CN110487330A - A kind of sensor detachable watertight protection cover - Google Patents
A kind of sensor detachable watertight protection cover Download PDFInfo
- Publication number
- CN110487330A CN110487330A CN201910781234.7A CN201910781234A CN110487330A CN 110487330 A CN110487330 A CN 110487330A CN 201910781234 A CN201910781234 A CN 201910781234A CN 110487330 A CN110487330 A CN 110487330A
- Authority
- CN
- China
- Prior art keywords
- sensor
- plate portion
- ceiling plate
- protection cover
- watertight protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/26—Windows; Cover glasses; Sealings therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Gasket Seals (AREA)
Abstract
The present invention relates to ship sensor technical field of sealing technology more particularly to a kind of sensor detachable watertight protection covers.Including covering on annular seal and ceiling plate portion on the outside of sensor, one side seal of the annular seal is fixed on cabin outer wall, the removable other side for being sealingly mounted at annular seal of the ceiling plate portion, the conducting wire being provided in the ceiling plate portion for sensor seals the stuffing box structure being pierced by, the stuffing box structure includes extrusion and covers elastic seal ring in conducting wire peripheral side, and the extrusion is for squeezing elastic seal ring, so that in sealing contact between elastic seal ring and the conducting wire.By using watertight protection cover of the invention, the problem of avoiding waterlogged damage in sensor, the service life of sensor is extended.In addition, watertight protection cover of the invention disassembles and installs conveniently, by the way that ceiling plate portion to be removed to the maintenance and replacement that can be realized to sensor, the routine work of staff is facilitated.
Description
Technical field
The present invention relates to ship sensor technical field of sealing technology more particularly to a kind of sensor detachable watertight protection covers.
Background technique
Many cabins are usually provided in existing ship, these cabins can be divided into crew's cabin, operating cabin and battalion
Industry cabin, in order to guarantee the safe navigation of ship, staff needs the case where understanding each cabin in real time, so the prior art
In each cabin side wall on be usually mounted with corresponding sensor, such as it is easy in fuel oil tank, lubricating oil tank, dregs of fat cabin, waste oil cabin etc.
It fires in explosive cabin, is usually mounted with temperature sensor and the sensor for monitoring liquid level.
Currently, above-mentioned marine sensor is mostly mounted on compartment roof or cabin side wall by the way of being screwed.
When fixed sensor, needs that first a welding base is welded on the siding of cabin, sensor threads are then connected to welding base
Upper, due to using being screwed by the way of, the probe segment of sensor is positioned at cabin interior after fixation, and sensor
One end for connecting wire is then located on the outside of cabin, and the exposed Sensor section on the outside of cabin is easy by seawater immersion, into
And it be easy to cause the damage of sensor.
Summary of the invention
The present invention provides a kind of sensor detachable watertight protection covers, for solving the biography of ship's space in the prior art
Sensor is easy by seawater immersion, thus the technical issues of being easily damaged.
Sensor of the invention detachable watertight protection cover adopts the following technical scheme that:
A kind of sensor detachable watertight protection cover includes the annular seal and ceiling plate portion covered on the outside of sensor, described
One side seal of annular seal is fixed on cabin outer wall, and the ceiling plate portion is removable to be sealingly mounted at the another of annular seal
Side, the conducting wire being provided in the ceiling plate portion for sensor seal the stuffing box structure being pierced by, and the stuffing box structure includes squeezing
Casting die and elastic seal ring in conducting wire peripheral side is covered, the extrusion is for squeezing elastic seal ring, so that elastic packing
It is in sealing contact between circle and the conducting wire.
The utility model has the advantages that the part that sensor leaks out cabin outer wall is housed in water by using watertight protection cover of the invention
The inside of privacy protection cover, sensor and seawater can be isolated for watertight protection cover, thus the case where avoiding sensor from being submerged, into
And the problem of avoiding waterlogged damage in sensor, extend the service life of sensor.In addition, watertight protection cover of the invention
Disassembly and installation is convenient, by the way that ceiling plate portion to be removed to the maintenance and replacement that can be realized to sensor, facilitates staff's
Routine work.
Further, the first washer is provided between the elastic seal ring and extrusion.The beneficial effect is that: the first pad
Circle is capable of increasing the forced area of elastic seal ring, and it is smaller and elastic seal ring is caused to become to avoid elastic seal ring forced area
Shape unshapeliness, and then lead to the problem of excellent sealing is unable between elastic seal ring and conducting wire.
Further, elastic seal ring is provided with second packing ring away from the other side of the first washer.The beneficial effect is that: make
Elastic seal ring two sides can uniform stressed, ensure that the deformation effect of elastic seal ring.
Further, the stuffing box structure includes the firm banking that sealing is fixed in ceiling plate portion, the firm banking
On be provided with fixation hole for elastic seal ring and extrusion insertion, be provided in the fixation hole or in ceiling plate portion for stopping
The stopping surface of elastic seal ring.The beneficial effect is that: the installation for facilitating elastic seal ring and extrusion is fixed.
Further, it is provided with the perforation passed through for conducting wire in the ceiling plate portion, the fixing seat includes major diameter section and small
Diameter section, the path section is for being inserted into the perforation.The beneficial effect is that: it on the one hand facilitates and fixing seat position is determined
Position, by the way that the determination of position will can be realized in path section insertion perforation；On the other hand the close of fixing seat and ceiling plate portion is enhanced
Sealing property.
Further, the extrusion Screw assembly is in the fixation hole.The beneficial effect is that: it on the one hand facilitates crowded
The installing and dismounting of casting die；On the other hand make extrusion adjustable to the extruding force of elastic seal ring, thus realize to conducting wire and
The adjustable of contact is squeezed between elastic seal ring.
Further, the protrusion for increasing extrusion diameter is provided on the outer peripheral surface of the extrusion.Its is beneficial
Effect is: on the one hand the setting of protrusion increases the torque of extrusion, thus facilitate rotary squeezing part, another aspect protrusion
It can be with the hole of fixation hole along mutual block, so as to avoid extrusion from screwing in fixation hole.
Further, the ceiling plate portion is connected through a screw thread part and is fixed in annular seal, is arranged in the ceiling plate portion
There is the first connecting flange, the second connecting flange is provided in the annular seal.The beneficial effect is that: facilitate ceiling plate portion and
The installation of annular seal is fixed, and ensure that good leakproofness.
Further, elastic sealing gasket is installed between the ceiling plate portion and annular seal.The beneficial effect is that: it improves
Sealing performance avoids water and passes through gap and penetrates into annular seal.
Further, the stuffing box structure and sensor are respectively positioned on the central axes of watertight protection cover.Its advantages
It is: the case where on the one hand making the conducting wire between sensor and stuffing box structure most short, avoiding conducting wire oblique pull；On the other hand make
The surrounding spacing for obtaining sensor and annular seal is consistent.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the embodiment 1 of sensor of the invention detachable watertight protection cover；
Fig. 2 is the schematic top plan view of Fig. 1；
Fig. 3 is schematic cross-section at A-A in Fig. 2；
Fig. 4 is the half section signal of the stuffing box structure of the embodiment 1 of sensor of the invention detachable watertight protection cover
Figure；
Fig. 5 is the schematic cross-sectional view of fixing seat in Fig. 4；
Fig. 6 is the half section schematic diagram of extrusion in Fig. 4.
The reference numerals are as follows:
1- cabin outer wall, 2- annular seal, the second connecting flange of 201-, 3- ceiling plate portion, 4- stuffing box structure, 401- are squeezed
Casting die, 4011- protrusion, the first washer of 402-, 403- elastic seal ring, 404- second packing ring, 405- fixing seat, 4051- are big
Diameter section, 4052- stopping surface, 4053- path section, 5- sensor, 6- elastic sealing gasket, 7- threaded connector.
Specific embodiment
To better illustrate the object, technical solutions and advantages of the present invention, with reference to the accompanying drawings and examples to the present invention
Specific embodiment be described in further detail.The following examples are intended to illustrate the invention, but is not limited to of the invention
Range.
The embodiment 1 of sensor of the invention detachable watertight protection cover (hereinafter referred to as watertight protection cover):
As shown in Figures 1 to 6, watertight protection cover includes the annular seal 2 and ceiling plate portion 3 for covering on 5 outside of sensor, institute
The side seal for stating annular seal 2 is fixed on cabin outer wall 1, and the ceiling plate portion 3 is removable to be sealingly mounted at annular seal 2
The other side, the conducting wire being provided in the ceiling plate portion 3 for sensor 5 seals the stuffing box structure 4 being pierced by, the stuffing-box knot
Structure 4 includes extrusion 401 and covers elastic seal ring 403 in conducting wire peripheral side, and the extrusion 401 is close for squeezing elasticity
Seal 403, so that in sealing contact between elastic seal ring 403 and the conducting wire.
Specifically, watertight protection cover includes annular seal 2 in the present embodiment, annular seal 2 is circle ring column, ring
The bottom of shape sealing 2 is weldingly fixed on cabin outer wall 1.The material of annular seal 2 is steel pipe in the present embodiment, in addition,
In conjunction with the relative dimensions of existing temperature sensor 5, liquid level sensor 5, in the present embodiment, the diameter of bore of annular seal 2 is not
Less than 250mm, specifically, the diameter of bore of annular seal 2 is 300mm in the present embodiment, it is annular close in other embodiments
The diameter of bore in envelope portion 2 can be 250mm, 350mm, 400mm, 500mm etc..
The removable top for being sealingly mounted at annular seal 2 in the present embodiment cover plate portion 3, ceiling plate portion 3 are one block of round steel
Plate, ceiling plate portion 3 are connected through a screw thread part 7 and are fixed in annular seal 2, and the first connecting flange is provided in ceiling plate portion 3, annular
The second connecting flange 201 is provided on sealing 2.The first connecting flange is integrally disposed upon the periphery of ceiling plate portion 3 in the present embodiment
Side is circumferentially equidistantly provided with multiple through-holes in ceiling plate portion 3, is provided with 3 circumferential section of ceiling plate portion of through-hole
It is considered as the first connecting flange.The second connecting flange 201 is annular shape in the present embodiment, and the second connecting flange 201 is weldingly fixed on
The peripheral side of annular seal 2 is circumferentially also arranged at intervals with multiple through-holes on second connecting flange 201.This implementation
In example, threaded connector 7 includes bolt, gasket and nut, and multiple bolts are inserted into when installation the first connecting flange and the simultaneously
In through-hole on two connecting flanges 201, nut is then tightened.The case where in order to avoid seeping water at gap, in the present embodiment
It is clamped with elastic sealing gasket 6 between ceiling plate portion 3 and annular seal 2, elastic sealing gasket 6 is circular rubber pad, and first
Rubber pad can be pressed on centre by connecting flange and the second connecting flange 201, thus realize ceiling plate portion 3 and annular seal 2 it
Between sealing.
Due to concatenate conducting wire on sensor 5, in order to enable conducting wire can be pierced by out of watertight protection cover, in the present embodiment
Stuffing box structure 4 is installed in ceiling plate portion 3, stuffing box structure 4 includes fixing seat 405, the first washer 402, elastic seal ring
403, second packing ring 404 and extrusion 401.Fixing seat 405 is ladder tubulose in the present embodiment, as shown in figure 5, fixing seat
405 include the major diameter section 4051 and the lesser path section 4053 of diameter being relatively large in diameter, and is provided in ceiling plate portion 3 and is pierced by for conducting wire
Perforation, the diameter of the present embodiment small-and-middle diameter section 4053 is slightly less than the diameter of perforation, and the diameter of major diameter section 4051 is slightly larger than perforation
Diameter.Fixing seat 405 is weldingly fixed in ceiling plate portion 3 in the present embodiment, when welding, in the insertion perforation of path section 4053, greatly
The end of diameter section 4051 and the hole of perforation are specific as shown in Figure 3 along mutual block.It is provided in fixing seat 405 in the present embodiment
For the fixation hole of the first washer 402, second packing ring 404, elastic seal ring 403 and extrusion 401 insertion, fixation hole is ladder
The fixed hole diameter in hole, i.e. 405 major diameter section 4051 of fixing seat is greater than the fixed hole diameter of path section 4053.In the present embodiment
Two washers 404, elastic seal ring 403, the first washer 402, extrusion 401 are installed in fixation hole corresponding to major diameter section 4051
In, second packing ring 404, elastic seal ring 403, the first washer 402, extrusion 401 are set gradually from Inside To Outside.This implementation
The first washer 402 and second packing ring 404 are common annular gasket in example；Elastic seal ring 403 is one piece of annulus column
Rubber block, rubber block is internally provided with the through-hole passed through for conducting wire；Extrusion 401 is internally provided with through-hole similar to one
Bolt, the peripheral side of extrusion 401 are provided with external screw thread, are provided with internal screw thread in the fixation hole of 405 major diameter section 4051 of fixing seat,
401 Screw assembly of extrusion is in fixation hole.
The diameter of second packing ring 404 is greater than fixed hole diameter corresponding to path section 4053 in the present embodiment, when installation, the
Two washers 404 can be by block at the interior cascaded surface between major diameter section 4051 and path section 4053, which constitutes this
The stopping surface 4052 of embodiment, it is specific as shown in Figure 5.The peripheral side of extrusion 401 is provided with protrusion 4011 in the present embodiment,
The whole similar bolt head of protrusion 4011, it is specific as shown in Figure 6.The material of extrusion 401 is brass in the present embodiment.
Welding base is welded on the external wall 1 of the present embodiment middle deck, and (welding base is the installation with threaded interior hole
Seat), sensor 5 can be threadedly secured on welding base by the threaded interior hole of welding base, 4 He of stuffing box structure in the present embodiment
Welding base is respectively positioned on the central axes of watertight protection cover, specifically, ceiling plate portion 3 is arranged in stuffing box structure 4 in the present embodiment
The center of annular seal 2 is arranged in center location, welding base.
The watertight protection of the present embodiment covers in use, ring packing cover is located immediately at the peripheral side of welding base, peace
Sensor 5 is threadedly secured on welding base first when dress, the probe of sensor 5 can be inserted into cabin, and sensor 5 is for connecting
The part for connecing conducting wire can be located on the outside of cabin.Then second packing ring 404, elastic seal ring 403, the first washer 402 are successively put
Enter in fixation hole, extrusion 401 is then screwed at the port of fixation hole (so that extrusion 401 is capable of fixing in fixation hole
, do not need excessively to screw in).Then by the conducting wire of sensor 5 from fixation hole, the through-hole of second packing ring 404, elastic seal ring
403 through-hole, the through-hole of the first washer 402, the through-hole in extrusion 401 are pierced by.Then part 7 is connected through a screw thread by ceiling plate portion
3 are fixed in annular seal 2, need for elastic sealing gasket 6 to be placed between ceiling plate portion 3 and annular seal 2 before fixed.When
After ceiling plate portion 3 and annular seal 2 are fixed, conducting wire (also can choose and do not pull) is pulled, slightly to guarantee in watertight protection cover
Conducting wire do not bend.Finally extrusion 401 is screwed into fixation hole, extrusion 401, which can squeeze elastic seal ring 403, to be become
The elastic seal ring 403 of shape, deformation can be in sealing contact with conducting wire, to realize the sealing for being pierced by position to conducting wire, avoids
Seawater penetrates into from gap.
The embodiment 2 of watertight protection cover of the invention, is with the distinguishing feature of embodiment 1: ceiling plate portion be it is box-like,
The surrounding of ceiling plate portion is provided with a ring shape flange, and when ceiling plate portion is fixed in annular seal, annular flange can parcel
The second connecting flange divided, to further improve the leakproofness of ceiling plate portion and annular seal gap location.
The embodiment 3 of watertight protection cover of the invention, is with the distinguishing feature of embodiment 1: fixing seat is cylinder
Shape, i.e. fixing seat can be considered not include path section, and the fixed hole diameter of fixing seat is greater than the diameter perforated in ceiling plate portion, fixed
Seat is directly weldingly fixed in ceiling plate portion, and second packing ring is then directly contacted with ceiling plate portion, the area perforation Kong Yan of fixation hole corral
Domain constitutes the stopping surface of the present embodiment.
In other embodiments: annular seal is removable by way of Screw assembly to be fixed on cabin outer wall.Annular
Sealing is prism-shaped, hemispherical etc..
Above embodiments essentially describe the basic principles, principal features and advantages of the present invention.The technical staff of the industry
It should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variation and
Improvement all fall within the protetion scope of the claimed invention.
Claims (10)
1. a kind of sensor detachable watertight protection cover, it is characterised in that: including covering on the annular seal on the outside of sensor (5)
(2) it is fixed on cabin outer wall (1) with ceiling plate portion (3), a side seal of the annular seal (2), the ceiling plate portion (3) can
It tears the other side for being sealingly mounted at annular seal (2) open, the conducting wire sealing for sensor (5) is provided on the ceiling plate portion (3)
The stuffing box structure (4) being pierced by, the stuffing box structure (4) include extrusion (401) and cover elasticity in conducting wire peripheral side
Sealing ring (403), the extrusion (401) for squeezing elastic seal ring (403), so that elastic seal ring (403) and described
It is in sealing contact between conducting wire.
2. sensor detachable watertight protection cover according to claim 1, it is characterised in that: the elastic seal ring
(403) it is provided between extrusion (401) the first washer (402).
3. sensor detachable watertight protection cover according to claim 2, it is characterised in that: elastic seal ring (403) back
The other side from the first washer (402) is provided with second packing ring (404).
4. sensor detachable watertight protection cover according to claim 1, it is characterised in that: the stuffing box structure (4)
Including sealing the firm banking being fixed on ceiling plate portion (3), it is provided on the firm banking for elastic seal ring (403) and is squeezed
The fixation hole of casting die (401) insertion is provided in the fixation hole or in ceiling plate portion (3) for stopping elastic seal ring (403)
Stopping surface (4052).
5. sensor detachable watertight protection cover according to claim 4, it is characterised in that: set on the ceiling plate portion (3)
It is equipped with the perforation passed through for conducting wire, the fixing seat (405) includes major diameter section (4051) and path section (4053), the path section
(4053) for being inserted into the perforation.
6. sensor detachable watertight protection cover according to claim 4, it is characterised in that: extrusion (401) spiral shell
Line is assemblied in the fixation hole.
7. sensor detachable watertight protection cover according to claim 6, it is characterised in that: the extrusion (401)
The protrusion (4011) for increasing extrusion (401) diameter is provided on outer peripheral surface.
8. sensor detachable watertight protection cover according to claim 1, it is characterised in that: the ceiling plate portion (3) passes through
Threaded connector (7) is fixed on annular seal (2), is provided with the first connecting flange, the annular on the ceiling plate portion (3)
The second connecting flange (201) are provided on sealing (2).
9. sensor detachable watertight protection cover according to claim 8, it is characterised in that: the ceiling plate portion (3) and ring
Elastic sealing gasket (6) are installed between shape sealing (2).
10. sensor detachable watertight protection cover described according to claim 1~any one of 9, it is characterised in that: described
Stuffing box structure (4) and sensor (5) are respectively positioned on the central axes of watertight protection cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910781234.7A CN110487330A (en) | 2019-08-22 | 2019-08-22 | A kind of sensor detachable watertight protection cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910781234.7A CN110487330A (en) | 2019-08-22 | 2019-08-22 | A kind of sensor detachable watertight protection cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110487330A true CN110487330A (en) | 2019-11-22 |
Family
ID=68553061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910781234.7A Pending CN110487330A (en) | 2019-08-22 | 2019-08-22 | A kind of sensor detachable watertight protection cover |
Country Status (1)
| Country | Link |
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| CN (1) | CN110487330A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098483A (en) * | 2020-09-11 | 2020-12-18 | 中山大学 | Watertight reference electrode |
| CN113776570A (en) * | 2021-11-15 | 2021-12-10 | 山东鱼台东源矿用设备有限责任公司 | Protection device for mining machinery sensor |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098483A (en) * | 2020-09-11 | 2020-12-18 | 中山大学 | Watertight reference electrode |
| CN112098483B (en) * | 2020-09-11 | 2022-02-18 | 中山大学 | Watertight reference electrode |
| CN113776570A (en) * | 2021-11-15 | 2021-12-10 | 山东鱼台东源矿用设备有限责任公司 | Protection device for mining machinery sensor |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191122 |