CN209845093U - Novel camera for monitoring welding pool - Google Patents
Novel camera for monitoring welding pool Download PDFInfo
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- CN209845093U CN209845093U CN201920937320.8U CN201920937320U CN209845093U CN 209845093 U CN209845093 U CN 209845093U CN 201920937320 U CN201920937320 U CN 201920937320U CN 209845093 U CN209845093 U CN 209845093U
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Abstract
The utility model discloses a novel camera for monitoring a welding pool, which has modularized structure, convenient step-by-step assembly and simplified structure; an illumination light source is added, so that the image is clear; the service life is prolonged by adding a cooling device. A novel camera for monitoring a welding pool comprises an internal support, a rear shell, an insulating fixing box, an LED lamp panel and a protective cover; the inner support comprises a support main body in a cuboid shape, five side walls of the support main body are provided with first through holes, the support main body is used for mounting circuit components, the rest one side wall of the support main body extends to the periphery to form a rectangular first mounting plate, four corners of the first mounting plate are provided with second through holes, the middle position of the first mounting plate protrudes out of a cuboid first mounting seat, the middle of the first mounting seat is provided with a third through hole, and the third through hole is used for mounting an electric focusing camera; the tail part of the electric focusing camera is inserted into the third through hole, and the first screw penetrates through the first mounting seat to press the tail part of the electric focusing camera to be fixed.
Description
Technical Field
The utility model belongs to the technical field of the camera, specifically speaking relates to a novel camera for monitoring welding bath.
Background
In the arc welding process, under the action of electric arc, the local part of the base metal and the filling metal are heated and melted to form a molten pool, and a welding seam is formed after cooling and solidification. Therefore, in order to further improve the welding efficiency and the welding quality, not only the welding process parameters need to be researched, but also the welding process needs to be emphasized. The observation of the flow of the molten pool is essential for understanding the quality of the weld joint, the defect of the air hole and the mechanical property.
The CN201530136198.1 digital high dynamic range welding camera produced by the company enables an operator to remotely and clearly observe an enlarged molten pool image through a monitor, can judge the conditions of the position of a welding wire, the molten pool state, whether the welding wire is centered and the like through the image, releases the operator from a severe smoke radiation environment, saves labor and improves welding quality. But the following defects exist in the using process: 1. the structure is complex, the operation is complex in the installation and use process, the components are not modularized, and the maintenance and the replacement are inconvenient; 2. the auxiliary light source is lacked for illumination, and the image definition of a molten pool is not enough; 3. the cooling device is lacked, and the service life is short;
in the process of monitoring the welding pool by using the camera on site, the camera is influenced by a large amount of heat generated by electric arc and laser, so that the temperature of the camera for monitoring the welding pool is increased, the monitoring quality of the camera is influenced due to overhigh temperature, the remote monitoring of workers is fuzzy, even the camera for monitoring the welding pool is paralyzed, the camera needs to be taken to a factory for maintenance, manpower and material resources are wasted, and therefore, the camera for monitoring the welding pool cannot work for too long time, and the welding efficiency is reduced.
Disclosure of Invention
The utility model aims at providing a novel camera for monitoring a welding pool, which has modularized structure, convenient step-by-step assembly and simplified structure; an illumination light source is added, so that the image is clear; the service life is prolonged by adding a cooling device.
In order to solve the technical problem, the purpose of the utility model is to realize like this:
a novel camera for monitoring a welding pool comprises an internal support, a rear shell, an insulating fixing box, an LED lamp panel and a protective cover; the inner support comprises a support main body in a cuboid shape, five side walls of the support main body are provided with first through holes, the support main body is used for mounting circuit components, the rest one side wall of the support main body extends to the periphery to form a rectangular first mounting plate, four corners of the first mounting plate are provided with second through holes, the middle position of the first mounting plate protrudes out of a cuboid first mounting seat, the middle of the first mounting seat is provided with a third through hole, and the third through hole is used for mounting an electric focusing camera; the tail part of the electric focusing camera is inserted into the third through hole, and the first screw penetrates through the first mounting seat to press the tail part of the electric focusing camera to be fixed; the insulating fixing box is cuboid and hollow, a first partition plate is arranged inside the insulating fixing box, a fourth through hole is formed in the middle of the first partition plate, the head of the electric focusing camera passes through the fourth through hole, first countersunk holes are formed in four corners of the front surface of the first partition plate, and connecting columns are protruded from the middles of four edges of the front surface of the first partition plate; the rear shell is cuboid and hollow, the upper surface and the lower surface of the interior of the rear shell respectively protrude to form a step-shaped first boss and a step-shaped second boss, the bracket main body is inserted into the rear shell and is clamped and fixed by the first boss and the second boss, the two ends of the front surface of the first boss are provided with first blind holes, and the two ends of the front surface of the second boss are provided with second blind holes; the first countersunk head screw penetrates through the first countersunk head hole, the second through hole, the first blind hole and the second blind hole to be connected and fixed, and the front end face of the rear shell is attached to the rear end face of the insulating fixing box; a fifth through hole is formed in the middle of the LED lamp panel, an LED bulb is arranged on the LED lamp panel, a second screw penetrates through the LED lamp panel and is fixedly connected with the connecting column, and the head of the electric focusing camera penetrates through the fifth through hole; the protective cover comprises a glass fixing plate and a front windshield; the inner part of the glass fixing plate is hollow, a second partition plate is arranged inside the glass fixing plate, a sixth through hole is formed in the middle of the second partition plate, the head of the electric focusing camera is arranged opposite to the sixth through hole, a seventh through hole is formed in the second partition plate, the LED bulb is opposite to the seventh through hole, and the baffle glass is used for shielding the sixth through hole and the seventh through hole; second countersunk holes are formed in four corners of the front surface of the glass fixing plate, second countersunk screws penetrate through the second countersunk holes to be fixedly connected with the insulating fixing box, and the front end face of the insulating fixing box is attached to the rear end face of the glass fixing plate.
On the basis of the above scheme and as a preferable scheme of the scheme: the insulating column and the insulating plate are also included; the four insulating columns are respectively and correspondingly arranged on the four second through holes of the first mounting plate; the insulating plate is matched with the first mounting plate, an eighth through hole is formed in the middle of the insulating plate, the inner edge of the insulating plate is inwards recessed to form a step shape, the support main body penetrates through the eighth through hole, and the insulating plate wraps the edge of the first mounting plate; the countersunk head screw passes through the first countersunk hole, the insulating column, the second through hole, the insulating plate, the first blind hole and the second blind hole to be connected and fixed.
On the basis of the above scheme and as a preferable scheme of the scheme: the four corners of the LED lamp panel are provided with LED bulbs, the seventh through holes are formed in the four corners of the second partition plate, and the four LED bulbs correspond to the four seventh through holes respectively.
On the basis of the above scheme and as a preferable scheme of the scheme: two opposite clamping grooves are formed in the upper edge and the lower edge of the glass fixing plate, a ninth through hole is formed in the clamping grooves, the front windshield penetrates through the two clamping grooves, and the second screws penetrate through the two clamping grooves respectively to clamp and fix the glass plate.
On the basis of the above scheme and as a preferable scheme of the scheme: a tenth through hole is formed in the rear surface of the second boss of the rear shell and communicated with the interior of the rear shell; a water cooling head is embedded in the tenth through hole, a bottom cover is fixed on the rear shell, and a joint of the water cooling head penetrates through the bottom cover.
On the basis of the above scheme and as a preferable scheme of the scheme: an eleventh through hole is formed in the middle of the bottom cover and used for enabling a lead to penetrate out, two twelfth through holes are formed in the bottom cover and used for enabling a joint of the water-cooling head to penetrate out, a ground-third countersunk hole is formed in the bottom cover, and a third countersunk screw penetrates through the third countersunk hole and is connected with the water-cooling head and the rear shell respectively.
Compared with the prior art, the utility model outstanding and profitable technological effect is:
the utility model discloses a novel camera of control welding molten bath, including inside support, backshell, insulating fixed box, LED lamp plate and safety cover, realized the installation of multimode, the support adopts the screw connection between each module, easy dismounting; an LED lamp panel is arranged in the insulating fixed box and used for providing auxiliary illumination, so that a molten pool image is clear; the water cooling head side face heat dissipation is additionally arranged on the rear shell, the problem that the camera is shut down to work or is accidentally damaged due to the fact that the camera is too high in temperature can be effectively solved, and the cost of manpower and material resources is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of the explosion structure of the present invention.
Fig. 2 is a schematic diagram of the explosion structure of the present invention.
Fig. 3 is a schematic diagram of a partially assembled structure of the present invention.
Fig. 4 is a schematic diagram of the exploded cross-sectional structure of the present invention.
Fig. 5 is a schematic view of the internal support structure of the present invention.
Fig. 6 is a schematic structural view of the insulating fixing box of the present invention.
Fig. 7 is a schematic view of the rear housing structure of the present invention.
Fig. 8 is a schematic view of the rear housing structure of the present invention.
Fig. 9 is a schematic view of the explosion structure of the protective cover of the present invention.
Fig. 10 is the utility model discloses a LED lamp plate structure schematic diagram.
Fig. 11 is a schematic view of the structure of the insulating plate of the present invention.
Fig. 12 is a schematic structural diagram of the bottom cover of the present invention.
Fig. 13 is a schematic sectional view of the water cooling head of the present invention.
Fig. 14 is a schematic diagram of the explosion structure of the present invention.
Reference numerals: the inner support 01, a support body 010, a first through hole 0100, a first mounting plate 011, a second through hole 0110, a first mounting seat 012, a third through hole 0120, a rear shell 02, a first boss 020, a first blind hole 0200, a second boss 021, a tenth through hole 0210, a second blind hole 0210, an insulating fixing box 03, a first clapboard 030, a fourth through hole 0300, a first counter bore 0301, a connecting column 0302, an LED lamp panel 04, a fifth through hole 040, an LED bulb 041, a protective cover 05, a glass fixing plate 050, a second clapboard 0500, a sixth through hole 0501, a seventh through hole 0502, a second counter bore 0503, a clamping groove 0504, a ninth through hole 05040, a front glass 051, an electric focusing camera 06, an insulating column 07, an insulating plate 08, an eighth through hole 080, a water cooling head 09, a bottom cover 10, an eleventh through hole 100, a twelfth through hole 101, and a third counter bore 102;
Detailed Description
The present invention will be further described with reference to the following detailed description;
the embodiment provides a novel camera for monitoring a welding pool, which comprises an internal support 01, a rear shell 02, an insulating fixing box 03, an LED lamp panel 04 and a protective cover 05; the internal support is arranged in an internal space formed by splicing a rear shell and an insulating fixing box, the internal support is provided with an electric focusing camera 06, the LED lamp panel is arranged in the insulating fixing box, and the protective cover is arranged on the insulating fixing box; the protective cover plays a role in protecting the electric focusing camera which is used for monitoring a welding pool, and the rear shell and the insulating fixing box play a role in protecting the internal support;
the inner support comprises a support main body 010 in a cuboid shape, five side walls of the support main body are provided with first through holes 0100, and the inside of the support main body is communicated with the outside through the first through holes; the shapes of the first through holes are different and are arranged as required; the bracket main body is used for mounting circuit components, the circuit components are existing products and are electrically connected with the electric focusing camera, and the mounting positions of the circuit components are determined according to actual conditions;
the rest one side wall of the support main body extends to the periphery to form a rectangular first mounting plate 011, second through holes 0110 are formed in four corners of the first mounting plate, the first mounting plate is used for being connected with the insulating fixing box and the rear shell, and the four second through holes are used for being stably mounted;
the middle position of the first mounting plate protrudes out of the first mounting seat 012 of the cuboid, the middle of the first mounting seat is provided with a third through hole 0120, the third through hole is communicated with the inside of the bracket main body, the third through hole is used for mounting an electric focusing camera, and the electric focusing camera is the prior art, is not the invention technical point of the patent application, and is not described herein again; the tail part of the electric focusing camera is inserted into the third through hole, a first screw (not shown in the figure) penetrates through the first mounting seat to press the tail part of the electric focusing camera to form fixation, and the circuit component is electrically connected with the electric focusing camera; four first screws penetrate through the first mounting seat from four directions respectively to be pressed, so that the electric focusing camera is more stably fixed;
the insulation fixing box is cuboid and hollow, a first partition plate 030 is arranged inside the insulation fixing box, a fourth through hole 0300 is formed in the middle of the first partition plate, the head of the electric focusing camera penetrates through the fourth through hole, first countersunk holes 0301 are formed in four corners of the front surface of the first partition plate, the first countersunk holes and the second through hole are oppositely arranged, connecting columns 0302 protrude from the middle of four edges of the front surface of the first partition plate, and the connecting columns are used for being connected with the LED lamp panel;
the rear shell is cuboid and hollow, the upper surface and the lower surface of the interior of the rear shell are respectively protruded to form a first boss 020 and a second boss 021 which are step-shaped, the bracket main body is inserted into the rear shell and is clamped and fixed by the first boss and the second boss, the two ends of the front surface of the first boss are provided with a first blind hole 0200, and the two ends of the front surface of the second boss are provided with a second blind hole 0210; the two first blind holes and the two second blind holes are respectively arranged opposite to the second through holes;
a first countersunk screw (not shown in the figure) passes through the first countersunk hole and the second through hole to be connected and fixed with the first blind hole and the second blind hole, and the front end surface of the rear shell is attached to the rear end surface of the insulating fixing box; the insulation fixing box, the first mounting plate and the rear shell are fixedly connected through the first countersunk head screw, and the insulation fixing box, the first mounting plate and the rear shell are convenient to disassemble and assemble in a screw connection mode;
a fifth through hole 040 is formed in the middle of the LED lamp panel, an LED bulb 041 is arranged on the LED lamp panel, a second screw penetrates through the LED lamp panel and is fixedly connected with the connecting column, and the head of the electric focusing camera penetrates through the fifth through hole; the LED lamp panel is used for providing light illumination, so that a molten pool image is clear;
the protective cover comprises a glass fixing plate 050 and front windshield 051; the glass fixing plate is hollow, a second partition plate 0500 is arranged inside the glass fixing plate, a sixth through hole 0501 is formed in the middle of the second partition plate, the head of the electric focusing camera is opposite to the sixth through hole, a seventh through hole 0502 is formed in the second partition plate, the LED bulb is opposite to the seventh through hole, the illuminating light of the LED bulb penetrates through the second partition plate, front-stop glass is used for shielding the sixth through hole and the seventh through hole, and front-stop glass is used for protecting the electric focusing camera and the LED bulb;
second countersunk holes 0503 are formed in four corners of the front surface of the glass fixing plate, second countersunk screws penetrate through the second countersunk holes to be fixedly connected with the insulating fixing box, and the front end surface of the insulating fixing box is attached to the rear end surface of the glass fixing plate; the glass fixing plate and the insulating fixing box are connected by screws, so that the glass fixing plate and the insulating fixing box can be conveniently disassembled and assembled;
the assembling process comprises the following steps: a circuit component is installed on a support main body of the internal support, an electric focusing camera is installed on a first installation seat, the support main body is inserted into the rear shell, the head of the electric focusing camera is inserted into the insulation fixing box, and the first partition plate, the first installation plate and the rear shell are fixedly connected through a first countersunk head screw; then, the LED lamp panel is installed on the insulation fixing box, and finally, the protective cover is fixed on the insulation fixing box; the utility model discloses cut apart the camera structure into a plurality of modules alone, make things convenient for dismouting, maintenance; the LED lamp panel provides an auxiliary light source for illumination, so that a molten pool image is clearer;
furthermore, the insulating column 07 and the insulating plate 08 are also included; the insulating columns and the insulating plate are made of insulating materials, the insulating columns are cylindrical, and the four insulating columns are respectively correspondingly arranged on the four second through holes of the first mounting plate; the insulating plate is matched with the first mounting plate, an eighth through hole 080 is formed in the middle of the insulating plate, the inner edge of the insulating plate is recessed inwards to form a step shape, the support main body penetrates through the eighth through hole, and the insulating plate wraps the edge of the first mounting plate; the countersunk head screw penetrates through the first countersunk hole, the insulating column, the second through hole and the insulating plate to be connected and fixed with the first blind hole and the second blind hole; the internal insulation is realized by additionally arranging the insulating column and the insulating plate, so that the use is not influenced by static electricity;
further, four corners of the LED lamp panel are provided with LED bulbs, four corners of the second partition plate are provided with seventh through holes, and the four LED bulbs correspond to the four seventh through holes respectively; the four LED bulbs can provide the maximum illumination effect, the illumination range is maximum at four corners, and the molten pool image is clearer;
furthermore, two opposite clamping grooves 0504 are formed in the upper edge and the lower edge of the glass fixing plate, a ninth through hole 05040 is formed in each clamping groove, the front windshield penetrates through the two clamping grooves, and the second screws penetrate through the two clamping grooves respectively to clamp and fix the glass plate; the front windshield is fixed on the glass fixing plate by using a second screw in an inserting mode, so that the assembly, disassembly and replacement are convenient, and the assembly efficiency is high;
furthermore, a tenth through hole 0210 is formed in the rear surface of the second boss of the rear shell, and the tenth through hole is communicated with the inside of the rear shell; a water cooling head 09 is embedded into the tenth through hole, a bottom cover 10 is fixed on the rear shell, and a joint of the water cooling head penetrates through the bottom cover; an eleventh through hole 100 is formed in the middle of the bottom cover and used for a lead to pass through, two twelfth through holes 101 are formed in the bottom cover and used for a joint of the water cooling head to pass through, a third countersunk hole 102 is formed in the bottom cover, and a third countersunk screw passes through the third countersunk hole and is respectively connected with the water cooling head and the rear shell; one of the joint of water-cooling head is the export for one imports, and the water-cooling head not only can effectually give camera itself the heat dissipation through hydrologic cycle or wind cycle, simultaneously, also can "send" the heat of coming around to go, increases life, can effectually solve camera high temperature and make camera shut down work and unexpected problem of destroying, simultaneously great reduction manpower and materials cost.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like refer to the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, or the orientation or position relationship that one skilled in the art conventionally understands, and are only for convenience of describing the present invention and simplifying the description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (6)
1. A novel camera for monitoring a weld puddle, characterized by: the LED lamp comprises an internal support, a rear shell, an insulating fixing box, an LED lamp panel and a protective cover;
the inner support comprises a support main body in a cuboid shape, five side walls of the support main body are provided with first through holes, the support main body is used for mounting circuit components, the rest one side wall of the support main body extends to the periphery to form a rectangular first mounting plate, four corners of the first mounting plate are provided with second through holes, the middle position of the first mounting plate protrudes out of a cuboid first mounting seat, the middle of the first mounting seat is provided with a third through hole, and the third through hole is used for mounting an electric focusing camera; the tail part of the electric focusing camera is inserted into the third through hole, and the first screw penetrates through the first mounting seat to press the tail part of the electric focusing camera to be fixed;
the insulating fixing box is cuboid and hollow, a first partition plate is arranged inside the insulating fixing box, a fourth through hole is formed in the middle of the first partition plate, the head of the electric focusing camera passes through the fourth through hole, first countersunk holes are formed in four corners of the front surface of the first partition plate, and connecting columns are protruded from the middles of four edges of the front surface of the first partition plate;
the rear shell is cuboid and hollow, the upper surface and the lower surface of the interior of the rear shell respectively protrude to form a step-shaped first boss and a step-shaped second boss, the bracket main body is inserted into the rear shell and is clamped and fixed by the first boss and the second boss, the two ends of the front surface of the first boss are provided with first blind holes, and the two ends of the front surface of the second boss are provided with second blind holes;
the first countersunk head screw penetrates through the first countersunk head hole, the second through hole, the first blind hole and the second blind hole to be connected and fixed, and the front end face of the rear shell is attached to the rear end face of the insulating fixing box;
a fifth through hole is formed in the middle of the LED lamp panel, an LED bulb is arranged on the LED lamp panel, a second screw penetrates through the LED lamp panel and is fixedly connected with the connecting column, and the head of the electric focusing camera penetrates through the fifth through hole;
the protective cover comprises a glass fixing plate and a front windshield; the inner part of the glass fixing plate is hollow, a second partition plate is arranged inside the glass fixing plate, a sixth through hole is formed in the middle of the second partition plate, the head of the electric focusing camera is arranged opposite to the sixth through hole, a seventh through hole is formed in the second partition plate, the LED bulb is opposite to the seventh through hole, and the baffle glass is used for shielding the sixth through hole and the seventh through hole; second countersunk holes are formed in four corners of the front surface of the glass fixing plate, second countersunk screws penetrate through the second countersunk holes to be fixedly connected with the insulating fixing box, and the front end face of the insulating fixing box is attached to the rear end face of the glass fixing plate.
2. The novel camera for monitoring a weld puddle as defined in claim 1, wherein: the insulating column and the insulating plate are also included; the four insulating columns are respectively and correspondingly arranged on the four second through holes of the first mounting plate; the insulating plate is matched with the first mounting plate, an eighth through hole is formed in the middle of the insulating plate, the inner edge of the insulating plate is inwards recessed to form a step shape, the support main body penetrates through the eighth through hole, and the insulating plate wraps the edge of the first mounting plate; the countersunk head screw passes through the first countersunk hole, the insulating column, the second through hole, the insulating plate, the first blind hole and the second blind hole to be connected and fixed.
3. The novel camera for monitoring a weld puddle as defined in claim 1, wherein: the four corners of the LED lamp panel are provided with LED bulbs, the seventh through holes are formed in the four corners of the second partition plate, and the four LED bulbs correspond to the four seventh through holes respectively.
4. The novel camera for monitoring a weld puddle as defined in claim 1, wherein: two opposite clamping grooves are formed in the upper edge and the lower edge of the glass fixing plate, a ninth through hole is formed in the clamping grooves, the front windshield penetrates through the two clamping grooves, and the second screws penetrate through the two clamping grooves respectively to clamp and fix the glass plate.
5. The novel camera for monitoring a weld puddle as defined in claim 1, wherein: a tenth through hole is formed in the rear surface of the second boss of the rear shell and communicated with the interior of the rear shell; a water cooling head is embedded in the tenth through hole, a bottom cover is fixed on the rear shell, and a joint of the water cooling head penetrates through the bottom cover.
6. The novel camera for monitoring a weld puddle as defined in claim 5, wherein: an eleventh through hole is formed in the middle of the bottom cover and used for enabling a lead to penetrate out, two twelfth through holes are formed in the bottom cover and used for enabling a joint of the water cooling head to penetrate out, a third countersunk hole is formed in the bottom cover, and a third countersunk screw penetrates through the third countersunk hole and is connected with the water cooling head and the rear shell respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920937320.8U CN209845093U (en) | 2019-06-20 | 2019-06-20 | Novel camera for monitoring welding pool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920937320.8U CN209845093U (en) | 2019-06-20 | 2019-06-20 | Novel camera for monitoring welding pool |
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| CN209845093U true CN209845093U (en) | 2019-12-24 |
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| CN201920937320.8U Active CN209845093U (en) | 2019-06-20 | 2019-06-20 | Novel camera for monitoring welding pool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155213A (en) * | 2021-04-22 | 2021-07-23 | 汇中仪表股份有限公司 | Method for installing, measuring and maintaining open channel ultrasonic flowmeter |
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2019
- 2019-06-20 CN CN201920937320.8U patent/CN209845093U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155213A (en) * | 2021-04-22 | 2021-07-23 | 汇中仪表股份有限公司 | Method for installing, measuring and maintaining open channel ultrasonic flowmeter |
| CN113155213B (en) * | 2021-04-22 | 2022-09-02 | 汇中仪表股份有限公司 | Method for installing, measuring and maintaining ultrasonic flow meter of open channel |
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