A press fixture and welding system

Abstract

The utility model provides a kind of compression fixed equipment and welding system, it includes: compression mechanism, it includes bottom plate and compression frame, compression frame includes frame body and first docking piece, frame body is rotationally connected to bottom plate, and first docking piece is equipped with docking groove;Overturning mechanism, it includes push assembly, rotary driver and second docking piece, second docking piece is connected to the working end of rotary driver, and second docking piece is equipped with the plug-in protruding block that can be worn into docking groove.The utility model can realize the accurate, stable overturning process of compression frame, and overturning mechanism is arranged on production line, which can be matched with different compression mechanism, not only can avoid the overturning path of compression frame to realize the large-angle overturning of compression frame, but also can reduce the cost and volume of traditional driving structure by several times, improve the space utilization of production line.Based on this, the present application has the advantages of simple structure, strong compatibility, no overturning angle limit, low cost, small volume and compression stability.

Description

Technical Field

[0001] This utility model relates to the field of welding and fixing technology, specifically to a pressing and fixing device and welding system. Background Technology

[0002] In the welding process of sheet metal such as automotive door panels and body panels, it is usually necessary to use a pressing frame device to press and fix the edges of the sheet metal, and expose the area to be welded through the opening in the middle of the pressing frame, so as to cooperate with equipment such as welding guns and laser welding heads to complete the welding operation.

[0003] In the existing technology, the pressing frame device is mostly equipped with a linear motor or cylinder as the driving element on each pressing frame, which has obvious shortcomings.

[0004] On the one hand, each pressing frame is equipped with an independent driver, resulting in bulky and heavy equipment that not only occupies a lot of production line space but also increases the strength requirements of the mounting base. Furthermore, the extensive use of linear motors, cylinders, and their associated electronic control components has driven up procurement costs. The complex drive system has also significantly increased the difficulty and cost of later maintenance.

[0005] On the other hand, the actuator is directly installed on the pressure frame body, and its stroke and installation position will limit the opening and closing angle of the pressure frame. When loading and unloading large door panels or multi-layer panels, the narrow opening and closing space may make it impossible to pick up and put down the panels smoothly. When facing complex scenarios such as multi-angle welding and deep cavity structure welding, the pressure frame is difficult to adapt to the process requirements by opening and closing at a large angle or adjusting its posture, and may even interfere with the welding equipment.

[0006] Based on the above problems, the existing frame pressing device is costly and bulky due to its independent drive structure, and the opening and closing angle is limited, making it difficult to meet the needs of automated welding production lines for high efficiency and compatible production. Summary of the Invention

[0007] Therefore, the technical problem to be solved by this utility model is to overcome the problems of high cost, large size and limited opening angle of the pressing frame in the prior art, and to provide a pressing and fixing device and welding system.

[0008] To solve the above-mentioned technical problems, this utility model provides a pressing and fixing device, comprising: a pressing mechanism, which can be placed on a production line and moves with the production line; the pressing mechanism includes a base plate and a pressing frame; the material to be processed is placed between the base plate and the pressing frame; the pressing frame includes a frame body and a first docking member; one end of the frame body is rotatably connected to the base plate; the first docking member is disposed on one side of the frame body and has a docking groove; and a flipping mechanism, which includes a pushing assembly, a rotary driver, and a second docking member; wherein the pushing assembly is disposed on one side of the production line; the rotary driver is connected to the working end of the pushing assembly and moves along the width direction of the production line via the pushing assembly; the second docking member is connected to the working end of the rotary driver to rotate around a first rotation center line; the side of the second docking member facing the production line has an insertion protrusion; the insertion protrusion can pass through the docking groove to drive the pressing frame to move synchronously around the first rotation center line.

[0009] In one embodiment of this utility model, the pressing frame further includes a plurality of pressing blocks, which are disposed inside the frame and abut against the material to be processed.

[0010] In one embodiment of the present invention, the pressing mechanism further includes a rotating shaft, the first mating member is fixedly disposed at the end of the rotating shaft, the rotating shaft is rotatably connected to the base plate, and is fixedly connected to the pressing frame.

[0011] In one embodiment of the present invention, the base plate includes a plate body and at least one connecting column. At least one connecting column is disposed on the plate body. At least one rotating connecting block is provided on the pressure frame. The connecting column is disposed perpendicular to the base plate. The rotating shaft passes through and is connected to the connecting column. The rotating connecting block is connected to the frame body and is fixedly connected to the rotating shaft.

[0012] In one embodiment of the present invention, the flipping mechanism further includes a connecting plate and a fixing frame. The connecting plate is connected to the line body, the pushing component is disposed on the connecting plate, the fixing frame is connected to the working end of the pushing component, and the rotary driver is disposed on the fixing frame.

[0013] In one embodiment of this utility model, the push assembly includes a push driver, a slide plate, a transmission component, and at least one horizontal module. The horizontal module and the push driver are both disposed on the connecting plate. The horizontal module extends toward the line body along the width direction of the line body. One end of the transmission component is connected to the push driver, and the other end is connected to the slide plate. The slide plate is slidably connected to the horizontal module. The fixing frame is disposed on the slide plate and moves synchronously with the slide plate.

[0014] In one embodiment of the present invention, the pressing mechanism further includes at least one locking component, which is disposed on the base plate and located on one side of the pressing frame.

[0015] In one embodiment of the present invention, the locking assembly includes a mounting post, an opening and closing driver, a rotating frame, and a locking head. The mounting post is disposed on the base plate and extends in a vertical direction. The opening and closing driver is disposed on the mounting post. The rotating frame is connected to the working end of the opening and closing driver to rotate around a second rotation center line. The locking head is connected to the free end of the rotating frame and is disposed on the side of the rotating frame facing the pressure frame.

[0016] In one embodiment of the present invention, the pressing and fixing device further includes a control mechanism, and the pressing mechanism and the flipping mechanism are respectively connected to the control mechanism.

[0017] This utility model also provides a welding system, which includes the above-mentioned pressing and fixing device, transmission line and welding device. The transmission line is provided with a welding station. The welding device is disposed on one side of the welding station. The flipping mechanism in the pressing and fixing device is connected to the transmission line and is located on one side of the welding station. The pressing mechanism in the pressing and fixing device is disposed on the transmission line and moves with the transmission line.

[0018] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0019] In the pressing and fixing equipment and welding system described in this utility model, the pressing mechanism can be transported along the production line. When it moves to the target position, the flipping mechanism can cooperate with the pressing mechanism to flip the pressing frame, facilitating the feeding and pressing of the sheet metal to be processed. During this process, the first mating part in the pressing mechanism can be highly matched with the second mating part in the flipping mechanism to achieve a precise and stable flipping process of the pressing frame. Importantly, the flipping mechanism is set on the production line and can cooperate with different pressing mechanisms. It can not only avoid the flipping path of the pressing frame to achieve a large-angle flipping of the pressing frame, but also significantly reduce the cost and volume of traditional drive structures and improve the space utilization of the production line. Based on this, this application has the advantages of simple structure, strong compatibility, no flipping angle limitation, low cost, small size, and stable pressing. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a three-dimensional structural diagram of the pressing and fixing device in a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A three-dimensional structural schematic diagram of the pressing and fixing device from another perspective;

[0023] Figure 3 yes Figure 1 Enlarged structural diagram at point A in the middle;

[0024] Figure 4 yes Figure 1 A three-dimensional structural diagram of the flipping mechanism in the pressing and fixing device shown;

[0025] Figure 5 yes Figure 1 A three-dimensional structural diagram of the pressure frame and locking components in the pressing and fixing device shown;

[0026] Figure 6 yes Figure 1 The diagram shows a three-dimensional structural schematic of the locking component in the pressing and fixing device.

[0027] Explanation of reference numerals in the accompanying drawings: 100, pressing mechanism; 110, base plate; 111, plate body; 112, connecting column; 120, pressing frame; 121, frame body; 122, pressing block; 123, rotating connecting block; 124, first docking part; 130, rotating shaft; 140, locking assembly; 141, mounting column; 142, opening and closing driver; 143, rotating frame; 144, locking pressure head; 200, flipping mechanism; 210, connecting plate; 220, fixed frame; 230, rotating driver; 240, second docking part; 250, pushing assembly; 251, pushing driver; 252, horizontal module; 253, sliding plate; 254, transmission component; 1001, first rotation center line; 1002, second rotation center line. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0029] Example 1:

[0030] See Figure 1 and Figure 2As shown, this embodiment provides a pressing and fixing device, which includes: a pressing mechanism 100, which can be placed on a production line and moves with the production line; the pressing mechanism 100 includes a base plate 110 and a pressing frame 120; the plate to be processed is disposed between the base plate 110 and the pressing frame 120; the pressing frame 120 includes a frame body 121 and a first docking member 124; one end of the frame body 121 is rotatably connected to the base plate 110; the first docking member 124 is disposed on one side of the frame body 121 and has a docking groove; and a flipping mechanism 200, which includes a pushing assembly. The assembly includes a push assembly 250, a rotary driver 230, and a second docking member 240. The push assembly 250 is disposed on one side of the line body. The rotary driver 230 is connected to the working end of the push assembly 250 and moves along the width direction of the line body via the push assembly 250. The second docking member 240 is connected to the working end of the rotary driver 230 to rotate around the first rotation center line 1001. The second docking member 240 has an insertion protrusion on the side facing the line body. The insertion protrusion can pass through the docking groove to drive the pressure frame 120 to move synchronously around the first rotation center line 1001.

[0031] In the pressing and fixing equipment described in this embodiment, the pressing mechanism 100 can be transported along the production line. When it moves to the target position, the flipping mechanism 200 can cooperate with the pressing mechanism 100 to flip the pressing frame 120, so as to facilitate the feeding and pressing of the material to be processed. During this process, the first docking member 124 in the pressing mechanism 100 can cooperate closely with the second docking member 240 in the flipping mechanism 200 to achieve a precise and stable flipping process of the pressing frame 120. Importantly, the flipping mechanism 200 is set on the production line and can cooperate with different pressing mechanisms 100. It can not only avoid the flipping path of the pressing frame 120 to achieve a large-angle flipping of the pressing frame 120, but also significantly reduce the cost and volume of traditional drive structures and improve the space utilization of the production line. Based on this, this application has the advantages of simple structure, strong compatibility, no flipping angle limitation, low cost, small size and stable pressing.

[0032] Specifically, in this embodiment, the pressing mechanism 100 has the characteristic of moving with the conveyor belt. Its main function is to provide a carrier for the sheet metal to be processed, so as to realize the bearing and pressing and fixing of the sheet metal to be processed. Among them, the base plate 110 serves as the basic component for placing the sheet metal to be processed, providing support for the sheet metal, and is equipped with a handle to facilitate the operator's loading and unloading. The pressing frame 120 is used to press and fix the sheet metal to be processed on the base plate 110 by flipping it, so as to facilitate subsequent welding and other processing.

[0033] Furthermore, the pressing mechanism 100 in this embodiment also includes a rotating shaft 130. The first docking member 124 is fixedly disposed at the end of the rotating shaft 130. The rotating shaft 130 is rotatably connected to the base plate 110 and fixedly connected to the pressing frame 120. Further still, the base plate 110 includes a plate body 111 and at least one connecting post 112. At least one connecting post 112 is disposed on the plate body 111. The pressing frame 120 is provided with at least one rotating connecting block 123. The connecting post 112 is disposed perpendicular to the base plate 110. The rotating shaft 130 passes through and is connected to the connecting post 112. The rotating connecting block 123 is connected to the frame body 121 and fixedly connected to the rotating shaft 130. The rotating shaft 130 serves as the core rotating connector between the pressure frame 120 and the base plate 110. It provides physical support and a rotation axis for the pressure frame 120 to rotate around the base plate 110, ensuring that the pressure frame 120 can rotate stably around the first rotation center line 1001 and guaranteeing the accuracy of the rotation action. In this embodiment, the first rotation center line 1001 coincides with the axis of the rotating shaft 130. When the second docking member 240 of the rotation mechanism 200 engages with the docking groove of the first docking member 124 through the insertion protrusion and rotates, power can be transmitted through the first docking member 124 to the rotating shaft 130, and then the rotating shaft 130 drives the pressure frame 120 to rotate synchronously, realizing the power transmission chain of "docking-driving-rotation".

[0034] The connecting column 112 is a key component on the base plate 110 used to mount the rotating shaft 130. The connecting column 112 is vertically mounted on the plate body 111 of the base plate 110, providing a fixed mounting position for the rotating shaft 130, ensuring its stable mounting on the base plate 110 and maintaining a fixed axis during rotation. Simultaneously, the connecting column 112 transfers the force of the rotating shaft 130 to the plate body 111 of the base plate 110, preventing localized stress concentration caused by direct contact between the rotating shaft 130 and the plate body 111, thus enhancing the overall load-bearing capacity of the base plate 110, especially suitable for scenarios with high stress during pressing. Furthermore, in different embodiments, the distance between the rotating shaft 130 and the plate body 111 can be flexibly adjusted by setting connecting columns 112 of different heights to adapt to different thicknesses of the sheet metal to be processed or the pressure frame 120 structure, improving the compatibility of the equipment. This utility model does not specifically limit the specific height, location, or number of connecting columns 112.

[0035] The rotating connecting block 123 serves as a connecting bridge between the pressure frame 120 and the rotating shaft 130. One end of it is connected to the frame body 121 of the pressure frame 120, and the other end is fixedly connected to the rotating shaft 130, rigidly connecting the pressure frame 120 and the rotating shaft 130. This ensures that the rotation of the rotating shaft 130 can synchronously drive the pressure frame 120 to flip, preventing relative slippage between the two. When the pressure frame 120 flips or presses the sheet metal, the rotating connecting block 123 transmits the force on the frame body 121 to the rotating shaft 130, while simultaneously dispersing the localized force on the pressure frame 120, preventing deformation of the pressure frame 120 due to uneven force distribution, and extending the service life of the equipment.

[0036] In this embodiment, the pressing frame 120 includes a frame body 121 and a first docking member 124. The frame body 121 directly acts on the material to be processed to press and fix the edges of the material. The first docking member 124 is installed on one side of the frame body 121, and the docking groove on it can dock with the second docking member 240 of the flipping mechanism 200 to realize the subsequent flipping action. Further, the pressing frame 120 in this embodiment also includes multiple pressing blocks 122. The pressing blocks 122 are disposed inside the frame body 121 and abut against the material to be processed. The multiple pressing blocks 122 are distributed inside the frame body 121, which can distribute the total pressure applied by the pressing frame 120 to different areas of the material. On the one hand, it avoids excessive local pressure that may cause deformation or damage to the material. On the other hand, for materials with larger size or complex structure, the reasonable layout of the pressing blocks 122 can specifically strengthen the pressure in key areas to ensure consistent pressing effect. In different embodiments, the height, position or material of the pressing block 122 can be adjusted to adapt to plates of different thicknesses, surface morphologies or materials, thereby enhancing the versatility of the equipment. This utility model does not impose specific restrictions on the number, shape or design position of the pressing block 122.

[0037] See Figure 3 and Figure 4As shown, the flipping mechanism 200 in this embodiment is used to drive the pressure frame 120 to flip, thereby completing the feeding and pressing process of the sheet metal. It includes a connecting plate 210 and a fixing frame 220. The connecting plate 210 is connected to the line body, the pushing component 250 is disposed on the connecting plate 210, the fixing frame 220 is connected to the working end of the pushing component 250, and the rotary driver 230 is disposed on the fixing frame 220. The connecting plate 210 rigidly connects the flipping mechanism 200 to the line body, ensuring that the flipping mechanism 200 does not shift or shake during operation, providing a stable support foundation for the pushing component 250. Through the precise installation and positioning of the connecting plate 210, it can be ensured that the flipping mechanism 200 and the pressing mechanism 100 on the line body are highly matched in position, allowing the insertion protrusion of the second docking piece 240 to accurately insert into the docking groove of the pressing mechanism 100, improving docking accuracy. Furthermore, when the jacking assembly 250 is working, the connecting plate 210 distributes the reaction force generated by the jacking onto the line structure, avoiding excessive local stress that could cause line deformation and extending the service life of the equipment. The fixing frame 220 is an intermediate structure connecting the jacking assembly 250 and the rotary driver 230. It securely mounts the rotary driver 230 to the working end of the jacking assembly 250, making the two form a linked whole, ensuring that the linear motion of the jacking assembly 250 can be accurately transmitted to the rotary driver 230 and the second docking member 240.

[0038] Furthermore, the push assembly 250 is used to push the rotary driver 230 and the second docking member 240 to move along the width direction of the line body, ensuring that the second docking member 240 can accurately dock with the pressing mechanism 100. The push assembly 250 includes a push driver 251, a slide plate 253, a transmission member 254, and at least one horizontal module 252. The horizontal module 252 and the push driver 251 are both disposed on the connecting plate 210. The horizontal module 252 extends toward the line body along the width direction of the line body. One end of the transmission member 254 is connected to the push driver 251, and the other end is connected to the slide plate 253. The slide plate 253 is slidably connected to the horizontal module 252. The fixing frame 220 is disposed on the slide plate 253 and moves synchronously with the slide plate 253. In this embodiment, when the pressing mechanism 100 moves with the line to the working area of ​​the flipping mechanism 200, the push driver 251 can drive the slide plate 253 to move along the horizontal module 252 through the transmission component 254. Based on this, the slide plate 253 can drive the rotary driver 230 and the second docking component 240 on it to move synchronously toward the pressing mechanism 100 until the docking process of the first docking component 124 and the second docking component 240 is completed.

[0039] To ensure the stability of the relative position between the pressing frame 120 and the base plate 110 during the pressing process, and to improve the pressing effect of the pressing frame 120, the pressing mechanism 100 in this embodiment further includes at least one locking component 140. The locking component 140 is disposed on the base plate 110 and located on one side of the pressing frame 120. When the flipping mechanism 200 drives the pressing frame 120 to press the material to be processed, the locking component 140 can press down and fix the edge of the pressing frame 120. Specifically, see... Figure 5 and Figure 6 As shown, the locking assembly 140 in this embodiment includes a mounting post 141, an opening / closing actuator 142, a rotating frame 143, and a locking pressure head 144. The mounting post 141 is disposed on the base plate 110 and extends vertically. The opening / closing actuator 142 is disposed on the mounting post 141. The rotating frame 143 is connected to the working end of the opening / closing actuator 142 to rotate around a second rotation center line 1002. The locking pressure head 144 is connected to the free end of the rotating frame 143 and is disposed on the side of the rotating frame 143 facing the pressure frame 120. The mounting post 141 provides a fixed mounting platform for other structures in the locking assembly 140. The end of the rotating frame 143 is connected to the working end of the opening / closing actuator 142. The second rotation center line 1002 is disposed at the connection between the rotating frame 143 and the opening / closing actuator 142. The locking pressure head 144 can be configured as an elastic material to provide elastic protection for the pressure frame 120 during the locking process.

[0040] Furthermore, the pressing and fixing device in this embodiment also includes a control mechanism, with the pressing mechanism 100 and the flipping mechanism 200 respectively connected to the control mechanism. In actual production and processing, operators can adjust the above structure in real time through the control system, thereby improving the flexibility of the equipment. Parameters can also be preset through the control system, thereby improving the automation level of the equipment.

[0041] Example 2:

[0042] This embodiment provides a welding system, which includes the pressing and fixing device, the transmission line, and the welding device described in Embodiment 1. The transmission line is provided with a welding station, and the welding device is disposed on one side of the welding station. The flipping mechanism 200 in the pressing and fixing device is connected to the transmission line and is located on one side of the welding station. The pressing mechanism 100 in the pressing and fixing device is disposed on the transmission line and moves with the transmission line.

[0043] In summary, in the pressing and fixing equipment and welding system described in this utility model, the pressing mechanism 100 can be transported along the production line. When it moves to the target position, the flipping mechanism 200 can cooperate with the pressing mechanism 100 to flip the pressing frame 120, facilitating the feeding and pressing of the sheet metal to be processed. During this process, the first mating member 124 in the pressing mechanism 100 can be highly matched with the second mating member 240 in the flipping mechanism 200 to achieve a precise and stable flipping process for the pressing frame 120. Importantly, the flipping mechanism 200 is set on the production line and can cooperate with different pressing mechanisms 100. It can not only avoid the flipping path of the pressing frame 120 to achieve a large-angle flipping of the pressing frame 120, but also significantly reduce the cost and volume of traditional drive structures and improve the space utilization of the production line. Based on this, this application has the advantages of simple structure, strong compatibility, no flipping angle limitation, low cost, small size, and stable pressing.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A pressing and fixing device, characterized in that: include: A pressing mechanism is provided, which can be placed on the production line and move with the production line. It includes a base plate and a pressing frame. The material to be processed is placed between the base plate and the pressing frame. The pressing frame includes a frame body and a first docking member. One end of the frame body is rotatably connected to the base plate. The first docking member is disposed on one side of the frame body and has a docking groove. The flipping mechanism includes a pushing assembly, a rotary driver, and a second docking member. The pushing assembly is disposed on one side of the line body. The rotary driver is connected to the working end of the pushing assembly and moves along the width direction of the line body via the pushing assembly. The second docking member is connected to the working end of the rotary driver to rotate around a first rotation center line. The side of the second docking member facing the line body is provided with an insertion protrusion. The insertion protrusion can pass through the docking groove to drive the pressure frame to move synchronously around the first rotation center line.

2. The pressing and fixing device according to claim 1, characterized in that: The pressure frame also includes multiple pressure blocks, which are disposed inside the frame and abut against the material to be processed.

3. The pressing and fixing device according to claim 1, characterized in that: The pressing mechanism further includes a rotating shaft, the first docking member is fixedly disposed at the end of the rotating shaft, the rotating shaft is rotatably connected to the base plate, and is fixedly connected to the pressing frame.

4. The pressing and fixing device according to claim 3, characterized in that: The base plate includes a plate body and at least one connecting column. At least one connecting column is disposed on the plate body. At least one rotating connecting block is provided on the pressure frame. The connecting column is disposed perpendicular to the base plate. The rotating shaft passes through and is connected to the connecting column. The rotating connecting block is connected to the frame body and is fixedly connected to the rotating shaft.

5. The pressing and fixing device according to claim 1, characterized in that: The flipping mechanism also includes a connecting plate and a fixing frame. The connecting plate is connected to the line body, the pushing assembly is disposed on the connecting plate, the fixing frame is connected to the working end of the pushing assembly, and the rotary driver is disposed on the fixing frame.

6. The pressing and fixing device according to claim 5, characterized in that: The push assembly includes a push driver, a slide plate, a transmission component, and at least one horizontal module. The horizontal module and the push driver are both mounted on the connecting plate. The horizontal module extends toward the line along the width direction of the line. One end of the transmission component is connected to the push driver, and the other end is connected to the slide plate. The slide plate is slidably connected to the horizontal module. The fixing frame is mounted on the slide plate and moves synchronously with the slide plate.

7. The pressing and fixing device according to claim 1, characterized in that: The pressing mechanism further includes at least one locking component, which is disposed on the base plate and located on one side of the pressing frame.

8. The pressing and fixing device according to claim 7, characterized in that: The locking assembly includes a mounting post, an opening and closing actuator, a rotating frame, and a locking head. The mounting post is disposed on the base plate and extends vertically. The opening and closing actuator is disposed on the mounting post. The rotating frame is connected to the working end of the opening and closing actuator to rotate around a second rotation center line. The locking head is connected to the free end of the rotating frame and is disposed on the side of the rotating frame facing the pressure frame.

9. The pressing and fixing device according to claim 7, characterized in that: The pressing and fixing device also includes a control mechanism, and the pressing mechanism and the flipping mechanism are respectively connected to the control mechanism.

10. A welding system, characterized in that: The invention includes the pressing and fixing device, the transmission line, and the welding device as described in any one of claims 1 to 8. The transmission line is provided with a welding station, the welding device is disposed on one side of the welding station, the flipping mechanism in the pressing and fixing device is connected to the transmission line and is located on one side of the welding station, and the pressing mechanism in the pressing and fixing device is disposed on the transmission line and moves with the transmission line.

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