CN113427174A - Full-automatic welding system for snow sweeper housing - Google Patents
Full-automatic welding system for snow sweeper housing Download PDFInfo
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- CN113427174A CN113427174A CN202110683349.XA CN202110683349A CN113427174A CN 113427174 A CN113427174 A CN 113427174A CN 202110683349 A CN202110683349 A CN 202110683349A CN 113427174 A CN113427174 A CN 113427174A
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- welding
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- snowplow
- rotating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
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- Optics & Photonics (AREA)
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- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to the technical field of welding devices, and particularly relates to a full-automatic welding system for a snowplow casing. The invention provides a snow sweeper hood shell full-automatic welding system aiming at the problems that a pipeline type operation field occupies a large area and comprehensive production benefit is low in the prior art, the snow sweeper hood shell full-automatic welding system comprises a welding device for welding workpieces and a rotating station, a welding space for installing the workpieces is arranged on the rotating station, the rotating station is installed on a base, a driving assembly installed on the base is in driving connection with the rotating station, and the rotating station is rotated to enable the welding space to move close to or far away from the welding device. The invention utilizes the rotary station to install the workpiece and drives the workpiece to move so as to automatically complete welding, has higher automation degree, and can improve the effective utilization degree of the field and the comprehensive production benefit compared with the assembly line operation in a mode of rotating to complete welding.
Description
Technical Field
The invention belongs to the technical field of welding devices, and particularly relates to a full-automatic welding system for a snowplow casing.
Background
Welding, also known as fusion welding, is a manufacturing process and technique for joining metals or other thermoplastic materials, such as plastics, by means of heat, high temperature or high pressure. In the prior art, the welding process is mostly finished by manual welding or assembly line type operation, the automation degree of manual welding is low, and the production efficiency is low. The assembly line type operation site occupies a larger area, and the comprehensive production benefit is lower.
For example, the chinese patent of invention discloses an automatic welding line [ application number: 201910024457.9], the invention comprises a frame assembly, a feeding conveyer arranged on the frame assembly, an input device arranged at the output end of the feeding conveyer, a main conveyer belt arranged at one side of the input device, and a tin dispensing device, a precooling device, a shooting device, a soldering device, a cooling device, a trimming device and a discharging device which are arranged on the main conveyer belt in sequence; at least three working manipulators for clamping electrical components are arranged on one side of the main conveyor belt.
The invention has the advantages of reasonable design, compact structure and convenient use, but the adopted action mode of the invention is not in a production line type, so the problems are not solved.
Disclosure of Invention
The invention aims to solve the problems and provides a full-automatic welding system for a snowplow casing, which has high automation degree and saves the field.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a snow sweeper bonnet shell full-automatic welding system, is including the welding set who is used for welding workpiece, still includes rotatory station, be equipped with the welding space that is used for installing the work piece on the rotatory station, rotatory station installs on the base, installs drive assembly and rotatory station drive connection on the base, rotates rotatory station and can make the welding space take place to be close to or keep away from welding set's removal.
In the full-automatic welding system for the snowplow casing, the welding device comprises a welding robot and a welding gun connected to the end of the welding robot, the welding device and the welding space are respectively provided with a plurality of welding devices, and the welding space is at least one more than the welding device.
In foretell snowplow casing full-automatic welding system, still include the welding dust removal room that has the dust removal space inside, welding set is located the dust removal space, still is equipped with the dust removal pipeline on the welding dust removal room, dust removal pipeline one end is linked together with the aspiration pump, and the other end is linked together with the dust removal pipeline.
In the fully automatic welding system for the snowplow casing, the rotary station is partially positioned in the dust removal space, and the rotary station is rotated to enable the welding space to enter or separate from the dust removal space.
In foretell full-automatic welding system of snowplow casing, rotatory station includes the rotary disk of being connected with the drive assembly drive, the welding space is located and separates through the baffle between rotary disk top and two adjacent welding spaces, baffle fixed connection is on the rotary disk, still be equipped with the welded fastening subassembly that is used for fixed work piece on the rotary disk, the welded fastening subassembly be located the welding space and with the welding space one-to-one setting.
In foretell full-automatic welding system of snowplow casing, the welded fastening subassembly has the fixed bowl of operation cavity including inside, and fixed bowl slope sets up, the fixed bowl bottom is the arc and one side that the fixed bowl is close to the rotary disk border has the opening, the opening is linked together with the operation cavity, the fixed bowl bottom surface still is equipped with the mounting groove of border shape and work piece border shape looks adaptation, the mounting groove is linked together with the operation cavity.
In foretell snowplow casing full-automatic welding system, the welded fastening subassembly still includes fixed connection and is located the support of fixed bowl both sides on the rotary disk, be equipped with die clamping cylinder on the support, the grip block is connected on die clamping cylinder, the one end that die clamping cylinder was kept away from to the grip block is equipped with a plurality of electro-magnets, removes the grip block and can make the electro-magnet laminating on the side of fixed bowl.
In foretell full-automatic welding system of snowplow casing, the welded fastening subassembly still includes the spacing cylinder of fixed connection on the rotary disk, be connected with the limiting plate on the output shaft of spacing cylinder, remove the limiting plate and can make the limiting plate press to establish on the lower extreme border of fixed bowl.
In the full-automatic welding system for the snowplow casing, the rotary station is further provided with an ejection mechanism for ejecting the workpiece, the ejection mechanism comprises an installation plate fixedly connected to the rotary disk or the welding and fixing assembly, the installation plate is provided with an ejection cylinder, the elastic ejection head is fixedly connected to an output shaft of the ejection cylinder, and the ejection cylinder is started to enable the elastic ejection head to be pressed on the bottom surface of the workpiece.
In the fully automatic welding system for the snowplow casing, the driving assembly comprises a driving ring which is rotatably connected to the base, the driving ring is fixedly connected with the rotating station, a gear ring is arranged on the inner surface of the driving ring, the gear ring is meshed with a driving gear, and the driving gear is fixedly connected with an output shaft of a driving motor.
Compared with the prior art, the invention has the advantages that:
1. the invention utilizes the rotary station to install the workpiece and drives the workpiece to move so as to automatically complete welding, has higher automation degree, and can improve the effective utilization degree of the field and the comprehensive production benefit compared with the assembly line operation in a mode of rotating to complete welding.
2. According to the invention, the welding dust removal room is arranged outside the welding device, the welding process is completed in the dust removal space, and the welding device is safe and environment-friendly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a rotary station;
FIG. 3 is a schematic structural view of a weld fixture assembly;
FIG. 4 is an exploded view of a weld fixture assembly;
FIG. 5 is a schematic view of the structure of the base;
in the figure: the welding device comprises a welding device 1, a rotating station 2, a base 3, a driving assembly 4, a welding robot 11, a welding gun 12, a welding space 21, a rotating disk 22, a partition plate 23, a welding fixing assembly 24, a mounting plate 25, an ejection cylinder 26, an elastic top 27, a driving ring 41, a gear ring 42, a driving gear 43, an output shaft 44, a workpiece 100, a welding dust removal room 200, a dust removal space 201, a dust removal pipeline 202, a limiting plate 240, an operation cavity 241, a fixing bowl 242, an opening 243, a mounting groove 244, a support 245, a clamping cylinder 246, a clamping plate 247, an electromagnet 248 and a limiting cylinder 249.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 5, the full-automatic welding system for the snowplow casing comprises a welding device 1 for welding a workpiece 100 and further comprises a rotating station 2, a welding space 21 for installing the workpiece 100 is formed in the rotating station 2, the rotating station 2 is installed on a base 3, a driving assembly 4 installed on the base 3 is in driving connection with the rotating station 2, and the rotating station 2 is rotated to enable the welding space 21 to move close to or far away from the welding device 1.
When the welding device is used, a workpiece 100 is arranged on the rotating station 2, the driving assembly 4 drives the rotating station 2 to rotate, so that the welding space 21 moves close to the welding device 1, the workpiece 100 is conveyed to a position where the welding device 1 can weld conveniently, the driving assembly 4 stops driving at the moment, and after the welding device 1 finishes welding, the driving assembly 4 is restarted, and welding is performed in a circulating mode. Therefore, the workpiece 100 is installed by the rotary station 2, the workpiece 100 is driven to move to automatically complete welding, the automation degree is high, and meanwhile, compared with a mode of completing welding by rotating, the mode of completing welding by the rotary station can improve the effective utilization degree of a field and improve the comprehensive production benefit.
Specifically, the driving assembly 4 comprises a driving ring 41 rotatably connected to the base 3, the driving ring 41 is fixedly connected to the rotary station 2, a gear ring 42 is disposed on an inner surface of the driving ring 41, the gear ring 42 is engaged with a driving gear 43, and the driving gear 43 is fixedly connected to an output shaft 44 of a driving motor.
In use, the output shaft 44 of the driving motor drives the driving gear 43 to rotate, and the driving gear 43 is transmitted to the gear ring 42 through gear engagement, so that the driving ring 41 rotates, and the driving ring 41 drives the rotating disk 22 in the rotating station 2 to rotate.
As shown in fig. 1, the welding device 1 includes a welding robot 11 and a welding gun 12 connected to an end of the welding robot 11, the welding device 1 and the welding space 21 are provided in plurality, and the number of the welding space 21 is at least one more than that of the welding device 1.
The welding device 1 is provided with a plurality of welding devices capable of realizing functional differentiation, namely different welding devices 1 respectively weld different positions of the workpiece 100, and the rotating station 2 drives the workpiece 100 to weld at the welding positions corresponding to the welding devices 1, so that the welding efficiency is improved. The welding spaces 21 are at least one more than the welding device 1, so that the workpiece 100 can be mounted on the rotary station 2 during welding, the drive assembly 4 is intermittently started to rotate the rotary station 2 intermittently, and each rotation is rotated by a distance of one welding space 21, so that at least one welding space 21 is not in a state to be welded, and relevant operation adjustment can be conveniently carried out manually, for example, a welded finished product is taken down and a new workpiece 100 is mounted.
As shown in fig. 1, the welding dust removal device further comprises a welding dust removal room 200 with a dust removal space 201 inside, the welding device 1 is located in the dust removal space 201, a dust removal pipeline 202 is further arranged on the welding dust removal room 200, one end of the dust removal pipeline 202 is communicated with a suction pump 203, and the other end of the dust removal pipeline 202 is communicated with the dust removal pipeline 202. According to the invention, the welding dust removal room 200 is arranged outside the welding device 1, and the welding process is completed in the dust removal space, so that the welding device is safe and environment-friendly.
Preferably, the rotation station 2 is partially located in the dust removing space 201, and the rotation of the rotation station 2 can make the welding space 21 enter or leave the dust removing space 201. Like this, when carrying out welding operation, the welding space 21 that work piece 100 was located is located dust removal space 201, because welding operation is accomplished by welding robot 11 is automatic, so operating personnel need not to enter into dust removal space 201 in, and when changing work piece 100, welding space 21 can be driven to realize outside dust removal space 201, and operating personnel need not to enter into dust removal space 201 in the full journey promptly, has guaranteed operating personnel's operational environment.
With reference to fig. 2 to 4, the rotating station 2 includes a rotating disk 22 in driving connection with the driving assembly 4, the welding space 21 is located above the rotating disk 22, and two adjacent welding spaces 21 are separated by a partition 23, the partition 23 is fixedly connected to the rotating disk 22, a welding fixing assembly 24 for fixing the workpiece 100 is further arranged on the rotating disk 22, and the welding fixing assembly 24 is located in the welding space 21 and is in one-to-one correspondence with the welding space 21.
Specifically, the welding fixture assembly 24 includes a fixing bowl 242 having an operation cavity 241 therein, the fixing bowl 242 is disposed obliquely, and the fixing bowl 242 is disposed obliquely so that the workpiece 100 fixed on the fixing bowl 242 is also in an oblique state, thereby facilitating the welding operation. The bottom surface of the fixed bowl 242 is arc-shaped, one side of the fixed bowl 242 close to the edge of the rotating disk 22 is provided with an opening 243, the opening 243 is communicated with the operation cavity 241, the bottom surface of the fixed bowl 242 is further provided with a mounting groove 244 with the edge shape matched with the edge shape of the workpiece 100, and the mounting groove 244 is communicated with the operation cavity 241.
Referring to fig. 3 and 4, the welding and fixing assembly 24 further includes a bracket 245 fixedly connected to the rotating disc 22 and located on both sides of the fixing bowl 242, a clamping cylinder 246 is disposed on the bracket 245, a clamping plate 247 is connected to the clamping cylinder 246, a plurality of electromagnets 248 are disposed at one end of the clamping plate 247 away from the clamping cylinder 246, and the electromagnets 248 can be attached to the side surface of the fixing bowl 242 by moving the clamping plate 247. The welding and fixing assembly 24 further comprises a limiting cylinder 249 fixedly connected to the rotating disc 22, an output shaft of the limiting cylinder 249 is connected with a limiting plate 240, and the limiting plate 240 can be pressed on the lower end edge of the fixing bowl 242 by moving the limiting plate 240.
During the use, the clamp cylinder 246 drives the clamp plate 247 for the electro-magnet 248 on the clamp plate 247 is laminated on the both sides of the fixed bowl 242, and spacing and fixing are realized to the fixed bowl 242, and the spacing cylinder 249 also drives the limiting plate 240 to press and establish on the lower end edge of the fixed bowl 242 at this moment, further fixes the whole fixed bowl 242, prevents that the fixed bowl 242 from shifting in the welding process, thereby guarantees the welded accuracy.
As shown in fig. 4, an ejection mechanism for ejecting the workpiece 100 is further disposed on the rotating station 2, the ejection mechanism includes an installation plate 25 fixedly connected to the rotating disc 22 or the welding and fixing assembly 24, an ejection cylinder 26 is disposed on the installation plate 25, an elastic ejector 27 is fixedly connected to an output shaft of the ejection cylinder 26, and the elastic ejector 27 is pressed on the bottom surface of the workpiece 100 by activating the ejection cylinder 26. After the welding is completed, the ejection cylinder 26 drives the elastic ejection head 27 to push the workpiece 100, so that the workpiece 100 is separated from the mounting groove 244, and the blanking is facilitated.
The working principle of the invention is as follows: when the welding device is used, a workpiece 100 is installed in the installation groove 244, the clamping cylinder 246 is started, the clamping cylinder 246 drives the clamping plate 247 to enable the electromagnet 248 on the clamping plate 247 to be attached to two sides of the fixed bowl 242 to limit and fix the fixed bowl 242, at the moment, the limiting cylinder 249 also drives the limiting plate 240 to be pressed on the lower end edge of the fixed bowl 242 to further fix the whole fixed bowl 242, the fixed bowl 242 is prevented from displacing in the welding process, the output shaft 44 of the driving motor drives the driving gear 43 to rotate, the driving gear 43 is in gear meshing transmission to the gear ring 42 to enable the driving ring 41 to rotate, the driving ring 41 drives the rotating disc 22 in the rotating station 2 to rotate, the driving motor adopts an intermittent driving mode to enable the rotating disc 22 to rotate intermittently, each time the rotating disc 22 rotates by the distance of one welding space 21, the workpiece 100 is conveyed to the position convenient for welding of the welding device 1 under the driving of the rotating disc 22, at this time, the driving motor stops driving, after the welding device 1 finishes welding, the driving motor is restarted, so that the welding space 21 with the welded workpiece 100 moves out of the dust removing space 201, the ejection cylinder 26 drives the elastic ejector 27 to push the workpiece 100, so that the workpiece 100 is separated from the mounting groove 244, and an operator mounts a new workpiece 100 into the mounting groove 244 to weld in a circulating manner. Therefore, the workpiece 100 is installed by the rotary station 2, the workpiece 100 is driven to move to automatically complete welding, the automation degree is high, and meanwhile, compared with a mode of completing welding by rotating, the mode of completing welding by the rotary station can improve the effective utilization degree of a field and improve the comprehensive production benefit.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although terms such as the welding apparatus 1, the rotation station 2, the base 3, the driving assembly 4, the welding robot 11, the welding gun 12, the welding space 21, the rotation disk 22, the partition plate 23, the welding fixing assembly 24, the mounting plate 25, the ejection cylinder 26, the elastic ejection head 27, the driving ring 41, the ring gear 42, the driving gear 43, the output shaft 44, the workpiece 100, the welding dust removing room 200, the dust removing space 201, the dust removing duct 202, the limit plate 240, the operation cavity 241, the fixing bowl 242, the opening 243, the mounting groove 244, the bracket 245, the clamping cylinder 246, the clamping plate 247, the electromagnet 248, the limit cylinder 249, and the like are used more frequently herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A snowplow casing full-automatic welding system, includes welding set (1) that is used for welding work piece (100), its characterized in that: still include rotatory station (2), be equipped with welding space (21) that are used for installing work piece (100) on rotatory station (2), rotatory station (2) are installed on base (3), install drive assembly (4) on base (3) and are connected with rotatory station (2) drive, rotate rotatory station (2) and can make welding space (21) take place to be close to or keep away from the removal of welding set (1).
2. The snowplow housing fully automatic welding system of claim 1, wherein: welding set (1) is including welding robot (11) and welding gun (12) of connection at welding robot (11) tip, welding set (1) and welding space (21) all are equipped with a plurality of, and welding space (21) is more than welding set (1) at least one.
3. The snowplow housing fully automatic welding system of claim 1, wherein: still including inside welding dust removal room (200) that has dust removal space (201), welding set (1) is located dust removal space (201), still is equipped with dust removal pipeline (202) on welding dust removal room (200), dust removal pipeline (202) one end is linked together with aspiration pump (203), and the other end is linked together with dust removal pipeline (202).
4. The snowplow housing fully automatic welding system of claim 3, wherein: the part of the rotating station (2) is positioned in the dust removing space (201), and the welding space (21) can enter or leave the dust removing space (201) by rotating the rotating station (2).
5. The snowplow housing fully automatic welding system of claim 1, wherein: rotatory station (2) include rotary disk (22) be connected with drive assembly (4) drive, welding space (21) are located rotary disk (22) top and separate through baffle (23) between two adjacent welding space (21), baffle (23) fixed connection is on rotary disk (22), still be equipped with welded fastening subassembly (24) that are used for fixed work piece (100) on rotary disk (22), welded fastening subassembly (24) are located welding space (21) and set up with welding space (21) one-to-one.
6. The snowplow housing fully automatic welding system of claim 5, wherein: the welding fixing component (24) comprises a fixing bowl (242) with an operation cavity (241) inside, the fixing bowl (242) is arranged in an inclined mode, the bottom surface of the fixing bowl (242) is arc-shaped, an opening (243) is formed in one side, close to the edge of the rotating disc (22), of the fixing bowl (242), the opening (243) is communicated with the operation cavity (241), an installation groove (244) matched with the edge shape of the workpiece (100) is further formed in the bottom surface of the fixing bowl (242), and the installation groove (244) is communicated with the operation cavity (241).
7. The snowplow housing fully automatic welding system of claim 6, wherein: the welding fixing assembly (24) further comprises supports (245) which are fixedly connected to the rotating disc (22) and located on two sides of the fixing bowl (242), clamping cylinders (246) are arranged on the supports (245), clamping plates (247) are connected to the clamping cylinders (246), a plurality of electromagnets (248) are arranged at one ends, far away from the clamping cylinders (246), of the clamping plates (247), and the electromagnets (248) can be attached to the side faces of the fixing bowl (242) by moving the clamping plates (247).
8. The snowplow housing fully automatic welding system of claim 6, wherein: the welding fixing assembly (24) further comprises a limiting cylinder (249) fixedly connected to the rotating disc (22), a limiting plate (240) is connected to an output shaft of the limiting cylinder (249), and the limiting plate (240) can be pressed on the lower end edge of the fixing bowl (242) by moving the limiting plate (240).
9. The snowplow housing fully automatic welding system of claim 5, wherein: the rotary station (2) is further provided with an ejection mechanism for ejecting the workpiece (100), the ejection mechanism comprises an installation plate (25) fixedly connected to the rotary disc (22) or the welding fixing assembly (24), the installation plate (25) is provided with an ejection cylinder (26), the elastic ejection head (27) is fixedly connected to an output shaft of the ejection cylinder (26), and the ejection cylinder (26) is started to enable the elastic ejection head (27) to be pressed on the bottom surface of the workpiece (100).
10. The snowplow housing fully automatic welding system of claim 1, wherein: the driving assembly (4) comprises a driving ring (41) which is rotatably connected to the base (3), the driving ring (41) is fixedly connected with the rotating station (2), a gear ring (42) is arranged on the inner surface of the driving ring (41), the gear ring (42) is meshed with a driving gear (43), and the driving gear (43) is fixedly connected with an output shaft (44) of a driving motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110683349.XA CN113427174A (en) | 2021-06-21 | 2021-06-21 | Full-automatic welding system for snow sweeper housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110683349.XA CN113427174A (en) | 2021-06-21 | 2021-06-21 | Full-automatic welding system for snow sweeper housing |
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| Publication Number | Publication Date |
|---|---|
| CN113427174A true CN113427174A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110683349.XA Pending CN113427174A (en) | 2021-06-21 | 2021-06-21 | Full-automatic welding system for snow sweeper housing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227088A (en) * | 2022-02-28 | 2022-03-25 | 江苏鸿迅机车有限公司 | Welding device and method for electric tricycle production |
-
2021
- 2021-06-21 CN CN202110683349.XA patent/CN113427174A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227088A (en) * | 2022-02-28 | 2022-03-25 | 江苏鸿迅机车有限公司 | Welding device and method for electric tricycle production |
| CN114227088B (en) * | 2022-02-28 | 2022-04-29 | 江苏鸿迅机车有限公司 | Welding device and method for electric tricycle production |
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