Laser cutting machine

Abstract

The laser cutting machine comprises a portal frame and a cutting mechanism, the portal frame comprises a supporting assembly and a reinforcing assembly, the supporting assembly comprises a transverse frame and two sets of vertical arms, the two sets of vertical arms are arranged on the two sides of the transverse frame respectively to support the transverse frame, and the reinforcing assembly comprises a first supporting arm and two second supporting arms. The first supporting arm is vertically arranged in the middle of the transverse frame, one end of each second supporting arm is fixedly connected to the transverse frame, the other end of each second supporting arm is fixedly connected to the first supporting arm, and the two second supporting arms are symmetrically arranged on the two sides of the first supporting arm; the cutting mechanism comprises a rotary workbench, a plurality of first laser cutting manipulators and a plurality of second laser cutting manipulators, the first laser cutting manipulators are fixedly connected to the transverse frame, the second laser cutting manipulators are arranged on the ground, and the first laser cutting manipulators and the second laser cutting manipulators are used for cutting workpieces. The structural strength of the portal frame can be improved, and the workpiece machining precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting, in particular to a laser cutting machine. Background Art

[0002] Laser cutting is a common mechanical processing method, which mainly uses a robot to drive the laser to cut the workpiece. The existing robot is usually installed on a gantry, but the robot is heavy and has a large inertia, which can easily cause the gantry to deform and make the laser's movement position inaccurate, thereby affecting the cutting accuracy of the workpiece and the processing quality of the workpiece. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the utility model provides a laser cutting machine that can improve the structural strength of the gantry and enhance the processing accuracy of the workpiece.

[0004] According to a first aspect of an embodiment of the utility model, a laser cutting machine is provided, comprising a gantry and a cutting mechanism, the gantry comprising a supporting assembly and a reinforcing assembly, the supporting assembly comprising a horizontal frame and two groups of vertical arms, the two groups of vertical arms are respectively arranged on both sides of the horizontal frame to support the horizontal frame, the reinforcing assembly comprises a first support arm and two second support arms, the first support arm is vertically arranged in the middle of the horizontal frame, one end of the second support arm is fixedly connected to the horizontal frame, the other end of the second support arm is fixedly connected to the first support arm, and the two second support arms are symmetrically arranged on both sides of the first support arm; the cutting mechanism comprises a rotating worktable, a plurality of first laser cutting robots and a plurality of second laser cutting robots, the rotating worktable is used to carry a workpiece, the plurality of first laser cutting robots are all fixedly connected to the horizontal frame, the plurality of second laser cutting robots are all arranged on the ground, and the first laser cutting robot and the second laser cutting robot are both used to cut the workpiece.

[0005] The laser cutting machine of the embodiment of the utility model has at least the following beneficial effects: two groups of vertical arms are respectively arranged on both sides of the horizontal frame, the horizontal frame is supported by the two vertical arms, a plurality of first laser cutting manipulators are fixedly connected to the horizontal frame, a plurality of second laser cutting manipulators are arranged on the ground, a workpiece is arranged on a rotating worktable, and the workpiece is driven by the rotating worktable to rotate within the motion range of the first laser cutting manipulator and the second laser manipulator, so that the first laser cutting manipulator and the second laser manipulator cooperate to automatically cut the workpiece, thereby improving the processing efficiency of the workpiece. The first arm is vertically arranged in the middle of the horizontal frame, one end of the second arm is fixedly connected to the horizontal frame, and the other end is fixedly connected to the first arm, so that the two second arms are symmetrically arranged on both sides of the first arm, and the cooperation of the first arm and the second arm can improve the structural rigidity of the horizontal frame, reduce the possibility of bending and deformation of the horizontal frame, thereby stabilizing the position of the first laser cutting manipulator, and further can improve the cutting accuracy of the workpiece and improve the processing quality of the workpiece.

[0006] According to some embodiments of the present invention, the number of the reinforcement components is set to two groups, and the two groups of reinforcement components are respectively arranged on both sides of the cross frame.

[0007] According to some embodiments of the utility model, the reinforcement assembly includes a third arm and two fourth arms, the two ends of the third arm are respectively fixedly connected to the two second arms of the two groups of the reinforcement assemblies, and the two fourth arms are respectively fixedly connected to the two ends of the third arm, and the fourth arm is fixedly connected between the cross frame and the second arm.

[0008] According to some embodiments of the utility model, a support frame is fixedly connected to the middle portion of the cross frame, two groups of the reinforcement components are respectively arranged on both sides of the support frame, and the second support arm abuts against the support frame.

[0009] According to some embodiments of the utility model, the vertical arm includes two supporting legs, and the two supporting legs are arranged on both sides of the same side of the horizontal frame.

[0010] According to some embodiments of the utility model, a supporting cross bar is fixedly connected between the two supporting legs, and a plurality of diagonal bracing rods are fixedly connected between the supporting cross bar and the supporting legs.

[0011] According to some embodiments of the present utility model, the support assembly further includes a connecting plate, and two ends of the connecting plate are respectively fixedly connected to the cross frame and the vertical arm.

[0012] According to some embodiments of the utility model, the support assembly further includes a plurality of side supporting legs, one end of each side supporting leg is fixedly connected to the vertical arm, and the other end of each side supporting leg is supported on the ground.

[0013] According to some embodiments of the present invention, the cutting mechanism further includes two fences, and the two fences are respectively arranged on both sides of the rotating workbench.

[0014] According to some embodiments of the utility model, the cutting mechanism also includes a controller, a first safety grating and a second safety grating, the first safety grating is arranged in a vertical direction, the second safety grating is arranged in a horizontal direction, and the rotating worktable, the first safety grating and the second safety grating are all electrically connected to the controller.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a schematic diagram of a laser cutting machine according to an embodiment of the utility model;

[0018] Figure 2 It is a top view of the laser cutting machine of the embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the operation of the laser cutting machine of the embodiment of the utility model;

[0020] Figure 4 It is another operation schematic diagram of the laser cutting machine according to an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] Gantry 100, support assembly 110, cross frame 111, vertical arm 112, support frame 113, support leg 114, support cross bar 115, diagonal support bar 116, connecting plate 117, side support leg 118, reinforcement assembly 120, first support arm 121, second support arm 122, third support arm 123, fourth support arm 124;

[0023] Cutting mechanism 200 , rotating worktable 210 , baffle 211 , first laser cutting robot 220 , second laser cutting robot 230 , fence 240 , first safety grating 241 , second safety grating 242 , enclosure 250 . DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] It is understandable that, referring to Figures 1 to 4 The laser cutting machine of the utility model comprises a gantry 100 and a cutting mechanism 200. The gantry 100 comprises a supporting assembly 110 and a reinforcing assembly 120. The supporting assembly 110 comprises a horizontal frame 111 and two groups of vertical arms 112. The two groups of vertical arms 112 are respectively arranged on both sides of the horizontal frame 111 to support the horizontal frame 111. The reinforcing assembly 120 comprises a first arm 121 and two second arms 122. The first arm 121 is vertically arranged in the middle of the horizontal frame 111. One end of the second arm 122 is fixedly connected to the horizontal frame 111. The other end of the second arm 122 is fixedly connected to the horizontal frame 111. One end is fixedly connected to the first arm 121, and the two second arms 122 are symmetrically arranged on both sides of the first arm 121; the cutting mechanism 200 includes a rotating worktable 210, multiple first laser cutting robots 220 and multiple second laser cutting robots 230, the rotating worktable 210 is used to carry the workpiece, the multiple first laser cutting robots 220 are all fixedly connected to the horizontal frame 111, and the multiple second laser cutting robots 230 are all set on the ground, and the first laser cutting robot 220 and the second laser cutting robot 230 are both used to cut the workpiece.

[0029] Two groups of vertical arms 112 are respectively arranged on both sides of the horizontal frame 111, and the horizontal frame 111 is supported by the two vertical arms 112. Multiple first laser cutting robots 220 are fixedly connected to the horizontal frame 111, and multiple second laser cutting robots 230 are arranged on the ground. The workpiece is set on the rotating worktable 210, and the rotating worktable 210 drives the workpiece to rotate within the motion range of the first laser cutting robot 220 and the second laser cutting robot 230, so that the first laser cutting robot 220 and the second laser cutting robot 230 cooperate to automatically cut the workpiece, thereby improving the processing efficiency of the workpiece. The first arm 121 is vertically arranged in the middle of the cross frame 111, one end of the second arm 122 is fixedly connected to the cross frame 111, and the other end is fixedly connected to the first arm 121, so that the two second arms 122 are symmetrically arranged on both sides of the first arm 121. The cooperation between the first arm 121 and the second arm 122 can improve the structural strength of the cross frame 111 and reduce the possibility of bending and deformation of the cross frame 111, thereby stabilizing the position of the first laser cutting robot 220 and avoiding position deviation of the first laser cutting robot 220, thereby improving the cutting accuracy of the workpiece and improving the processing quality of the workpiece.

[0030] It should be noted that the first laser cutting robot 220 is fixedly mounted on the gantry 100, so that the gantry 100 needs to bear the weight of the first laser cutting robot 220, and when the first laser cutting robot 220 is moving at high speed or changing direction quickly, due to its large movement inertia, the load borne by the gantry 100 is unstable, which can easily cause the gantry 100 to deform, and then cause the movement position of the first laser cutting robot 220 to be inaccurate, affecting the cutting accuracy of the workpiece. By setting the first arm 121 and the second arm 122, the structural rigidity of the cross frame 111 can be enhanced, the bending deformation of the cross frame 111 can be reduced, and the cross frame 111 can fix the position of the first laser cutting robot 220, thereby improving the cutting accuracy of the workpiece.

[0031] It is understandable that, referring to Figure 2 and Figure 3 The number of reinforcing components 120 is set to two groups, and the two groups of reinforcing components 120 are respectively arranged on both sides of the cross frame 111. By arranging two groups of reinforcing components 120 on both sides of the cross frame 111, the two groups of reinforcing components 120 can absorb the bending stress of the cross frame 111, improve the rigidity of the cross frame 111, reduce the possibility of bending of the cross frame 111, facilitate stabilizing the position of the first laser cutting robot 220, and improve the processing accuracy of the workpiece.

[0032] In addition, two groups of reinforcing components 120 are disposed on both sides of the cross frame 111 so that the cross frame 111 can be subjected to balanced forces, thereby maintaining stability of the cross frame 111 and improving the reliability of the cross frame 111.

[0033] Specifically, refer to Figure 3 The reinforcement assembly 120 includes a third arm 123 and two fourth arms 124. The two ends of the third arm 123 are respectively fixedly connected to the two second arms 122 of the two groups of reinforcement assemblies 120, and the two fourth arms 124 are respectively fixedly connected to the two ends of the third arm 123. The fourth arm 124 is fixedly connected between the cross frame 111 and the second arm 122. The two ends of the third arm 123 are respectively connected to the two second arms 122 of the two groups of reinforcement assemblies 120. The stresses borne by the two groups of reinforcement assemblies 120 can be transmitted to each other through the third arm 123, so that the torsional rigidity of the cross frame 111 can be improved, and the deformation resistance of the cross frame 111 can be improved, thereby reducing the deformation of the cross frame 111, so that the first laser cutting robot 220 can be stabilized on the cross frame 111, and the processing accuracy of the workpiece can be improved.

[0034] In addition, one end of the fourth arm 124 is fixedly connected to the cross frame 111, and the other end is fixedly connected to the second arm 122, so that the fourth arm 124 can bear the bending stress of the second arm 122, thereby enabling the second arm 122 to remain stable, reducing the position shaking of the second arm 122, and improving the supporting stability of the cross frame 111, and the two fourth arms 124 are respectively located at the two ends of the third arm 123, so that the third arm 123 can enhance the torsional stiffness of the reinforcement assembly 120, so that the cross frame 111 can remain stable and improve the supporting stability.

[0035] It should be noted that the third arm 123 and the two fourth arms 124 are set as two groups, and the two groups of third arms 123 and two fourth arms 124 are symmetrically arranged on both sides of the first arm 121, so that the reinforcement component 120 can be balanced in force, thereby improving the reliability of the gantry 100.

[0036] Specifically, refer to Figure 3 The middle of the cross frame 111 is fixedly connected with a support frame 113, and two groups of reinforcement components 120 are respectively arranged on both sides of the support frame 113, and the second arm 122 abuts against the support frame 113. The support frame 113 is fixedly connected to the middle of the cross frame 111, and two groups of reinforcement components 120 are arranged on both sides of the support frame 113, so that the stress borne by the second arm 122 in the two groups of reinforcement components 120 can be transmitted more smoothly, the force bearing area of ​​the two groups of reinforcement components 120 can be increased, the force of the two groups of reinforcement components 120 can be more stable, and the reliability of the gantry 100 is improved.

[0037] In addition, the support frame 113 is connected to the middle part of the cross frame 111 , which can improve the bending and torsion resistance of the cross frame 111 , thereby improving the structural rigidity of the cross frame 111 and improving the reliability of the gantry 100 .

[0038] It can be understood that the support frame 113 is fixedly connected to the middle part of the cross frame 111. By setting the support frame 113, it is convenient to lift it by a crane, so as to lift the cross frame 111, thereby facilitating the assembly of the cross frame 111 and the vertical arm 112, thereby improving the assembly convenience of the gantry 100.

[0039] It should be noted that the horizontal frame 111 and the vertical arm 112, the first arm 121, the second arm 122, the third arm 123, the fourth arm 124 and the support frame 113 can be fixedly connected together by welding, riveting, etc., so that they can be stably connected to each other to avoid loosening and separation, thereby improving the reliability of the laser cutting machine.

[0040] It is understandable that, referring to Figure 3 and Figure 4 The vertical arm 112 includes two legs 114, and the two legs 114 are arranged on both sides of the same side of the horizontal frame 111. The two legs 114 are arranged on both sides of the same side of the horizontal frame 111. By arranging the two legs 114, the horizontal frame 111 can be stably stressed, and the position shaking of the horizontal frame 111 can be absorbed, so that the position of the horizontal frame 111 remains stable, thereby improving the reliability of the gantry 100.

[0041] It should be noted that the two legs 114 are respectively arranged on both sides of the same side of the cross frame 111 , so that the four legs 114 cooperate to support the cross frame 111 , thereby making the cross frame 111 stable in force and improving the reliability of the gantry 100 .

[0042] In addition, by providing two legs 114, the staff can enter the working range of the cutting mechanism 200 from between the two legs 114, which can facilitate the staff to observe and inspect the cutting process, improve the processing convenience of the workpiece, and improve the processing efficiency.

[0043] Specifically, refer to Figure 3 and Figure 4 A support cross bar 115 is fixedly connected between the two legs 114, and a plurality of diagonal braces 116 are fixedly connected between the support cross bar 115 and the legs 114. The two ends of the support cross bar 115 are fixedly connected to the two legs 114, respectively. The stresses borne by the two legs 114 can be mutually transmitted through the support cross bar 115, which can improve the bearing capacity of the two legs 114, so that both legs 114 can be stably connected to the cross frame 111, reduce the possibility of deformation of the legs 114, and improve the reliability of the gantry 100.

[0044] In addition, one end of the diagonal brace rod 116 is fixedly connected to the supporting cross bar 115, and the other end is fixedly connected to the supporting leg 114. By setting the diagonal brace rod 116, the position of the supporting cross bar 115 can be stabilized, the connection strength between the supporting cross bar 115 and the supporting leg 114 can be improved, the possibility of the supporting cross bar 115 loosening can be reduced, and the reliability of the gantry 100 can be improved.

[0045] It is understandable that, referring to Figure 3 and Figure 4 The support assembly 110 further includes a connecting plate 117, and the two ends of the connecting plate 117 are respectively fixedly connected to the horizontal frame 111 and the vertical arm 112. By arranging the two ends of the connecting plate 117 to connect the horizontal frame 111 and the vertical arm 112 respectively, the horizontal frame 111 and the vertical arm 112 can be fixed together, so that the connection between the horizontal frame 111 and the vertical arm 112 can be stably improved, the connection strength between the horizontal frame 111 and the vertical arm 112 is improved, and the reliability of the gantry 100 is improved.

[0046] It is understandable that, referring to Figure 3 and Figure 4 The support assembly 110 further includes a plurality of side legs 118, one end of which is fixedly connected to the vertical arm 112, and the other end of which is supported on the ground. The plurality of side legs 118 are all arranged obliquely, one end of which is fixedly connected to the vertical arm 112, and the other end of which is supported on the ground. By providing the side legs 118, the bearing capacity of the vertical arm 112 can be improved, so that the vertical arm 112 can be kept stable on the ground, the position of the vertical arm 112 can be prevented from shaking, and the support stability of the gantry 100 can be improved.

[0047] It should be noted that the legs 114 and the side legs 118 can be locked on the ground by fasteners, so that the legs 114 and the side legs 118 can be positioned on the ground, avoiding the position of the gantry 100 from shaking and improving the processing stability of the workpiece. In addition, the side legs 118 can be fixed on the legs 114 by welding, riveting, etc.

[0048] It is understandable that, referring to Figure 1 and Figure 2 The cutting mechanism 200 further includes two fences 240, which are respectively arranged on both sides of the rotating table 210. The two fences 240 are respectively arranged on both sides of the rotating table 210. By setting the two fences 240, the working range of the rotating table 210 can be enclosed, thereby preventing foreign objects from entering the rotating table 210 and improving the safety of work.

[0049] It should be noted that the cutting mechanism 200 is surrounded by a surrounding plate 250 along the circumferential direction. By providing the surrounding plate 250, the cutting mechanism 200 can be enclosed to improve the safety of the work.

[0050] Specifically, refer to Figure 1 and Figure 2 The rotary table 210 is provided with a first station and a second station, both of which are used to carry workpieces, and a baffle 211 is provided between the first station and the second station. The workpiece can be placed on the first station and the second station, and the rotary table 210 can drive the first station and the second station to enter the operating range of the cutting mechanism 200 in sequence, thereby realizing continuous processing of the workpiece and improving production efficiency.

[0051] In addition, by setting a baffle 211 between the first station and the second station, the baffle 211 can cooperate with the enclosure 250 to enclose the cutting mechanism 200, thereby preventing foreign matter from entering the operating range of the cutting mechanism 200 and improving the safety of the operation.

[0052] It is understandable that, referring to Figure 1 The cutting mechanism 200 further includes a controller, a first safety grating 241 and a second safety grating 242. The first safety grating 241 is arranged in the vertical direction, and the second safety grating 242 is arranged in the horizontal direction. The rotating table 210, the first safety grating 241 and the second safety grating 242 are all electrically connected to the controller. By arranging the first safety grating 241 and the second safety grating 242 on the fence 240, it is possible to detect whether there is foreign matter intrusion between the two fences 240. When the first safety grating 241 or the second safety grating 242 detects foreign matter, the controller controls the rotating table 210 to stop, so as to prevent foreign matter from being drawn into the working range of the cutting mechanism 200 and improve the stability of the workpiece.

[0053] In addition, the first safety grating 241 is arranged in the vertical direction, and the second safety grating 242 is arranged in the horizontal direction, so that the cooperation between the first safety grating 241 and the second safety grating 242 can improve the accuracy of foreign object detection and avoid missing foreign objects.

[0054] It should be noted that the first safety grating 241 and the second safety grating 242 both include a transmitter and a receiver, the transmitter is set on one of the fences 240, and the receiver is set on the other fence 240, so that it is convenient to detect whether there is a foreign object between the two fences 240, thereby improving the accuracy of detection. Among them, the first safety grating 241 and the second safety grating 242 can be infrared transceiver sensors or ultrasonic transceiver sensors; the controller can be a single-chip microcomputer, a programmable logic controller, an industrial computer, etc., which will not be described one by one here.

[0055] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Laser cutting machine, characterized in that, include: A gantry frame, comprising a support assembly and a reinforcement assembly, wherein the support assembly comprises a horizontal frame and two groups of vertical arms, wherein the two groups of vertical arms are respectively arranged on both sides of the horizontal frame to support the horizontal frame, and the reinforcement assembly comprises a first support arm and two second support arms, wherein the first support arm is vertically arranged in the middle of the horizontal frame, one end of the second support arm is fixedly connected to the horizontal frame, and the other end of the second support arm is fixedly connected to the first support arm, and the two second support arms are symmetrically arranged on both sides of the first support arm; The cutting mechanism includes a rotating worktable, a plurality of first laser cutting robots and a plurality of second laser cutting robots. The rotating worktable is used to carry the workpiece. The plurality of first laser cutting robots are fixedly connected to the horizontal frame. The plurality of second laser cutting robots are arranged on the ground. The first laser cutting robots and the second laser cutting robots are used to cut the workpiece.

2. The laser cutting machine according to claim 1, characterized in that: The number of the reinforcement components is set to two groups, and the two groups of reinforcement components are respectively arranged on both sides of the cross frame.

3. The laser cutting machine according to claim 2, characterized in that: The reinforcement assembly includes a third arm and two fourth arms, the two ends of the third arm are respectively fixedly connected to the two second arms of the two groups of the reinforcement assemblies, and the two fourth arms are respectively fixedly connected to the two ends of the third arm, and the fourth arm is fixedly connected between the cross frame and the second arm.

4. The laser cutting machine according to claim 2, characterized in that: A support frame is fixedly connected to the middle of the cross frame, two groups of reinforcement components are respectively arranged on both sides of the support frame, and the second support arm abuts against the support frame.

5. The laser cutting machine according to claim 1, characterized in that: The vertical arm includes two supporting legs, and the two supporting legs are arranged on both sides of the same side of the horizontal frame.

6. The laser cutting machine according to claim 5, characterized in that: A supporting cross bar is fixedly connected between the two supporting legs, and a plurality of diagonal bracing rods are fixedly connected between the supporting cross bar and the supporting legs.

7. The laser cutting machine according to claim 1, characterized in that: The support assembly also includes a connecting plate, and two ends of the connecting plate are respectively fixedly connected to the cross frame and the vertical arm.

8. The laser cutting machine according to claim 1, characterized in that: The support assembly also includes a plurality of side legs, one end of each side leg is fixedly connected to the vertical arm, and the other end of each side leg is supported on the ground.

9. The laser cutting machine according to claim 1, characterized in that: The cutting mechanism also includes two fences, which are respectively arranged on both sides of the rotating workbench.

10. The laser cutting machine according to claim 9, characterized in that: The cutting mechanism also includes a controller, a first safety grating and a second safety grating, wherein the first safety grating is arranged in a vertical direction, and the second safety grating is arranged in a horizontal direction, and the rotating worktable, the first safety grating and the second safety grating are all electrically connected to the controller.

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