Welding method and equipment for safety system airbag shell

Abstract

The invention discloses a welding method and equipment for a safety system airbag shell, and relates to the technical field of automobile part manufacturing. Comprising the following steps: acquiring an airbag shell ID, operator fingerprint information and current parameter information; the operator fingerprint information, the airbag shell ID and the current parameter information are sent to an MES system, and the MES system is requested to carry out comparison verification based on a preset standard process parameter set; receiving a control signal, wherein the control signal comprises a starting permission instruction or a starting prohibition instruction aiming at parameter consistency, and an equipment unlocking instruction or an equipment locking instruction aiming at a personnel verification result; and responding to the starting operation of the welding equipment when the welding equipment is allowed to be started and unlocked. The situation that in the production process of existing airbag shell welding equipment, identity information of operators cannot be confirmed, whether the current welding technological parameters of the welding equipment are consistent with the obtained welding parameters of the target airbag shell or not cannot be judged, and mistaken welding of the airbag shell is likely to be caused is improved.

Description

Technical Field

[0001] This application relates to the field of automotive parts manufacturing technology, and in particular to a welding method and equipment for a safety system airbag housing. Background Technology

[0002] The welding quality of the airbag shell in an automotive safety system directly affects the safety of driving a vehicle. Therefore, it places extremely high demands on the consistency of process parameters and the qualifications of operators during the production process.

[0003] Currently, existing airbag shell welding equipment typically employs a single serial interlock mechanism in its startup control logic. That is, once the equipment detects that the power is on, the equipment is functioning normally, and there are no alarm messages, it directly enters the "standby ready-to-run" state.

[0004] Regarding the aforementioned technologies, the inventors believe that existing airbag shell welding equipment has several drawbacks during the production process. It cannot verify the identity of the operator and cannot determine whether the current welding process parameters of the welding equipment are consistent with the welding parameters of the target airbag shell, which can easily lead to incorrect welding of the airbag shell. Summary of the Invention

[0005] To address the shortcomings of existing airbag shell welding equipment, which suffers from the inability to verify operator identity and determine whether the current welding process parameters match the target airbag shell welding parameters, leading to incorrect airbag shell welding, this application provides a welding method and equipment for airbag shells in safety systems.

[0006] To address the existing technical problems, the purpose of this application is to provide a welding method and equipment for the outer shell of a safety system airbag, which has the advantages of being able to verify the operator's information and determine the consistency of welding process parameters.

[0007] In a first aspect, this application provides a welding method for an airbag shell of a safety system, employing the following technical solution: operating on a welding device containing a control system, and comprising the following steps: S1: Obtain the airbag shell ID collected by the scanning device, the operator's fingerprint information collected by the fingerprint recognition device, and the current parameter information of the welding device; S2: Send the operator's fingerprint information, the airbag shell ID, and the current parameter information to the MES system to request the MES system to perform comparison and verification based on a preset set of standard process parameters; S3: Receive control signals from the MES system based on the comparison and verification results. The control signals include start-up permission instructions or start-up prohibition instructions for parameter consistency, and device unlock instructions or device lock instructions for personnel verification results. S4: Control the operating state of the welding equipment according to the control signal: if a control signal is received, execute whether to allow the welding equipment to start through the control signal, and execute whether to lock the welding equipment through the control signal; S5: When the welding equipment is allowed to start and the welding equipment is unlocked, in response to the start operation of the welding equipment, the pressing state of the fingerprint recognition device is detected to confirm the safety status of the operator; S6: After monitoring that the welding equipment has finished working, receive the airbag shell ID collected again by the barcode scanning device, and send the airbag shell ID, operator fingerprint information and the actual operating parameters of the welding equipment during the welding process to the MES system.

[0008] By adopting the above technical solution, the control system uploads the airbag shell ID and the current parameter information of the welding equipment to the MES system. When the airbag shell ID and the welding equipment are compared with the standard process parameter set, if the airbag shell ID is correct and the parameter information of the welding equipment matches the data in the standard process parameter set, the MES issues a start permission command to the control system, allowing the welding equipment to start. If the airbag shell ID is incorrect or the parameter information of the welding equipment does not match the data in the standard process parameter set, a start prohibition command is issued. By issuing the start prohibition command, the staff can promptly detect errors in the airbag shell or parameters, thus avoiding incorrect welding of airbag shell components and reducing losses caused by staff operation errors.

[0009] Furthermore, the fingerprint recognition device is not only used to collect the identity information of the staff and determine whether to lock the welding equipment based on the staff's identity information, but also to confirm the identity information of the operator. The control system can also determine the safety status of the staff by whether it can continuously receive the pressing status signal from the fingerprint recognition device. This improves the existing airbag shell welding equipment, which cannot confirm the identity information of the operator during the production process and cannot determine whether the current welding process parameters of the welding equipment are consistent with the welding parameters of the target airbag shell, which is prone to mis-welding of the airbag shell.

[0010] By storing and archiving the airbag shell ID, operator fingerprint information, and actual operating parameters of the welding equipment after welding, the MES system enables real-time traceability and querying of the airbag shell, thus facilitating quality management of airbag shell welding.

[0011] Preferably, the standard process parameter set includes the preheating temperature of the welding equipment, the welding time of the welding head, and the pressure threshold of the airbag shell during welding.

[0012] Preferably, when the control system receives a start permission command, the control system allows the welding equipment to start; when the control system receives a start prohibition command, the control system prohibits the welding equipment from starting.

[0013] By adopting the above technical solution, after receiving the instructions issued by the MES, the control system allows the welding equipment to start or prohibits the welding equipment from starting according to the instructions.

[0014] Preferably, when the control system receives the device unlock command, the control system releases the mechanical lock state of the welding equipment, allowing the welding equipment to enter a standby ready state; when the control system receives the device lock command, the control system controls the welding equipment to maintain the mechanical lock state and disables the start operation of the welding equipment.

[0015] By adopting the above technical solution, the control system receives instructions from the MES and locks or unlocks the welding equipment according to the instructions.

[0016] Preferably, the detection of the pressing state of the fingerprint recognition device in step S5 specifically includes: continuously monitoring the pressing signal of the fingerprint recognition device during the welding operation of the welding device; if the pressing signal is detected to be interrupted, the control system immediately controls the welding device to stop the welding operation and reset.

[0017] By adopting the above technical solution, the control system will continuously detect the pressing signal of the fingerprint recognition device. When the operator's hands stop pressing the fingerprint recognition device, the fingerprint recognition device stops transmitting the pressing signal to the control system, and the control system immediately controls the welding equipment to stop welding.

[0018] Preferably, the method also employs a CCD inspection mechanism, which is communicatively connected to the control system. The method further includes step S7: controlling the CCD inspection mechanism to acquire images of the airbag shell after welding, obtaining weld image data; and analyzing the weld image data to determine whether the welding quality is qualified.

[0019] By adopting the above technical solution, before welding begins, the control system will control the CCD detection mechanism to take pictures of the weld feet of the airbag shell. Then, by analyzing whether there are foreign objects in the weld feet and weld seams, and whether the weld feet are aligned, the airbag shell will be adjusted in time. After welding is completed, the control system will also control the CCD detection mechanism to take pictures of the weld feet of the airbag shell. The welding quality will be manually assessed, and the airbag shell or welding equipment can be adjusted, thereby reducing the probability of producing defective products.

[0020] The second aspect includes a control system configured to perform any of the above-described schemes.

[0021] Preferably, the system includes a body, a hot air mechanism, a welding mechanism, and a CCD detection mechanism. The control system is located inside the body, and a welding cavity is provided inside the body. The hot air mechanism, welding mechanism, and CCD detection mechanism are all located inside the welding cavity, and the hot air mechanism, welding mechanism, and CCD detection mechanism are all communicatively connected to the control system.

[0022] By adopting the above technical solution, the hot air mechanism is controlled by the control system. The hot air mechanism can heat and soften the airbag shell to be welded, thereby facilitating subsequent welding. The welding mechanism is used to weld the airbag shell, and the CCD inspection mechanism is used to photograph the weld seam and weld foot of the airbag shell.

[0023] Preferably, the welding cavity is further provided with a transfer mechanism, which is used to transfer the airbag shell.

[0024] By adopting the above technical solution, the transfer mechanism is used to move the airbag shell between the hot air mechanism, the welding mechanism, and the CCD inspection mechanism, thereby performing the welding operation.

[0025] In summary, this application includes at least one of the following beneficial technical effects: (1) The control system uploads the airbag shell ID and the current parameter information of the welding equipment to the MES system. When the airbag shell ID and the welding equipment are compared with the standard process parameter set, if the airbag shell ID is correct and the parameter information of the welding equipment matches the data in the standard process parameter set, the MES sends a start permission command to the control system to allow the welding equipment to start. If the airbag shell ID is incorrect or the parameter information of the welding equipment does not match the data in the standard process parameter set, a start prohibition command is issued. By issuing the start prohibition command, the staff can promptly detect airbag shell errors or parameter errors, avoid incorrect welding of airbag shell components, and reduce losses caused by staff operation errors.

[0026] (2) Used to collect the identity information of the staff, and to determine whether the welding equipment is locked by the identity information of the staff. It can confirm the identity information of the operator, which improves the existing airbag shell welding equipment that cannot confirm the identity information of the operator during the production process and cannot determine whether the current welding process parameters of the welding equipment are consistent with the welding parameters of the target airbag shell, which easily leads to the mis-welding of the airbag shell.

[0027] (3) The control system can also determine the safety status of the staff by whether it can continuously receive the pressing status signal from the fingerprint recognition device. Attached Figure Description

[0028] Figure 1This is a flowchart of a welding method for the outer shell of a safety system airbag in this embodiment; Figure 2 This is a schematic diagram of the structure of a welding device for an airbag shell of a safety system in this embodiment. Figure 1 ; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the structure of a welding device for an airbag shell of a safety system in this embodiment. Figure 2 .

[0029] Reference numerals: 1. Display; 2. Fingerprint recognition device; 3. Barcode scanning device; 4. Welding equipment; 5. Body; 6. Transfer mechanism; 7. Welding chamber; 8. Operation window; 9. Operation platform; 10. Wheel; 11. CCD inspection mechanism; 111. CCD camera; 112. Camera-sliding assembly; 12. Hot air mechanism; 121. Sliding assembly; 122. Hot air gun; 13. Welding mechanism; 131. Moving assembly; 132. Welded part. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0031] This application provides a welding method for the outer shell of a safety system airbag, employing the following technical solution: It includes a control system, a fingerprint recognition device 2, a barcode scanning device 3, and welding equipment. The control system is used for communication connection with the MES system, the fingerprint recognition device 2, the barcode scanning device 3, and the welding equipment. The method also utilizes a CCD detection mechanism 11, which is communication-connected to the control system, and includes the following steps: S1: Obtain the airbag shell ID collected by the barcode scanning device 3, the operator's fingerprint information collected by the fingerprint recognition device 2, and the current parameter information of the welding equipment; S2: Send the operator's fingerprint information, airbag shell ID, and current parameter information to the MES system to request the MES system to perform comparison and verification based on the preset standard process parameter set; S3: Receive control signals from the MES system based on the comparison and verification results. The control signals include start permission instructions or start prohibition instructions for parameter consistency, and device unlock instructions or device lock instructions for personnel verification results. S4: Control the operating status of the welding equipment according to the control signal: If a control signal is received, execute whether to allow the welding equipment to start, and execute whether to lock the welding equipment according to the control signal; S5: When the welding equipment is allowed to start and the welding equipment is unlocked, in response to the start operation of the welding equipment, the pressing state of the fingerprint recognition device 2 is detected to confirm the operator's safety status.

[0032] S6: After the welding equipment finishes working, receive the airbag shell ID collected again by the barcode scanner 3, and send the airbag shell ID and the actual operating parameters of the welding equipment during the welding process to the MES system so that the MES system can compare the actual operating parameters with the standard process parameter set. S7: Control the CCD detection mechanism 11 to acquire images of the airbag shell after welding, obtain weld image data; analyze the weld image data to determine whether the welding quality is qualified.

[0033] In this embodiment, the control system may be an industrial personal computer (IPC).

[0034] Considering the stability of the production environment and the requirements of image processing, the control system adopts an industrial control computer that includes an image processing module. The control system communicates with the MES system via Ethernet, connects to the fingerprint recognition device and barcode scanner 3 via serial port or USB interface, and controls the welding equipment and hot air mechanism via I / O interface.

[0035] The standard process parameter set includes the preheating temperature of the welding equipment, the welding time of the welding head, and the pressure threshold of the airbag shell during welding.

[0036] When the control system receives a start permission command, it allows the welding equipment to start; when the control system receives a start prohibition command, it prohibits the welding equipment from starting.

[0037] When the control system receives an unlock command, it releases the mechanical lock of the welding equipment, putting the welding equipment into a standby ready state; when the control system receives an unlock command, it keeps the welding equipment in a mechanical lock state and disables the start operation of the welding equipment.

[0038] The detection of the pressing state of the fingerprint recognition device 2 in step S5 specifically includes: continuously monitoring the pressing signal of the fingerprint recognition device 2 during the welding operation of the welding equipment; if the pressing signal is interrupted, the control system immediately controls the welding equipment to stop the welding operation and reset.

[0039] A welding apparatus for a safety system airbag shell includes a control system configured to perform any of the methods described above.

[0040] The system includes a body 5, a hot air mechanism 12, a welding mechanism 13, and a CCD detection mechanism 11. The control system is located inside the body 5, which contains a welding chamber 7. The hot air mechanism 12, welding mechanism 13, and CCD detection mechanism 11 are all located within the welding chamber 7 and are communicatively connected to the control system. Wheels 10 are located at the bottom of the body.

[0041] The welding cavity 7 is also equipped with a transfer mechanism 6, which is used to transfer the airbag shell and communicate with the control system. The barcode scanning device 3 uses a barcode scanner.

[0042] The machine body 5 is equipped with an operation window 8 that communicates with the welding cavity 7. An operation platform 9 is located outside the operation window 8. The transfer mechanism 6 is located on the bottom wall of the welding cavity 7 of the machine body 5 and is used to carry and transfer the airbag shell. The barcode scanner 3 is connected to the control system and is located on the machine body 5. A QR code is affixed to the airbag shell. The fingerprint recognition device 2 is used to collect the operator's fingerprint identity information and detect the state of both hands pressing. The hot air mechanism 12 and the welding mechanism 13 are both located in the welding cavity 7 of the machine body 5 and are located on one side of the transfer mechanism 6. The hot air mechanism 12 is used to soften the airbag shell on the transfer mechanism 6, and the welding mechanism 13 is used to weld the softened airbag shell. The CCD detection mechanism 11 is located in the welding cavity 7 of the machine body 5 and is used to acquire image data of the weld foot and weld seam of the airbag shell before and after welding.

[0043] The CCD inspection mechanism 11 includes a CCD camera 111 and a camera-sliding assembly 112. The camera-sliding assembly 112 is connected to the inner wall of the welding cavity 7. The CCD camera 111 is located at the sliding end of the camera-sliding assembly 112. The camera-sliding assembly 112 is used to drive the CCD camera 111 to slide within the welding cavity 7 to adjust the shooting position.

[0044] The transfer mechanism 6 first transports the airbag shell to the vicinity of the CCD mechanism. With the setting of the camera sliding assembly 112, the CCD camera 111 can slide in the welding cavity 7, thereby adjusting the position of the CCD detection mechanism 11 and making the CCD camera 111 capture images more clearly and accurately.

[0045] The hot air mechanism 12 includes a sliding component 121 and a hot air gun 122. The sliding component 121 is connected to the inner wall of the welding cavity 7, and the hot air gun 122 is disposed at the sliding end of the sliding component 121. When the sliding component 121 is activated, the hot air gun 122 can slide on the sliding component 121 to move closer to or away from the transfer mechanism 6.

[0046] By setting the sliding component 121, the hot air gun 122 can slide along the sliding component 121. When the airbag shell is brought under the hot air gun 122 by the transfer mechanism 6, the hot air gun 122 moves toward the airbag shell. After the hot air gun 122 is activated, it softens the airbag shell to facilitate subsequent welding operations. After softening, the hot air gun 122 moves away from the airbag shell, and then the airbag shell is transported by the transfer mechanism 6 to the vicinity of the welding mechanism 13.

[0047] The welding mechanism 13 includes a moving component 131 and a welding component 132. The moving component 131 is connected to the inner wall of the welding cavity 7, and the welding component 132 is disposed at the sliding end of the moving component 131. When the moving component 131 is started, the welding component 132 can slide in the vertical direction toward the transfer mechanism 6 under the drive of the moving component 131.

[0048] By setting the moving component 131, the welding component 132 can slide along the sliding component 121. Thus, when the airbag shell is brought under the welding component 132 by the transfer mechanism 6, the welding component 132 moves toward the airbag shell. After the welding component 132 is started, welding begins. After welding is completed, the hot air gun 122 moves away from the airbag shell, and then the airbag shell is transported back to the vicinity of the CCD mechanism by the transfer mechanism 6.

[0049] The welding component 132 uses an ultrasonic welding gun to generate ultrasonic vibrations to rub and weld the airbag shell; the moving component 131 uses a servo electric cylinder or a pneumatic slide.

[0050] The camera slide assembly 112, the sliding assembly 121 and the moving assembly 131 all adopt a linear slide table structure, and the camera slide assembly 112, the sliding assembly 121 and the moving assembly 131 are all fixed on the bottom wall of the welding cavity 7 and set perpendicular to the bottom wall.

[0051] The transfer mechanism 6 adopts a linear slide table. The sliding end of the linear slide table is equipped with a tooling. The tooling has a positioning groove that matches the shape of the airbag shell, which is used to fix the airbag shell during the transfer process.

[0052] The machine body 5 is also equipped with a display 1, which is electrically connected to the control system. The display 1 is used to display the weld foot image data acquired by the CCD inspection mechanism 11 and the verification results fed back by the MES system in real time.

[0053] There are two fingerprint recognition devices 2. The fingerprint recognition devices 2 adopt a press-type fingerprint sensor. The two fingerprint recognition devices 2 are respectively set on the left and right outermost edges of the operating platform 9, and the straight-line distance between the two fingerprint recognition devices 2 is greater than the span of a single hand's open palm, so as to force the operator to use both hands to operate at the same time.

[0054] The working process and beneficial effects of this application are as follows: An embodiment of this application provides a welding method and equipment for the outer shell of a safety system airbag. During use: The operator first presses their finger on the fingerprint recognition device 2 located on the operating platform 9 of the machine body 5, and uses the barcode scanner 3 to scan the QR code on the airbag shell to be welded, thereby obtaining the airbag shell ID.

[0055] The control system automatically collects current equipment process parameters, such as preheating temperature, welding time, and pressure setpoints; the control system packages and uploads personnel fingerprint features, airbag shell ID, and current process parameters to the MES system.

[0056] The MES system compares the parameters with a standard set of process parameters. If the verification passes (meaning the personnel are qualified and the parameters match), the MES system issues a start permit and an equipment unlock command, releasing the mechanical lock and entering standby mode. If the verification fails, the equipment remains locked and an alarm is triggered indicating incorrect parameters or unauthorized personnel.

[0057] After the equipment is unlocked, the operator places the airbag shell into the positioning fixture of the transfer mechanism 6.

[0058] Operators must use both hands to press the fingerprint recognition devices 2 located at the left and right ends of the operating platform 9 simultaneously.

[0059] After the control system detects the hand-pressing signal, it drives the transfer mechanism 6 to send the workpiece into the welding chamber 7. The transfer mechanism 6 then sends the workpiece to the CCD inspection mechanism 11, which then slides into place and captures high-definition images of the airbag shell weld and weld feet. The operator visually observes the weld image on the screen to check for stains, damage, or other issues that may affect the welding, and makes timely adjustments.

[0060] Then, the transfer mechanism 6 transports the workpiece to the hot air mechanism 12, which slides into place to soften the airbag shell with hot air. Next, the transfer mechanism 6 transports the workpiece to the welding mechanism 13, which presses down to weld the softened area.

[0061] Throughout the entire mechanical process described above, the operator's hands must remain continuously pressed on the fingerprint recognition device 2. If either hand releases its pressure, interrupting the pressing signal, the control system will immediately stop the operation and drive a reset to prevent mechanical injury accidents.

[0062] After the welding process is completed, the transfer mechanism 6 returns the finished airbag shell to the operation window 8. The operator then uses the barcode scanner 3 to scan the ID of the airbag shell again.

[0063] After confirming the identity of the workpiece, ensure that the process data to be uploaded corresponds exactly to the physical workpiece.

[0064] The control system uploads the ID from the secondary scan, the actual operating parameters during the welding process, and the operator information to the MES system for archiving.

[0065] The CCD inspection agency captured high-definition images of the airbag shell welds and weld feet.

[0066] The images are transmitted in real time to the display 1 on the outside of the machine body 5. The operator can visually observe the weld images on the screen to analyze whether there are any weld deviations, incomplete welds, or foreign objects.

[0067] Based on visual analysis, operators determine whether a product is qualified or unqualified, and then remove the workpiece and place it in the corresponding area.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding method for the outer shell of a safety system airbag, operating on welding equipment including a control system, characterized in that: Includes the following steps: S1: Obtain the airbag shell ID collected by the barcode scanning device (3), the operator's fingerprint information collected by the fingerprint recognition device (2), and the current parameter information of the welding equipment; S2: Send the operator's fingerprint information, the airbag shell ID, and the current parameter information to the MES system to request the MES system to perform comparison and verification based on a preset set of standard process parameters; S3: Receive control signals from the MES system based on the comparison and verification results. The control signals include start-up permission instructions or start-up prohibition instructions for parameter consistency, and device unlock instructions or device lock instructions for personnel verification results. S4: Control the operating state of the welding equipment according to the control signal: if a control signal is received, execute whether to allow the welding equipment to start through the control signal, and execute whether to lock the welding equipment through the control signal; S5: When the welding equipment is allowed to start and the welding equipment is unlocked, in response to the start operation of the welding equipment, the pressing state of the fingerprint recognition device (2) is detected to confirm the safety status of the operator; S6: After the welding equipment finishes working, receive the airbag shell ID collected again by the barcode scanner (3), and send the airbag shell ID, operator fingerprint information and the actual operating parameters of the welding equipment during the welding process to the MES system.

2. The welding method for the airbag shell of the safety system according to claim 1, characterized in that: The standard process parameter set includes the preheating temperature of the welding equipment, the welding time of the welding head, and the pressure threshold of the airbag shell during welding.

3. The welding method for the airbag shell of the safety system according to claim 1, characterized in that: When the control system receives a start permission command, the control system allows the welding equipment to start; when the control system receives a start prohibition command, the control system prohibits the welding equipment from starting.

4. The welding method for the airbag shell of the safety system according to claim 1, characterized in that: When the control system receives the device unlock command, the control system releases the mechanical lock of the welding equipment, allowing the welding equipment to enter a standby ready state; when the control system receives the device lock command, the control system controls the welding equipment to remain in the mechanical lock state and disables the start operation of the welding equipment.

5. The welding method for the airbag shell of the safety system according to claim 1, characterized in that: The detection of the pressing state of the fingerprint recognition device (2) in step S5 specifically includes: continuously monitoring the pressing signal of the fingerprint recognition device (2) during the welding operation of the welding equipment; if the pressing signal is interrupted, the control system immediately controls the welding equipment to stop the welding operation and reset.

6. The welding method for the airbag shell of the safety system according to claim 5, characterized in that: The method also uses a CCD detection mechanism (11), which is connected to the control system. The method further includes step S7: controlling the CCD detection mechanism (11) to acquire images of the airbag shell after welding and obtain weld image data; analyzing the weld image data to determine whether the welding quality is qualified.

7. A welding device for the outer shell of a safety system airbag, characterized in that: The system includes a control system configured to perform the method as described in any one of claims 1-6.

8. The welding equipment for the airbag shell of the safety system according to claim 7, characterized in that: The system includes a body (5), a hot air mechanism (12), a welding mechanism (13), and a CCD detection mechanism (11). The control system is located inside the body (5). A welding cavity (7) is provided inside the body (5). The hot air mechanism (12), the welding mechanism (13), and the CCD detection mechanism (11) are all located inside the welding cavity (7). The hot air mechanism (12), the welding mechanism (13), and the CCD detection mechanism (11) are all connected to the control system.

9. The welding equipment for the airbag shell of the safety system according to claim 8, characterized in that: The welding cavity (7) is also provided with a transfer mechanism (6), which is used to transfer the airbag shell.

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