Laser offset welding equipment

Abstract

The present invention belongs to the technical field of laser welding equipment, and in particular, relates to a laser staggered welding equipment, including a main frame, a conveying device and a laser welding module, the conveying device includes two conveying modules, a driving motor and a pushing cylinder, the driving motor is used to drive the two conveying modules to convey the parts to be welded, and the pushing cylinder is arranged corresponding to the two conveying modules and pushes the parts to be welded from one conveying module to the other conveying module. The laser welding module includes two welding mechanisms, and the two welding mechanisms are respectively located on the sides of the two conveying modules away from each other in the width direction, and the two welding mechanisms are staggered. Since the two welding mechanisms are staggered, the parts to be welded will not be welded on both sides at the same time, but after the welding operation is completed on one side, the welding operation on the other side is completed at the other welding mechanism, thereby improving the double-sided welding efficiency of the parts to be welded and ensuring the safety of the parts to be welded during the welding process.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding equipment, and in particular relates to a laser dislocation welding equipment. Background Art

[0002] Laser welding is an efficient and precise welding method, which is often used for welding delicate parts such as electronic components. For electronic components that need double-sided welding, usually one side of the electronic component is welded first, and then the electronic component is turned around and welded on the other side, thereby achieving double-sided welding of the electronic component.

[0003] Although the above process method can effectively realize double-sided welding of electronic components, the efficiency is relatively low. When the double-sided welding method is used to weld both sides of the electronic components at the same time, since the electronic components are relatively small, it is easy for the laser energy to surge at the welding points on both sides during welding, causing damage to the electronic components. Summary of the invention

[0004] The purpose of the present invention is to provide a laser offset welding device, aiming to solve the technical problem of low efficiency of double-sided welding of electronic components in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a laser dislocation welding device, comprising:

[0006] Main frame;

[0007] The conveying device comprises two conveying modules, a driving motor and a pushing cylinder, wherein the two conveying modules are arranged in parallel on the main frame, the driving motor is installed on the main frame and is used to drive the two conveying modules to convey the workpieces to be welded, and the pushing cylinder is arranged corresponding to the two conveying modules and is used to push the workpieces to be welded from one conveying module to the other conveying module;

[0008] The laser welding module includes two welding mechanisms, both of which are installed on the main frame. The length direction of the two conveying modules is defined as the conveying direction. The two welding mechanisms are respectively located on the side away from each other in the width direction of the two conveying modules, and the two welding mechanisms are staggered.

[0009] Furthermore, the two welding mechanisms each include a laser emitter and a linear module, the two linear modules are both installed on the main frame and are respectively located on the side of the two conveying modules facing away from each other, the feeding directions of the two linear modules are respectively parallel to the width directions of the two conveying modules, the two laser emitters are respectively installed on the driving ends of the two conveying modules, and the emitting ends of the two laser emitters are respectively set corresponding to the conveying paths of the two conveying modules.

[0010] Furthermore, the two linear modules are both sliding table type hand-cranked linear modules.

[0011] Furthermore, the conveying device also includes a long track frame, which is installed on the main frame, and the two conveying modules are both installed on the long track frame.

[0012] Furthermore, the two conveying modules each include two conveying belts, a first pulley, a second pulley and a driving wheel, the first pulley is installed at one end of the track long frame along its length direction, the second pulley is installed at the other end of the track long frame along its length direction, the driving wheel is installed below the track long frame and is connected to the driving shaft of the driving motor, and the two conveying belts are both sleeved between the first pulley, the second pulley and the driving wheel.

[0013] Furthermore, the track frame includes a support plate, which is installed on the main frame. The support plate has two assembly long grooves. The bottom of the two assembly long grooves are provided with dividing strips along their length directions. The dividing strips divide the corresponding assembly long grooves into two unit grooves for supporting the conveyor belt.

[0014] Furthermore, the laser offset welding equipment also includes two limiting mechanisms, and the two limiting mechanisms are respectively arranged corresponding to the emitting ends of the two laser emitters, and the two limiting mechanisms each include an upper limit assembly, and the upper limit assembly includes an upper driving cylinder and a lower pressure block, the upper driving cylinder is installed above the support plate, and the lower pressure block is installed on the piston rod of the upper driving cylinder and is located above the support plate and is used to press downward on the workpiece to be welded.

[0015] Furthermore, the two limiting mechanisms also include a lower limiting assembly, which includes a lower driving cylinder and a lifting block. The lower driving cylinder is installed below the supporting plate, and the lifting block is installed on the piston rod of the lower driving cylinder. The lifting block is located below the supporting plate and is used to pass through the supporting plate to lift the part to be welded, and the lifting block is arranged opposite to the corresponding lower pressure block.

[0016] Furthermore, the conveying device also includes two blocking cylinders, both of which are installed on the main frame. The two blocking cylinders are respectively located on the side of the two conveying modules facing away from each other and are used to block the workpiece to be welded before it reaches the emitting end of the laser emitter.

[0017] Furthermore, the laser offset welding equipment also includes a sorting table, which is installed on one side of the main frame, and one end of the two conveying modules extending out of the main frame are both installed on the sorting table.

[0018] Beneficial effects of the present invention: When the laser dislocation welding equipment of the present invention is working, the workpiece to be welded (such as an electronic component that needs to be welded on both sides) is transmitted by a conveying module of the conveying device and transported to a welding mechanism of the laser welding module to complete the welding on one side. Due to the presence of the push cylinder, the workpiece to be welded that has completed single-side welding can be pushed to another conveying module, and then arrive at another welding mechanism under the transportation of the conveying module. Since the length direction of the two conveying modules is the conveying direction, and the two welding mechanisms are respectively located on the side away from each other in the width direction of the two conveying modules, when the workpiece to be welded moves to the welding mechanism, the other side to be welded can correspond to the welding mechanism, and then the welding operation on the other side of the workpiece to be welded is completed. Since the two welding mechanisms are dislocated, the workpiece to be welded will not be welded on both sides at the same time, but after the welding operation is completed on one side, the welding operation on the other side is completed at the other welding mechanism. In this way, while significantly improving the efficiency of double-sided welding of the workpiece to be welded, the safety of the workpiece to be welded during the welding process is also guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of the laser dislocation welding device provided in the embodiment of the present invention Figure 1 ;

[0021] Figure 2 A schematic diagram of the structure of the laser dislocation welding device provided in the embodiment of the present invention Figure 2 ;

[0022] Figure 3 A schematic diagram of the structure of the laser dislocation welding device provided in the embodiment of the present invention Figure 3 ;

[0023] Figure 4 for Figure 3 A local enlarged schematic diagram of the middle A;

[0024] Figure 5 A schematic diagram of the structure of a conveying device for a laser dislocation welding device provided in an embodiment of the present invention;

[0025] Figure 6 A schematic structural diagram of a support plate of a laser dislocation welding device provided in an embodiment of the present invention;

[0026] Figure 7 for Figure 6 A local enlarged schematic diagram of point B in the middle.

[0027] Among them, the reference numerals in the figure are:

[0028] 10—Main frame 11—Sorting table 12—Cover

[0029] 20—transmission device 21—transmission module 22—driving motor

[0030] 23 - Push cylinder 24 - Track rack 25 - Blocking cylinder

[0031] 30—Parts to be welded 31—Supporting part 40—Laser welding module

[0032] 41 - welding mechanism 50 - limiting mechanism 51 - upper limit assembly

[0033] 52—lower limit assembly 211—transmission belt 241—support plate

[0034] 242—Assembly long groove 243—Separation bar 244—Unit groove

[0035] 245—through port 251—blocking pin 411—laser transmitter

[0036] 412—Linear module 511—Upper drive cylinder 512—Lower pressure block

[0037] 513—fixed frame 521—lower driving cylinder 522—lifting block. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which 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. Figures 1 to 7 The described embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] like Figures 1 to 3 As shown, an embodiment of the present invention provides a laser dislocation welding device, including: a main frame 10, a conveying device 20 and a laser welding module 40. Among them, the conveying device 20 includes two conveying modules 21, a driving motor 22 and a pushing cylinder 23. Specifically, the two conveying modules 21 can be arranged on the main frame 10 in parallel, the driving motor 22 is arranged on the main frame 10 and is used to drive the two conveying modules 21 to convey the parts to be welded 30, and the pushing cylinder 23 is arranged corresponding to the two conveying modules 21 and is used to push the parts to be welded 30 from one conveying module 21 to another conveying module 21. The laser welding module 40 includes two welding mechanisms 41, both of which are installed on the main frame 10. The length direction of the two conveying modules 21 is defined as the conveying direction. The two welding mechanisms 41 are respectively located on the side away from each other in the width direction of the two conveying modules 21 (that is, perpendicular to the conveying direction of the conveying module 21), and the two welding mechanisms 41 are staggered. At the same time, a cover 12 may be installed on the main frame 10, and the conveying device 20 and the laser welding module 40 are both accommodated in the cover 12. A display control module is also installed on the cover 12, and the display control module is electrically connected to the conveying device 20 and the laser welding module 40 to control their operation. Optionally, when the parts 30 to be welded are relatively small, they can be installed in batches on the supporting member 31 and moved to the welding position for the laser welding module 40 under the conveyance of the conveying module 21, thereby realizing batch laser welding to improve welding efficiency.

[0043] Furthermore, the conveying directions of the two conveying modules 21 may be the same or different. When the conveying directions of the two conveying modules 21 are the same, the two conveying modules 21 may be arranged front to back in parallel on the main frame 10. The push cylinder 23 may be arranged corresponding to the end-to-end connection of the two conveying modules 21. When the conveying directions of the two conveying modules 21 are opposite, the two conveying modules 21 may be aligned front to back and arranged side by side on the main frame 10. The push cylinder 23 may be arranged corresponding to the same end of the two conveying modules 21, so that the two conveying modules 21 and the push cylinder 23 may form a C-shaped conveying path, thereby significantly saving the space occupied by the two conveying modules 21.

[0044] The laser dislocation welding device provided by the embodiment of the present invention is further described below: When the laser dislocation welding device provided by the embodiment of the present invention is working, the workpiece 30 to be welded (such as an electronic component that needs to be welded on both sides) is transmitted through a conveying module 21 of the conveying device 20, and is transported to a welding mechanism 41 of the laser welding module 40 to complete the welding on one side. Due to the presence of the pushing cylinder 23, the workpiece 30 to be welded that has completed single-side welding can be pushed to another conveying module 21, and then arrive at another welding mechanism 41 under the transportation of the conveying module 21. Since the length direction of the two conveying modules 21 is the conveying direction, and the two welding mechanisms 41 are respectively located on the side away from each other in the width direction of the two conveying modules 21, when the workpiece 30 to be welded moves to the welding mechanism 41, the other side to be welded can correspond to the welding mechanism 41, and then the welding operation on the other side of the workpiece 30 to be welded is completed. Since the two welding mechanisms 41 are staggered, welding operations will not be performed on both sides of the workpiece 30 at the same time. Instead, after the welding operation on one side is completed, the welding operation on the other side is completed at the other welding mechanism 41. This significantly improves the efficiency of double-sided welding of the workpiece 30 to be welded, while also ensuring the safety of the workpiece 30 to be welded during the welding process.

[0045] In another embodiment of the present invention, Figure 2As shown, the two welding mechanisms 41 each include a laser emitter 411 and a linear module 412. The two linear modules 412 are both mounted on the main frame 10 and are respectively located on the side of the two conveying modules 21 away from each other. The feeding directions of the two linear modules 412 are respectively parallel to the width directions of the two conveying modules 21. The two laser emitters 411 are respectively mounted on the driving ends of the two conveying modules 21, and the emitting ends of the two laser emitters 411 are respectively set corresponding to the conveying paths of the two conveying modules 21. Specifically, by installing the laser emitter 411 on the linear module 412, and making the feeding directions of the two linear modules 412 parallel to the conveying directions of the two conveying modules 21, the driving end of the linear module 412 can move toward or away from the conveying module 21. The laser emitter 411 installed on the driving end can also move closer to or farther away from the conveying module 21, thereby realizing the adjustment of the focal length of the emitting end of the laser emitter 411 relative to the parts to be welded on the conveying module 21.

[0046] In another embodiment of the present invention, Figure 2 As shown, both linear modules 412 are slide-type hand-cranked linear modules 412. Specifically, by defining both linear modules 412 as slide-type hand-cranked linear modules 412, the feed amount of the linear module 412 can be manually controlled, thereby achieving precise adjustment of the focal length of the laser emitter 411 relative to the workpiece 30 to be welded.

[0047] In another embodiment of the present invention, Figures 1 to 3 As shown, the conveying device 20 further includes a track frame 24, which is mounted on the main frame 10, and the two conveying modules 21 are both mounted on the track frame 24. Specifically, by mounting the conveying modules 21 on the track frame 24, it is avoided that the conveying modules 21 directly occupy the installation space on the main frame 10, and additional assembly space can be generated between the track frame 24 and the main frame 10, thereby further improving the space utilization rate of the main frame 10.

[0048] In another embodiment of the present invention, Figure 5As shown, the two conveying modules 21 each include two conveying belts 211, a first pulley (not shown), a second pulley (not shown) and a driving wheel (not shown), the first pulley is installed at one end of the track frame 24 along its length direction, the second pulley is installed at the other end of the track frame 24 along its length direction, the driving wheel is installed below the track frame 24 and is connected to the driving shaft of the driving motor 22, and the two conveying belts 211 are sleeved between the first pulley, the second pulley and the driving wheel. Specifically, since the two conveying belts 211 are sleeved between the first pulley, the second pulley and the driving wheel, the conveying belts 211 can rotate relative to the first pulley and the second pulley under the drive of the driving wheel, thereby realizing the conveying of the welded parts 30. At the same time, since the two conveying modules 21 each include the setting of two conveying belts 211, the welded parts 30 can be more stably transported under the transmission of the two conveying belts 211.

[0049] In another embodiment of the present invention, Figures 5 to 7 As shown, the track frame 24 includes a support plate 241, which is installed on the main frame 10. The support plate 241 is provided with two assembly long grooves 242. The bottoms of the two assembly long grooves 242 are provided with dividing strips 243 along their length direction. The dividing strips 243 divide the corresponding assembly long grooves 242 into two unit grooves 244 for supporting the conveyor belt 211. Specifically, by providing two assembly long grooves 242 on the support plate 241 and dividing the two assembly long grooves 242 into two unit grooves 244 by the dividing strips 243, the support plate 241 can better fit each conveyor belt 211. In this way, while ensuring the smooth operation of each conveyor belt 211, the assembly long grooves 242 are provided to provide a good running track for the welded parts 30, thereby ensuring the transmission stability of the welded parts 30.

[0050] In another embodiment of the present invention, Figure 4 As shown, the laser dislocation welding equipment also includes two limiting mechanisms 50, which are respectively arranged corresponding to the emission ends of the two laser emitters 411, and the two limiting mechanisms 50 each include an upper limit assembly 51, and the upper limit assembly 51 includes an upper driving cylinder 511 and a lower pressing block 512, the upper driving cylinder 511 is installed above the support plate 241, and the lower pressing block 512 is installed on the piston rod of the upper driving cylinder 511 and is located above the support plate 241 and is used to press down the welded part 30. Specifically, due to the existence of the upper limit assembly 51, when the welded part 30 moves to the position corresponding to the emission end of the laser emitter 411 and the conveying module 21 stops running, the upper driving cylinder 511 can drive the lower pressing block 512 to move downward, thereby pressing and fixing the welded part 30, so that the relative position of the welded part 30 and the emission end of the laser emitter 411 does not change, thereby significantly improving the welding accuracy.

[0051] In another embodiment of the present invention, Figure 4 As shown, both limit mechanisms 50 further include a lower limit assembly 52, which includes a lower driving cylinder 521 and a lifting block 522. The lower driving cylinder 521 is installed below the supporting plate 241, and the lifting block 522 is installed on the piston rod of the lower driving cylinder 521. The lifting block 522 is located below the supporting plate 241 and is used to pass through the supporting plate 241 to lift the welded part 30. The lifting block 522 is arranged opposite to the corresponding lower pressing block 512. Specifically, by setting the lower limit assembly 52, when the welded part 30 moves to the position corresponding to the emission end of the laser emitter 411 and the conveying module 21 stops running, the lifting block 522 can move upward under the action of the lower driving cylinder 521, and pass through the supporting plate 241 to lift the welded part 30. In this way, the welded part 30 is further stably limited relative to the emission end of the laser under the simultaneous limitation of the lower pressing block 512 and the lifting block 522. At the same time, by adjusting the piston rod stroke of the lower driving cylinder 521, the lifting position of the workpiece 30 to be welded can also be adjusted, so that the welding position of the workpiece 30 to be welded with different specifications can be directly opposite to the emission end of the laser emitter 411 during welding. Furthermore, the positions corresponding to the two lifting blocks 522 on the support plate 241 are provided with through holes 245 for the two lifting blocks 522 to pass through.

[0052] In another embodiment of the present invention, Figure 4 As shown, the upper limit assembly 51 and the lower limit assembly 52 also include a fixing frame 513, and the two fixing frames 513 are respectively installed on the upper end surface 241 and the lower end surface of the support plate, and the upper driving cylinder 511 and the lower driving cylinder 521 are respectively fixedly installed in the two fixing frames 513, thereby achieving a stable installation of the upper driving cylinder 511 and the lower driving cylinder 521 in the fixing frame 513.

[0053] In another embodiment of the present invention, Figure 4 As shown, the conveying device 20 also includes two blocking cylinders 25, both of which are installed on the main frame 10. The two blocking cylinders 25 are respectively located on the side of the two conveying modules 21 away from each other and are used to block the workpiece 30 to be welded before it reaches the emission end of the laser emitter 411. Specifically, a blocking pin 251 is installed on the piston rod of the two blocking cylinders 25. In this way, by setting up two blocking cylinders 25, the workpiece 30 to be welded is restricted from entering the welding position corresponding to the emission end of the laser emitter 411 at will. It is ensured that when there is a previous workpiece 30 to be welded at the welding position, the subsequent workpiece 30 to be welded can be blocked by the blocking cylinder 25 and will not enter the welding position, thereby avoiding interference with the welding operation of the previous workpiece 30 to be welded.

[0054] In another embodiment of the present invention, Figures 1 to 3 As shown, the laser dislocation welding equipment also includes a sorting table 11, which is installed on one side of the main frame 10, and the ends of the two conveying modules 21 extending out of the main frame 10 are both installed on the sorting table 11. Specifically, by setting the sorting table 11 at the ends of the two conveying modules 21 extending out of the main frame 10, the loading and unloading of the conveying modules 21 is greatly facilitated. The operator can stand on both sides of the sorting table 11 and place the parts to be welded 30 on the conveying module 21, or transfer the parts to be welded 30 sent by the conveying module 21 to the sorting table 11 for regular collection. In this way, the loading and unloading of the parts to be welded 30 are significantly simplified.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser dislocation welding device, characterized in that: include: Main frame; The conveying device comprises a driving motor, a pushing cylinder and two conveying modules, wherein the two conveying modules are arranged in parallel on the main frame, the driving motor is arranged on the main frame and is used to drive the two conveying modules to convey the parts to be welded, and the pushing cylinder is arranged corresponding to the two conveying modules and is used to push the parts to be welded from one conveying module to the other conveying module; the conveying device also comprises a track frame, and the track frame comprises a supporting plate; A laser welding module, comprising two welding mechanisms, both of which are mounted on the main frame, defining the length direction of the two conveying modules as the conveying direction, the two welding mechanisms are respectively located on the sides of the two conveying modules away from each other in the width direction, and the two welding mechanisms are staggered; both of the two welding mechanisms comprise a laser emitter and a linear module, both of which are mounted on the main frame and respectively located on the sides of the two conveying modules away from each other, the feeding directions of the two linear modules are respectively parallel to the width directions of the two conveying modules, the two laser emitters are respectively mounted on the driving ends of the two conveying modules, and the emitting ends of the two laser emitters are respectively arranged corresponding to the conveying paths of the two conveying modules; The laser offset welding equipment also includes two limiting mechanisms, which are respectively arranged corresponding to the emitting ends of the two laser emitters, and the two limiting mechanisms each include an upper limit assembly, which includes an upper driving cylinder and a lower pressure block, the upper driving cylinder is installed above the supporting plate, the lower pressure block is installed on the piston rod of the upper driving cylinder and is located above the supporting plate and is used to press down the workpiece to be welded; the two limiting mechanisms each also include a lower limit assembly, which includes a lower driving cylinder and a lifting block, the lower driving cylinder is installed below the supporting plate, the lifting block is installed on the piston rod of the lower driving cylinder, the lifting block is located below the supporting plate and is used to pass through the supporting plate to lift the workpiece to be welded, and the lifting block is arranged opposite to the corresponding lower pressure block.

2. The laser offset welding equipment according to claim 1, characterized in that: The two linear modules are both sliding table type hand-cranked linear modules.

3. The laser offset welding equipment according to claim 1, characterized in that: The track long frame is installed on the main frame, and the two transmission modules are installed on the track long frame.

4. The laser offset welding equipment according to claim 3 is characterized in that: The two conveying modules each include two conveying belts, a first pulley, a second pulley and a driving wheel. The first pulley is installed at one end of the track long frame along its length direction, and the second pulley is installed at the other end of the track long frame along its length direction. The driving wheels are installed below the track long frame and are connected to the driving shaft of the driving motor. The two conveying belts are both sleeved between the first pulley, the second pulley and the driving wheel.

5. The laser offset welding equipment according to claim 4, characterized in that: The track frame includes a plurality of supporting feet, each of which is installed on the main frame, and the supporting plate is installed on each of the supporting feet. The two first pulleys and the two second pulleys are respectively installed at opposite ends of the length direction of the supporting plate, and the two driving wheels are installed below the supporting plate. The driving motor is installed on one side of the supporting plate. The supporting plate is provided with two long assembly grooves, and the bottoms of the two long assembly grooves are provided with dividing strips along the length direction thereof, and the dividing strips divide the corresponding long assembly grooves into two unit grooves for supporting the corresponding conveyor belts.

6. The laser offset welding equipment according to any one of claims 1 to 5, characterized in that: The conveying device also includes two blocking cylinders, which are both installed on the main frame. The two blocking cylinders are respectively located on the sides of the two conveying modules facing away from each other and are used to block the parts to be welded before they reach the emitting end of the laser emitter.

7. The laser offset welding equipment according to any one of claims 1 to 5, characterized in that: The laser offset welding equipment also includes a sorting table, which is installed on one side of the main frame, and one end of the two conveying modules extending out of the main frame are both installed on the sorting table.

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