CN114814484A - Fault arc detection method - Google Patents
Fault arc detection method Download PDFInfo
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- CN114814484A CN114814484A CN202210330653.0A CN202210330653A CN114814484A CN 114814484 A CN114814484 A CN 114814484A CN 202210330653 A CN202210330653 A CN 202210330653A CN 114814484 A CN114814484 A CN 114814484A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- Locating Faults (AREA)
Abstract
本发明公开了一种故障电弧的检测方法，包括以下步骤：S1：先在检测设备上输入被检测设备的安全电流；S2：然后再通过连接线和连接机构将检测设备和被检测设备进行连接；S3：对接好之后检测设备就会实时对被检测设备的电流进行监测；S4：监测到的电流通过数据处理器与输入的安全电流进行检测；S5：若监测到的电流在安全电流内则继续监测，同时再把监测到的数据进行记录，本发明通过在检测设备上输入被检测设备的安全电流，然后再与被检测设备进行对接，来检测当前被检测设备的电流与设定的安全电流进行对比，若检测到的电流不在安全电流的范围内则检测出被检测设备出现故障并进行报警。
The invention discloses a detection method for arc fault, comprising the following steps: S1: firstly input the safety current of the detected device on the detection device; S2: then connect the detection device and the detected device through a connecting wire and a connecting mechanism ; S3: After the connection is completed, the detection device will monitor the current of the detected device in real time; S4: The monitored current is detected by the data processor and the input safe current; S5: If the monitored current is within the safe current, then Continue to monitor and record the monitored data at the same time. The present invention detects the current of the tested device and the set safety by inputting the safety current of the tested device on the testing device, and then docking with the tested device. The current is compared, and if the detected current is not within the safe current range, the detected equipment is detected to be faulty and an alarm is issued.
Description
Technical Field
The invention relates to the technical field of arc detection, in particular to a method for detecting a fault arc.
Background
Fault arcing is a random physical phenomenon that can be described mathematically statistically, also known as "gas ionization". The pressure, radiation, and arcing effects from a fault arc can cause serious damage to the equipment, while the high temperature, high pressure gases are hot from the arcing effects and can cause fire. Therefore, the study of the fault arc, especially the study of the fault arc detection method, is very important.
The existing electronic Arc Fault Circuit Interrupter (AFCI) on the market needs to store all the electrical characteristics (rassa technology, AFCI detection principle) to determine whether it is a fault arc. The circuit load conditions are different, and statistics of all the electrical appliance conditions is difficult to achieve, so a fault arc detection method is provided for solving the problems.
Disclosure of Invention
The invention provides a method for detecting a fault arc, which is based on the technical problem that all motors cannot be detected in the background art.
The invention provides a method for detecting a fault arc, which comprises the following steps:
s1: firstly, setting a current threshold value for detection equipment;
s2: then, the detection equipment is connected with the detected equipment through a connecting wire and a connecting mechanism;
s3: after the detection equipment is in butt joint with the detected equipment, the detection equipment can monitor the current of the detected equipment in real time;
s4: comparing the monitored current data with a preset current threshold value through a data processor;
s5: if the monitored current is between the set current thresholds, continuing monitoring, simultaneously recording the monitored data, and if the monitored current is not between the set current thresholds, generating a fault;
s6: when a fault occurs, the data processor sequentially starts an internal alarm and an external alarm;
s7: when a fault is monitored, disconnecting the detected equipment;
s8: resetting is selected, and the resetting can be performed on an internal alarm and an external alarm or on disconnection of detected equipment;
s9: after the detected device is replaced, only the current threshold needs to be input again.
Preferably, the connecting mechanism comprises a joint, a fixing frame, an upper fixture, a button, a push rod, a rack, a lower fixture, a first support frame, a second support frame, a toothed ring, a hollow gear, a positioning gear, a torsion spring, a positioning rod, a positioning spring, a matching block, a matching rod and a meshing rod, the fixing frame is fixedly arranged on the joint, the second support frame is fixedly arranged on the front side and the rear side of the bottom of the upper fixture, the first support frame is fixedly arranged on the front side and the rear side of the top of the lower fixture, the hollow gear is fixedly arranged on the front side and the rear side of the second support frame, the two first support frames are rotatably connected with the hollow gear, the positioning gear is fixedly arranged on the front side and the rear side of the two first support frames, the two first support frames are rotatably connected with the front side and the rear side of the fixing frame respectively, and the torsion spring is fixedly arranged on the two second support frames, the two ends of the torsion spring are respectively fixedly connected with the upper clamp and the lower clamp, the rack is slidably connected with the front side of the upper clamp, the right end of the rack is rotatably connected with the left end of the push rod, the left end of the push rod is rotatably connected with the button, the button is slidably connected with the front side of the upper clamp, the engaging rod is slidably connected with the front side of the fixing frame, the front side of the engaging rod is fixedly provided with a positioning rod, the right end of the engaging rod is engaged with the hollow gear, the right end of the positioning rod is engaged with the positioning gear, the toothed ring is rotatably connected with the front side of the positioning gear, the toothed ring is engaged with the rack, the left ends of the engaging rod and the positioning rod are fixedly provided with the same positioning spring, the left end of the positioning spring is fixedly arranged on the fixing frame, the matching block is fixedly arranged on the positioning rod, and the matching rod is fixedly arranged on the inner side of the toothed ring, the matching block is matched with the matching rod, and the connecting mechanism is used for connecting the connector and the detected equipment more stably.
Preferably, an upper limit current and a lower limit current may be input in the step S1 for more precise detection of the fault arc.
Preferably, the selection in the step S8 is reset, the internal alarm and the external alarm can be optionally reset in the fault repairing, and the detection device is reset after the detection device is repaired.
Preferably, a triangular groove is formed in the matching block, the top of the right side of the matching rod is of a triangular structure, the top of the right side of the matching rod is in sliding contact with the inner wall of the triangular groove, the matching block can be pulled when the matching rod enters the matching block, and the matching block pulls the positioning rod and the meshing rod to unlock the positioning gear and the hollow gear.
Preferably, a return spring is fixedly mounted at the left end of the rack, and the left end of the return spring is fixedly mounted on the upper clamp and used for returning the rack.
Preferably, a horizontal sliding groove and a vertical sliding groove are respectively formed in the front side of the upper clamp, the rear side of the rack is in sliding connection with the inner wall of the horizontal sliding groove, and the rear side of the button is in sliding connection with the inner wall of the vertical sliding groove, so that the push rod can be pushed when the button is pressed, and then the push rod pushes the rack to drive the toothed ring to rotate.
The invention has the beneficial effects that:
the push button is pressed on the upper clamp, the push button pushes the push rod, the push rod pushes the rack to move towards and compress the return spring, the rack can drive the gear to rotate, the gear ring rotates to drive the matching rod to be inserted into the matching block, the matching rod pulls the matching block, the matching block pulls the positioning rod and the meshing rod to be separated from the hollow gear and the positioning gear respectively, the upper clamp and the lower clamp can rotate freely, and the connecting mechanism is released from positioning;
the left sides of the upper clamp and the lower clamp are opened by pressing the right sides of the upper clamp and the lower clamp, the rack can be driven to rotate while the upper clamp rotates on the fixing frame, the circle centers of the rack and the toothed ring are located at the same position, so that the toothed ring cannot be released when the rack rotates, the circuit board at the detection position of the detected equipment can be clamped by the upper clamp and the lower clamp through the resetting of the torsion spring, and the joint is inserted into the circuit board at the moment, so that the butt joint of the detected equipment and the detected equipment is realized;
by loosening the upper clamp and the lower clamp, the rack is reset through the reset spring, the meshing rod and the positioning rod are reset through the positioning spring to be meshed with the hollow gear and the positioning gear again, the hollow gear and the positioning gear are positioned, meanwhile, the positions of the upper clamp and the lower clamp are also positioned, and better fixation is realized;
the detection of any electric appliance fault arc is realized by setting the safety circuit of the detected equipment, monitoring and comparing the current of the detected equipment,
according to the invention, the safety current of the detected device is input into the detection device, and then the detection device is in butt joint with the detected device, so that the current of the detected device is detected and compared with the set safety current, and if the detected current is not in the range of the safety current, the detected device is detected to have a fault and an alarm is given.
Drawings
FIG. 1 is a flow chart of a method for detecting a fault arc according to the present invention;
FIG. 2 is a schematic diagram of the connection between the detection device and the detected device in the method for detecting a fault arc according to the present invention;
FIG. 3 is a top view of a structural joint for a method of detecting a fault arc in accordance with the present invention;
FIG. 4 is a front view of a structural joint for a method of detecting a fault arc in accordance with the present invention;
FIG. 5 is a top view of a structure positioning rod and a meshing rod of the method for detecting a fault arc according to the present invention;
FIG. 6 is a schematic diagram of the connection between the structural hollow gear, the positioning gear and the torsion spring according to the method for detecting a fault arc of the present invention;
FIG. 7 is an enlarged schematic view of a structure A of a method for detecting a fault arc according to the present invention;
fig. 8 is a front view of a structural jig according to a method for detecting a fault arc according to the present invention.
In the figure: the device comprises a detection device 1, an internal alarm 2, a connecting line 3, a detected device 4, an external alarm 5, an engaging rod 6, a matching rod 7, a joint 8, a fixing frame 9, an upper clamp 10, a button 11, a push rod 12, a rack 13, a lower clamp 14, a first support frame 15, a second support frame 16, a toothed ring 17, a return spring 18, a hollow gear 19, a positioning gear 20, a torsion spring 21, a positioning rod 22, a positioning spring 23, a matching block 24, a triangular groove 25, a horizontal sliding groove 26 and a vertical sliding groove 27.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Examples
Referring to fig. 1-8, the present embodiment provides a superhard composite coated cutting tool, comprising the steps of:
s1: firstly, setting a current threshold value in the detection equipment 1;
s2: then the detection device 1 is connected with the detected device 4 through the connecting wire 3 and the connecting mechanism;
s3: after the detection device 1 is well butted with the detected device 4, the detection device 1 can monitor the current of the detected device 4 in real time;
s4: comparing the monitored current data with a preset current threshold value through a data processor;
s5: if the monitored current is between the set current thresholds, continuing monitoring, simultaneously recording the monitored data, and if the monitored current is not between the set current thresholds, generating a fault;
s6: when a fault occurs, the data processor sequentially starts the internal alarm 2 and the external alarm 5;
s7: when the fault is monitored, the detected equipment 4 is disconnected;
s8: resetting is selected, and the resetting can be selected for resetting the internal alarm 5 and the external alarm 5 or the disconnection of the detected equipment 5;
s9: after the detected device 4 is replaced, only the current threshold needs to be input again.
The connecting mechanism comprises a joint 8, a fixing frame 9, an upper clamp 10, a button 11, a push rod 12, a rack 13, a lower clamp 14, a first support frame 15, a second support frame 16, a toothed ring 17, a hollow gear 19, a positioning gear 20, a torsion spring 21, a positioning rod 22, a positioning spring 23, a matching block 24, a matching rod 7 and a meshing rod 6, wherein the fixing frame 9 is fixedly arranged on the joint 8, the front side and the rear side of the bottom of the upper clamp 10 are fixedly provided with the second support frame 16, the front side and the rear side of the top of the lower clamp 14 are fixedly provided with the first support frame 15, the front side and the rear side of the second support frame 16 are fixedly provided with the hollow gear 19, the two first support frames 15 are rotatably connected with the hollow gear 19, the front side and the rear side of the two first support frames 15 are fixedly provided with the positioning gear 20, the two first support frames 15 are respectively rotatably connected with the front side and the rear side of the fixing frame 9, two second supporting frames 16 are fixedly provided with torsion springs 21, two ends of each torsion spring 21 are respectively fixedly connected with an upper clamp 10 and a lower clamp 14, a rack 13 is slidably connected with the front side of the upper clamp 10, the right end of the rack 13 is rotatably connected with the left end of a push rod 12, the left end of the push rod 12 is rotatably connected with a button 11, the button 11 is slidably connected with the front side of the upper clamp 10, a meshing rod 6 is slidably connected with the front side of a fixing frame 9, the front side of the meshing rod 6 is fixedly provided with a positioning rod 22, the right end of the meshing rod 6 is meshed with a hollow gear 19, the right end of the positioning rod 22 is meshed with a positioning gear 20, a toothed ring 17 is rotatably connected with the front side of the positioning gear 20, the toothed ring 17 is meshed with the rack 13, the left ends of the meshing rod 6 and the positioning rod 22 are fixedly provided with the same positioning spring 23, the left end of the positioning spring 23 is fixedly arranged on the fixing frame 9, a matching block 24 is fixedly arranged on the positioning rod 22, the matching rod 7 is fixedly arranged on the inner side of the toothed ring 17, the matching block 24 is matched with the matching rod 7, the connecting mechanism is used for enabling the connector 8 to be connected with the detected equipment 4 more stably, the data processor is a CPU, the detected equipment 4 can be any one electric appliance and can be used for detecting any electric appliance, an upper limit current and a lower limit current can be input in the step S1 and used for detecting fault arcs more accurately, the step S8 is selected to reset, the internal alarm 2 and the external alarm 5 can be selectively reset in fault repair, the detection equipment 1 is reset after the detected equipment 4 is repaired, the internal alarm 2 and the external alarm 5 can be stopped firstly when the detected equipment 4 is repaired so as to repair the detected equipment 4, the matching block 24 is provided with a triangular groove 25, the top of the right side of the matching rod 7 is of a triangular structure, and the top of the right side of the matching rod 7 is in sliding contact with the inner wall of the triangular groove 25, so that cooperation pole 7 can pull cooperation piece 24 when entering into cooperation piece 24, cooperation piece 24 pulls locating lever 22 and meshing pole 6 again and unlocks positioning gear 20 and hollow gear 19, the left end fixed mounting of rack 13 has reset spring 18, the left end fixed mounting of reset spring 18 is on last anchor clamps 10, be used for resetting to rack 13, the front side of going up anchor clamps 10 is seted up horizontal spout 26 and perpendicular spout 27 respectively, the rear side of rack 13 and the inner wall sliding connection of horizontal spout 26, the rear side of button 11 and the inner wall sliding connection of perpendicular spout 27, make button 11 can promote catch bar 12 when being pressed, catch bar 12 promotes rack 13 again and drives the ring gear 17 rotation.
The working principle is as follows: firstly inputting the safe current of the detected device 4 on the detecting device 1, then connecting with the detected device 4 through the connecting wire 3, the joint 8 and the connecting mechanism, when the connecting mechanism is used, firstly, the button 11 is pressed on the upper clamp 10, the button 11 pushes the push rod 12 downwards, the push rod 12 pushes the rack 13 to move towards the left side and compresses the return spring 18, at this time, the rack 13 is meshed with the toothed ring 17, the rack 13 can drive the gear to rotate, the toothed ring 17 rotates to drive the matching rod 7 to be inserted into the matching block 24, the matching block 24 is pulled towards the left side by the matching rod 7, the matching block 24 pulls the positioning rod 22 and the meshing rod 6 to be separated from the hollow gear 19 and the positioning gear 20 respectively, at this time, the hollow gear 19 and the positioning gear 20 can rotate freely, and simultaneously, the upper clamp 10 and the lower clamp 14 can rotate freely, by pressing the right sides of the upper clamp 10 and the lower clamp 14, the left sides of the upper clamp 10 and the lower clamp 14 are opened, the rack 13 is driven to rotate while the upper clamp 10 rotates on the fixing frame 9, the circle centers of the rack 13 and the toothed ring 17 are at one position, so the toothed ring 17 cannot be released when the rack 13 rotates, the circuit board at the detection position of the detected device 4 can be clamped by the upper clamp 10 and the lower clamp 14 through the resetting of the torsion spring 21, the joint 8 is inserted into the circuit board at the moment, the butt joint of the detected device 1 and the detected device 4 is realized, at the moment, the upper clamp 10 and the lower clamp 14 are released, the rack 13 is reset through the resetting spring 18, the meshing rod 6 and the positioning rod 22 are reset through the positioning spring 23 to re-mesh the hollow gear 19 and the positioning gear 20, the hollow gear 19 and the positioning gear 20 are positioned, and the positions of the upper clamp 10 and the lower clamp 14 are also positioned, so that better fixation is realized, after the butt joint, the detection device 1 will monitor the current of the detected device 4 in real time, the monitored current is detected with the input safety current through the data processor, if the monitored current is in the safety current, the monitoring is continued, and simultaneously, the monitored data is recorded, if the monitored current is not between the input safe currents, when a fault occurs, the data processor restarts the internal alarm 2, the internal alarm 2 restarts the external alarm 5, the detected equipment 4 is disconnected and reset when the fault is detected, the internal alarm 2 and the external alarm 5 can be selectively reset in fault repair to stop the internal alarm 2 and the external alarm 5, the detection device 1 is reset after the detected device 4 is repaired, the detection device 1 resets the detected device 4, and only the safety current needs to be input again after the detected device 4 is replaced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A method of detecting a fault arc, comprising the steps of:
s1: firstly, setting a current threshold value in detection equipment (1);
s2: then, the detection equipment (1) is connected with the detected equipment (4) through a connecting wire (3) and a connecting mechanism;
s3: after the detection equipment (1) is well butted with the detected equipment (4), the detection equipment (1) can monitor the current of the detected equipment (4) in real time;
s4: comparing the monitored current data with a preset current threshold value through a data processor;
s5: if the monitored current is between the set current thresholds, continuing monitoring, simultaneously recording the monitored data, and if the monitored current is not between the set current thresholds, generating a fault;
s6: when a fault occurs, the data processor sequentially starts the internal alarm (2) and the external alarm (5);
s7: when the fault is monitored, the detected equipment (4) is disconnected;
s8: resetting is selected, and disconnection of the internal alarm (2) and the external alarm (5) or the detected equipment (4) can be reset;
s9: after the detected device (4) is replaced, only the current threshold value needs to be input again.
2. The method for detecting the fault arc according to claim 1, wherein the connecting mechanism comprises a joint (8), a fixing frame (9), an upper clamp (10), a button (11), a push rod (12), a rack (13), a lower clamp (14), a first support frame (15), a second support frame (16), a toothed ring (17), a hollow gear (19), a positioning gear (20), a torsion spring (21), a positioning rod (22), a positioning spring (23), a matching block (24), a matching rod (7) and a meshing rod (6), the fixing frame (9) is fixedly installed on the joint (8), the second support frame (16) is fixedly installed on the front side and the rear side of the bottom of the upper clamp (10), the first support frame (15) is fixedly installed on the front side and the rear side of the top of the lower clamp (14), the hollow gear (19) is fixedly installed on the front side and the rear side of the second support frame (16), two first support frames (15) are rotatably connected with a hollow gear (19), positioning gears (20) are fixedly mounted on the front sides and the rear sides of the two first support frames (15), the two first support frames (15) are respectively rotatably connected on the front sides and the rear sides of the fixing frames (9), torsion springs (21) are fixedly mounted on the two second support frames (16), two ends of each torsion spring (21) are respectively fixedly connected with an upper clamp (10) and a lower clamp (14), a rack (13) is slidably connected on the front sides of the upper clamps (10), the right end of the rack (13) is rotatably connected with the left end of a push rod (12), the left end of the push rod (12) is rotatably connected with a button (11), the button (11) is slidably connected on the front sides of the upper clamps (10), an engaging rod (6) is slidably connected on the front sides of the fixing frames (9), and a positioning rod (22) is fixedly mounted on the front sides of the engaging rod (6), the right-hand member of meshing pole (6) meshes with hollow gear (19) mutually, the right-hand member and positioning gear (20) of locating lever (22) mesh mutually, ring gear (17) rotate to be connected in the front side of positioning gear (20), ring gear (17) mesh with rack (13) mutually, the left end fixed mounting of meshing pole (6) and locating lever (22) has same positioning spring (23), the left end fixed mounting of positioning spring (23) is on mount (9), cooperation piece (24) fixed mounting is on locating lever (22), cooperation pole (7) fixed mounting is in the inboard of ring gear (17), cooperation piece (24) cooperate with cooperation pole (7).
3. The method as claimed in claim 1, wherein the current threshold in step S1 is inputted with an upper limit current and a lower limit current.
4. A method for detecting a fault arc according to claim 1, characterized in that the step S8 is selected to reset, the internal alarm (2) and the external alarm (5) are selected to reset during fault repair, and the detection device (1) is reset after the device (4) to be detected is repaired.
5. The method for detecting the fault arc according to claim 2, wherein a triangular groove (25) is formed in the matching block (24), the top of the right side of the matching rod (7) is of a triangular structure, and the top of the right side of the matching rod (7) is in sliding contact with the inner wall of the triangular groove (25).
6. A method as claimed in claim 2, characterized in that a return spring (18) is fixedly mounted at the left end of the rack (13), and the left end of the return spring (18) is fixedly mounted on the upper fixture (10).
7. A method as claimed in claim 2, characterized in that the front side of the upper clamp (10) is provided with a horizontal sliding groove (26) and a vertical sliding groove (27), respectively, the rear side of the rack (13) is connected with the inner wall of the horizontal sliding groove (26) in a sliding manner, and the rear side of the button (11) is connected with the inner wall of the vertical sliding groove (27) in a sliding manner.
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| CN202210330653.0A CN114814484A (en) | 2022-03-30 | 2022-03-30 | Fault arc detection method |
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| CN202210330653.0A CN114814484A (en) | 2022-03-30 | 2022-03-30 | Fault arc detection method |
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| WO1998035237A2 (en) * | 1997-01-24 | 1998-08-13 | Square D Company | Arcing fault detection system |
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| CN212723188U (en) * | 2020-07-06 | 2021-03-16 | 南京长江都市建筑设计股份有限公司 | Arc fault monitoring device |
| CN213947768U (en) * | 2020-11-12 | 2021-08-13 | 唐山云海花纸有限公司 | Net clip structure of net stretching machine for ceramic stained paper production |
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