 14, and the sealing effect ensures that when the oil level indicator 14 enters liquid, the liquid does not enter the inner cavity of the sealing tool 3;
4. since the downward force of the cylinder is much greater than the elastic force of the elastic member 8, the driving mechanism 10 continues to move down until the slide plate 2 contacts the base 1, and the oil level indicator 14 is completely immersed in the liquid. The working pressure of the driving mechanism 10 acts on a sealing ring 15 between the oil level indicator 14 and the sealing tool 3, and the sealing pressure ensures that the sealing tool 3 is filled with 0.4MPa of compressed air without leakage;
5. opening a gas circuit switch of test compressed gas, filling the test compressed gas in the inner cavity of the sealing tool 3, and observing whether the oil level indicator 14 bubbles to determine whether the sealing effect of the product is good;
6. after the sealing test is completed, closing test compressed air, and releasing the compressed air in the inner cavity of the sealing tool 3;
7. turning on the up switch of the driving mechanism 10, the pushing member 4 moves upward, the sliding plate 2 also moves upward under the action of the elastic member 8, and finally stops at a position above the liquid level;
8. and (5) removing the oil level indicator 14 from the sealing tool 3 to complete the test.
The oil level indicator test device provided by the invention avoids threaded connection of the test tool and the oil level indicator, thereby preventing damage and pollution possibly caused by threaded connection. In addition, the existing test fixture is connected with the external thread of the oil level indicator, the compressed gas for testing is located at the inner side of the oil level indicator (the inner side faces to one side in the gear box when the oil level indicator is used), namely, the pressure direction of the compressed gas is from the inner side of the oil level indicator to the outer side, after the glass sheet in the oil level indicator is subjected to pressure, the sealing ring located at the outer side of the glass sheet is pressed, so that the sealing pressure of the glass sheet is increased, and a correct detection result is possibly not obtained. The compressed gas for testing the oil level indicator testing device is positioned on the outer side of the oil level indicator, so that the situation can be avoided, and the accuracy of test data is facilitated.
The embodiments of the present invention have been described above with reference to the accompanying drawings, and the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the invention and the scope of the appended claims, which are all within the scope of the invention.
Claims (7)
1. An oil level indicator test apparatus, comprising:
a water tank (12), wherein the water tank (12) is internally provided with a liquid (13);
a base (1), wherein the base (1) is positioned in the water tank (12);
the lower end of the guide post (5) is fixedly connected with the base (1), and a top plate (11) is fixedly arranged at the upper end of the guide post (5);
the sliding plate (2) can slide up and down along the guide post (5);
the sealing tool (3), the sealing tool (3) is arranged on the sliding plate (2) and is provided with a cylinder part (31), the top end of the cylinder part (31) is provided with a sealing ring (15) for connecting the cylinder part (31) and an oil level indicator (14) to be tested, and the inner cavity of the cylinder part (31) is communicated with an air source for the test; the top end of the cylinder part (31) is provided with an annular groove, the sealing ring (15) is arranged in the groove, and the top part of the sealing ring (15) protrudes out of the groove to be capable of being abutted against the oil level indicator (14);
a driving mechanism (10) for pushing the oil level indicator (14) to be tested downward, the driving mechanism (10) being fixedly arranged on the top plate (11); and
an elastic member (8) for providing upward supporting force to the sliding plate (2), the elastic member (8) supporting the sliding plate (2) above the liquid surface in the water tank (12) when the driving mechanism (10) does not push the oil level indicator (14) to be tested.
2. An oil level indicator test apparatus according to claim 1, further comprising a pull rod (7), wherein the bottom end of the pull rod (7) is fixedly connected to the sliding plate (2), and the pull rod (7) movably penetrates through the top plate (11); the elastic component (8) is the cover and is established pull rod (7) be located the first compression spring of top board (11) top, the lower extreme butt of first compression spring in the upper surface of top board (11), the upper end butt of first compression spring in set up in adjusting nut (9) on pull rod (7).
3. An oil level indicator test apparatus according to claim 1, wherein the elastic member (8) is an extension spring, the lower end of the extension spring is fixedly connected with the sliding plate (2), and the upper end of the extension spring is fixedly connected with the top plate (11).
4. An oil level indicator test apparatus according to claim 1, wherein the elastic member (8) is a second compression spring, an upper end of the second compression spring abuts against a lower surface of the sliding plate (2), and a lower end of the second compression spring abuts against the base (1) or the water tank (12).
5. An oil level indicator test apparatus according to any one of claims 1-4, characterized in that the guide post (5) is provided with a stop for limiting the upper limit position of the slide plate (2).
6. An oil level indicator test apparatus according to claim 1, characterized in that a driving rod (101) of the driving mechanism (10) is provided with a pushing member (4), a mounting plate (41) of the pushing member (4) is arranged on the driving rod (101) in a penetrating manner, the mounting plate (41) is fixed by fastening nuts (6) arranged on the driving rod, and the fastening nuts (6) are arranged in two and are respectively arranged on two sides of the mounting plate (41).
7. A method of testing an oil level indicator using the oil level indicator test apparatus as claimed in any one of claims 1 to 6, comprising the steps of:
1), the sliding plate (2) is positioned above the liquid level under the support of the elastic component (8), and the sealing tool (3) is placed on the sliding plate (2);
2) Placing an oil level indicator (14) on the sealing tool (3), wherein the sliding plate (2) is still positioned above the liquid level;
3) The driving mechanism (10) pushes the oil level indicator (14) downwards under the condition of overcoming the supporting force of the elastic part (8), and the oil level indicator (14) and the sealing tool (3) are in sealing connection through the sealing ring (15), so that when the oil level indicator (14) enters liquid, the liquid is ensured not to enter the inner cavity of the sealing tool (3);
4) The oil level indicator (14) and the sealing tool (3) are pushed by the driving mechanism (10) to enter liquid (13) together until the sealing tool (3) is abutted against the base (1), and at the moment, the oil level indicator (14) is completely immersed in the liquid (13);
5) The thrust of the driving mechanism (10) maintains the sealing between the oil level indicator (14) and the sealing tool (3), so that the inner cavity of the sealing tool (3) is filled with compressed air with the pressure of more than or equal to 0.4MPa without leakage;
6) Filling compressed air with the pressure of more than or equal to 0.4MPa into the inner cavity of the sealing tool (3) through an air source, and observing whether the oil level indicator (14) bubbles or not to determine whether the sealing effect of the oil level indicator (14) is good or not;
7) After the sealing test is finished, releasing compressed air in the sealing tool (3);
8) And the driving mechanism (10) releases the thrust to the oil level indicator (14), and the sliding plate (2) moves upwards to a position above the liquid level under the action of the elastic component, so that the experiment is finished.
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| CN201811120338.5A CN109186707B (en) | 2018-09-26 | 2018-09-26 | Oil level indicator test device and test method thereof |
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| CN201811120338.5A CN109186707B (en) | 2018-09-26 | 2018-09-26 | Oil level indicator test device and test method thereof |
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| CN109186707A CN109186707A (en) | 2019-01-11 |
| CN109186707B true CN109186707B (en) | 2024-04-09 |
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| J.B. Stocking ; W.C. Eberhardt ; Y.A. Shakhsheer ; B.H. Calhoun ; J.R. Paulus ; M. Appleby.A capacitance-based whisker-like artificial sensor for fluid motion sensing.《SENSORS，2010 IEEE》.2010, * |
| 行程套管和密封壳超声水浸检测系统研究;周志威;《中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑)》;B015-32 * |
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