CN113194634A - Communication engineering circuit board butt joint strutting arrangement that welds - Google Patents
Communication engineering circuit board butt joint strutting arrangement that welds Download PDFInfo
- Publication number
- CN113194634A CN113194634A CN202110367912.2A CN202110367912A CN113194634A CN 113194634 A CN113194634 A CN 113194634A CN 202110367912 A CN202110367912 A CN 202110367912A CN 113194634 A CN113194634 A CN 113194634A
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- China
- Prior art keywords
- circuit board
- butt joint
- fixedly connected
- groove
- telescopic
- Prior art date
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
- H05K3/365—Assembling flexible printed circuits with other printed circuits by abutting, i.e. without alloying process
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/01—Tools for processing; Objects used during processing
- H05K2203/0147—Carriers and holders
- H05K2203/0165—Holder for holding a Printed Circuit Board [PCB] during processing, e.g. during screen printing
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/15—Position of the PCB during processing
- H05K2203/1509—Horizontally held PCB
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- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a butt joint supporting device for welding a circuit board in communication engineering, which comprises a supporting plate, wherein two L-shaped plates which are symmetrically arranged are inserted in the supporting plate in a penetrating manner, the two L-shaped plates are fixedly connected with a butt joint platform together, and a sliding groove is arranged in the butt joint platform. After the circuit board is placed into the fixing groove, the telescopic spring is extruded to push the fixing pressing sheet to move downwards until the rubber pad abuts against the circuit board, so that the circuit board is fixed and clamped, the operation is simple and convenient, the stability of the circuit board in butt joint is greatly improved, the rotating rod is driven to rotate through the driving motor, the first bevel gear and the second bevel gear are meshed to rotate at the moment, the screw rod is driven to rotate to be matched with the ball nut to realize the lifting of the butt joint table until a proper butt joint position is reached, the effect of stably supporting the whole butt joint supporting device is achieved, and the accuracy in the circuit board butt joint process can be indirectly improved.
Description
Technical Field
The invention relates to the technical field of communication engineering, in particular to a butt joint supporting device for welding of a communication engineering circuit board.
Background
Communication engineering is an important branch of electronic engineering, and is one of the basic subjects, which pay attention to the principle and application of information transmission and signal processing in the communication process, and the communication engineering researches that information is transmitted from a transmitting end to one or more receiving ends through electric pulses in the form of electromagnetic waves, sound waves or light waves, whether the receiving ends can correctly identify the information or not, and depending on the loss in transmission, the signal processing is an important link in the communication engineering and comprises filtering, coding, decoding and the like. The flexible and rigid combined circuit board has the characteristics of high wiring density, light weight, thin thickness and good bending property, and therefore the flexible and rigid combined circuit board is a circuit board with FPC (flexible printed circuit) characteristics and PCB (printed circuit board) characteristics formed by combining a flexible circuit board and a rigid circuit board through processes of pressing and the like according to relevant process requirements.
At present, when the circuit board needs to be butted, a combination processing mode generally comprises groove splicing, glue bonding and hot melting connection, wherein the hot melting connection can be operated in a unified mode after the circuit board is completely spliced, a plurality of connecting and splicing points can be welded simultaneously, the combination efficiency of the circuit board is greatly improved, and the hot melting connection is generally applied to the processing and butting of the circuit board at present. However, most of the existing circuit board butt joint operations depend on manual butt joint, the accuracy in the welding process is low, and butt joint deviation is easy to occur, so that the levelness of two circuit boards is different, general clamping equipment is simple, the fixing operation of the circuit boards is not stable enough, and the using requirements of people cannot be well met.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides a butt joint supporting device for welding a communication engineering circuit board.
In order to achieve the purpose, the invention adopts the following technical scheme:
a butt joint supporting device for butt welding of communication engineering circuit boards comprises a supporting plate, wherein two L-shaped plates which are symmetrically arranged are inserted in the supporting plate in a penetrating mode, the two L-shaped plates are fixedly connected with a butt joint table together, a sliding groove is formed in the butt joint table, two mounting bases which are symmetrically arranged are connected in the sliding groove in a sliding mode, fixing grooves are formed in the two mounting bases, a fixing mechanism is arranged on each mounting base, a plurality of supporting columns are fixedly connected to the bottom wall of the supporting plate, a driving mechanism is arranged between the supporting columns, an outer frame is fixedly connected to the top wall of the supporting plate, a transverse plate is fixedly connected between the inner side wall of the outer frame, a telescopic cylinder is fixedly mounted on the top wall of the transverse plate, a mounting box which slides on the transverse plate is fixedly connected to the driving end of the telescopic cylinder, and an electric welding machine is fixedly mounted on the inner top wall of the mounting box, and the output end of the electric welding machine is fixedly connected with an electric welding head.
Preferably, a plurality of damping springs which are evenly distributed at intervals are fixedly connected between the inner walls of the two sides of the installation box and the outer walls of the two sides of the electric welding machine.
Preferably, the fixing mechanism comprises a connecting block fixedly connected to the top wall of the mounting base, each connecting block is internally provided with a telescopic groove, each telescopic groove is internally provided with a telescopic rod, each top wall of the telescopic rod is fixedly connected with a pulling plate, each telescopic rod is positioned in a telescopic groove and is fixedly connected with a fixing pressing sheet, and each fixing pressing sheet penetrates through the connecting block and extends to the outside of the connecting block and is fixedly bonded with a rubber pad.
Preferably, each fixed pressing piece is fixedly connected with an expansion spring between one end of the fixed pressing piece located in the expansion groove and the inner side wall of the expansion groove, and each expansion spring is sleeved on the outer wall of the expansion rod.
Preferably, fixed mounting has the connecting seat on the inside wall of spout, the connecting seat internal rotation is connected with the threaded rod, the other end fixedly connected with rotor plate of threaded rod, threaded connection has fixation nut on the outer wall of threaded rod, fixation nut's both sides outer wall all rotates and is connected with the linking arm, two the linking arm all runs through and extends to in the spout and rotate with the preceding lateral wall of mounting base and be connected.
Preferably, actuating mechanism includes the fixed plate of fixed mounting between a plurality of support columns, fixed mounting has driving motor on the fixed plate, establish in the fixed plate and construct the groove, driving motor's output fixedly connected with dwang, the dwang runs through and extends to mechanism inslot and fixed cover is equipped with first conical gear, the diapire of backup pad rotates and is connected with the lead screw, the lead screw runs through and extends to mechanism inslot and fixed cover is equipped with the second conical gear who meshes with first conical gear mutually.
Preferably, the outer wall of the screw rod is rotatably connected with ball nuts, and the bottom ends of the two L-shaped plates are fixedly connected with the outer walls of the two sides of the ball nuts respectively.
Preferably, the bottom wall fixed mounting of second bevel gear has the mount, it is connected with two gyro wheels to rotate on the mount, the inner bottom wall in mechanism groove is equipped with the rolling groove with gyro wheel size position assorted, two the gyro wheel all with the inner bottom wall roll connection in rolling groove.
Compared with the prior art, this communication engineering circuit board butt joint strutting arrangement's advantage lies in:
1. the driving motor drives the rotating rod to rotate, at the moment, the first bevel gear and the second bevel gear are meshed to rotate, the screw rod is driven to rotate to be matched with the ball nut to realize the lifting of the butt joint table until a proper butt joint position is reached, the whole butt joint supporting device is stably supported, and the accuracy in the circuit board welding process can be indirectly improved;
2. the rotating plate is screwed, the threaded rod rotates to be matched with the fixing nut to drive the two connecting arms to retract together, so that the two mounting bases are driven to horizontally move along the sliding groove and approach to each other, the horizontal positions of the circuit boards are adjusted by the mounting bases, the two mounting bases synchronously move in opposite directions, the levelness of the two circuit boards is ensured to be the same, and the accuracy of the circuit boards in butt welding is effectively improved;
3. after the circuit board is placed in the fixing groove, the telescopic spring is extruded to push the fixing pressing sheet to move downwards until the rubber pad abuts against the circuit board, so that the circuit board is fixed and clamped, the operation is simple and convenient, and the stability of the circuit board during butt welding is greatly improved;
in summary, after the circuit board is placed in the fixing groove, the telescopic spring is extruded to push the fixing pressing sheet to move downwards until the rubber pad abuts against the circuit board, so that the circuit board is fixed and clamped, the operation is simple and convenient, the stability of the circuit board during butt welding is greatly improved, the rotating rod is driven to rotate through the driving motor, the first bevel gear and the second bevel gear are meshed to rotate at the moment, the screw rod is driven to rotate to be matched with the ball nut to achieve lifting of the butt joint table until a proper butt joint position is reached, the effect of stably supporting the whole butt joint supporting device is achieved, and the accuracy of the circuit board in the butt welding process can be indirectly improved.
Drawings
Fig. 1 is a front cross-sectional view of a welding and butting support device for communication engineering circuit boards according to the present invention;
FIG. 2 is a side sectional view of a driving mechanism of a butt joint supporting device for welding a communication engineering circuit board according to the present invention;
fig. 3 is a cross-sectional view of a communication engineering circuit board welding butt joint supporting device in a top view;
FIG. 4 is an enlarged view of A in FIG. 1;
fig. 5 is an enlarged view of B in fig. 2.
In the figure: the welding machine comprises a supporting plate 1, a 2L-shaped plate, a 3 butt joint table, a 4 supporting column, a 5 outer frame, a 6 transverse plate, a 7 telescopic cylinder, an 8 installation box, a 9 electric welding machine, a 10 electric welding head, a 11 damping spring, a 12 fixing plate, a 13 driving motor, a 14 mechanism groove, a 15 rotating rod, a 16 first bevel gear, a 17 screw rod, an 18 second bevel gear, a 19 ball nut, a 20 sliding groove, a 21 connecting seat, a 22 threaded rod, a 23 rotating plate, a 24 fixing nut, a 25 connecting arm, a 26 installation base, a 27 fixing groove, a 28 connecting block, a 29 telescopic groove, a 30 telescopic rod, a 31 pull plate, a 32 fixing pressing sheet, a 33, a 34 telescopic spring, a 35 rubber pad fixing frame, a 36 roller and a 37 rolling groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a butt-jointing support device for welding a communication engineering circuit board, comprising a support plate 1, wherein two L-shaped boards 2 symmetrically arranged are inserted into the support plate 1, the two L-shaped boards 2 are fixedly connected with a butt-jointing table 3, a sliding chute 20 is arranged in the butt-jointing table 3, two mounting bases 26 symmetrically arranged with each other are slidably connected in the sliding chute 20, fixing grooves 27 are respectively arranged on the two mounting bases 26, a fixing mechanism is arranged on each mounting base 26, the fixing mechanism comprises a connecting block 28 fixedly connected on the top wall of the mounting base 26, a telescopic groove 29 is arranged in each connecting block 28, a telescopic rod 30 is slidably connected in each telescopic groove 29, a pulling plate 31 is fixedly connected on the top wall of each telescopic rod 30, a fixing pressing sheet 32 is fixedly connected on one end of each telescopic rod 30 positioned in the telescopic groove 29, each fixing pressing sheet 32 extends out of the connecting block 28 and is fixedly bonded with a rubber pad 33, an expansion spring 34 is fixedly connected between one end of each fixed pressing sheet 32 positioned in the expansion groove 29 and the inner side wall of the expansion groove 29, each expansion spring 34 is sleeved on the outer wall of the expansion rod 30, a connecting seat 21 is fixedly installed on the inner side wall of the sliding groove 20, a threaded rod 22 is rotatably connected with the connecting seat 21, the other end of the threaded rod 22 is fixedly connected with a rotating plate 23, a fixing nut 24 is connected with the outer wall of the threaded rod 22 in a threaded manner, connecting arms 25 are rotatably connected with the outer walls of two sides of the fixing nut 24, the two connecting arms 25 extend into the sliding groove 20 in a penetrating manner and are rotatably connected with the front side wall of the mounting base 26, after the circuit board is placed in the fixing groove 27, the expansion springs 34 are extruded to push the fixed pressing sheets 32 to move downwards until rubber pads 33 abut against the circuit board, so as to realize the fixed clamping of the circuit board, the operation is simpler and more convenient, and the stability of the circuit board during butt joint is greatly improved, twist and move rotor plate 23, threaded rod 22 rotates and cooperatees with fixation nut 24 and drives two linking arms 25 and retract together, and then drives two mounting base 26 and carry out horizontal migration and be close to each other along spout 20, relies on mounting base 26 to adjust the horizontal position of circuit board to realize the synchronous relative movement of two mounting base 26, ensure that the levelness of two circuit boards is the same, effectively promote the precision of circuit board when the butt joint.
The bottom wall of the supporting plate 1 is fixedly connected with a plurality of supporting columns 4, a driving mechanism is arranged among the supporting columns 4, the driving mechanism comprises a fixing plate 12 fixedly installed among the supporting columns 4, a driving motor 13 is fixedly installed on the fixing plate 12, a mechanism groove 14 is formed in the fixing plate 12, an output end of the driving motor 13 is fixedly connected with a rotating rod 15, the rotating rod 15 penetrates into the mechanism groove 14 and is fixedly sleeved with a first bevel gear 16, the bottom wall of the supporting plate 1 is rotatably connected with a screw rod 17, the screw rod 17 penetrates into the mechanism groove 14 and is fixedly sleeved with a second bevel gear 18 meshed with the first bevel gear 16, the outer wall of the screw rod 17 is rotatably connected with ball nuts 19, the bottom ends of the two L-shaped plates 2 are respectively and fixedly connected with the outer walls of two sides of the ball nuts 19, the driving motor 13 drives the rotating rod 15 to rotate, at the moment, the first bevel gear 16 is meshed with the second bevel gear 18 to rotate, the screw rod 17 is driven to rotate to be matched with the ball nut 19 to realize the lifting of the butt joint platform 3 until a proper butt joint position is reached, so that the whole butt joint supporting device is stably supported, and the accuracy in the welding process of the circuit board can be indirectly improved.
The bottom wall of the second bevel gear 18 is fixedly provided with a fixed frame 35, the fixed frame 35 is rotatably connected with two rollers 36, the inner bottom wall of the mechanism groove 14 is provided with a rolling groove 37 matched with the size and the position of the roller 36, and the two rollers 36 are both in rolling connection with the inner bottom wall of the rolling groove 37.
The top wall of the supporting plate 1 is fixedly connected with an outer frame 5, a transverse plate 6 is fixedly connected between the inner side walls of the outer frame 5, a telescopic cylinder 7 is fixedly arranged on the top wall of the transverse plate 6, a mounting box 8 which slides on the transverse plate 6 is fixedly connected with the driving end of the telescopic cylinder 7, an electric welding machine 9 is fixedly arranged on the inner top wall of the mounting box 8, an electric welding head 10 is fixedly connected with the output end of the electric welding machine 9, a plurality of damping springs 11 which are uniformly and alternately distributed are fixedly connected between the inner walls at two sides of the mounting box 8 and the outer walls at two sides of the electric welding machine 9, the driving end of the telescopic cylinder 7 pushes the mounting box 8 to move, further moving the electric welding machine 9, realizing the position adjustment of the electric welding head 10, ensuring the precision of the butt joint of the circuit board, and set up damping spring 11 and can cushion the shock attenuation to the vibrations that electric welding 9 produced at the during operation, effectively reduced the influence that causes the butt fusion.
Further, unless otherwise specifically stated or limited, the above-described fixed connection is to be understood in a broad sense, and may be, for example, welded, glued, or integrally formed as is conventional in the art.
The operating principle of the present invention is now explained as follows:
after the circuit board is placed into the fixing groove 27, the expansion spring 34 is squeezed to push the fixing pressing sheet 32 to move downwards until the rubber pad 33 abuts against the circuit board, so that the circuit board is fixed and clamped, the operation is simple and convenient, the stability of the circuit board in butt joint is greatly improved, the rotating plate 23 is twisted, the threaded rod 22 rotates to be matched with the fixing nut 24 to drive the two connecting arms 25 to retract together, the two mounting bases 26 are driven to horizontally move along the sliding groove 20 and approach each other, the horizontal position of the circuit board is adjusted by the mounting bases 26, so that the two mounting bases 26 synchronously move in opposite directions, the levelness of the two circuit boards is ensured to be the same, the accuracy of the circuit board in butt joint is effectively improved, then the driving motor 13 drives the rotating rod 15 to rotate, and at the moment, the first bevel gear 16 is meshed with the second bevel gear 18 to rotate, the screw rod 17 is driven to rotate to be matched with the ball nut 19 to realize the lifting of the butt joint platform 3 until a proper butt joint position is reached, so that the whole butt joint supporting device is stably supported, and the accuracy in the welding process of the circuit board can be indirectly improved.
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 able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (8)
1. The utility model provides a butt joint strutting arrangement of communication engineering circuit board butt joint, includes backup pad (1), its characterized in that, run through on backup pad (1) and insert and be equipped with two symmetry L templates (2) of establishing mutually, two the common fixedly connected with of L template (2) docks platform (3), be equipped with spout (20) in docks platform (3), sliding connection has two mounting bases (26) that mutual symmetry set up in spout (20), two all be equipped with fixed slot (27) on mounting base (26), every all be equipped with fixed establishment on mounting base (26), the diapire fixedly connected with of backup pad (1) has a plurality of support columns (4), is a plurality of be equipped with actuating mechanism between support column (4), the roof fixedly connected with outer frame (5) of backup pad (1), fixedly connected with diaphragm (6) between the inside wall of outer frame (5), roof fixed mounting of diaphragm (6) has telescopic cylinder (7), the drive end fixedly connected with of telescopic cylinder (7) slides install bin (8) on diaphragm (6), the interior roof fixed mounting of install bin (8) has electric welding (9), output fixedly connected with electric welding head (10) of electric welding (9).
2. The butt joint supporting device for the communication engineering circuit board welding according to claim 1, wherein a plurality of damping springs (11) are fixedly connected between the inner walls of the two sides of the installation box (8) and the outer walls of the two sides of the electric welding machine (9) and are uniformly and alternately distributed.
3. The butt-joint support device for the communication engineering circuit board welding according to claim 1, wherein the fixing mechanism comprises connecting blocks (28) fixedly connected to the top wall of the mounting base (26), each connecting block (28) is provided with a telescopic groove (29), each telescopic groove (29) is provided with a telescopic rod (30) in a sliding connection manner, the top wall of each telescopic rod (30) is fixedly connected with a pulling plate (31), one end of each telescopic rod (30) located in the telescopic groove (29) is fixedly connected with a fixing pressing sheet (32), and each fixing pressing sheet (32) extends out of the connecting block (28) in a penetrating manner and is fixedly bonded with a rubber pad (33).
4. The butt-jointed supporting device for the communication engineering circuit board in the fusion splicing manner as claimed in claim 3, wherein a telescopic spring (34) is fixedly connected between one end of each fixing pressing piece (32) located in the telescopic groove (29) and the inner side wall of the telescopic groove (29), and each telescopic spring (34) is sleeved on the outer wall of the telescopic rod (30).
5. The butt joint supporting device for the communication engineering circuit board welding according to claim 1, wherein a connecting seat (21) is fixedly installed on an inner side wall of the sliding groove (20), a threaded rod (22) is rotatably connected to the connecting seat (21), a rotating plate (23) is fixedly connected to the other end of the threaded rod (22), a fixing nut (24) is rotatably connected to an outer wall of the threaded rod (22), connecting arms (25) are rotatably connected to outer walls of two sides of the fixing nut (24), and the two connecting arms (25) extend into the sliding groove (20) and are rotatably connected with a front side wall of the installation base (26).
6. The butt joint supporting device for the welding of the communication engineering circuit board according to claim 1, wherein the driving mechanism comprises a fixing plate (12) fixedly installed among a plurality of supporting columns (4), a driving motor (13) is fixedly installed on the fixing plate (12), a mechanism groove (14) is formed in the fixing plate (12), an output end of the driving motor (13) is fixedly connected with a rotating rod (15), the rotating rod (15) penetrates through the mechanism groove (14) and is fixedly sleeved with a first bevel gear (16), the bottom wall of the supporting plate (1) is rotatably connected with a lead screw (17), and the lead screw (17) penetrates through the mechanism groove (14) and is fixedly sleeved with a second bevel gear (18) meshed with the first bevel gear (16).
7. The butt-joint supporting device for the communication engineering circuit board welding according to claim 6, wherein a ball nut (19) is rotatably connected to the outer wall of the screw rod (17), and the bottom ends of the two L-shaped plates (2) are fixedly connected with the outer walls of two sides of the ball nut (19) respectively.
8. The butt-joint supporting device for the welding of communication engineering circuit boards according to claim 6, wherein a fixing frame (35) is fixedly mounted on the bottom wall of the second bevel gear (18), two rollers (36) are rotatably connected to the fixing frame (35), a rolling groove (37) matched with the size and position of the roller (36) is formed in the inner bottom wall of the mechanism groove (14), and both rollers (36) are in rolling connection with the inner bottom wall of the rolling groove (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110367912.2A CN113194634A (en) | 2021-04-06 | 2021-04-06 | Communication engineering circuit board butt joint strutting arrangement that welds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110367912.2A CN113194634A (en) | 2021-04-06 | 2021-04-06 | Communication engineering circuit board butt joint strutting arrangement that welds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113194634A true CN113194634A (en) | 2021-07-30 |
Family
ID=76974984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110367912.2A Withdrawn CN113194634A (en) | 2021-04-06 | 2021-04-06 | Communication engineering circuit board butt joint strutting arrangement that welds |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113194634A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815927A (en) * | 2022-12-09 | 2023-03-21 | 吉林化工学院 | Welding set of electromechanical maintenance |
-
2021
- 2021-04-06 CN CN202110367912.2A patent/CN113194634A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815927A (en) * | 2022-12-09 | 2023-03-21 | 吉林化工学院 | Welding set of electromechanical maintenance |
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Application publication date: 20210730 |
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