CN212823553U - Dust removal air duct of robot plasma groove cutting workbench - Google Patents
Dust removal air duct of robot plasma groove cutting workbench Download PDFInfo
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- CN212823553U CN212823553U CN202021655049.8U CN202021655049U CN212823553U CN 212823553 U CN212823553 U CN 212823553U CN 202021655049 U CN202021655049 U CN 202021655049U CN 212823553 U CN212823553 U CN 212823553U
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- side plate
- dust removal
- front side
- removal air
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- Arc Welding In General (AREA)
Abstract
The utility model provides a plasma groove cutting table dust removal wind channel of robot has solved the problem that high temperature smoke and dust granule gets into dust removal wind channel and can produce the potential safety hazard. The utility model comprises a workbench for plasma cutting, and a plurality of dust removing air channels formed by interconnecting a plurality of dust removing air channel units are distributed around the workbench; the dust removal air channel unit comprises a bottom plate, a front side plate is fixedly arranged on the front side of the bottom plate, a rear side plate is arranged on the rear side of the bottom plate, packaging plates are arranged on the left side and the right side of the front side plate and the rear side plate respectively, a flue communicated with the interior of the dust removal air channel unit is arranged in the middle of each packaging plate, a smoke inlet is formed in the middle of each front side plate, a protection plate is fixedly connected onto each front side plate through a support rod, a gap is formed between the lower portion of each protection plate and each front side plate, the protection plate is located in front of the smoke inlet, and the; and the top of the front side plate and the top of the rear side plate are provided with top plates for packaging.
Description
Technical Field
The utility model relates to a weld cigarette dust pelletizing system, especially indicate a robot plasma groove cutting workstation dust removal wind channel.
Background
Negatively charged electrons in the plasma are in equilibrium with positively charged ions, which can pass large currents and thus have high energy densities and extremely high temperatures. The metal can be cut, cut and sprayed by controlling the energy density, the temperature, the running speed and the like of the plasma arc. Plasma arc cutting is to heat the cut metal to a melting state by using plasma arc, then blow the melted metal by using auxiliary gas, achieve the cutting purpose, the compressed plasma arc temperature is generally 10000-15000 ℃, the temperature after water recompression can reach 50000 ℃ at most, so the energy density of the arc is quite high, and when the thin plate with the thickness of less than 20mm is cut, the plasma arc cutting has the advantages of high speed, small deformation, high precision, high section smoothness and the like.
Smoke and dust harmful to human bodies are generated when plasma cutting is performed, and the smoke and the harm are mainly classified into the following two types:
1. hazard of metal fumes: the composition of the electric dust varies depending on the welding rod used. The welding rod consists of a core wire and a coating. The core wire contains a large amount of iron, carbon, manganese, silicon, chromium, nickel, sulfur, phosphorus and the like; the materials in the medicine skin mainly comprise marble, fluorite, rutile, pure salt, water glass, ferromanganese and the like. During cutting, the arc discharge generates a high temperature of 4000-6000 ℃, a great deal of smoke is generated while welding rods and weldments are melted, the components of the smoke mainly comprise ferric oxide, manganese oxide, silicon dioxide, silicate and the like, and smoke particles are diffused in the working environment and are very easy to be absorbed into the lung. Long-term inhalation causes lung tissue fibrosis, namely called as electric welder pneumoconiosis, and is often accompanied with manganese poisoning, fluorine poisoning, metal smoke heat and the like. The patients mainly show respiratory system symptoms such as chest distress, chest pain, short breath, cough and the like, and are accompanied with symptoms such as headache, general weakness and the like, and the lung has certain damage through the qi function.
2. Hazard of toxic gas: under the action of high temperature and strong ultraviolet rays generated by the cutting arc, a large amount of toxic gases, such as carbon monoxide, nitrogen oxides and the like, are generated around the arc area. (1) Ozone, a colorless, noxious gas with a particular pungent odor, has a strong irritating effect on the respiratory mucosa and lungs. Short-term inhalation of low-concentration (0.4mg/m3) ozone can cause cough, dry throat, chest distress, anorexia, fatigue, weakness, etc., and long-term inhalation of low-concentration ozone can cause bronchitis, emphysema, and pulmonary sclerosis. (2) Carbon monoxide is colorless, tasteless and non-irritant gas, is very easily combined with hemoglobin for transporting oxygen in a human body and is very difficult to separate, so that after a large amount of hemoglobin is combined with carbon monoxide, oxygen loses the opportunity of being combined with the hemoglobin, the functions of transporting and utilizing oxygen by the human body are obstructed, and the human tissues are necrotized due to oxygen deficiency. (3) Nitrogen oxides, which are noxious gases with pungent odors, are often contacted with nitrogen oxides, mainly nitrogen dioxide. It is a reddish brown gas with special odor, and when inhaled by a person, enters the alveoli through the upper respiratory tract, and gradually reacts with water to produce severe stimulation and corrosion effects on lung tissues, thereby causing pulmonary edema.
Therefore, when performing the plasma cutting operation, it is necessary to perform a cleaning process on the smoke generated by the plasma cutting. When the smoke and dust that produces to the plasma cutting purifies, because the temperature ratio of the smoke and dust that produces is higher, often can carry a large amount of high temperatures even have the smoke and dust granule of spark, and these smoke and dust granules often can cause the injury to fan, pipeline inner wall etc. in the smoke and dust clarification plant, cause equipment to catch fire even, have very big potential safety hazard.
When the robot is used for plasma cutting, in order to cut different parts of a workpiece, the plasma cutting robot can continuously adjust displacement at the periphery of the cutting workbench, the dust removal air pipes arranged at two sides of the cutting workbench can be relatively large in size in order to timely absorb smoke dust generated by cutting, and therefore the air inlet of each dust removal air pipe is relatively large, the air inlet is far away from the dust removal air pipe, the suction force of the air inlet is relatively small, and the smoke dust absorption is relatively poor.
SUMMERY OF THE UTILITY MODEL
Get into the problem that the dust removal wind channel can produce the potential safety hazard in order to solve the high temperature smoke and dust granule that exists among the background art, the utility model provides a plasma groove cutting workstation dust removal wind channel of robot.
The technical scheme of the utility model is that: a robot plasma groove cutting workbench dust removal air duct comprises a workbench for plasma cutting, wherein a plurality of dust removal air ducts formed by mutually connecting dust removal air duct units are distributed on the periphery of the workbench; the dust removal air channel unit comprises a bottom plate, a front side plate is fixedly arranged on the front side of the bottom plate, a rear side plate is arranged on the rear side of the bottom plate, packaging plates are arranged on the left side and the right side of the front side plate and the rear side plate respectively, a flue communicated with the interior of the dust removal air channel unit is arranged in the middle of each packaging plate, a smoke inlet is formed in the middle of each front side plate, a protection plate is fixedly connected onto each front side plate through a support rod, a gap is formed between the lower portion of each protection plate and each front side plate, the protection plate is located in front of the smoke inlet, and the; and the top of the front side plate and the top of the rear side plate are provided with top plates for packaging.
The height of the front side plate is lower than that of the rear side plate, and the top plate is obliquely arranged at the tops of the front side plate and the rear side plate.
The protection plate is parallel to the front side plate.
The upper end, the left end and the right end of the protection plate are connected with the front side plate in a sealing mode, and gaps communicated with the smoke inlet are formed between the lower end of the protection plate and the front side plate.
The rear side of the interior of the dust removal air duct unit is provided with a rear partition plate, a gap is reserved between the rear partition plate and the rear side plate, and the packaging plate is provided with a cooling channel communicated with the gap between the rear partition plate and the rear side plate.
The dust removal air duct unit is internally and obliquely provided with a telescopic mechanism capable of rotating upwards, the rear end of the telescopic mechanism is hinged to the rear partition plate, the front end of the telescopic mechanism is hinged to a smoke gate, the smoke gate covers the inner side of a smoke inlet arranged on the front side plate, and the upper end of the smoke gate is hinged to the upper portion of the inner side of the front side plate through a hinge.
A protective inner shell is fixedly sleeved outside the telescopic mechanism.
The rear partition plate is provided with a protective outer shell used for protecting the telescopic structure, the rear end of the protective outer shell is connected with the rear partition plate in a sealing mode, the upper end of the protective outer shell is connected with the top plate in a sealing mode, and the front end face of the protective outer shell is provided with a notch used for enabling the protective inner shell to move up and down.
Telescopic machanism includes the cylinder, but has tilting's front frame including the front end of cylinder through the round pin hub connection, the preceding terminal surface and the flue gas door fixed connection of front frame, the fixed back ear seat that is equipped with of rear end of cylinder, the back ear seat is connected through the round pin hub rotation with the articulated seat in back of establishing on the back baffle, the cylinder is established in the protection inner shell, the rear end of cylinder is fixed to be inlayed and is established on the front panel of protection inner shell, the front frame is located the outside of protection inner shell, the rear end opening design of protection inner shell.
And flame-retardant asbestos meshes are fixedly arranged on the inner surface of the dust removal air duct unit, the surface of the rear partition plate and the inner surface of the protective shell.
The utility model has the advantages that: (1) the dust removal air duct is divided into a plurality of dust removal air duct units, the dust removal air duct units can be freely combined into various dust removal air ducts which are in accordance with the required shapes according to the actual requirements of sites, workshop conditions, working requirement space size and the like, the freedom is high, and various dust removal requirements can be met; (2) a protection plate is arranged in front of a smoke inlet in the front of the dust removal air channel unit and used for preventing high-temperature particles from directly entering the dust removal air channel through the smoke inlet to corrode and damage the fan and the inner wall of the pipeline, so that fire hazard is caused; (3) the telescopic mechanism is arranged in the dedusting air duct unit to control the smoke doors to rotate up and down so as to realize the opening and closing of the smoke ports, and according to the characteristic, when the dedusting air duct unit is used at the later stage, the opening number of the smoke doors can be controlled through the control terminal so as to achieve the purposes of controlling the dedusting range and the suction force; (4) the protective inner shell is arranged outside the telescopic mechanism and used for protecting the air cylinder, the protective inner shell, the air cylinder and the protective inner shell are arranged in the protective outer shell together (because the telescopic mechanism needs to drive the rotation of the smoke gate, the rear end of the telescopic mechanism needs to be arranged into a hinged structure with the rear partition plate, so that the rear end of the protective inner shell needs to be provided with an opening for the telescopic mechanism to move up and down, when high-temperature particles are ejected into the protective inner shell from the opening at the rear part, the air cylinder and the connecting air pipe are damaged), when the high-temperature particles accidentally enter the dust removal air duct, most of the high-temperature particles firstly collide with the front end surface of the protective inner shell and the protective outer shell and then fall on an internal asbestos gauze to be captured and do not move any more, when few high-temperature particles enter the interior from a gap between the front opening of the protective outer shell and the protective inner, the air cylinder falls on the middle front part of the protective outer shell and cannot be bounced into the protective inner shell from the rear part to damage the air cylinder and the connected air pipe; (5) set up the cooling channel of intercommunication each other at dust removal wind channel rear portion for circulation coolant, cool down the inside of dust removal pipeline and protecting sheathing internal environment, firstly reduce the high temperature granule that unexpected entering erode the inside time in dust removal wind channel, secondly reduce the temperature of high temperature flue gas, improve the operating temperature of fan, cylinder etc..
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system layout diagram of the present invention;
FIG. 2 is a schematic perspective view I of the dust-removing air duct unit shown in FIG. 1;
FIG. 3 is a schematic perspective view II of the dust-removing air duct unit shown in FIG. 1;
FIG. 4 is a right side view of the dust extraction duct unit of FIG. 3;
FIG. 5 is a schematic structural diagram I of a part of the interior of the dust removal air duct unit in FIG. 2;
FIG. 6 is a schematic view of the rear view of FIG. 5;
FIG. 7 is a schematic structural diagram II of a part of the interior of the dust removal duct unit in FIG. 2;
FIG. 8 is a schematic structural view of the telescoping mechanism of FIG. 7;
in the figure, 1, a workbench, 2, a dust removal air channel unit, 3, a top plate, 4, a front side plate, 401, a smoke inlet, 5, a packaging plate, 501, a flue, 502, a cooling channel, 6, a rear partition plate, 7, a rear side plate, 8, a protection plate, 9, a protection shell, 901, a rear hinge seat, 10, a protection inner shell, 11, an air cylinder, 12, a rear lug seat, 13 and a front frame; 14. flue gas gate, 15, hinge.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
Example 1: a robot plasma groove cutting workbench dust removing air duct is shown in figure 1 and comprises a workbench 1 for plasma cutting, wherein a plurality of dust removing air ducts formed by mutually connecting dust removing air duct units 2 are distributed on the periphery of the workbench 1; as shown in fig. 2, 3 and 4, the dust removing air duct unit 2 includes a bottom plate, a front side plate 4 is fixedly disposed on the front side of the bottom plate, a rear side plate 7 is disposed on the rear side of the bottom plate, the height of the front side plate 4 is lower than that of the rear side plate 7, and the top plate 3 is obliquely disposed on the tops of the front side plate 4 and the rear side plate 7. The left and right sides of preceding curb plate 4 and posterior lateral plate 7 all is equipped with packaging plate 5, and packaging plate 5's middle part is equipped with the flue 501 with the inside intercommunication of dust removal wind channel unit 2, and the middle part of preceding curb plate 4 is equipped with into mouth 401, is equipped with guard plate 8 through branch fixedly connected with on the preceding curb plate 4, and guard plate 8 is parallel to each other with preceding curb plate 4. A gap is formed between the lower part of the protection plate 8 and the front side plate 4, the protection plate 8 is positioned in front of the smoke inlet 401, and the area of the protection plate 8 is larger than that of the smoke inlet 401; the top of the front side plate 4 and the rear side plate 7 is provided with a top plate 3 for packaging.
As shown in fig. 4 and 6, a rear partition plate 6 is provided at the rear side of the interior of the dust removal duct unit 2, a gap exists between the rear partition plate 6 and the rear side plate 7, and a cooling passage 502 communicating with the gap between the rear partition plate 6 and the rear side plate 7 is provided on the package plate 5. As shown in fig. 7, a telescopic mechanism capable of rotating upward is obliquely arranged in the dust removal air duct unit 2, the rear end of the telescopic mechanism is hinged to the rear partition plate 6, the front end of the telescopic mechanism is hinged to the flue gas door 14, the flue gas door 14 covers the flue gas inlet 401 and is arranged on the inner side of the front side plate 4, and the upper end of the flue gas door 14 is hinged to the upper portion of the inner side of the front side plate 4 through a hinge 15. The outer part of the telescopic mechanism is fixedly sleeved with a protective inner shell 10. As shown in fig. 5, a protective outer shell 9 for protecting the telescopic structure is arranged on the rear partition plate 6, the rear end of the protective outer shell 9 is connected with the rear partition plate 6 in a sealing manner, the upper end of the protective outer shell 9 is connected with the top plate 3 in a sealing manner, and a notch for enabling the protective inner shell 10 to move up and down is formed in the front end face of the protective outer shell 9.
As shown in fig. 8, the telescopic mechanism includes a cylinder 11, the front end including the cylinder 11 is connected with a front frame 13 capable of rotating up and down through a pin shaft, the front end face of the front frame 13 is fixedly connected with a flue gas gate 14, the rear end of the cylinder 11 is fixedly provided with a rear lug seat 12, the rear lug seat 12 is connected with a rear hinge seat 901 arranged on the rear partition plate 6 through a pin shaft, the cylinder 11 is arranged in the inner protective shell 10, the rear end of the cylinder 11 is fixedly embedded on a front panel of the inner protective shell 10, the front frame 13 is located outside the inner protective shell 10, and the rear end of the inner protective shell 10 is open. And flame-retardant asbestos meshes are fixedly arranged on the inner surface of the dust removal air duct unit 2, the surface of the rear partition plate 6 and the inner surface of the protective shell 9.
The working principle is as follows: (1) the dust removal air duct is divided into a plurality of dust removal air duct units, the dust removal air duct units can be freely combined into various dust removal air ducts which are in accordance with the required shapes according to the actual requirements of sites, workshop conditions, working requirement space size and the like, the freedom is high, and various dust removal requirements can be met; (2) a protection plate is arranged in front of a smoke inlet in the front of the dust removal air channel unit and used for preventing high-temperature particles from directly entering the dust removal air channel through the smoke inlet to corrode and damage the fan and the inner wall of the pipeline, so that fire hazard is caused; (3) the telescopic mechanism is arranged in the dedusting air duct unit to control the smoke doors to rotate up and down so as to realize the opening and closing of the smoke ports, and according to the characteristic, when the dedusting air duct unit is used at the later stage, the opening number of the smoke doors can be controlled through the control terminal so as to achieve the purposes of controlling the dedusting range and the suction force; (4) the protective inner shell is arranged outside the telescopic mechanism and used for protecting the air cylinder, the protective inner shell, the air cylinder and the protective inner shell are arranged in the protective outer shell together (because the telescopic mechanism needs to drive the rotation of the smoke gate, the rear end of the telescopic mechanism needs to be arranged into a hinged structure with the rear partition plate, so that the rear end of the protective inner shell needs to be provided with an opening for the telescopic mechanism to move up and down, when high-temperature particles are ejected into the protective inner shell from the opening at the rear part, the air cylinder and the connecting air pipe are damaged), when the high-temperature particles accidentally enter the dust removal air duct, most of the high-temperature particles firstly collide with the front end surface of the protective inner shell and the protective outer shell and then fall on an internal asbestos gauze to be captured and do not move any more, when few high-temperature particles enter the interior from a gap between the front opening of the protective outer shell and the protective inner, the air cylinder falls on the middle front part of the protective outer shell and cannot be bounced into the protective inner shell from the rear part to damage the air cylinder and the connected air pipe; (5) set up the cooling channel of intercommunication each other at dust removal wind channel rear portion for circulation coolant, cool down the inside of dust removal pipeline and protecting sheathing internal environment, firstly reduce the high temperature granule that unexpected entering erode the inside time in dust removal wind channel, secondly reduce the temperature of high temperature flue gas, improve the operating temperature of fan, cylinder etc..
Example 2: the utility model provides a robot plasma groove cutting workstation dust removal wind channel, the upper end of guard plate 8, left end, right-hand member and 4 sealing connection of preceding curb plate, form between the lower extreme of guard plate 8 and preceding curb plate 4 and advance the gap of mouth 401 intercommunication, only sealed entry of leaving all around, the protective effect is better. The other structure is the same as embodiment 1.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides a plasma groove cutting workstation dust removal wind channel of robot which characterized in that: the plasma cutting machine comprises a workbench (1) for plasma cutting, wherein a plurality of dust removing air channels formed by mutually connecting dust removing air channel units (2) are distributed on the periphery of the workbench (1); the dust removal air channel unit (2) comprises a bottom plate, a front side plate (4) is fixedly arranged on the front side of the bottom plate, a rear side plate (7) is arranged on the rear side of the bottom plate, packaging plates (5) are arranged on the left side and the right side of the front side plate (4) and the rear side plate (7), a flue (501) communicated with the interior of the dust removal air channel unit (2) is arranged in the middle of each packaging plate (5), a smoke inlet (401) is formed in the middle of each front side plate (4), a protection plate (8) is fixedly connected to each front side plate (4) through a support rod, a gap is formed between the lower portion of each protection plate (8) and each front side plate (4), each protection plate (8) is located in front of the smoke inlet (401), and the area of each protection plate; the top of the front side plate (4) and the top of the rear side plate (7) are provided with a top plate (3) for packaging.
2. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 1, characterized in that: the height of the front side plate (4) is lower than that of the rear side plate (7), and the top plate (3) is obliquely arranged at the tops of the front side plate (4) and the rear side plate (7).
3. The dust removal air duct for the plasma groove cutting workbench of the robot as claimed in claim 2, characterized in that: the protection plate (8) is parallel to the front side plate (4).
4. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 2 or 3, characterized in that: the upper end, the left end and the right end of the protection plate (8) are hermetically connected with the front side plate (4), and a gap communicated with the smoke inlet (401) is formed between the lower end of the protection plate (8) and the front side plate (4).
5. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 3, characterized in that: the rear side of the interior of the dust removal air channel unit (2) is provided with a rear partition plate (6), a gap is reserved between the rear partition plate (6) and the rear side plate (7), and a cooling channel (502) communicated with the gap between the rear partition plate (6) and the rear side plate (7) is arranged on the packaging plate (5).
6. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 5, wherein: a telescopic mechanism capable of rotating upwards is obliquely arranged in the dust removal air channel unit (2), the rear end of the telescopic mechanism is hinged to the rear partition plate (6), the front end of the telescopic mechanism is hinged to a smoke gate (14), the smoke gate (14) covers a smoke inlet (401) and is arranged on the inner side of the front side plate (4), and the upper end of the smoke gate (14) is hinged to the upper portion of the inner side of the front side plate (4) through a hinge (15).
7. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 5, wherein: a protective inner shell (10) is fixedly sleeved outside the telescopic mechanism.
8. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 6, characterized in that: be equipped with protecting sheathing (9) that are used for protecting extending structure on back baffle (6), the rear end and back baffle (6) sealing connection of protecting sheathing (9), the upper end and roof (3) sealing connection of protecting sheathing (9), the preceding terminal surface of protecting sheathing (9) is equipped with the notch that supplies protection inner shell (10) to move about from top to bottom.
9. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 8, wherein: telescopic machanism includes cylinder (11), but there is fore-frame (13) of tilting including the front end of cylinder (11) through the round pin hub connection, the preceding terminal surface and flue gas door (14) fixed connection of fore-frame (13), the rear end of cylinder (11) is fixed to be equipped with back ear seat (12), back ear seat (12) are connected through the round pin hub rotation with the articulated seat (901) of back of establishing on back diaphragm (6), establish in protection inner shell (10) cylinder (11), the rear end of cylinder (11) is fixed to be inlayed and is established on the front panel of protection inner shell (10), fore-frame (13) are located the outside of protection inner shell (10), the rear end opening design of protection inner shell (10).
10. The dust removal air duct for the plasma groove cutting workbench of the robot of claim 9, wherein: and flame-retardant asbestos meshes are fixedly arranged on the inner surface of the dust removal air channel unit (2), the surface of the rear partition plate (6) and the inner surface of the protective shell (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021655049.8U CN212823553U (en) | 2020-08-10 | 2020-08-10 | Dust removal air duct of robot plasma groove cutting workbench |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021655049.8U CN212823553U (en) | 2020-08-10 | 2020-08-10 | Dust removal air duct of robot plasma groove cutting workbench |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212823553U true CN212823553U (en) | 2021-03-30 |
Family
ID=75133924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021655049.8U Expired - Fee Related CN212823553U (en) | 2020-08-10 | 2020-08-10 | Dust removal air duct of robot plasma groove cutting workbench |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212823553U (en) |
-
2020
- 2020-08-10 CN CN202021655049.8U patent/CN212823553U/en not_active Expired - Fee Related
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