CN210952871U - Optical fiber sensing device based on hydraulic linkage - Google Patents
Optical fiber sensing device based on hydraulic linkage Download PDFInfo
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- CN210952871U CN210952871U CN201922294037.0U CN201922294037U CN210952871U CN 210952871 U CN210952871 U CN 210952871U CN 201922294037 U CN201922294037 U CN 201922294037U CN 210952871 U CN210952871 U CN 210952871U
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Abstract
The utility model discloses an optic fibre sensing device based on hydraulic pressure linkage, include: the device comprises a driving cylinder body, a driving piston, a transmission connecting rod, a compression spring, a guide pipe, a driven cylinder body, a driven piston and an optical fiber hook; a driving piston is sleeved with a driving cylinder body, a transmission connecting rod penetrates through an upper cover of the driving cylinder body to be connected with the driving piston, a compression spring is sleeved on the part of the transmission connecting rod exposed outside the driving cylinder body, one end of the compression spring is connected with the upper cover of the driving cylinder body, one end of the compression spring is connected with one end, away from the driving piston, of the transmission connecting rod outside the driving cylinder body, the driving cylinder body is connected with a driven cylinder body through a guide pipe, the driven piston is sleeved with the driven cylinder body, and the lower part of the driven piston is connected with an optical. The utility model discloses directly utilize the idle fibre core in these optic fibre or the optical cable to realize the sensing, need not lay the optic fibre or the optical cable that are used for optic fibre sensing again, improved the adaptability of device, also reduced the installation and construction technique degree of difficulty, have good adaptability in abominable underground tunnel environment.
Description
Technical Field
The utility model belongs to the technical field of cable tunnel inspection shaft safety precaution, more specifically relates to an optical fiber sensing device based on hydraulic pressure linkage.
Background
The cable tunnel inspection well cover is an openable closure of a cable tunnel (ditch) inspection well head. In order to facilitate opening, the pressure-sensitive adhesive is usually pressed directly on a well seat of an inspection well head. However, the manhole cover is stolen and the manhole cover is flushed by running water caused by heavy rain, and particularly when the manhole cover is waterlogged, the manhole mouth which is not pressed by the manhole cover brings huge potential safety hazards to pedestrians and vehicles on the road. Traditional well lid alarm is mostly electronic alarm, and it sends alarm signal through mobile network. When the electronic alarm is far away from the mobile communication base station or the alarm is blocked due to signals, the communication module of the alarm frequently sends a connection request to the base station. These connection requests have higher transmitting power, and can sharply consume the electric quantity of a built-in battery of the alarm, and reduce the endurance time of the alarm.
The optical fiber sensing is used as a novel passive sensing technology, does not depend on the electric quantity of a battery, has long sensing distance and low laying cost, can also directly use the fiber core resource of the existing communication optical cable, and is an important means for long-distance safety precaution. The Chinese patent with publication number CN104950343A discloses a well lid monitoring system and method based on optical fiber sensing, wherein a detection optical fiber comprises a plurality of optical fibers, an optical fiber with preset length is fixed below each well lid, each optical fiber simultaneously monitors a plurality of well lids, and the plurality of optical fibers enable the plurality of well lids to form a well lid monitoring network; obviously, the scheme needs to re-lay the optical fiber with the preset length, and the long-distance detection brings huge construction cost of underground optical fiber laying and underground optical fiber fusion.
Chinese patent publication No. CN106772662A discloses a monitoring device for a cable tv optical fiber network buried well lid, which comprises a far-end probe, a local-end device, and a cable tv optical fiber network, wherein a round hole of a rod body in the "far-end probe" substantially acts on the size of an optical channel between a right-end tail fiber and a left-end tail fiber when a movable rod moves downwards and upwards, and is an optical switch consisting of the optical fiber and the movable rod. Thereby realizing the sensing of whether the well lid is pressed or not. The utility model discloses a notice number is CN204087406U china utility model patent discloses an alarm device is opened to response optic fibre formula well lid includes that this circle of shape trigger device of at least one circle shape trigger device includes the colloid, protection sheet steel and response optic fibre, and response optic fibre sets up between two colloids to realize the sensing whether optic fibre is to the well lid pressfitting. The two technical schemes both have to rely on leading the electric power communication optical fiber to the vicinity of the well cover on the premise of not laying the sensing optical fiber or the optical cable again. However, due to the lack of standardization in early construction or the need for expansion of the power system, most of the power communication optical fibers buried in the power cable trench (tunnel) are compressed or mixed in dozens of power cable bundles. On one hand, the electric power communication optical cables mixed in the electric power cable bundles are difficult to sort out, and on the other hand, the limited reserved redundant length is difficult to directly hang the electric power communication optical cables on a well cover needing to be monitored. Therefore, it is difficult to monitor the change of the cable trench manhole cover by directly using the polarization state change vibration sensing technology of the optical signal in the power communication optical cable.
The utility model discloses a notice number is CN203838833U chinese utility model patent discloses an alarm device is prevented invading by city pipe network based on optical fiber sensing, its "vibration trigger device including set up the well lid couple in the well lid bottom, with well lid couple matched with pull couple, cover establish the reset spring at survey optic fibre surface, pull the couple and be connected with reset spring through tensile silk thread, reset spring passes through set screw and installs on the wall of a well. Although the technical scheme can reflect the pressing change of the well cover on the sensing optical signal in the optical fiber at a long distance, the technical scheme uses the stretched silk thread which is not protected by any shell and is directly arranged between the well wall and the well cover, and when water flow impact, small animals pass through and garbage sludge disturbance occurs, the silk thread is easy to be disturbed, so that the optical fiber sensing signal is changed and false alarm is caused.
Disclosure of Invention
To the above defect or the improvement demand of prior art, the utility model provides an optic fibre sensing device based on hydraulic pressure linkage, its aim at utilizes idle fibre core resource in the current power communication optical cable to realize the application of optic fibre sensing system as sensing medium, solves down the pit optic fibre and lays and arouse the alert problem of wrong report easily with other technical scheme with the fusion splice construction cost height of optic fibre in the pit from this.
In order to achieve the above object, according to an aspect of the present invention, there is provided an optical fiber sensing device based on hydraulic linkage, including: the device comprises a driving cylinder body 1, a driving piston 2, a transmission connecting rod 3, a compression spring 4, a guide pipe 5, a driven cylinder body 6, a driven piston 7 and an optical fiber hook 8; the driving piston 2 is sleeved with the driving cylinder body 1, the transmission connecting rod 3 penetrates through the upper cover of the driving cylinder body 1 to be connected with the driving piston 2, the compression spring 4 is sleeved on the part, exposed outside the driving cylinder body 1, of the transmission connecting rod 3, one end of the compression spring 4 is connected with the upper cover of the driving cylinder body 1, one end of the compression spring 4 is connected with one end, far away from the driving piston 2, of the transmission connecting rod 3 outside the driving cylinder body 1, the driving cylinder body 1 is connected with the driven cylinder body 6 through the guide pipe 5, the driven piston 7 is sleeved with the driven cylinder body 6, and the lower portion of the driven piston 7 is. When the well lid lifts up, the transmission connecting rod 3 is upwards pulled by the recovery of the deformation of the compression spring 4, the pressure in the driving cylinder body 1 and the driven cylinder body 6 is reduced, and the driven piston 7 moves upwards to pull the electric power communication optical fiber hung on the optical fiber hook 8.
Preferably, transmission connecting rod 3 is hollow structure for reduce transmission connecting rod 3's weight, be favorable to reducing the influence that receives transmission connecting rod 3 gravity when compression spring 4 recovers from the compression state after the well lid is putd aside.
Preferably, the transmission connecting rod 3 is specifically a two-section rotary telescopic structure for adjusting the length of the transmission connecting rod 3 to adapt to different installation distances between the driving cylinder body 1 below the well lid and the well lid.
Preferably, the conduit 5 is embodied as a metal conduit,
preferably, the metal conduit is a copper metal conduit, which has certain rigidity but also has flexibility, so that the connection between the driving cylinder 1 and the driven cylinder 6 is facilitated, and the change of the liquid pressure in the driving cylinder 6 and the driven cylinder 6 caused by the water flow and sludge squeezing pipelines can be reduced.
Preferably, the transmission link 3 is made of a non-metallic material. The heat conduction performance of the transmission connecting rod 3 is reduced by adopting the non-metallic material, so that the transmission connecting rod 3 is favorable for preventing heat of a metal well cover on the ground surface from being transmitted to transmission liquid in summer, and the volume of the transmission liquid is expanded at high temperature; reducing the thermal conductivity of drive link 3 also helps preventing that drive link 3 from conducting the heat of transmission liquid to the well lid in winter, causes the transmission liquid to solidify at low temperature.
Preferably, the transmission connecting rod 3 is made of engineering plastics.
The metal conduit is externally provided with a coating layer for heat preservation and heat insulation;
the transmission liquid filled in the driving cylinder body 1, the driven cylinder body 6 and the metal conduit is specifically low-temperature hydraulic oil with the thermal conductivity coefficient lower than 0.14W/(m.K) and the condensation temperature lower than minus 30 ℃, and the low-temperature hydraulic oil mainly comprises the following components: the system comprises aviation hydraulic oil, low-freezing-point anti-wear hydraulic oil and multi-stage hydraulic oil, wherein the aviation hydraulic oil has lower viscosity and better fluidity at low temperature, so the aviation hydraulic oil is preferred in the system.
Preferably, the part without transmission liquid at the lower part of the driven cylinder body 6 is a hollow disturbance cavity, and the disturbance cavity is a hollow cavity formed by extending the side wall of the driven cylinder body 6 downwards, so that the side wall of the driven cylinder body 6 is also used for preventing the optical fiber hung on the optical fiber hook 8 from being impacted by flowing water, garbage and sludge to generate false alarm, and the false alarm and the alarm failure are avoided. In the disturbance cavity, the driven piston 7 drives the optical fiber hook 8 to move through the reciprocating motion of the piston, so that the optical fiber hung on the optical fiber hook 8 is deformed, and the disturbance to the optical fiber is generated. An opening for inserting an optical fiber or an optical cable is arranged at the lower part of the side wall of the driven cylinder body 6; the bottom of the driven cylinder body 6 is provided with a detachable bottom cover which is used for hanging and installing optical fiber cables after the bottom cover is opened. After the installation is finished, the bottom cover is closed, and flowing water, silt and garbage are prevented from flowing into the bottom of the driven cylinder body 6 to impact and disturb the optical fibers and the connecting structural members in the cavity.
Preferably, the optical fiber hook 8 is provided with a spring catch to prevent the optical fiber or the optical cable from slipping off the hook when the driven piston 7 falls down.
Preferably, a rotating mechanism capable of rotating horizontally and locking the rotating angle is further included between the driven piston 7 and the fiber hook 8. The rotation angle of the lock is specifically 0 to 180 degrees, and the rotation angle of the lock is preferably two angles of 0 and 180 degrees. After the optical fiber or the optical cable is hung, the optical cable hanging point can be rotated by about 180 degrees through the knob, so that the optical fiber or the optical cable is staggered below the hanging point, the deformation of the optical fiber or the optical cable generated by pulling the optical fiber or the optical cable when the driven piston 7 moves upwards is increased, and the optical fiber or the optical cable can be hung and staggered quickly underground.
Preferably, a height adjusting device is arranged above or below the rotating mechanism and used for finely adjusting the height of the optical fiber hook 8.
Preferably, the height adjusting device is formed by sleeving a screw rod and a nut between the optical fiber hook 8 and the driven piston 7 in series. The distance between the fiber hook 8 and the slave piston 7 can be adjusted by rotating the screw.
Preferably, a vibration starting spring is connected between the upper part of the optical fiber hook 8 and the driven piston 7 in series. In the polarization state optical fiber sensing, short polarization state change signals are easily mixed in noise and are not easy to identify, and the time length of the optical fiber subjected to disturbance is prolonged through a spring. When the optical fiber hook 8 moves upwards along with the driven piston 7, the vibration starting spring prolongs the time length of the optical fiber disturbed by the reciprocating motion after sudden pulling.
Generally, through the utility model discloses above technical scheme who thinks compares with prior art, because the utility model discloses an optic fibre couple 8 directly articulates the optic fibre or the optical cable that are used for power communication who has already laid in cable tunnel, directly utilizes idle fibre core in these optic fibre or the optical cable to realize the sensing, need not lay optic fibre or the optical cable that is used for optic fibre sensing again.
Secondly, because the utility model discloses a components of a whole that can function independently design that pipe 5 is connected for initiative cylinder body 1 and driven cylinder body 6 are kept away from, and divide and arrange well lid and tunnel in, need not pull out and articulate near well lid or well lid with the optic fibre or the optical cable that are used for electric power communication that have already laid, have improved the adaptability of device, have also reduced the installation and construction technique degree of difficulty.
Thirdly, the utility model discloses a certain rigid pipe 5 comes the liquid flow and the pressure of conduction in initiative piston 2 and the slave piston 7, and pipe 5 does not receive the disturbance influence of flowing water, toy, rubbish, silt and changes liquid flow and pressure change, and the disturbance of flowing water, toy, rubbish, silt can not arouse the wrong report police, so has good adaptability in abominable underground tunnel environment.
Drawings
FIG. 1 is a schematic diagram of a hydraulic linkage-based optical fiber sensing device;
FIG. 2 is a schematic diagram of the internal structure of a slave cylinder of a fiber optic sensing device based on hydraulic linkage;
fig. 3 is a schematic diagram of a spring-lock structure of an optical fiber hook of an optical fiber sensing device based on hydraulic linkage.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The specific structure of the fiber sensor device based on hydraulic linkage according to the present invention is described below with reference to fig. 1, which comprises: the device comprises a driving cylinder body 1, a driving piston 2, a transmission connecting rod 3, a compression spring 4, a guide pipe 5, a driven cylinder body 6, a driven piston 7 and an optical fiber hook 8; the driving piston 2 is sleeved with the driving cylinder body 1, the transmission connecting rod 3 penetrates through the upper cover of the driving cylinder body 1 to be connected with the driving piston 2, the compression spring 4 is sleeved on the part, exposed outside the driving cylinder body 1, of the transmission connecting rod 3, one end of the compression spring 4 is connected with the upper cover of the driving cylinder body 1, one end of the compression spring 4 is connected with one end, far away from the driving piston 2, of the transmission connecting rod 3 outside the driving cylinder body 1, the driving cylinder body 1 is connected with the driven cylinder body 6 through the guide pipe 5, the driven piston 7 is sleeved with the driven cylinder body 6, and the lower portion of the driven piston 7 is.
In some specific application scenarios of the present embodiment, the compression spring 4 may be replaced by spring devices with different strengths according to the hardness of the optical fiber or optical cable.
In some specific application scenarios of this embodiment, the transmission connecting rod 3 is a hollow structure for reducing the weight of the transmission connecting rod 3, and is favorable for reducing the influence of the gravity of the transmission connecting rod 3 on the compression spring 4 when the compression spring recovers from the compression state after the well lid is removed.
Further, the transmission connecting rod 3 is specifically a two-section rotary telescopic structure for adjusting the length of the transmission connecting rod 3 to adapt to different installation distances between the driving cylinder body 1 below the well lid and the well lid.
In some specific application scenes of this embodiment, the pipe 5 is specifically a metal pipe, and the metal pipe has better rigidity, is different from ordinary hose, and difficult for being impacted by rivers and take place deformation and then lead to 6 liquid level of slave cylinder body to change.
Furthermore, the metal conduit 5 is specifically a copper metal conduit, which has certain rigidity but also has flexibility, so that the connection between the driving cylinder 1 and the driven cylinder 6 is facilitated, and the change of the liquid pressure in the driving cylinder 1 and the driven cylinder 6 caused by the water flow and sludge extrusion line can be reduced. Furthermore, the transmission connecting rod 3 is made of non-metallic materials. The non-metal material is beneficial to reducing the heat-conducting property of the transmission connecting rod 3, and the transmission connecting rod 3 is prevented from conducting heat of a metal well cover on the ground surface to transmission liquid in summer to cause the volume of the transmission liquid to expand at high temperature; reducing the thermal conductivity of the drive link 3 can also prevent the drive link 3 from conducting the heat of the drive fluid to the well lid in winter, causing the drive fluid to solidify at low temperatures. The metal conduit is externally provided with a coating layer for heat preservation and heat insulation;
the transmission liquid filled in the driving cylinder body 1, the driven cylinder body 6 and the guide pipe 5 is specifically low-temperature hydraulic oil with the thermal conductivity coefficient lower than 0.14W/(m.K) and the condensation temperature lower than minus 30 ℃, and the low-temperature hydraulic oil mainly comprises the following components: the aviation hydraulic oil, the low-freezing-point anti-wear hydraulic oil and the multistage hydraulic oil are preferably the aviation hydraulic oil in the embodiment because the aviation hydraulic oil has lower viscosity and better fluidity at low temperature.
Furthermore, the transmission connecting rod 3 is made of engineering plastics. The thermal conductivity of engineering plastics is generally lower than 0.3W/(m.K), which is much lower than that of any metal material.
Furthermore, considering the inflammability of low-temperature hydraulic oil in a high-temperature environment in south China, the low-temperature hydraulic oil can also be selected from flame-resistant low-temperature hydraulic oil which is flame-resistant hydraulic oil with an organic acid ester as base oil and has a flame self-extinguishing function and strong biodegradability. Not only has excellent oxidation resistance, abrasion resistance, rust resistance and foam resistance, but also can minimize the risk of fire and explosion when the oil product contacts with flame or a hot surface. Meanwhile, the flame-retardant low-temperature hydraulic oil has good anticoagulation and low-temperature fluidity and can be used in an environment of-40 ℃;
in some specific application scenarios of this embodiment, as shown in fig. 2, the portion of the driven cylinder 6 without transmission liquid is a hollow disturbance cavity, and the disturbance cavity is a hollow cavity formed by extending the side wall of the driven cylinder 6 downward, so that the side wall of the driven cylinder 6 is also used to prevent the optical fiber hung on the optical fiber hook 8 from being impacted by flowing water, garbage, and sludge to generate false alarm, thereby avoiding the occurrence of false alarm and alarm failure. In the disturbance cavity, the driven piston 7 drives the optical fiber hook 8 to move through the reciprocating motion of the piston, so that the optical fiber hung on the optical fiber hook 8 is deformed, and the disturbance to the optical fiber is generated. An opening for inserting an optical fiber or an optical cable is arranged at the lower part of the side wall of the driven cylinder body 6; the bottom of the driven cylinder body 6 is provided with a detachable bottom cover which is used for hanging and installing optical fiber cables after the bottom cover is opened. After the installation is finished, the bottom cover is closed, and flowing water, silt and garbage are prevented from flowing into the bottom of the driven cylinder body 6 to impact and disturb the optical fibers and the connecting structural members in the cavity.
Further, a rotating mechanism which can horizontally rotate and can lock the rotating angle is also arranged between the driven piston 7 and the optical fiber hook 8. The rotation angle of the lock is specifically 0 to 180 degrees, and the rotation angle of the lock is preferably 0 and 180 degrees. After the optical fiber or the optical cable is hung, the optical cable hanging point can be rotated by about 180 degrees through the knob, so that the optical fiber or the optical cable is staggered below the hanging point, the deformation of the optical fiber or the optical cable generated by pulling the optical fiber or the optical cable when the driven piston 7 moves upwards is increased, and the optical fiber or the optical cable can be hung and staggered quickly underground. In one embodiment, as shown in FIG. 2, the rotating mechanism is rotated horizontally 180 degrees so that the fiber turns into a turn having a diameter of no more than 6 cm. The device is most sensitive to fiber disturbances.
Further, a height adjusting device is arranged above or below the rotating mechanism and used for finely adjusting the height of the optical fiber hook 8.
Further, the height adjusting device is formed by sleeving a screw rod and a nut between the optical fiber hook 8 and the driven piston 7 in series. The distance between the fiber hook 8 and the slave piston 7 can be adjusted by rotating the screw.
Furthermore, a vibration starting spring is connected between the upper part of the optical fiber hook 8 and the driven piston 7 in series, and when the optical fiber hook 8 moves upwards along with the driven piston 7, the time length of the optical fiber subjected to disturbance is prolonged through the reciprocating motion after sudden pulling. In the polarization state optical fiber sensing, the transient polarization state changes, the polarization state change signals are easily mixed in noise and are not easy to identify, and the time length of the optical fiber subjected to disturbance is prolonged through a spring.
In some specific application scenarios of this embodiment, as shown in fig. 3, the fiber hook 8 is provided with a spring lock to prevent the fiber or the optical cable from slipping off the hook when the driven piston 7 falls down.
Furthermore, the power communication optical fiber is any one of 24-128 cores of common armored multi-core optical fiber, the outer diameter of the common armored multi-core optical fiber needs to be less than 8cm, preferably 1cm, and the common armored multi-core optical fiber with the outer diameter of about 1cm is generally common 96-core armored optical fiber, so that the power communication and optical fiber sensing use is completely met.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An optical fiber sensing device based on hydraulic linkage, comprising: the device comprises a driving cylinder body (1), a driving piston (2), a transmission connecting rod (3), a compression spring (4), a guide pipe (5), a driven cylinder body (6), a driven piston (7) and an optical fiber hook (8);
the driving piston (2) is sleeved with the driving cylinder body (1), the transmission connecting rod (3) penetrates through the upper cover of the driving cylinder body (1) to be connected with the driving piston (2), the compression spring (4) is sleeved on the part, exposed out of the driving cylinder body (1), of the transmission connecting rod (3), one end of the compression spring (4) is connected with the upper cover of the driving cylinder body (1), one end of the compression spring (4) is connected with one end, far away from the driving piston (2), of the transmission connecting rod (3) outside the driving cylinder body (1), the driving cylinder body (1) is connected with the driven cylinder body (6) through a guide pipe (5), the driven piston (7) is sleeved with the driven cylinder body (6), and the lower part of the driven piston (7) is connected with the optical fiber hook (8).
2. The optical fiber sensing device based on hydraulic linkage as claimed in claim 1, wherein the transmission link (3) is a hollow structure.
3. The optical fiber sensing device based on hydraulic linkage as claimed in claim 2, wherein the transmission link (3) is embodied as a two-segment telescopic structure.
4. The fiber optic hydraulic linkage-based sensing device according to claim 1, wherein the conduit (5) is embodied as a metal conduit.
5. The optical fiber sensing device based on hydraulic linkage as claimed in claim 4, wherein the material of the transmission connecting rod (3) is non-metallic material;
a heat insulation coating layer is arranged outside the conduit (5);
the transmission liquid filled in the driving cylinder body (1), the driven cylinder body (6) and the guide pipe (5) is low-temperature hydraulic oil with a thermal conductivity coefficient lower than 0.14W/(m.K) and a condensation temperature lower than-30 ℃.
6. The optical fiber sensing device based on hydraulic linkage as claimed in claim 1, wherein the part of the driven cylinder body (6) without transmission liquid is a hollow disturbance cavity, and the lower part of the side wall of the driven cylinder body (6) is provided with an opening for penetrating an optical fiber or an optical cable; the bottom of the slave cylinder body (6) is provided with a detachable bottom cover.
7. The optical fiber sensing device based on hydraulic linkage as claimed in claim 1, further comprising a rotation mechanism capable of rotating horizontally and locking the rotation angle between the driven piston (7) and the optical fiber hook (8).
8. The fiber optic sensor device based on hydraulic linkage as claimed in claim 7, wherein a height adjusting device is further provided above or below the rotating mechanism.
9. The optical fiber sensing device based on hydraulic linkage as claimed in any one of claims 7-8, wherein a vibration-starting spring is connected in series between the upper part of the optical fiber hook (8) and the driven piston.
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| CN201922294037.0U CN210952871U (en) | 2019-12-18 | 2019-12-18 | Optical fiber sensing device based on hydraulic linkage |
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| CN201922294037.0U CN210952871U (en) | 2019-12-18 | 2019-12-18 | Optical fiber sensing device based on hydraulic linkage |
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| CN210952871U true CN210952871U (en) | 2020-07-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097889A (en) * | 2020-09-22 | 2020-12-18 | 武汉钢铁有限公司 | Weight weighing device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097889A (en) * | 2020-09-22 | 2020-12-18 | 武汉钢铁有限公司 | Weight weighing device |
| CN112097889B (en) * | 2020-09-22 | 2022-09-13 | 武汉钢铁有限公司 | Weight weighing device |
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