CN111673420A

CN111673420A - Intelligent assembling machine for LED lamp panel magnetic attraction columns

Info

Publication number: CN111673420A
Application number: CN202010693682.4A
Authority: CN
Inventors: 洪志刚; 凌黎明; 廖伟强; 黄庆栋; 刘贤瑜; 卢聪颖
Original assignee: Zhongshan Polytechnic
Current assignee: Zhongshan Polytechnic
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-09-18

Abstract

An intelligent assembling machine for LED lamp panel magnetic columns comprises a vibration disc, a magnetic steel conveying unit, a combination unit, a placing unit, a transportation unit and a manipulator unit; the placing unit comprises a placing disc and a rotary driving assembly for driving the placing disc to rotate; the transportation unit is used for conveying the lamp panel to be provided with the magnetic attraction pole to the placing panel; the vibration disc is used for conveying the steel column to be assembled to the combination unit; the magnetic steel conveying unit is used for conveying magnetic steel to be assembled to the combination unit; the combined unit comprises a combined assembly and a butt joint assembly, the combined assembly is used for combining the magnetic steel and the steel column, the butt joint assembly is used for moving the combined steel column to the lower part of the lamp panel and connecting the threaded hole of the steel column with the mounting hole reserved on the lamp panel; the manipulator unit comprises a screw screwing assembly and a carrying assembly, wherein the screw screwing assembly is used for screwing screws into the threaded holes and the mounting holes, and the carrying assembly is used for moving the lamp panel out of the placing tray. The invention can automatically assemble the magnetic steel and the steel column, thereby greatly improving the working efficiency.

Description

Intelligent assembling machine for LED lamp panel magnetic attraction columns

Technical Field

The invention relates to the technical field of magnetic attraction column assembly, in particular to an intelligent assembling machine for a magnetic attraction column of an LED lamp panel.

Background

Traditional LED lamp plate adopts the screw to be connected with the lamp bottom plate, and its shortcoming is that need take off the bottom plate is whole when the maintenance and change, and it is very inconvenient to operate. In order to solve the problem, the prior art has provided a way of fixing the magnetic attraction column. The basic principle is that the LED lamp panel is fixed at one end of the steel column through a screw, the other end of the steel column is provided with a magnetic steel, and the whole lamp panel is absorbed onto the iron bottom plate through the magnetic steel, so that the lamp panel can be maintained or replaced very conveniently.

For the magnetic attraction column, the magnetic steel and the steel column are assembled before use, the existing method is manual assembly by workers, the operation mode consumes a large amount of labor force, the working efficiency is low, and the magnetic attraction column is not suitable for batch production.

Disclosure of Invention

The invention provides an intelligent assembling machine for an LED lamp panel magnetic attraction column, which can automatically assemble magnetic steel and a steel column and greatly improve the working efficiency.

The embodiment of the invention provides an intelligent assembling machine for LED lamp panel magnetic poles, which comprises a vibration disc, a magnetic steel conveying unit, a combination unit, a placing unit, a conveying unit and a manipulator unit, wherein the placing unit comprises a placing disc and a rotation driving assembly for driving the placing disc to rotate, and the conveying unit is used for conveying a lamp panel to be provided with the magnetic poles to the placing disc; the steel disc vibration assembly comprises a vibration disc, a steel disc conveying unit, a steel disc and a connecting component, wherein the vibration disc is used for conveying a steel column to be assembled to a combination unit, the steel disc conveying unit is used for conveying steel magnets to be assembled to the combination unit, the combination unit comprises a combination component and a butt joint component, the combination component is used for combining the steel magnets and the steel column, and the butt joint component is used for moving the combined steel column to the position below a lamp disc and connecting a threaded hole of the steel column with a mounting hole reserved on the lamp disc; the manipulator unit comprises a screw screwing assembly and a carrying assembly, the screw screwing assembly is used for screwing screws into the threaded holes and the mounting holes, and the carrying assembly is used for moving the lamp panel out of the placing panel.

Preferably, the combined assembly comprises a feeding channel butted with the vibration disc and a pushing channel communicated with the feeding channel, one end of the pushing channel is provided with the pushing assembly, a blanking block is arranged above the other end of the pushing channel, the top of the blanking block is provided with an adsorption hole communicated with the pushing channel, and the adsorption hole is butted with the magnetic steel conveying unit; the pushing assembly is used for pushing the steel column in the pushing channel to the position below the blanking block.

Preferably, the butt joint subassembly is including the fixing base that is located the blanking piece outside, rotate the magnetism board of being connected and set up the magnetism driver of inhaling on the fixing base with the fixing base, magnetism is inhaled the driver and is used for the drive the board rotation is inhaled to magnetism, it extends to push away the material passageway magnetism inhales the below of board, and pushes away the material subassembly and be used for promoting the steel column of having made up to the below of inhaling the board of magnetism, magnetism is inhaled the steel column that the board is used for adsorbing its below.

Preferably, the fixing seats are provided with two, and the magnetic attraction plate is located between the two fixing seats.

Preferably, the material pushing assembly comprises an air cylinder, a push rod and a push plate arranged at the end part of the push rod.

Preferably, the manipulator unit comprises a multi-axis manipulator, the screw screwing assembly and the handling assembly are both arranged on the multi-axis manipulator, and the screw screwing assembly comprises an automatic screwdriver; and one side of the multi-axis mechanical arm is provided with a material box for loading screws, and the multi-axis mechanical arm is used for driving the automatic screwdriver to adsorb the screws from the material box and driving the screws on the automatic screwdriver to be in butt joint with the mounting holes.

Preferably, the carrying assembly comprises a fixed plate, two clamping jaws arranged at two ends of the fixed plate and a clamping jaw driver for driving the two clamping jaws to clamp or release.

Preferably, LED lamp plate magnetism post intelligence assembly machine still includes and moves the material unit, the transport subassembly is used for moving the lamp panel that the assembly was accomplished to the material unit that moves from placing the dish, moves the material unit and is used for carrying the lamp panel that the assembly was accomplished.

Preferably, the transportation unit and the material moving unit both comprise a bracket and a transportation roller arranged on the bracket.

Preferably, the surface of the placing disc is provided with a chuck which protrudes out of the surface of the placing disc and is coaxially arranged with the placing disc, the diameter of the chuck is smaller than the inner diameter of the lamp panel, and the diameter of the placing disc is smaller than the outer diameter of the lamp panel.

The invention has the following technical effects: the steel column to be assembled is conveyed through the vibration disc, the magnetic steel to be assembled is conveyed through the magnetic steel conveying unit, the steel column and the magnetic steel are installed in a combined mode through the combined assembly, the lamp disc is conveyed to the placing unit through the conveying unit, the combined steel column is moved to the position below the lamp disc through the butt joint assembly, the threaded hole of the steel column is in butt joint with the reserved installation hole in the lamp disc, the screw screwing assembly is used for screwing a screw into the threaded hole and the installation hole, and then the assembly of the single magnetic attraction column is completed. The rotation driving assembly drives the placing plate to rotate, so that the mounting holes reserved on the lamp panel are sequentially in butt joint with the threaded holes of the steel column, and the assembly of all the magnetic suction columns on the lamp panel is completed. The whole process is realized automatically, and the working efficiency is greatly improved.

Drawings

FIG. 1 is a schematic view of a magnetic attraction column according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an intelligent assembling machine for magnetic columns of LED lamp panels according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a combination unit according to an embodiment of the present invention;

FIG. 4 is a top view of a combination unit of an embodiment of the present invention.

Wherein the reference numerals are: the vibration plate comprises a vibration plate 1, a lamp panel 10, a slide rail 11, a steel column 101, magnetic steel 102, a slot 100, a combined unit 2, a bottom plate 21, a base 22, a feeding channel 221, a material pushing channel 222, a blanking block 23, a suction hole 230, an air cylinder 241, a push plate 242, a fixed seat 25, a magnetic suction plate 26, a fixed plate 27, a motor 28, a placing unit 3, a chuck 31, a transportation unit 4, a support 41, a transportation roller 42, a manipulator unit 5, a material box 50, a screw screwing assembly 51, a carrying assembly 52, a multi-axis manipulator 53 and a material moving unit 6.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

Before the intelligent assembling machine for the magnetic pole of the LED lamp panel of the present invention is specifically described, it is necessary to describe the structures of the magnetic pole and the lamp panel 10. As shown in fig. 1, the magnetic attraction column includes a steel column 101 and a magnetic steel 102, a slot 100 is provided at the bottom of the steel column 101, the magnetic steel 102 is magnetic and is attracted in the slot 100, a threaded hole is provided at the top of the steel column 101, and the steel column 101 can be fixed on the lamp panel 10 by a screw. The lamp panel 10 is ring shape, and it is provided with the mounting hole that runs through, and the magnetism post is installed promptly in the mounting hole, simultaneously, can be provided with a plurality of SMD LED on the lamp panel 10.

The embodiment of the invention provides an intelligent assembling machine for magnetic columns of LED lamp panels, which comprises a vibration disc 1, a magnetic steel conveying unit, a combination unit 2, a placement unit 3, a transportation unit 4 and a manipulator unit 5, wherein the combination unit 2, the transportation unit 4 and the manipulator unit 5 can be arranged around the placement unit 3 and can be positioned around the placement unit 3, as shown in figure 2. The vibrating disk 1 and the magnetic steel conveying unit can be arranged around the combination unit 2 and are respectively positioned on one side and above the combination unit 2.

The transporting unit 4 transports the lamp panel 10 to which the magnetic pole is to be mounted to the placing unit 3, and after one lamp panel 10 is completely assembled, the transporting unit 4 continues to transport the next lamp panel 10 to the placing unit 3. The placing unit 3 comprises a placing disc and a rotary driving assembly for driving the placing disc to rotate, as shown in the figure, the placing unit 3 can comprise a placing frame, the rotary driving assembly can be a rotary motor arranged on the placing frame, an output shaft of the rotary motor is coaxially connected with the placing disc, a lamp disc 10 conveyed by the conveying assembly 4 falls into the placing disc, and the placing disc is driven by the rotary motor to rotate. So that the mounting holes on the placing tray can be sequentially butted against the combined units 2.

The vibration disc 1 conveys the steel columns 101 to be assembled to the combination units 2, the steel columns 101 are conveyed to the combination units 2 one by one, and the magnetic steel conveying unit conveys the magnetic steel 102 to be assembled to the combination units 2. The combination unit 2 comprises a combination component and a docking component, wherein the combination component is used for combining the conveyed steel column 101 and the magnetic steel 102, namely, the magnetic steel 102 is placed in the groove 100 of the steel column 101, so that the magnetic steel 102 is adsorbed and fixed on the steel column 101.

The butt joint component moves the steel column 101 assembled with the magnetic steel 102 to the lower part of the lamp panel 10 and butt joints the threaded hole of the steel column 101 with the mounting hole reserved on the lamp panel 10, so as to mount and fix the screw. The manipulator unit 5 comprises a screw screwing assembly and a carrying assembly, the screw screwing assembly is used for screwing screws into the threaded holes and the mounting holes, and the magnetic attraction columns are assembled on the lamp panel 10. After all the mounting holes of the lamp panel 10 are provided with the magnetic posts, the carrying assembly can remove the lamp panel 10 from the placing tray.

The working principle of the intelligent assembling machine for the LED lamp panel magnetic attraction columns of the embodiment is as follows: the transportation unit 4 conveys the lamp panel 10 to the placing unit 3, the lamp panel 10 is placed on the placing panel, the rotating driving assembly drives the placing panel to rotate, the position of the lamp panel 10 is adjusted, and the first mounting hole is close to the combination unit 2 so that the butt joint assembly can perform the action of butt joint with the mounting hole. The vibration disc 1 conveys a steel column 101 to be assembled to a combined assembly, the magnetic steel conveying unit conveys magnetic steel 102 to be assembled to the combined assembly, the combined assembly combines the conveyed steel column 101 and the magnetic steel 102 and conveys the combined assembly to a butt joint assembly, the butt joint assembly moves the steel column 101 to the lower part of a lamp panel 10, a threaded hole of the steel column 101 is connected with a mounting hole reserved in the lamp panel 10, a mechanical arm unit 5 fixes screws in the threaded holes of the mounting hole and the steel column 101, and therefore the first mounting hole completes assembly of the magnetic attraction column. The rotation driving assembly drives the placing plate to rotate, and then the position of the lamp panel 10 is adjusted, so that the next mounting hole is close to the combined unit 2. The combined assembly continuously combines the conveyed steel column 101 and the magnetic steel 102 and conveys the combined steel column and the magnetic steel to the butt joint assembly, the butt joint assembly moves the steel column 101 to the position below the lamp panel 10, the threaded hole of the steel column 101 is connected with the mounting hole in the lamp panel 10, and the mechanical arm unit 5 fixes the screw in the mounting hole and the threaded hole of the steel column 101. And sequentially executing the actions until all the mounting holes are assembled with the magnetic suction columns, completing the assembly work of the lamp panel 10, moving the lamp panel 10 out of the placing panel by the carrying assembly, and continuously conveying the lamp panel 10 to be assembled with the magnetic suction columns to the placing unit 3 by the transporting unit 4.

In an embodiment, the structure of the combination unit 2 will be specifically described, as shown in fig. 3 and 4, the combination assembly includes a bottom plate 21, a base 22 is disposed on the bottom plate 21, a feeding channel 221 and a pushing channel 222 which are communicated with each other are disposed on the base 22, the feeding channel 221 and the pushing channel 222 can be disposed perpendicular to each other, the pushing channel 222 extends toward the placing tray, the feeding channel 221 and the pushing channel 222 can be grooves disposed on the upper surface of the base 22, and the pushing channel 222 can penetrate through the base 22 in the extending direction. The feeding channel 221 is butted with the vibration disc 1, specifically, a slide rail 11 may be arranged between the vibration disc 1 and the feeding channel 221, and a height of one end of the slide rail 11 close to the vibration disc 1 is greater than a height of one end of the slide rail 11 close to the feeding channel 221, so that the steel column 101 output by the vibration disc 1 automatically slides into the feeding channel 221, and continues to slide into the material pushing channel 222 under the action of inertia. The widths of the slide rail 11, the feeding channel 221 and the pushing channel 222 are set to be slightly larger than the diameter of the steel column 101 so that the steel column 101 can move individually and sequentially.

A material pushing assembly is arranged at one end of the material pushing channel 222 far away from the placing disc, a blanking block 23 is arranged above the other end of the material pushing channel 222, the blanking block 23 can be fixed on the upper surface of the base 22, a suction hole 230 communicated with the material pushing channel 222 is arranged at the top of the blanking block 23, the suction hole 230 is in butt joint with the magnetic steel conveying unit, the magnetic steel conveying unit conveys single secondary magnetic steel 102 to the suction hole 230 one by one, and the magnetic steel 102 falls into the material pushing channel 222 from the suction hole 230. The pushing assembly is used for pushing the steel column 101 in the pushing channel 222 to the lower side of the blanking block 23, the magnetic steel 102 falls into the slot 100 of the steel column 101, and based on the inherent magnetism of the magnetic steel 102, the magnetic steel 102 is fixed in the slot 100 of the steel column 101 in an adsorbing manner, so that the combined assembly of the magnetic steel 102 and the steel column 101 is completed.

In one embodiment, the docking assembly includes a fixing base 25 located outside the blanking block 23 (i.e. near the side where the tray is placed), a magnetic attraction plate 26 rotatably connected to the fixing base 25, and a magnetic attraction actuator 28 disposed on the fixing base 25, the fixing base 25 can be fixed on the outer side wall of the bottom plate 21, the fixing plate 27 is fixed on the bottom plate 21, the magnetic attraction actuator 28 is fixed on the fixing plate 27 again, the magnetic attraction actuator 28 can be a motor, an output shaft of the magnetic attraction actuator passes through the fixing base 25 from the outside of the fixing base 25, and is connected to the magnetic attraction plate 26 inside the fixing base 25, and the magnetic attraction plate 26 is driven to rotate by the. The magnetic attraction plate 26 has magnetism, and can attract magnetic steel 102 with magnetism. The pushing channel 222 extends to the lower side of the magnetic attraction plate 26, and after the magnetic steel 102 and the steel column 101 are combined, the pushing assembly pushes the combined steel column 101 to the lower side of the magnetic attraction plate 26, because the magnetic attraction plate 26 has magnetism, the magnetic attraction plate 26 will attract the steel column 101 below the magnetic attraction plate 26, and the side of the steel column 101 having the magnetic steel 102 is tightly attached to and fixed on the lower surface of the magnetic attraction plate 26. The magnetic attraction driver 28 drives the magnetic attraction plate 26 to rotate upwards, the magnetic attraction plate 26 is turned over by 180 degrees, at this time, one end of the steel column 101, which is provided with a threaded hole, faces upwards to be connected with the mounting hole of the lamp panel 10, and the magnetic attraction column is assembled on the lamp panel 10 through a screw.

Further, fixing base 25 is provided with two, and two fixing bases 25 are all fixed in the outside of bottom plate 21, and the certain distance of interval between two fixing bases 25, and board 26 is inhaled to magnetism is located between two fixing bases 25 promptly. The two fixed seats 25 limit the output shaft of the motor to keep axial rotation so as to prevent position deviation.

The pushing assembly comprises an air cylinder 241, a push rod arranged on the air cylinder 241 and a push plate 242 arranged at the end of the push rod, the air cylinder 241 drives the push rod to extend outwards or contract inwards, the push plate 242 moves correspondingly, and the steel column 101 is pushed to move along the pushing channel 222 through the push plate 242.

In one embodiment, the robot unit 5 will be specifically described. The manipulator unit 5 comprises a multi-axis mechanical arm 53, the multi-axis mechanical arm 53 can move in multiple directions at multiple angles, the screw screwing assemblies 51 and the carrying assemblies 52 are arranged at the ends of the multi-axis mechanical arm 53, and the multi-axis mechanical arm 53 drives the screw screwing assemblies 51 and the carrying assemblies 52 to move. The screwing assembly 51 comprises an automatic screwdriver, which may be a commonly used robotic screwing device, such as a power screwdriver, which magnetically attracts the screw and drives it in rotation to perform the screwing action. A material tank 50 for loading screws is arranged on one side of the multi-axis mechanical arm 53, the multi-axis mechanical arm 53 drives the automatic screwdriver to move to the material tank 50, the automatic screwdriver adsorbs the screws from the material tank 50, the multi-axis mechanical arm 53 moves the automatic screwdriver adsorbed with the screws to the upper side of the mounting hole, the screws on the automatic screwdriver are driven to be in butt joint with the mounting hole, the electric screwdriver starts to twist the screws, the screws are installed in the mounting hole and the threaded holes of the steel column 101, and the assembly is completed by the magnetic attraction of the columns.

In one embodiment, the carrying assembly 52 includes a fixed plate, two jaws disposed at two ends of the fixed plate for clamping the lamp panel 10 or releasing the lamp panel 10, and a jaw driver for driving the two jaws to clamp or release the lamp panel 10, and the multi-axis robot 53 is used to move the lamp panel 10 to different stations.

In an embodiment, the intelligent assembling machine for the magnetic poles of the LED lamp panels further comprises a material moving unit 6, wherein the carrying assembly 52 is used for moving the assembled lamp panel 10 to the material moving unit 6 from the placing tray, and the material moving unit 6 is used for conveying the assembled lamp panel 10 to the next station or dropping the assembled lamp panel into the material receiving box.

As shown in fig. 2, the material moving unit 6 and the transportation unit 4 may adopt the same transportation structure, and both include a bracket 41 and a transportation roller 42 disposed on the bracket 41, the transportation roller 42 is connected with a corresponding driver, and the driver drives the transportation roller 42 to rotate, so as to drive the lamp panel 10 to move.

In an embodiment, place the surface of dish and be provided with the protrusion in place the dish surface and with place the chuck 31 of dish coaxial setting, the diameter of chuck 31 is less than the internal diameter of lamp panel 10, and the diameter of placing the dish is less than the external diameter of lamp panel, and lamp panel 10 both can place on placing the dish like this, and simultaneously, middle chuck 31 plays limiting displacement, prevents that lamp panel 10 from taking place lateral displacement on placing the dish, guarantees to assemble accurate counterpoint.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.

Claims

1. The utility model provides a post intelligence assembly machine is inhaled to LED lamp plate magnetism which characterized in that: the device comprises a vibration disc, a magnetic steel conveying unit, a combination unit, a placing unit, a conveying unit and a manipulator unit; the placing unit comprises a placing disc and a rotary driving assembly for driving the placing disc to rotate; the transportation unit is used for conveying the lamp panel to be provided with the magnetic attraction pole to the placing panel; the vibration disc is used for conveying the steel column to be assembled to the combination unit; the magnetic steel conveying unit is used for conveying magnetic steel to be assembled to the combination unit; the combined unit comprises a combined assembly and a butt joint assembly, the combined assembly is used for combining the magnetic steel and the steel column, and the butt joint assembly is used for moving the combined steel column to the position below the lamp panel and connecting the threaded hole of the steel column with the mounting hole reserved on the lamp panel; the manipulator unit comprises a screw screwing assembly and a carrying assembly, the screw screwing assembly is used for screwing screws into the threaded holes and the mounting holes, and the carrying assembly is used for moving the lamp panel out of the placing panel.

2. The intelligent assembling machine for the magnetic attraction columns of the LED lamp panel according to claim 1, is characterized in that: the combined assembly comprises a feeding channel butted with the vibrating disc and a pushing channel communicated with the feeding channel, wherein one end of the pushing channel is provided with a pushing assembly, a blanking block is arranged above the other end of the pushing channel, the top of the blanking block is provided with an adsorption hole communicated with the pushing channel, and the adsorption hole is butted with the magnetic steel conveying unit; the pushing assembly is used for pushing the steel column in the pushing channel to the position below the blanking block.

3. The intelligent assembling machine for the magnetic attraction columns of the LED lamp panel according to claim 2, is characterized in that: butt joint subassembly is including the fixing base that is located the blanking piece outside, rotate the magnetism board of being connected and set up the magnetism driver of inhaling on the fixing base with the fixing base, magnetism is inhaled the driver and is used for the drive magnetism is inhaled the board and is rotated, it extends to push away the material passageway magnetism and inhale the below of board, and pushes away the material subassembly and be used for promoting the steel column of having combined to the below of inhaling the board, magnetism is inhaled the steel column that the board is used for adsorbing its below.

4. The intelligent assembling machine for the LED lamp panel magnetic attraction columns of claim 3 is characterized in that: the fixing seats are two, and the magnetic suction plate is located between the two fixing seats.

5. The intelligent assembling machine for the magnetic attraction columns of the LED lamp panel according to claim 2, is characterized in that: the material pushing assembly comprises an air cylinder, a push rod and a push plate arranged at the end part of the push rod.

6. The intelligent assembling machine for the LED lamp panel magnetic suction columns according to any one of claims 1 to 5, is characterized in that: the manipulator unit comprises a multi-axis mechanical arm, the screw screwing assembly and the carrying assembly are arranged on the multi-axis mechanical arm, and the screw screwing assembly comprises an automatic screwdriver; and one side of the multi-axis mechanical arm is provided with a material box for loading screws, and the multi-axis mechanical arm is used for driving the automatic screwdriver to adsorb the screws from the material box and driving the screws on the automatic screwdriver to be in butt joint with the mounting holes.

7. The intelligent assembling machine for the LED lamp panel magnetic attraction columns of claim 6 is characterized in that: the carrying assembly comprises a fixed plate, two clamping jaws arranged at two ends of the fixed plate and a clamping jaw driver for driving the two clamping jaws to clamp or release.

8. The intelligent assembling machine for the LED lamp panel magnetic suction columns according to any one of claims 1 to 5, is characterized in that: the intelligent assembling machine for the LED lamp panel magnetic attraction columns further comprises a material moving unit, the carrying assembly is used for moving the assembled lamp panel to the material moving unit from the placing disc, and the material moving unit is used for conveying the assembled lamp panel.

9. The intelligent assembling machine for the LED lamp panel magnetic attraction columns of claim 8, is characterized in that: the transportation unit and the material moving unit both comprise a support and a transportation roller arranged on the support.

10. The intelligent assembling machine for the LED lamp panel magnetic suction columns according to any one of claims 1 to 5, is characterized in that: the surface of placing the dish is provided with the protrusion in place the dish surface and with place the coaxial chuck that sets up of dish, the diameter of chuck is less than the internal diameter of lamp panel, the diameter of placing the dish is less than the external diameter of lamp panel.